CN110474138B - Reconfigurable power division filter - Google Patents
Reconfigurable power division filter Download PDFInfo
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- CN110474138B CN110474138B CN201910807716.5A CN201910807716A CN110474138B CN 110474138 B CN110474138 B CN 110474138B CN 201910807716 A CN201910807716 A CN 201910807716A CN 110474138 B CN110474138 B CN 110474138B
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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
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Abstract
The invention discloses a reconfigurable power division filter, which comprises a dielectric substrate, wherein a metal grounding plate is arranged on the bottom surface of the dielectric substrate, an input port feeder line, a first output port feeder line and a second output port feeder line are respectively arranged on the dielectric substrate, a multi-mode resonator is arranged between the input port feeder line and the first output port feeder line as well as between the input port feeder line and the second output port feeder line, and an isolation resistor is arranged between the first output port feeder line and the second output port feeder line. The input port feeder comprises a 50 ohm microstrip line conduction band, an impedance matching line and a wavelength main transmission line, one end of the 50 ohm microstrip line conduction band extends to the side edge of the dielectric substrate, the other end of the 50 ohm microstrip line conduction band is connected with the impedance matching line, and the other end of the impedance matching line is connected with the wavelength main transmission line.
Description
Technical Field
The invention relates to the technical field of microwave passive devices, in particular to a reconfigurable power division filter.
Background
Power dividers and filters are two indispensable passive devices in modern wireless communication systems. In a system, they are usually cascaded together, which often results in large circuit size and high insertion loss. To solve this problem, the Power divider and the band pass filter are integrated into one component, i.e., a Power divider Filter (FPD), while implementing the functions of designated Power division/combination and frequency selectivity. In addition, with the development of modern wireless communication systems, the demand for reconfigurable microwave devices with multiple functions is increasing. However, research on reconfigurable power division filters is rare.
The reconfigurability of document 1[ H.Zhu, A.M.Abbosh, and L.Guo, "Planar In-Phase Filtering Power Divider With Tunable Power Division and control Band for Wireless Communication Systems," IEEE Transactionson Components, packaging and Manufacturing Technology, vol.8, No.8, pp.1458-1468, Aug.2018] FPD is achieved by loading the branches and varactors on the lambda/4 impedance transformer of the Wilkinson Power Divider. However, the lack of center frequency tunability limits its applications.
Document 2[ c.f.chen, c. -y.lin, b. -h.tseng, and s. -f.chang, "Compact micro strip electronic Tunable Power Divider With Chebyshevbandpass response," IEEE Microwave Conference, vol.pp.1291-1293, nov.2014] and document 3[ l.gao, x.y.zhang, and q.xue, "Compact Tunable Power Divider With stable impedance band width," IEEE Transactions on wave Theory and technologies, vol.63, No.10, pp.3505-3513, oct.2015] utilize a pair of varactor-loaded resonant Tunable structures instead of the design of the λ/4 impedance Divider to achieve Tunable filter designs that, although these filter designs may not achieve high Bandwidth variations, these filter designs may not be Compact or may not be designed With a high Bandwidth.
Document 4[ p.l.chi and t.yang, "a 1.3-2.08 GHz Filtering Power Divider With Band Control and High In-Band Isolation," IEEE Microwave & Wireless Components Letters, vol.26, No.6, pp.407-409, may.2016] combines a three-port input tuning network With two second-order filters, and proposes a varactor-based High Isolation FPD. However, the involvement of too many varactors (12) makes the design very complex.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a reconfigurable power division filter aiming at the defects of the prior art.
In order to solve the technical problem, the invention discloses a reconfigurable power division filter which comprises a dielectric substrate, wherein a metal grounding plate is arranged on the bottom surface of the dielectric substrate, an input port feeder line, a first output port feeder line and a second output port feeder line are respectively arranged on the dielectric substrate, a multimode resonator is arranged between the input port feeder line and the first output port feeder line, and between the input port feeder line and the second output port feeder line, an isolation resistor is arranged between the first output port feeder line and the second output port feeder line.
In the invention, the input port feeder comprises a 50 ohm microstrip line conduction band, an impedance matching line and a wavelength main transmission line, one end of the 50 ohm microstrip line conduction band extends to the side edge of the dielectric substrate, the other end of the 50 ohm microstrip line conduction band is connected with the impedance matching line, and the other end of the impedance matching line is connected with the wavelength main transmission line.
In the invention, the first output port feeder line comprises a first 50 ohm microstrip line conduction band, a first impedance matching line and a first coupling output line which are connected in sequence, the first 50 ohm microstrip line conduction band is parallel to the first coupling output line, and the first impedance matching line is of an L-shaped structure.
In the invention, the second output port feeder line comprises a second 50 ohm microstrip line conduction band, a second impedance matching line and a second coupling output line which are connected in sequence, the second 50 ohm microstrip line conduction band is parallel to the second coupling output line, and the second impedance matching line is of an L-shaped structure.
In the invention, the multimode resonator comprises a first quarter-wave resonator, a second quarter-wave resonator, a third quarter-wave resonator and a fourth quarter-wave resonator;
the first quarter-wave resonator and the second quarter-wave resonator are positioned on the same straight line, and the third quarter-wave resonator and the fourth quarter-wave resonator are positioned on the same straight line;
the first quarter-wave resonator and the second quarter-wave resonator are vertical to the third quarter-wave resonator and the fourth quarter-wave resonator;
the first quarter-wave resonator, the second quarter-wave resonator, the third quarter-wave resonator and the fourth quarter-wave resonator are connected to each other by a non-resonant node.
In the invention, the end part of the first quarter-wavelength resonator is connected with a first variable capacitance diode through a first blocking capacitor, and the end part of the first quarter-wavelength resonator is connected with a first direct-current voltage loading point through a first current limiting resistor;
the end part of the second quarter-wavelength resonator is connected with a second variable capacitance diode through a second blocking capacitor, and the end part of the second quarter-wavelength resonator is connected with a second direct-current voltage loading point through a second current limiting resistor;
the end part of the third quarter-wave resonator is connected with a third variable capacitance diode through a third blocking capacitor, and the end part of the third quarter-wave resonator is connected with a third direct-current voltage loading point through a third current limiting resistor;
the end part of the fourth quarter-wave resonator is connected with a fourth variable capacitance diode through a fourth blocking capacitor, and the end part of the fourth quarter-wave resonator is connected with a fourth direct-current voltage loading point through a fourth current limiting resistor.
In the invention, the bottom of the first varactor is connected to a metal ground plate through a first grounding column;
the bottom of the second variable capacitance diode is connected to the metal grounding plate through a second grounding column;
the bottom of the third variable capacitance diode is connected to the metal grounding plate through a third grounding column;
the bottom of the fourth varactor is connected to the metal ground plate through a fourth ground post.
In the invention, the isolation resistor is connected with the end point of the first coupling output line and the end point of the second coupling output line.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic perspective view of a reconfigurable power division filter according to the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic structural dimension diagram of example 1.
Fig. 4a is a first S-parameter simulation diagram of embodiment 1.
Fig. 4b is a simulation diagram of S parameter of example 1.
Fig. 5a is a simulation graph of the matching characteristics and the isolation characteristics S-parameters of the first output port feeder of embodiment 1.
Fig. 5b is a S-parameter simulation diagram of the matching characteristics and isolation characteristics of the second output port feeder of embodiment 1.
In fig. 1, an input port feeder 1, a first output port feeder 2, a second output port feeder 3, a first stub-loaded multimode resonator 4, a second stub-loaded multimode resonator 5, an isolation resistor 6, a polygonal dielectric substrate 7, a metal ground plate 8, a 50-ohm microstrip line conduction band 11, an impedance match line 12, a wavelength main transmission line 13, a first 50-ohm microstrip line conduction band 21, a first open-ended stub 22, a first coupling output line 23, a second 50-ohm microstrip line conduction band 31, a second open-ended stub 32, a second coupling output line 33, a first one-and-two-wavelength resonator 41, a first symmetric stub loading unit 42, a second symmetric stub loading unit 43, a second one-and-two-wavelength resonator 51, a third symmetric stub loading unit 52, and a fourth symmetric stub loading unit 53.
Detailed Description
Example 1:
as shown in fig. 1 and fig. 2, this embodiment provides a reconfigurable power division filter, which includes a rectangular dielectric substrate 7 having a metal ground plate 8 on a lower surface thereof, an input port feeder 1, a first output port feeder 2, and a second output port feeder 3 on an upper surface of the rectangular dielectric substrate 7, where the first output port feeder 2 and the second output port feeder 3 are respectively close to a same short side of the rectangular dielectric substrate 7, a multi-mode resonator 4 is disposed between the first output port feeder 2, the second output port feeder 3, and the input port feeder 1, and a first varactor 51, a second varactor 52, a third varactor 53, and a fourth varactor 54 are respectively loaded on four ports of the multi-mode resonator 4. An isolation resistor 65 is provided between the first output port feed line 2 and the second output port feed line 3.
The polygonal dielectric substrate 7 is rectangular and is symmetrical about the center line of the short side of the rectangle.
The input port feeder 1 comprises a 50-ohm microstrip line conduction band 11, an impedance matching line 12 and a wavelength main transmission line 13, wherein one end face of the 50-ohm microstrip line conduction band 11 is connected with the impedance matching line 12, the other end face of the 50-ohm microstrip line conduction band 11 is arranged on the upper bottom face of the short side of the rectangular dielectric substrate 7, and the impedance matching line 12 and the 50-ohm microstrip line conduction band 11 are connected with the end face of the wavelength main transmission line 13.
The first output port feeder line 2 comprises a first 50 ohm microstrip line conduction band 21, a first impedance match line 22 and a first coupling output line 23, one end of the first 50 ohm microstrip line conduction band 21 is located on one side of the short side of the rectangular dielectric substrate 7, the other end of the first 50 ohm microstrip line conduction band is connected with the end face of the short side of the first impedance match line 22 bent in an L shape, the long L-shaped side of the first impedance match line 22 is parallel to the vertically adjacent short side of the rectangular dielectric substrate 7 and points to the symmetric plane of the polygonal dielectric substrate 7; the first coupling output line 23 is connected perpendicularly to the L-shaped long-side end face of the first impedance match line 22.
The second output port feeder line 3 comprises a second 50 ohm microstrip line conduction band 31, a second impedance matching line 32 and a second coupling output line 33, one end of the second 50 ohm microstrip line conduction band 31 is located on one side of the short side of the rectangular dielectric substrate 7, the other end of the second 50 ohm microstrip line conduction band is connected with the end face of the short side of the second impedance matching line 32 bent in an L shape, the long side of the L shape of the second impedance matching line 32 is parallel to the vertically adjacent short side of the rectangular dielectric substrate 7 and points to the symmetric plane of the polygonal dielectric substrate 7; the second coupling output line 33 is perpendicularly connected to the L-shaped long-side end face of the second impedance matching line 32.
The multimode resonator 4 is positioned in the center of the rectangular dielectric substrate 7. The multimode resonator 4 is between the first output port feed 2 and the second output port feed 3 and input port feed 1.
The multimode resonator 4 comprises a first quarter-wave resonator 41, a second quarter-wave resonator 42, a third quarter-wave resonator 43 and a fourth quarter-wave resonator 44 interconnected by a non-resonant node 45. The first varactor 51, the second varactor 52, the third varactor 53 and the fourth varactor 54 are connected to the end faces of the first quarter-wave resonator 41, the second quarter-wave resonator 42, the third quarter-wave resonator 43 and the fourth quarter-wave resonator 44 through a first blocking capacitor 91, a second blocking capacitor 92, a third blocking capacitor 93 and a fourth blocking capacitor 94, and the bottom of the first varactor 51 is connected to the metal ground plate 8 through a first grounding column 111; the bottom of the second varactor 52 is connected to the metallic ground plate 8 through a second ground post 112; the bottom of the third varactor 53 is connected to the metallic ground plate 8 through a third ground post 113; the bottom of the fourth varactor 54 is connected to the metallic ground plate 8 through a fourth ground post 114. And are respectively and correspondingly connected with a first direct current voltage loading point 101, a second direct current voltage loading point 102, a third direct current voltage loading point 103 and a fourth direct current voltage loading point 104 through a first current limiting resistor 61, a second current limiting resistor 62, a third current limiting resistor 63 and a fourth current limiting resistor 64, so that bias voltages are loaded on the corresponding varactor diodes.
The isolation resistor 65 is connected to the end point of the first coupling output line 23 and the second coupling output line 33.
The lengths and widths of the first quarter-wave resonator 41 and the second quarter-wave resonator 42 of the multimode resonator 4 determine the positions of two transmission zeros and one pole, the lengths and widths of the third quarter-wave resonator 43 and the fourth quarter-wave resonator 44 of the multimode resonator 4 determine the positions of two poles, and adjusting the lengths and widths of the first quarter-wave resonator 41, the second quarter-wave resonator 42, the third quarter-wave resonator 43, and the fourth quarter-wave resonator 44 of the multimode resonator 4 can change the bandwidth and the center frequency of the initial pass band; by changing the dc voltage values of the first dc voltage loading point 101, the second dc voltage loading point 102, the third dc voltage loading point 103 and the fourth dc voltage loading point 104, the capacitance values of the equivalent capacitances of the first varactor diode 51, the second varactor diode 52, the third varactor diode 53 and the fourth varactor diode 54 loaded at the end points of the first quarter-wavelength resonator 41, the second quarter-wavelength resonator 42, the third quarter-wavelength resonator 43 and the fourth quarter-wavelength resonator 44 of the multimode resonator 4 can be changed, i.e., the resonant frequency thereof can be changed, thereby changing the bandwidth and the center frequency; in addition, the isolation degree of the two output ports is greatly influenced by the isolation resistor 65, and the optimal isolation degree can be obtained by adjusting the resistance value of the isolation resistor.
The embodiment processes and corrodes the metal surfaces of the front surface and the back surface of the circuit substrate in the manufacturing process through the printed circuit board manufacturing process, so that required metal patterns are formed, the structure is simple, the method can be realized on a single PCB, and the processing and integration are convenient. Meanwhile, the invention utilizes the resonance mechanism of the multimode resonator and the electric field distribution characteristic of the main transmission line to obtain good power distribution characteristic and filter characteristic, and obtains good port isolation characteristic by skillfully isolating the resistor between the resonators. The invention utilizes the multimode resonator to load the varactor and has wide center frequency and bandwidth tuning range. The reconfigurable power division filter of the invention utilizes the isolation resistor connected between the output coupling lines, has good isolation and is suitable for modern wireless communication systems. And the same filter part is shared by the two outputs, so that the use number of the variable capacitance diodes can be reduced on one hand, the size is reduced on the other hand, and the production cost is reduced. The present invention is described in further detail below.
The structure of example 1 is shown in fig. 1, the top view is shown in fig. 2, and the relevant dimensions are shown in fig. 3. The dielectric substrate 7 used had a relative dielectric constant of 3.55, a thickness of 0.508mm and a loss tangent of 0.0027. With reference to fig. 3, the size parameters of the reconfigurable power division filter are as follows: l is1＝13.8mm,L2＝15.1mm,L3＝12mm,L4＝13.8mm,L5＝10.6mm,L0＝5mm,W0＝1.18mm,W1＝0.32mm,W2＝1.4mm,W3＝0.54mm,g1＝0.1mm,g2＝0.1mm,R0＝160Ω，Rb＝10kΩ，Cb100 pF. Varactor model: d1、D3And D4Is SMV2019, D2Is SMV 1248. The total area of the reconfigurable power division filter, which does not comprise a 50 ohm microstrip line conduction band, is 40.2 multiplied by 20.4mm2The corresponding waveguide length dimension is 0.37 lambdag×0.19λgWherein λ isgThe length of the waveguide is 1.5GHz, the lowest center frequency.
The work reconfigurable sub-filter of the embodiment is simulated by joint modeling in electromagnetic simulation software HFSS.13.0 and ADS 2017. Fig. 4a and 4b are simulation diagrams of S parameters of the reconfigurable power division filter in this example, and it can be seen from the diagrams that the adjustable range of the passband center frequency of the reconfigurable power division filter is 1.5GHz-1.91GHz, the adjustable range of the passband bandwidth is 80MHz-300 MHz when the center frequency is 1.7GHz, the return loss in the passband is lower than 18dB, and the minimum insertion loss is 1.8 dB.
Fig. 5 is a simulation diagram of S parameters of matching characteristics and isolation characteristics of two power output ports of the reconfigurable power division filter in this example, and it can be seen from the diagram that return loss of the output port in the pass band of the power division filter in this example is lower than 18dB, and isolation in the pass band is better than 18 dB.
In summary, the high-selectivity broadband power division filter of this embodiment combines the field distribution characteristics of the stub-loaded multimode resonator and the open-circuit transmission line at one wavelength terminal, and uses the indirect isolation resistance of the resonator, the open-circuit stub is loaded at the output end, and the same filtering part is shared, so that a broadband power division filter with compact structure, low loss, high selectivity, good isolation, small number of diodes used, and good out-of-band rejection performance is realized.
The present invention provides a concept and a method of a reconfigurable power division filter, and a plurality of methods and ways for implementing the technical solution are provided, the above description is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, a plurality of improvements and modifications may be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (3)
1. A reconfigurable power division filter is characterized by comprising a dielectric substrate (7), wherein a metal grounding plate (8) is arranged on the bottom surface of the dielectric substrate (7), an input port feeder (1), a first output port feeder (2) and a second output port feeder (3) are respectively arranged on the dielectric substrate (7), a multimode resonator (4) is arranged between the input port feeder (1) and the first output port feeder (2) as well as between the input port feeder and the second output port feeder (3), and an isolation resistor (65) is arranged between the first output port feeder (2) and the second output port feeder (3);
the input port feeder line (1) comprises a 50 ohm microstrip line conduction band (11), an impedance matching line (12) and a wavelength main transmission line (13), one end of the 50 ohm microstrip line conduction band (11) extends to the side edge of the dielectric substrate (7), the other end of the 50 ohm microstrip line conduction band is connected with the impedance matching line (12), and the other end of the impedance matching line (12) is connected with the wavelength main transmission line (13);
the first output port feeder line (2) comprises a first 50-ohm microstrip line conduction band (21), a first impedance matching line (22) and a first coupling output line (23) which are connected in sequence, the first 50-ohm microstrip line conduction band (21) is parallel to the first coupling output line (23), and the first impedance matching line (22) is of an L-shaped structure;
the second output port feeder line (3) comprises a second 50-ohm microstrip line conduction band (31), a second impedance matching line (32) and a second coupling output line (33) which are connected in sequence, the second 50-ohm microstrip line conduction band (31) is parallel to the second coupling output line (33), and the second impedance matching line (32) is of an L-shaped structure;
the multimode resonator (4) comprises a first quarter-wave resonator (41), a second quarter-wave resonator (42), a third quarter-wave resonator (43) and a fourth quarter-wave resonator (44);
the first quarter-wave resonator (41) and the second quarter-wave resonator (42) are located on the same straight line, and the third quarter-wave resonator (43) and the fourth quarter-wave resonator (44) are located on the same straight line;
the first quarter-wave resonator (41) and the second quarter-wave resonator (42) are vertical to the third quarter-wave resonator (43) and the fourth quarter-wave resonator (44);
-the first quarter-wave resonator (41), the second quarter-wave resonator (42), the third quarter-wave resonator (43) and the fourth quarter-wave resonator (44) are interconnected by a non-resonant node (45);
the end part of the first quarter-wave resonator (41) is connected with a first variable capacitance diode (51) through a first blocking capacitor (91), and the end part of the first quarter-wave resonator (41) is connected with a first direct-current voltage loading point (101) through a first current limiting resistor (61);
the end part of the second quarter-wave resonator (42) is connected with a second varactor (52) through a second blocking capacitor (92), and the end part of the second quarter-wave resonator (42) is connected with a second direct-current voltage loading point (102) through a second current limiting resistor (62);
the end part of the third quarter-wave resonator (43) is connected with a third variable capacitance diode (53) through a third blocking capacitor (93), and the end part of the third quarter-wave resonator (43) is connected with a third direct-current voltage loading point (103) through a third current limiting resistor (63);
the end part of the fourth quarter-wave resonator (44) is connected with a fourth variable capacitance diode (54) through a fourth direct current blocking capacitor (94), and the end part of the fourth quarter-wave resonator (44) is connected with a fourth direct current voltage loading point (104) through a fourth current limiting resistor (64).
2. The reconfigurable power division filter according to claim 1, wherein the bottom of the first varactor (51) is connected to a metal ground plate (8) through a first ground post (111);
the bottom of the second varactor (52) is connected to the metal grounding plate (8) through a second grounding column (112);
the bottom of the third varactor (53) is connected to the metal ground plate (8) through a third grounding column (113);
the bottom of the fourth varactor (54) is connected to the metal ground plate (8) through a fourth grounding post (114).
3. The reconfigurable power division filter according to claim 1, wherein the isolation resistor (65) connects the first coupling output line (23) terminal with the second coupling output line (33) terminal.
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| CN113178701A (en) * | 2021-05-14 | 2021-07-27 | 西安电子科技大学 | Luneberg lens feed source antenna based on directional diagram is reconfigurable |
| CN113644429B (en) * | 2021-08-10 | 2022-08-02 | 合肥工业大学 | Planar microwave passive device capable of reconstructing four microwave functions |
| CN114039185B (en) * | 2021-11-24 | 2023-04-21 | 南京理工大学 | Broadband filtering power divider capable of realizing high power division ratio and wide isolation bandwidth |
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| CN104852112A (en) * | 2015-03-26 | 2015-08-19 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Hybrid coupler with reconfigurable frequency and phase and design method thereof |
| CN105186088A (en) * | 2015-09-12 | 2015-12-23 | 电子科技大学 | Electrically tunable filtering type power divider having harmonic suppression function |
| CN208873861U (en) * | 2018-10-31 | 2019-05-17 | 上海剑桥科技股份有限公司 | Wideband filtered power splitter based on S-band |
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| US8023921B2 (en) * | 2008-12-03 | 2011-09-20 | Bae Systems Information And Electronic Systems Integration Inc. | Quadratic amplitude control circuit for cosite interference cancellation |
| KR20140146764A (en) * | 2013-06-18 | 2014-12-29 | 한국전자통신연구원 | Power divider |
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| CN104852112A (en) * | 2015-03-26 | 2015-08-19 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Hybrid coupler with reconfigurable frequency and phase and design method thereof |
| CN105186088A (en) * | 2015-09-12 | 2015-12-23 | 电子科技大学 | Electrically tunable filtering type power divider having harmonic suppression function |
| CN208873861U (en) * | 2018-10-31 | 2019-05-17 | 上海剑桥科技股份有限公司 | Wideband filtered power splitter based on S-band |
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