CN110365304B - Branch filter - Google Patents
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- CN110365304B CN110365304B CN201910694202.3A CN201910694202A CN110365304B CN 110365304 B CN110365304 B CN 110365304B CN 201910694202 A CN201910694202 A CN 201910694202A CN 110365304 B CN110365304 B CN 110365304B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H5/00—One-port networks comprising only passive electrical elements as network components
- H03H5/12—One-port networks comprising only passive electrical elements as network components with at least one voltage- or current-dependent element
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a branch filter device which comprises a shell, a filter device, a plurality of bias voltage sources and a first adjusting device, wherein the filter device and the bias voltage sources are arranged in the shell, the first adjusting device is arranged outside the shell and connected with the bias voltage sources, and the first adjusting device is connected with the bias voltage sources and used for adjusting the bias voltage of the bias voltage sources so that the filter device carries out filter processing on input signals under the action of the bias voltage applied by the bias voltage sources and outputs two signals with different phases.
Description
Technical Field
The present invention relates to wireless communication technology, and in particular, to a branching filter device.
Background
With the rapid development of modern wireless communication technology, branched filter networks are widely popularized in the wireless communication field, and become an indispensable part in the wireless communication field.
In the prior art, when the branch filter network is actually applied, the branch filter network needs to be actually operated, regulated and tested so as to achieve the expected effect, but workers in the field are not familiar with the technology in the field, when the parameters in the branch filter network are debugged, the workers in the field need to assist in debugging, the debugging process is complex, human resources are consumed, and the actual application is inconvenient.
Disclosure of Invention
The invention aims to provide a branch filter device aiming at the prior art and the problems thereof. The method solves the problems that the workers in the non-field are not familiar with the technology in the field, when parameters in the branch filter network are regulated and tested, the workers in the field are required to assist in debugging aside, and the process consumes human resources and is inconvenient.
The invention is realized by the following technical scheme:
a branching filter device comprises a shell, a filter device, a plurality of bias voltage sources and a first adjusting device, wherein the filter device and the bias voltage sources are arranged in the shell, the first adjusting device is arranged outside the shell,
the filtering device is connected with a plurality of bias voltage sources, and the first adjusting device is connected with a plurality of bias voltage sources and is used for adjusting the bias voltage of the bias voltage sources, so that the filtering device carries out filtering processing on an input signal under the action of the bias voltage applied by the bias voltage sources and outputs two signals with different phases.
Optionally, the filtering device comprises a first resonator, a second resonator, a third resonator, a fourth resonator and four varactors,
the first resonator, the second resonator, the third resonator and the fourth resonator are annularly distributed, two adjacent resonators are connected through one variable capacitance circuit, wherein each variable capacitance circuit is connected with one bias voltage source in the bias voltage sources to receive the bias voltage applied by the bias voltage source,
the first resonator and the fourth resonator are externally connected with input signals, and the four varactors are mutually matched with the four resonators to filter the input signals under the action of bias voltages applied by a plurality of bias voltage sources, so that two signals with different phases are output at the second resonator and the third resonator.
Optionally, the first resonator, the second resonator, the third resonator and the fourth resonator are microstrip line resonators, and the wider ends of the microstrip lines of the two adjacent resonators are connected through one of the capacitance-variable circuits.
Optionally, the branching filter device further comprises a second adjusting device, the second adjusting device is arranged outside the shell,
the filtering device further comprises four center frequency adjustment circuits, each resonator is connected with one center frequency adjustment circuit, wherein each center frequency adjustment circuit is connected with one bias voltage source of a plurality of bias voltage sources to receive bias voltage applied by the bias voltage source,
the second adjusting device is connected with a plurality of bias voltage sources and is used for adjusting bias voltage of the bias voltage sources, and the center frequency adjusting circuit is matched with the four resonators to adjust the center frequency of the input signal under the action of the applied bias voltage and outputs a signal different from the center frequency of the input signal.
Optionally, the narrower end of the microstrip line of each resonator is connected to one of said center frequency adjustment circuits.
Optionally, the branching filter device further comprises a signal input port and a signal output port, the signal input port and the signal output port are arranged outside the shell,
the signal input port and the signal output port are connected with the filtering device, and the filtering device inputs signals through the signal input port and outputs signals through the signal output port.
Optionally, the branching filter device further comprises a display device, the display device is arranged outside the shell,
the display device is connected with the filter device and is used for displaying the center frequencies of the input signals and the output signals in the filter device and displaying the phase difference between the output signals.
The invention has the following advantages:
the invention provides a branch filter device which comprises a shell, a filter device, a plurality of bias voltage sources and a first adjusting device, wherein the filter device and the bias voltage sources are arranged in the shell, and the first adjusting device is arranged outside the shell.
The filtering device is connected with a plurality of bias voltage sources, and the first adjusting device is connected with a plurality of bias voltage sources and is used for adjusting the bias voltage of the bias voltage sources so that the filtering device can filter the input signals under the action of the bias voltages applied by the bias voltage sources. In order to enable the operators in the non-field to directly adjust the bias voltage sources through adjusting the first adjusting device under the condition that the operators in the non-field are not clear in the field, so that the filtering device can achieve the target effect on the filtering processing of the input signals.
Drawings
Fig. 1 is a schematic structural diagram of a branching filter device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a filtering device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another branching filter device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another filtering device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third branching filter device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a third filtering device according to an embodiment of the present invention;
FIG. 7 is a diagram showing the results of testing S11 parameters according to an embodiment of the present invention;
FIG. 8 is a diagram showing the results of testing S21 parameters according to an embodiment of the present invention;
FIG. 9 is a diagram showing the results of testing S31 parameters according to an embodiment of the present invention;
FIG. 10 is a diagram showing the results of the S44 parameter test in the embodiment of the present invention;
FIG. 11 is a diagram showing the results of the S24 parameter test in the embodiment of the present invention;
FIG. 12 is a diagram showing the results of the S34 parameter test in the embodiment of the present invention;
FIG. 13 is a diagram showing the results of the S41 parameter test in the embodiment of the present invention;
FIG. 14 is a diagram showing the result of the phase imbalance test of the output signal according to the embodiment of the present invention;
FIG. 15 is a diagram showing a second example of the output signal phase imbalance test result according to the embodiment of the present invention.
Icon(s): 1-branch filtering means; 10-a housing; 20-filtering means; 21-a first resonator; 22-a second resonator; 23-a third resonator; 24-a fourth resonator; 25-a varactor circuit; 26-input port; 27-microstrip lines; 28-an output port; 291-center frequency adjustment circuit; 292-signal processing circuitry; 30-a bias voltage source; 40-a first adjusting device; 50-a second adjusting device; 60-signal input port; 70-a signal output port; 80-display device.
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 schematic structural diagram of a branching filter device provided in an embodiment of the present invention, where the branching filter device 1 includes a housing 10, a filter device 20, a plurality of bias voltage sources 30, and a first adjusting device 40, the filter device 20 and the bias voltage sources 30 are disposed inside the housing 1, and the first adjusting device 40 is disposed outside the housing 1.
The filtering device 20 is connected to a plurality of bias voltage sources 30, and the first adjusting device 40 is connected to a plurality of bias voltage sources 30, and is configured to adjust bias voltages of the bias voltage sources 30, so that the filtering device 20 performs filtering processing on an input signal under the action of bias voltages applied by the bias voltage sources 30, and outputs two signals with different phases.
Optionally, the housing 1 may be a hollow cuboid, or may be another hollow three-dimensional figure.
Alternatively, the first adjusting device 40 may be one or more rotary adjusting switches. The first adjusting means 40 is marked with a scale of adjustable value.
In the prior art, because workers in the non-field are not familiar with the technology in the field, when parameters in a branch filter network are regulated and tested, the workers in the field are required to assist in debugging aside, and the process consumes human resources and is inconvenient.
In the embodiment of the present invention, the first adjusting device 40 connected to the multiple bias voltage sources 30 is provided, and the multiple bias voltage sources 30 are adjusted by adjusting the first adjusting device 40, so that the multiple bias voltage sources 30 are directly adjusted by adjusting the first adjusting device 40 by a person who is not skilled in the art without knowing the skill in the art, so that the filtering processing of the input signal by the filtering device 20 achieves the target effect. The purpose of saving manpower is achieved, and the adjustment process of the bias voltage sources 30 is convenient and quick.
A person skilled in the art may adjust the first adjusting device 40 to a target value scale according to the scale marked with the adjustable value, so as to adjust the bias voltage sources 30, so that the filtering device 20 achieves the target effect on the filtering process of the input signal.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a filtering device according to an embodiment of the present invention, and the filtering device 20 includes a first resonator 21, a second resonator 22, a third resonator 23, a fourth resonator 24, and four varactors 25.
The first resonator 21, the second resonator 22, the third resonator 23, and the fourth resonator 24 are annularly distributed, and two adjacent resonators are connected through one varactor circuit 25, where each varactor circuit 25 is connected to one bias voltage source of the bias voltage sources 30 to receive a bias voltage applied by the bias voltage source 30.
The first resonator 21 and the fourth resonator 24 are externally connected with an input signal, and the four varactors 25 are mutually matched with the four resonators to filter the input signal under the action of bias voltages applied by the bias voltage sources 30, so that two signals with different phases are output at the second resonator 22 and the third resonator 23.
Optionally, the first resonator 21, the second resonator 22, the third resonator 23, and the fourth resonator 24 are microstrip line resonators, and the wider ends of the microstrip lines of the adjacent two resonators are connected through one of the varactor circuits 25.
Optionally, in the embodiment of the present invention, the first resonator 21, the second resonator 22, the third resonator 23, the fourth resonator 24, and the four varactors 25 are mounted on the same substrate, where in the embodiment of the present invention, the resonators use microstrip line resonators with characteristic impedance of 50 ohms, the microstrip line resonators include wider ends and narrower ends, the substrate uses a substrate with a model number Rogers6010, and the thickness of the substrate is 25 mils. Wherein the first resonator 21, the second resonator 22, the third resonator 23 and the fourth resonator 24 are grounded.
In the embodiment of the present invention, the staff may control the capacitance value of the varactor circuit 25 to increase so that capacitive coupling occurs between any two adjacent resonators, and at this time, any two adjacent resonators of the four resonators may be inductive coupling or capacitive coupling, so that the input signal outputs two signals with different phases from the second resonator 22 and the third resonator 23 through the cooperation between the four resonators and the four varactor circuits 25. 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 branch filtering process is convenient and quick, and the cost of extra signal phase processing is avoided.
The varactor circuit 25 in the embodiment of the present invention may include a varactor element and a first chip resistor R1 connected to the varactor element, where one end of the varactor circuit 25 far away from the varactor element is externally connected to a bias voltage source 30 through the first chip resistor R1, and the varactor element is connected to the wider ends of two adjacent resonators.
Alternatively, the varactor element may be a first diode D1 and a second diode D2 of a common cathode, where the cathodes of the first diode D1 and the second diode D2 of the common cathode are externally connected with the bias voltage source 30 through the first chip resistor R1, and two anodes of the first diode D1 and the second diode D2 of the common cathode are respectively connected with wider ends on two adjacent resonators.
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 is configured as two diodes with common cathodes, when the bias voltage is input to the varactor circuit 25, the voltage at the common cathodes of the two diodes is increased simultaneously, and the capacitance is increased, so that the current does not flow to the resonator due to the unidirectional conductivity of the diodes, and the filtering effect of the filtering network on the input signal is not affected.
Wherein the bias voltage source 30 is a dc bias voltage source. By controlling the bias voltage to increase, the voltage value at the cathodes of the first diode D1 and the second diode D2 increases, which in turn leads to an increase in the capacitance of the first diode D1 and the second diode D2, so that an electrical coupling is generated between the two resonators.
In the embodiment of the present invention, if the operator needs to obtain two signals with a phase difference of 180 °, a dc bias voltage source 30 is externally connected between the first resonator 21 and the third resonator 23 and between the second resonator 22 and the fourth resonator 24, and then the bias voltages between the two resonators are selected to be appropriate voltage values, so that magnetic coupling is generated between the first resonator 21 and the second resonator 22, and between the third resonator 23 and the fourth resonator 24, and electric coupling is generated between the first resonator 21 and the third resonator 23, and between the second resonator 22 and the fourth resonator 24, so that an input signal is input from the first resonator 21 and the fourth resonator 24, and two signals with a phase difference of 180 can be output from the second resonator 22 and the third resonator 23 through cooperation between the four resonators and the four variac circuits 25.
The specific inter-stage coupling coefficient relationship is as follows:
wherein M is 12 M is the coupling coefficient between the first resonator 21 and the second resonator 22 34 M is the coupling coefficient between the third resonator 23 and the fourth resonator 24 13 M is the coupling coefficient between the first resonator 21 and the third resonator 23 24 M is the coupling coefficient between the second resonator 22 and the fourth resonator 24 0 Is the coupling coefficient of the capacitive coupling between the two resonators.
Optionally, each diode in the embodiment of the present invention is a varactor diode with a model MA46H202, and each chip resistor in the embodiment of the present invention is a chip resistor with a model 0402 packaged 100 kiloohms.
Optionally, in this embodiment of the present invention, the first resonator 21 and the fourth resonator 24 are connected to a microstrip line 27 on an input port 26, the third resonator 23 and the fourth resonator 24 are connected to a microstrip line 27 on an output port 28, the first resonator 21 is externally connected to an input signal through the input port 26, and the second resonator 22 and the third resonator 23 output signals through the output port 28. Wherein the input port 26 and the output port 28 are welded SMA joints.
Alternatively, the first adjusting device 40 is marked with a value of 90 ° and 180 ° of phase difference, so that those skilled in the art can adjust the first adjusting device 40 to 180 °, under the action of the first adjusting device 40, the voltage sources between the first resonator 21 and the third resonator 23 and between the second resonator 22 and the fourth resonator 24 in the plurality of bias voltage sources 30 are increased, and further the bias voltages applied between the first resonator 21 and the third resonator 23 and between the second resonator 22 and the fourth resonator 24 are increased, so that capacitive coupling occurs between the first resonator 21 and the third resonator 23 and between the second resonator 22 and the fourth resonator 24, and the input signals are input from the first resonator 21 and the fourth resonator 24, and two signals with 180 ° of phase difference are output from the second resonator 22 and the third resonator 23.
In this embodiment of the present invention, a person skilled in the art may adjust the plurality of bias voltage sources 30 directly by adjusting the first adjusting device 40 according to the scale marked with the adjustable value on the first adjusting device 40, so as to raise the bias voltage between the first resonator 21 and the third resonator 23 and between the second resonator 22 and the fourth resonator 24, and the person skilled in the art may adjust the first adjusting device 40 to the target scale according to the scale marked with the adjustable value on the first adjusting device 40, thereby achieving the adjustment of the plurality of bias voltage sources 30, so as to achieve the target effect of the filtering processing of the input signal by the filtering device 20.
However, it is possible to select signals to be input from only the first resonator 21 or the fourth resonator 24, and to output signals from the second resonator 22 and the third resonator 23, and two signals having a phase difference of 180 ° can be obtained. The output signals obtained from the second resonator 22 and the third resonator 23 are identical, regardless of whether the first resonator 21 or the fourth resonator 24 receives the input signal. In the embodiment of the present invention, the first resonator 21 and the fourth resonator 24 are selected to input signals at the same time, and the signal strength of the two obtained output signals is about twice stronger than that of the signal obtained from one input signal of the first resonator 21 or the fourth resonator 24.
Referring to fig. 3 and fig. 4 in combination, fig. 3 is a schematic structural diagram of another branching filter device according to an embodiment of the present invention, and fig. 4 is a schematic structural diagram of another filter device according to an embodiment of the present invention.
In the embodiment of the present invention, the branching filter device further includes a second adjusting device 50, where the second adjusting device 50 is disposed outside the housing 10,
the filtering means 20 further comprises four center frequency adjustment circuits 291, one center frequency adjustment circuit 291 being connected to each resonator, wherein each center frequency adjustment circuit 291 is connected to one of the plurality of bias voltage sources 30, to receive the bias voltage applied by the bias voltage source 30,
the second adjusting device 50 is connected to the bias voltage sources 30, and is used for adjusting the bias voltage of the bias voltage sources 30, and the center frequency adjusting circuit 291 is used for adjusting the center frequency of the input signal in cooperation with the four resonators under the action of the applied bias voltage, and outputting a signal different from the center frequency of the input signal.
Optionally, the center frequency adjusting circuit 291 includes a third diode D3 and a fourth diode D4 that are commonly connected to the cathode, the cathodes of the third diode D3 and the fourth diode D4 are connected to the bias voltage source 30 through a second chip resistor R2, wherein the anode of the third diode D3 is connected to the narrower end of the resonator, and the anode of the fourth diode D4 is grounded.
Optionally, the filtering apparatus 20 further includes four signal processing circuits 292, where the narrower ends of the first resonator 21 and the fourth resonator 24 are respectively connected to an input signal via one signal processing circuit 292, and the signal processing circuits 292 are used for processing the input signal.
Optionally, the narrower ends of the second resonator 21 and the fourth resonator 24 are each output signals via a signal processing circuit 292, and the signal processing circuit 292 is further configured to process the output signals. So that the embodiments of the present invention can perform branch filtering processing on multiple types of signals.
In this embodiment of the present invention, optionally, the signal processing circuit 292 includes a fifth diode D5, a chip capacitor C1 connected to a cathode of the fifth diode D5, and a third chip resistor R3, where the signal processing circuit 292 is externally connected to the bias voltage source 30 through a cathode of the fifth diode D5, the signal processing circuit 292 is connected to a narrower end of the resonator through an anode of the fifth diode D5, and the signal processing circuit 292 outputs a signal through the chip capacitor C1 or is externally connected to the input signal.
Optionally, in the embodiment of the present invention, the chip capacitor C1 is a packaging chip capacitor with a model number 0402.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a third branching filter device according to an embodiment of the present invention. In the embodiment of the present invention, the branching filter apparatus 1 further includes a signal input port 60 and a signal output port 70, the signal input port 60 and the signal output port 70 are disposed outside the housing,
the signal input port 60 and the signal output port 70 are connected to the filter device 20, and the filter device 20 inputs a signal through the signal input port 60 and outputs a signal through the signal output port 70.
Optionally, the branching filter device 1 further comprises a display device 80, the display device 80 is disposed outside the housing 10,
the display device 80 is connected to the filtering device 20, and is configured to display the center frequencies of the input signal and the output signal in the filtering device 20, and also configured to display the phase difference between the output signals.
The display device 80 may be a liquid crystal display.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a third filtering device according to an embodiment of the invention.
The first resonator 21, the second resonator 22, the third resonator 23, and the fourth resonator 24 are all ladder impedance resonators. The stepped impedance resonator comprises a first rectangular microstrip line and a second rectangular microstrip line, wherein the short side of the second rectangular microstrip line is shorter than the short side of the first rectangular microstrip line, the long side of the second rectangular microstrip line is longer than the long side of the first rectangular microstrip line, the first rectangular microstrip line and the second rectangular microstrip line are spliced together in a short side connection mode, and one long side of the first rectangular microstrip line is flush with one long side of the second rectangular microstrip line.
Through design, simulation and optimization, the specific size of the filter formed by the branch filter network in the embodiment of the invention is finally determined as follows:
the length L1 of the first rectangular microstrip line in the resonator is 6 mm, the width W1 of the first rectangular microstrip line is 3.5 mm, the length L2 of the second rectangular microstrip line is 14 mm, the width W2 of the second rectangular microstrip line is 1 mm, the connection point of the narrower end of the first resonator 21 and the signal processing circuit 292 is located at 1.4 mm from the end L3 of the narrower end of the first resonator 21, the connection point of the narrower end of the second resonator 22 and the signal processing circuit 292 is located at 1.4 mm from the end L4 of the narrower end of the second resonator 22, the connection point of the narrower end of the third resonator 23 and the signal processing circuit 292 is located at 1.4 mm from the end L5 of the narrower end of the third resonator 23, the connection point of the narrower end of the fourth resonator 24 and the signal processing circuit 292 is located at 1.4 mm from the end L6 of the narrower end of the fourth resonator 24, the coupling distance S1 between the first resonator 21 and the second resonator 22 is located at 1.4 mm from the end L4 of the narrower end of the fourth resonator 24, and the coupling distance S1 between the third resonator 23 and the fourth resonator is 1 mm.
Please refer to fig. 7 to 15. Fig. 15 to 13 respectively show the coupling parameters of the branch line filter network when the capacitance of the varactor diode is different by changing the bias voltage according to the embodiment of the present invention: s11 parameter, S21 parameter, S31 parameter, S44 parameter, S24 parameter, S34 parameter, S41 parameter, and output signal phase unbalance degree test results, 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 branching filter device, which includes a housing, a filter device, a plurality of bias voltage sources and a first adjusting device, wherein the filter device and the bias voltage sources are disposed inside the housing, the first adjusting device is disposed outside the housing,
the filtering device is connected with a plurality of bias voltage sources, and the first adjusting device is connected with a plurality of bias voltage sources and is used for adjusting the bias voltage of the bias voltage sources, so that the filtering device carries out filtering processing on an input signal under the action of the bias voltage applied by the bias voltage sources and outputs two signals with different phases. In order to enable the operators in the non-field to directly adjust the bias voltage sources through adjusting the first adjusting device under the condition that the operators in the non-field are not clear in the field, so that the filtering device can achieve the target effect on the filtering processing of the input signals.
Further, the branching filter device further comprises a second adjusting device, the second adjusting device is arranged on the outer side of the shell, the filter device further comprises four center frequency adjusting circuits, each resonator is connected with one center frequency adjusting circuit, each center frequency adjusting circuit is connected with one bias voltage source of the bias voltage sources to receive bias voltage applied by the bias voltage source, the second adjusting device is connected with the bias voltage sources and is used for adjusting bias voltage of the bias voltage source, and the center frequency adjusting circuits are mutually matched with the four resonators to adjust center frequency of the input signal under the action of the applied bias voltage and output signals different from the center frequency of the input signal.
In order to enable the non-skilled staff to directly adjust the bias voltage sources through adjusting the second adjusting device under the condition that the non-skilled staff does not know the technology in the prior art, so that the center frequency of the input signal is processed by the filtering device to achieve the target effect.
Claims (6)
1. A branching filter device is characterized by comprising a shell, a filter device, a plurality of bias voltage sources and a first adjusting device, wherein the filter device and the bias voltage sources are arranged in the shell, the first adjusting device is arranged outside the shell,
the filtering device is connected with a plurality of bias voltage sources, the first adjusting device is connected with a plurality of bias voltage sources and is used for adjusting the bias voltage of the bias voltage sources, so that the filtering device carries out filtering processing on input signals and outputs two signals with different phases under the action of the bias voltage applied by the bias voltage sources, the filtering device comprises a first resonator, a second resonator, a third resonator, a fourth resonator and four capacitance-changing circuits,
the first resonator, the second resonator, the third resonator and the fourth resonator are annularly distributed, two adjacent resonators are connected through one variable capacitance circuit, wherein each variable capacitance circuit is connected with one bias voltage source in the bias voltage sources to receive the bias voltage applied by the bias voltage source,
the first resonator and the fourth resonator are externally connected with input signals, and the four variable capacitance circuits are mutually matched with the four resonators to carry out filtering processing on the input signals under the action of bias voltages applied by a plurality of bias voltage sources, so that two signals with different phases are output at the second resonator and the third resonator; wherein each resonator includes a wider end and a narrower end.
2. The branching filter device according to claim 1, wherein the first resonator, the second resonator, the third resonator and the fourth resonator are microstrip line resonators, and microstrip line wider ends of two adjacent resonators are connected by one of the varactors.
3. The branching filter device according to claim 1, further comprising a second adjusting device provided outside the housing,
the filtering device further comprises four center frequency adjustment circuits, each resonator is connected with one center frequency adjustment circuit, wherein each center frequency adjustment circuit is connected with one bias voltage source of a plurality of bias voltage sources to receive bias voltage applied by the bias voltage source,
the second adjusting device is connected with a plurality of bias voltage sources and is used for adjusting bias voltage of the bias voltage sources, and the center frequency adjusting circuit is matched with the four resonators to adjust the center frequency of the input signal under the action of the applied bias voltage and outputs a signal different from the center frequency of the input signal.
4. A branching filter arrangement as claimed in claim 3, wherein the narrower end of the microstrip line of each resonator is connected to one of the centre frequency adjustment circuits.
5. The branching filter device according to claim 1, further comprising a signal input port and a signal output port, the signal input port and the signal output port being provided outside the housing,
the signal input port and the signal output port are connected with the filtering device, and the filtering device inputs signals through the signal input port and outputs signals through the signal output port.
6. The branching filter apparatus of claim 1, further comprising a display device disposed outside the housing,
the display device is connected with the filter device and is used for displaying the center frequencies of the input signals and the output signals in the filter device and displaying the phase difference between the output signals.
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