33 results about "Branch line coupler" patented technology

The invention relates to the technical field of wireless communication, in particular to a wide-stop-band filtering coupler based on a rectangular coaxial structure, which comprises a rectangular coaxial outer conductor upper cavity, an inner conductor circuit and a rectangular coaxial outer conductor lower cavity, and is characterized in that the inner conductor circuit is arranged between the rectangular coaxial outer conductor upper cavity and the rectangular coaxial outer conductor lower cavity through a medium supporting block; the inner conductor circuit comprises an input port, a straight-through port, a coupling port, an isolation port and a branch line coupler structure. Four ports of the branch line coupler structure are respectively in coupling connection with the input port, the straight-through port, the coupling port and the isolation port through a quarter-wavelength open-circuit parallel coupling line structure. The novel rectangular coaxial transmission line is adopted for design, so that the circuit has the advantages of the rectangular coaxial metal transmission line, the electromagnetic shielding structure enables the circuit not to be easily interfered by external electromagnetic wave signals, and the rectangular coaxial transmission line can control the impedance requirement by changing the proportion of the inner conductor and the outer conductor according to different design requirements.

The invention discloses a C wave band reflection type phase shifter based on a cross-direction coupling line coupler, and belongs to the field of wireless communication and digital signal processing, the reflection type phase shifter is designed based on the cross-direction coupling line coupler, and compared with an existing branch line coupler and an existing Lange coupler, the C wave band reflection type phase shifter has the advantages of being small in size, low in insertion loss, wide in broadband and the like. A digital phase shifter used by a traditional phased-array antenna can be replaced, and the pain point problems of high cost, high power consumption and the like of the traditional phased-array antenna are solved; besides, the reflective phase shifter provided by the invention can be integrated on a PCB, has the advantages of being easy to process, low in cost, small in size and the like, is easy to integrate with a planar printing phased array antenna, and realizes miniaturization and low cost of the phased array antenna.

The invention discloses a radiating element, a dual-polarized antenna array and a circular polarization method of electromagnetic waves. The radiation element comprises: a radiation patch for transmitting and receiving electromagnetic waves and switching a radiation mode of the electromagnetic waves from linear polarization to circular polarization; the metal reflector is used for reflecting the electromagnetic waves from the radiation patch, and the metal reflector is located below the radiation patch; the microstrip line is used for transmitting an excitation signal to the radiation patch, and the microstrip line is located on the printed circuit board on the back surface of the metal reflector; and the 3dB branch line coupler is used for dividing one path of input signal into two paths of output signals with equal amplitude, a 90-degree phase difference is introduced between the two paths of output signals, and the 3dB branch line coupler is connected with the microstrip line. According to the dual-polarized antenna, the technical problem that the port isolation and the polarization isolation corresponding to the antenna are low when the low-profile working characteristic of a traditional dual-polarized antenna is ensured is solved.

An amplifier circuit includes a first divider, a control amplifier, a second divider, a first auxiliary amplifier, a second auxiliary amplifier, a first node to which a sixth signal is input, a second node to which a seventh signal is input, a third node to which a third signal is input, and a fourth node to which an output signal is output, and includes a lumped constant branch line coupler that combines the sixth signal, the seventh signal, and the third signal and outputs the combined signal as an output signal, and a signal of a center frequency input to the first node has a power amplitude that is smaller than the power amplitude of the signal distributed to the third node, and the power amplitude of the sixth signal is greater than the power amplitude of the seventh signal.

A beam switching system (10) includes a selection circuit (12) and a branch line coupler (11). The selection circuit (12) includes an input port (SIP1) for receiving the input radio frequency signal (IRF1), and two output ports (SOP11, SOP12). The selection circuit (12) selects at least one of its two output ports (SOP11, SOP12) to output an output radio frequency signal (ORF1). The branch line coupler (11) includes two input ports (DIP11, DIP12) respectively coupled to two output ports (SOP11, SOP12) of the selection circuit (12) and used to receive the output radio frequency signal (ORF1), and two output ports (DOP11, DOP12) respectively used to couple two antennas (20, 25).

The application discloses an S-band reflective phase shifter based on a cross-coupling line coupler, and belongs to the fields of wireless communication and digital signal processing. The reflective phase shifter is designed based on the cross-coupling line coupler, has the advantages of small size, low insertion loss and wide bandwidth compared with existing branch line couplers and Langer couplers, can replace the digital phase shifter used by a traditional phased array antenna, and solves the problems of high cost and high power consumption of the traditional phased array antenna. In addition, the reflective phase shifter can be integrated on a PCB, has the advantages of easy processing, low cost and small size, is easy to be integrated with a planar printed phased array antenna, and realizes the miniaturization and low cost of the phased array antenna.

The invention discloses a branch line coupler with a digitally controllable working frequency band. A port 1, a source electrode of M3, a drain electrode of M1 and a positive end of C1 are connected with V1; the grid electrode of M3 is connected with the negative end of R3; the positive end of the R3 is connected with a port 5; the drain electrode of the M3 is connected with the positive end of the L3; the negative end of the L3 is connected with the drain electrode of the M4; the grid electrode of the M4 is connected with the positive end of the R4; the negative end of the R4 is connected with the port 6; the source electrode of the M1 is connected with the positive end of the L1; the grid electrode of the M1 is connected with the negative end of the R1; the positive end of the R1 is connected with the positive end of the R2, and a port 9 is connected with the V5; the port 2, the negative end of the L1, the source electrode of the M4 and the positive end of the C2 are connected with the V2; the port 3, the negative end of the L2, the negative end of the C2 and the source electrode of the M6 are connected with the V3; the source electrode of M2 is connected with the positive end of L2; the grid electrode of the M6 is connected with the positive end of the R6; the negative end of the R6 is connected with a port 7; the grid electrode of M2 is connected with the negative end of R2; the drain electrode of the M5 is connected with the positive end of the L4; the grid electrode of the M5 is connected with the negative end of the R5; the positive end of the R5 is connected with a port 8; the invention designs the branch line coupler of which the working frequency band can be digitally controlled, so that the digital control of the working frequency is realized, and the coupler can work under different frequencies.

The invention discloses a dual-polarization low-profile phased array antenna based on a miniaturized reflection type phase shifter, which belongs to the field of wireless communication, and uses the miniaturized reflection type phase shifter which is independently developed, small in size, low in cost, low in power consumption and low in insertion loss to replace a traditional digital phase shifter. The digital phase shifter is designed based on a cross-direction coupling line coupler, and compared with a branch line coupler, the cross-direction coupling line coupler has more compact size and wider bandwidth; compared with a Lange coupler, the cross-direction coupling line coupler is more compact in size and lower in manufacturing difficulty; the phase shifter can realize 360-degree continuous phase shift within the bandwidth, and has the advantages of small size, low insertion loss, wide bandwidth and the like; therefore, the phase shift between the array units is regulated and controlled through the direct current bias voltage, the phased array antenna provided by the invention can realize + / -45-degree beam scanning on a two-dimensional plane, and can realize the functions of beam directional emission, beam continuous scanning and the like in a wireless communication system.

The utility model discloses a frequency-adjustable power combiner based on a branch line coupler, which comprises a branch line coupler body, and the branch line coupler comprises a first input port assembly, a second input port assembly, an output port assembly and a load port assembly. Connecting ports are arranged between the first input port assembly and the second input port assembly, between the first input port assembly and the output port assembly, between the second input port and the load port, and between the output port and the load port, the connecting ports are connected with one ends of a group of transmission lines, the other ends of the transmission lines are connected with the U-shaped connecting line assembly, and the U-shaped connecting line assembly is connected with the U-shaped connecting line assembly. The transmission line is detachably connected with the branch line coupler body and the U-shaped connecting line assembly through a connecting mechanism.

According to the broadband high-efficiency power amplifier based on the open-circuit branch coupler, good fundamental wave impedance matching is achieved, and meanwhile second harmonic suppression is achieved. The coupler adopts a three-branch-line structure to realize the broadband characteristic. After the three-branch broadband coupler is designed, the main line and the branch lines on the two sides are converted into T-shaped junctions with open-circuit branches, so that the converted coupler has the characteristic of suppressing second harmonics. And then a T-shaped matching network is loaded behind the three-branch open-circuit branch coupler so as to realize better fundamental wave impedance matching. According to the open-circuit branch branch line coupler structure, the functions of second harmonic suppression and good fundamental wave impedance matching can be achieved at the same time. The power amplifier designed based on the coupler has broadband and high-efficiency performance, and has better output power, efficiency and gain in the whole working frequency band.

To provide an amplifier circuit capable of suppressing degradation of characteristics.SOLUTION: An amplifier circuit 100 comprises: a first splitter 14 which splits an input signal Si into a first signal S1 and a second signal S2; a control amplifier 10 which amplifies the first signal S1 and outputs the amplified signal as a third signal S3; a second splitter 16 which splits the second signal S2 into a fourth signal S4 and a fifth signal S5, which have different phases at the center frequency of the operating bandwidth; a first auxiliary amplifier 12a which amplifies the fourth signal S4 and outputs the amplified signal as a sixth signal S6; a second auxiliary amplifier 12b which amplifies the fifth signal S5 and outputs the amplified signal as a seventh signal S7; and a lumped-constant branch-line coupler 18 which synthesizes the third signal S3, the sixth signal S6, and the seventh signal S7 and outputs the synthesized signal as an output signal So. The power amplitude of the third signal S3 is smaller than the power amplitude of the output signal So, and the power amplitude of the sixth signal S6 is greater than that of the seventh signal S7.SELECTED DRAWING: Figure 1

A branch-line coupler includes an input port, arranged on a bottom layer of the substrate; an isolated port, arranged on the bottom layer; a first output port, arranged on a top layer of the substrate; a second output port, arranged on the top layer; a ground layer, arranged in a middle layer of the substrate; a first transmission line, connected between the input port and the isolation port; a second transmission line, connected between the first output port and the second output port; a first branch line, connected to the input port; a second branch line, connected to the isolated port; a third branch line, vertically connected to the first output port and connected to the first branch line through a first through hole; and a fourth branch line, vertically connected to the second output port and connected to the second branch line through a second through hole.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

A beam switching system, beam switching method, and antenna device are provided. The beam switching system includes a selection circuit and a branch line coupler. The selection circuit includes an input port for receiving the input radio frequency signal and two output ports. The selection circuit selects at least one of its two output ports to output the output radio frequency signal. The branch line coupler includes two input ports respectively coupled to two output ports of the selection circuit and used to receive the output radio frequency signal, and two output ports respectively used to couple two antennas.

The invention discloses a monolithic integrated flat electro-optic optical frequency comb generation system, belongs to the technical field of optical frequency combs, and can solve the problems that an existing optical frequency comb generation system is low in integration degree and poor in working stability. The system comprises: a substrate; the buried oxide layer is formed on the substrate; the electro-optical modulator comprises an optical waveguide and two modulation arms; the optical waveguide and the two modulation arms are arranged on the buried oxide layer, and the input end of the optical waveguide is connected with the light source; the oxidation insulating layer coats the surfaces of the optical waveguide and the two modulation arms; the branch line coupler is arranged on the outer surface of the oxidation insulating layer, and two output ports of the branch line coupler are electrically connected with the two modulation arms respectively; and the electro-optical modulator outputs a flat electro-optical frequency comb under the coupling action of the branch line coupler. The method is used for generating the flat electro-optical frequency comb.

A stacked branch-line coupler for passively generating I / Q signals. The stacked branch-line coupler is formed in a multi-layer substrate and meandered series paths and meandered shunt paths are formed on separate layers. The meandered series path may be formed from a first portion and second portion, where the first and second portions are electrically in series and disposed on different layers of the substrate. The meandered shunt path may be formed from a first portion and second portion, where the first and second portions are electrically in series and disposed on different layers of the substrate. The layers with the shunt path portions may be different from the layer with the series path portions, such that the coupler is formed on at least four layers. The portions may be positioned in overlapping position in the layers of the substrate in a stacked manner.

A circularly polarized antenna includes an antenna unit and a feeding unit, and the antenna unit and the feeding unit are stacked up and down; the antenna unit includes a first antenna subunit arranged on a top layer of the first substrate, a parasitic element arranged in a middle layer of the first substrate, and a second antenna subunit arranged on a bottom layer of the first substrate; the feeding unit includes a coupling slot group, arranged on a top layer of the second substrate; a matching microstrip line group, arranged on a middle layer of the second substrate; a feeding line group, arranged on a bottom layer of the second substrate; a branch line coupler, arranged on a bottom layer of the second substrate, wherein the matching microstrip line group is electrically connected between the feeding line group and the branch line coupler through a hole group.

This application relates to the field of microwave radio frequency technology, and in particular to a single-balanced mixer and system integrating second harmonic extraction and self-shielding functions. The single-balanced mixer includes: a branch-line coupler, a diode mixer unit, an RF input port, a local oscillator input port, and an intermediate frequency (IF) output port. The branch-line coupler includes two parallel transmission arms and two series transmission arms. The RF input port and the local oscillator input port are respectively connected to the input terminals of the branch-line coupler. The signal input terminal of the diode mixer unit is connected to the output terminal of the branch-line coupler, and the output terminal of the diode mixer unit is connected to the IF output port. A second harmonic extraction port is led out on the transmission line between the output terminal of the branch-line coupler and the signal input terminal of the diode mixer unit. By adopting this application, down-conversion of down-going reception and extraction of up-going second harmonic carrier are simultaneously achieved, solving the self-interference problem between transmission and reception, simplifying the circuit structure, and improving the RF energy utilization rate.

The present invention discloses a small dual-frequency branch line coupler with equal phase difference, and the specific scheme is as follows: it includes a folded dual branch line, an open / short circuit loaded parallel branch and four 50 ohm input / output ports; the folded dual branch line includes a first transmission line, a second transmission line, a third transmission line and a fourth transmission line; the open / short circuit loaded parallel branch includes a first open / short circuit loaded transmission line, a second open / short circuit loaded transmission line, a third open / short circuit loaded transmission line and a fourth open / short circuit loaded transmission line; the first open / short circuit loaded transmission line includes a first bent transmission line, a first winding open line and a first short circuit line; the second open / short circuit loaded transmission line includes a second bent transmission line, a second winding open line and a second short circuit line. The device can achieve small size, dual frequency band, equal phase difference, and has the characteristics of output ports on the same side.

A terahertz wave band planar third harmonic mixer based on a branch line coupler relates to the technical field of terahertz communication and radar, and comprises a branch line coupler, an intermediate frequency low-pass filter, a radio frequency local oscillator dual-frequency band-pass filter, two Schottky diode single tubes, an open-circuit line, a T-junction and two sections of matching circuits. By adopting a pure plane structure, the terahertz filter has the advantages of being simple in circuit structure, easy to integrate, low in frequency conversion loss and the like, and can be applied to the fields of miniaturized and high-integration terahertz communication, radar and the like. A single balance structure and a branch line coupler are used as a 90-degree hybrid network, a radio frequency signal and a local oscillator signal are respectively input into two Schottky diodes at a 90-degree phase difference for frequency mixing, and an intermediate frequency signal after frequency mixing is output after passing through structures such as an intermediate frequency low-pass filter, so that improvement of radio frequency echo and local oscillator echo is facilitated, and the performance of the system is improved. When the device and other devices are integrated in one assembly in a gold wire bonding mode, the frequency conversion performance is hardly influenced.

The invention belongs to the field of radio frequency microwave passive devices, discloses a microstrip filtering branch line coupler, and aims to provide a compact microwave passive device capable of simultaneously realizing coupling and filtering functions so as to meet the requirements of a modern communication system on miniaturization, high selectivity and out-of-band rejection capability. According to the technical scheme, each part comprises an input port, an output port, a coupling port, an isolation port, four uniform impedance half-wavelength resonators, two uniform impedance half-wavelength resonators of which the centers are loaded with stub lines, four 50-omega microstrip line ports and four high-impedance transmission lines connected with the resonators. According to the invention, a resonant circuit is introduced at a quarter-wavelength transmission line node of the multi-branch broadband branch line coupler, which is equivalent to a coupling topology network. Four half-wavelength resonators with uniform impedance and two half-wavelength resonators with center loading stub lines are utilized to realize a coupling function of the branch line coupler, and a filtering characteristic is introduced to the coupler. The resonators are connected with the ports through high-impedance transmission lines, and the resonators are mutually coupled through gaps. According to the filtering branch line coupler disclosed by the invention, the coupling bandwidth can be increased, and the high-order filtering characteristic is introduced to improve the filtering selection characteristic.

The present invention discloses a branch-line coupler based on coaxial TSVs and CPWs. The coupler comprises two symmetrically arranged three-dimensional zigzag transmission lines, each vertically interconnected by the coaxial TSVs and CPWs, and two sets of planar zigzag CPW transmission lines. The two sets of three-dimensional zigzag transmission lines, each vertically interconnected by the coaxial TSVs and CPWs, are connected by the central conduction strips of the two planar zigzag CPWs. By combining coaxial TSVs and CPWs, the present invention significantly reduces the size of conventional branch-line couplers, achieving miniaturization of millimeter-wave branch-line couplers.

The present invention relates to a transmission line including a zigzag pattern ground shield structure. The transmission line includes a plurality of rectangular unit ground units including a first metal pattern and a second metal pattern arranged on two different layers, wherein each of the first metal pattern and the second metal pattern is bent in an L shape and symmetrically arranged at positions facing each other on the basis of an XY plane, and the unit ground units are periodically repeated in X-axis and Y-axis directions to form a diagonal zigzag pattern.

The invention provides a broadband millimeter wave predistortion chip. The chip comprises a first radio frequency transmission line, a branch line coupler, a first Schottky diode core, a first electromagnetic loading circuit, a second Schottky diode core, a second electromagnetic loading circuit and a second radio frequency transmission line. The branch line coupler divides an input radio frequency signal into two paths, and the two paths are respectively processed by the Schottky diode core and the electromagnetic loading circuit and then combined into one path to be output. The Schottky diode is manufactured by adopting a gallium arsenide chip processing technology, and the amplitude and phase of a radio-frequency signal are adjusted by adjusting the direct-current bias voltage of a Schottky diode core. The chip can effectively compensate the nonlinear distortion of the radio frequency power amplifier, improve the linearity of a communication system, reduce the bit error rate and adjacent channel interference, is suitable for a millimeter wave communication system with high transmission rate, wide band, miniaturization and high integration level, and has a wide application prospect.

The invention provides an amplifier circuit capable of realizing miniaturization. The amplifier circuit includes: a first distributor; a control amplifier; a second dispenser; a first auxiliary amplifier; a second auxiliary amplifier; and a branch line coupler in which a first characteristic impedance at a center frequency of the first and third transmission lines is higher than a reference impedance, a second characteristic impedance at a center frequency of the second and fourth transmission lines is lower than the first characteristic impedance / square root of 2, and an amplitude of a power of the seventh signal is greater than an amplitude of a power of the sixth signal.

A branch-line coupler includes a first transmission line, a second transmission line, a first bent transmission line, and a second bent transmission line. The first transmission line includes a first elongated transmission line, a first branch transmission line, and a second branch transmission line. The first elongated transmission line extends along a predetermined direction. The first branch transmission line has a first slit, and the second branch transmission line has a second slit. The first and second branch transmission lines are axially symmetrical about a first axis. The first and second transmission lines are also axially symmetrical about a second axis orthogonal to the first axis. The first bent transmission line is electrically connected to the endpoints of the first and second transmission lines on the same side, while the second bent transmission line is electrically connected to the endpoints of the first and second transmission lines on the opposite side.

A circularly polarized antenna comprises an antenna part and a feed part which are stacked up and down, the antenna part is arranged on a first substrate, and the antenna part comprises a first antenna unit which comprises a cross-shaped metal patch and a top layer arranged on the first substrate; the parasitic element forms a square with four disconnected edges by four metal strips and is arranged on the middle layer of the first substrate; the second antenna unit comprises a square metal patch which is arranged on the bottom layer of the first substrate; the feed part is arranged on the second substrate, and the feed part comprises a coupling slot arranged on the top layer of the second substrate; the matching microstrip line is arranged on the middle layer of the second substrate; the feed-in line is arranged on the bottom layer of the second substrate; the branch line coupler is arranged on the bottom layer of the second substrate, the matching microstrip line is electrically connected between the feed-in line and the branch line coupler through a via hole, the thickness of the substrate is increased through the layer changing technology, the achievable impedance range is increased, impedance matching is achieved, the gain bandwidth, the axial ratio bandwidth and the return loss bandwidth are increased, and the antenna performance is optimized.

The application provides a quadrupole high-isolation MIMO array antenna, which comprises a dielectric substrate, a metal floor printed on the upper surface of the dielectric substrate and N feed networks on the lower surface, N is greater than or equal to 2, a decoupling baffle fixed on the upper surface of the dielectric substrate and N periodically arranged dual-polarized dipole radiating units, and the feed structure of the dual-polarized dipole radiating unit is connected with the output end of the feed network; the feed network comprises two Wilkinson power dividers, two pi-type attenuators connected with four output ends of each Wilkinson power divider, one Schumann phase shifter and three branch line couplers; when two input ends of one of the branch line couplers and the outer input ends of the other two branch line couplers are simultaneously fed, the linear polarization characteristics of 0°, 90°, -45° and 45° can be simultaneously realized on one dual-polarized dipole radiating unit connected with the output end of the feed network, and the defect of complex antenna structure in the prior art is solved.

To provide an amplifier circuit capable of being miniaturized.SOLUTION: An amplifier circuit 100 comprises: a first splitter 14 which splits an input signal Si into a first signal S1 and a second signal S2; a control amplifier 10 which amplifies the first signal and outputs the amplified signal as a third signal S3; a second splitter 16 which splits the second signal into a fourth signal S4 and a fifth signal S5, which have different phases at the center frequency of the operating bandwidth; a first auxiliary amplifier 12a which amplifies the fourth signal and outputs the amplified signal as a sixth signal; a second auxiliary amplifier 12b which amplifies the fifth signal and outputs the amplified signal as a seventh signal; and a synthesizer 18, which is a branch-line coupler.SELECTED DRAWING: Figure 1

The invention discloses an S-band reflection type phase shifter based on a cross-direction coupling line coupler, and belongs to the field of wireless communication and digital signal processing, the reflection type phase shifter is designed based on the cross-direction coupling line coupler, and compared with an existing branch line coupler and an existing Lange coupler, the S-band reflection type phase shifter has the advantages of being small in size, low in insertion loss, wide in broadband and the like. A digital phase shifter used by a traditional phased-array antenna can be replaced, and the pain point problems of high cost, high power consumption and the like of the traditional phased-array antenna are solved; besides, the reflective phase shifter provided by the invention can be integrated on a PCB, has the advantages of being easy to process, low in cost, small in size and the like, is easy to integrate with a planar printing phased array antenna, and realizes miniaturization and low cost of the phased array antenna.