CN109473756B - kinds of fully reconfigurable differential filter - Google Patents

kinds of fully reconfigurable differential filter Download PDF

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Publication number
CN109473756B
CN109473756B CN201811368029.XA CN201811368029A CN109473756B CN 109473756 B CN109473756 B CN 109473756B CN 201811368029 A CN201811368029 A CN 201811368029A CN 109473756 B CN109473756 B CN 109473756B
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microstrip
dual
mode
resonator
feeder lines
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CN109473756A (en
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翁子彬
刘序旻
田日云
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Xian University of Electronic Science and Technology
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Xian University of Electronic Science and Technology
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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

Abstract

The invention provides fully reconfigurable differential filters, which can be used for filtering in a fully reconfigurable differential circuit of a wireless communication system, and comprises a dielectric substrate, wherein two symmetrically-arranged microstrip dual-mode resonators are printed at the center of the upper surface of the dielectric substrate, two serially-connected varactor diodes are connected between opposite branches of the two microstrip dual-mode resonators, each two serially-connected varactor diodes are connected with a direct-current voltage source through a bias resistor, the two microstrip dual-mode resonators are grounded through radio-frequency yoke coils, a microstrip input feeder line and a microstrip feeder line output are respectively printed on two sides of each microstrip dual-mode resonator, and a grounding patch is printed on the lower surface of the dielectric substrate and is etched with two symmetrical slot line structures.

Description

kinds of fully reconfigurable differential filter
Technical Field
The invention belongs to the technical field of microwave communication, and further relates to fully reconfigurable differential filters in the technical field of wireless communication radio frequency, which can be used for filtering differential signals at a reconfigurable radio frequency front end in a wireless communication system.
Background
In the wireless communication technology, in order to fully utilize and fuse various different wireless channels and standards, a radio frequency front end needs to work on different frequencies, so that a reconfigurable differential filter with a tunable center frequency is needed.
The invention discloses a full-reconfigurable differential filter, which is a patent application with the application publication number of CN 105720335A and the name of compact electrically-tunable balanced band-pass filter.A variable capacitance diode is loaded on a central branch node of a dual-mode resonator, variable capacitance diodes capable of independently controlling the resonance frequency of an even mode are arranged in an even mode equivalent circuit under differential mode excitation, and the reconfigurable differential filter realizes the reconfiguration of bandwidth by adjusting the capacitance value of the variable capacitance diode.
The invention discloses full-reconfigurable differential filters, which are a patent application with the application publication number of CN 105789787A and the name of broadband balanced band-pass filters with reconfigurable frequency and bandwidth, and adopts a mode of integrating three-mode resonators, wherein two variable capacitance diodes capable of independently controlling the resonance frequency of the even mode of the resonators are arranged in an even mode equivalent circuit under the excitation of the differential mode of the filters, so that the characteristic of reconfigurable bandwidth in a wider frequency range is realized.
In summary, in the prior art, the compact fully reconfigurable differential filter does not have a wide bandwidth adjustment range, but the fully reconfigurable differential filter with the wide bandwidth adjustment range has a large size, and cannot meet the development requirement of miniaturization of the radio frequency front end.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides fully reconfigurable differential filters, ensures that the size of the existing compact fully reconfigurable differential filter is small, widens the adjustment range of bandwidth, and improves the frequency selectivity and the common mode rejection degree.
In order to achieve the purpose, the invention adopts the technical scheme that:
A full reconfigurable differential filter comprises a dielectric substrate 1, two microstrip dual-mode resonators 2 which are symmetrically arranged are printed at the central position of the upper surface of the dielectric substrate 1, two varactor diodes 3 which are mutually connected in series and have opposite anodes are connected between the opposite branches of the two microstrip dual-mode resonators 2, the connecting line of each two varactor diodes 3 which are connected in series is connected with a direct current voltage source through a bias resistor 4, a microstrip input feeder line 6 and a microstrip output feeder line 7 are respectively printed at the two sides of each microstrip dual-mode resonator 2, the two microstrip input feeder lines 6 are positioned at the same side surfaces of the two dual-mode resonators 2, the two microstrip input feeder lines 6 and the two microstrip output feeder lines 7 are both symmetrical about the symmetrical axis of the two microstrip dual-mode resonators 2, a grounding patch 8 is printed at the lower surface of the dielectric substrate 1, the grounding patch 8 is connected with the terminals of the two microstrip input feeder lines 6 and the two microstrip output feeder lines 7 through a metalized via 9, the other ends of the two microstrip yoke loops 5 are respectively connected with the microstrip dual-mode resonators 2, the microstrip dual-mode resonator 2 adopts an I-shaped structure which comprises a microstrip central branch 3921, two second microstrip input feeder lines 56 connected with the corresponding branches connected with the bent slot ends of the microstrip dual-mode resonators, and two microstrip dual-mode resonators (10) and two microstrip dual-loop structures (connected with the bent slot insert structures) connected with the two microstrip dual-mode resonators 2, and the two microstrip dual-band resonator 3.
In the fully reconfigurable differential filters, the symmetry axes of the two microstrip dual-mode resonators 2 arranged symmetrically pass through the geometric center of the upper surface of the dielectric substrate 1.
In the fully reconfigurable differential filters, in the microstrip dual-mode resonator 2, the two -th curved branches 22 and the two second curved branches 23 are symmetrical with respect to the central microstrip line 21, and the symmetry axis of the microstrip dual-mode resonator passes through the geometric center of the upper surface of the dielectric substrate 1 and is perpendicular to the symmetry axis of the two dual-mode resonators 2.
In the fully reconfigurable differential filters, the microstrip input feed line 6 and the microstrip output feed line 7 printed on both sides of the microstrip dual-mode resonator 2 are symmetrical with respect to the symmetry axis of the microstrip dual-mode resonator 2.
In the fully reconfigurable differential filters, the microstrip input feed line 6 has the same structure as the microstrip output feed line 7.
In the fully reconfigurable differential filters, the microstrip input feeder 6 is composed of an L-shaped 50-ohm microstrip conduction band and a coupling feeder connected with the metalized via hole 9, and the coupling feeder is coupled with the bent branch 22 in parallel.
In the fully reconfigurable differential filters, the slot line structure 10 is in a straight line shape, is parallel to the symmetry axes of the two dual-mode resonators 2, and is perpendicular to the arms of the conduction band of the 50 ohm microstrip line.
Compared with the prior art, the invention has the following advantages:
, because the invention adopts the mode of integrating I-shaped dual-mode resonators, varactors can independently adjust the resonance frequency of the even mode in the resonator even mode equivalent circuit under the excitation of the differential mode, thereby realizing the reconstruction of the working bandwidth in a wider frequency band range on the premise of smaller device size, and improving the adjusting capability of the working bandwidth of the fully-reconfigurable differential filter on the premise of not increasing the device size.
Secondly, the mode of etching the slot line structure on the grounding patch is adopted, lower stop band zeros are introduced into the amplitude-frequency response under differential mode excitation, so that the frequency selectivity of the fully reconfigurable differential filter is effectively improved, zeros are introduced into the differential mode working frequency range in the amplitude-frequency response under even mode excitation, and the common mode rejection degree of the fully reconfigurable differential filter is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a dual-mode resonator according to the present invention;
FIG. 3 is a schematic diagram of the input/output feed line structure of the present invention;
FIG. 4 is a schematic diagram of the mutual positional relationship of the dual-mode resonator and the input/output feeder of the present invention;
FIG. 5 is a schematic view of the lower surface of the present invention;
FIG. 6 is an equivalent circuit diagram of a dual-mode resonator, an odd-mode equivalent circuit diagram of the dual-mode resonator and an even-mode equivalent circuit diagram of the dual-mode resonator under differential mode excitation according to the present invention;
FIG. 7 is an equivalent circuit diagram of a dual-mode resonator, an odd-mode equivalent circuit diagram of the dual-mode resonator and an even-mode equivalent circuit diagram of the resonator under common-mode excitation according to the present invention;
FIG. 8(a) is a graph of the variation of the differential mode resonance frequency and the common mode resonance frequency of a dual-mode resonator under different Cv1 conditions according to the present invention;
FIG. 8(b) is a graph of the variation of the differential mode resonance frequency and the common mode resonance frequency of the dual-mode resonator under different Cv2 according to the present invention;
FIG. 9 is the S of the fully reconfigurable differential filter of the present inventiondd11And Sdd21A parameter simulation and actual measurement curve chart;
FIG. 10 is the S of the fully reconfigurable differential filter of the present inventioncc21A parameter simulation and actual measurement curve chart;
FIG. 11(a) shows the case when V1＝8V、V2When the voltage is 3-4.2V, a bandwidth change curve graph of the fully reconfigurable differential filter is obtained;
FIG. 11(b) is a graph showing the following equation when V1＝22V、V2When the voltage is 5-8V, fully reconfigurable differential filteringThe bandwidth of the device varies the graph.
Detailed description of the invention
The invention is described in further detail with reference to the figures and the examples.
Referring to fig. 1, the dielectric substrate 1 is made of F4B-2, the relative dielectric constant is 2.65, the loss tangent is 0.001, and the thickness is 1 mm. two microstrip dual-mode resonators 2 which are symmetrically arranged are printed at the center of the upper surface of the dielectric substrate, two varactor diodes 3 which are connected in series and have opposite anodes are connected between the opposite branches of the two microstrip dual-mode resonators 2, the connecting line of each two series varactor diodes 3 is connected with a direct-current voltage source through a bias resistor 4, and radio-frequency choke coils 5 are respectively connected to the central microstrip line 21 of the two microstrip dual-mode resonators 2.
Referring to fig. 2, the microstrip dual-mode resonator 2 adopts an i-shaped structure, and includes a central microstrip line 21, two -th bent branches 22 connected with ends of the central microstrip line, and two second bent branches 23 connected with ends of the central microstrip line, wherein the two -th bent branches 22 and the two second bent branches 23 are symmetrical with respect to the central microstrip line 21, the symmetry axis of the two second bent branches 23 passes through the geometric center of the upper surface of the dielectric substrate 1 and is perpendicular to the symmetry axis of the two dual-mode resonators 2, and the length of the central microstrip line 21 is L1Width of W1Said th bent branch 22 has a length L2Width of W2The length of the second bending branch 23 is L3Width of W3. The invention selects variable capacitance diodes SMV1405-079LF and SMV1233-079LF of SKYWORKS company as C respectivelyV1And CV2。
Referring to fig. 3, the microstrip feed line consists of an L-shaped 50-ohm microstrip conduction band and a coupling feed line connected to the metalized via 9. Wherein the length of the coupling feed line is L4Width of W4The length of the conduction band of the 50 ohm microstrip line is L5Width of W5。
Referring to fig. 4, the distance between the centers of the two microstrip dual-mode resonators is L6. Two sides of each microstrip dual-mode resonator 2 are respectively printedThe microstrip dual-mode resonator is provided with a microstrip input feed line 6 and a microstrip output feed line 7, the two microstrip input feed lines 6 are positioned on the same side surfaces of the two dual-mode resonators 2, and the coupling gap between the input/output feed line and the microstrip dual-mode resonator is S1. The two microstrip input feed lines 6 and the two microstrip output feed lines 7 are symmetrical about the symmetry axis of the two microstrip dual-mode resonators 2, and the distance between the input ends of the two microstrip input feed lines 6 is L7. The microstrip input feed line 6 and the microstrip output feed line 7 have the same structure and are symmetrical about the symmetry axis of the microstrip dual-mode resonator 2, and the distance between the 50 ohm microstrip line conduction bands is L8。
Referring to fig. 5, two slot line structures 10 symmetrical with respect to the symmetry axes of the two microstrip dual-mode resonators 2 are etched on the ground patch 8, and the shape of the slot line structures is a straight line. Each slot line structure 10 has a length L9Width of W6The distance between the two slot line structures is L10。
The operating principle of the present invention is that when a differential mode signal is input from an input port, the plane of symmetry a-a' forms electrically isolated walls, the varactor diodes are equivalently grounded, and the equivalent circuit of the resonator under differential mode excitation is as shown in fig. 6(a) it can be seen from fig. 6(a) that the equivalent circuit of the resonator under differential mode excitation is left-right symmetric, so that an analysis can be performed using an odd-even mode analysis method, in the odd-mode state, the middle line of symmetry of the differential mode equivalent circuit is equivalently short-circuited, the left end of the th bending branch is connected to varactor Cv1, while the right end is equivalently grounded, the overall equivalent is quarter wavelength resonator loaded with varactor Cv1, as shown in fig. 6(b), the resonance frequency fdd _ odd of the equivalent quarter wavelength resonator can be adjusted by Cv1, in the even-mode state, the middle line of the differential mode equivalent circuit is equivalently open, the th bending branch is connected to varactor Cv 24, the passband is connected to varactor cd 24, the passband 35, the passband is adjusted by a microstrip line under the odd-even-mode equivalent frequency equivalent passband, the passband is adjusted by the odd-mode equivalent frequency waveguide equivalent waveguide as shown in the odd-band as , the waveguide equivalent waveguide equivalent waveguide under the waveguide equivalent waveguide under the waveguide under the waveguide under the waveguide under the waveguide equivalent waveguide under the waveguide.
When a common-mode signal is input from an input port, a symmetry plane A-A' forms magnetic isolation walls, the varactor diode is equivalently open and can be ignored, a resonator equivalent circuit under common-mode excitation is shown in figure 7(a), the resonator common-mode equivalent circuit is bilaterally symmetric, so that even-odd mode analysis can be carried out on the resonator common-mode equivalent circuit, in an odd-mode state, the common-mode equivalent circuit is equivalently short-circuited on a middle line, which is equivalent to traditional quarter wavelength resonators, as shown in figure 7(b), a resonance frequency fcc _ odd is irrelevant to both the varactor diodes Cv1 and Cv2, so that the common-mode resonance frequency can be separated from a differential-mode resonance frequency to achieve the effect of common-mode rejection, in an even-mode state, the common-mode equivalent circuit is equivalently open, which is equivalent to both the half-resonance wavelength resonators, as shown in figure 7(c), the even-mode frequency fcc _ even of the common-mode equivalent circuit is irrelevant to both the varactor diodes Cv1 and Cv2 to achieve the effect of common-mode rejection.
8(a) and 8(b) show the differential mode resonance frequency and the even mode resonance frequency curve under different Cv1 and Cv2, respectively, it can be seen that the differential mode resonance frequency is below 2GHz, and the common mode resonance frequency is above 3GHz, and basically keeps unchanged.
The design parameters of the differential filter are shown in the table. The total area of the fully reconfigurable balanced filter based on the I-shaped structure is 43.3 multiplied by 24.0mm, corresponding to a guided wave length of 0.14 lambdag×0.11λgWherein λ isgTo tune the waveguide wavelength for the center frequency of the range.
The full reconfigurable balanced filter parameter table unit based on the I-shaped structure comprises the following steps: mm is
L1 L2 L3 L4 L5 L6
3.51 15.75 8.10 12.58 21.53 17.41
L7 L8 L9 L10 W1 W2
43.67 6.95 14.77 27.58 2.10 0.31
W3 W4 W5 S1
0.90 0.65 2.71 0.20
The beneficial effects of the invention of effectively widening the adjustment range of the working bandwidth and improving the frequency selectivity and the common mode rejection degree are further explained in by combining simulation experiments and actual measurement results as follows:
s obtained by simulation under different working center frequenciesdd11Modulus value ofdd11I and Sdd21Modulus value ofdd21I changes with frequency and S obtained by actual measurementdd11Modulus value ofdd11I and Sdd21Modulus value ofdd21The variation of | with frequency is plotted as the curve shown in fig. 9. S obtained by simulation under different working center frequenciescc21Modulus value ofcc21I changes with frequency and S obtained by actual measurementcc21Modulus value ofcc21The variation of | with frequency is plotted as a curve as shown in FIG. 10A wire. FIG. 11(a) shows the case when V1＝8V、V2And when the voltage is 3-4.2V, a bandwidth change curve graph of the fully reconfigurable differential filter is obtained. FIG. 11(b) is a graph showing the following equation when V1＝22V、V2And when the voltage is 5-8V, a bandwidth change curve graph of the fully reconfigurable differential filter is obtained. In fig. 9 to 11, the abscissa indicates frequency in GHz, and the ordinate indicates simulation and actual measurement parameters in dB.
It can be seen from fig. 9 that, for the differential mode signal, the adjustment range of the operating center frequency of the differential filter is 0.99 GHz-1.87 GHz, the relative adjustment range is 61.5%, the insertion loss is between 5.1dB and 2.3dB, the return loss is greater than 15dB, transmission zeros are provided in the lower stop band, and the differential filter has good frequency selectivity.
As can be seen from fig. 11, when the differential mode center operating frequencies of the fully reconfigurable balanced filter are 1.5GHz and 1.78GHz, respectively, the adjustment range of the differential mode operating bandwidth is 70MHz to 230MHz, the relative bandwidth is 4.67% to 15.33%, the return loss is above 10dB, and the adjustment range of the differential mode operating bandwidth is wider.

Claims (7)

  1. The fully reconfigurable differential filter comprises a dielectric substrate (1), two microstrip dual-mode resonators (2) which are symmetrically arranged are printed at the central position of the upper surface of the dielectric substrate (1), two varactor diodes (3) which are mutually connected in series and have opposite positive poles are connected between opposite branches of the two microstrip dual-mode resonators (2), a connecting line of each two series varactor diodes (3) is connected with a direct-current voltage source through a bias resistor (4), microstrip input feeder lines (6) and microstrip output feeder lines (7) are respectively printed on two sides of each microstrip dual-mode resonator (2), two microstrip input feeder lines (6) are positioned on the same side surfaces of the two dual-mode resonators (2), the two microstrip input feeder lines (6) and the two microstrip output feeder lines (7) are symmetrical about the symmetrical axes of the two microstrip dual-mode resonators (2), a grounding patch (8) is printed on the lower surface of the dielectric substrate (1), the grounding patch (8) is connected with two microstrip input feeder lines (6) and two microstrip output feeder lines (7) through metallized through vias (9), the two microstrip input feeder lines (6) and two microstrip output feeder lines (7) are connected with a terminal of a bent microstrip loop structure, the two microstrip dual-mode resonators (2) and a bent yoke structure of a curved loop (395) is connected with a second microstrip resonator (2), the two microstrip dual-mode resonator (34) of which is connected with a microstrip input microstrip dual-mode resonator (2), the two microstrip dual-mode resonator (2), the microstrip resonator (2), the two microstrip dual-mode resonator (2), the two microstrip input feeder lines (2) and the two microstrip dual-mode resonator (2) are connected with the two microstrip dual-mode resonator (2).
  2. 2. The fully reconfigurable differential filter according to claim 1, wherein the two microstrip dual-mode resonators (2) arranged symmetrically have their symmetry axes passing through the geometric center of the upper surface of the dielectric substrate (1).
  3. 3. The fully reconfigurable differential filter according to claim 1, wherein the microstrip dual-mode resonator (2) has two bent branches (22) and two second bent branches (23) that are symmetrical with respect to the central microstrip line (21), and the symmetry axis of the microstrip dual-mode resonator passes through the geometric center of the upper surface of the dielectric substrate (1) and is perpendicular to the symmetry axis of the two dual-mode resonators (2).
  4. 4. fully reconfigurable differential filter according to claim 1, characterized in that the microstrip dual-mode resonator (2) has its microstrip input feed line (6) and microstrip output feed line (7) printed on both sides symmetrically with respect to the axis of symmetry of the microstrip dual-mode resonator (2).
  5. 5. fully reconfigurable differential filter according to claim 1, characterized in that the microstrip input feed line (6) is structurally identical to the microstrip output feed line (7).
  6. 6. The fully reconfigurable differential filter according to claim 1, characterized in that, the microstrip input feed line (6) is composed of an "L" -shaped 50 ohm microstrip conduction band and a coupling feed line connected to the metalized via (9), and the coupling feed line is coupled in parallel with the th bent stub (22).
  7. 7. fully reconfigurable differential filter according to claim 6, characterized in that the slot line structure (10) has the shape of a straight line, parallel to the symmetry axes of the two dual-mode resonators (2) and perpendicular to the arms of the 50 ohm microstrip line conduction band.
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CN110504945B (en) * 2019-08-05 2022-12-02 电子科技大学 Reconfigurable annular filtering device
CN111740188B (en) * 2020-06-12 2021-09-28 北京邮电大学 High-selectivity balanced band-pass full-frequency common-mode rejection passband internal common-mode absorption filter
CN114584074B (en) * 2022-01-14 2023-07-18 电子科技大学 Miniaturized frequency-selecting structure and application thereof in low-phase-noise microwave oscillator
CN115412112B (en) * 2022-07-12 2023-08-15 北京中科睿谱科技有限公司 Frequency band, bandwidth adjustable differential transceiver

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