CN112216938A - Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division - Google Patents

Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division Download PDF

Info

Publication number
CN112216938A
CN112216938A CN202010950928.1A CN202010950928A CN112216938A CN 112216938 A CN112216938 A CN 112216938A CN 202010950928 A CN202010950928 A CN 202010950928A CN 112216938 A CN112216938 A CN 112216938A
Authority
CN
China
Prior art keywords
resonator
port
variable capacitance
dielectric substrate
varactor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010950928.1A
Other languages
Chinese (zh)
Inventor
杨涛
赖俊辰
徐锐敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Electronic Science and Technology of China
Original Assignee
University of Electronic Science and Technology of China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Electronic Science and Technology of China filed Critical University of Electronic Science and Technology of China
Priority to CN202010950928.1A priority Critical patent/CN112216938A/en
Publication of CN112216938A publication Critical patent/CN112216938A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2088—Integrated in a substrate

Abstract

The invention discloses a reconfigurable filter and a method for realizing 0dB cross-coupling filtering and filtering power division.A dielectric substrate is provided with four resonators, namely a first resonator, a second resonator, a third resonator and a fourth resonator, each resonator is provided with two branches, the resonators are arranged in a central symmetry mode by taking a central point of the upper end face of the dielectric substrate as an origin, single branches between adjacent resonators are connected through a varactor diode, and a port is respectively arranged between each of the four resonators and four sides of a square dielectric substrate and is respectively a first port, a second port, a third port and a fourth port. The reconfigurable filter is used for realizing two different functions of the cross coupler and the power divider so as to reduce the size and the cost of the device, and simultaneously, the multifunctional application of the filter is realized, and the central frequency is controllable.

Description

Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division
Technical Field
The invention belongs to the technical field of filter devices, relates to a cross-coupling filtering technology and a power division filtering technology, and particularly relates to a reconfigurable filter and a method for realizing 0dB cross-coupling filtering and filtering power division.
Background
In recent years, with the commercialization of 5G, the traffic of mobile wireless communication has increased significantly, 5G is an extension and development of 4G, and it merges networks such as 4G, WiFi, and is a complete wireless communication with almost no restriction; the 5G system has very high requirements on data capacity and speed, so the implementation of 5G communication does not leave the support of some key technologies, such as large-scale antenna arrays, ultra-dense networking, novel multiple access, novel network architecture, and the like. The large-scale antenna array receives high attention and extensive research, the 0dB cross coupler and the power divider are important components in the large-scale antenna array, however, the cross coupler, the power divider and the filter in the prior art are independent and single in function, the central frequency of the filter is also uncontrollable, and each device is independent, so that the occupied volume is overlarge.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a reconfigurable filter and a method for realizing 0dB cross-coupled filtering and filtering power division.
The invention is realized by the following technical scheme:
a reconfigurable filter comprises a square dielectric substrate, wherein four resonators are arranged on the upper end face of the dielectric substrate and are respectively a first resonator, a second resonator, a third resonator and a fourth resonator, each resonator is provided with two branches, the resonators are arranged in a central symmetry mode by taking the central point of the upper end face of the dielectric substrate as an origin, single branches between adjacent resonators are connected through a variable capacitance diode, a port is respectively arranged between each of the four resonators and the four sides of the square dielectric substrate and is respectively a first port, a second port, a third port and a fourth port, and signals can be input from any port.
Preferably, each branch of the resonator is provided with a through hole, the lower end surface of the dielectric substrate is provided with a varactor diode corresponding to each branch of the resonator, and the varactor diodes are connected with the branches of the resonator through the through holes.
Preferably, the first resonator is connected with the fourth resonator through a varactor C1 and a varactor C2, and the varactors C1 and C2 are connected in series back to back; the fourth resonator and the third resonator are connected through a variable capacitance diode C3 and a variable capacitance diode C4, and the variable capacitance diodes C3 and C4 are connected in series back to back; the third resonator and the second resonator are connected through a variable capacitance diode C5 and a variable capacitance diode C6, and the variable capacitance diodes C5 and C6 are connected in series back to back; the second resonator and the first resonator are connected through a variable capacitance diode C7 and a variable capacitance diode C8, and the variable capacitance diodes C7 and C8 are connected in series back to back.
Preferably, the cathodes of the varactors C1 and C2, the cathodes of the varactors C3 and C4, the cathodes of the varactors C5 and C6, and the cathodes of the varactors C7 and C8 are all loaded with a reverse bias voltage source, and a 100k Ω patch resistor is connected between the reverse bias voltage source and each varactor cathode.
Preferably, the first port, the second port, the third port and the fourth port are respectively connected with a 50 Ω characteristic impedance coplanar waveguide, one side of the 50 Ω characteristic impedance coplanar waveguide is connected with two back-to-back series-connected varactor diodes, cathodes of the two varactor diodes are loaded with a dc bias voltage source, and a 100k Ω patch resistor is connected between the dc bias voltage source and the cathode of the varactor diode.
Preferably, a layer of copper foil is covered on the upper end face of the dielectric substrate, four piezoelectric actuators, namely a first piezoelectric actuator, a second piezoelectric actuator, a third piezoelectric actuator and a fourth piezoelectric actuator, are respectively arranged above the copper foil and at positions corresponding to the four resonators of the dielectric substrate, and a bias voltage is applied to each piezoelectric actuator to realize the up-and-down braking control of the piezoelectric actuator.
The invention also discloses a method for realizing the 0dB cross coupling function of the controllable filtering of the independent channel, which can be implemented based on the reconfigurable filter and comprises the following implementation steps: zero coupling is generated between the first resonator and the second resonator, between the second resonator and the third resonator, between the third resonator and the fourth resonator, and between the fourth resonator and the first resonator by adjusting the voltage value, so that a signal input through the first port is coupled to the third resonator through the first resonator and output through the third port in one path, and is coupled to the fourth resonator through the second resonator and output through the fourth port in the other path, the two paths of signals output the band-pass filtering performance, the working frequency of a passband is independently adjustable, and the adjacent ports are in an isolated state, thereby realizing the 0dB cross coupling function of controllable filtering of the independent channel.
The invention also discloses a method for realizing the filtering power division network function, which can be implemented based on the reconfigurable filter and comprises the following implementation steps: zero coupling is generated between the second resonator and the third resonator, between the third resonator and the fourth resonator, and between the first resonator and the fourth resonator by adjusting the voltage value; and the resonance frequency of the fourth resonator is far away from that of the second resonator, so that the fourth resonator is in a detuned state, namely the coupling coefficient K between the fourth resonator and the second resonator is obtained240; in addition, the coupling coefficient K between the first resonator and the second resonator is made12Coupling coefficient K with the first resonator and the third resonator13And the two paths of signals output equal-amplitude in-phase band-pass filtering performance, so that the filtering power division network function is realized.
The invention has the beneficial effects that:
through ingenious structural design, the disclosed reconfigurable filter effectively integrates the functions of a 0dB cross coupler, a power divider and the filter into one device, greatly reduces the size of the device, and reduces the cost and the mismatch between the devices. By selecting a proper voltage value, the function of the independent channel controllable filtering 0dB cross coupler and the function of the filtering power division network can be respectively realized.
Drawings
FIG. 1 is a three-dimensional perspective block diagram of a reconfigurable filter according to an embodiment of the invention;
fig. 2 is a bottom circuit structure diagram of the reconfigurable filter of the embodiment of the invention in a top perspective view;
FIG. 3 is a schematic view of a piezoelectric actuator arrangement according to an embodiment of the present invention;
FIG. 4 is a diagram of the coupling topology of a reconfigurable filter according to one embodiment of the invention;
FIG. 5 is a test chart of the synchronous tuning S parameter of the reconfigurable filter according to the embodiment of the present invention;
FIG. 6 is a test chart of the asynchronous tuning independent channel control S parameter of the reconfigurable filter according to the embodiment of the present invention;
fig. 7 is a test diagram of S parameter of the power division filter network of the reconfigurable filter according to the embodiment of the present invention.
The reference numbers in the drawings are as follows:
1. a first resonator; 2. a second resonator; 3. a third resonator; 4. a fourth resonator; 5. a first port; 6. a second port; 7. a third port; 8. a fourth port; 9. a first piezoelectric actuator; 10. a second piezoelectric actuator; 11. a third piezoelectric actuator; 12. a fourth piezoelectric actuator; 13. the vias are metallized.
Detailed Description
The invention is further described below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Referring to fig. 1 to 3, a reconfigurable filter according to an embodiment of the present invention:
a reconfigurable filter comprises a square dielectric substrate, wherein four resonators, namely a first resonator 1, a second resonator 2, a third resonator 3 and a fourth resonator 4 are arranged on the upper end face of the dielectric substrate, each resonator is provided with two branches, the resonators are arranged in a central symmetry mode by taking the central point of the upper end face of the dielectric substrate as an origin, single branches between adjacent resonators are connected through a variable capacitance diode, a port is arranged between each of the four resonators and the four sides of the square dielectric substrate and respectively comprises a first port 5, a second port 6, a third port 7 and a fourth port 8, and signals can be input from any port; furthermore, a through hole is formed in each branch of the resonator, a variable capacitance diode is arranged at the lower end face of the dielectric substrate corresponding to each branch of the resonator, and the variable capacitance diodes are connected with the branches of the resonator through the through holes.
Referring to fig. 1 and 2, as an alternative embodiment, the first resonator 1 and the fourth resonator 4 are connected to a bottom-loading varactor through a branch added to a capacitive load and a metalized via 13 at the other end of the branch (note: the metalized via 13 in fig. 1 is not shown in fig. 2), specifically, the first resonator 1 and the fourth resonator 4 are connected through a varactor C1 and a varactor C2, and the varactors C1 and C2 are connected in series back to back. Further preferably, the cathodes of the varactor C1 and the varactor C2 are loaded with a reverse bias voltage source, and the voltage source is connected with the varactor C1 and the varactor C2 through a 100k Ω chip resistor R1; the reverse bias voltage source is used for changing the voltage value to achieve the effect of adjusting the coupling between the first resonator and the fourth resonator of the filter network;
further, the third resonator 3 and the fourth resonator 4 are connected to the bottom loading varactor through adding a branch at the capacitive load and a metalized via at the other end of the branch, specifically, the fourth resonator 4 and the third resonator 3 are connected through a varactor C3 and a varactor C4, and the varactors C3 and C4 are connected in series back to back. Further preferably, the cathodes of the varactor C3 and the varactor C4 are loaded with a reverse bias voltage source, and the voltage source is connected with the varactor C3 and the varactor C4 through a 100k Ω chip resistor R2; the reverse bias voltage source is used for changing the voltage value to achieve the effect of adjusting the coupling between the third resonator and the fourth resonator of the filter network;
furthermore, the second resonator 2 and the third resonator 3 are connected to the bottom surface loading variable capacitance diode through a metallized through hole at the other end of the branch by adding the branch at the capacitive load; specifically, the third resonator 3 and the second resonator 2 are connected through a varactor C5 and a varactor C6, and the varactors C5 and C6 are connected in series back to back. Further preferably, the cathodes of the varactor C5 and the varactor C6 are loaded with a reverse bias voltage source, and the voltage source is connected with the varactor C5 and the varactor C6 through a 100k Ω chip resistor R3; the voltage value is changed through a reverse bias voltage source, and the effect of adjusting the coupling between the second resonator and the third resonator of the filter network is achieved.
Furthermore, the first resonator 1 and the second resonator 2 are connected to the bottom surface loading variable capacitance diode through a metallized through hole at the other end of the branch by adding the branch to the capacitive load; specifically, the first resonator 1 and the second resonator 2 are connected through a varactor diode C7 and a varactor diode C8, and the varactor diodes C7 and C8 are connected in series back to back. Further preferably, the cathodes of the varactor C7 and the varactor C8 are loaded with a reverse bias voltage source, and the voltage source is connected with the varactor C7 and the varactor C8 through a 100k Ω chip resistor R4; the voltage value is changed through a reverse bias voltage source, and the effect of adjusting the coupling between the first resonator and the second resonator of the filter network is achieved.
It can be understood that in this embodiment, a groove is formed in the dielectric substrate, copper plating is performed to implement a capacitive load, a branch is added to the capacitive load, a through hole is opened at the other end of the branch to connect to the back-loading varactor, so that inter-stage electric coupling and magnetic coupling cancellation are implemented, and a zero coupling and cut-off state are implemented.
As one of alternative embodiments, for convenience of description, taking a first port 5 and a second port 6 as input ports, and taking a third port 7 and a fourth port 8 as output ports as examples, the first port 5 is connected to a 50 Ω coplanar waveguide, one side of the 50 Ω coplanar waveguide is connected by a varactor C9 and a varactor C10, the varactors C9 and C10 are connected in series back to back, cathodes of the varactors C9 and C10 are loaded with a dc bias voltage source, the dc bias voltage source is connected with cathodes of the varactors C9 and C10 by a 100k Ω patch resistor R5, and the voltage value can be changed by the dc bias voltage source, so as to achieve the effect of adjusting the external coupling of the input end of the filter network;
the second port 6 is connected with a coplanar waveguide with characteristic impedance of 50 omega, one side of the coplanar waveguide with 50 omega is connected with a variable capacitance diode C11 and a variable capacitance diode C12, the variable capacitance diodes C11 and C12 are connected in series back to back, the cathodes of the variable capacitance diodes C11 and C12 are loaded with a direct current bias voltage source, the direct current bias voltage source is connected with the cathodes of the variable capacitance diodes C11 and C12 by a 100k omega patch resistor R6, the voltage value is changed by the direct current bias voltage source, and the external coupling effect of the input end of the filter network is adjusted;
the third port 7 is connected with a coplanar waveguide with characteristic impedance of 50 omega, one side of the coplanar waveguide with 50 omega is connected with a variable capacitance diode C13 and a variable capacitance diode C14, the variable capacitance diodes C13 and C14 are connected in series back to back, the cathode of the diode is loaded with direct current bias voltage, a voltage source is connected with the cathode of the variable capacitance diode through a 100k omega patch resistor R7, and the external coupling effect of the output end of the filter network is adjusted by changing the voltage value;
the fourth port 8 is connected with a coplanar waveguide with characteristic impedance of 50 omega, one side of the coplanar waveguide with 50 omega is connected with a variable capacitance diode C15 and a variable capacitance diode C16, the variable capacitance diodes C15 and C16 are connected in series back to back, the cathode of the diode loads direct current bias voltage, a voltage source is connected with the cathode of the variable capacitance diode through a 100k omega patch resistor R8, and the effect of adjusting the external coupling of the input end of the filter network is achieved by changing the voltage value.
As an alternative embodiment, a layer of copper foil is coated on the upper end face of the dielectric substrate, and four piezoelectric actuators, namely a first piezoelectric actuator 9, a second piezoelectric actuator 10, a third piezoelectric actuator 11 and a fourth piezoelectric actuator 12, are respectively arranged on the copper foil at positions corresponding to the four resonators of the dielectric substrate.
As one of the alternative embodiments, a layer of copper foil is coated on a dielectric substrate, a conductive silver paste is used for bonding a first piezoelectric actuator 9 at a position corresponding to a first resonator 1 on the copper foil, and a bias voltage is applied to the upper part of the first piezoelectric actuator 9 to drive the piezoelectric actuator up and down, so that the purpose of adjusting the resonant frequency of the first resonator 1 is achieved; bonding a second piezoelectric actuator 10 at a position, corresponding to the second resonator 2, on the copper foil by using conductive silver paste, and applying bias voltage to the upper part of the second piezoelectric actuator 10 to enable the piezoelectric actuator to actuate up and down so as to achieve the aim of adjusting the resonant frequency of the second resonator 2; bonding a third piezoelectric actuator 11 at a position, corresponding to the third resonator 3, on the copper foil by using conductive silver paste, and applying bias voltage to the upper part of the third piezoelectric actuator 11 to enable the piezoelectric actuator to actuate up and down so as to achieve the aim of adjusting the resonant frequency of the third resonator 3; and a fourth piezoelectric actuator 12 is bonded at a position, corresponding to the fourth resonator 4, on the copper foil by using conductive silver paste, and a bias voltage is applied to the upper part of the fourth piezoelectric actuator 12 to drive the piezoelectric actuator to actuate up and down, so that the aim of adjusting the resonant frequency of the fourth resonator 4 is fulfilled.
The embodiment of the invention also provides a method for realizing the 0dB cross coupling function of the controllable filtering of the independent channel, which can be implemented based on the reconfigurable filter, and enables zero coupling to be generated between the first resonator 1 and the second resonator 2, between the second resonator 2 and the third resonator 3, between the third resonator 3 and the fourth resonator 4, and between the fourth resonator 4 and the first resonator 1 by selecting proper voltage values, namely the coupling coefficient relation is K12＝K23＝K34＝K 140; therefore, one path of signals input through the first port 5 passes through the coupling of the first resonator 1 to the third resonator 3 and is output through the third port 7, the other path of signals passes through the coupling of the second resonator 2 to the fourth resonator 4 and is output through the fourth port 8, the two paths of signals output the band-pass filtering performance, the working frequency of a passband is independently adjustable, adjacent ports are in an isolation state, and the function of controllable filtering 0dB cross coupling of independent channels is achieved. Further, in this mode, the independent frequency-tunable functions of the first port 5 to the third port 7 and the second port 6 to the fourth port 8 can be realized by simultaneously adjusting the bias voltages of the first piezoelectric actuator 9 and the third piezoelectric actuator 11 or the bias voltages of the second piezoelectric actuator 10 and the fourth piezoelectric actuator 12.
The embodiment of the invention also discloses a method for realizing the function of the filtering power division network, which can be implemented based on the reconfigurable filter and comprises the following implementation steps: the implementation steps comprise: by selecting proper voltage values, zero coupling, namely K, is generated between the second resonator 2 and the third resonator 3, between the third resonator 3 and the fourth resonator 4, and between the first resonator 1 and the fourth resonator 414＝K23＝K 340; and the resonance frequency of the fourth resonator 4 is far from that of the second resonator 2, so that the fourth resonator is in a detuned state, namely K 240. In addition K12＝K13The second order filter state is satisfied such that the signal input through the first port 29 is output from the second port 6 through the coupling of the first resonator 1 to the second resonator 2 on one path, and is output from the third port 7 through the coupling of the first resonator 1 to the third resonator 3 on the other path in turn. Two routesThe signal output has equal amplitude and same phase band-pass filtering performance, and the filtering power division network function is realized. Further, in this mode, the frequency tunable function can be realized by adjusting the bias voltages of the first piezoelectric actuator 9, the second piezoelectric actuator 10, and the third piezoelectric actuator 11. As shown in fig. 4, which is a coupling topological diagram of the reconfigurable filter according to the embodiment of the present invention, it can be understood that P1, P2, P3, and P4 respectively represent ports corresponding to the first resonator, the second resonator, the third resonator, and the fourth resonator, K represents a resonator coupling coefficient, and Q represents a quality factor.
It can be understood that in the mode that the independent channel controllable filtering 0dB cross coupler and the filtering power dividing network function differently, the external coupling capacitors C9-C16 of each port can be adjusted by adjusting the bias voltage, so that the input/output ports of each mode can be optimally matched.
The following is an example of practical testing of the reconfigurable filter according to the embodiment of the present invention, in which the dielectric substrate employs Rogers4350B, and the thickness of the substrate is 60 mil. The input port and the output port are respectively welded with SMA joints; the varactors are Macom model MA46H201 varactors, the chip resistors are 0402 packaged chip resistors, and the piezoelectric actuators are Piezo model T216-A4N 0-05.
Fig. 5 shows a synchronous tuning S-parameter test chart of the reconfigurable filter in the independent channel controllable filtering 0dB cross coupler mode according to the embodiment of the present invention, and fig. 6 shows an asynchronous tuning independent channel control S-parameter test chart of the reconfigurable filter in the independent channel controllable filtering 0dB cross coupler mode according to the embodiment of the present invention; fig. 7 is a test diagram of S parameter of the power division filter network of the reconfigurable filter according to the embodiment of the present invention. Wherein, the abscissa is frequency, the ordinate is amplitude, and S is the measured value of the S parameter. Taking the example in fig. 5, when the center frequency is 1.88GHz, the voltage value correspondingly loaded by the varactor diodes C1-C8 is 2V, the voltage value correspondingly loaded by the varactor diodes C9-C16 is 3V, when the center frequency is 2.08GHz, the voltage value correspondingly loaded by the varactor diodes C1-C8 is 3.5V, the voltage value correspondingly loaded by the varactor diodes C9-C16 is 5.3V, when the center frequency is 2.48GHz, the voltage value correspondingly loaded by the varactor diodes C1-C8 is 4.7V, and the voltage value correspondingly loaded by the varactor diodes C9-C16 is 9.8V; when the center frequency is 2.81GHz, the voltage value loaded by the variable capacitance diodes C1-C8 is 12V, and the voltage value loaded by the variable capacitance diodes C9-C16 is 24.5V. S parameter test results of figures 5-7 show that the reconfigurable filter provided by the invention has a correct and feasible design concept, can effectively realize the independent channel controllable filtering 0dB cross coupler function and the filtering power division network, can conveniently realize independent and flexible switching of center frequencies of two filtering channels, and can realize the filtering power division function passband frequency reconfiguration. The problem of among the prior art filter function singleness, center frequency uncontrollable is solved.
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "inner", "outer", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Where "inside" refers to an interior or enclosed area or space. "periphery" refers to an area around a particular component or a particular area.
In the description of the embodiments of the present invention, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the embodiments of the invention, the particular features, structures, materials, 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 kinds of 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 (8)

1. A reconfigurable filter comprises a square dielectric substrate and is characterized in that four resonators, namely a first resonator, a second resonator, a third resonator and a fourth resonator, are arranged on the upper end face of the dielectric substrate, each resonator is provided with two branches, the resonators are arranged in a central symmetry mode by taking the central point of the upper end face of the dielectric substrate as an origin, single branches between adjacent resonators are connected through a variable capacitance diode, a port is arranged between each of the four resonators and the four sides of the square dielectric substrate and respectively serves as a first port, a second port, a third port and a fourth port, and signals can be input from any port.
2. The reconfigurable filter according to claim 1, wherein a through hole is provided at each of the branches of the resonator, and a varactor diode is provided at a lower end of the dielectric substrate corresponding to each of the branches of the resonator, and the varactor diode is connected to the branches of the resonator through the through hole.
3. The reconfigurable filter of claim 2, wherein the first resonator is connected to a fourth resonator through a varactor C1 and a varactor C2, the varactors C1 and C2 being connected in series back-to-back; the fourth resonator and the third resonator are connected through a variable capacitance diode C3 and a variable capacitance diode C4, and the variable capacitance diodes C3 and C4 are connected in series back to back; the third resonator and the second resonator are connected through a variable capacitance diode C5 and a variable capacitance diode C6, and the variable capacitance diodes C5 and C6 are connected in series back to back; the second resonator and the first resonator are connected through a variable capacitance diode C7 and a variable capacitance diode C8, and the variable capacitance diodes C7 and C8 are connected in series back to back.
4. The reconfigurable filter of claim 3, wherein the cathodes of the varactors C1 and C2, the cathodes of C3 and C4, the cathodes of C5 and C6, and the cathodes of C7 and C8 are all loaded with a reverse bias voltage source, and a 100k Ω patch resistor is connected between the reverse bias voltage source and each varactor cathode.
5. The reconfigurable filter according to claim 1, wherein the first port, the second port, the third port and the fourth port are respectively connected with a 50 Ω characteristic impedance coplanar waveguide, one side of the 50 Ω characteristic impedance coplanar waveguide is connected with two varactors connected in series back to back, cathodes of the two varactors are loaded with a dc bias voltage source, and a 100k Ω patch resistor is connected between the dc bias voltage source and the cathode of the varactors.
6. The reconfigurable filter of claim 1, wherein a layer of copper foil is coated on the upper end face of the dielectric substrate, four piezoelectric actuators, namely a first piezoelectric actuator, a second piezoelectric actuator, a third piezoelectric actuator and a fourth piezoelectric actuator, are respectively arranged above the copper foil at positions corresponding to the four resonators of the dielectric substrate, and a bias voltage is applied to each piezoelectric actuator to control the piezoelectric actuators to brake up and down.
7. A method for implementing independent channel controllable filtering 0dB cross-coupling function, based on the reconfigurable filter implementation of any one of claims 1-6, the implementation steps comprising: zero coupling is generated between the first resonator and the second resonator, between the second resonator and the third resonator, between the third resonator and the fourth resonator, and between the fourth resonator and the first resonator by adjusting the voltage value, so that a signal input through the first port is coupled to the third resonator through the first resonator and output through the third port in one path, and is coupled to the fourth resonator through the second resonator and output through the fourth port in the other path, the two paths of signals output the band-pass filtering performance, the working frequency of a passband is independently adjustable, and the adjacent ports are in an isolated state, thereby realizing the 0dB cross coupling function of controllable filtering of the independent channel.
8. A method for implementing a filtering power division network function, based on the reconfigurable filter implementation of any one of claims 1 to 6, the implementation steps comprising: zero coupling is generated between the second resonator and the third resonator, between the third resonator and the fourth resonator, and between the first resonator and the fourth resonator by adjusting the voltage value; and the resonance frequency of the fourth resonator is far away from that of the second resonator, so that the fourth resonator is in a detuned state, namely the coupling coefficient K between the fourth resonator and the second resonator is obtained240; in addition, the coupling coefficient K between the first resonator and the second resonator is made12With the first and third resonatorsCoefficient of coupling between K13And the two paths of signals output equal-amplitude in-phase band-pass filtering performance, so that the filtering power division network function is realized.
CN202010950928.1A 2020-09-11 2020-09-11 Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division Pending CN112216938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010950928.1A CN112216938A (en) 2020-09-11 2020-09-11 Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010950928.1A CN112216938A (en) 2020-09-11 2020-09-11 Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division

Publications (1)

Publication Number Publication Date
CN112216938A true CN112216938A (en) 2021-01-12

Family

ID=74049243

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010950928.1A Pending CN112216938A (en) 2020-09-11 2020-09-11 Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division

Country Status (1)

Country Link
CN (1) CN112216938A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100012101A1 (en) * 2021-05-11 2022-11-11 Commscope Italy Srl FILTERS INCLUDING DOUBLE CROSS COUPLINGS AND RELATED COMBINATORS
WO2023160333A1 (en) * 2022-02-28 2023-08-31 华为技术有限公司 Communication apparatus
CN117691965A (en) * 2024-02-04 2024-03-12 无锡频岢微电子有限公司 Filter containing half-mode substrate coaxial resonator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107123844A (en) * 2017-04-06 2017-09-01 江南大学 A kind of electric tunable electro-magnetic bandgap wave filter of miniature restructural
CN111146548A (en) * 2019-12-30 2020-05-12 电子科技大学 Reconfigurable gap bridge filter network based on SIW evanescent mode resonator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107123844A (en) * 2017-04-06 2017-09-01 江南大学 A kind of electric tunable electro-magnetic bandgap wave filter of miniature restructural
CN111146548A (en) * 2019-12-30 2020-05-12 电子科技大学 Reconfigurable gap bridge filter network based on SIW evanescent mode resonator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JUNCHEN LAI.ET.AL: "Novel Evanescent-Mode Cavity Filter With Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions", 《IEEE ACCESS》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100012101A1 (en) * 2021-05-11 2022-11-11 Commscope Italy Srl FILTERS INCLUDING DOUBLE CROSS COUPLINGS AND RELATED COMBINATORS
WO2022238396A1 (en) * 2021-05-11 2022-11-17 Commscope Italy S.R.L. Filters including dual cross-couplings and related combiners
WO2023160333A1 (en) * 2022-02-28 2023-08-31 华为技术有限公司 Communication apparatus
CN117691965A (en) * 2024-02-04 2024-03-12 无锡频岢微电子有限公司 Filter containing half-mode substrate coaxial resonator

Similar Documents

Publication Publication Date Title
CN112216938A (en) Reconfigurable filter and method for realizing 0dB cross-coupling filtering and filtering power division
WO2013005264A1 (en) Variable filter device and communication device
US5097236A (en) Parallel connection multi-stage band-pass filter
CN102832433B (en) Non-uniform power divider with integrated band-pass filtering function
EP1962367B1 (en) Variable resonator, tunable filter, and electric circuit device
JP3570375B2 (en) Frequency variable filter, antenna duplexer and communication device
CN111146548A (en) Reconfigurable gap bridge filter network based on SIW evanescent mode resonator
JPH09504157A (en) Filter with adjustable shunt zero
CN102403563A (en) Powder divider integrating single-frequency bandpass filter
US5184096A (en) Parallel connection multi-stage band-pass filter comprising resonators with impedance matching means capacitively coupled to input and output terminals
CN102403562A (en) Powder divider integrating a dual-frequency bandpass filter
CN114050385A (en) Continuous electrically tunable band-pass filter
CN107946706B (en) Double frequency band-pass filter and its design method based on micro-strip and substrate integration wave-guide
JP2002118486A (en) High-frequency composite switch module
CN202308258U (en) Power divider integrated with single-frequency band-pass filters
CN104377411B (en) Varactor loaded reconfigurable band rejection filter
CN212303859U (en) High-performance multimode double-broadband filter
CN112216939A (en) Filter device and method for realizing filtering power division and duplexer functions
EP1895616B1 (en) Irreversible circuit element
CN100508379C (en) Variable delay line
CN202308257U (en) Power divider integrated with double-frequency band-pass filter
JPWO2013005264A1 (en) Variable filter device and communication device
CN110336107B (en) Band-pass or band-stop reconfigurable HMSIW filter
CN204189935U (en) The restructural band stop filter that a kind of varactor loads
JP2003158467A (en) Rf device and communication apparatus using the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210112