CN101764276A - Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure - Google Patents
Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure Download PDFInfo
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- CN101764276A CN101764276A CN200910234280A CN200910234280A CN101764276A CN 101764276 A CN101764276 A CN 101764276A CN 200910234280 A CN200910234280 A CN 200910234280A CN 200910234280 A CN200910234280 A CN 200910234280A CN 101764276 A CN101764276 A CN 101764276A
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Abstract
The invention discloses a quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure, which relates to a microwave band-pass filter of a miniaturization micro-strip/coplanar waveguide composite structure prepared through a printed circuit board technique. The filter can be applied into microwave circuits and microwave integrated circuits in various electronic equipment, and is beneficial for integration and miniaturization of the circuits. A quarter-wave resonant cavity (1) adopts a coplanar waveguide structure; while micro-strip lines (2) are adopted as input and output transmission lines; the input and output micro-strip lines are arranged in the same side of a metal plane (3) for preparing coplanar waveguide or arranged in the different side of the metal plane for preparing coplanar waveguide; the quarter-wave resonant cavity (1) is 'U'-shaped; the micro-strip lines (2) are adopted as the input and output transmission lines and are arranged at the two sides of the quarter-wave resonant cavity (1); and the two pieces of input and output transmission lines adopt the micro-strip lines (2) which are respectively provided with two input and output directions.
Description
Technical field
What the present invention relates to is a kind of little band of miniaturization/co-planar waveguide mixed structure microwave band-pass filter that adopts printed circuit board technology to make.This filter can be applicable to microwave circuit and the microwave integrated circuit in the various electronic equipments, and its use helps the integrated and miniaturization of circuit, belongs to microwave technical field.
Background technology
Microwave filter be a kind of in microwave and radio circuit widely used passive device, the quality of its index directly influences the performance of whole system.Common microwave filter adopts microwave transmission lines such as metal waveguide, coaxial line, microstrip line, strip line or co-planar waveguide to make more.In recent years, because the miniaturization of communication system, microminiaturized requirement are more and more higher,, also accordingly more and more higher to the requirement of the miniaturization Design of filter as one of intrasystem crucial passive device.Adopt stereochemical structures such as relative waveguide of planar structure microwave filter such as microstrip line, strip line or co-planar waveguide that printed circuit board technology makes or coaxial line, have simple in structure, easy to process, with low cost and be easy to and the integrated advantage of other active/passive circuit, become main research direction in recent years, wherein, adopt one of emphasis that the filter in quarter-wave resonance chamber studies especially.Adopt the quarter-wave resonance chamber to design and produce filter and mainly contain two advantages, at first its size is compared and is adopted the filter of half-wavelength resonant cavity much smaller; Next is that loss also can obtain tangible improvement because be radiation loss or conductor losses the former all should be littler.Classical quarter-wave resonance cavity filter is based on the half-wavelength parallel coupled line filter of microstrip structure, change the open a way structure of a terminal shortcircuit of an end into by half-wavelength line segment with original two ends open circuit, make it become quarter-wave resonant cavity, thereby realize reducing of filter size.This classical architecture has a wide range of applications, and can change microstrip structure into strip lines configuration and improve loss objective.The major defect of this structure is to adopt the ground connection via hole in a large number, can influence its performance index when frequency is higher; When needing close coupling between two parallel lines, the ordinary printed process for manufacturing circuit board is difficult to guarantee the reliability of slight gap between two parallel lines in addition.
Summary of the invention
Technical problem: the objective of the invention is to problem at little band parallel coupled line structure existence of above-mentioned classics, the quarter-wave resonance chamber band pass filter of a kind of little band/co-planar waveguide mixed structure has been proposed, this structure adopts coplanar waveguide structure quarter-wave resonance chamber to replace original microstrip line, utilizes the design feature that co-planar waveguide is convenient to ground connection to solve the defective of via hole ground connection.
Technical scheme: the structure of quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure of the present invention is: coplanar waveguide structure is adopted in the quarter-wave resonance chamber, adopt microstrip line and import, export transmission line, this input, output microstrip line are located at the same one side of the metal flat of making co-planar waveguide, or are located at the not coplanar of the metal flat of making co-planar waveguide; The quarter-wave resonance chamber is " U " shape, and input, output transmission line adopt microstrip line to be positioned at the both sides in quarter-wave resonance chamber, and two inputs, output transmission lines adopt microstrip line that both direction input, output are arranged respectively.
The band pass filter that the quarter-wave resonance chamber is made of the cascade of two quarter-wave co-planar waveguide resonant cavitys, the opening direction in two quarter-wave resonance chambeies is opposite.
3,4 or the outer band pass filter that suppresses of more quarter-wave resonance chamber cascade formation high-band are adopted in the quarter-wave resonance chamber.
Beneficial effect: microstrip line is still adopted in the I/O of filter, the quarter-wave resonance chamber is then realized by the open a way co-planar waveguide line segment of a terminal shortcircuit of an end, and input, output microstrip line can design the same one side (shown in accompanying drawing 1 last figure) at the metal flat of making co-planar waveguide, also can design the not coplanar (shown in accompanying drawing 1 figure below) at the metal flat of making co-planar waveguide, this has brought bigger flexibility with regard to the design of giving filter construction.Advantage of the present invention: simple in structure, size is little, be easy to make, superior performance.
Description of drawings
Fig. 1 is its input of filter among the present invention, the structural representation that the output microstrip line is produced on the same one side of co-planar waveguide.
Its input of filter among Fig. 2 the present invention, output microstrip line are produced on the structural representation on the two sides of co-planar waveguide.
Fig. 3 is the transmission parameter of centre frequency filter when being 2.1GHz and the frequency characteristic of reflection parameters, also promptly uses vector network analyzer to measure to obtain | S
21|, | S
11|.
Have among the figure: quarter-wave co-planar waveguide resonant cavity 1, input, output microstrip line 2, the metal covering 3 of making co-planar waveguide, medium substrate 4.
Embodiment
In the quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure of the present invention, coplanar waveguide structure is adopted in quarter-wave resonance chamber 1, adopt microstrip line 2 and import, export transmission line, this input, output microstrip line are located at the same one side of the metal flat 3 of making co-planar waveguide, or are located at the not coplanar of the metal flat of making co-planar waveguide; Quarter-wave resonance chamber 1 is " U " shape, and input, output transmission line adopt microstrip line 2 to be positioned at the both sides in quarter-wave resonance chamber 1, and two inputs, output transmission lines adopt microstrip line 2 that both direction input, output are arranged respectively.
Embodiment 1 (contrast accompanying drawing 1): medium substrate 4 selects that relative dielectric constants are 10, thickness is 1.0 millimeters, it is 50 ohm that I/O microstrip line 2 is got characteristic impedance, the size of co-planar waveguide 1 is taken as the 0.3-1.5-0.3 millimeter, length is got 14.4 millimeters, interval between two co-planar waveguide resonant cavitys is taken as 0.2 millimeter, coupled section length partly is 5.6 millimeters between two resonant cavitys, overlap between I/O microstrip line and the co-planar waveguide resonant cavity, lap is of a size of 0.6 millimeter, 4.5 millimeters of simultaneously vertical indentations, structure are symmetrical fully up and down.
Claims (3)
1. quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure, it is characterized in that quarter-wave resonance chamber (1) employing coplanar waveguide structure, adopt microstrip line (2) and import, export transmission line, this input, output microstrip line are located at the same one side of the metal flat (3) of making co-planar waveguide, or are located at the not coplanar of the metal flat of making co-planar waveguide; Quarter-wave resonance chamber (1) is " U " shape, and input, output transmission line adopt microstrip line (2) to be positioned at the both sides of quarter-wave resonance chamber (1), and two inputs, output transmission lines adopt microstrip line (2) that both direction input, output are arranged respectively.
2. quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure according to claim 1, it is characterized in that the band pass filter that quarter-wave resonance chamber (1) is made of two quarter-wave co-planar waveguide resonant cavitys (1) cascade, the opening direction in two quarter-wave resonance chambeies (1) is opposite.
3. quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure according to claim 1 is characterized in that 3,4 of quarter-wave resonance chamber (1) employings or the cascade of more quarter-wave resonance chamber (1) constitute the outer band pass filter that suppresses of high-band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910234280A CN101764276A (en) | 2009-11-16 | 2009-11-16 | Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910234280A CN101764276A (en) | 2009-11-16 | 2009-11-16 | Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure |
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| CN101764276A true CN101764276A (en) | 2010-06-30 |
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| CN200910234280A Pending CN101764276A (en) | 2009-11-16 | 2009-11-16 | Quarter-wave resonant cavity band-pass filter of micro-strip coplanar waveguide composite structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958442A (en) * | 2010-08-06 | 2011-01-26 | 华东交通大学 | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure |
| CN102637924A (en) * | 2011-02-10 | 2012-08-15 | 佳能株式会社 | Printed circuit board |
| US9042847B2 (en) | 2012-11-08 | 2015-05-26 | Hauwei Technologies Co., Ltd. | Filter, receiver, transmitter and transceiver |
| CN105228334A (en) * | 2015-08-26 | 2016-01-06 | 昆山龙腾光电有限公司 | A kind of printed circuit board (PCB) |
| CN112864549A (en) * | 2021-01-07 | 2021-05-28 | 南京邮电大学 | Novel miniaturized differential phase shifter of multichannel broadband |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3745489A (en) * | 1972-05-01 | 1973-07-10 | Stanford Research Inst | Microwave and uhf filters using discrete hairpin resonators |
| US3754198A (en) * | 1972-03-20 | 1973-08-21 | Itt | Microstrip filter |
| CN1549387A (en) * | 2003-05-21 | 2004-11-24 | 海泰超导通讯科技（天津）有限公司 | Contact type anti-parallel hair-pin comb type wave filter for microwave communication |
-
2009
- 2009-11-16 CN CN200910234280A patent/CN101764276A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3754198A (en) * | 1972-03-20 | 1973-08-21 | Itt | Microstrip filter |
| US3745489A (en) * | 1972-05-01 | 1973-07-10 | Stanford Research Inst | Microwave and uhf filters using discrete hairpin resonators |
| CN1549387A (en) * | 2003-05-21 | 2004-11-24 | 海泰超导通讯科技（天津）有限公司 | Contact type anti-parallel hair-pin comb type wave filter for microwave communication |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958442A (en) * | 2010-08-06 | 2011-01-26 | 华东交通大学 | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure |
| CN101958442B (en) * | 2010-08-06 | 2013-01-09 | 华东交通大学 | Microwave three-frequency band-pass filter based on wedged SIR (Signal to Interference Ratio) structure |
| CN102637924A (en) * | 2011-02-10 | 2012-08-15 | 佳能株式会社 | Printed circuit board |
| CN102637924B (en) * | 2011-02-10 | 2014-07-16 | 佳能株式会社 | Printed circuit board |
| US8957746B2 (en) | 2011-02-10 | 2015-02-17 | Canon Kabushiki Kaisha | Parallel 1/4 wavelength line frequency filter |
| US9042847B2 (en) | 2012-11-08 | 2015-05-26 | Hauwei Technologies Co., Ltd. | Filter, receiver, transmitter and transceiver |
| CN105228334A (en) * | 2015-08-26 | 2016-01-06 | 昆山龙腾光电有限公司 | A kind of printed circuit board (PCB) |
| CN105228334B (en) * | 2015-08-26 | 2018-10-02 | 昆山龙腾光电有限公司 | a kind of printed circuit board |
| CN112864549A (en) * | 2021-01-07 | 2021-05-28 | 南京邮电大学 | Novel miniaturized differential phase shifter of multichannel broadband |
| CN112864549B (en) * | 2021-01-07 | 2021-10-19 | 南京邮电大学 | Novel miniaturized differential phase shifter of multichannel broadband |
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Application publication date: 20100630 |