179 results about "Microstrip filter" patented technology

The invention discloses a source end coupling microstrip filter which comprises a T-shaped resonator, an input coupling feed line, an output coupling feed line and an interfinger coupling line, wherein the T-shaped resonator is provided with two open-circuit branch sections and a short-circuit branch section, the two open-circuit branch sections form both sides of a U-shaped microstrip line, the short-circuit branch section is arranged at the bottom end of the U-shaped microstrip line, the short-circuit end of the short-circuit branch section is provided with a grounding through hole, and thesum of the lengths of the two open-circuit branch sections and the short-circuit branch section is a one half wavelength; the input coupling feed line and the output coupling feed line are coupled with the open-circuit branch sections at the inner sides of the open-circuit branch sections of the T-shaped resonator; and the interfinger coupling line is positioned in the T-shaped resonator and is arranged between the input coupling feed line and the output coupling feed line. The invention is provided with a plurality of controllable transmission zero points and has the advantages of flexible design, small volume, small insertion loss and the like.

This invention relates to a super broad band plane micro-strip filter including: a front part, a rear part and an input / output port, in which, the front part includes: interdigital capacitor units, a uniform transmission line and a medium plate, the two interdigital units are set at both ends of the medium plate, the unform transmission line is set at the middle of the medium plate, the input / output port has two ports connected with the capacitors, the rear part includes: a non-uniform DGS unit, a slot structure unit and an earth unit, the non-uniform DGS unit includes 7 arrayed non-uniformly in an approximate equidifferent sequence, the slot structure has three sets loaded at both sides of the even DGS unit, which applies front and rear circuit structure to realize high pass and low pass filters and reduce areas of circuits.

The invention discloses a double-band-pass microstrip filter which comprises a group of first sub microstrip filters and a group of second sub microstrip filters with different structures, as well as first signal transmission lines and second signal transmission lines, wherein the first signal transmission lines are respectively connected with the first sub microstrip filters and the second sub microstrip filters and are respectively connected with signal input ends; the second signal transmission lines are respectively connected with the first sub microstrip filters and the second sub microstrip filters and are respectively connected with signal output ends, thus the first sub microstrip filters and the second sub microstrip filters are connected in parallel. The centre frequencies, the band widths and in-strip characteristics of two pass bands of the double-band-pass microstrip filter can be regulated individually, thus the smaller stop band width between the two pass bands can be met by the microstrip filter disclosed by the invention.

The invention discloses a radio frequency front-end frequency selection circuit and a signal receiving method thereof. The circuit comprises: an antenna used for coupling and receiving a radio frequency signal; a first multipath switch used for selecting the radio frequency signal to a microstrip filter of a corresponding frequency band; the microstrip filter used for filtering an out-of-band interference signal; a low noise amplifier used for amplifying the useful radio frequency signal; and a filter group used for filtering the amplified signal; a second multipath switch used for switching the radio frequency signal obtained by the filter group to a subsequent link of a receiver to be processed. The method comprises the steps that: the radio frequency signal is coupled to a radio frequency link by the antenna, the first multipath switch switches the radio frequency signal to the microstrip filter of the corresponding frequency band, the microstrip filter filters the out-of-band interference signal and amplifies and filters the useful signal for the second time, and finally the signal is switched to the subsequent link of the receiver to be processed. The radio frequency front-end frequency selection circuit disclosed by the invention has the advantages of miniaturization, integration and strong expansibility.

The invention relates to a microwave device ceramic substrate material and a preparation method thereof, and belongs to the technical field of electronic materials. The microwave device ceramic substrate material comprises a main crystal phase and a modified additive, wherein the chemical general formula of the main crystal phase is Mg(1+x)CoyTiO(3+x+y), x is more than 0.01 and less than 0.05, y is more than 0.001 and less than 0.01, the modified additive is one or a plurality of materials selected from CeO2, Nb2O5, Nd2O3, ZnO, MnCO3 and SiO2, and the mass of the modified additive is 0.0-4.0%of the total mass of the whole microwave device ceramic substrate material. The preparation method comprises processes of material preparing, ball milling, pelletizing, forming and sintering. The microwave device ceramic substrate material has characteristics of high Q*f value (80000-100000), medium dielectric constant (17-20) and serialization dielectric constant temperature coefficient (0-110),is applicable for preparations of the microwave device substrate materials, and can meet the preparation requirements of the microwave devices (especially the microstrip filter). The method of the present invention has characteristics of simpleness, easy control, environmental protection and low cost.

The invention provides a branch knot loading compact type microstrip filter. Metal circuits with left-right symmetrical patterns are arranged on a metal surface layer. The metal circuits comprise bent input-output ports which are left-right symmetrical and arranged in a Z shape, source end and load loading transmission lines and input-output couplers which are inwardsafter bending. The source end and the loading transmission lines are connected in a bending mode. The branch knot loading compact type microstrip filter further comprises a T-shaped opening circuit loading upper transmission line, a T-shaped opening circuit loading lower transmission line and left-right-parallel even transmission line resonance units of a downward bent structure. The T-shaped opening circuit loading upper transmission line and the T-shaped opening circuit loading lower transmission line are located at a middle position and of a cross-shaped crossing structure and arranged vertically. The branch knot loading compact type microstrip filter solves the problem that a traditional microstrip filter is large in size, low in stop band restrain level and high in loss.

The invention relates to a coupling method of a microstrip filter and a microstrip resonator thereof. The resonator comprises a group of finger-inserting capacitors comprising microstrips, a group of double-helix curved inductors and a group of blocky capacitors formed with ground, wherein the microstrip comprises an upper-layer superconducting film, a lower-layer superconducting film and an artificial monocrystal medium positioned between the upper-layer and the lower-layer superconducting films; the finger-inserting capacitors are connected in parallel with the double-helix curved inductors, and the finger-inserting capacitors and the double-helix curved inductors connected in parallel are serially connected with the blocky capacitors; a line in the finger-inserting capacitors of the first resonator, which has the same charge polarity with an outermost line of the finger-inserting capacitor of the second resonator is shortened or cut off completely; and the outermost line of the finger-inserting capacitors of the second resonator is elongated and bent, extends into a line shortened or cut off completely in the finger-inserting capacitors of the first resonator and is coupled with two adjacent lines in the finger-inserting capacitors of the first resonator. The filter has less insertion loss, large out-band rejection, high band-edge gradient and good group delay performance.

A high frequency filter design for the GHz frequency range is provided. The high frequency filter comprises at least a microstrip design that incorporates both transverse and lateral couplings between the filters resonators. The high frequency filter further incorporates an opened or fully enclosed enclosure over the strip line or microstrip circuitry and may be manufactured on a relatively thick dielectric substrate having a thickness that is greater than about a twentieth of the filter's band-pass wavelength in the dielectric substrate. The high frequency filter design provides a small, easily reproducible filter design better than prior art microstrip filters.

The invention relates to a differential microstrip filter antenna fed by a balun filter. The structure uses a balun filter to generate the differential signal with filtering characteristics, which excites the differential fed microstrip antenna, and realizes the miniaturized differential fed microstrip antenna with filtering and radiation characteristics at the same time. The filter antenna has stable gain in the pass band, fast gain drop out of the pass band and good edge selectivity. In addition, the radiation pattern of the structure is symmetrical and the cross polarization can achieve -35dB. on both the E plane and the H plane.

The present invention is one kind of symmetric double-spiral resonator and the band-pass filter therewith. The present invention features that the resonator consists of two linearly symmetric microstrip lines in spiral structure and connected into one integral, and the band-pass filter consists of input microstrip, output microstrip and resonator array comprising several double-spiral resonators. The filter of the present invention has the advantages of excellent frequency selectivity, high stop band suppression; and the resonator in symmetric double-spiral structure has reduced size, reduced coupling effect of non-adjacent resonators, and simplified circuit design and regulation. The present invention makes it possible to make traditional planar microstrip filter with common metal material and is suitable for making high temperature superconductive filter with high quality factor.

The invention provides a micro-strip filter with a novel defected ground structure. The micro-strip filter is produced by a printed circuit board, a first layer of the printed circuit board comprises a cross open-circuit micro-strip line with capacity effect, a second layer comprises a first defected ground unit and a second defected ground unit which have inductive effect, the first defected ground unit and the second defected ground unit are axially symmetrical along the longitudinal axis of the circuit board and comprise a first E-shaped slot and a second E-shaped slot respectively, openings of the first E-shaped slot and the second E-shaped slot are oppositely arranged and are axially symmetrical along the lateral axis of the circuit board, and the cross open-circuit micro-strip line of the first layer is relatively positioned between the two defected ground units of the second layer. The micro-strip filter with the novel defected ground structure has smaller size and a simpler structure, and has good performance on the working band.

The invention relates to a high temperature superconductive microstrip filter with a tap structure, which belongs to the field of microwave communication technology equipment. The microwave filter comprises an input feeder, an output feeder, and a plurality of sections of U type half wavelength resonators which are arranged in parallel, and is characterized in that: at least one section of half wavelength resonator is a resonator with the tap structure and is used for introducing a transmission zero into the passband edge of the filter. In the high temperature superconductive microstrip filter, the appropriate transmission zero is introduced by using the tap structure to make a transitional zone steep. The high temperature superconductive microstrip filter has the advantages of small overall size, low insertion loss, high out-of-band rejection and the like, is used for manufacturing a high temperature superconductive filter and is suitable for a plane type common metal microstrip filter.

The invention discloses a miniaturized high-performance microstrip filtering power divider based on a zero-order resonator. The microstrip filtering power divider is based on a left-right-hand transmission line structure, and consists of interdigital type capacitors and high-impedance line inductors. By virtue of the characteristics of the zero-order resonator, dimensions are independent of wavelengths, so that remarkable miniaturization is realized; compared with other microstrip filtering power divider, the area of the microstrip filtering power divider disclosed by the invention is reduced by at least 50%; the filtering power divider has excellent performance, and the passband loss is only minus 3.6dB, and a passband S11 is the best of disclosed filtering power dividers, which is lower than minus 20dB; and the isolation of second and third ports achieves at least minus 19dB, which is better than that of the disclosed filtering power dividers. The microstrip filtering power divider disclosed by the invention adopts a two-sided microwave dielectric plate, so that the microstrip filtering power divider is simple in structure, easy to process, low in cost, light in weight and capable of realizing large-scale production.

This invention refers to analog signal process and communication technology, especially refers to the group delay equalization of high temperature superconductive filter used in high temperature superconductive film technology field, which contains high temperature superconductive microstrip filter, 3db mixing coupler and two single end reflection filter, is a plane microstrip structure and adapts for making phase equalization and reducing phase distortion to the high temperature superconductive filter of RF front end in satellite receiving system and receiving front end in base station of mobile communication system. Said invention is integrated in one medium substrate and has more stable performance.

The invention discloses a microstrip filter with controllable transmission zeros. The lower surface of a dielectric substrate (1) of the microstrip filter is completely covered with a metal layer, and a first input and output feeder (21), a first short-circuit stub (31), a first resonator (41), a second short-circuit stub (32), a second resonator (42), a third short-circuit stub (33), a third resonator (43), a fourth short-circuit stub (34) and a second input and output feeder (22) of a metal layer of the upper surface of the dielectric substrate (1) are connected in sequence. The first resonator (41), the second resonator (42) and the third resonator (43) are formed by connecting three inverted-T-shaped microstrip lines, each resonator can generate one transmission zero, and the positions of the transmission zeros can be controlled according to the lengths of open-circuit stubs on the resonators. The microstrip filter has the advantages of being convenient to process and low in cost and weight; meanwhile, the number of the transmission zeros is large, the out-of-band rejection performance and frequency selectivity of the microstrip filter are improved, and the microstrip filter can be widely applied to wireless communication systems.

A high frequency filter design for the GHz frequency range is provided. The high frequency filter comprises at least a microstrip design that incorporates both transverse and lateral couplings between the filters resonators. The high frequency filter further incorporates an opened or fully enclosed enclosure over the strip line or microstrip circuitry and may be manufactured on a relatively thick dielectric substrate having a thickness that is greater than about a twentieth of the filter's band-pass wavelength in the dielectric substrate. The high frequency filter design provides a small, easily reproducible filter design better than prior art microstrip filters.

The invention discloses a harmonic inhibition power amplifier and belongs to the field of wireless emission. Input signals in the harmonic inhibition power amplifier, after passing through a first microstrip low-pass filter, enter a first-grade power amplifier, then, after passing a second microstrip low-pass filter, enter a second-grade power amplifier, and after being subjected to cluster filtering through a third microstrip low-pass filter, are output. Filter casuists and capacitors are added to a drain electrode feed end of the first-grade power amplifier, a control electrode feed end of the first-grade power amplifier, a drain electrode feed end of the second-grade power amplifier and a grid electrode feed end of the second-grade power amplifier. According to the invention, through microstrip low-pass filters connected in series between the power amplifiers of corresponding grades of the power amplifier provided by the invention, the share of harmonic components transmitted to a circuit of a next grade is reduced, and at the same time, the feed ends of two-stage power amplifiers, besides employing routine filter capacitor combinations, are also additionally provided with sector microstrip filtering branches of fundamental frequency, secondary harmonics and triple harmonics of dot frequency signals so as to reduce power of leakage of the fundamental frequency and the harmonics to a receiver end from a feed circuit.

A compact Ku band microwave diplexer configured as a three port surface mount component on a miniature alumina substrate. Input signals occurring at a common port having frequencies within a first pass band are passed to a second port while being isolated from signals occurring at a third port. Signals occurring at the third port are passed to the common port while being isolated from the signals at the second port. A microstrip dual spur line filter is used combined with open circuit stubs to provide enhanced second harmonic suppression on the transmit side, while using a coupled line microstrip filter on the receive side. This approach allows for compact size and automated component assembly through pick and place and reflow manufacturing techniques.

The invention relates to a miniaturized double-stopband microstrip filter, belonging to the technical field of microwave communication. The miniaturized double-stopband microstrip filter comprises a front surface part, a back surface part and an input / output port, wherein the front surface part consists of a microstrip conduction band and a T-shaped defect microstrip structure, and the back surface part consists of a ground plate unit and a U-shaped defect ground structure. The miniaturized double-stopband microstrip filter can be applied to suppression of double-frequency interference in a wireless communication system, and has the advantages of fully utilizing spaces of the microstrip conduction band and a ground unit, effectively reducing the areas of devices, thereby being beneficial to integration with other planar microwave circuits; simultaneously, the miniaturized double-stopband microstrip filter further has the characteristics of simple structure, free adjustability of double-stopband center frequency, easiness for implementation and the like.

The invention relates to an ultra-wideband microstrip filter which comprises a first metal layer. The metal pattern of the first metal layer comprises symmetrical left and right metal patterns, wherein the left and right metal patterns respectively comprise an input / output port, a first order stepped impedance circuit cut line, a second order stepped impedance circuit cut line and an interdigital coupling line section, and the input / output port, the first order stepped impedance circuit cut line, the second order stepped impedance circuit cut line and the interdigital coupling line section are connected in sequence. The first order stepped impedance circuit cut line, the second order stepped impedance circuit cut line and the interdigital coupling line section form a circular structure as a resonance unit of the filter. The interdigital coupling line section comprises a first sub-line section and a second sub-line section, wherein the first sub-line section and the second sub-line section are parallel to each other and are coupled with each other, the first sub-line section is connected with the tail end of the second order stepped impedance circuit cut line, and the second sub-line section is connected with the initial end of the first order stepped impedance circuit cut line. The intersection of the first and second order stepped impedance circuit cut lines is provided with a metalized through hole which penetrates through the first metal layer and a dielectric layer and forms a path together with a second metal layer.

The invention discloses a down-conversion system of multi-channel broadband. A four-channel broadband microstrip filter set, a mixing circuit and an intermediate frequency signal regulating circuit are integrated in the system, and the 4GHz-12GHz segmenting filtering and down-conversion function is completed. The high and low local oscillator combined frequency conversion mode is adopted for the down-conversion system, the intermediate frequency is 1.9214 GHz, 4GHz-12GHz radio frequency is input through the four channels to respectively perform pre-selection filtering on input signals, and mirror image interference is eliminated. Then, gating is performed through a microwave chip SP4T switch based on secondary packaging, the signals subjected to the gating are transmitted to the mixing circuit so that intermediate frequency signal can be obtained, and the signals are uniformly output after being regulated. In the segmenting switch switching mode, radio frequency signals are subjected to segmenting filtering, and interference of mirror image signals is reduced. The high and low local oscillator combined mode is adopted, namely, 5.9214-10.0786 GHz local oscillator signals are adopted, local oscillator resources are saved, and the 4-12 GHz mirror image suppression down-conversion function can be achieved under PXI single-groove size.

Methods and systems for filters embedded in an integrated circuit package are disclosed and may include controlling filtering of signals within an integrated circuit via one or more filter components embedded within a multi-layer package bonded to the integrated circuit. The one or more filter components may be electrically coupled to one or more switchable capacitors within the integrated circuit. The filter components may include transmission line devices, microstrip filters, transformers, surface mount devices, inductors, and / or coplanar waveguide filters. The filter components may be fabricated utilizing metal conductive layers and / or ferromagnetic layers deposited on and / or embedded within the multi-layer package. The integrated circuit may be electrically coupled to the multi-layer package utilizing a flip-chip bonding technique.

The microstrip filter is composed of input and output microstrips, first and last resonators of receiving direct excitation as well as multiple groups of hair clip type resonators with effective length in half wave length. In each group, number and direction of resonator are same, and directions are different between groups. Input and output microstrips in filter are connected to first and last resonators in filter directly. Couple between resonators is weak in same group since their directions are identical, and Couple between resonators in different groups is stronger. Thus, number of resonators is same group can be adjusted smartly in order to suite filter in different filters designed I different bandwidths. The invention is applicable to traditional plane type metal microstrip filer, also filter in high-temperature superconductor having high quality.

The invention discloses a microwave and millimeter wave large-frequency-ratio common-caliber antenna with high isolation. The antenna comprises a 4*4 substrate integrated waveguide back cavity slot array C, a substrate integrated waveguide power dividing feed network N and a low-frequency filtering feed network L. According to the invention, a millimeter wave antenna array and a microwave antenna are integrally designed, millimeter wave and microwave signals are radiated by using the same radiation structure, the aperture utilization rate is high, and miniaturization of a common-aperture antenna is realized; the high-pass characteristic of the substrate integrated waveguide structure is fully utilized, the two microstrip filtering structures are introduced at the same time, the polarization directions of the two antennas are perpendicular to each other, and high port isolation is obtained in the microwave working frequency band and the millimeter wave working frequency band; and the design of the large-frequency-ratio common-caliber antenna is generally complex, and compared with a traditional structure, the topological structure of the microwave and millimeter wave large-frequency-ratio common-caliber antenna is simple, so that the processing cost is lower, and the microwave and millimeter wave large-frequency-ratio common-caliber antenna is easier to implement.

The invention provides a Ca-Ti-based high-dielectric microwave ceramic substrate material, and a preparation method and an application thereof. The material is composed of two crystal phases, namely rutile type TiO2 and CaTiO3. A B-position substituted CaTiO3 phase is compounded with TiO2 to form a ceramic material with adjustable and controllable performances, other doping agents play roles in inhibiting Ti reduction and increasing the Q * f value of the ceramic material, and the general chemical formula of the material is Ca(BbTi1-b)O3 + aTiO2 + cZnO + dD. The preparation method comprises the following steps: burdening, ball-milling, granulating, forming and sintering. Results of laboratory research and test show that the Ca-Ti-based microwave ceramic substrate material prepared by the method has a high Q * f value (8000-12000), a high dielectric constant (145-165) and a serialized dielectric constant temperature coefficient (-1500 + / - 500). The composite ceramic is suitable for manufacturing substrate materials of microwave capacitors, and can also be used for manufacturing materials of adjustable microwave devices such as a microstrip filters.

The invention discloses a tunable microstrip filter and a design method of the tunable microstrip filter. The tunable microstrip filter comprises a plurality groups of parallel coupling lines. One end of each group of coupling lines is in short circuit, and the other end of each group of coupling lines is grounded after passing through a lumped capacitor, wherein the lumped capacitor is a voltage controlled variable capacitance diode. A manufacturing method of the tunable microstrip filter comprises the steps of normalizing a low-pass filter, searching a list for the order n of the filter to determine the normalization parameter of the normalized low-pass filter, working out the relevant parameter values of the filter according to the normalization parameter, working out the interval S and the width W of each group of parallel coupling lines of the microstrip filter by searching a list, and working out the length L of each group of parallel coupling lines. According to the tunable microstrip filter, the voltage controlled variable capacitance diode is used for replacing a common capacitor, the two ends of the voltage controlled variable capacitance diode are connected with the output ends of the digital-analogue conversion circuit respectively, and as long as a corresponding binary-system high or low level is output, the wanted analog voltage can be obtained; in this way, the center frequency of the microstrip filter is changed, tuning of the filter is achieved, the basic performance is good, and use is convenient.

A description is given of a high frequency filter comprising microstrips. The filter comprises at least two resonators (16, 18) which each have, as frequency-determining elements, a first straight microstrip section (28) and a second straight microstrip section (30), which are parallel next to each other, and also a capacitor assembly (22). In each resonator the capacitor assembly is connected between first ends of the microstrip sections and each resonator is exclusively connected to ground at the second ends of the microstrip sections. In each resonator (16, 18) the sum of the two microstrip sections acts as inductive lement. The resonators (16, 18) therefore act in the same manner as a resonator having a single microstrip, the length of which corresponds essentially to the sum of the lengths of the first microstrip section (28) and the second microstrip section (30). This construction of a filter allows a shorter design compared to conventional filter structures.

The invention discloses a broadband frequency synthesizer capable of realizing quick agility. The method is applied to a local oscillator or a radio frequency excitation signal of wireless superheterodyne communication equipment. Quick frequency conversion of the frequency synthesizer is completed by alternate work of the first integrated phase-locked loop and the second integrated phase-locked loop. The frequency locking process of each integrated phase-locked loop is completed in advance, so that the frequency changing time of the system is determined by the switching time of the first radiofrequency switch and the frequency changing time of the microstrip filter, the switching time of the first radio frequency switch is less than 1 microsecond, the frequency changing time of the microstrip filter is less than 10 microseconds, and the frequency changing time of the frequency synthesizer can be within 10 microseconds. In combination with a third integrated phase-locked loop, the output frequency range of the system is 30 MHz to 7 GHz, the frequency range is wide, the frequency changing time is shorter than 10 microseconds, the conversion time is short, and the application requirement of a wide-frequency-band high-speed frequency hopping system can be met.