131results about How to "Small standing wave" patented technology

The invention relates to a radio frequency power supply, in particular to a large-power full solid-state radio frequency power supply based on an MOS-FET amplifier, which comprises a signal source, a control circuit, a modulation switch, a wave filter, a primary power amplification circuit, a secondary power amplification power, a synthetic wave filter, a power detector and other modules; and the radio frequency power supply has the advantages that the radio frequency power supply has long service life, long continuous working time, stable power frequency and power and simple operation, does not need preheating, reduces the labor intensity of engineering operators, has high efficiency of the whole machine and also has the functions of standing wave protection and overheating protection.

The present invention relates to a waveguide-type W wave band circularly polarized horn antenna which is mainly used in the fields, such as millimeter wave communication, millimeter wave detection, remote sensing, remote measurement, etc. The waveguide-type W wave band circularly polarized horn antenna comprises a circular waveguide radiator, an output impedance matching waveguide, a circular waveguide polarizer, an input impedance matching waveguide, a rectangular- circular transition waveguide and a rectangular waveguide which are connected orderly. According to the present invention, by designing the circular waveguide polarizer, the circular polarization characteristic of an electromagnetic wave is realize; by designing the output impedance matching waveguide and the input impedance matching waveguide, the good impedance matching is realized, and the standing-wave ratio of the antenna is reduced; by designing a horn radiation structure, the antenna gain is improved.

The invention relates to an ultrasonic sterilizing and algae removing method for an industrial circulating cooling water system. The method is characterized by arranging a frequency mixing ultrasonic irradiation device on the outer wall of a circulating water conveying pipeline or immersing the frequency mixing ultrasonic irradiation device in a water storage tank and irradiating the industrial circulating cooling water to obtain the circulating cooling water which is subjected to sterilization and algae removal, wherein the frequency mixing ultrasonic irradiation device consists of a high frequency ultrasonic generator, a low frequency ultrasonic generator and ultrasonic transducers. The method provided by the invention can strengthen the single frequency ultrasonic sterilizing effect, can effectively inhibit the growth of fungus and algae in the system without germicide, has good effects of sterilizing and removing algae, has simple and easy operation, reduces the treatment energy consumption and is green and environment-friendly.

The invention discloses a multimode wide-band filter based on a multi-branch loaded square resonance ring, which mainly solves the problem that the circuit size of a conventional multimode wide-band filter is limited by the area of the resonance ring. The filter comprises a micro-band dielectric substrate (1), a metal grounding plate (2), a square resonance ring (3) and a pair of input and output feed lines (8). The square resonance ring (3) comprises a square metal ring (4), a pair of equilong perturbation branches (5), a pair of impedance matching metal pieces (6), and a pair of transmission zero point branches (7). The two equilong perturbation branches (5) are located at a pair of external opposite angles of the square metal ring (4). The two same impedance matching metal pieces (6) are located at the other pair of opposite angles of the metal ring (4). The transmission zero branches (7) and the equilong perturbation branches (5) are connected in parallel or located in the metal ring (4) and are connected with the inner edge of the metal ring (4). The pair of input and output feed lines (8) is symmetrically arranged above the micro-band dielectric substrate (1) horizontally, and is parallel to the tail ends of the perturbation branches. According to the multimode wide-band filter, the circuit size of the filter is reduced, and the circuit is miniature, and the filter can be applied to wireless communication systems.

The invention discloses a coaxial S / X dual-frequency sharing feed source network. The coaxial S / X dual-frequency sharing feed source network comprises a coaxial horn feed source, wherein the coaxial horn feed source is composed of an S-frequency-band horn and an X-frequency-band horn, the S-frequency-band horn is externally connected with an S-frequency-band feed network, and the X-frequency-band horn is externally connected with an X-frequency-band feed network, arranged in the S-frequency-band horn in a sleeved mode and coaxial with the S-frequency-band horn. Four transmission arms distributed in the form of a cross and used for achieving S-frequency-band signal wave separating are arranged at the bottom of the S-frequency-band horn, and inner cavities of the four transmission arms are communicated with the inner cavity of the S-frequency-band horn. The coaxial S / X dual-frequency sharing feed source network achieves S-frequency-band single-pulse tracking and circular polarization signal receiving and sending and X-frequency-band single-pulse tracking and circular polarization signal receiving, has the advantages of being wide in working band, small in standing wave, large in power capacity, small in consumption, low in sidelobe, good in directional diagram equalization, small in axial ratio and the like and is suitable for a double-reflection-face multi-frequency multi-tracking-satellite communication and control antenna with the length larger than 7.3 m.

The invention discloses a radio-frequency circuit and a method for reducing harmonic interference of the radio-frequency circuit. The circuit comprises a radio-frequency transceiving module, a matching module, a shunt switch and a filter module; one end of the matching module is connected with the radio-frequency transceiving module, and the other end is connected with the filter module via the shunt switch. The method comprises the following steps: S10, detecting the frequency of signals; and S20, selecting a signal channel according to the frequency detection result of the signals. The radio-frequency circuit can recognize signals and transmit the signals in different channels, and can further filter more harmonic interference generated therein, thus greatly reducing harmonic power no matter on conduction or coupling, and solving the problem of electromagnetic compatibility stray.

A central symmetric horizontally-polarized broadband omnibearing array antenna comprises a round dielectric plate, wherein a power division feed network is arranged on a surface of the round dielectric plate, a common disc metal ground is arranged on the other surface of the round dielectric plate and outwards extends to form a circular metal foil, the circular metal foil is uniformly partitioned into four circular arc printing dipoles by a first radial gap, a second radial gap, a third radial gap and a fourth radial gap which are arranged on the circular metal foil, a radial intermediate gap is formed on each circular arc printing dipole and arranged on a radial symmetric central line of the circular arc printing dipole, a radial rectangular coupling branch is arranged in each radial gap, arc gaps are connected to the inner side ends of the radial gaps, all arc gaps are concylic by taking the center of the common disc metal ground as a circle center, an arc guide branch is arranged on the outer side of each radial gap, and all arc guide branches are arranged on a circumference taking the center of the common disc metal ground as the circle center.

The invention discloses a semi-flexible radio-frequency coaxial cable assembly and a manufacturing method therefor, and relates to the technical field of a radio-frequency coaxial cable. The coaxial cable assembly comprises a connector and the coaxial cable, wherein the inner conductor of the coaxial cable is inserted into the connector; a chamfer is arranged at the end of the inner conductor; the manufacturing method for the coaxial cable comprises the following steps of cutting a cable, removing an insulating protection sleeve on the end part of the cable, an outer conductor shielding layer and an insulating medium to expose the inner conductor; trimming the outer conductor shielding layer and the insulating medium; cutting the inner conductor and making the chamfer on the inner conductor; performing tinning on the inner conductor after the inner conductor is subjected to chamfer processing; enabling the inner conductor to be inserted in the welding cavity of the interface inserting pin of the connector, and enabling the inner conductor and the interface inserting pin to be welded together; enabling the outer conductor shielding layer to be inserted into the interface tail pipe of the connector; enabling the outer conductor shielding layer and the tail pipe of the connector to be welded together; and testing the welded cable assembly. By adoption of the technical scheme, the requirements of low insertion loss, low standing wave and equivalent phase of scientific research production on the cable assembly can be well satisfied.

The invention relates to a high-reliability K-type radiofrequency coaxial terminal load. The high-reliability K-type radiofrequency coaxial terminal load is a precision microwave passive device capable of realizing terminal impedance matching of microwave signal transmission paths and completely absorbing transmission energy of coaxial lines. The high-reliability K-type radiofrequency coaxial terminal load comprises a connecting nut, a washer, a snap spring, an insulating support assembly, a shell, four metal foil resistors, soldering tin, a gland and the like which are assembled. Microwave signals with frequencies ranging from low frequencies to 40GHz high frequencies can be received, most of the signals are absorbed, accordingly impendence matching of the signals is guaranteed, and signal leakage at idle ports and mutual interference among systems are greatly reduced. Compared with the traditional K-type load, the high-reliability K-type radiofrequency coaxial terminal load has the advantages that the high-reliability K-type radiofrequency coaxial terminal load is novel in structure, high in reliability, broad in frequency band, excellent in performance and wide in application prospect and is ultra-small, the quantity of standing waves is low, and the like.

The invention discloses a phase-regulated cable for spaceflights and a method for preparing the same. The phase-regulated cable for spaceflights is characterized by comprising an inner conductor, an insulation layer, outer conductors and sheaths which are all coaxially and are sequentially arranged from inside to outside. The method for preparing the phase-regulated cable for spaceflights comprises the following steps of forming the inner conductor by drawing or twisting a single or multiple silver-plated copper wires; forming the insulation layer by using a lapping production line to manufacture a polytetrafluoroethylene micro-porous thin film and then pressing the thin film; forming an outer conductor I by using the lapping production line to lap a silver-plated copper flat belt and then rolling the flat belt with round rollers; forming an outer conductor II by lapping an aluminum foil and a polyimide composite belt; forming an outer conductor II by braiding copper-plated round copper wires; and forming a sheath I and a sheath II by using the lapping production line to lap a polyimide duplex polytetrafluoroethylene thin film and a polytetrafluoroethylene sealing tape; and thus obtaining a finished product of a phase-regulated cable. The phase-regulated cable for spaceflights small in laying bending radius, phase-regulated, low in loss and low in standing wave, and has strong resistance to high and low temperatures and radiation, improved anti-interference performance and good flame resistance.

The invention discloses a transverse electromagnetic wave cell impedance matching method and device which are capable of meeting the requirement of small standing waves in a total TEM cell working frequency band range. The device comprises an inner conductor and an outer conductor, wherein the bus shape of the inner conductor and / or the bus shape of the outer conductor is an index gradual change line with a gradient. The method provided by the invention comprises the following steps of: establishing an impedance matching structure parameterization model; setting boundary conditions and material parameters of the impedance matching device, adjusting gradients of the inner and outer conductors, index coefficients and the distance between discontinuous surfaces of the inner and outer conductor, carrying out simulation calculation on an electromagnetic field, and using a parameter S as an optimization target until optimal coefficients and an optimal distance are obtained. According to the invention, echoes of electromagnetic waves transmitted in a TEM cell are fewer, the energy loss is small, and the standing waves in the working frequency band range are smaller than 1.2.

The present invention provides a positive resist composition wherein at least a polymer included in a base resin has a repeating unit with an acid labile group having absorption at the 248 nm wavelength light and the repeating unit is included with a ratio of 1 - 10 % of all repeating units of polymers included in the base resin. There can be provided a positive resist composition with equal or higher sensitivity and resolution than those of conventional positive resist compositions, and in particular, by which a pattern profile on a substrate with high reflectivity is excellent and generation of a standing wave and line edge roughness are reduced.

The present invention relates to the field of electronic communication and microwave technology and particularly relates to a microstrip device test system. The system comprises a bracket base, a clamp and a vector network analyzer. The inner conductor of the coaxial cable of the vector network analyzer is provided with a 1m depth groove for placing a stripline. According to the clamp, the stripline is placed in a fixed device and is connected to the bracket base and the coaxial cable through the fixed device. The bracket base is formed by a fixed base and a height adjusting base. The transfer mode is that the inner conductor of the stripline extends out for 1mm and is inserted into groove on the coaxial line inner conductor of the vector network analyzer, and the inner conductor of the stripline extends out for 1mm and is put to a microstrip line conduction band. The test system has the advantages that the system is applicable to various sizes of devices of a 50ohm microstrip line interface, and the test system has the advantages of small insertion loss, a small standing wave, and accurate test result.

The invention discloses a micro wave high-frequency-band small base station plate antenna, which comprises two layers of microwave medium substrates, cut-angle square main radiation metal patches, two groups of compact tree shape equal-power distribution networks and square spurious radiation metal patches, wherein the cut-angle square main radiation metal patches are printed at the front side of the lower layer medium substrate and are distributed in two rows and eight lines; the two groups of compact tree shape equal-power distribution networks is in dual polarization correspondence to + / -45 degrees; the square spurious radiation metal patches are printed on the upper layer medium substrate, are strictly aligned with the main radiation metal patches and are distributed in two rows and eight lines; the two groups of equal-power distribution networks are one-to-16-path networks; the tail ends of 16 branches of the one-to-16-path networks are in one-to-one connection with the main radiation metal patches and shown orthogonal feeding state; a main feeding port uses a pair of SMA type coaxial joints for connection. The micro wave high-frequency-band small base station plate antenna has the advantages that a complete printed circuit process is used; the dual polarization small base station plate antenna with low profile, small standing waves, low mutual coupling, low front-to-back ratio and high efficiency is realized by the design; the antenna is applicable to the potential application requirements of small base station building of fifth generation mobile communication at microwave high frequency band. The 3dB wave beam of the antenna is 30 degrees *7 degrees; 12 pieces of antennas provided by the invention can be used for realizing the whole unit 360-degree continuous coverage.

The invention relates to an SMP (symmetrical multi-processing) radio frequency coaxial load which comprises a first external conductor, a first insulator, a first internal conductor, a second external conductor, a second insulator, a second internal conductor and a resistor, wherein the first internal conductor, the second internal conductor and the resistor are sequentially connected; the second external conductor is in threaded connection with the first external conductor; a clamping groove, a cylindrical mounting surface and a polygon prism-shaped anti-rotation flange are sequentially arranged on the outer side surface of the first external conductor from the end surface, and a slotted snap ring is arranged in the clamping groove; and a conical table extending to the second external conductor is arranged on the inner end surface of the first external conductor, and the second external conductor is provided with a conical hole matched with the position and the taper of the conical table. According to the SMP radio frequency coaxial load disclosed by the invention, the technical problems of inconvenience in disassembly and assembly and invariable impedance of the existing SMP radio frequency coaxial loads are solved, and the SMP radio frequency coaxial load has the advantages of being adjustable in impedance, convenient in installation or detachment and easy in implementation.

The invention discloses a method for extracting sinomenine hydrochloride from caulis sinomenii. The method comprises the following steps: crushing sinomenium acutum roots; sieving by a 40-mesh sieve; adding 5-8 times of a 60-70% ethanol liquid; extracting for 1-2 hours in a double frequency ultrasonic device; filtering and decompressing and concentrating; and purifying the filtrate by virtue of column chromatography on silica gel to obtain high purity sinomenine hydrochloride. The method disclosed by the invention is simple in process and high is recovery rate and the separated sinomenine hydrochloride is high in purity.

The invention provides a radiating unit which is used for overcoming the defects that a common radiating body is low in intermodulation and high in cost and further provides a broadband high-intermodulation omni-directional ceiling antenna with the radiating unit, and the high-intermodulation performance of the omni-directional ceiling antenna is achieved. The radiating unit is a rotary shell body which is formed by metal materials in an integrated mode. The rotary shell body is sequentially composed of an arc part, a cylinder part and a cone part. The conical degree of the cone part is 4:1-2:1, the diameter of the bottom face is 80mm-130mm, the height of the cylinder part is 25mm-75mm, and the radius of curvature of the arc part is 15mm-35mm. The radiating unit has the advantages of being easy to process, low in cost and capable of achieving the high-intermodulation requirement and the like. The broadband high-intermodulation omni-directional ceiling antenna has the advantages of being wide in a frequency band, low in a standing wave, large in half radiation lobe width, high in gain and the like. The requirement for the long term evolution (LTE) by indoor broadband covering is met, and the purpose of mass production is achieved.

The invention discloses an integrated cavity band-pass filter and low-pass filter assembly, and belongs to the field of microwave devices. The assembly is formed by connecting a cavity band-pass filter and a cavity low-pass filter, wherein the cavity band-pass filter and the cavity low-pass filter are integrally connected and combined into a whole; the band-pass filter and the cavity low-pass filter are in matched connection through an inner conductor in the cavity low-pass filter; the inner conductor of the cavity low-pass filter is fixedly connected with a metal resonance column of the cavity band-pass filter; the cavity low-pass filter is a candied fruit filter; the cavity band-pass filter is a toe or comb filter; and the cavity low-pass filter and the band-pass filter are coaxial filters and are multi-order filters. According to the integrated cavity band-pass filter and low-pass filter assembly, mainly aiming at the cavity band-pass filter and the cavity low-pass filter, integration of the low-pass filter and the band-pass filter is achieved in a manner of fixedly connecting the inner conductor in the cavity low-pass filter and the metal resonance column in the cavity band-pass filter; the size of the device is reduced; the method is simple; and the requirement of high harmonic suppression of the filters is achieved.

The invention provides a novel ceiling antenna with low cost and convenient debugging process, comprising a cover plate, a shell and a radiator, wherein the radiator is arranged below the cover plate; the shell is arranged below the cover plate and contains the radiator therein; the radiator comprises an upper conical vibrator, a lower conical vibrator, a spacer, a coaxial cable and a coupling vibrator; the upper conical vibrator is a hollow structure die-stamped by aluminium alloy; the top of the upper conical vibrator is provided with a spreading part which extends horizontally; the upper conical vibrator is inverted and arranged below the cover plate by the spreading part; the lower conical vibrator is a hollow structure die-stamped by the aluminium alloy; the top of the lower conical vibrator and the bottom of the upper conical vibrator are arranged intermittently at the distance of 3-15mm by the spacer; the external conductor and the internal conductor of the coaxial cable are connected with the upper conical vibrator and the lower conical vibrator respectively; and the coupling vibrator is arranged between the external side wall of the upper conical vibrator and the external side wall of the lower conical vibrator.

The invention discloses a terminal antenna used in a wireless local area network. The terminal antenna comprises a radio frequency connector, a feeding cable, a suction cup base, a 2.4G band antenna,a 5G band antenna and a combiner. The left side of the suction cup base is provided with a mounting screw and is fixedly installed with the 2.4G band antenna, the right side of the suction cup base isprovided with a mounting screw and is fixedly installed with the 5G band antenna, the top portion of the suction cup base is provided with a mounting screw and is fixedly installed with the combiner,the combiner is internally provided with a frequency division unit circuit board, the frequency division unit circuit board is provided with a 2.4G band feed connection, a 2.4G band grounding connection, a 5G band feed connection and a 5G band grounding connection, and the 2.4G band antenna and the 5G band antenna are welded and fixed with the output end of the frequency division unit circuit board through respective connection cables. The volume is small, the weight is light, the anti-interference ability is strong, the frequency band is wide, the gain is high, and the radiation performanceindex is good.

The invention provides a micro-wave linear analog phase modulator at an X frequency range, which is characterized in that output ends of two paths of a Lange bridge are respectively connected with a VCD (variable capacitance diode) by reflection matching circuits; microwave signals are divided into two paths of orthogonal signals with equal amplitude and 90-degree phase difference by the Lange bridge; the orthogonal signals are echoed by the VCD to form two paths of echoed signals with the same amplitude and phase by the reflection matching circuits; the two paths of echoed signals are returned to the Lange bridge by the reflection matching circuits, and are subjected to inverting offset at an input end of the Lange bridge in the mode of the same amplitude and opposite phases, thus the echoed signals do not exist at the input end; the echoed signals are subjected to in-phase superposition at an output end of the Lange bridge in the mode of the same amplitude and phase, thus the microwave signals can be transmitted in one direction from the input end of the Lange bridge to the output end of the Lange bridge; the junction capacitance of the VCD is changed with the change of a control voltage, thus the phases of the echoed signals are changed with the change of the control voltage, thereby realizing microwave linear phase modulation; and the echoed matching circuits can increase the phase variable quantity of the echoed signals of the VCD so as to increase the modulation depth.

The invention relates to the technical field of microstrip antennas, in particular to a low-profile GSM-LTE coplanar directional antenna. The low-profile GSM-LTE coplanar directional antenna comprises a metal reflecting plate, an LTE radiating element patch, an LTE radiating element parasitic patch, a GSM radiating element patch, an LTE radiating element feed structure and a GSM radiating element feed structure. According to the low-profile GSM-LTE coplanar directional antenna, the LTE radiating element patch, the LTE radiating element parasitic patch and the GSM radiating element patch are arranged on the metal reflecting plate in a coplanar manner. The low-profile GSM-LTE coplanar directional antenna is in directional radiation, simultaneously supports a GSM band and an LTE band, has a low profile and a simple structure when obtaining a wide working band, is directly fed by a coaxial feeder line; a complicated feed network is omitted; and design and installation are facilitated.

The invention discloses a truncated-cone matching coaxial waveguide orthogonal mode coupler, and belongs to the technical field of wireless communication. The coupler comprises a turnstile connector and two groups of power synthesis / distribution pipe, wherein an impedance matching structure of the turnstile connector is a metal circular truncated cone structure located at the tail end of an internal conductor of a coaxial waveguide structure. The metal circular truncated cone structure and the coaxial waveguide structure are coaxial, and the diameter of the top surface of the metal circular truncated cone structure is greater than the diameter of the internal conductor metal of the coaxial waveguide structure. The bottom surface of the metal circular truncated cone structure is connected with the bottom surfaces of four rectangular coupling waveguides. The coupler is excellent in electrical performances, is simple in processing, can achieve the constant-phase polarization separation inabout one frequency multiplication, is excellent in standing waves, isolation and plug loss, can be used for a three-band antenna system (L / S / C, C / X / Ku, K / Ka / Q), and is the important improvement of the prior art.

The invention discloses a broadband collinear slot waveguide slot antenna, and belongs to the technical field of microwave antennas. The antenna comprises a waveguide coaxial converter, a one-to-two feed waveguide and a radiation waveguide. The one-to-two feed waveguide and the radiation waveguide are symmetrically nested and combined and are separated by a common common wall; the waveguide coaxial converter is located in the center of the lower side of the one-to-two feed waveguide, and isolation walls are arranged at the two ends of the one-to-two feed waveguide and the radiation waveguide and the joint of the radiation waveguide and the waveguide coaxial converter and used for forming a closed waveguide cavity. A plurality of radiation slots are formed in the top of the radiation waveguide along the center line of the wide edge direction, the radiation slots are located on the same straight line, and disturbance blocks which are distributed alternately are arranged in a waveguide cavity of the wave radiation waveguide near the radiation slots. The broadband collinear slot waveguide slot antenna provided by the invention is wide in working bandwidth, good in cross polarization performance and not easy to generate parasitic side lobes.

The invention relates to the technical field of probe cards, and discloses a micro coaxial radio frequency probe card, which is characterized in that a radio frequency probe is embedded in an isolation plastic sleeve, the isolation plastic sleeve is embedded in a grounding copper sleeve, and a second through hole matched with the radio frequency probe is concavely formed in the front end part of a probe shielding grounding head; the front end portion of the radio frequency probe is provided with a needle point which is of a cone-shaped structure, the needle point extends out of the second through hole, the two sides of the front end wall of the probe shielding grounding head are respectively provided with a shielding grounding needle which inclines inwards in a protruding mode, the needle point is arranged on the inner side of the shielding grounding needle, and the lower end portion of the coaxial radio frequency connector is provided with an insertion core. The lower end part of the bolt is provided with a second plug hole matched with the radio frequency probe, and the upper end part of the radio frequency probe is detachably embedded in the second plug hole, so that the shielding effect and the performance stability of the radio frequency probe are effectively improved, and the radio frequency probe card has the advantages of simple structure, low manufacturing cost, small insertion loss, low standing wave, stable performance and the like.

This publication discloses a harbour plant (10) for storage, loading and unloading of hydrocarbon products at sea, comprising a number of units (9) being mutually placed on the seabed so that a harbour plant is formed. The units (9) are placed independently at a given distance apart in sideways direction and having a front surface along which a vessel is intended to be moored, forming passage(s) for parts of the waves, and being configured to dampen a part of the incoming waves while allowing other parts of the waves and current to pass through the harbour plant. The sideways distances between two neighbouring units (9) is governed by the frequency of the waves to be dampened and the frequencies of the waves allowed to pass in between the units (9). The front surface of one of the units (9) is offset with a distance relative to the front surfaces of two neighbouring in a traverse direction away from said incoming waves, and / or that the units are configured in such way that the width of the passage between two neighbouring units increases or decreases in direction of the wave motion.

The invention discloses a high-power coaxial fixed attenuator which mainly comprises an SMA (shape memory alloy) female joint, an SMA male joint and an attenuator cavity. The cavity comprises radiators, two core cavities, two attenuation slices, ground clamps and a connector; the male joint comprises a swivel nut, a clamp ring, a male shell, an insulator, a male inner conductor, a spring and a contact cap; the female joint comprises a female shell, a female inner conductor, an insulator, a spring and a contact cap; and the connector comprises a connector inner conductor, a connector shell, an insulator, a spring and a contact cap. Metal oxide is used as a substrate, and an advanced resistance technology is adopted, so that the high-power coaxial fixed attenuator is high in the power density and stable in resistance. Besides, owing to the optimally designed card-shaped attenuation slices, requirements on small standing waves and wide frequency band are met. In addition, the working frequency of the product ranges from frequency of direct current to 26.5GHz, the power capacity of the attenuator is 50W, and the high-power coaxial fixed attenuator has good and quick radiating ability and is high in burning resistance and good in mechanical stability and repeatability.

The invention discloses a T-shaped port planar integrated waveguide circulator, belonging to the technical field of microwave and millimeter wave devices. The circulator is manufactured by integrally processing a medium material with deposited metal layers on two faces, and comprises a regularly-triangular medium cavity, a three-segment planar integrated waveguide and a center junction gyromagnetic ferrite, wherein the three-segment planar integrated waveguide comprises a two sections of arc lines and a section of linear planar integrated waveguide; the three ports of the circulator have T-shaped structures; and the center junction gyromagnetic ferrite is positioned at the center of the regularly-triangular medium cavity. The circulator provided by the invention has a T-shaped port structure, and a larger chip area for increasing the transition connection between a micro-strip and the integrated waveguide is not required to be sacrificed, so that the miniaturization and integration level of the entire device are further improved; and simultaneously, the circulator has the characteristics of high isolating performance, low insertion loss and small port standing wave, and can meet the application requirements of a miniaturized and integrated microwave / millimeter wave communication system.

The invention provides a three-channel integrated short-wave receiving antenna, belonging to the field of receiving short-wave frequency band signals and comprising a whip antenna, a first loop antenna, a second loop antenna, an upper cavity, a lower cavity, a base and an earth screen, wherein the whip antenna is internally provided with a whip antenna core which is welded with a connecting metal base at the lower part; the connecting metal base is in threaded connection with a socket core and connected with an input end of a whip antenna amplifier through the lower cavity; an output end of the whip antenna amplifier is connected with an RF (radio frequency) connector by a guide line; the first loop antenna is internally provided with a loop antenna core which is connected to an input end of a first loop antenna amplifier by an outgoing line; the second loop antenna is internally provided with a loop antenna core which is connected with an input end of the second loop antenna amplifier by an outgoing line; and the second loop antenna is fixed with the first loop antenna crosswise by the upper cavity and the lower cavity. The three-channel integrated short-wave receiving antenna is suitable for vehicle-mounted and portable equipment and reaches preferable receptivity and channel number in the smaller space.