CN207587939U - A kind of four passband microstrip filters - Google Patents
A kind of four passband microstrip filters Download PDFInfo
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- CN207587939U CN207587939U CN201721724504.3U CN201721724504U CN207587939U CN 207587939 U CN207587939 U CN 207587939U CN 201721724504 U CN201721724504 U CN 201721724504U CN 207587939 U CN207587939 U CN 207587939U
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- medium substrate
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- feed structure
- minor matters
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Abstract
The utility model discloses a kind of four passband microstrip filters, including medium substrate, the etched circuit layer for being formed in medium substrate side and the ground metal layer for being formed in medium substrate two sides；The etched circuit layer includes two resonant rings, and described two resonant rings are symmetrical arranged, minor matters resonator is equipped on the symmetry axis of two resonant rings, feed structure is also equipped on the resonant ring；The utility model has the following advantages：Using split ring resonator resonator, greatly reduce structure size；Symmetrical structure is employed, is suitble to carry out circuit equivalent analysis with analysis method of odd-even model, four passbands are adjustable；Asymmetric feed structure is employed, two additional transmission zeros are produced outside passband；The filter construction is simple, easy processing.Since this structure is the direct etch structures shaping filter of metal layer in medium substrate, high precision machining is simple and practicable, is conducive to integrate.
Description
Technical field
The utility model belongs to filter field, specifically a kind of four passbands microstrip filter.
Background technology
Since twentieth century end, there are two directions for the development of communication system, on the one hand, the frequency of mobile communication and wireless communication
Section is more and more wider, and more and more communication systems are operated in multiple frequency ranges, such as WLAN (Wireless
LocalArea Networks, WLAN) system two frequency ranges be 2.45GHz and 5.2GHz；Global system for mobile telecommunications (Global
System for Mobile Communications, GSM) system two frequency bands be 0.90GHz and 1.80GHz；The opposing party
Face, the performance of mobile communication equipment, weight, portability and reliability requirements are growing day by day, need multiple systems or
Multiple functions are concentrated in an equipment or terminal.This promotes the microwave device with multiband characteristic to a certain extent
Research.
In recent years, much at home and abroad scholar using step electric impedance resonator (Stepped Impedance Resonator,
SIR), detail loads many height of some new structure designs such as resonator (Stub-Loaded Resonator, SLR) structure
The comb filter of performance.Increasingly mature with technology, the application of band filter in a wireless communication system will be more next
It is more extensive, therefore study the new way of realization of the single, double pass filter of miniaturisation high-performance microstrip and method and just seem especially have
Meaning.To solve drawbacks described above, a solution is now provided.
Utility model content
The purpose of this utility model is to provide a kind of four passband microstrip filters.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of four passband microstrip filters including medium substrate, are formed in the etched circuit layer and shape of medium substrate side
Into in the ground plane of medium substrate opposite side；
Wherein, the etched circuit layer includes two resonant rings, and described two resonant rings are symmetrical arranged, two resonance
Minor matters resonator is equipped on the symmetry axis of ring, feed structure is also equipped on the resonant ring.
Further, the medium substrate uses Rogers 4350, dielectric constant 3.48, thickness 0.508mm.
Further, the resonant ring is split ring resonator；The minor matters resonator is open circuit minor matters resonator；It is described to open
The width of road minor matters resonator is twice of split ring resonator width.
Further, the feed structure is 0 ° of feed structure, and the feed structure is asymmetric feed structure.
Further, the ground plane is the copper overlayed on medium substrate.
The beneficial effects of the utility model：The utility model has the following advantages：1st, using split ring resonator resonator, make
Structure size greatly reduces.
2nd, symmetrical structure is employed, is suitble to carry out circuit equivalent analysis with analysis method of odd-even model, four passbands are equal
It is adjustable.
3rd, asymmetric feed structure is employed, two additional transmission zeros are produced outside passband.
4th, the filter construction is simple, easy processing.Since this structure is the direct etch structures of metal layer in medium substrate
Shaping filter, high precision machining is simple and practicable, is conducive to integrate.
Description of the drawings
In order to facilitate the understanding of those skilled in the art, the utility model will be further described below with reference to the accompanying drawings.
Fig. 1 is the structure diagram of the four passbands microstrip filter；
Fig. 2 is the split-ring resonator structure diagram of minor matters loading；
Fig. 3 is the split-ring resonator equivalent structure schematic diagram of minor matters loading；
Fig. 4 is the S parameter curve graph of the four passbands microstrip filter.
Specific embodiment
As shown in Figs 1-4, a kind of four passband microstrip filters, including medium substrate 1 and are formed in 1 side of medium substrate
Etched circuit layer 2, be also formed in the ground plane of 1 opposite side of medium substrate, the ground plane is to overlay on medium substrate
Copper；
Wherein, the etched circuit layer 2 includes two resonant rings 201, and described two resonant rings 201 are symmetrical arranged, two
Minor matters resonator 202 is equipped on the symmetry axis of the resonant ring 201, feed structure is also equipped on the resonant ring 201
203。
Further, the medium substrate 1 uses Rogers 4350, specifically using Rogers 4350 (B), dielectric constant
It is 3.48, thickness 0.508mm.
Further, the resonant ring 201 is split ring resonator；The minor matters resonator 202 is open circuit minor matters resonator；
The width of the open circuit minor matters resonator is twice of split ring resonator width.
Further, the feed structure 203 is 0 ° of feed structure, and the feed structure 203 is asymmetric feed structure,
Two additional transmission zeros can be generated outside passband.
Four passband microstrip filter of one kind as shown in Figure 1, including symmetrical split ring resonator there are two tools, each
Minor matters resonator is loaded on split ring resonator on respective symmetry axis；And with two transmission zeros of outer realization increase
0 ° of feed structure；
Fig. 2 is the split-ring resonator structure diagram of minor matters loading；
Fig. 3 is the split-ring resonator equivalent structure schematic diagram of minor matters loading；It, can be by parity mode due to the symmetry of structure
Analysis method explains, resonant frequency can have formula acquire：
Fig. 4 is a kind of S curve schematic diagram of four passbands microstrip filter of this patent embodiment；As seen from the figure, it filters
First passband of wave device is 1.55-1.62GHz, and second passband is 1.78-1.85GHz, and third passband is 2.42-
2.59GHz, the 4th passband are 2.63-2.70GHz.The insertion of four passbands, loss be respectively 0.7dB, 0.6dB, 0.7dB with
And 0.9dB, return loss are less than 20dB entirely.
Three transmission zeros are located at 1.35GHz, 2.1GHz and 2.9GHz respectively, and the position of transmission zero can be under
Formula acquires：
Wherein LTZ1=2L1-LTZ2, LTZ2=d1+L6+L5And LTZ3=L1-LTZ2+L3。
The utility model has the following advantages：1st, using split ring resonator resonator, greatly reduce structure size.
2nd, symmetrical structure is employed, is suitble to carry out circuit equivalent analysis with analysis method of odd-even model, four passbands are equal
It is adjustable.
3rd, asymmetric feed structure is employed, two additional transmission zeros are produced outside passband.
4th, the filter construction is simple, easy processing.Since this structure is the direct etch structures of metal layer in medium substrate
Shaping filter, high precision machining is simple and practicable, is conducive to integrate.
Above content is only to the utility model structure example and explanation, the technology people of affiliated the art
Member does various modifications or additions to described specific embodiment or substitutes in a similar way, without departing from reality
With novel structure or surmount range defined in the claims, all should belong to the protection range of the utility model.
Claims (5)
1. a kind of four passband microstrip filters, which is characterized in that including medium substrate (1), be formed in medium substrate (1) side
Etched circuit layer (2) and the ground plane for being formed in medium substrate (1) opposite side；
The etched circuit layer (2) includes two resonant rings (201), and described two resonant rings (201) are symmetrical arranged, described in two
Minor matters resonator (202) is equipped on the symmetry axis of resonant ring (201), feed structure is also equipped on the resonant ring (201)
(203)。
2. a kind of four passbands microstrip filter according to claim 1, which is characterized in that the medium substrate (1) uses
Rogers 4350, dielectric constant 3.48, thickness 0.508mm.
3. a kind of four passbands microstrip filter according to claim 1, which is characterized in that the resonant ring (201) is opens
Mouth resonant ring；The minor matters resonator (202) is open circuit minor matters resonator；The width of the open circuit minor matters resonator is humorous to be open
It shakes twice of ring width.
4. a kind of four passbands microstrip filter according to claim 1, which is characterized in that the feed structure (203) is
0 ° of feed structure, the feed structure (203) are asymmetric feed structure.
5. a kind of four passbands microstrip filter according to claim 1, which is characterized in that the ground plane is overlays on medium
Copper on substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721724504.3U CN207587939U (en) | 2017-12-12 | 2017-12-12 | A kind of four passband microstrip filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721724504.3U CN207587939U (en) | 2017-12-12 | 2017-12-12 | A kind of four passband microstrip filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207587939U true CN207587939U (en) | 2018-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721724504.3U Active CN207587939U (en) | 2017-12-12 | 2017-12-12 | A kind of four passband microstrip filters |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742496A (en) * | 2019-01-08 | 2019-05-10 | 西安电子科技大学 | Broadband bandpass filter based on nested annular and slot line resonator |
| CN110994094A (en) * | 2019-12-03 | 2020-04-10 | 上海海事大学 | Differential three-passband filter for loading UIR based on T-branch node |
| CN113471648A (en) * | 2021-09-03 | 2021-10-01 | 国网江苏省电力有限公司信息通信分公司 | Four-mode branch knot loading resonator and dual-passband band-pass filter based on same |
| CN114915276A (en) * | 2022-05-11 | 2022-08-16 | 西南交通大学 | Amplitude limiting filtering structure for radio frequency front end electromagnetic protection |
-
2017
- 2017-12-12 CN CN201721724504.3U patent/CN207587939U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742496A (en) * | 2019-01-08 | 2019-05-10 | 西安电子科技大学 | Broadband bandpass filter based on nested annular and slot line resonator |
| CN109742496B (en) * | 2019-01-08 | 2020-06-30 | 西安电子科技大学 | Broadband differential band-pass filter based on nested ring and slot line resonators |
| CN110994094A (en) * | 2019-12-03 | 2020-04-10 | 上海海事大学 | Differential three-passband filter for loading UIR based on T-branch node |
| CN113471648A (en) * | 2021-09-03 | 2021-10-01 | 国网江苏省电力有限公司信息通信分公司 | Four-mode branch knot loading resonator and dual-passband band-pass filter based on same |
| CN114915276A (en) * | 2022-05-11 | 2022-08-16 | 西南交通大学 | Amplitude limiting filtering structure for radio frequency front end electromagnetic protection |
| CN114915276B (en) * | 2022-05-11 | 2023-11-10 | 西南交通大学 | Amplitude limiting filter structure for electromagnetic protection of radio frequency front end |
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