CN101719576A - Embedded microwave bandpass filter - Google Patents
Embedded microwave bandpass filter Download PDFInfo
- Publication number
- CN101719576A CN101719576A CN200910186608A CN200910186608A CN101719576A CN 101719576 A CN101719576 A CN 101719576A CN 200910186608 A CN200910186608 A CN 200910186608A CN 200910186608 A CN200910186608 A CN 200910186608A CN 101719576 A CN101719576 A CN 101719576A
- Authority
- CN
- China
- Prior art keywords
- resonator
- filter
- resonators
- square
- loop
- 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
Links
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a novel microwave bandpass filter which consists of two square open-loop resonators (1)(3) and a U-shaped resonator (2), wherein the three resonators have the same resonance frequency; a transmission zero is generated on an upper stop band of the filter by cross coupling between the two square open-loop resonators so as to enhance the suppression to out-of-band signals of the filter and improve the performance of the filter; the three resonators have the same perimeter; and the length of a middle guide band of the U-shaped resonator is more than two times of that of the square open-loop resonator. Compared with the prior art, the embedded microwave bandpass filter can reduce the volume of the filter by more than 1/3; and because the transmission zero is generated on the stop band by the cross coupling, the attenuation can reach -60dB. The embedded microwave bandpass filter is suitable for microwave filter transmission.
Description
Technical field
The present invention relates to a kind of cross-linked embedded microwave bandpass filter that has, belong to microwave filtering device technical field.
Background technology
Microwave filter is the Primary Component of radio communication front end, and radio communication need adopt volume little, the microwave filter that performance is high.For the microwave filter of realizing that volume is little, can adopt dual mode filter, slow wave structure filter etc.Also having a kind of effective method is rationally to arrange and distribute position between resonator, as adopting sandwich construction or making the embedded arrangement of resonator.Improve filter characteristic, method commonly used is the progression that increases filter.Though increase the sideband characteristic that filter order can be improved filter, make the stopband of filter become more precipitous.But when characteristic was improved, the volume of filter increased on the one hand, and the loss of filter also increases on the other hand.Do not increase the progression of filter when improving for the characteristic that makes filter again, the method that can adopt is to introduce cross-couplings between the non-conterminous resonator of filter, in the stopband edge generation transmission zero of filter.This method can effectively improve the characteristic of filter under the prerequisite that does not increase filter order.Notification number CN201222527 discloses a kind of little band groove cross-couplings ring microwave band-pass filter, this microwave band-pass filter is made up of filter cavity and internal chiasma coupled structure, be provided with the cross coupling structure that is used to realize bandpass filtering in the filter cavity, this cross coupling structure is made up of at least four resonant rings, and the two ends of cross coupling structure are connected with coaxial probe by microstrip line respectively.
Summary of the invention
The objective of the invention is, in order to obtain little, the function admirable of a kind of volume, and the microwave filter that adopts comparatively simple method to realize.
Technical scheme of the present invention is, microwave filter of the present invention is made up of two little band square open-loop resonators and little band U-shaped resonator, and three resonators have identical resonance frequency.Because two square open-loop resonators are embedded into being placed in the U-shaped resonator of formula, have reduced the volume of filter.Distance between the square annular resonance device can change, and the coupling between them forms cross-couplings, and stopband produces a transmission zero on filter, has improved the stopband characteristic of filter.
Microwave band-pass filter of the present invention is made up of two square open-loop resonators and a U-shaped resonator, and two square open-loop resonators are embedded in the U resonator, constitutes three grades of band pass filters, and three resonators have identical resonance frequency.
Microwave band-pass filter of the present invention as shown in Figure 3.Signal is coupled to resonator (1) by input port (4) input by the tap form, and U-shaped resonator (2) is coupled to by resonator (1) in the back, and then is coupled to square resonator (3) by U-shaped resonator (2), is exported by output port (5) by tap at last.Because three resonators have identical resonance frequency, so signal can well arrive output from input by coupling.Simultaneously, owing to have cross-couplings between resonator (1) resonator (3), this cross-couplings can stopband edge produce a transmission zero on filter, improved the filter stop bend characteristic.Coupling between resonator (1) resonator (2) can control by the lateral separation (7) and the fore-and-aft distance (6) that change between resonator, thus the bandwidth of control filters.Distance (8) between two square resonators can be used for controlling cross-linked size, so that change the position of transmission zero.Regulate the external sort factor that tap position (9) can change input and output, make it to reach designing requirement.U-shaped resonator (2) is identical with square open-loop resonator (1 or 3) girth, the resonance frequency of its girth decision resonator, the length of the middle conduction band of U-shaped resonator should be more than the twice of the length of side of square resonator, so that two square resonators can be embedded in the U-shaped resonator simultaneously.The filter of this damascene structures is compared with the conventional arrangement mode, and the volume that can reduce filter reaches more than 1/3; Because cross-couplings, in the transmission zero that stopband produces, its decay can reach-60dB.
The present invention is applicable to microwave transmission filtering.
Description of drawings
Fig. 1 is the structure chart of square open-loop resonator;
Fig. 2 is the structure chart of U-shaped resonator;
Fig. 3 is the structure chart of microwave filter;
Among the figure: (1) and (3) is square open-loop resonator, and (2) are the U-shaped resonators, and (4) and (5) are respectively that characteristic impedance is 50 ohm input port and an output port; (6) and (7) be respectively fore-and-aft distance and lateral separation between square resonator and U-shaped resonator, (8) are two distances between the square annular resonance device, (9) are the input and output port tap position.
Embodiment
The microwave band-pass filter of present embodiment as shown in Figure 3, this microwave band-pass filter is made up of two square open-loop resonators and a U resonator.Two square open-loop resonators (1), (3) are embedded in the U resonator (2), constitute three grades of band pass filters.Signal is imported by input port (4), be coupled to square resonator (1) by the tap form, U-shaped resonator (2) is coupled to by square resonator (1) in the back, and then is coupled to square resonator (3) by U-shaped resonator (2), is exported by port (5) by tap at last.Because three resonators have identical resonance frequency, so signal can well arrive output from input by coupling.Simultaneously, owing to have cross-couplings between square resonator (1) and the square resonator (3), this cross-couplings can stopband edge produce a transmission zero on filter, improved the filter stop bend characteristic.Coupling between square resonator (1) and the U-shaped resonator (2) can control by the lateral separation (7) and the fore-and-aft distance (6) that change between resonator, thus the bandwidth of control filters.(6) and the representative value of (7) be respectively 0.55mm and 0.4mm, the representative value of corresponding bandwidth is 7.4%; Distance (8) between two square resonators can be used for controlling cross-linked size, so that change the position of transmission zero.Conciliation tap position (9) can change the external sort factor of input and output, makes it to reach designing requirement.(8) and the representative value of (9) be 1.7mm and 3.1mm.U-shaped resonator (2) is identical with square open-loop resonator (1 or 3) girth, the resonance frequency of its girth decision resonator, the length of the middle conduction band of U-shaped resonator should be more than the twice of the length of side of square resonator, so that two square resonators can be embedded in the U-shaped resonator simultaneously.The filter of this damascene structures is compared with the conventional arrangement mode, and the volume that can reduce filter reaches more than 1/3; Because cross-couplings, in the transmission zero that stopband produces, its decay can reach-60dB.
Claims (4)
1. novel microwave band pass filter, it is characterized in that: described filter is made up of two square open-loop resonators (1), (3) and a U-shaped resonator (2), two square open-loop resonators are embedded in the U-shaped resonator, constitute three grades of band pass filters, three resonators have identical resonance frequency.
2. microwave filter according to claim 1 is characterized in that, described U-shaped resonator is identical with the square open-loop resonator girth, and the length of the middle conduction band of U-shaped resonator should be more than the twice of the length of side of square resonator.
3. a kind of microwave band-pass filter according to claim 1 is characterized in that, the stopband on filter of the cross-couplings between two square open-loop resonators produces a transmission zero.
4. a kind of microwave band-pass filter according to claim 1, it is characterized in that, coupling between described square open-loop resonator resonator (1) and the U-shaped resonator (2) can control by the lateral separation (7) and the fore-and-aft distance (6) that change between resonator, thus the bandwidth of control filters; Distance (8) between two square resonators can be used for controlling cross-linked size, so that change the position of transmission zero; Regulate the external sort factor that tap position (9) can change input and output, make it to reach designing requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910186608A CN101719576A (en) | 2009-12-02 | 2009-12-02 | Embedded microwave bandpass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910186608A CN101719576A (en) | 2009-12-02 | 2009-12-02 | Embedded microwave bandpass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101719576A true CN101719576A (en) | 2010-06-02 |
Family
ID=42434112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910186608A Pending CN101719576A (en) | 2009-12-02 | 2009-12-02 | Embedded microwave bandpass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101719576A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916891A (en) * | 2010-08-12 | 2010-12-15 | 华东交通大学 | Ultra-wideband band-pass filter with band stop characteristic |
| CN102437400A (en) * | 2011-08-26 | 2012-05-02 | 上海交通大学 | Four-order cross-coupling band pass filter |
| CN102868012A (en) * | 2012-09-07 | 2013-01-09 | 航天恒星科技有限公司 | High-temperature superconductive micro-strip resonator and filter containing same |
| CN106229590A (en) * | 2016-08-24 | 2016-12-14 | 华东交通大学 | A kind of ultra wide band bandpass filter with trap characteristic |
| CN109860963A (en) * | 2019-04-01 | 2019-06-07 | 哈尔滨工业大学 | Phase shifter is filtered based on the liquid crystal of pectination microstrip line and hairpin resonator array |
| CN110034364A (en) * | 2019-04-30 | 2019-07-19 | 天津大学 | A kind of ceramic base cross-coupling hair clip mode filter of ultralow insertion loss |
| CN111293413A (en) * | 2020-03-03 | 2020-06-16 | 电子科技大学 | Compact broadband filtering antenna based on cross-coupling structure and MIMO antenna thereof |
-
2009
- 2009-12-02 CN CN200910186608A patent/CN101719576A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916891A (en) * | 2010-08-12 | 2010-12-15 | 华东交通大学 | Ultra-wideband band-pass filter with band stop characteristic |
| CN101916891B (en) * | 2010-08-12 | 2013-02-06 | 华东交通大学 | Ultra-wideband band-pass filter with band stop characteristic |
| CN102437400A (en) * | 2011-08-26 | 2012-05-02 | 上海交通大学 | Four-order cross-coupling band pass filter |
| CN102437400B (en) * | 2011-08-26 | 2014-04-16 | 上海交通大学 | Four-order cross-coupling band pass filter |
| CN102868012A (en) * | 2012-09-07 | 2013-01-09 | 航天恒星科技有限公司 | High-temperature superconductive micro-strip resonator and filter containing same |
| CN102868012B (en) * | 2012-09-07 | 2015-02-11 | 航天恒星科技有限公司 | High-temperature superconductive micro-strip resonator and filter containing same |
| CN106229590A (en) * | 2016-08-24 | 2016-12-14 | 华东交通大学 | A kind of ultra wide band bandpass filter with trap characteristic |
| CN106229590B (en) * | 2016-08-24 | 2019-01-01 | 华东交通大学 | A kind of ultra wide band bandpass filter with trap characteristic |
| CN109860963A (en) * | 2019-04-01 | 2019-06-07 | 哈尔滨工业大学 | Phase shifter is filtered based on the liquid crystal of pectination microstrip line and hairpin resonator array |
| CN109860963B (en) * | 2019-04-01 | 2021-02-09 | 哈尔滨工业大学 | Liquid crystal filtering phase shifter based on comb-shaped microstrip line and hairpin resonator array |
| CN110034364A (en) * | 2019-04-30 | 2019-07-19 | 天津大学 | A kind of ceramic base cross-coupling hair clip mode filter of ultralow insertion loss |
| CN111293413A (en) * | 2020-03-03 | 2020-06-16 | 电子科技大学 | Compact broadband filtering antenna based on cross-coupling structure and MIMO antenna thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103700910B (en) | The two band filter of a kind of complementary openings resonant ring and defect ground structure half module substrate integrated wave guide | |
| CN101719576A (en) | Embedded microwave bandpass filter | |
| CN103730709B (en) | Based on the two band filter on substrate integration wave-guide composite left-and-right-hand and complementary openings resonant ring defect ground | |
| CN103367844B (en) | Multi-branch loading-based three passband high-temperature superconductive filter | |
| CN101662058A (en) | Source end coupling microstrip filter | |
| CN102509822B (en) | Double-band-pass microstrip filter | |
| CN103762404B (en) | Double-frequency-band filter | |
| CN102509823B (en) | Double-passband micro-strip filter | |
| CN101958442B (en) | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure | |
| CN201503900U (en) | Source-end coupling microstrip filter | |
| CN108292928A (en) | Multiple-harmonic matching network | |
| CN110808440A (en) | Dielectric waveguide duplexer | |
| JP2010538559A (en) | Multi-band transmission / reception coupler for OMT broadband for ultra-high frequency telecommunication antennas-separator | |
| CN101950826B (en) | Square annular defected ground structure microwave dual-mode band-pass filter | |
| CN204375890U (en) | Based on the ultra-broadband dual-frequency band pass filter of dual-mode resonator | |
| CN108879043A (en) | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure | |
| CN104282970B (en) | A kind of DBR filters and DBR duplexers | |
| CN208478527U (en) | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure | |
| CN111224209A (en) | Waveguide band-pass filter based on waveguide re-cut-off characteristic and design method thereof | |
| CN211830724U (en) | Band-pass filter circuit and multiplexer | |
| US8729980B2 (en) | Band-pass filter based on CRLH resonator and duplexer using the same | |
| CN104966860B (en) | A kind of assembly type orthomode transducer filter assembly | |
| KR101257599B1 (en) | Rf signal multiplexing device having window structure | |
| CN204696218U (en) | Bandwidth compact controlled UWB tri-band-pass filter | |
| CN204706614U (en) | Based on ultra broadband three band-pass filter of multimode resonator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100602 |