CN104409811B - A kind of changeable plane bandpass and band-rejection filter - Google Patents
A kind of changeable plane bandpass and band-rejection filter Download PDFInfo
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- CN104409811B CN104409811B CN201410717450.2A CN201410717450A CN104409811B CN 104409811 B CN104409811 B CN 104409811B CN 201410717450 A CN201410717450 A CN 201410717450A CN 104409811 B CN104409811 B CN 104409811B
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Abstract
The present invention discloses a kind of changeable plane bandpass and band-rejection filter, it is produced in the manner of a printed circuit board on double-sided copper-clad micro-strip plate, being made respectively on the same face of the double-sided copper-clad micro-strip plate has for being input into the input feeder line head port1 of electromagnetic wave signal, output end feeder line head port2, first port feeder line, second port feeder line, the first micro-strip resonantor, the second micro-strip resonantor, the 3rd micro-strip resonantor, the first RF switch SW1 and the second RF switch SW2 for exporting electromagnetic wave signal.The changeable bandpass and band-rejection filter that planar structure disclosed by the invention is realized, the purpose of controlling switch state is reached by controlling the supply voltage of RF switch, and then controls the switching of wave filter, and bandpass filter is consistent with the centre frequency of bandstop filter.The present invention has the advantages that can be switched over bandstop filter in bandpass filter, centre frequency is consistent, simple structure, size are small.
Description
Technical field
The present invention relates to the technical field of plane microstrip filter, more particularly to a kind of changeable plane band logical-band resistance
Wave filter.
Background technology
In recent years, popularization, the arrival of 4G of the high speed development, 3G technology of radio communication, all indicate that wireless technology will meet
Come a booming peak period.Popularization with wireless electronic product in people's lives simultaneously, miniaturization, low cost are
Through the trend for becoming electronic product.On the other hand, with the fast development of electronic information, the frequency spectrum resource being becoming tight day is more
Scarcity, is to improve message capacity and reduce signal cross-talk between adjacent channel, selectivity to wave filter and integrated etc. is proposed
Requirement higher.And microstrip filter then meets this some requirement.
And bandstop filter must act on also more and more important as one kind of microwave filter played in microwave system.
Generally in many communication systems, it is desired to have decay higher to the noise such as unwanted interference, spuious so that signal with
Decay as small as possible is transmitted in systems.For example, when noise is disturbed especially at a certain Frequency point or certain several Frequency point
Qiang Shi, needs are suppressed using certain measure.Now, just to be had than the Wide stop bands of bandpass filter using bandstop filter
Effect is flexible more.Therefore, New Research Method come design small size, high performance bandstop filter tool be of great significance.
Microstrip bandpass filter is a kind of studied at present most, uses also most commonly used microstrip filter, its kind
Class is various, different properties, is one of mostly important element in Modern Communication System.Its effect is to allow in the range of a band frequency
Signal pass freely through, the signal beyond this frequency range is farthest decayed and cannot be passed through.Microstrip filter
Design theory basis is distributed constant, have the advantages that cheap, small volume, it is lightweight, be easy to it is integrated, therefore in modern communicationses
Very important effect is played in system.
Data is displayed in March, 2014, and Young-Ho Cho and Gabriel M.Rebeiz are in the art top phase
Entitled " Two-and is delivered on periodical " IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES "
Four-Pole Tunable 0.7-1.1-GHz Bandpass-to-Bandstop Filters With Bandwidth
The article of Control ", this article discloses a kind of wave filter of use RF switch, the RF switch possesses control band logical
The switching of wave filter and bandstop filter, but the wave filter is inconsistent, it is necessary to logical in switch opening closure front-rear center frequency
Cross varactor regulation so that reach same centre frequency before and after wave filter closure.
Meanwhile, data is additionally shown in March, 2014, the article " 0.7- of Young-Ho Cho and Gabriel M.Rebeiz
1.0-GHz Reconfigurable Bandpass-to-Bandstop Filter With Selectable 2-and 4-
Pole Responses " by the top periodical of the art " IEEE TRANSACTIONS ON MICROWAVE THEORY
AND TECHNIQUES " are employed and are prepared to deliver, and this article discloses a kind of design of wave filter, the wave filter also can be by radio frequency
Switch realizes the switching of bandpass filter and bandstop filter, but the wave filter has baroque shortcoming.
The content of the invention
Shortcoming and deficiency it is an object of the invention to overcome prior art, there is provided a kind of changeable plane band logical-band
Resistance wave filter.In wave filter design proposed by the present invention, bandpass filter utilizes multimode resonator structure, Structure Filter
Size is small and the switching of band logical-bandstop filter is controlled by RF switch, and makes both centre frequencies consistent, with design
Flexibly, small volume, low cost, the characteristics of characteristic is good.
The purpose of the present invention is achieved through the following technical solutions：
A kind of changeable plane band logical-bandstop filter, is produced on double-sided copper-clad micro-strip in the manner of a printed circuit board
The input feeder line head having for being input into electromagnetic wave signal is made on plate 1, on the same face of the double-sided copper-clad micro-strip plate 1 respectively
Port1, output end feeder line head port2, first port feeder line 4, second port feeder line 5, first for exporting electromagnetic wave signal
Micro-strip resonantor 3, the second micro-strip resonantor 2, the 3rd micro-strip resonantor 6, the first RF switch SW1 and the second RF switch SW2,
The another side of the double-sided copper-clad micro-strip plate 1 is to cover copper earth plate；
Wherein, the first resonator, the 3rd resonator line centered on the second resonator are symmetrical arranged, first port feeder line,
Second port feeder line is symmetrically arranged at the first resonator, the outside of the 3rd resonator；
First side of first port feeder line is vertical with input feeder line head port1 to be connected, the first side of second port feeder line
It is vertical with output end feeder line head port2 to be connected；
First side of the first RF switch SW1 is connected with the first side of first port feeder line, and the of the first RF switch SW1
Two sides are connected with the first micro-strip resonantor；
First side of the second RF switch SW2 is connected with the first side of second port feeder line, and the of the second RF switch SW2
Two sides are connected with the 3rd micro-strip resonantor.
Preferably, the composition of first micro-strip resonantor includes the first micro-strip 3-1 and the second micro-strip 3-2, wherein first
First side of micro-strip and the first side of the second micro-strip vertically connect l-shaped；
The composition of the 3rd micro-strip resonantor includes the 3rd micro-strip 6-1 and the 4th micro-strip 6-2, wherein the of the 3rd micro-strip
First side of side and the 4th micro-strip vertically connects into reverse L type；
Second side straight line connection of second side and the 4th micro-strip of second micro-strip, first micro-strip resonantor and institute
State the 3rd micro-strip resonantor collectively form it is U-shaped；
The composition of second micro-strip resonantor includes the 5th micro-strip, wherein the first side of the 5th micro-strip is respectively with described the
Second side of two micro-strips and the second side of the 4th micro-strip vertically connect, and direction is identical with the first micro-strip and the 3rd micro-strip.
Preferably, second side of the first RF switch SW1 is connected with the second side of the first micro-strip, second radio frequency
The second side for switching SW2 is connected with the second side of the 3rd micro-strip.
Preferably, the first port feeder line and the first micro-strip parallel and adjacent to, first port feeder line and the first micro-strip it
Between constitute the first coupling gap 7；
The second port feeder line and the 3rd micro-strip are parallel and adjacent to constituting between second port feeder line and the 3rd micro-strip
Two coupling gaps 8.
Preferably, the second side of first micro-strip, the second side of the 3rd micro-strip, the first side of first port feeder line,
First side of Two-port netwerk feeder line is located in same horizontal line, and the length of the 5th micro-strip is longer than the length of the first micro-strip and the 3rd micro-strip
Degree.
Preferably, the on off state of the first RF switch SW1 and the second RF switch SW2 is opened by controlling radio frequency
The supply voltage of pass realizes control.
Preferably, the distance of first coupling gap 7 and second coupling gap 8 is S1=0.3mm.
Preferably, the input port feeder line head port1, the port of output port feeder line head port2 are 50 ohm
Matching impedance, its length and width is L4=4.5mm and W4=2mm.
Preferably, the length and width of the first port feeder line and second port feeder line is L1=21.6mm and W3=
0.5mm。
Preferably, first micro-strip, the length of the 3rd micro-strip are L2=12.2mm, it is second micro-strip, the 4th micro-
The length of band is S2=4.65mm, first micro-strip, the 3rd micro-strip, the second micro-strip, the width of the 4th micro-strip are W2=
1mm, the length of the 5th micro-strip is L3=20mm, width are W1=0.5mm.
The present invention has the following advantages and effect relative to prior art：
1st, the present invention uses RF switch in resonator, can flexibly control wave filter in bandpass filter and bandreject filtering
Switched between device.
2nd, bandpass filter is consistent with the centre frequency of bandstop filter in wave filter design disclosed by the invention.
3rd, because wave filter is microstrip structure, small volume, lightweight, low cost, suitable industrial mass manufacture, so filtering
Device possesses simple structure, the advantage of low production cost.
Brief description of the drawings
Fig. 1 is a kind of structural representation of changeable plane band logical-bandstop filter in the present invention；
Fig. 2 is that wave filter switches to band logical to filter when the first RF switch SW1 and the second RF switch SW2 is opened in the present invention
The equivalent circuit diagram of ripple device；
Fig. 3 is that wave filter switches to band resistance to filter when the first RF switch SW1 and the second RF switch SW2 is closed in the present invention
The equivalent circuit diagram of ripple device；
Fig. 4 is a kind of dimensional drawing of changeable plane band logical-bandstop filter in the present invention；
Fig. 5 is the ADS models of RF switch SW1 and SW2；
Fig. 6 is the scattering parameter simulation result figure of the bandpass filter disclosed in the present invention；
Fig. 7 is the scattering parameter simulation result figure of the bandstop filter disclosed in the present invention；
In figure, reference is：The two-sided shoe copper micro-strip plates of 1-, the micro-strip resonantors of 2- second (the 5th micro-strip), 3- first is micro-
Band resonator, the micro-strips of 3-1- first, the micro-strips of 3-2- second, 4- first port feeder lines, 5- second port feeder lines, the micro-strips of 6- the 3rd are humorous
Shake device, the micro-strips of 6-1- the 3rd, the micro-strips of 6-2- the 4th, the coupling gaps of 7- first, the coupling gaps of 8- second.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and without
It is of the invention in limiting.
Embodiment
The structural representation and dimensional drawing of changeable plane band logical-bandstop filter that the present embodiment is proposed are respectively as schemed
Shown in 1 and Fig. 4, the changeable plane band logical-bandstop filter integral manufacturing uses machine on the medium substrate of double-sided copper-clad
The technologies such as tool is scribed, laser scoring, circuit board corrosion can easily make.
The input feeder line head having for being input into electromagnetic wave signal is made on the same face of double-sided copper-clad micro-strip plate 1 respectively
Port1, output end feeder line head port2, first port feeder line 4, second port feeder line 5, first for exporting electromagnetic wave signal
Micro-strip resonantor 3, the second micro-strip resonantor 2, the 3rd micro-strip resonantor 6, the first RF switch SW1 and the second RF switch SW2,
VSW1And VSW2It is the supply voltage of SW1 and SW2, the another side of the double-sided copper-clad micro-strip plate 1 is grounded to cover copper.Input port feeder line
Head port1, the port of output port feeder line head port2 are 50 ohm of matching impedance.
When the first RF switch SW1 and the second RF switch SW2 is opened, wave filter switches to bandpass filter, its etc.
Effect circuit diagram is as shown in Fig. 2 wherein the first micro-strip resonantor 3, the second micro-strip resonantor 2, the 3rd micro-strip resonantor 6 are filtered for band logical
The multimode resonator of ripple device；When the first RF switch SW1 and the second RF switch SW2 is closed, wave filter is bandstop filter,
Its equivalent circuit diagram as shown in figure 3, wherein the second micro-strip resonantor 2 is the minor matters of bandstop filter, the first micro-strip resonantor 3,
3rd micro-strip resonantor 6 is the main resonator of bandstop filter.
Such as the structural representation of the changeable plane band logical-bandstop filter in Fig. 1, it can also be seen that, the first resonator,
3rd resonator line centered on the second resonator is symmetrical arranged, and first port feeder line, second port feeder line are respectively symmetrically setting
In the first resonator, the outside of the 3rd resonator；
First side of first port feeder line is vertical with input feeder line head port1 to be connected, the first side of second port feeder line
It is vertical with output end feeder line head port2 to be connected；
First side of the first RF switch SW1 is connected with the first side of first port feeder line, and the of the first RF switch SW1
Two sides are connected with the first micro-strip resonantor；
First side of the second RF switch SW2 is connected with the first side of second port feeder line, and the of the second RF switch SW2
Two sides are connected with the 3rd micro-strip resonantor.
Wherein, the composition of the first micro-strip resonantor includes the first micro-strip (3-1) and the second micro-strip (3-2), wherein first is micro-
First side of band and the first side of the second micro-strip vertically connect l-shaped；
The composition of the 3rd micro-strip resonantor includes the 3rd micro-strip (6-1) and the 4th micro-strip (6-2), wherein the 3rd micro-strip
The first side and the first side of the 4th micro-strip vertically connect into reverse L type；
Second side straight line connection of second side and the 4th micro-strip of second micro-strip, first micro-strip resonantor and institute
State the 3rd micro-strip resonantor collectively form it is U-shaped；
The composition of second micro-strip resonantor includes the 5th micro-strip, wherein the first side of the 5th micro-strip is respectively with described the
Second side of two micro-strips and the second side of the 4th micro-strip vertically connect, and direction is identical with the first micro-strip and the 3rd micro-strip.
In the present embodiment, the second side, the second side of the 3rd micro-strip, the first of first port feeder line of the first micro-strip are limited
Side, the first side of second port feeder line are located in same horizontal line, and the length of the 5th micro-strip is longer than the first micro-strip and the 3rd micro-
The length of band.
In the present embodiment, also by the first RF switch SW1 and the second RF switch SW2 and the first micro-strip resonantor with
And the 3rd the annexation of micro-strip resonantor specific, concrete is limited again, because the composition of the first micro-strip resonantor is by first
First side of micro-strip and the first side of the second micro-strip vertically connect l-shaped, and the composition of the 3rd micro-strip resonantor is by the 3rd micro-strip
The first side and the first side of the 4th micro-strip vertically connect into reverse L type, therefore limit second side of the first RF switch SW1 and the
The second side connection of one micro-strip, second side of the second RF switch SW2 is connected with the second side of the 3rd micro-strip.
As shown in the structural representation of the changeable plane band logical-bandstop filter in Fig. 1, wherein first port feeder line
With the first micro-strip parallel and adjacent to constituting the first coupling gap 7 between first port feeder line and the first micro-strip；Second port feeder line
With the 3rd micro-strip parallel and adjacent to constituting the second coupling gap 8 between second port feeder line and the 3rd micro-strip.
The external sort factor of changeable plane band logical-bandstop filter can be presented by changing port in the present embodiment
The distance of the coupling gap between length, the feeder line resonator of line is accordingly adjusted.
Wave filter is emulated using simulation software Advanced Design System, the filtering of the present embodiment design
The relative dielectric constant of the micro-strip substrate that device is used is 2.55, and medium level is 0.8, and the main structure parameters of wave filter are：L1
=21.6mm, L2=12.2mm, L3=20mm, L4=4.5mm, W1=0.5mm, W2=1mm, W3=0.5mm, W4=2mm, S1=
0.3mm,S2=4.65mm.
Fig. 5 is the ADS models of the RF switch SW1 and SW2 that use, the first RF switch SW1 and the second RF switch SW2
On off state by control RF switch supply voltage realize control, wherein Ron=2.53 Ω, Lon=1.09nH, Cp=
0.22pF,Coff=45fF.VSW1And VSW2It is the supply voltage of SW1 and SW2, works as VSW1And VSW2<Switch is open shape during 1.5v
State, switches to bandpass filter；Work as VSW1And VSW2>During 3.5v, switch is in closure state, switches to bandstop filter.
Fig. 6 shows VSW1And VSW2<During 1.5v, i.e., the scattering parameter simulation result of wave filter when switch is opened, now
Wave filter is bandpass filter, and its centre frequency is 2.5GHz.Transverse axis represents the signal frequency of microstrip filter in the present invention, indulges
Axle represents the return loss (S of wave filter11), return loss represent the input power of the port signal and signal reflection power it
Between relation, its corresponding mathematical function is as follows：Reflection power/incident power==20*log | S11|.Fig. 6 also show filtering
Insertion loss (the S of device12) simulation result, insertion loss represents the output of an input power for signal and another port signal
Relation between power, its corresponding mathematical function is：Power output/input power (dB)=20*log | S12|。
Fig. 7 shows VSW1 and VSW2>During 3.5v, i.e., the scattering parameter simulation result of wave filter when switch is closed, now
Wave filter is bandstop filter, it can be seen that its centre frequency is consistent with bandpass filter.
Wave filter disclosed in embodiments of the invention has used RF switch (RF MEMS switch), can be easily
Wave filter is switched between bandpass filter and bandstop filter, and bandpass filter and bandreject filtering are made by design
The centre frequency of device is located at same frequency.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of changeable plane band logical-bandstop filter, is produced on double-sided copper-clad micro-strip plate in the manner of a printed circuit board
(1) on, it is characterised in that：
The input feeder line head having for being input into electromagnetic wave signal is made on the same face of the double-sided copper-clad micro-strip plate (1) respectively
Port1, the output end feeder line head port2 for exporting electromagnetic wave signal, first port feeder line (4), second port feeder line (5),
First micro-strip resonantor (3), the second micro-strip resonantor (2), the 3rd micro-strip resonantor (6), the first RF switch SW1 and second are penetrated
Frequency switch SW2, the another side of double-sided copper-clad micro-strip plate (1) is to cover copper earth plate；
Wherein, the first resonator, the 3rd resonator line centered on the second resonator are symmetrical arranged, first port feeder line, second
Port feedline is symmetrically arranged at the first resonator, the outside of the 3rd resonator；
First side of first port feeder line is vertical with input feeder line head port1 to be connected, the first side of second port feeder line with it is defeated
Go out to hold feeder line head port2 vertically to connect；
First side of the first RF switch SW1 is connected with the first side of first port feeder line, and the second of the first RF switch S W1
Side is connected with the first micro-strip resonantor；
First side of the second RF switch SW2 is connected with the first side of second port feeder line, and the second of the second RF switch S W2
Side is connected with the 3rd micro-strip resonantor.
2. a kind of changeable plane band logical-bandstop filter according to claim 1, it is characterised in that：
The composition of first micro-strip resonantor includes the first micro-strip (3-1) and the second micro-strip (3-2), wherein the of the first micro-strip
First side of side and the second micro-strip vertically connects l-shaped；
The composition of the 3rd micro-strip resonantor includes the 3rd micro-strip (6-1) and the 4th micro-strip (6-2), wherein the of the 3rd micro-strip
First side of side and the 4th micro-strip vertically connects into reverse L type；
Second side of second micro-strip and the second side straight line connection of the 4th micro-strip, first micro-strip resonantor and described the
Three micro-strip resonantors collectively form U-shaped；
The composition of second micro-strip resonantor includes the 5th micro-strip, wherein the first side of the 5th micro-strip is micro- with described second respectively
Second side of band and the second side of the 4th micro-strip vertically connect, and direction is identical with the first micro-strip and the 3rd micro-strip.
3. a kind of changeable plane band logical-bandstop filter according to claim 2, it is characterised in that：
Second side of the first RF switch SW1 is connected with the second side of the first micro-strip, and the of the second RF switch SW2
Two sides are connected with the second side of the 3rd micro-strip.
4. a kind of changeable plane band logical-bandstop filter according to claim 2, it is characterised in that：Described first
Port feedline and the first micro-strip are parallel and adjacent to constituting the first coupling gap (7) between first port feeder line and the first micro-strip；
The second port feeder line and the 3rd micro-strip between second port feeder line and the 3rd micro-strip parallel and adjacent to constituting the second coupling
Close gap (8).
5. a kind of changeable plane band logical-bandstop filter according to claim 2, it is characterised in that：Described first
Second side of micro-strip, the second side of the 3rd micro-strip, the first side of first port feeder line, the first side of second port feeder line are located at together
On one horizontal line, and the length of the 5th micro-strip is longer than the length of the first micro-strip and the 3rd micro-strip.
6. a kind of changeable plane band logical-bandstop filter according to claim 1, it is characterised in that：Described first
The on off state of RF switch SW1 and the second RF switch SW2 realizes control by controlling the supply voltage of RF switch.
7. a kind of changeable plane band logical-bandstop filter according to claim 4, it is characterised in that：Described first
The distance of coupling gap (7) and second coupling gap (8) is S1=0.3mm.
8. a kind of changeable plane band logical-bandstop filter according to claim 1, it is characterised in that：The input
Port feedline head port1, the port of output port feeder line head port2 are 50 ohm of matching impedance, and its length and width is equal
It is L4=4.5mm and W4=2mm.
9. a kind of changeable plane band logical-bandstop filter according to claim 1, it is characterised in that：Described first
The length and width of port feedline and second port feeder line is L1=21.6mm and W3=0.5mm.
10. a kind of changeable plane band logical-bandstop filter according to claim 2, it is characterised in that：
First micro-strip, the length of the 3rd micro-strip are L2=12.2mm, second micro-strip, the length of the 4th micro-strip are
S2=4.65mm, first micro-strip, the 3rd micro-strip, the second micro-strip, the width of the 4th micro-strip are W2=1mm, the described 5th is micro-
The length of band is L3=20mm, width are W1=0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410717450.2A CN104409811B (en) | 2014-11-26 | 2014-11-26 | A kind of changeable plane bandpass and band-rejection filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410717450.2A CN104409811B (en) | 2014-11-26 | 2014-11-26 | A kind of changeable plane bandpass and band-rejection filter |
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| CN104409811B true CN104409811B (en) | 2017-06-06 |
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| CN105914469B (en) * | 2016-06-01 | 2018-09-14 | 华南理工大学 | The microstrip line butler matrix with band-pass filtering property based on uniform impedance resonator |
| CN110165344B (en) * | 2019-05-28 | 2021-08-27 | 西南应用磁学研究所 | Resonant circuit structure of gyromagnetic filter |
| CN110336107B (en) * | 2019-06-24 | 2021-08-17 | 成都频岢微电子有限公司 | Band-pass or band-stop reconfigurable HMSIW filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949311A (en) * | 1997-06-06 | 1999-09-07 | Massachusetts Institute Of Technology | Tunable resonators |
| CN101212076A (en) * | 2007-12-21 | 2008-07-02 | 北京信息工程学院 | Micro mechanical adjustable microwave band-pass filter |
| WO2008088144A1 (en) * | 2007-01-18 | 2008-07-24 | Sung Il Kim | Tunable device for microwave/millimeter wave application using a transmission line strip |
| CN204205009U (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | A kind of switchable planar band leads to-band stop filter |
-
2014
- 2014-11-26 CN CN201410717450.2A patent/CN104409811B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949311A (en) * | 1997-06-06 | 1999-09-07 | Massachusetts Institute Of Technology | Tunable resonators |
| WO2008088144A1 (en) * | 2007-01-18 | 2008-07-24 | Sung Il Kim | Tunable device for microwave/millimeter wave application using a transmission line strip |
| CN101212076A (en) * | 2007-12-21 | 2008-07-02 | 北京信息工程学院 | Micro mechanical adjustable microwave band-pass filter |
| CN204205009U (en) * | 2014-11-26 | 2015-03-11 | 华南理工大学 | A kind of switchable planar band leads to-band stop filter |
Non-Patent Citations (1)
| Title |
|---|
| A Reconfigurable Bandpass-Bandstop Filter Based on Varactor-Loaded Closed-Ring Resonators;Yi-Ming Chen et al;《IEEE MICROWAVE MAGAZINE》;20090228;全文 * |
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