CN103268968A - High-isolation microstrip duplexer with ultra wide band channel and without matching network - Google Patents
High-isolation microstrip duplexer with ultra wide band channel and without matching network Download PDFInfo
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- CN103268968A CN103268968A CN2013101065259A CN201310106525A CN103268968A CN 103268968 A CN103268968 A CN 103268968A CN 2013101065259 A CN2013101065259 A CN 2013101065259A CN 201310106525 A CN201310106525 A CN 201310106525A CN 103268968 A CN103268968 A CN 103268968A
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Abstract
The invention provides a high-isolation microstrip duplexer with an ultra wide band channel and without matching network. A first band pass filter and a second band pass filter are mutually loaded, and the two band pass filters respectively operate in the ultra wide band channel and a wireless local area network channel, wherein the first band pass filter adopts the structure of the coupling of two open circuit stubs, the three-line coupling of quarter-wavelength resonator and an open circuit stub, and the structure of the coupling of a short-circuited stub and an open circuit stub; and the second band pass filter adopts the combination of load coupling and resonator coupling. The high-isolation microstrip duplexer with the a wide band channel and without matching network has the characteristics of novel structure, miniaturization, high isolation, low insertion loss, high selectivity and low cost.
Description
Technical field
The present invention relates to a kind of height isolation micro-strip duplexer that matching network has the ultra broadband channel that need not, belong to the communications field.
Background technology
Traditional duplexer is made 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 has but increased the micro-strip duplexer size.If adopt common resonant device technology, make that like this circuit size is reduced greatly, but owing to two passbands of duplexer are determined respectively by the fundamental frequency of common resonant device and its second harmonic frequency, bring certain difficulty with regard to the design of giving the common resonant device like this.If two filters are connected with public port and do not adopt matching network, reduced circuit size, but all there are shortcomings such as isolation is low, Insertion Loss is big in this class duplexer.
Summary of the invention
At above-mentioned technical problem, technical problem to be solved by this invention provides a kind of miniaturization, the high height that need not matching network that is applied to ultra broadband channel and WLAN (wireless local area network) of isolating is isolated micro-strip duplexer.
The present invention adopts following technical scheme for solving the problems of the technologies described above.
A kind ofly need not the height that matching network has the ultra broadband channel and isolate micro-strip duplexer: be formed at first band pass filter and second band pass filter on the pcb board, first band pass filter is applied to the ultra broadband channel, and second band pass filter is applied to the WLAN (wireless local area network) channel.First band pass filter comprises output open circuit coupling feed, input coupling feed, resonator one, resonator two.The output open circuit coupling feed comprises 50 ohm of output feeders one, short circuit branch line, open circuit coupling feed one.The 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.The output short-circuit coupling feed comprises 50 ohm of output feeders two and short circuit coupling feed two.The short circuit branch line is coupled with open circuit coupling feed one.The coupling of open circuit coupling feed one and open circuit coupling feed two, resonator one is coupled with open circuit coupling feed one, and resonator one is coupled with the coupling feed two of opening a way, and intercoupling of this three forms three line coupled structures.Short circuit coupling feed one and short circuit coupling feed two are coupled in L1 length, and resonator two is coupled in L2 length with resonator three, and the length of L1 and L2 can be adjusted 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 be regulated, and the short circuit coupling feed can be coupled with the part of 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, the length of short circuit branch line and short circuit coupling feed one is inequality.
Technique scheme compared with prior art has following beneficial effect.
1, isolation height: the transmission zero that this duplexer utilizes the influence 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 constitute is introduced can improve the isolation in the WLAN (wireless local area network) channel, the transmission zero that the coupled structure that resonator one and open circuit coupling feed two constitute is introduced can improve the isolation in the ultra broadband channel, the present invention can isolation be greater than 37.5 decibels in whole ultra broadband channel, and isolation is greater than 46 decibels in whole WLAN (wireless local area network) channel.
2, compact conformation: the matching network that does not need extra for example T-shape knot, " Y " type knot or public resonator because this duplexer directly connects with public port, so can significantly reduce the additional size that these matching networks bring, thereby the micro-strip duplexer of realizing has the characteristics of compact conformation.
3, frequency selectivity can be high: because the length of short circuit branch line and short circuit coupling feed one is inequality, can regulate the position of transmission zero, make the transmission zero that produces lay respectively near the last lower limiting frequency of ultra broadband channel, thereby can improve the frequency selectivity of ultra broadband channel.Source and load coupled structure that output short-circuit coupling feed and short circuit coupling feed one constitute can produce a transmission zero near passband on the WLAN (wireless local area network), thereby make two channels obtain precipitous passband edge, improved the frequency selectivity of duplexer.
4, cost is low: because this filter construction only adds upper and lower double layer of metal coating by the single-layer medium plate and constitutes, so can adopt present very ripe single-layer printed circuit plate (PCB) processing technology produces, add the characteristics of its miniaturization, make that whole board dimension is littler, processing cost is very cheap.
5, be easy to integrated: be microstrip structure because this filter adopts, volume is little, and is in light weight, therefore is easy to other circuit integrated.
Description of drawings
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, the ultra broadband channel inserts loss S
21, the WLAN channel inserts 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 broadband channel.
The Reference numeral title is as follows: 1, first band pass filter; 2, second band pass filter; 3, output open circuit coupling feed; 4, input coupling feed; 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, go up metal patch; 32, dielectric substrate; 33, following metal patch.
Specific embodiments
For sake of convenience, hereinafter alleged " on ", the upper and lower of D score and accompanying drawing itself is to consistent, but structure of the present invention do not played the restriction effect.
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 are respectively with the welding of SMA head, in order to insert test or practical devices.The length of resonator is 1/4th of operation wavelength, and all is the short circuit resonator.
As shown in Figure 1: it is 2.2 that the present invention adopts relative dielectric constant, thickness be the pcb board of 0.508mm as substrate, also can adopt the pcb board of other specifications as substrate.Be coated with metal patch 31 and following metal patch 33 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 the length of short circuit branch line 6 and short circuit coupling feed 1 is unequal.Short circuit branch line 6 is coupled with open circuit coupling feed 1.Open circuit coupling feed 1 is coupled with coupling and the resonator 1 of open circuit coupling feed 28 and the coupling feed 1 of opening a way, open circuit coupling feed 28 and forms three line coupled structures.Resonator 1 is between open circuit coupling feed 1 and open circuit coupling feed 28.Short circuit coupling feed 1 shape that meets at right angles can certainly be straight line; Resonator 2 12 is anti-" it " shape, and short circuit coupling feed 1 is coupled with the part of resonator 2 12.Short circuit coupling feed 2 10 shape that meets at right angles can certainly be straight line, and resonator 3 13 is " it " shape, and short circuit coupling feed 2 10 is coupled with the part of resonator 3 13.Resonator 2 12 resonator 3 13 are 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, the degree that the length that is coupled by adjusting and the distance that is coupled are regulated coupling.Come the coupling of realization 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 respectively is provided with a plated-through hole.
As shown in Figure 3: corresponding with last metal patch 31, also be provided with corresponding plated-through hole above the following metal patch 33, last metal patch 31 and following metal patch 33 are connected by plated-through hole.
Fig. 5 is emulation of the present invention and actual measurement return loss S
11, the ultra broadband channel inserts loss S
21, the WLAN channel inserts loss S
31Comparison diagram.The centre frequency of the ultra broadband channel of realizing 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 of realizing is 5.8GHz, and 3 decibels of relative bandwidths are 3.45%, and logical in-band insertion loss is less than-3 decibels, and the clawback loss is all below-13 decibels.Emulation and measured result coincide fine.
As shown in Figure 6, be presented at the group delay of the interior emulation of ultra broadband channel and actual measurement, between the 0.86ns, group delay changes mild excursion in passband at 0.26ns.
Claims (2)
1. one kind need not the height isolation micro-strip duplexer that matching network has the ultra broadband channel, comprise first band pass filter (1) and second band pass filter (2) that are formed on the pcb board, 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), 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), 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), 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) constitutes three line coupled structures, short circuit coupling feed one (9) is coupled with resonator two (12), short circuit coupling feed two (10) is coupled with resonator three (13), 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 resonator one (11) in L2 length, 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 inequality 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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| CN103268968B CN103268968B (en) | 2015-10-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| CN103811833A (en) * | 2014-02-20 | 2014-05-21 | 南京航空航天大学 | High isolation slot line duplexer applied to ultra-wideband channel and narrow-band channel |
| CN104134836A (en) * | 2014-07-21 | 2014-11-05 | 华南理工大学 | Planar duplexer based on quarter-wavelength short circuit feeder |
| CN104681900A (en) * | 2015-03-06 | 2015-06-03 | 西安电子科技大学 | High-isolation duplexer with coupled electromagnetic shunt |
| CN106450600A (en) * | 2016-07-31 | 2017-02-22 | 华南理工大学 | Sideband steep plane duplexer based on band-pass band-elimination hybrid structure |
| CN108183293A (en) * | 2017-12-11 | 2018-06-19 | 南京理工大学 | Plane micro-strip duplexer |
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| 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 |
| US20130049890A1 (en) * | 2011-08-23 | 2013-02-28 | Mesaplexx Pty Ltd | Multi-mode 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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2013
- 2013-03-28 CN CN201310106525.9A patent/CN103268968B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| US20130049890A1 (en) * | 2011-08-23 | 2013-02-28 | Mesaplexx Pty Ltd | Multi-mode 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 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633400A (en) * | 2013-11-19 | 2014-03-12 | 华南理工大学 | Electromagnetic hybrid coupling-based micro-strip duplexer |
| 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 |
| CN103811833A (en) * | 2014-02-20 | 2014-05-21 | 南京航空航天大学 | High isolation slot line duplexer applied to ultra-wideband channel and narrow-band channel |
| 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 |
| CN104134836A (en) * | 2014-07-21 | 2014-11-05 | 华南理工大学 | Planar duplexer based on quarter-wavelength short circuit feeder |
| CN104681900A (en) * | 2015-03-06 | 2015-06-03 | 西安电子科技大学 | High-isolation duplexer with coupled electromagnetic shunt |
| CN104681900B (en) * | 2015-03-06 | 2017-08-25 | 西安电子科技大学 | The high-isolation duplexer of electromagnetism branch coupling |
| CN106450600A (en) * | 2016-07-31 | 2017-02-22 | 华南理工大学 | Sideband steep plane duplexer based on band-pass band-elimination hybrid structure |
| 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 |
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