CN202678483U - A microstrip hairpin band-pass filter - Google Patents
A microstrip hairpin band-pass filter Download PDFInfo
- Publication number
- CN202678483U CN202678483U CN 201220218720 CN201220218720U CN202678483U CN 202678483 U CN202678483 U CN 202678483U CN 201220218720 CN201220218720 CN 201220218720 CN 201220218720 U CN201220218720 U CN 201220218720U CN 202678483 U CN202678483 U CN 202678483U
- Authority
- CN
- China
- Prior art keywords
- pass filter
- band
- hair fastener
- band pass
- fastener type
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a microstrip hairpin band-pass filter comprising a band-pass filter and four branch open-circuit lines connected with the band-pass filter in parallel. The open-circuit lines in parallel are equivalent to a band-stop filter and effectively stop high frequency of a stop band while having little influence on the pass band of the band-pass filter. Without any influence on insertion loss and input and output standing wave coefficients, the microstrip hairpin band-pass filter improves inhibition performance out of the pass band and has characteristics of small size, easy debugging, strong practicality, simplicity and easy implementation, and unchanged planar structure of a circuit. The microstrip hairpin band-pass filter can be widely applied to microwave circuit design.
Description
Technical field
The utility model relates to the filter in a kind of microwave hybrid integrated circuit, relates in particular to a kind of little band hair fastener type band pass filter, belongs to the electronics and communication technical field.
Background technology
Filter has the characteristic that frequency is selected, and unwanted frequency is suppressed, and the frequency that allowing needs is passed through.In fields such as communication, navigation, satellite communication and electronic countermeasuress, the filter device that is absolutely necessary.Divide by function, filter can be divided into that low pass, high pass, band are logical, four types of band resistance; Can be divided into lumped parameter filter, microstrip filter, crystal filter, Surface Acoustic Wave Filter etc. by employed components and parts.Microstrip filter is easy and other microwave circuit is integrated, realizes the miniaturization of microwave system, is widely used in engineering design.Compare with side coupling, the structure such as interdigitated, hair fastener type band pass filter volume is little, be convenient to debugging, is widely used in microwave circuits.But hair fastener type band pass filter has an obvious shortcoming, and the high-end rejection of frequency is relatively poor.
The utility model content
The purpose of this utility model provides a kind of little band hair fastener type band pass filter, in the situation that do not affect Insertion Loss and input and output standing-wave ratio, improves the Out-of-band rejection performance.
For realizing the purpose of this utility model, the technical scheme that adopts is as follows:
A kind of little band hair fastener type band pass filter is characterized in that, comprises band pass filter and four the detail open-circuit lines in parallel with it.
Described band pass filter is seven joint hair fastener type resonator couplings.
Described band pass filter comprises that seven bent-segments are U-shaped coupled microstrip line.
Described open-circuit line is the quarter-wave open-circuit line.
Described coupled microstrip line, open-circuit line are arranged on the metallic plate.
U-shaped knee at the coupled microstrip line of described hair fastener mode filter arranges corner cut.
The copper layer that can increase live width is pasted on U-shaped base at the coupled microstrip line of described hair fastener mode filter.
The length of the described open-circuit line of high-end set of frequency that suppresses according to need.
Quarter-wave open-circuit line in parallel is equivalent to band stop filter, but the quarter-wave open-circuit line of single detail only suppresses better a certain frequency.In order to expand frequency, behind band pass filter, add the quarter-wave open-circuit line of four details, the frequency that has effectively suppressed stopband is high-end, and is less to performance impact in the band of band pass filter.
The beneficial effect that the utility model reaches:
Of the present utility model little with hair fastener type band pass filter in the situation that do not affect Insertion Loss and input and output standing-wave ratio, improved the Out-of-band rejection performance; And volume is little, and debugging is convenient, and is practical, simple, does not change the planar structure of circuit, can be widely used in microwave circuits.
Description of drawings
Fig. 1 is the front of the PCB domain of Ku band filter of the present utility model.
Fig. 2 is the transformation parameter S12 test curve of the hair clip type band pass filter of Fig. 1;
Fig. 3 is the filter cutaway view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection range of the present utility model with this.
Fig. 1 is the front of the PCB domain of Ku band filter of the present utility model, and the back side is radio frequency ground connection.
Little band hair fastener type band pass filter of the present utility model comprises hair fastener mode filter and the quarter-wave open-circuit line of four joints, the hair fastener mode filter is made of seven joints, the open-circuit line process quarter-wave equivalence that consists of band stop filter is shorted to earth, and the quarter-wave open-circuit line of four details has effectively suppressed the high-end a certain frequency range of frequency.Circuit boards is Rogers 5880.Because sheet material is thinner, flexible distortion, whole circuit board soldering is guaranteed abundant ground connection on sizeable metallic plate, do not have air-gap in the middle of the circuit board, input and output connect sub-miniature A connector.
Fig. 2 is S21 curve of the present utility model, can find out that squareness factor is better, and Insertion Loss is 4.8dB, frequency be the inhibition at 15～16GHz place greater than 30dB, suppress approximately high 20dB than common hair fastener mode filter.
Such as Fig. 3, if will improve centre frequency, can corner cut 1 be set by the U-shaped knee at the coupled microstrip line of hair fastener mode filter, reduce the length of coupling line detail, can improve centre frequency.
If reduce centre frequency, can be on the U-shaped base 2 of the coupled microstrip line of hair fastener mode filter the copper-surfaced skin, increase live width, improve the length of coupling line detail, thereby reduce centre frequency.
Insertion Loss can change by the coupling amount that changes between hair fastener mode filter two joints in the band.
The high-end inhibition of frequency can be adjusted by the length that changes four open-circuit line details.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and distortion, these improvement and distortion also should be considered as protection range of the present utility model.
Claims (8)
1. a little band hair fastener type band pass filter is characterized in that, comprises band pass filter and four the detail open-circuit lines in parallel with it.
2. a kind of little band hair fastener type band pass filter according to claim 1 is characterized in that, described band pass filter is seven joint hair fastener type resonator couplings.
3. a kind of little band hair fastener type band pass filter according to claim 1 and 2 is characterized in that, described band pass filter comprises that seven bent-segments are U-shaped coupled microstrip line.
4. a kind of little band hair fastener type band pass filter according to claim 1 is characterized in that, described open-circuit line is the quarter-wave open-circuit line.
5. a kind of little band hair fastener type band pass filter according to claim 3 is characterized in that, described coupled microstrip line, open-circuit line are arranged on the metallic plate.
6. a kind of little band hair fastener type band pass filter according to claim 2 is characterized in that, in the U-shaped knee of the coupled microstrip line of described hair fastener mode filter corner cut is set.
7. a kind of little band hair fastener type band pass filter according to claim 2 is characterized in that, pastes the copper layer that can increase live width on the U-shaped base of the coupled microstrip line of described hair fastener mode filter.
8. a kind of little band hair fastener type band pass filter according to claim 1 is characterized in that, the length of the described open-circuit line of high-end set of frequency that suppresses according to need.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218720 CN202678483U (en) | 2012-05-16 | 2012-05-16 | A microstrip hairpin band-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218720 CN202678483U (en) | 2012-05-16 | 2012-05-16 | A microstrip hairpin band-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202678483U true CN202678483U (en) | 2013-01-16 |
Family
ID=47499363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220218720 Expired - Fee Related CN202678483U (en) | 2012-05-16 | 2012-05-16 | A microstrip hairpin band-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202678483U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466319A (en) * | 2014-12-15 | 2015-03-25 | 中国科学院微电子研究所 | Dual-mode filter with hairpin-like step impedance resonator loaded open-circuit lines |
| CN107331926A (en) * | 2017-07-06 | 2017-11-07 | 中国人民解放军国防科学技术大学 | Micro-strip double-passband filter |
-
2012
- 2012-05-16 CN CN 201220218720 patent/CN202678483U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466319A (en) * | 2014-12-15 | 2015-03-25 | 中国科学院微电子研究所 | Dual-mode filter with hairpin-like step impedance resonator loaded open-circuit lines |
| CN107331926A (en) * | 2017-07-06 | 2017-11-07 | 中国人民解放军国防科学技术大学 | Micro-strip double-passband filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112909461B (en) | Complementary duplex structure full-band absorption dual-frequency band-pass filter | |
| CN206864596U (en) | A kind of transition structure of millimeter wave differential microstrip to rectangular waveguide | |
| CN108321482A (en) | A kind of flexible broadband branch line coupler can inhibit triple-frequency harmonics | |
| CN103811832A (en) | Filter, receiver, transmitter and transceiver | |
| CN104659450B (en) | A kind of broadband bandpass filter based on cross resonator | |
| CN109713419A (en) | A kind of model filters power splitter with Wide stop bands and high-isolation | |
| WO2023019909A1 (en) | Harmonic suppression circuit, power amplifier module, communication device, and communication system | |
| CN202678483U (en) | A microstrip hairpin band-pass filter | |
| CN105958165B (en) | A kind of three frequency range of miniaturization high isolation, six tunnel micro-strip combiner | |
| CN100495814C (en) | Any dual-frequency band 3dB branch directional coupler | |
| CN203690451U (en) | Duplexer | |
| CN110350874B (en) | Microstrip power amplifier with harmonic suppression capability | |
| CN203674352U (en) | Broadband difference band pass filter based on cross-shaped resonator | |
| CN108258416B (en) | Dual-frequency broadband patch circularly polarized antenna | |
| CN104409813A (en) | Vertical interdigital filter based on source-load coupling | |
| CN209104333U (en) | A kind of rich font structure microstrip line low-pass filter | |
| CN104953216A (en) | Power processing circuit and multipath amplification circuit | |
| CN108428991A (en) | A kind of miniaturization high bandwidth steering coupler | |
| CN104143971A (en) | Negative group delay circuit | |
| CN104009271A (en) | Plane band-pass filter on the basis of four cascaded resonators | |
| CN203574080U (en) | Broadband strip line combiner | |
| CN114284677A (en) | High-selectivity broadband inverse filtering power divider based on three-wire coupling | |
| CN209169351U (en) | A kind of radio frequency integrating device | |
| CN203351719U (en) | Ultra wideband micro-strip balance filter | |
| CN202797225U (en) | Feeding type coupler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20160516 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |