CN103956545A - Microwave four-frequency band pass filter - Google Patents
Microwave four-frequency band pass filter Download PDFInfo
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- CN103956545A CN103956545A CN201410167042.4A CN201410167042A CN103956545A CN 103956545 A CN103956545 A CN 103956545A CN 201410167042 A CN201410167042 A CN 201410167042A CN 103956545 A CN103956545 A CN 103956545A
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Abstract
The invention discloses a microwave four-frequency band pass filter, and belongs to the field of multi-frequency band pass filters. A plurality of dual-frequency band elimination units are embedded in a dual-frequency band pass filter to form the microwave four-frequency band pass filter. A plurality of double-mode resonators are cascaded through transmission lines to form each dual-frequency band pass filter. Each dual-frequency band elimination unit is loaded in the middle of the transmission line through which the corresponding double-mode resonators are connected. Each double-mode resonator is formed by connecting an open circuit stub with a short circuit stub in parallel. Each dual-frequency band elimination unit is formed by connecting two open circuit stubs with different lengths in parallel. Restraining frequency points of each dual-frequency band elimination unit are located within two passing band frequency ranges of the dual-frequency band pass filter. The circuit mutual-embedment method is adopted, no complex coupling network is needed, the circuit is compact, the area use efficiency of the circuit is high, the isolation between the passing bands is high, the PCB process can be used, the microwave four-frequency band pass filter is obtained in the form of a micro-strip circuit, the cost is low, and no debugging is needed.
Description
Technical field
The present invention relates to multifrequency band-pass filter field, relate in particular to a kind of four band-pass filters.
Background technology
The implementation of existing multifrequency band-pass filter generally has following several:
1) a plurality of single-pass band filters scheme in parallel.Use many group resonators to realize multifrequency band-pass filter, each group resonator is realized respectively a passband, has independent or shared coupling network.The actual resonator of quantity times over single-pass band filter that used of this multifrequency band-pass filter, add and will arrange complicated coupling network, circuit structure arrangement is very narrow, if realize high-order multifrequency band-pass filter, the arrangement meeting of circuit structure is more difficult.The circuit efficiency of this filter is low, and size is larger.
2) be with logical, band stop filter concatenated schemes.Design respectively a band pass filter and a band stop filter, their cascades can be realized to double frequency band-pass filtering.This scheme has designed respectively two different filters, more loaded down with trivial details.And by two filter cascades, its cumulative volume is larger.
3) multimode resonator (for example step electric impedance resonator SIR) scheme.A plurality of modes of resonance of multimode resonator are used for realizing a plurality of passbands.The advantage of this scheme is that circuit efficiency is high, but design difficulty is larger.A plurality of passbands are used same set of coupling network, are difficult to reach the needed coupling coefficient of each passband simultaneously, are therefore difficult to control respectively the bandwidth of each passband.
4) be with logical, the mutual embedding scheme of band stop filter.This scheme is by the step electric impedance resonator without capacitive load and have the step electric impedance resonator of capacitive load to be alternately loaded on a main transmission line.This scheme advantage is that circuit is compact, but needs welding electric capacity in addition, and the capacitance error of electric capacity can affect band-pass behavior, and its debugging difficulty is larger.
Summary of the invention
Technical problem to be solved by this invention is for the defect in background technology, a kind of microwave four band-pass filters are provided, to solve the problems such as coupled structure complexity, the difficult adjusting of bandwidth, have avoided the components and parts such as loading capacitance simultaneously, only use PCB technique to realize, without debugging.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of microwave four band-pass filters, comprise at least N dual-mode resonator and N-1 Double-frequency band elimination unit, N is more than or equal to 2 natural number, and described Double-frequency band elimination unit loads on successively between described dual-mode resonator, by connecting line, is connected with described dual-mode resonator.
As the further prioritization scheme of a kind of microwave four band-pass filter of the present invention, described dual-mode resonator is in parallel and realize by a closed stub and open stub.
As the further prioritization scheme of a kind of microwave four band-pass filter of the present invention, described Double-frequency band elimination unit is realized by two different open stub parallel connections.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. simple circuit, does not need to use complicated coupling network, and the mutual embedding form of circuit makes circuit compact, and circuit area service efficiency is high;
2. can more easily regulate centre frequency and the bandwidth of each passband;
3. between passband, there is transmission zero, so there is larger isolation;
4. can use PCB technique, with the processing of microstrip circuit form, realize, without debugging.
Accompanying drawing explanation
Fig. 1 is the structural representation of double frequency band-pass filter;
Fig. 2 is the structural representation of Double-frequency band elimination unit;
Fig. 3 is the present invention's four band-pass filter topological structure schematic diagrames;
Fig. 4 is the instance graph of the present invention's four band-pass filters;
Fig. 5 is transfer curve and the coverage diagram of emulation of the present invention.
In figure, 1-dual-mode resonator, 2-Double-frequency band elimination unit, 3-connect transmission line.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Fig. 1 has provided a kind of structural representation of double frequency band-pass filter.Dual-mode resonator is formed in parallel by a closed stub and an open stub, and two mode of resonance is respectively used to realize the roughly frequency of two passbands.Adjacent dual-mode resonator is done coupling by transmission line and is produced two passbands.By regulating centre frequency and the bandwidth that the characteristic impedance, electrical length of closed stub and open stub can optimal design passband.
Fig. 2 is Double-frequency band elimination cellular construction schematic diagram.It is to be composed in parallel by two different open stub.Each stub, when its length is when certain frequency is quarter-wave, its input impedance is zero, is equivalent to short circuit.Each Double-frequency band elimination unit is on being loaded into the main transmission line of double frequency band-pass filter time, and in two passbands of double frequency band-pass filter, each load(ing) point place is equivalent to short circuit, can form two transmission zeros.By regulating characteristic impedance and the electrical length of each open stub of Double-frequency band elimination unit, can control the frequency position at two transmission zero places.
Fig. 3 is four band-pass filter topological structure schematic diagrames of the present invention.It is that the Double-frequency band elimination unit in Fig. 2 is embedded in the double frequency band-pass filter in Fig. 1, forms a dual-mode resonator and Double-frequency band elimination units alternately and is loaded into the filter structure on main transmission line.Regulate the characteristic impedance of two open stub in Double-frequency band elimination unit and the size of electrical length, two inhibition frequencies of its generation are dropped on respectively in two passbands of double frequency band-pass filter.Final several such Double-frequency band elimination unit can be in two passbands of double frequency band-pass filter stopband of each self-forming, thereby two passbands are divided into two respectively, form four passbands, realize four band-pass filters.The circuit parameter of four final band-pass filters can extract by simulation software optimization.
Be illustrated in figure 4 the practical examples of four band-pass filters.Wherein comprise four dual-mode resonators and three Double-frequency band elimination unit, Double-frequency band elimination unit is carried in the midpoint of the transmission line between adjacent two dual-mode resonators.The design passband of this four band-pass filter is: 1.4-1.7GHz, 2.1-2.3GHz, 3.3-3.6GHz and 5-5.3GHz.Through software optimization and parameter extraction, the characteristic impedance of each stub of acquisition and electrical length parameter are as shown in the table:
| Z 0(Ω) | 50.12 | E 0(deg@2GHz) | 51.1 |
| Z 1(Ω) | 38.414 | E 1(deg@2GHz) | 26.658 |
| Z 2(Ω) | 22.326 | E 2(deg@2GHz) | 36.207 |
| Z 11(Ω) | 99.3 | E 11(deg@2GHz) | 64.84 |
| Z 12(Ω) | 147.37 | E 12(deg@2GHz) | 54.46 |
| Z 21(Ω) | 22.855 | E 21(deg@2GHz) | 64.668 |
| Z 22(Ω) | 13.837 | E 22(deg@2GHz) | 39.236 |
| Z S1(Ω) | 138.68 | E S1(deg@2GHz) | 42.641 |
| Z X1(Ω) | 117.22 | E X1(deg@2GHz) | 95.151 |
| Z S2(Ω) | 91.875 | E S2(deg@2GHz) | 37.979 |
| Z X2(Ω) | 60.01 | E X2(deg@2GHz) | 98.73 |
| Z S2(Ω) | 145.93 | E S3(deg@2GHz) | 42.824 |
| Z X2(Ω) | 127.37 | E X3(deg@2GHz) | 97.289 |
Fig. 5 has provided transfer curve S21 and the coverage diagram S11 of this filter emulation.Four passbands are from low frequency to high frequency, smooth in band, and corresponding return loss is respectively 19dB, 18dB, 17dB, 16dB.Isolation between passband is all greater than 60dB.
This filter can use the transmission line form processing such as microstrip line, strip line to realize.If wherein use the form of microstrip circuit, can use PCB technique, cost is low, without debugging.
Claims (3)
1. microwave four band-pass filters, it is characterized in that, comprise at least N dual-mode resonator and N-1 Double-frequency band elimination unit, N is more than or equal to 2 natural number, and described Double-frequency band elimination unit loads on successively between described dual-mode resonator, by connecting line, is connected with described dual-mode resonator.
2. microwave four band-pass filters according to claim 1, is characterized in that, described dual-mode resonator is in parallel and realize by a closed stub and open stub.
3. microwave four band-pass filters according to claim 1, is characterized in that, described Double-frequency band elimination unit is realized by two different open stub parallel connections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410167042.4A CN103956545A (en) | 2014-04-23 | 2014-04-23 | Microwave four-frequency band pass filter |
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| CN201410167042.4A CN103956545A (en) | 2014-04-23 | 2014-04-23 | Microwave four-frequency band pass filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286055A (en) * | 2018-10-25 | 2019-01-29 | 成都会讯科技有限公司 | A kind of symmetric double detail parallel resonator and bandpass filter and design method |
| CN109301425A (en) * | 2018-10-25 | 2019-02-01 | 电子科技大学 | Three conductor parallel synthesis resonators of one kind and double frequency filter and design method |
| TWI767338B (en) * | 2020-02-10 | 2022-06-11 | 日商愛德萬測試股份有限公司 | Electrical filter structure |
| CN115513621A (en) * | 2022-09-23 | 2022-12-23 | 中国科学院物理研究所 | Microstrip graphic layer, preparation method thereof and low-pass band-pass filter thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012025946A1 (en) * | 2010-08-25 | 2012-03-01 | Commscope Italy S.R.L. | Tunable bandpass filter |
| CN102544653A (en) * | 2012-02-24 | 2012-07-04 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN203895576U (en) * | 2014-04-23 | 2014-10-22 | 南京航空航天大学 | Microwave four-frequency band-pass filter |
-
2014
- 2014-04-23 CN CN201410167042.4A patent/CN103956545A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012025946A1 (en) * | 2010-08-25 | 2012-03-01 | Commscope Italy S.R.L. | Tunable bandpass filter |
| CN102544653A (en) * | 2012-02-24 | 2012-07-04 | 南京航空航天大学 | Microwave four-frequency band pass filter |
| CN203895576U (en) * | 2014-04-23 | 2014-10-22 | 南京航空航天大学 | Microwave four-frequency band-pass filter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286055A (en) * | 2018-10-25 | 2019-01-29 | 成都会讯科技有限公司 | A kind of symmetric double detail parallel resonator and bandpass filter and design method |
| CN109301425A (en) * | 2018-10-25 | 2019-02-01 | 电子科技大学 | Three conductor parallel synthesis resonators of one kind and double frequency filter and design method |
| TWI767338B (en) * | 2020-02-10 | 2022-06-11 | 日商愛德萬測試股份有限公司 | Electrical filter structure |
| CN115513621A (en) * | 2022-09-23 | 2022-12-23 | 中国科学院物理研究所 | Microstrip graphic layer, preparation method thereof and low-pass band-pass filter thereof |
| CN115513621B (en) * | 2022-09-23 | 2023-12-15 | 中国科学院物理研究所 | Microstrip pattern layer, preparation method thereof and low pass band pass filter thereof |
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Application publication date: 20140730 |