CN103268968B - A kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel - Google Patents
A kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel Download PDFInfo
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- CN103268968B CN103268968B CN201310106525.9A CN201310106525A CN103268968B CN 103268968 B CN103268968 B CN 103268968B CN 201310106525 A CN201310106525 A CN 201310106525A CN 103268968 B CN103268968 B CN 103268968B
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- 238000003780 insertion Methods 0.000 abstract description 8
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Abstract
The invention provides a kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel: the first band pass filter and the second band pass filter load mutually, two band pass filters are operated in ultra wide band channel and WLAN (wireless local area network) channel respectively, wherein the first band pass filter adopts the structure be coupled of the structure that be coupled with three lines of open circuit minor matters by the coupling of minor matters of two open circuits and quarter-wave resonance device and short circuit minor matters and minor matters of opening a way, and the second band pass filter employing comes from the mode that load coupling and resonator combine.The present invention has the feature of novel structure, miniaturization, high-isolation, filter with low insertion loss, high selectivity, low cost.
Description
Technical field
The present invention relates to a kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel, belong to the communications field.
Background technology
Traditional duplexer is made up of two band pass filters and match circuit, and match circuit is usually with T-shape knot or " Y " type knot, but the existence of T-shape knot and " Y " type knot but increases micro-strip duplexer size.If adopt common resonant device technology, circuit size is made to be reduced greatly like this, but because two passbands of duplexer are determined with its second harmonic frequency respectively by the fundamental frequency of common resonant device, bring certain difficulty so just to the design of common resonant device.If be connected with public port by two filters and do not adopt matching network, reduce circuit size, but all there is the shortcomings such as isolation is low, Insertion Loss is large in this kind of duplexer.
Summary of the invention
For above-mentioned technical problem, technical problem to be solved by this invention is to provide the isolation of the height without the need to the matching network micro-strip duplexer being applied to ultra wide band channel and WLAN (wireless local area network) of a kind of miniaturization, high isolation.
The present invention adopts following technical scheme for solving the problems of the technologies described above.
A kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel: to be formed at the first band pass filter on pcb board and the second band pass filter, first band pass filter is applied to ultra wide band channel, and the second band pass filter is applied to WLAN (wireless local area network) channel.First band pass filter comprises output open circuit coupling feed, input coupling feed, resonator one, resonator two.Output open circuit coupling feed comprises 50 ohm of output feeders one, short circuit branch line, open circuit coupling feed one.Input coupling feed comprises 50 ohm of incoming feeders, open circuit coupling feed two and short circuit coupling feed one.Second band pass filter comprises output short-circuit coupling feed, resonator two, resonator three, short circuit coupling feed one.Output short-circuit coupling feed comprises 50 ohm of output feeders two and short circuit coupling feed two.Short circuit branch line is coupled with open circuit coupling feed one.Open circuit coupling feed one is coupled with open circuit coupling feed two, and resonator one is coupled with open circuit coupling feed one, and resonator one is coupled with open circuit coupling feed two, the formation three line coupled structure that intercouples of this three.Short circuit coupling feed one and short circuit coupling feed two are coupled in L1 length, and resonator two and resonator three are coupled in L2 length, and the length of L1 and L2 can adjust according to different situations.Short circuit coupling feed one is coupled with resonator two; Short circuit coupling feed two is coupled with resonator three; The length that short circuit coupling feed and resonator are coupled can regulate, and short circuit coupling feed can be coupled with a part for resonator, also can be coupled with whole length of resonator.The length of resonator one, resonator two, resonator three is 1/4th of operation wavelength.
As the further improvement of the technical program, short circuit branch line is not identical with the length of short circuit coupling feed one.
Technique scheme compared with prior art, has following beneficial effect.
1, isolation is high: the transmission zero that this duplexer utilizes the impact of the mutual loading of two band pass filters to introduce realizes very high isolation.The transmission zero that the coupled structure that resonator two and short circuit coupling feed one are formed is introduced can improve the isolation in WLAN (wireless local area network) channel, the transmission zero that the coupled structure that resonator one and open circuit coupling feed two are formed is introduced can improve the isolation in ultra wide band channel, the present invention can be greater than 37.5 decibels by isolation in whole ultra wide band channel, and in whole WLAN (wireless local area network) channel, isolation is greater than 46 decibels.
2, compact conformation: the matching network not needing extra such as T-shape knot, " Y " type knot or public resonator because this duplexer directly connects with public port, so can greatly reduce the additional size that these matching networks bring, thus realized micro-strip duplexer has the feature of compact conformation.
3, He Ne laser performance is high: because short circuit branch line is not identical with the length of short circuit coupling feed one, the position of transmission zero can be regulated, the transmission zero produced is laid respectively near the upper lower limiting frequency of ultra wide band channel, thus the frequency selectivity of ultra wide band channel can be improved.The source that output short-circuit coupling feed and short circuit coupling feed one are formed and load coupling structure can produce a transmission zero at the upper near pass-band of WLAN (wireless local area network), thus make two channels obtain precipitous passband edge, improve the frequency selectivity of duplexer.
4, cost is low: because this filter construction is only made up of the additional upper and lower double layer of metal coating of single-layer medium plate, so very ripe single-layer printed circuit plate (PCB) processing technology at present can be adopted to produce, add the feature of its miniaturization, make whole board dimension less, processing cost is very cheap.
5, be easy to integrated: what adopt due to this filter is microstrip structure, and volume is little, lightweight, is therefore easy to integrated with other circuit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of single-layer printed circuit plate.
Fig. 2 is the schematic diagram of duplexer.
Fig. 3 is the schematic diagram of plated-through hole.
Fig. 4 is emulation and the actual measurement return loss S of duplexer
11, ultra wide band channel insertion loss S
21, WLAN channel insertion loss S
31comparison diagram.
Fig. 5 is emulation and the actual measurement isolation S of duplexer
23comparison diagram.
Fig. 6 is the emulation of duplexer and the group delay comparison diagram of actual measurement ultra wide band channel.
Reference numeral title is as follows: 1, the first band pass filter; 2, the second band pass filter; 3, output open circuit coupling feed; 4, coupling feed is inputted; 5, output short-circuit coupling feed; 6, short circuit branch line; 7, open circuit coupling feed one; 8, open circuit coupling feed two; 9, short circuit coupling feed one; 10, short circuit coupling feed two; 11, resonator one; 12, resonator two; 13, resonator three; 14, plated-through hole; 15, plated-through hole; 16, plated-through hole; 17, plated-through hole; 18, plated-through hole; 19, plated-through hole; 20,50 ohm of output feeders one; 21,50 ohm of incoming feeders; 22,50 ohm of output feeders two; 31, upper metal patch; 32, dielectric substrate; 33, lower metal patch.
Specific embodiments
For sake of convenience, hereinafter alleged " on ", the upper and lower of D score and accompanying drawing itself to consistent, but do not play restriction effect to structure of the present invention.
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme.
The output port of micro-strip duplexer of the present invention and input port with the welding of SMA head, are tested or practical devices to access respectively.The length of resonator is 1/4th of operation wavelength, and is all short-circuit resonant device.
As shown in Figure 1: the present invention adopts relative dielectric constant to be 2.2, thickness be the pcb board of 0.508mm as substrate, the pcb board of other specifications also can be adopted as substrate.Metal patch 31 and lower metal patch 33 is coated with respectively on the upper and lower surface of the dielectric substrate 32 of pcb board.
As shown in Figure 2: output open circuit coupling feed 3 comprises 50 ohm of output feeders 1, short circuit branch line 6, open circuit coupling feed 1, input coupling feed 4 comprises 50 ohm of incoming feeders 21, open circuit coupling feed 28 and short circuit coupling feed 1, and output short-circuit coupling feed 5 comprises 50 ohm of output feeders 2 22 and short circuit coupling feed 2 10.The length of short circuit branch line 6 and the length of short circuit coupling feed 1 unequal.Short circuit branch line 6 is coupled with open circuit coupling feed 1.Open circuit coupling feed 1 and open circuit coupling feed 28 be coupled and resonator 1 and coupling feed 1 of opening a way, coupling feed of opening a way 28 are coupled formation three line coupled structure.Resonator 1 is between open circuit coupling feed 1 and open circuit coupling feed 28.Short circuit coupling feed 1 shape at a right angle can certainly be straight line; Resonator 2 12 is anti-" it " shape, and short circuit coupling feed 1 is coupled with a part for resonator 2 12.Short circuit coupling feed 2 10 shape at a right angle, can certainly be straight line, resonator 3 13 be " it " shape, and short circuit coupling feed 2 10 is coupled with a part for resonator 3 13.Resonator 2 12 resonator 3 13 is coupled in the length of L2, short circuit coupling feed 1 and short circuit coupling feed 2 10 are coupled in the length of L1, the length of L1 and L2 is adjustable, by the degree regulating the length be coupled and the distance be coupled to regulate coupling.Realize being coupled of source and load by this method.The end of short circuit branch line 6, short circuit coupling feed 1, short circuit coupling feed 2 10, resonator 1, resonator 2 12, resonator 3 13 is respectively provided with a plated-through hole.
As shown in Figure 3: corresponding with upper metal patch 31, lower metal patch 33 is also provided with corresponding plated-through hole above, and upper metal patch 31 is connected by plated-through hole with lower metal patch 33.
Fig. 5 is emulation of the present invention and actual measurement return loss S
11, ultra wide band channel insertion loss S
21, WLAN channel insertion loss S
31comparison diagram.The centre frequency of the ultra wide band channel realized is 3GHz, and 3 decibels of relative bandwidths reach 80.3%, and logical in-band insertion loss is less than-1.7 decibels, and return loss is all below-10.3 decibels.The centre frequency of the WLAN channel realized is 5.8GHz, and 3 decibels of relative bandwidths are 3.45%, and logical in-band insertion loss is less than-3 decibels, and clawback loss is all below-13 decibels.Emulation and measured result coincide very well.
As shown in Figure 6, be presented at the group delay of emulation and actual measurement in ultra wide band channel, excursion is between 0.26ns to 0.86ns, and in passband, group delay change is mild.
Claims (2)
1. isolate micro-strip duplexer without the need to matching network with the height of ultra wide band channel for one kind, comprise and be formed at the first band pass filter (1) on pcb board and the second band pass filter (2), it is characterized in that: described first band pass filter comprises output open circuit coupling feed (3), input coupling feed (4), resonator one (11), resonator two (12), described output open circuit coupling feed (3) comprises 50 ohm of output feeders one (20), short circuit branch line (6), open circuit coupling feed one (7), short circuit branch line (6), open circuit coupling feed one (7) is all directly electrically connected with 50 ohm of output feeders one (20), described input coupling feed (4) comprises 50 ohm of incoming feeders (21), open circuit coupling feed two (8) and short circuit coupling feed one (9), open circuit coupling feed two (8), short circuit coupling feed one (9) is all directly electrically connected with 50 ohm of incoming feeders (21), described second band pass filter (2) comprises output short-circuit coupling feed (5), resonator two (12), resonator three (13), short circuit coupling feed one (9), described output short-circuit coupling feed (5) comprises 50 ohm of output feeders two (22) and short circuit coupling feed two (10), 50 ohm of output feeders two (22) and short circuit coupling feed two (10) are directly electrically connected, resonator one (11) is positioned between open circuit coupling feed one (7) and open circuit coupling feed two (8), short circuit branch line (6) is coupled with open circuit coupling feed one (7), resonator one (11) and open circuit coupling feed one (7), open circuit coupling feed two (8) forms three line coupled structures, short circuit coupling feed one (9) and resonator two (12) are coupled, short circuit coupling feed two (10) and resonator three (13) are coupled, short circuit coupling feed one (9) and short circuit coupling feed two (10) are coupled in L1 length, resonator two (12) and resonator three (13) are coupled in L2 length, region residing for L1 length is different from the region residing for L2 length, resonator one (11), resonator two (12), the length of resonator three (13) is 1/4th of operation wavelength.
2. duplexer according to claim 1, is characterized in that: short circuit branch line (6) is not identical with the length of short circuit coupling feed one (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310106525.9A CN103268968B (en) | 2013-03-28 | 2013-03-28 | A kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel |
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| CN201310106525.9A CN103268968B (en) | 2013-03-28 | 2013-03-28 | A kind of without the need to the height isolation micro-strip duplexer of matching network with ultra wide band channel |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103633400B (en) * | 2013-11-19 | 2016-04-13 | 华南理工大学 | A kind of micro-strip duplexer based on electromagnetism hybrid coupled |
| CN103811833B (en) * | 2014-02-20 | 2016-04-13 | 南京航空航天大学 | Be applied to the height isolation line of rabbet joint duplexer of ultra wide band channel and narrowband channels |
| CN104134836B (en) * | 2014-07-21 | 2016-05-04 | 华南理工大学 | A kind of plane duplexer based on quarter-wave short-circuited feeder |
| CN104681900B (en) * | 2015-03-06 | 2017-08-25 | 西安电子科技大学 | The high-isolation duplexer of electromagnetism branch coupling |
| CN106450600B (en) * | 2016-07-31 | 2020-01-14 | 华南理工大学 | Steep plane duplexer of sideband based on band-pass band elimination mixed structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202076392U (en) * | 2011-04-26 | 2011-12-14 | 南京航空航天大学 | Ultra wideband filter |
| CN202523822U (en) * | 2012-02-29 | 2012-11-07 | 南京航空航天大学 | Double-frequency band pass filter |
| CN203225323U (en) * | 2013-03-28 | 2013-10-02 | 南京航空航天大学 | High-isolation microstrip diplexer provided with ultra wide band channel and needing no coupled network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130049892A1 (en) * | 2011-08-23 | 2013-02-28 | Mesaplexx Pty Ltd | Filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202076392U (en) * | 2011-04-26 | 2011-12-14 | 南京航空航天大学 | Ultra wideband filter |
| CN202523822U (en) * | 2012-02-29 | 2012-11-07 | 南京航空航天大学 | Double-frequency band pass filter |
| CN203225323U (en) * | 2013-03-28 | 2013-10-02 | 南京航空航天大学 | High-isolation microstrip diplexer provided with ultra wide band channel and needing no coupled network |
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