CN110518892B - Orthogonal filter device - Google Patents
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- CN110518892B CN110518892B CN201910716635.4A CN201910716635A CN110518892B CN 110518892 B CN110518892 B CN 110518892B CN 201910716635 A CN201910716635 A CN 201910716635A CN 110518892 B CN110518892 B CN 110518892B
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
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Abstract
The invention provides a quadrature filtering method and a quadrature filtering device, wherein the method comprises the following steps: inputting a signal to the first SIW resonator; the capacitance values of the variable capacitance circuits between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator are adjusted to be preset capacitance values, so that the first SIW resonator and the third SIW resonator and the second SIW resonator and the fourth SIW resonator are coupled in a capacitance mode; signals are output from the third and fourth SIW resonators. When two orthogonal signals are required to be acquired, the two orthogonal signals can be directly acquired, so that the total filtering process is convenient and quick, and the cost of additional signal filtering processing is avoided.
Description
Technical Field
The present invention relates to wireless communication technology, and in particular, to a quadrature filtering apparatus.
Background
The functions of the electronic systems on the existing weapon equipment platforms such as warships, satellites, fighters and missiles tend to be complicated, and various technical and tactical tasks such as reconnaissance, interference, detection, communication, identification of enemy, navigation and the like need to be completed. However, the electronic systems at the present stage are separated from each other, which makes the electronic devices on each platform have the disadvantages of redundancy, large volume and heavy weight, high cost, inconvenience for stealth, and great resource consumption because each device needs to have respective operators and maintenance. The integrated electronic information system is a new generation multifunctional integrated electronic information system which is built by adopting a top-down design method and integrates detection, interference and detection functions in a single-platform electronic information system or a multi-platform electronic information system, integrates multiple functions such as detection, drying, detection and communication through technical approaches such as optimal configuration, resource reconstruction, signal multiplexing and collaborative enhancement, fully exerts the resource potential of each system in the system, realizes resource intensification and function library enhancement, and remarkably improves the independent information combat capability of the single platform and the information combat capability of the multi-platform system.
In the prior art, the coupler is too much dependent on different electrical lengths of the microstrip line to realize the orthogonal signal output function, but only realizes the orthogonal signal output function through the different electrical lengths of the microstrip line, and additionally performs filtering processing on signals in the subsequent orthogonal signal acquisition process, so that the total process of acquiring signals of a target phase difference is complex and inconvenient, and the cost of additionally performing filtering processing on the signals is required.
Disclosure of Invention
In view of the prior art and the problems thereof, an object of the present invention is to provide a quadrature filtering device. The method solves the problems that in the prior art, when orthogonal signals are acquired, the signals are required to be additionally filtered in the total filtering process, so that the total filtering process is complex and inconvenient.
The invention is realized by the following technical scheme:
the orthogonal filtering method is applied to an orthogonal filtering device comprising a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactor circuits, wherein the first SIW resonator, the second SIW resonator, the third SIW resonator and the fourth SIW resonator are annularly distributed, and two adjacent SIW resonators are connected through one varactor circuit;
the method comprises the following steps:
inputting a signal to the first SIW resonator;
the capacitance values of the variable capacitance circuits between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator are adjusted to be preset capacitance values, so that the first SIW resonator and the third SIW resonator and the second SIW resonator and the fourth SIW resonator are coupled in a capacitance mode;
signals are output from the third and fourth SIW resonators.
A quadrature filter device comprises a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactor circuits;
the first SIW resonators, the second SIW resonators, the third SIW resonators and the fourth SIW resonators are distributed in a ring shape, two adjacent SIW resonators are connected through one variable capacitance circuit, the first SIW resonators are externally connected with input signals, so that the input signals are matched with the four variable capacitance circuits through the four SIW resonators, and two signals with different phases are output from the third SIW resonators and the fourth SIW resonators.
Optionally, each SIW resonator is of a hollow tubular structure, one side of each SIW resonator is provided with a piezoelectric brake, and the piezoelectric brake and the SIW resonator form a cavity structure;
each piezoelectric brake is externally connected with a bias voltage, so that under the action of the bias voltage, the piezoelectric brake moves relative to the SIW resonator to influence the size of the cavity structure, and then the center frequency of the input signal is adjusted.
Optionally, the piezoelectric actuator is connected with the SIW resonator through conductive silver paste.
Optionally, the piezoelectric brake is a piezoelectric ceramic brake.
Optionally, the varactor circuit includes the varactor element, and with the first chip resistor that the varactor element is connected, the varactor circuit is through first chip resistor keeps away from the external offset voltage of one end of varactor element, wherein, the varactor element is connected with the one end on two adjacent SIW resonators.
Optionally, the varactor is a first diode and a second diode of a common cathode, cathodes of the first diode and the second diode of the common cathode are externally connected with bias voltage through a chip resistor, and two anodes of the first diode and the second diode of the common cathode are respectively connected with one ends of two adjacent SIW resonators.
Optionally, the quadrature filtering device further comprises three signal transmission circuits;
the other end of the first SIW resonator is externally connected with an input signal through one signal transmission circuit, and the signal transmission circuit is used for reducing return loss of signal input.
Optionally, the third SIW resonator and the fourth SIW resonator each output a signal via one of the signal transmission circuits, and the signal transmission circuits are further configured to reduce return loss of the signal output.
Optionally, the signal transmission circuit includes a third diode and a fourth diode of a common cathode, wherein cathodes of the third diode and the fourth diode of the common cathode are externally connected with bias voltage through a second chip resistor, one ends of anodes of the third diode and the fourth diode of the common cathode are connected with one end of the resonator, and the other ends of anodes of the third diode and the fourth diode of the common cathode output signals or are externally connected with the input signals.
The invention has the following advantages:
the invention provides a quadrature filtering method which is characterized by being applied to a quadrature filtering device comprising a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactor circuits, wherein the first SIW resonator, the second SIW resonator, the third SIW resonator and the fourth SIW resonator are annularly distributed, and two adjacent SIW resonators are connected through one varactor circuit; the method comprises the following steps: inputting a signal to the first SIW resonator; the capacitance values of the variable capacitance circuits between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator are adjusted to be preset capacitance values, so that the first SIW resonator and the third SIW resonator and the second SIW resonator and the fourth SIW resonator are coupled in a capacitance mode; signals are output from the third and fourth SIW resonators. When two orthogonal signals are required to be obtained, the two orthogonal signals can be directly obtained by the method, so that the total filtering process is convenient and quick, and the additional cost of filtering the signals is avoided.
Drawings
Fig. 1 is a schematic flow chart of a quadrature filtering method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a quadrature filtering device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another quadrature filtering apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third quadrature filtering apparatus according to an embodiment of the present invention;
fig. 5a is an S-parameter test chart (S31, S41) of the quadrature filter according to an embodiment of the present invention;
fig. 5b is an S-parameter test chart (S11, S21) of the quadrature filter according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a phase imbalance test of an output signal of a quadrature filter according to an embodiment of the present invention.
Icon: 1-quadrature filtering means; 10-a first SIW resonator; 20-a second SIW resonator; 30-a third SIW resonator; 40-fourth SIW resonator; 50-a varactor circuit; 51-a varactor element; 511-a first diode; 512-a second diode; 52-a first chip resistor; 53-bias voltage; 60-a substrate; 61-copper foil; 70-a signal transmission circuit; 71-a third diode; 72-fourth diode; 73-a second chip resistor; 80-piezoelectric brake.
Detailed Description
The present invention will be described in further detail with reference to the following examples and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Referring to fig. 1, fig. 1 is a flow chart of a quadrature filtering method according to an embodiment of the invention. The orthogonal filtering method is applied to an orthogonal filtering device comprising a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactor circuits, wherein the first SIW resonator, the second SIW resonator, the third SIW resonator and the fourth SIW resonator are annularly distributed, and two adjacent SIW resonators are connected through one varactor circuit. The specific flow of the quadrature filtering method is described in detail below.
Step S110, inputting a signal to the first SIW resonator.
In the embodiment of the invention, the signal is input to the first SIW resonator, and the signal is input to the whole filtering device through the first SIW resonator, so that the filtering device performs filtering processing on the input signal.
Step S120, adjusting the capacitance values of the varactor circuit between the first SIW resonator and the third SIW resonator, and between the second SIW resonator and the fourth SIW resonator to a preset capacitance value.
In the embodiment of the invention, the capacitance value of the variable capacitance circuit between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator is adjusted to be a preset capacitance value. The preset capacitance value is a capacitance value required by capacitive coupling between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator. So that the first and third SIW resonators, the second and fourth SIW resonators are capacitively coupled.
Alternatively, the capacitance value of any one of the varactors may be adjusted to a preset capacitance value, so that capacitive coupling occurs between two adjacent SIW resonators.
Step S130, outputting signals from the third SIW resonator and the fourth SIW resonator.
In an embodiment of the present invention, signals are output from the third SIW resonator and the fourth SIW resonator, and processed output signals are obtained from the third SIW resonator and the fourth SIW resonator. Wherein the input signal outputs two signals with 90 DEG phase from the third SIW resonator and the fourth SIW resonator through the cooperation between the four SIW resonators and the four varactors.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a quadrature filtering device according to an embodiment of the present invention. The quadrature filter device 1 includes a first SIW resonator 10, a second SIW resonator 20, a third SIW resonator 30, a fourth SIW resonator 40, and four varactors 50;
the first SIW resonator 10, the second SIW resonator 20, the third SIW resonator 30, and the fourth SIW resonator 40 are distributed in a ring shape, two adjacent SIW resonators are connected by one of the varactors 50, the first SIW resonator 10 is externally connected with an input signal, so that the input signal outputs two signals with different phases from the third SIW resonator 30 and the fourth SIW resonator 40 through the cooperation between the four SIW resonators and the four varactors 50.
Alternatively, four resonators and four varactors 50 in the embodiment of the present invention are mounted on the same substrate 60, where the resonators in the embodiment of the present invention are SIW evanescent mode resonators based on substrate integrated waveguides, the four resonators are connected to the varactors 50 through micro strips, the substrate 60 is a substrate of the type Rogers4350B, the thickness of the substrate 60 is 60 mils, where the substrate 60 is further provided with a signal input port and a signal output port, where the signal input port and the signal output port are respectively provided with SMA connectors, the coplanar waveguides on the first SIW resonator 10 are connected to SMA connectors on the signal input port, and the coplanar waveguides on the third SIW resonator 30 and the fourth SIW resonator 40 are connected to SMA connectors on the signal output port.
In the prior art, the coupler is too much dependent on different electrical lengths of the microstrip line to realize the orthogonal signal output function, but only realizes the orthogonal signal output function through the different electrical lengths of the microstrip line, and additionally performs filtering processing on signals in the subsequent orthogonal signal acquisition process, so that the total process of acquiring signals of a target phase difference is complex and inconvenient, and the cost of additionally performing filtering processing on the signals is required.
In the embodiment of the present invention, a worker may control the capacitance value of the varactor circuit 50 to change so that capacitive coupling occurs between any two adjacent SIW resonators, and at this time, any two adjacent SIW resonators of the four SIW resonators may be inductive coupling or capacitive coupling, so that an input signal outputs two signals with different phases from the third SIW resonator 30 and the fourth SIW resonator 40 through the cooperation between the four SIW resonators and the four varactor circuit 50. Wherein the phase of the two signals, and the phase difference between the two signals, can be controlled by the staff. So that the total process of obtaining the signals of the target phase difference is convenient and quick, and the cost of additionally carrying out filtering processing on the signals is avoided.
Alternatively, each SIW resonator may output a signal, an external input signal, and a connection signal terminal.
In the embodiment of the present invention, the varactor circuit 50 includes a varactor element 51 and a first chip resistor 52 connected to the varactor element 51, and one end of the varactor circuit 50 far away from the varactor element 51 is externally connected with a bias voltage 53 through the first chip resistor 52, where the varactor element 51 is connected to one end of two adjacent SIW resonators.
Optionally, the varactor 51 is connected to the microstrip on two adjacent SIW resonators.
Optionally, the varactor 51 is a first diode 511 and a second diode 512 with common cathodes, the cathodes of the first diode 511 and the second diode 512 with common cathodes are externally connected with a bias voltage 53 through a first chip resistor 52, and two anodes of the first diode 511 and the second diode 512 with common cathodes are respectively connected with one end of two adjacent SIW resonators.
In an embodiment of the present invention, optionally, the first diode 511 may be a diode labeled C9, C11, C13, and C15; the second diode 512 may be a diode labeled C10, C12, C14, C16; the first chip resistor 52 may be resistors denoted by R5, R6, R7, R8.
Optionally, a slot is formed on the substrate 60, a SIW resonator is connected through copper plating on the substrate 60 to realize capacitive load, a branch is added on the capacitive load, a through hole on the substrate is punched at the other end of the branch to be connected to a varactor on the other surface of the SIW resonator opposite to the substrate 60, and interstage inductive coupling and capacitive coupling switching and adjustment are realized.
If the varactor element is not two diodes with common cathode, the filtering effect of the filtering network on the input signal is easily affected when the bias voltage is input to the varactor circuit. In the embodiment of the present invention, the varactor element 51 is configured as two diodes with common cathodes, when the bias voltage 53 is input to the varactor circuit 50, the voltage at the common cathode of the two diodes is increased at the same time, and the capacitance is increased, so that the current does not flow to the SIW resonator due to the unidirectional conductivity of the diodes, and thus the filtering effect of the quadrature filter device 1 is not affected.
The bias voltage 53 is a dc bias voltage. By controlling the bias voltage 53 to increase, the voltage value at the cathodes of the first diode 511 and the second diode 512 increases, which in turn causes the capacitance of the first diode 511 and the second diode 512 to increase, so that capacitive coupling is generated between the two SIW resonators.
Optionally, each diode in the embodiment of the present invention is a varactor diode with a model MA46H201, and each chip resistor in the embodiment of the present invention is a chip resistor with a model 0402 packaged 100 kiloohms.
In the embodiment of the present invention, when a worker needs to obtain two signals with a phase difference of 90 ° so that magnetic coupling is generated between the outputs of the first SIW resonator 10 and the second SIW resonator 20, the third SIW resonator 30 and the fourth SIW resonator 40, and electrical coupling is generated between the first SIW resonator 10 and the third SIW resonator 30, and between the second SIW resonator 20 and the fourth SIW resonator 40, so that two signals with a phase difference of 90 ° can be output from the third SIW resonator 30 and the fourth SIW resonator 40 through the cooperation between the four SIW resonators and the four varactor circuits 50.
The specific coupling coefficient relation between two adjacent resonators is as follows: f12=f34= -f0, f13=f24=f0, where F12 is the coupling coefficient between the first SIW resonator 10 and the second SIW resonator 20, F34 is the coupling coefficient between the third SIW resonator 30 and the fourth SIW resonator 40, F13 is the coupling coefficient between the first SIW resonator 10 and the third SIW resonator 30, F24 is the coupling coefficient between the second SIW resonator 20 and the fourth SIW resonator 40, F0 is the coupling coefficient when capacitive coupling occurs between two adjacent SIW resonators, and-F0 is the coupling coefficient when inductive coupling occurs between two adjacent SIW resonators.
Optionally, the quadrature filtering device in the embodiment of the present invention further includes three signal transmission circuits 70;
the first SIW resonator 10 is externally connected with an input signal through one of the signal transmission circuits 70, and the signal transmission circuit 70 is used for reducing the return loss of the signal input.
The third SIW resonator 30 and the fourth SIW resonator 40 each output a signal via one of the signal transmission circuits 70, and the signal transmission circuits 70 are also used to reduce return loss of the signal output.
Optionally, the signal transmission circuit 70 includes a third diode 71 and a fourth diode 72 with a common cathode, where the cathodes of the third diode 71 and the fourth diode 72 with the common cathode are externally connected with the bias voltage 53 through a second chip resistor 73, one ends of anodes of the third diode 71 and the fourth diode 72 with the common cathode are connected with one end of the resonator, and the other ends of anodes of the third diode 71 and the fourth diode 72 with the common cathode output signals or are externally connected with the input signals.
According to the embodiment of the invention, the capacity coupling between the resonator and the signal input end and between the resonator and the signal output end can be controlled by adjusting the bias voltage, so that the coupling strength between the resonator and the signal input end and between the resonator and the signal output end is promoted, and the return loss of signal input or output is further reduced.
In the embodiment of the present invention, the third diode 71 may be optional, and may be the diodes denoted by C1, C3, C5, and C7; fourth diode 72 may be a diode labeled C10, C12, C14, C16; the second chip resistor 73 may be resistors denoted by R5, R6, R7, R8.
Referring to fig. 3 in combination, fig. 3 is a schematic structural diagram of another quadrature filtering apparatus according to an embodiment of the present invention. A copper foil 61 is coated on the substrate 60, and four piezoelectric actuators are mounted on the substrate 60 through the copper foil 31.
Each SIW resonator is of a hollow tubular structure, one side of each SIW resonator is provided with a piezoelectric brake 80, and the piezoelectric brake 80 and the SIW resonators form a cavity structure.
Each piezoelectric brake 80 is externally connected with a bias voltage 53, so that the piezoelectric brake 80 moves relative to the SIW resonator under the action of the bias voltage 53, the size of the cavity structure is affected, and the center frequency of the input signal is adjusted. Thereby adjusting the frequency of the quadrature filter network 1.
Alternatively, each SIW resonator is bonded to the piezoelectric actuator 80 by conductive silver paste.
Alternatively, the piezoelectric actuator 80 in the embodiment of the present invention is a ceramic actuator.
Alternatively, the piezoelectric brake 80 of the embodiment of the present invention employs a type T216-A4NO-05 piezoelectric brake.
In the prior art, the filter system has complicated structure and oversized size, so that the filter system has remarkable energy consumption and does not accord with the mainstream trend of miniaturization, integration and low energy consumption of the current transceiving front-end circuit.
In the embodiment of the present invention, by adopting SIW resonators, the quadrature filter device 1 in the embodiment of the present invention is a microwave passive network, and by disposing a piezoelectric brake 80 on one side of each SIW resonator, the piezoelectric brake 80 and the SIW resonators form a cavity structure. Each piezoelectric brake is externally connected with a bias voltage 53, so that the piezoelectric brake 80 moves relative to the SIW resonator under the action of the bias voltage 53, the size of the cavity structure is affected, and the center frequency of the input signal is adjusted. So that the quadrature filter device 1 has the function of flexibly adjusting the frequency and accords with the main trend of miniaturization, integration and low energy consumption of the current transceiving front-end circuit.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a third quadrature filtering apparatus according to an embodiment of the present invention. Through design, simulation and optimization, the specific dimensions of the filter formed by the orthogonal filter device 1 in the embodiment of the invention are finally determined as follows:
the shorter side length L1 of the substrate 60 is 45.1 mm, the longer side length L2 of the substrate 60 is 46.1mm, the height H1 of the substrate 60 is 1.524 mm, the diameter D1 of the resonator cavity is 12 mm, the height H2 of the resonator cavity is 20 microns, the diameter D2 of the capacitive load in the resonator is 4mm, and the length L3 of the microstrip in the resonator is 2.56 microns.
Please refer to fig. 5 to fig. 6. Fig. 5 to 6 respectively show the test results of the S parameter and the output signal phase imbalance degree of the quadrature filter device 1 by changing the bias voltage 53, and the positive-displacement diode, when the positive-displacement diode is at different positive-displacement values, and when each piezoelectric brake 80 is at different biases, the test results show that the design concept of the invention is correct and feasible.
In summary, the embodiment of the present invention provides a quadrature filtering method, which is characterized in that the quadrature filtering method is applied to a quadrature filtering device including a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactors, where the first SIW resonator, the second SIW resonator, the third SIW resonator and the fourth SIW resonator are annularly distributed, and two adjacent SIW resonators are connected through one varactor circuit; the method comprises the following steps: inputting a signal to the first SIW resonator; the capacitance values of the variable capacitance circuits between the first SIW resonator and the third SIW resonator and between the second SIW resonator and the fourth SIW resonator are adjusted to be preset capacitance values, so that the first SIW resonator and the third SIW resonator and the second SIW resonator and the fourth SIW resonator are coupled in a capacitance mode; signals are output from the third and fourth SIW resonators. When two orthogonal signals are required to be acquired, the two orthogonal signals can be directly acquired, so that the total filtering process is convenient and quick, and the cost of additional signal filtering processing is avoided.
Further, the quadrature filter device includes a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator, and four varactors;
the first SIW resonators, the second SIW resonators, the third SIW resonators and the fourth SIW resonators are distributed in a ring shape, two adjacent SIW resonators are connected through one variable capacitance circuit, the first SIW resonators are externally connected with input signals, so that the input signals are matched with the four variable capacitance circuits through the four SIW resonators, and two signals with different phases are output from the third SIW resonators and the fourth SIW resonators. So that the total process of orthogonal filtering is convenient and quick, and the cost of additional signal filtering processing is avoided.
Further, each SIW resonator is of a hollow tubular structure, one side of each SIW resonator is provided with a piezoelectric brake, and the piezoelectric brake and the SIW resonators form a cavity structure; each piezoelectric brake is externally connected with a bias voltage, so that under the action of the bias voltage, the piezoelectric brake moves relative to the SIW resonator to influence the size of the cavity structure, and then the center frequency of the input signal is adjusted.
Further, the quadrature filtering device further comprises three signal transmission circuits; the other end of the first SIW resonator is externally connected with an input signal through one signal transmission circuit, and the signal transmission circuit is used for improving the efficiency of signal input. The third SIW resonator and the fourth SIW resonator respectively output signals through one signal transmission circuit, and the signal transmission circuit is also used for improving the efficiency of signal output. Therefore, the bias voltage between the SIW resonator and the signal transmission circuit is adjusted, capacitive coupling is generated between the SIW resonator and the signal input end and between the SIW resonator and the signal output end, the coupling strength between the SIW resonator and the signal input end and between the SIW resonator and the signal output end is promoted, and the return loss of signal input or signal output is further reduced.
The above embodiments are only preferred embodiments and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The quadrature filter device is characterized by comprising a first SIW resonator, a second SIW resonator, a third SIW resonator, a fourth SIW resonator and four varactor circuits;
the first SIW resonator, the second SIW resonator, the third SIW resonator and the fourth SIW resonator are annularly distributed, two adjacent SIW resonators are connected through one variable capacitance circuit, the first SIW resonator is externally connected with an input signal, so that the input signal is matched with the four variable capacitance circuits through the four SIW resonators, and two signals with different phases are output from the third SIW resonator and the fourth SIW resonator;
each SIW resonator is of a hollow tubular structure, one side of each SIW resonator is provided with a piezoelectric brake, and the piezoelectric brake and the SIW resonators form a cavity structure;
each piezoelectric brake is externally connected with a bias voltage, so that under the action of the bias voltage, the piezoelectric brake moves relative to the SIW resonator to influence the size of the cavity structure, and the center frequency of the input signal is adjusted;
the piezoelectric brake is connected with the SIW resonator through conductive silver paste;
the piezoelectric brake is a piezoelectric ceramic brake;
the variable capacitance circuit comprises a variable capacitance element and a first patch resistor connected with the variable capacitance element, wherein the variable capacitance circuit is externally connected with bias voltage through one end of the first patch resistor, which is far away from the variable capacitance element, and the variable capacitance element is connected with one end of two adjacent SIW resonators.
2. The quadrature filter device of claim 1, wherein the varactor element is a first diode and a second diode of a common cathode, cathodes of the first diode and the second diode of the common cathode are externally connected with bias voltages through chip resistors, and two anodes of the first diode and the second diode of the common cathode are respectively connected with one end of two adjacent SIW resonators.
3. The quadrature filter arrangement of claim 1, wherein the quadrature filter arrangement further comprises three signal transmission circuits;
the other end of the first SIW resonator is externally connected with an input signal through one signal transmission circuit, and the signal transmission circuit is used for reducing return loss of signal input.
4. The quadrature filter of claim 3 wherein the third SIW resonator and the fourth SIW resonator each output a signal via one of the signal transmission circuits, the signal transmission circuits further configured to reduce return loss of the signal output.
5. The quadrature filter device according to claim 3, wherein the signal transmission circuit comprises a third diode and a fourth diode which are connected in common, wherein the cathodes of the third diode and the fourth diode are externally connected with a bias voltage through a second chip resistor, one ends of anodes of the third diode and the fourth diode which are connected in common are connected with one end of the SIW resonator, and the other ends of anodes of the third diode and the fourth diode which are connected in common are connected with the input signal in an external mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716635.4A CN110518892B (en) | 2019-08-05 | 2019-08-05 | Orthogonal filter device |
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| US10033084B2 (en) * | 2014-11-10 | 2018-07-24 | The Regents Of The University Of California | Operation frequency band customizable and frequency tunable filters with EBG substrates |
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