58results about How to "High isolation between sending and receiving" patented technology

The invention relates to a radar detection technology, and provides a method and a device for detecting radar acquiring low-altitude wind profiles through combination of a frequency-modulated continuous-wave radar technology and a wind profile radar technology against the poor low-altitude detection capability of the existing equipment. One phased-array antenna is adopted to transmit serrated linear frequency-modulated continuous waves, and the other phased-array antenna is adopted to receive echo signals, thus forming a dual-antenna working mode of continuous-wave radar. The array surfaces of the two antennas are horizontally placed side by side with opening surfaces facing upward. Time-sharing scanning is carried out to form five detection wave beams which are the same with wind profile radar, and detection signals and data of the five wave beams are processed in the same way that signals and data of wind profile radar are processed so as to obtain a low-altitude wind profile of which the smallest height can be as small as 50m to 10m and other basic data products. A low-altitude continuous-wave wind measuring radar manufactured by adopting the method and the device of the invention has a wide range of applications.

The invention discloses a device for improving the transmitting and receiving isolation of a mobile terminal, which is positioned between a diplexer and a signal receiving terminal. The device comprises a first coupler which is connected with the diplexer and the signal receiving terminal and is also connected with a modulation circuit and used for coupling a leak signal transmitted from the diplexer with a modulated signal transmitted from the modulation circuit; then the signal after coupling is transmitted to the receiving terminal; and the device also comprises the modulation circuit which is used for modulating a part of an emitting signal and sending the signal after modulation to the first coupler and a second coupler which is connected with the diplexer and an emitting terminal and is also connected with the modulation circuit and is used for coupling a part of the emitting signal to output to the modulation circuit. The invention also discloses a corresponding method to determine the modulation circuit structure and the modulation values of the amplitude, the delay and the phase regulating values of the part of the emitting signal according to the leak signal; the modulation signal is coupled with the leak signal, and the signal after coupling is input into the receiving terminal. The invention can improve the quality of receiving signals, reduce the requirements of the diplexer and so on to isolation and extend standby time.

The invention relates to an antenna technology, and provides a satellite positioning antenna device which can realize low elevation gain, good circular polarization axial ratio and high transmitting and receiving isolation. The satellite positioning antenna device comprises an upper layer of microstrip antenna, an intermediate layer of microstrip antenna, a lower layer of microstrip antenna and a printed circuit board (PCB) with a phase shift feed network on the back side, wherein the upper layer of microstrip antenna comprises an upper layer of microstrip antenna dielectric slab and an upper layer of microstrip antenna radiation patch layer; the intermediate layer of microstrip antenna comprises an intermediate layer of microstrip antenna dielectric slab and an intermediate layer of microstrip antenna radiation patch layer; the lower layer of microstrip antenna comprises a lower layer of microstrip antenna dielectric slab and a lower layer of microstrip antenna radiation patch layer; a feed probe of the lower layer of microstrip antenna, a feed probe of the intermediate layer of microstrip antenna and a coaxial feed cable of the upper layer of microstrip antenna are connected with the feed network; and a first plated-through hole is formed in the central position of the lower layer of microstrip antenna, a second plated-through hole is formed in the central position of the intermediate layer of microstrip antenna, and a third plated-through hole is formed in the lower layer of microstrip antenna at the feed probe of the intermediate layer of microstrip antenna.

The invention discloses a signal interference suppression device, which comprises a first duplexer, a second duplexer, a third duplexer, a fourth duplexer, a first combiner, a second combiner, a first circulator, a second circulator, a first attenuator and a second attenuator, wherein a TX / RX port of the first duplexer is connected with a first port of a base station; a TX port of the first duplexer is connected to the first combiner through the first circulator, and an RX port of the first duplexer is connected to the second combiner through the first attenuator; a TX / RX port of the second duplexer is connected with a second port of the base station, a TX port of the second duplexer is connected to the first combiner through the second circulator, and an RX port of the second duplexer is connected to the second combiner through the second attenuator; the first combiner is connected with a TX port of the third duplexer and a TX port of the fourth duplexer; the second combiner is connected with an RX port of the third duplexer and an RX port of the fourth duplexer; a TX / RX port of the third duplexer is connected with a first port of an antenna feed system; and a TX / RX port of the fourth duplexer is connected with a second port of the antenna feed system.

A mixed circulator of high transceiver and isolation type is compounding three power dividers and one hybrid ring on media substrate, series-connecting said power dividers and equally divided end of hybrid ring to be ring form, using difference end of hybrid ring as emission end of circulator, using sum end of one power divider as antenna end of circulator and using sum end of another power divider as receiving end of circulator then setting ground resistance separately on each port.

This invention relates to a sonic surface wave duplexer used for cluster communication system hand-held terminal, comprising a transmitting end first sonic surface wave filter and a receiving end sonic surface wave filter, a transmitting end second sonic surface wave filter located in the front of power amplifier, wherein, the outlet of transmitting end second sonic surface wave filter attaches to the inlet of transmitting circuit power amplifier, then to transmitting end first sonic surface wave filter inlet, the other end via electrode attaches to the front section of transmitting circuit power amplifier, the said transmitting end second sonic surface wave filter is composed of sonic surface wave filter in form of ladder and sonic surface wave band-reject filter, which is formed through making the resonator and external inductance attach in the shape of II. The invention has the advantages of high receive-and-transmit isolation, low insertion loss, small volume and so on.

The invention provides a single-station pulse RCS (Radar Cross Section) testing system based on switch switching. The single-station pulse RCS testing system comprises a main control computer, a transmitter, a receiving-transmitting switch, a receiver, a multipath pulse generator and a receiving-transmitting antenna, wherein the main control computer is used for setting the parameters of the transmitter according to measured parameters, and setting the parameters of the receiver and the parameters of the multipath pulse generator at the same time; the transmitter comprises a transmitting source and a pulse modulator; the multipath pulse generator is used for generating a first pulse baseband signal, and transmitting to the control end of the pulse modulator; the multipath pulse generator is used for generating a second pulse baseband signal, and transmitting to the control end of the receiving-transmitting switch; the receiving-transmitting antenna is used for receiving an echo signal of a tested target; the echo signal is transmitted to the receiver after passing through the third pin of the receiving-transmitting switch; and the receiver is used for processing the echo characteristic of the tested target, and transmitting to the main control computer.

The invention discloses a remote displacement measurement device, system and method having a clutter inhibition function. The system comprises a central controller, at least one main measurement device and at least one secondary measurement device, wherein the main measurement device is used for sending an emission signal to the secondary measurement device, receiving a forwarding signal emitted by the secondary measurement device and calculating relative displacement according to the received forwarding signal, the secondary measurement device is used for receiving the emission signal of the main measurement device and emitting the forwarding signal, and the main measurement device and the secondary measurement device both have two sets of polarized orthogonal antennas. When the main measurement device emits the signal, natural landform scattered strong clutter signals and a polarized direction of an emission antenna are consistent, polarized characteristics of a reception antenna and the emission antenna are in polarized orthogonal, so the reception antenna has the quite strong inhibition effect on background clutter, so system precision is improved; during cofrequency transmit-receiving, an acquired transmit-receiving isolation degree can be greater compared with a single antenna and the double polarized antennas, a large measurement distance is acquired through enhancing emission power.

The invention discloses a transmission treatment method of an optical fiber repeater and a variable-channel transmission optical fiber repeater, wherein the repeater comprises the modules of a power supply, a microprocessor, an antenna feeder system, a plurality of radio receivers, a plurality of radio transmitters, optical fibers, a wavelength division multiplexer, a wavelength decomposition multiplexer, a radio signal division mixer, an optical transmission signal adaptor, an optical transmission interface and the like. The invention is capable of providing radio communication relay transmission service for all radio communication system users in special regions and tunnels, meets the requirements of reducing the number of antennas, reducing the number of the used optical fibers, reducing mutual interference among systems and meeting the insulation among the systems, is capable of realizing long-distance optical transmission relay among the optical fiber repeaters when the optical fibers are cascaded to the optical fiber repeaters, and has the characteristics of being applicable to a plurality of radio communication systems for relay transmission.

The invention discloses an off-axis reflection-type optical antenna design method applied to space laser communication. The off-axis reflection-type optical antenna design method includes the following steps: determining an optical antenna objective lens initial structure; calculating and selecting an optical antenna overall initial structure; conducting aberration correction; conducting optical antenna error analysis; conducting isolation analysis. According to the off-axis reflection-type optical antenna design method, under the condition that the caliber, the view field and the amplification factor of an optical antenna are guaranteed, the focal distance, the wave aberration, the structural style, the error distribution and the like of the optical antenna are analyzed and calculated. By means of the off-axis reflection-type optical antenna design method, the image quality, the isolation degree and the transmission efficiency of the laser communication optical antenna can be accurately evaluated, and correlation technical indexes of the optical antenna in the laser communication field are improved.

The invention discloses a highly integrated four-channel S-band transceiver module, comprising a receiving channel, a transmitting channel and an external interface, wherein the receiving channel comprises paired band branch I and Q receiving channels, and the transmitting channel comprises paired band branch I and Q transmitting channels. The two-port feeding of the transceiver module can effectively improve the circular polarization axis ratio of the antenna, and the transceiver channels are separated, which can improve the isolation of the transceiver, reduce the interference between channels and help to improve the communication capability of the system. Furthermore, the invention also discloses a phased array antenna with the high-integration four-channel S-frequency transceiver module, which can realize polarization adjustability by cooperating with a four-point feeding antenna unit, realizes polarization conversion and beam scanning of the phased array antenna through electroniccontrol phase shift and branch switching, effectively reduces the antenna port surface, and realizes miniaturization design.

The invention discloses a phased array radar multifunctional sub-array beam forming network which comprises a primary sub-array beam forming network, two secondary sub-array beam forming networks and four tertiary sub-array beam forming networks. The primary sub-array beam forming network comprises a primary transmitting port and a primary receiving port, the two secondary sub-array beam forming networks comprise respective secondary transmitting ports and secondary receiving ports, the four tertiary sub-array beam forming networks comprise respective tertiary transmitting ports, tertiary receiving ports and TR (transmitting receiving) channel interfaces, two branch ports of the primary sub-array beam forming network are respectively connected with the two secondary sub-array beam forming networks, and four branch ports of the two secondary sub-array beam forming networks are respectively connected the four tertiary sub-array beam forming networks. Compared with the prior art, the phased array radar multifunctional sub-array beam forming network has the advantages that sub-array beams in different scales can be formed by the single phased array radar multifunctional sub-array beam forming network, and the sub-array beam forming networks in different scales can be simultaneously used and also can be individually used; the phased array radar multifunctional sub-array beam forming network is low in equipment quantity and has multiple functions.

The invention discloses a branching optical fiber repeater which is composed of a power source, a microprocessor, an antenna feed system, a wireless receiver, a wireless transmitter, optical fiber, an analog-digital converter, a digital-analog converter, a time division multiplexing device, a time division de-multiplexing device, a wireless signal dividing and combining unit, an optical transmission signal adaptor, an optical transmission interface and other modules. An optical fiber repeater branching transmission method is capable of providing wireless communication relay transmission service for various types of wireless communication system users in a special region and tunnels, reducing the number of antennae and optical fiber, increasing relay transmission distance, reducing system cost and reducing mutual interference between systems and suitable for carrying out relay transmission for various wireless communication systems.

The invention discloses a low-cost broadband millimeter wave array antenna, and belongs to the technical field of antennas. The antenna comprises a metal horn part and a back cavity patch antenna, wherein the metal horn part comprises at least two metal horn antenna units for transmitting and two metal horn antenna units for receiving which are distributed in an array; and the back cavity patch antenna comprises an antenna feed dielectric plate, and transmitting feed units and receiving feed units which are arranged on the antenna feed dielectric plate correspond to the transmitting metal hornantenna units and the receiving metal horn antenna units in number respectively. The metal horn part is attached to the back cavity patch antenna through conductive adhesive, and each patch antenna radiation source is attached to the lower portion of the corresponding metal horn antenna unit. The antenna can be realized only through a mature, simple and low-cost machining process and a standard single-layer PCB process; and meanwhile, other properties such as return loss, bandwidth and radiation pattern keep excellent characteristics.

The invention provides a photoelectric fusion continuous wave radar leakage interference elimination device and method, and belongs to the technical field of radars. According to the photoelectric fusion continuous wave radar leakage interference elimination device, leakage interference is eliminated by adopting a microwave photon link and cable link fusion active cancellation method. And the microwave photon link regulates and controls the phase, delay and amplitude of the reference signal led out by the continuous wave signal emission source to achieve the cancellation matching conditions ofphase inversion, delay matching and equal amplitude with the leakage interference signal. The photoelectric fusion continuous wave radar leakage interference elimination device has the advantages ofwide working frequency band range, large bandwidth and high regulation and control precision, effectively suppresses leakage interference signals, and ensures high transceiving isolation of the continuous wave radar.

The invention provides a split-type guided wave radar liquid level meter based on gated frequency modulation continuous waves. The liquid level meter comprises an electronics unit which is disposed outside a container with a to-be-measured liquid level, and is used for generating a transmitting signal, a coaxial cable which is connected with the electronics unit and is used for transmitting the transmitting signal to a coaxial wave guide rod arranged in a container with the to-be-measured liquid level, and a coaxial wave guide rod which generates echo signals based on the frequency domain reflection principle and returns the echo signals to the electronics unit, and then acquires height information of theto-be-measured liquid level. Remote installation of electronics and radar probes can be realized, electronics are far away from a high-temperature, high-pressure and high-irradiation container, and the working reliability of equipment is improved; a relatively large system bandwidth is easy to realize in low-frequency application, the measurement precision is improved, and meanwhile, the miniaturization of equipment is facilitated; a gate controlled switch is adopted to control a transmitting channel and a receiving channel, so that relatively high system transmitting and receiving isolation is realized; and the high-pass filter is adopted to effectively suppress direct wave signals, and saturation of the intermediate-frequency amplifier can be prevented.

The invention discloses a miniaturized three-band satellite communication antenna comprising three radiation sheets (11, 12 and 13) respectively working in three bands, a feed network (2) and a base (3), wherein the three radiation sheets are stacked and fixed on the base (3) through a lamination screw; and the feed network (2) is connected with the radiation sheet stacked at the bottommost layer into a whole and used for respectively feeding the three radiation sheets. By using the miniaturized three-band satellite communication antenna, the design and installation problems of an antenna in a miniaturized terminal are solved.

The invention provides an interphone repeater which solves the problems that an existing interphone repeater is large in size and not suitable for being moved or used in emergency. The interphone repeater comprises a shell, a transceiving controller and a duplexer, wherein the transceiving controller and the duplexer are installed in the shell and are electrically connected. The duplexer comprises a duplex integrated circuit board, a transmitting filter, a receiving filter and a porous metal duplex groove, wherein the transmitting filter and the receiving filter are installed on the duplex integrated circuit board, and the porous metal duplex groove covers the transmitting filter and the receiving filter. The transmitting filter and the receiving filter respectively comprise a plurality of coils. The porous metal duplex groove comprises a plurality of cavities corresponding to the coils in a one-to-one mode. The shell comprises a shell cover and a shell body, wherein the porous metal duplex groove is formed in the shell body.

The invention discloses a C frequency band miniaturization one-transmitter four-receiver medium frequency unit, which is used for a C frequency band on-board satellite communication system. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit is constituted by a modulator, a demodulator, a frequency synthesizer, an amplifier, an attenuator, an attenuation amplifier, a filter, a filter amplifier, and a switch, and is controlled by serial interfaces. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit is especially suitablefor being used as a transceiving integrated medium frequency unit of an on-board satellite communication terminal, and has advantages of miniaturization, low power consumption, integrated design, high speed frequency hopping, high transceiving isolation degree, stable performance, and ability of functioning normally in severe environment. The C frequency band miniaturization one-transmitter four-receiver medium frequency unit comprises four separation cavities, and transceiving signals are effectively isolated from each other by adopting spatial cavity separation, and then transmitting signals are prevented from being coupled with receiving signal by the space, and receiving performance cannot be affected; and in addition, by adopting effective filtering of transceiving medium frequency control signals, the high frequency signals of the control signals can be filtered effectively, and the demodulation performance of the receiving medium frequency unit can be obviously improved.

The invention discloses a polarization torsion active angle reflection direction backtracking system. An active polarization torsion antenna array, a first polarization selection surface and a secondpolarization selection surface are orthogonal pairwise and spliced to form a trihedral corner reflector. Direction backtracking and polarization torsion of microwave signals are achieved by means of mirror reflection of the active polarization torsion antenna array and the polarization selection surface so as to improve receiving and transmitting isolation. Besides, the active characteristic of the polarized torsion antenna array is utilized, and power amplification of backtracking signals can be realized according to the requirements of the application environment. The system is suitable forthe fields of radar, microwave power transmission, satellite communication and the like and has the characteristics of high transceiving isolation, controllable echo power and the like and has a simple design process and can be produced in batches by adopting a printed circuit technology.

The invention discloses a full-duplex meteoric trail communication device based on a single antenna, and relates to the field of meteoric trail communication. The device comprises a link controller, a modem, a transceiver, a power amplifier, and a diplexer. The device employs the diplexer which is large in withstood power, is small in incoming loss, and is high in receiving and transmitting isolation. A receiving channel and a transmitting channel are combined into one full-duplex channel under the condition of guaranteeing the communication performance of a system. The full-duplex communication between different meteoric trail communication devices can be completed through one antenna, thereby reducing the number of antennas, reducing the requirements for an antenna construction field, and shortening the starting construction time of meteoric trail communication. The device is large in withstood power, is high in receiving and transmitting isolation, is simple and convenient in starting construction, is high in integration degree, is stable and reliable in performance, is especially suitable for a meteoric trail communication occasion where the antenna construction field is limited and there are special requirements for starting construction.

The invention belongs to the technical field of radio frequency identification, in order to solve the problem of low identification rate of some angles in long-distance identification of identity cardinformation, the invention provides an identification card information collecting device, an identification system and a door body. The collecting device comprises a first antenna, which is used forexciting the identity card in a first posture and sending a reading instruction to the identity card. A second antenna arranged perpendicularly to the first antenna for exciting the ID card in the second posture and sending a reading instruction to the ID card; a third antenna disposed in parallel with and partially coinciding with the second antenna for receiving feedback information of the identity card. The ID card in the first posture is excited by the first antenna, the ID card in the second posture is excited by the second antenna, and the feedback information of the ID card is receivedby the third antenna, so that the excitation of the ID card and the reception of the feedback information of the ID card in a long distance can be realized.

According to an aspect there is provided a duplex filter arrangement (100) for frequency-division duplex communication. The duplex filter arrangement (100) comprises a filtering arrangement that comprises filters (102) of a first type, a filter (104) of a second type and a filter (106) of a third type connecting a first radio frequency port (108), a second radio frequency port (110), a third radiofrequency port (112) and a fourth radio frequency port (114). The filters (102, 104, 106) are configured so that some of the filters are configured to pass signals at a first frequency band and reject signals at a second frequency band, and some of the filters are configured to reject signals at the first frequency band and pass signals at the second frequency band. Further, the filters (104, 106) of the second type and the third type are configured so that the phase response of the filter (104) of the second type differs at the first frequency band and at the second frequency band substantially 180 degrees from the phase response of the filter (106) of the third type. This enables implementing a duplex filter arrangement without using additional baluns that cause transmitter and receiverlosses.

The invention relates to the technical field of antenna array design of millimeter wave security check imaging, and discloses a strip line feed horn antenna applied to millimeter wave security check imaging. According to the strip line feed horn antenna applied to millimeter wave security check imaging, a microstrip line-to-strip line structure is arranged on a printed circuit board, a choke groove is additionally formed between a transmitting antenna array and a receiving antenna array, and the microstrip line-to-strip line structure is used for realizing conversion from a microstrip line toa strip line; and the choke groove is used for suppressing interference signals outside reflection cavities of the transmitting antenna array and the receiving antenna array so as to improve the receiving and transmitting isolation. The strip line feed horn antenna applied to millimeter wave security check imaging has the characteristics of wide band, high efficiency, high isolation, simple structure and high assembly reliability.