CN103887583B - Micro-strip triplexer - Google Patents
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- CN103887583B CN103887583B CN201210564044.8A CN201210564044A CN103887583B CN 103887583 B CN103887583 B CN 103887583B CN 201210564044 A CN201210564044 A CN 201210564044A CN 103887583 B CN103887583 B CN 103887583B
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Abstract
A kind of micro-strip triplexer, including: three microstrip filters, impedance matching minor matters, described three microstrip filters are connected with described impedance matching minor matters respectively, described impedance matching minor matters are provided with antenna opening, described microstrip filter includes resonator, in described three microstrip filters, the resonator length of at least one microstrip filter is the quarter-wave that microstrip filter frequency range mid frequency is corresponding, and the resonator length of other microstrip filters is 1/2nd wavelength that microstrip filter frequency range mid frequency is corresponding.Micro-strip triplexer of the present invention, by the resonator length of microstrip filter is set to the quarter-wave that wave filter frequency range mid frequency is corresponding, solves the problem that two times of relations can not occur in three frequency ranges, it is achieved the good isolation between three frequency signals.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to micro-strip triplexer.
Background technology
For a FDD(Frequency Division Duplex, FDD) system or a multimode
For system, the Signal separator of the multiple frequency ranges received and dispatched by antenna is needed to come, so that system can be same
Time process the signal of multiple frequency range, and transmitting-receiving do not interfere with each other while carry out.As for three frequency band signals
Separating, conventionally employed two ways is carried out, and one is that a duplexer adds radio-frequency (RF) switch and adds a wave filter again
Form, this implementation need parts more, Insertion Loss is big, it is difficult to realize low cost；Another way
Being to use the triplexer that can simultaneously process three frequencies to realize, which only needs a device, inserts
Damage less, low cost can be realized.
Multiplexer has the most in the industry cycle had a certain degree of research, the main mode used have microstrip line triplexer,
Multiple structure triplexer, pottery triplexer and cavity triplexer etc., wherein, micro-strip triplexer has cost
The advantage that other triplexers such as processing low, easy, flexible design are incomparable.
When tradition triplexer uses microstrip line to realize, the coupling between three passages of triplexer all uses
The structure that structure is complex, each passage wave filter based on 1/2nd wave resonator designs the most more
Complexity, volume is relatively big, port arrange unreasonable when applying for triplexer the layout of peripheral circuit make troubles,
And because the periodicity of microstrip line, can not there is the relation of two times in three frequency ranges, and no person can not realize three
The isolation of frequency range.
Summary of the invention
For above-mentioned problems of the prior art, it is an object of the invention to provide a kind of micro-strip triplexer,
It can solve the good isolating problem between three frequency signals of various frequency interval.
For reaching above-mentioned purpose, the present invention by the following technical solutions:
A kind of micro-strip triplexer, including:
Three microstrip filters, impedance matching minor matters, described three microstrip filters respectively with described impedance
Joining minor matters to connect, described impedance matching minor matters are provided with antenna opening, and described microstrip filter includes resonator, institute
Stating the resonator length of at least one microstrip filter in three microstrip filters is microstrip filter frequency range center
The quarter-wave that frequency is corresponding, the resonator length of other microstrip filters is in microstrip filter frequency range
/ 2nd wavelength that frequency of heart is corresponding.
Above-mentioned micro-strip triplexer, by being set to wave filter frequency range center frequency by the resonator length of microstrip filter
The quarter-wave that rate is corresponding, solves the problem that two times of relations can not occur in three frequency ranges, it is achieved three
Good isolation between frequency signal.
Wherein in an embodiment, described microstrip filter is hair clip type wave filter.
Above-mentioned micro-strip triplexer, employing compact conformation simple hair clip mode filter, beneficially layout and design,
And work in three different frequency ranges.
Wherein in an embodiment, described impedance matching minor matters are double T impedance matching minor matters, described couple of T
Impedance matching minor matters include that two T-shaped minor matters of cascade, described pair of T impedance matching minor matters are the double T of microstrip line
Impedance matching minor matters, the double T impedance matching minor matters of described microstrip line are filtered with described micro-strip with straight line or curve form
Ripple device matches.
Above-mentioned micro-strip triplexer, uses by two T-shaped between the microstrip filter of antenna opening and three paths
Double T impedance matching minor matters that minor matters cascade is constituted are attached, and are used for realizing impedance matching, thus realize each
The superperformance of passband, all brings bigger convenience to design and making.
Wherein in an embodiment, the resonator of the most one or more microstrip filters connects open circuit
Minor matters, described open circuit minor matters are the microstrip line open circuit minor matters of straight line or curve.
Above-mentioned micro-strip triplexer, in the microstrip filter of triplexer, introducing open circuit minor matters are to produce transmission zero,
Improve near-end suppression, thus improve while not increasing microstrip filter exponent number and Insertion Loss triplexer every
From degree.
Accompanying drawing explanation
Fig. 1 is the micro-strip triplexer structural representation of the embodiment of the present invention；
Fig. 2 is the hair clip type filter construction schematic diagram that the present invention works in frequency range 1；
Fig. 3 is the hair clip type filter construction schematic diagram that the present invention works in frequency range 2；
Fig. 4 is the hair clip type filter construction schematic diagram that the present invention works in frequency range 3；
Fig. 5 is double-T impedance matching minor matters structural representation of the present invention；
Fig. 6 is that micro-strip triplexer is applied to DCS-1800 up-downgoing and intercepts the triplexer design of 900MHz
Frequency response schematic diagram.
Detailed description of the invention
Below in conjunction with better embodiment therein, the present invention program is described in detail.
The micro-strip triplexer of the present invention includes:
Three microstrip filters, impedance matching minor matters, described three microstrip filters respectively with described resistance
Anti-coupling minor matters connect, and described impedance matching minor matters are provided with antenna opening, and described microstrip filter includes resonator,
In described three microstrip filters, the resonator length of at least one microstrip filter is wave filter frequency range center frequency
The quarter-wave that rate is corresponding, the resonator length of other microstrip filters is microstrip filter frequency range center
/ 2nd wavelength that frequency is corresponding.Syntagmatic can be the resonator length of only one of which microstrip filter
For quarter-wave, remaining is 1/2nd；Have the resonator length of two microstrip filters be four/
One wavelength, remaining is 1/2nd；The resonator length of all microstrip filters is quarter-wave.
Micro-strip triplexer of the present invention, by being set to wave filter frequency range mid frequency by the resonator length of microstrip filter
Corresponding quarter-wave, solves the problem that two times of relations can not occur in three frequency ranges, it is achieved three frequencies
Good isolation between rate signal.
Wherein in an embodiment, microstrip filter is hair clip type wave filter.Employing compact conformation is simple
Hair clip mode filter, beneficially layout and design, and work in three different frequency ranges.Three microstrip filters
Work in different frequency ranges, respectively frequency range 1, frequency range 2, frequency range 3 respectively.Described works in frequency range 1
Or the number of the resonator of the microstrip filter of frequency range 2 or frequency range 3 is more than or equal to two, i.e. microstrip filter
Exponent number more than or equal to two rank, according to Out-of-band rejection and Insertion Loss need select exponent number.Resonator can be four
/ mono-wave resonator, it is also possible to be 1/2nd wave resonator, according to frequency range 1, frequency range 2, frequency range
Depending on relation between 3.Such as, the signal frequency received when the hair clip type wave filter of frequency range 2 is frequency range 1
During the twice of signal frequency that hair clip type wave filter receives, the resonator length of the hair clip type wave filter of frequency range 1
For the quarter-wave that wave filter frequency range 1 mid frequency is corresponding.When the hair clip type wave filter of frequency range 2 receives
The hair clip type wave filter that signal frequency is frequency range 1 receive three times of signal frequency time, the hair clip of frequency range 1
The resonator length of mode filter is 1/2nd wavelength that wave filter frequency range 1 mid frequency is corresponding.Micro-strip is filtered
The port feed of ripple device can use couple feed that tap can also be used to feed, and sets with specific reference to needs.
Wherein one or more microstrip filters can introduce as required open circuit minor matters to produce transmission zero, thus
Improve the near-end suppression of microstrip filter.
Wherein in an embodiment, impedance matching minor matters are double T impedance matching minor matters, double T impedance matchings
Minor matters include two T-shaped minor matters of cascade, and double T impedance matching minor matters are the double T impedance matching minor matters of microstrip line,
The double T impedance matching minor matters of microstrip line match with microstrip filter with straight line or curve form, i.e. the double T of microstrip line
Impedance matching minor matters can be straight line, it is also possible to is curved according to the needs of layout.Its width and length
It is provided for the antenna end impedance matching to each microstrip filter end, needs after impedance matching to meet from antenna end
See the function that port Impedance is frequency to each wave filter, as a example by frequency range 1, see and filter to frequency range 1 micro-strip
Input impedance during device is 50Ohm in frequency range 1, and the impedance in frequency range 2 and frequency range 3 is close to open circuit,
The input impedance of other two frequency microstrip filters also should meet similar relation.
The hair clip type wave filter that the signal frequency received with the hair clip type wave filter of frequency range 2 is frequency range 1 receives
Illustrating as a example by the twice of signal frequency, see Fig. 1, the micro-strip triplexer structure for the embodiment of the present invention is shown
It is intended to.Including:
Three microstrip filters working in different frequency range: the hair clip type wave filter 11 of frequency range 1, frequency range 2
Hair clip type wave filter 12, the hair clip type wave filter 13 of frequency range 3, and the cascade of two T-shaped minor matters constitute double
T impedance matching minor matters 14.Double T impedance matching minor matters 14 are provided with antenna opening, and antenna opening is arranged at described micro-strip
One end of triplexer, the isolation end of described three microstrip filters is arranged at the other end of described micro-strip triplexer,
The public port (antenna opening) of i.e. three passages and the isolated port of three passages use back-to-back form to enter
Row layout.
As in figure 2 it is shown, work in the hair clip type filter construction schematic diagram of frequency range 1 for the present invention.Frequency range 1
Hair clip type wave filter be designed as 4 rank, four resonators are arranged in parallel.The hair clip type wave filter of frequency range 1
Each resonator length is the quarter-wave that wave filter frequency range mid frequency is corresponding, each resonator in
Inverted U-shaped, each resonator one end is short circuit for open circuit one end, and short-circuit end adds a grounding through hole 21, is used for
Ground connection.The bandwidth of microstrip filter is determined by the spacing between resonator.The feed of microstrip filter uses coupling
The mode closing feed is carried out, it would however also be possible to employ the mode of tap feed.The feeder line 22 on the left side and microstrip filter
One limit of one resonator 23 of Far Left is coupled, feeder line 24 and the microstrip filter rightmost one on the right
One limit of individual resonator 25 is coupled, and spacing and length that feeder line couples with resonator may serve to optimize
The band internal characteristic of microstrip filter.In order to more preferably triplexer is laid out, left side port 26 is arranged on micro-
The top of band filter, and the right port 27 is arranged on the lower section of microstrip filter.
As it is shown on figure 3, work in the hair clip type filter construction schematic diagram of frequency range 2 for the present invention.This frequency range 2
Hair clip type wave filter be designed as 3 rank, be made up of side by side three resonators.The hair clip type wave filter of frequency range 2
Each resonator length be 1/2nd wavelength that wave filter frequency range 2 mid frequency is corresponding, resonator two ends
All open a way.First resonator 31 is in inverted U-shaped, and second resonator 32 takes the shape of the letter U, the 3rd resonator
33 in inverted U-shaped.The first open circuit minor matters 34, the first open circuit minor matters are connected in the lower end of second resonator 32
34 can be straight line or curve, for convenience layout, and these minor matters are made up of three sections of lines, take the shape of the letter U, including
The bottom minor matters of left minor matters the 36, first open circuit minor matters of right minor matters the 35, first open circuit minor matters of one open circuit minor matters
37.The right minor matters 35 of the first open circuit minor matters are connected with the lower end of second resonator 32, the first open circuit minor matters
Left minor matters 36 adjacent with first resonator 31, be positioned at its left side, the bottom minor matters of the first open circuit minor matters
37 is adjacent with the open end of first resonator 31.These the first open circuit minor matters 34 are for introducing at passband near-end
Transmission zero, its length about needs to introduce the quarter-wave corresponding to transmission zero frequency.With frequency range 1
Microstrip filter consistent, the bandwidth of microstrip filter can be regulated by the spacing between resonator.
The port feed of microstrip filter uses the mode of tap, and the position regulating two taps 38,39 can be to micro-
The frequency response band internal characteristic of band filter is optimized.
As shown in Figure 4, the hair clip type filter construction schematic diagram of frequency range 3 is worked in for the present invention.This frequency range 3
Hair clip type wave filter be designed as 4 rank, be made up of side by side 4 resonators 41,42,43,44.Frequency range 3
The resonator length of hair clip type wave filter be 1/2nd wavelength that wave filter frequency range 3 mid frequency is corresponding,
All open a way in resonator two ends.Wherein the first resonator 41 and the 3rd resonator 43 are in inverted U-shaped, the second resonance
Device 42 and the 4th resonator 44 take the shape of the letter U.The second open circuit minor matters are connected in the lower end of second resonator 42
45, the second open circuit minor matters 45 are in bow action, and wherein bow font mid portion is toward curved on the right of microstrip filter
Song, to realize the compactest layout, these open circuit minor matters introduce transmission zero for frequency range 3 passband near-end,
Its length about needs to introduce the quarter-wave corresponding to transmission zero frequency.Filter with the micro-strip of frequency range 1
Ripple device is consistent, and the bandwidth of microstrip filter can be regulated by the spacing between resonator.Micro-strip filters
The port feed of device uses the mode of tap, and the position regulating two taps 46,47 can be to microstrip filter
Frequency response band internal characteristic be optimized.
See Fig. 5, for double-T impedance matching minor matters structural representation of the present invention, two T-shaped minor matters connect
Connecing and form, be T1 minor matters 51 and T2 minor matters 52 respectively, the lower minor matters 53 of T1 minor matters are 50Ohm micro-strip
Line, lower minor matters 53 lower end arranges antenna opening 54, left minor matters 55 and frequency range 1 microstrip filter of T1 minor matters
A port be connected, the right minor matters 56 of T1 minor matters are connected with T2 minor matters 52, in order to structure is the compactest,
Carry out repeatedly bending to right minor matters.If the right minor matters length of T1 minor matters is shorter, then without bending.T2
The left minor matters 57 of minor matters are connected with the port working in frequency range 2 microstrip filter, the right minor matters of T2 minor matters
58 are connected with a port in frequency range 3 microstrip filter, in order to compact conformation is filtered with being connected to two micro-strip
The port of ripple device, the left and right minor matters of T2 minor matters are all bent.The width of minor matters 55,56,57,58 and length
Selection be used to impedance matching so that do not filtered by other two micro-strip in three respective bands of microstrip filter
Ripple device is disturbed.
Micro-strip triplexer of the present invention can utilize traditional common metal micro-strip to realize, it is also possible to uses high-temperature superconductor
Material realizes.
Triplexer of the present invention can be by the principle of passages different for the Signal separator of three different frequencies to three
For: devising three microstrip filters working in different frequency in triplexer, three microstrip filters divide
Can not use 1/2nd wavelength and quarter-wave resonator, avoid the cycle of microstrip line with this
Property is the restriction on frequency interval that the application of the present invention brings, i.e. frequency 1, frequency 2 and frequency 3 is permissible
It it is the relation of two frequencys multiplication or frequency tripling.When being two frequency multiplication relations, use quarter-wave, when being three
During frequency multiplication relation, use 1/2nd wavelength.Three microstrip filter double-T impedance matching minor matters are carried out
Connecting, the selection of this minor matters width and length is it is required that see the input impedance when frequency range 1 microstrip filter
Being 50Ohm in frequency range 1, the impedance in frequency range 2 and frequency range 3 is close to open circuit, other two frequency filters
The input impedance of ripple device is also required to meet similar relation, and the band of such three wave filter is interior respectively not by other
The band of wave filter is outer to be disturbed, and realizes three frequency ranges with this and all has good transmission characteristic.
In the present invention, quarter-wave resonance device filter centre frequency with the principle of bandwidth Design is: such as Fig. 2
Shown resonator respectively may be about quarter-wave, by changing resonator length, i.e. extends or shortens
The open end of resonator or short-circuit end finely tune the mid frequency of wave filter.The bandwidth Design of wave filter is permissible
Realizing by regulating the spacing between resonator, between resonator, spacing is the least, and the coupling between resonator is more
Tightly, filter bandwidht is the widest.The spacing finely tuned between the length resonator of each resonator can realize filter
The optimization of ripple device band internal characteristic.
The present invention 1/2nd wave resonator filter centre frequency with the principle of bandwidth Design is: such as Fig. 3
Respectively may be about quarter-wave with the resonator shown in Fig. 4, finely tune filtering by changing resonator length
The mid frequency of device.The bandwidth Design of wave filter can realize by regulating the spacing between resonator, humorous
Spacing between device of shaking is the least, and the coupling between resonator is the tightest, and filter bandwidht is the widest.Finely tune each resonator
Spacing between length resonator can realize the optimization to wave filter band internal characteristic.
The principle that wave filter introduces in the present invention transmission zero is: parallel connection one section on the resonator of wave filter
The open circuit minor matters of certain length and width so that it is the input impedance at specific frequency is zero, now, this spy
Determine at frequency, to form a transmission zero.
See Fig. 6, be applied to DCS-1800 up-downgoing for micro-strip triplexer and intercept the triplexer of 900MHz
The frequency response schematic diagram of design, including transmission curve and isolation curve.Micro-strip triplexer of the present invention, tool
There is the advantage that size is less, low cost, flexible design, isolation are good.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (10)
1. a micro-strip triplexer, it is characterised in that including: three microstrip filters, impedance matching minor matters,
Described three microstrip filters are connected with described impedance matching minor matters respectively, and described impedance matching minor matters are provided with sky
Line mouth, described microstrip filter includes resonator, at least one micro-strip filtering in described three microstrip filters
The resonator length of device is the quarter-wave that microstrip filter frequency range mid frequency is corresponding, and other micro-strip are filtered
The resonator length of ripple device is 1/2nd wavelength that microstrip filter frequency range mid frequency is corresponding.
Micro-strip triplexer the most according to claim 1, it is characterised in that described microstrip filter is for sending out
Clip-type wave filter.
Micro-strip triplexer the most according to claim 1, it is characterised in that the feedback of described microstrip filter
Electricity is couple feed or tap feed.
4. according to the micro-strip triplexer described in claim 1 or 2 or 3, it is characterised in that described impedance
Join minor matters and include two T-shaped minor matters of cascade for double T impedance matching minor matters, described pair of T impedance matching minor matters,
Described pair of T impedance matching minor matters are the double T impedance matching minor matters of microstrip line, the double T impedance matching of described microstrip line
Minor matters match with described microstrip filter with straight line or curve form.
5. according to the micro-strip triplexer described in claim 1 or 2 or 3, it is characterised in that one wherein
Or on the resonator of multiple microstrip filter, connecting open circuit minor matters, described open circuit minor matters are the micro-of straight line or curve
Band wire open circuit minor matters.
Micro-strip triplexer the most according to claim 4, it is characterised in that the most one or more micro-
Connecting open circuit minor matters on the resonator of band filter, described open circuit minor matters are the microstrip line open circuit of straight line or curve
Minor matters.
Micro-strip triplexer the most according to claim 1, it is characterised in that described antenna opening is arranged at institute
Stating one end of micro-strip triplexer, the isolated port of described three microstrip filters is respectively arranged at described micro-strip three
The other end of multiplexer.
Micro-strip triplexer the most according to claim 2, it is characterised in that described three microstrip filters
It is respectively the hair clip type filtering of the hair clip type wave filter of frequency range 1, the hair clip type wave filter of frequency range 2, frequency range 3
Device,
The hair clip type wave filter of described frequency range 1 includes four resonators, the hair clip type wave filter of described frequency range 1
Resonator length be the quarter-wave that wave filter frequency range mid frequency is corresponding, each resonator one end is
Open circuit, the other end is short circuit, and short-circuit end is provided with grounding through hole；
The hair clip type wave filter of described frequency range 2 includes three resonators, the hair clip type wave filter of described frequency range 2
Resonator length be 1/2nd wavelength that wave filter frequency range mid frequency is corresponding, the two ends of each resonator
For open circuit；
The hair clip type wave filter of described frequency range 3 includes four resonators, the hair clip type wave filter of described frequency range 3
Resonator length be 1/2nd wavelength that wave filter frequency range mid frequency is corresponding, the two ends of each resonator
For open circuit.
Micro-strip triplexer the most according to claim 8, it is characterised in that
The hair clip type wave filter of described frequency range 2 first and the 3rd resonator be inverted U-shaped resonator, described frequency
Second resonator of the hair clip type wave filter of section 2 is U-shaped resonator, the hair clip type wave filter of described frequency range 2
The second resonator and first open circuit minor matters connect, described first open circuit minor matters be U-shaped microstrip line open circuit branch
Joint, described first open circuit minor matters include the right minor matters of the first open circuit minor matters, first open circuit minor matters left minor matters,
The bottom minor matters of the first open circuit minor matters, the right minor matters of described first open circuit minor matters and the hair clip type of described frequency range 2
Second resonator of wave filter connects, the left minor matters of described first open circuit minor matters and the hair clip type of described frequency range 2
First resonator of wave filter is adjacent, the bottom minor matters of described first open circuit minor matters and the hair clip of described frequency range 2
The open end of the first resonator of mode filter is adjacent,
The hair clip type wave filter of described frequency range 3 first and the 3rd resonator be inverted U-shaped resonator, described frequency
Section 3 hair clip type wave filter second and the 4th resonator be U-shaped resonator, the hair clip type of described frequency range 3
Second resonator of wave filter and the second open circuit minor matters connect, and described second open circuit minor matters are bend font micro-
Band wire open circuit minor matters, the bow font mid portion of described second open circuit minor matters and the hair clip type of described frequency range 3
3rd resonator of wave filter and the 4th resonator are adjacent.
Micro-strip triplexer the most according to claim 8, it is characterised in that described impedance matching minor matters
For double T impedance matching minor matters, described pair of T impedance matching minor matters include two T-shaped minor matters cascaded, respectively
For T1 minor matters and T2 minor matters, described T1 minor matters and T2 minor matters are microstrip line minor matters,
Described T1 minor matters include the lower minor matters of T1, the left minor matters of T1, the right minor matters of T1, and T2 minor matters include
The lower minor matters of T2, the left minor matters of T2, the right minor matters of T2, the lower minor matters of described T1 are provided with antenna opening, described
The left minor matters of T1 are connected with a port of the hair clip type wave filter of described frequency range 1, the right minor matters of described T1
It is connected with minor matters under described T2, an end of the hair clip type wave filter of the left minor matters of described T2 and described frequency range 2
Mouth connects, and the right minor matters of described T2 are connected with a port of the hair clip type wave filter of described frequency range 3, described
The left minor matters of the right minor matters of T1, T2, the right minor matters of T2 are respectively curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210564044.8A CN103887583B (en) | 2012-12-21 | 2012-12-21 | Micro-strip triplexer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210564044.8A CN103887583B (en) | 2012-12-21 | 2012-12-21 | Micro-strip triplexer |
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| Publication Number | Publication Date |
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| CN103887583A CN103887583A (en) | 2014-06-25 |
| CN103887583B true CN103887583B (en) | 2016-09-14 |
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| CN201210564044.8A Expired - Fee Related CN103887583B (en) | 2012-12-21 | 2012-12-21 | Micro-strip triplexer |
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| CN106252872B (en) * | 2016-09-28 | 2023-03-21 | 华南理工大学 | Co-polarized microstrip duplex antenna array |
| CN107732399B (en) * | 2017-10-25 | 2022-07-15 | 上海安费诺永亿通讯电子有限公司 | Ultra-wideband tri-frequency four-port microstrip combiner for wireless mobile communication system |
| CN111313134B (en) * | 2020-02-29 | 2021-09-10 | 西安理工大学 | Enhanced coupling type three-dimensional hairpin filter adopting TSV (through silicon via) technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394090A (en) * | 2001-06-25 | 2003-01-29 | 北京中数威利超导技术有限公司 | Hairpin-type microwave filter |
| TW201041221A (en) * | 2009-05-05 | 2010-11-16 | Univ Nat Chiao Tung | Tri-frequency duplexer circuit and multi-frequency duplexer circuit |
| CN203166051U (en) * | 2012-12-21 | 2013-08-28 | 京信通信系统（中国）有限公司 | Microstrip triplexer |
-
2012
- 2012-12-21 CN CN201210564044.8A patent/CN103887583B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394090A (en) * | 2001-06-25 | 2003-01-29 | 北京中数威利超导技术有限公司 | Hairpin-type microwave filter |
| TW201041221A (en) * | 2009-05-05 | 2010-11-16 | Univ Nat Chiao Tung | Tri-frequency duplexer circuit and multi-frequency duplexer circuit |
| CN203166051U (en) * | 2012-12-21 | 2013-08-28 | 京信通信系统（中国）有限公司 | Microstrip triplexer |
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