CN202977666U - High selectivity step impedance line filter - Google Patents
High selectivity step impedance line filter Download PDFInfo
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- CN202977666U CN202977666U CN 201220622630 CN201220622630U CN202977666U CN 202977666 U CN202977666 U CN 202977666U CN 201220622630 CN201220622630 CN 201220622630 CN 201220622630 U CN201220622630 U CN 201220622630U CN 202977666 U CN202977666 U CN 202977666U
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- high selectivity
- line
- stepped impedance
- step impedance
- microstrip line
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Abstract
A high selectivity step impedance line filter disclosed by the utility model relates to the field of electronic communication and aims to solve the technical problems that in traditional uniform impedance line filters, stopband rejection is relatively poor and strays are very close to passbands. The high selectivity step impedance line filter disclosed by the utility model is composed of four U-shaped step impedance microstrip lines which are arranged from left to right. Each of the U-shaped step impedance microstrip lines is composed of three parts, i.e., coupling sections at the two ends and an intermediate section, wherein the length of the microstrip line of each coupling section is a quarter of the wavelength; the length of the microstrip line of the intermediate section is half of the wavelength; and the coupling sections of the adjacent U-shaped step impedance microstrip lines are cooperatively arranged in parallel.
Description
Technical field
The utility model relates to electronic communication field, particularly a kind of high selectivity Stepped Impedance line filter for active circuits such as oscillator, frequency mixer, amplifiers.
Background technology
In the active circuits such as oscillator, frequency mixer, amplifier, conventional filter has obvious technical disadvantages because of the ability that does not have the spuious scope of random control, and traditional uniform impedance line filter, although method for designing is ripe simple, be convenient to that circuit is integrated, characteristics that can be applied to upper frequency make it obtain integrated circuit's teacher favor, but the stopband rejection ratio is relatively poor, spuious from passband very close to, this has limited again the scope of application of this type of filter greatly.
Summary of the invention
The utility model be intended to solve traditional uniform impedance line filter exist the stopband rejection ratio relatively poor, spuious from passband the technical problem such as close to very, a kind of stopband suppresses to provide, spuious high selectivity Stepped Impedance line filter away from passband.
The purpose of this utility model is achieved through the following technical solutions.
High selectivity Stepped Impedance line filter of the present utility model, consisted of by four sections U-shaped Stepped Impedance microstrip lines arranging from left to right, every section U-shaped Stepped Impedance microstrip line is made of coupled section and stage casing three parts at two ends, wherein the microstrip line length of each coupled section is quarter-wave, the microstrip line length in stage casing is 1/2nd wavelength, and the coupled section of adjacent U-shaped Stepped Impedance microstrip line matches and is arranged in parallel.
High selectivity Stepped Impedance line filter of the present utility model, the microstrip line of wherein said coupled section is Low ESR, the microstrip line in stage casing is high impedance.
The beneficial effect of the utility model high selectivity Stepped Impedance line filter: volume is little, bears power large, and stopband is wide, and aspect the control spurious response, certain degree of freedom is being arranged.
Description of drawings
Fig. 1 Stepped Impedance microstrip line
Fig. 2 the utility model structural representation
Fig. 3 simulation result schematic diagram of the present utility model
Fig. 4 equivalent circuit theory figure of the present utility model
The number in the figure explanation:
The L quarter-wave
Embodiment
The utility model detailed construction, application principle, effect and effect with reference to accompanying drawing 1-4, are explained by following execution mode.
Consult shown in Fig. 1-2, high selectivity Stepped Impedance line filter of the present utility model, consisted of by four sections U-shaped Stepped Impedance microstrip lines arranging from left to right, every section U-shaped Stepped Impedance microstrip line is made of coupled section and stage casing three parts at two ends, wherein the microstrip line length of each coupled section is quarter-wave, the microstrip line length in stage casing is 1/2nd wavelength, and the coupled section of adjacent U-shaped Stepped Impedance microstrip line matches and is arranged in parallel.
High selectivity Stepped Impedance line filter of the present utility model is realized with Stepped Impedance line resonator.The length of Stepped Impedance line resonator can be selected wavelength, half wavelength and a quarter-wave.Usually in order to reduce filter size, can select quarter-wave Stepped Impedance line to realize.The structure of quarter-wave Stepped Impedance resonator as shown in Figure 1.
The distinguishing feature of Stepped Impedance resonator filter can recently be adjusted resonator length and corresponding stray resonance frequency by changing impedance exactly.The impedance ratio of Stepped Impedance is
, establish minimum stray resonance frequency and be
, fundamental resonance frequency is
, the pass between the three is:
Can be found out by above formula, as long as determined the centre frequency of filter, its minimum spurious frequency just can recently obtain by regulating impedance as required so, has the very large degree of freedom.
Quadravalence frequency of heart of design of Simulation is
Be 1GHz, spurious frequency
=2.5
Parallel coupling Stepped Impedance line filter.The structure chart of this filter as shown in Figure 2, simulation result is as shown in Figure 3.Can find out from simulation result, the outer minimum spurious frequency of the band of this filter has been controlled in 2
The place.As seen, utilize the Stepped Impedance line to make resonator, can as required the band stray frequency be suppressed to distant place.
Fig. 4 is artificial circuit figure of the present utility model, and wherein w represents the width of microstrip line, and L represents the length of microstrip line, and s represents two gaps between parallel coupled line, and the Angle representative bends to the angle of curved line, and Radius represents the radius of curved line.Z=50 Ohm represents the input and output impedance.To folding back to save the shared length of whole filter space, the length of coupling unit is quarter-wave to this filter with every Stepped Impedance line.Be that high impedance, two ends are low-impedance form in the middle of the Stepped Impedance line adopts, to reach the purpose that suppresses spuious.
Therefore, high selectivity Stepped Impedance line filter of the present utility model, have volume little, bear that power is large, stopband is wide and certain many technological merits such as the degree of freedom arranged aspect spurious response controlling.
Claims (2)
1. high selectivity Stepped Impedance line filter, it is characterized in that: consisted of by four sections U-shaped Stepped Impedance microstrip lines arranging from left to right, every section U-shaped Stepped Impedance microstrip line is made of coupled section and stage casing three parts at two ends, wherein the microstrip line length of each coupled section is quarter-wave, the microstrip line length in stage casing is 1/2nd wavelength, and the coupled section of adjacent U-shaped Stepped Impedance microstrip line matches and is arranged in parallel.
2. high selectivity Stepped Impedance line filter according to claim 1, it is characterized in that: the microstrip line of described coupled section is Low ESR, the microstrip line in stage casing is high impedance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622630 CN202977666U (en) | 2012-11-22 | 2012-11-22 | High selectivity step impedance line filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220622630 CN202977666U (en) | 2012-11-22 | 2012-11-22 | High selectivity step impedance line filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202977666U true CN202977666U (en) | 2013-06-05 |
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ID=48518701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220622630 Expired - Fee Related CN202977666U (en) | 2012-11-22 | 2012-11-22 | High selectivity step impedance line filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202977666U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393382A (en) * | 2014-11-26 | 2015-03-04 | 西安电子科技大学 | High order miniature narrowband bandpass filter with wide stopband character |
| CN105356020A (en) * | 2015-12-17 | 2016-02-24 | 东南大学 | Quarter-wavelength step-impedance resonator-based band-pass filter and design method |
| CN110931926A (en) * | 2019-11-12 | 2020-03-27 | 郴州世通科技有限公司 | Microstrip line filter |
| CN113629371A (en) * | 2020-05-09 | 2021-11-09 | 大富科技(安徽)股份有限公司 | Filter and communication equipment |
-
2012
- 2012-11-22 CN CN 201220622630 patent/CN202977666U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393382A (en) * | 2014-11-26 | 2015-03-04 | 西安电子科技大学 | High order miniature narrowband bandpass filter with wide stopband character |
| CN105356020A (en) * | 2015-12-17 | 2016-02-24 | 东南大学 | Quarter-wavelength step-impedance resonator-based band-pass filter and design method |
| CN105356020B (en) * | 2015-12-17 | 2019-01-04 | 东南大学 | Bandpass filter and design method based on quarter-wave step impedance resonator |
| CN110931926A (en) * | 2019-11-12 | 2020-03-27 | 郴州世通科技有限公司 | Microstrip line filter |
| CN113629371A (en) * | 2020-05-09 | 2021-11-09 | 大富科技(安徽)股份有限公司 | Filter and communication equipment |
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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: 20130605 Termination date: 20151122 |