CN114464973A - Reconfigurable filter attenuator based on continuously adjustable center frequency - Google Patents
Reconfigurable filter attenuator based on continuously adjustable center frequency Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/08—Strip line resonators
- H01P7/088—Tunable resonators
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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
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- 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
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a reconfigurable filter attenuator based on continuously adjustable center frequency, which comprises a substrate and a filter power dividing module constructed on the substrate; the filtering power dividing module comprises three microstrip resonators distributed in parallel at intervals, one end of each microstrip resonator is connected with a resonance adjusting unit for adjusting the resonance frequency of the microstrip resonator, and a coupling adjusting unit for adjusting the coupling state between the two adjacent microstrip resonators is connected between the two microstrip resonators; the microstrip resonator in the middle is connected with the first port through a port microstrip line, and the two microstrip resonators on two sides are respectively connected with an output microstrip line. The reconfigurable filter attenuator can realize the flexible reconfiguration of the center frequency while realizing the continuous adjustment of the pass band amplitude, thereby effectively enhancing the flexibility of the system.
Description
Technical Field
The invention relates to a signal processing device in a wireless communication system, in particular to a reconfigurable filter attenuator based on continuously adjustable center frequency.
Background
The attenuator is used as a signal amplitude control device and widely applied to various communication, radars and test systems. For example, in phased array systems, attenuators are often used to adjust the amplitude ratio between the signal paths to achieve the beamforming function. As a frequency selection device, the band pass filter is also an important component of the communication system, and is often used to select the system operating frequency and filter out clutter interference. The attenuator and the filter are integrated, so that the system size can be effectively reduced, and the system manufacturing cost is reduced.
At present, a plurality of feasible composite design schemes of the filter attenuator appear in the prior art, including a graphene loading design scheme and a distributed digital switching design scheme. However, the existing filter attenuator can only work at a fixed frequency, and it is difficult to meet the performance requirements of modern communication systems and radar detection systems for multiple frequencies and multiple modes of devices. In addition, in the prior art that can realize the function of the filter attenuator, various different device products are usually directly combined, which is not favorable for miniaturization and integration design.
Disclosure of Invention
The present invention is directed to at least partially solve the above problems in the prior art, and provides a novel reconfigurable filter attenuator with continuously adjustable center frequency, which can achieve flexible reconfiguration of the center frequency while achieving continuous adjustment of the passband amplitude, thereby effectively enhancing the system flexibility.
The invention provides a reconfigurable filter attenuator based on continuous adjustable center frequency, which comprises a substrate and a filtering power division module constructed on the substrate;
the filtering power dividing module comprises three microstrip resonators distributed in parallel at intervals, one end of each microstrip resonator is connected with a resonance adjusting unit for adjusting the resonance frequency of the microstrip resonator, and a coupling adjusting unit for adjusting the coupling state between the two adjacent microstrip resonators is connected between the two microstrip resonators;
the microstrip resonator in the middle is connected with the first port through a port microstrip line, and the two microstrip resonators on two sides are respectively connected with an output microstrip line.
Preferably, each microstrip resonator comprises a narrow microstrip line and a wide microstrip line, and the narrow microstrip line and the wide microstrip line are connected to form a step impedance resonator.
Preferably, each resonance adjusting unit includes a first varactor diode and a first fixed capacitor, one end of the first fixed capacitor is connected to the end of the narrow microstrip line of the corresponding microstrip resonator, the other end of the first fixed capacitor is connected to the cathode of the first varactor diode, and the anode of the first varactor diode is grounded.
Preferably, each of the coupling adjusting units includes two second varactors, and the two second varactors are connected in series between the wide microstrip lines of two adjacent microstrip resonators in a cathode-to-back connection manner.
Preferably, an impedance matching unit is connected between the narrow microstrip line of the microstrip resonator located in the middle and the port microstrip line, an impedance matching unit is connected between the wide microstrip line of the two microstrip resonators located on the two sides and the output microstrip line, each impedance matching unit includes a third varactor and a second fixed capacitor, an anode of the third varactor is connected to the corresponding narrow microstrip line, and a cathode of the third varactor is connected to the second fixed capacitor.
Preferably, the narrow microstrip line of the microstrip resonator in the middle is close to the narrow microstrip line of the microstrip resonator on one side, so that in a power-on state, magnetic coupling can be formed between the microstrip resonator in the middle and the microstrip resonator on the one side; the narrow microstrip line of the microstrip resonator in the middle is far away from the narrow microstrip line of the microstrip resonator on the other side, so that energy cannot be transferred between the microstrip resonator in the middle and the microstrip resonator on the other side through magnetic coupling in a power-on state.
Preferably, in each resonance adjusting unit, a bias circuit is loaded between the first varactor diode and the first fixed capacitor; in each coupling adjusting unit, a bias circuit is loaded between two second variable capacitance diodes; in each impedance matching unit, a bias circuit is loaded between the third varactor diode and the second fixed capacitor.
Preferably, the wide microstrip line of each microstrip resonator is connected with a ground resistor.
Preferably, the wideband balun module further comprises a wideband phase shift unit and a wilkinson power divider, the wideband phase shift unit comprises a first transmission path and a second transmission path, two ends of the first transmission path and two ends of the second transmission path are respectively connected between the output end of the wilkinson power divider and the output microstrip line, and the input end of the wilkinson power divider is connected with the second port.
Preferably, the first transmission path includes a coupling transmission line having an electrical length of 180 °, and an open line having an electrical length of 45 ° and a ground short-circuit line having an electrical length of 45 ° are vertically loaded at both ends of the coupling transmission line; the second transmission path includes a meander transmission line having an electrical length of 180 ° and an impedance that is a port impedance of the wilkinson power divider.
The technical effects of the invention are at least reflected in that:
in some embodiments, the reconfigurable filter attenuator provided by the invention adopts a filter power divider with a novel structural design, and by adjusting the output phase and power distribution ratio of the filter power divider, the amplitude in a pass band can be continuously and flexibly adjusted while good band-pass filtering performance is formed, so that the system volume is effectively reduced, and the system cost is reduced.
In some embodiments, the reconstruction element is introduced into the filtering power divider to realize continuous adjustment of the working frequency, so that the device supports various working frequency requirements, and the flexibility of the system is effectively enhanced.
In other embodiments, the reconfigurable filter attenuator provided by the invention adopts a design structure in which a filter power divider and a broadband balun are cascaded, can better realize the filter attenuation function with continuously adjustable center frequency, and has various performance advantages of multifunctional integration, device miniaturization and the like compared with the existing filter attenuator.
Description of the drawings:
FIG. 1 is a schematic diagram of a reconfigurable filter attenuator according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a reconfigurable filter attenuator according to another embodiment of the present application;
FIG. 3 is a dimension parameter plot of a reconfigurable filter attenuator in an embodiment of the present application;
FIG. 4 is a pictorial diagram of a reconfigurable filter attenuator according to an embodiment of the present application;
FIG. 5 is a diagram showing the test result of the S parameter with the center frequency of 1.01GHz of the reconfigurable filter attenuator in the embodiment of the present application;
FIG. 6 is a diagram showing the test result of the S parameter with the center frequency of 1.09GHz of the reconfigurable filter attenuator in the embodiment of the present application;
fig. 7 is a diagram illustrating a test result of the S parameter with a center frequency of 1.19GHz of the reconfigurable filter attenuator according to the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides the following embodiments:
referring to fig. 1, the reconfigurable filter attenuator based on the continuously adjustable center frequency as an embodiment includes a substrate 1 and a filtering power dividing module constructed on the substrate 1;
the filtering power division module comprises three microstrip resonators (2, 3 and 4) which are distributed in parallel at intervals, one end of each microstrip resonator is connected with a resonance adjusting unit for adjusting the resonance frequency of the microstrip resonator, and a coupling adjusting unit for adjusting the coupling state between the two adjacent microstrip resonators is connected between the two microstrip resonators;
the microstrip resonator in the middle is connected with a first port (port I) through a port microstrip line 5, and the two microstrip resonators on the two sides are respectively connected with output microstrip lines (6 and 7).
It can be understood that, in the filtering power division module of this embodiment, the reconstruction element is introduced to achieve continuous adjustment of the operating frequency, so that the device supports various operating frequency requirements, and the flexibility of the system is effectively enhanced. Specifically, the continuous adjustment control of the working frequency can be realized through the resonance adjusting unit; in addition, the power distribution ratio from the microstrip resonator located in the middle to the microstrip resonators on both sides thereof can be realized by adjusting the coupling state between the resonators by the coupling adjustment unit. Furthermore, through the output phase and the power distribution ratio of the filtering power distribution module, the continuous and flexible adjustment of the amplitude in the pass band can be realized while good band-pass filtering performance is formed, the system size is effectively reduced, and the system cost is reduced.
As shown in fig. 1, as a preferred embodiment, each microstrip resonator includes a narrow microstrip line and a wide microstrip line, and the narrow microstrip line and the wide microstrip line are connected to form a step impedance resonator. Specifically, for convenience of description, the microstrip resonator located in the middle is referred to as a first resonator 2, the microstrip resonator located below is referred to as a second resonator 3, and the microstrip resonator located above is referred to as a third resonator 4; the first resonator 2 is formed by connecting a narrow microstrip line 201 and a wide microstrip line 202, the second resonator 3 is formed by connecting a narrow microstrip line 301 and a wide microstrip line 302, the third resonator 4 is formed by connecting a narrow microstrip line 401 and a wide microstrip line 402, and the microstrip lines of the three resonators are parallel to each other.
As a preferred embodiment, each resonance adjusting unit includes a first varactor diode and a first fixed capacitor, one end of the first fixed capacitor is connected to the end of the narrow microstrip line of the corresponding microstrip resonator, the other end of the first fixed capacitor is connected to the cathode of the first varactor diode, and the anode of the first varactor diode is grounded. Specifically, as shown in fig. 1, a first fixed capacitor C4 and a first varactor CV4 are sequentially connected to the end of the narrow microstrip line 201 of the first resonator 2, a first fixed capacitor C5 and a first varactor CV5 are sequentially connected to the end of the narrow microstrip line 301 of the second resonator 3, and a first fixed capacitor C6 and a first varactor CV6 are sequentially connected to the end of the narrow microstrip line 401 of the third resonator 4.
Further preferably, in each of the resonance adjusting units, a bias circuit is loaded between the first varactor diode and the first fixed capacitor. Specifically, a bias circuit is loaded between the first varactor CV4 and the first fixed capacitor C4, between the first varactor CV5 and the first fixed capacitor C5, and between the first varactor CV6 and the first fixed capacitor C6, respectively; the bias circuit is used for adjusting the capacitance values of the corresponding first variable capacitance diodes (CV4, CV5 and CV6), frequency control of the filtering power division module is achieved through adjusting the capacitance values, and continuous adjustment of the center frequency is achieved. Optionally, in the bias circuit, a bias voltage is connected to a resistor and then applied between the first varactor diode and the first fixed capacitor.
As a preferred embodiment, each of the coupling adjustment units includes two second varactors, and the two second varactors are connected in series between the wide microstrip lines of two adjacent microstrip resonators in a cathode-to-back connection manner. Specifically, as shown in fig. 1, the second varactor diodes CV7 and CV8 are connected in series between the wide microstrip line 202 of the first resonator 2 and the wide microstrip line 302 of the second resonator 3 in a cathode-to-back connection manner, and the second varactor diodes CV9 and CV10 are connected in series between the wide microstrip line 202 of the first resonator 2 and the wide microstrip line 402 of the third resonator 4 in a cathode-to-back connection manner.
Further preferably, in each coupling adjustment unit, a bias circuit is loaded between the two second varactors. Specifically, one bias circuit is loaded between the second varactors CV7 and CV8 and between the second varactors CV9 and CV10, respectively, and the bias circuits are used to adjust the capacitance values of the second varactors (CV7, CV8, CV9, and CV10), so as to adjust the coupling state between the first resonator 2 and the second resonator 3 and the coupling state between the first resonator 2 and the third resonator 4, respectively, and further adjust the power distribution ratio from the first resonator 2 to the second resonator 3 and the third resonator 4.
As a preferred embodiment, referring to fig. 1, an impedance matching unit is respectively connected between the narrow microstrip line 201 of the first resonator 2 and the port microstrip line 5, between the wide microstrip line 301 of the second resonator 3 and the first output microstrip line 6, and between the wide microstrip line 401 of the third resonator 4 and the second output microstrip line 7; each impedance matching unit comprises a third variable capacitance diode and a second fixed capacitor, the anode of the third variable capacitance diode is connected to the corresponding narrow microstrip line, and the cathode of the third variable capacitance diode is connected to the second fixed capacitor. Specifically, as shown in fig. 1, a third varactor CV1 and a second fixed capacitor C1 are sequentially connected to the narrow microstrip line 201 near the end thereof, an anode of the third varactor CV1 is connected to the narrow microstrip line 201, a cathode thereof is connected to the second fixed capacitor C1, and a second fixed capacitor C1 is connected to one end of the port microstrip line; a third varactor CV2 and a second fixed capacitor C2 are sequentially connected to the narrow microstrip line 301 near the end thereof, the anode of the third varactor CV2 is connected to the narrow microstrip line 301, the cathode thereof is connected to the second fixed capacitor C2, and the second fixed capacitor C2 is connected to one end of the first output microstrip line 6; a third varactor CV3 and a second fixed capacitor C3 are connected in sequence to the narrow microstrip line 401 near the end thereof, the anode of the third varactor CV3 is connected to the narrow microstrip line 401, the cathode thereof is connected to the second fixed capacitor C3, and the second fixed capacitor C3 is connected to one end of the second output microstrip line 7.
Further preferably, in each of the impedance matching units, a bias circuit is loaded between the third varactor diode and the second fixed capacitor. Specifically, a bias circuit is loaded between the third varactor CV1 and the second fixed capacitor C1, between the third varactor CV2 and the second fixed capacitor C2, and between the third varactor CV3 and the second fixed capacitor C3, respectively. It can be understood that, in the present embodiment, the capacitance values of the corresponding third varactors (CV1, CV2, CV3) can be adjusted by the loaded bias circuit, so as to adjust the external quality factor of the filtering power dividing module for external coupling matching, i.e. to control the impedance matching of the input/output ports of the filtering power dividing module; in addition, the second fixed capacitors (C1, C2, C3) are arranged to isolate the adverse effect of the DC bias voltage of the third varactor diode on the external devices.
As a preferred embodiment, referring to fig. 1, the narrow microstrip line 201 of the first resonator 2 and the narrow microstrip line 301 of the second resonator 3 are close to each other, so that in the power-on state, magnetic coupling can be formed between the first resonator 2 and the second resonator 3 to realize energy transfer between the first resonator 2 and the second resonator 3; the narrow microstrip line 201 of the first resonator 2 and the narrow microstrip line 401 of the third resonator 4 are away from each other, so that in the energized state, magnetic coupling cannot be formed between the first resonator 2 and the third resonator 4 to transfer energy. It should be noted that, in the present embodiment, since the high-impedance portions (i.e., the narrow microstrip lines) of the first resonator 2 and the second resonator 3 are relatively close to each other, it is easy to transfer energy from the first resonator 2 to the second resonator 3 through magnetic coupling, and the second varactor diodes CV7 and CV8 loaded between the first resonator 2 and the second resonator 3 can also transfer energy from the first resonator 2 to the second resonator 3 through electrical coupling, so that an electromagnetic hybrid coupling form can be generated between the first resonator 2 and the second resonator 3. Energy cannot be transferred between the first resonator 2 and the third resonator 4 through magnetic coupling, and therefore, the coupling type between the first resonator 2 and the third resonator 4 is pure electric coupling. In summary, in the scheme of the present embodiment, by adjusting the capacitance value of the second varactor, the power distribution ratio from the first resonator 2 to the second resonator 3 and the third resonator 4 can be respectively achieved; meanwhile, by switching the coupling type between the first resonator 2 and the second resonator 3, two output signals of the filtering power division module can be in an in-phase or anti-phase state, namely, a power division or balun mode.
In a preferred embodiment, a ground resistor is connected to the wide microstrip line of each microstrip resonator. Specifically, the wide microstrip line 202, the wide microstrip line 302, and the wide microstrip line 402 are respectively connected with a ground resistor, and the other end of the ground resistor is grounded, that is, each microstrip resonator is dc-grounded through the ground resistor, and preferably, the ground resistor is a 100K Ω patch resistor.
As a preferred implementation manner, the reconfigurable filter attenuator based on center frequency continuous adjustment of this embodiment further includes a broadband balun module, where the broadband balun module includes a cascaded broadband phase shift unit and a wilkinson power divider 12, the broadband phase shift unit has a first transmission path and a second transmission path, two ends of the first transmission path and the second transmission path are respectively connected between an output end of the wilkinson power divider and the output microstrip lines (6, 7), and an input end line 15 of the wilkinson power divider 12 is connected to a second port (port two).
As a further preferred embodiment, referring to fig. 2, the first transmission path includes a coupling transmission line 8 having an electrical length of 180 °, and an open line (901, 1001) having an electrical length of 45 ° and a ground short-circuit line (902, 1002) having an electrical length of 45 ° are vertically loaded at both ends of the coupling transmission line 8; the second transmission path includes a meandering transmission line 11 having an electrical length of 180 ° and an impedance equal to a port impedance of the wilkinson power divider. Specifically, in the first transmission path, a first loading line 9 formed by connecting a first open circuit line 901 and a first ground short-circuit line 902 is vertically loaded at one end of a coupling transmission line 8, a second loading line 10 formed by connecting a second open circuit line 1001 and a second ground short-circuit line 1002 is vertically loaded at the other end of the coupling transmission line 8, a first output microstrip line 6 is vertically connected to one side of the first loading line 9, and a first output microstrip line 13 of a wilkinson power divider 12 is vertically connected to one side of the second loading line 10; in the second transmission path, one end of the bent transmission line 11 is connected to the second output microstrip line 7, and the other end of the bent transmission line 11 is connected to the second output microstrip line 14 of the wilkinson power divider 12; an isolation resistor is connected between the first output end microstrip line 13 and the second output end microstrip line 14 of the wilkinson power divider 12 to realize better isolation.
It is worth to be noted that, in some embodiments provided above, the reconfigurable filter attenuator adopts a design structure in which a filtering power division module and a broadband balun module are cascaded, so that a filtering attenuation function with a continuously adjustable center frequency can be better realized, and compared with the existing filter attenuator, the reconfigurable filter attenuator has various performance advantages of multifunctional integration, device miniaturization and the like. Compared with the mode of adopting a delay line in the traditional phase shifter, the broadband phase shifting unit provided by the embodiment of the invention has the advantage of larger bandwidth.
In order to further explain the technical effects of the reconfigurable filter attenuator based on the continuously adjustable center frequency provided by the embodiment of the application, specific description is given below by combining test results.
Referring to fig. 4, which shows an actual diagram of the reconfigurable filter attenuator under test, the circuit structure of the actual diagram in fig. 4 is the same as that shown in fig. 2, and specific dimensional parameter labels are shown in fig. 3. Specifically, the substrate is Rogers 6010, the thickness of the substrate is 25mil, and the varactor diodes (CV1, CV2, CV3, CV4, CV5, CV6, CV7, CV8, CV9 and CV10) are MA46H202 type varactor diodes of MACOM corporation; the fixed capacitors (C1, C2, C3, C4, C5 and C6) are constant value patch capacitors with the packaging type of 0402; the resistor is a chip resistor with a packaging type 0402, and the resistance values of the resistors are all 100 kilohms except for 100 omega for the isolation resistor. The optimal circuit size parameters obtained after simulation optimization design are as follows: l is1＝18mm,L2＝6mm,L3＝6.14mm,L4＝13.73mm，L5＝27.6mm，W1＝1mm，W2＝4mm，W3＝0.57mm，W4＝0.32mm,W5＝0.16mm，S1＝1.2mm，S2＝2mm，d1＝1.38mm，d2＝0.68mm。
Fig. 5, fig. 6 and fig. 7 are diagrams of S parameter test results of the tested reconfigurable filter attenuator with center frequencies of 1.01GHz, 1.09GHz and 1.19GHz, respectively, where a Solid line (Solid) is a measured (Meas) curve, and a dashed line (dised) is a simulated (Sim) curve; from the test results, it can be seen that different pass band amplitude curves at different center frequencies and at the same center frequency can be obtained by adjusting the bias state of each varactor in the circuit, and further, it can be seen that the reconfigurable filter attenuator provided by the embodiment of the application realizes that the center frequency can be continuously adjusted within the range of 1.01GHz-1.19GHz, and realizes excellent reconfigurable pass band filtering performance, and meanwhile, the pass band insertion loss can be continuously adjusted within the range of 3.3dB-21.5 dB. Therefore, the results verify that the reconfigurable filter attenuator of the embodiment of the application can realize flexible adjustment of the amplitude of the pass band while forming good band-pass filtering performance, and meanwhile, the center frequency of the reconfigurable filter attenuator can also be continuously adjusted within a certain range.
In the description of the embodiments of the invention, the particular features, structures, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the embodiments of the present invention, it should be understood that "-" and "-" indicate the same range of two numerical values, and the range includes the endpoints. For example, "A-B" means a range greater than or equal to A and less than or equal to B. "A to B" means a range of not less than A and not more than B.
In the description of the embodiments of the present invention, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The reconfigurable filter attenuator is characterized by comprising a substrate and a filter power dividing module constructed on the substrate, wherein the center frequency of the reconfigurable filter attenuator is continuously adjustable;
the filtering power dividing module comprises three microstrip resonators distributed in parallel at intervals, one end of each microstrip resonator is connected with a resonance adjusting unit for adjusting the resonance frequency of the microstrip resonator, and a coupling adjusting unit for adjusting the coupling state between the two adjacent microstrip resonators is connected between the two microstrip resonators;
the microstrip resonator in the middle is connected with the first port through a port microstrip line, and the two microstrip resonators on two sides are respectively connected with an output microstrip line.
2. The reconfigurable filter attenuator of claim 1, wherein each microstrip resonator comprises a segment of a narrow microstrip line and a segment of a wide microstrip line, the narrow microstrip line and the wide microstrip line being connected to form a step impedance resonator.
3. The reconfigurable filter attenuator of claim 2, wherein each of the resonance adjusting units comprises a first varactor and a first fixed capacitor, one end of the first fixed capacitor is connected to the end of the narrow microstrip line of the corresponding microstrip resonator, the other end of the first fixed capacitor is connected to the cathode of the first varactor, and the anode of the first varactor is grounded.
4. The reconfigurable filter attenuator of claim 3, wherein each of the coupling adjustment units comprises two second varactors, and the two second varactors are connected in series between the wide microstrip lines of two adjacent microstrip resonators in a cathode-to-back connection.
5. The reconfigurable filter attenuator according to claim 4, wherein an impedance matching unit is connected between the narrow microstrip line of the microstrip resonator located in the middle and the port microstrip line, an impedance matching unit is connected between the wide microstrip line of the two microstrip resonators located on both sides and the output microstrip line, each impedance matching unit includes a third varactor and a second fixed capacitor, the anode of the third varactor is connected to the corresponding narrow microstrip line, and the cathode of the third varactor is connected to the second fixed capacitor.
6. The reconfigurable filter attenuator of claim 2, wherein the narrow microstrip line of the microstrip resonator in the middle is close to the narrow microstrip line of the microstrip resonator on one side, so that in the power-on state, magnetic coupling can be formed between the microstrip resonator in the middle and the microstrip resonator on the one side; the narrow microstrip line of the microstrip resonator in the middle is far away from the narrow microstrip line of the microstrip resonator on the other side, so that energy cannot be transferred between the microstrip resonator in the middle and the microstrip resonator on the other side through magnetic coupling in a power-on state.
7. The reconfigurable filter attenuator of claim 5, wherein in each of the resonant adjustment units, a bias circuit is loaded between the first varactor and the first fixed capacitor; in each coupling adjusting unit, a bias circuit is loaded between two second varactors; in each impedance matching unit, a bias circuit is loaded between the third varactor diode and the second fixed capacitor.
8. The reconfigurable filter attenuator of claim 1, wherein each microstrip resonator has a ground resistor connected to its wide microstrip line.
9. The reconfigurable filter attenuator of claim 1, further comprising a wideband balun module having a wideband phase shift unit and a Wilkinson power divider, wherein the wideband phase shift unit has a first transmission path and a second transmission path, two ends of the first transmission path and the second transmission path are respectively connected between the output end of the Wilkinson power divider and the output microstrip line, and the input end of the Wilkinson power divider is connected to the second port.
10. The reconfigurable filter attenuator of claim 9, wherein the first transmission path comprises a coupled transmission line having an electrical length of 180 °, and wherein an open line having an electrical length of 45 ° and a ground short-circuit line having an electrical length of 45 ° are vertically loaded at both ends of the coupled transmission line; the second transmission path comprises a meander transmission line having an electrical length of 180 ° and an impedance equal to a port impedance of the wilkinson power divider.
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