CN104979605A - Filter with reconfigurable coupling coefficient - Google Patents
Filter with reconfigurable coupling coefficient Download PDFInfo
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- CN104979605A CN104979605A CN201510426561.2A CN201510426561A CN104979605A CN 104979605 A CN104979605 A CN 104979605A CN 201510426561 A CN201510426561 A CN 201510426561A CN 104979605 A CN104979605 A CN 104979605A
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- coupling coefficient
- variable capacitor
- microstrip line
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Abstract
The invention provides a filter with a reconfigurable coupling coefficient. The filter comprises resonators, an interdigital capacitor, a microstrip line and a variable capacitor and is characterized in that the microstrip line with the length of 1 is led at any position between two adjacent resonators, the mutual coupling is led to the two resonators in the form of the interdigital capacitor, at the same time the variable capacitor is loaded at the middle part of the microstrip line with the length of 1, and the coupling coefficient between the two adjacent resonators formed based on the above structure is changeable. According to the filter, through the conception of leading an interdigital capacitor structure and combining the variable capacitor, the adjustment of a coupling coefficient controllable part is realized, the ratio between the capacitance of the two parts can be arbitrarily set according to design needs, and thus the needed reconstruction amount can be designed and realized by the filter for the coupling coefficients under different indicators, which means that the filter has general applicability in a certain range.
Description
Technical field
Patent of the present invention belongs to microwave engineering techniques field, refers more particularly to one and is convenient to realize the reconfigurable filter of coupling coefficient.
Background technology
Microstrip bandpass filter design is normally chosen suitable low-pass prototype according to index request and is carried out comprehensively, then by the concrete component value obtaining required design of filter after frequency and impedance transformation, finally by (or in parallel) resonator of respectively connecting in circuit by microstrip line equivalent substitution.Simultaneously, the coupling coefficient matrix that between adjacent resonators, existence one is relevant to design band bandwidth.
Usually, centre frequency is F
0, the filter that relative bandwidth is determined, according to its design exponent number N just unique corresponding coupling coefficient matrix M, the coupling coefficient M between its adjacent resonators
i,jjust uniquely determine.Along with the extensive use of frequency adjustable filter and developing rapidly of tunable technology, electrically tunable filter has been applied to PCS Personal Communications System, frequency agility receiving system, satellite communication, radar system etc. more and more widely, plays a part more and more important in microwave system.
Existing electrically tunable filter is typically designed to regulable center frequency, controlled, but seldom has pertinent literature report to have technology that is controlled to coupling coefficient in filter design procedure and any reconstruct.Therefore under the prior art, the tuning result of usual electrically tunable filter to be difficult to ensure that in whole frequency change process absolute bandwidth is fixed and function admirable in being with, and tuning range cannot realize wide-band tuning by the restriction of coupling coefficient matrix M greatly.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, propose the reconfigurable filter of a kind of coupling coefficient, by introducing fork value capacitance structure in conjunction with the adjustment of this conception of variable capacitor realization to coupling coefficient controllable part.
Technical solution of the present invention is, there is provided a kind of coupling coefficient reconfigurable filter, comprise resonator, insert finger electric capacity, microstrip line and variable capacitor, it is characterized in that: between two adjacent resonators, the microstrip line that length is l is drawn in any position, with the form of slotting finger electric capacity, mutual coupling is introduced to these two resonators, be loaded with a variable capacitor in the microstrip line middle part that length is l simultaneously, variable based on coupling coefficient between above formation two adjacent resonators.
Further, described microstrip line length l meets l < λ/4 or λ/8.
Further, described resonator adopts the open-circuit line structure of length lambda/2, or employing length is the short-circuit line realization of λ/4.
Further, described variable capacitor is specially variable capacitance diode or MEMS or piezoelectric transducer.
Further, described filter is connected with programmable power supply, the program-controlled change of capacitance of described variable capacitor.
Beneficial effect of the present invention is embodied in: by by coupling coefficient K between two resonators adjacent in conventional filter design process
i, jbe designed to the coupling coefficient M that resonator self spacing d is Variable Control
i, jand the coupling coefficient to be controlled by variable capacitor
realize together, form coupling coefficient K
i, jprogram control restructural.What the method was more traditional is only that unitary variant is compared by adjacent resonators self spacing d, significantly increase the degree of freedom of the circuit material object debugging to machine-shaping, especially for the filter be made up of special substrate material (as: high temperature superconduction wave filter).Filter of the present invention realizes coupling coefficient controllable part in conjunction with this conception of variable capacitor by introducing fork value capacitance structure
adjustment, and the ratio of both capacitances can be arranged arbitrarily according to design requirement, makes this filter can design the reconstruct amount required for realization to the coupling coefficient under different index, and namely this filter has the general applicability in certain limit.
Accompanying drawing explanation
Fig. 1 is the structural representation between conventional filter adjacent resonators;
Fig. 2 is the structural representation in the present invention between adjacent resonators;
Fig. 3 is specific embodiments of the invention circuit model;
Fig. 4 is the simulation result of the specific embodiment of the invention;
The coupling coefficient reconstruct curve of Fig. 5 for converting in embodiment of the present invention simulation result.
Embodiment
Below in conjunction with the drawings and specific embodiments, further elaboration is made to the present invention.
As the structural representation that Fig. 1 is between conventional filter adjacent resonators, comprise resonator 1 and fixed capacity 2.
Be illustrated in figure 2 the structural representation between the adjacent resonators in filter of the present invention, the reconfigurable filter of a kind of coupling coefficient, comprise resonator 1, insert and refer to electric capacity (wherein, adopt to insert and refer to that electric capacity is by calculating corresponding capacitance, be convenient to model extraction and accurate Calculation), microstrip line and variable capacitor 3, between two resonators 1, the microstrip line that length is l is drawn in any position, with the form of slotting finger electric capacity, mutual coupling is introduced to these two resonators 1, simultaneously length is that the microstrip line middle part of l is loaded with a variable capacitor 3, variable based on coupling coefficient between above formation two adjacent resonators.
Preferably, described microstrip line length l meets l < λ/4 or λ/8 (self form resonance frequency while that this restriction being to avoid microstrip line to introduce coupling and be distal to 2F0 place, avoid the excess loss brought due to the introducing of variable capacitor simultaneously).
Preferably, described resonator 1 adopt length be λ/2 open-circuit line structure, or adopt length be λ/4 short-circuit line realize.
Preferably, described variable capacitor 3 is specially variable capacitance diode or MEMS or piezoelectric transducer.
Preferably, described filter is connected with programmable power supply, and described programmable power supply is for changing the capacitance of variable capacitor 3.
Preferably can embodiment as one, select length to be the open-circuit line structure resonator 1 of λ/2.
Figure 3 shows that specific embodiments of the invention circuit model, comprise and insert finger electric capacity, variable capacitor and two resonators.
Figure 4 shows that the simulation result of the specific embodiment of the invention, embodiment adopts can testing by power transformation capacitor of 6 groups of different capacitances, and the capacitance of variable capacitor is respectively 1PF, 2PF, 3PF, 4PF, 5PF and 10PF.As we know from the figure, when variable capacitor capacitance is less, when being 1pF, be coupled between resonator the strongest; And when its capacitance is 5pF, be coupled relative to weakening to some extent before between resonator; When variable capacitor capacitance is adjusted to 10pF the most at last, realize coupling be close to initial half.
Figure 5 shows that the coupling coefficient reconstruct curve converted in embodiment of the present invention simulation result, visible, along with the change of variable capacitor capacitance, the coupling coefficient between resonator also changes thereupon.Intuitively can find out from figure, be coupled between resonator with the variable capacitor capacitance increase of access and reduce.When variable capacitor capacitance is changed to: during 1pF → 10pF, between resonator, couple variations is 0.010131 → 0.005947.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make according to these technology disclosed by the invention enlightenment and variously not depart from other various concrete distortion and combination of the present invention, and these distortion and combination are still in protection scope of the present invention.
Claims (4)
1. the reconfigurable filter of coupling coefficient, comprise resonator, insert finger electric capacity, microstrip line and variable capacitor, it is characterized in that: between two adjacent resonators, the microstrip line that length is l is drawn in any position, with the form of slotting finger electric capacity, mutual coupling is introduced to these two resonators, simultaneously length is that the microstrip line middle part of l is loaded with a variable capacitor, forms a part of variable coupling between two adjacent resonators based on above.
2. the reconfigurable filter of coupling coefficient according to claim 1, is characterized in that: described microstrip line length l meets l < λ/4 or λ/8.
3. the reconfigurable filter of coupling coefficient according to claim 1, is characterized in that: the open-circuit line structure resonator of described resonator to be length be λ/2, or adopts length to be that the short-circuit line of λ/4 realizes.
4. the reconfigurable filter of coupling coefficient according to the arbitrary claim of claim 1-3, is characterized in that: described variable capacitor is specially variable capacitance diode or MEMS or piezoelectric transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510426561.2A CN104979605A (en) | 2015-07-20 | 2015-07-20 | Filter with reconfigurable coupling coefficient |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510426561.2A CN104979605A (en) | 2015-07-20 | 2015-07-20 | Filter with reconfigurable coupling coefficient |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5888942A (en) * | 1996-06-17 | 1999-03-30 | Superconductor Technologies, Inc. | Tunable microwave hairpin-comb superconductive filters for narrow-band applications |
| WO2002099923A1 (en) * | 2001-04-17 | 2002-12-12 | Paratek Microwave, Inc. | Hairpin microstrip line electrically tunable filters |
| US20080242550A1 (en) * | 2007-03-29 | 2008-10-02 | Fujitsu Limited | Tunable filter and method for fabricating the same |
| CN101841077A (en) * | 2010-04-30 | 2010-09-22 | 中国科学院物理研究所 | Tunable filter resonator and manufacturing method thereof |
| CN102544651A (en) * | 2011-12-27 | 2012-07-04 | 南开大学 | Miniaturized superconducting filter with multiple transmission zero points |
-
2015
- 2015-07-20 CN CN201510426561.2A patent/CN104979605A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5888942A (en) * | 1996-06-17 | 1999-03-30 | Superconductor Technologies, Inc. | Tunable microwave hairpin-comb superconductive filters for narrow-band applications |
| WO2002099923A1 (en) * | 2001-04-17 | 2002-12-12 | Paratek Microwave, Inc. | Hairpin microstrip line electrically tunable filters |
| US20080242550A1 (en) * | 2007-03-29 | 2008-10-02 | Fujitsu Limited | Tunable filter and method for fabricating the same |
| CN101841077A (en) * | 2010-04-30 | 2010-09-22 | 中国科学院物理研究所 | Tunable filter resonator and manufacturing method thereof |
| CN102544651A (en) * | 2011-12-27 | 2012-07-04 | 南开大学 | Miniaturized superconducting filter with multiple transmission zero points |
Non-Patent Citations (3)
| Title |
|---|
| JIANG LONG; CHANGZHI LI; WANZHAO CUI; JIANGTAO HUANGFU;LIXIN RAN: "a tunable microstrip bangpass filter with two independently adjustable transmission zeros", 《IEEE》 * |
| 陈依军，胡柳林，刘云刚，金珠: "零点可控的1/4波长谐振器滤波器", 《通信技术》 * |
| 高葆新，林刚: "半波长微带谐振器滤波器", 《1991年全国微波毫米波会议》 * |
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Application publication date: 20151014 |