CN112310584A - Ring filter - Google Patents
Ring filter Download PDFInfo
- Publication number
- CN112310584A CN112310584A CN202011198135.5A CN202011198135A CN112310584A CN 112310584 A CN112310584 A CN 112310584A CN 202011198135 A CN202011198135 A CN 202011198135A CN 112310584 A CN112310584 A CN 112310584A
- Authority
- CN
- China
- Prior art keywords
- transmission line
- branch
- short
- circuit
- filter
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to the technical field of filters, in particular to a ring filter, which comprises a first transmission line, a second transmission line, a third transmission line, a fourth transmission line and a fifth transmission line; an input port is formed at one end of the first transmission line; the other end of the fifth transmission line is provided with an output port; a short-circuit branch knot is arranged between one end of the second transmission line and the other end of the fourth transmission line; the other end of the second transmission line extends outwards to form a first branch section; and one end of the fourth transmission line extends outwards to form a second branch. The short-circuit branch, the first branch and the second branch can increase the out-of-band rejection capability of the filter, and the second transmission line, the third transmission line, the fourth transmission line and the short-circuit branch form an annular structure, so that the filter can expand the bandwidth of a path, increase the out-of-band rejection capability and reduce the loss.
Description
Technical Field
The invention relates to the technical field of filters, in particular to a ring filter.
Background
In recent years, research on filters has been advanced, and a filter that is miniaturized, has good performance, is low-cost, and is easy to mount and use has been the focus in wireless terminal communication. With the development of multi-band and multi-standard wireless communication technology, adjacent frequency bands have little interference in frequency selection, so that a useful signal needs to pass through, and an interference signal needs to be suppressed to improve the performance of the system. Therefore, it is necessary to provide a filter with superior out-of-band rejection performance.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages of the prior art and providing a loop filter.
The purpose of the invention is realized by the following technical scheme: a loop filter comprises a first transmission line, a second transmission line, a third transmission line, a fourth transmission line and a fifth transmission line; an input port is formed at one end of the first transmission line; the other end of the first transmission line is connected with one end of the second transmission line; the other end of the second transmission line is connected with one end of a third transmission line; the other end of the third transmission line is connected with one end of a fourth transmission line; the other end of the fourth transmission line is connected with one end of a fifth transmission line; the other end of the fifth transmission line is provided with an output port;
a short-circuit branch knot is arranged between one end of the second transmission line and the other end of the fourth transmission line; the other end of the second transmission line extends outwards to form a first branch section; and one end of the fourth transmission line extends outwards to form a second branch.
The invention is further arranged that the first transmission line and the fifth transmission line are arranged in parallel; the first branch knot and the second branch knot are arranged in parallel.
The invention is further arranged that the second transmission line is arranged in parallel with the fourth transmission line; the third transmission line is arranged in parallel with the short-circuit branch section; the short circuit branch is perpendicular to the second transmission line.
The invention is further arranged that the first transmission line, the second transmission line and the first branch are arranged on the same straight line.
The invention is further configured that the fourth transmission line, the fifth transmission line and the second branch are arranged on the same straight line.
The invention is further arranged that the first branch is a first ground short circuit node; the second branch node is a second grounding short-circuit node; the first grounding short-circuit joint and the second grounding short-circuit joint are respectively grounded.
The invention is further arranged that the second transmission line, the third transmission line, the fourth transmission line and the short-circuit branch are formed into a square shape.
The invention is further arranged that the first branch is a first open-circuit branch; the second branch is a second open-circuit branch.
The invention is further arranged that the second transmission line, the third transmission line, the fourth transmission line and the short-circuit branch are formed into a square shape.
The invention has the beneficial effects that: the short-circuit branch, the first branch and the second branch can increase the out-of-band rejection capability of the filter, and the second transmission line, the third transmission line, the fourth transmission line and the short-circuit branch form an annular structure, so that the filter can expand the bandwidth of a path, increase the out-of-band rejection capability and reduce the loss.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic structural view of example 2;
FIG. 3 is a schematic structural view of embodiment 3;
FIG. 4 is a schematic structural view of example 4;
wherein: 1. a first transmission line; 2. a second transmission line; 3. a third transmission line; 4. a fourth transmission line; 5. a fifth transmission line; 61. an input port; 62. an output port; 7. short circuit branch knots; 81. a first open circuit limb; 82. a second open circuit branch; 91. a first ground short circuit segment; 92. and a second ground short circuit node.
Detailed Description
The invention is further described with reference to the following examples.
In embodiment 1, as shown in fig. 1, the loop filter in this embodiment includes a first transmission line 1, a second transmission line 2, a third transmission line 3, a fourth transmission line 4, and a fifth transmission line 5; an input port 61 is arranged at one end of the first transmission line 1; the other end of the first transmission line 1 is connected with one end of a second transmission line 2; the other end of the second transmission line 2 is connected with one end of a third transmission line 3; the other end of the third transmission line 3 is connected with one end of a fourth transmission line 4; the other end of the fourth transmission line 4 is connected with one end of a fifth transmission line 5; the other end of the fifth transmission line 5 is provided with an output port 62;
a short-circuit branch 7 is arranged between one end of the second transmission line 2 and the other end of the fourth transmission line 4; the other end of the second transmission line 2 extends outwards to form a first branch section; one end of the fourth transmission line 4 extends outwards to form a second branch.
Specifically, this embodiment can increase the out-of-band rejection capability of the filter by providing the short-circuit branch 7, the first branch and the second branch, and in addition, the second transmission line 2, the third transmission line 3, the fourth transmission line 4 and the short-circuit branch 7 form an annular structure, so that the filter can expand the bandwidth of the path and increase the out-of-band rejection capability, and the loss is reduced.
In the annular filter of this embodiment, the first transmission line 1 and the fifth transmission line 5 are arranged in parallel; the first branch knot and the second branch knot are arranged in parallel. Through the arrangement, the filter is compact in structure, the size is reduced, and the two branches are concise.
In the loop filter of this embodiment, the second transmission line 2 and the fourth transmission line 4 are arranged in parallel; the third transmission line 3 is arranged in parallel with the short circuit branch 7; the short-circuit branch 7 is arranged perpendicular to the second transmission line 2. The filter can be made compact by the above arrangement, thereby reducing the size.
In the ring filter of this embodiment, the first transmission line 1, the second transmission line 2 and the first branch are disposed on the same straight line. The filter can be made compact by the above arrangement, thereby reducing the size.
In the ring filter of this embodiment, the fourth transmission line 4, the fifth transmission line 5 and the second branch are disposed on the same straight line. The filter can be made compact by the above arrangement, thereby reducing the size.
In the annular filter of this embodiment, the first branch is a first ground short-circuit joint 91; the second branch is a second grounding short-circuit section 92; the first ground short-circuit joint 91 and the second ground short-circuit joint 92 are grounded, respectively. The filter expands the access bandwidth, increases the out-of-band rejection capability and reduces the loss through the arrangement.
Embodiment 2, as shown in fig. 2, is different from embodiment 1 in that in the loop filter of this embodiment, the second transmission line 2, the third transmission line 3, the fourth transmission line 4, and the short-circuit branch 7 form a square shape therebetween. The filter can further expand the path bandwidth, increase the out-of-band rejection capability and reduce the loss through the arrangement.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A loop filter, comprising: comprises a first transmission line (1), a second transmission line (2), a third transmission line (3), a fourth transmission line (4) and a fifth transmission line (5); an input port (61) is formed at one end of the first transmission line (1); the other end of the first transmission line (1) is connected with one end of the second transmission line (2); the other end of the second transmission line (2) is connected with one end of a third transmission line (3); the other end of the third transmission line (3) is connected with one end of a fourth transmission line (4); the other end of the fourth transmission line (4) is connected with one end of a fifth transmission line (5); the other end of the fifth transmission line (5) is provided with an output port (62);
a short-circuit branch (7) is arranged between one end of the second transmission line (2) and the other end of the fourth transmission line (4); the other end of the second transmission line (2) extends outwards to form a first branch section; one end of the fourth transmission line (4) extends outwards to form a second branch.
2. The loop filter of claim 1, wherein: the first transmission line (1) and the fifth transmission line (5) are arranged in parallel; the first branch knot and the second branch knot are arranged in parallel.
3. The loop filter of claim 1, wherein: the second transmission line (2) and the fourth transmission line (4) are arranged in parallel; the third transmission line (3) is arranged in parallel with the short-circuit branch (7); the short circuit branch (7) is perpendicular to the second transmission line (2).
4. The loop filter of claim 1, wherein: the first transmission line (1), the second transmission line (2) and the first branch section are arranged on the same straight line.
5. The loop filter of claim 1, wherein: the fourth transmission line (4), the fifth transmission line (5) and the second branch section are arranged on the same straight line.
6. The loop filter of claim 1, wherein: the first branch is a first grounding short-circuit joint (91); the second branch is a second grounding short-circuit joint (92); the first grounding short-circuit joint (91) and the second grounding short-circuit joint (92) are grounded respectively.
7. The loop filter of claim 6, wherein: and a square shape is formed among the second transmission line (2), the third transmission line (3), the fourth transmission line (4) and the short circuit branch (7).
8. The loop filter of claim 1, wherein: the first branch is a first open-circuit branch (81); the second branch is a second open-circuit branch (82).
9. The loop filter of claim 8, wherein: and a square shape is formed among the second transmission line (2), the third transmission line (3), the fourth transmission line (4) and the short circuit branch (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011198135.5A CN112310584B (en) | 2020-10-30 | 2020-10-30 | Ring filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011198135.5A CN112310584B (en) | 2020-10-30 | 2020-10-30 | Ring filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112310584A true CN112310584A (en) | 2021-02-02 |
| CN112310584B CN112310584B (en) | 2021-11-05 |
Family
ID=74334120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011198135.5A Active CN112310584B (en) | 2020-10-30 | 2020-10-30 | Ring filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112310584B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324615A (en) * | 2011-07-14 | 2012-01-18 | 韩煦 | Microwave millimeter wave planar broadband high-power micro-strip power synthesizer |
| CN104733827A (en) * | 2015-04-14 | 2015-06-24 | 南京邮电大学 | High isolation microstrip branch line orientate coupler with short circuit section |
| US20160126606A1 (en) * | 2014-11-05 | 2016-05-05 | Associated Universities, Inc. | Transmission Line Reflectionless Filters |
| CN106876842A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | Double trap bandpass filters of the single open circuit minor matters of toroidal cavity resonator loading |
| CN106876843A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | Double trap bandpass filters of the double open circuit minor matters of toroidal cavity resonator loading |
| CN110556615A (en) * | 2019-09-07 | 2019-12-10 | 西南交通大学 | multi-frequency band-pass filter based on coupling symmetrical short-circuit branch multimode resonator |
-
2020
- 2020-10-30 CN CN202011198135.5A patent/CN112310584B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324615A (en) * | 2011-07-14 | 2012-01-18 | 韩煦 | Microwave millimeter wave planar broadband high-power micro-strip power synthesizer |
| US20160126606A1 (en) * | 2014-11-05 | 2016-05-05 | Associated Universities, Inc. | Transmission Line Reflectionless Filters |
| CN104733827A (en) * | 2015-04-14 | 2015-06-24 | 南京邮电大学 | High isolation microstrip branch line orientate coupler with short circuit section |
| CN106876842A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | Double trap bandpass filters of the single open circuit minor matters of toroidal cavity resonator loading |
| CN106876843A (en) * | 2015-12-13 | 2017-06-20 | 哈尔滨飞羽科技有限公司 | Double trap bandpass filters of the double open circuit minor matters of toroidal cavity resonator loading |
| CN110556615A (en) * | 2019-09-07 | 2019-12-10 | 西南交通大学 | multi-frequency band-pass filter based on coupling symmetrical short-circuit branch multimode resonator |
Non-Patent Citations (1)
| Title |
|---|
| 张风雨: "小型平面带通滤波器的研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112310584B (en) | 2021-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020125665A1 (en) | Multi-stopband filter and implementation method therefor | |
| CN109831176A (en) | A kind of piezoelectric acoustic-wave filter and duplexer | |
| CN205017319U (en) | Radio frequency front end antenna multiplex circuit based on different frequency channels | |
| US11601115B2 (en) | Electronic RF filter | |
| CN113411063B (en) | Harmonic suppression matching circuit structure and power amplifier suitable for balun | |
| CN112615602B (en) | Circuit structure of FBAR filter | |
| US10211879B2 (en) | Front-end module | |
| CN213782232U (en) | Annular combiner | |
| CN109088134B (en) | Microstrip band-pass filter | |
| CN112310584B (en) | Ring filter | |
| CN213782231U (en) | Ring filter | |
| KR20010007197A (en) | Frequency-characteristics variable filter, duplexer, and communication apparatus | |
| CN218648814U (en) | Dual-frenquency 5G radio frequency front end module | |
| CN103337679A (en) | Three-passband high-temperature superconductor (HTS) filter based on T-shaped branch loading stepped impedance resonator | |
| CN215912076U (en) | Harmonic suppression matching circuit structure and power amplifier suitable for balun | |
| CN215912080U (en) | Harmonic suppression matching circuit structure and power amplifier suitable for balun | |
| CN112688660B (en) | FBAR filter circuit | |
| CN211125984U (en) | Filter and communication equipment | |
| CN213425202U (en) | Antenna and wearing equipment | |
| CN112671362A (en) | FBAR filter | |
| CN109104164A (en) | A kind of IPD filter and its strengthen filtering framework | |
| CN209993710U (en) | Multi-channel lumped parameter combiner | |
| CN216531252U (en) | Radio frequency circuit and power amplifier circuit | |
| JPS63267001A (en) | Polar filter | |
| CN109473782B (en) | Antenna and method for realizing multi-output-port common antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |