CN203883094U - Micro-strip diplexer based on electromagnetic mixed coupling - Google Patents
Micro-strip diplexer based on electromagnetic mixed coupling Download PDFInfo
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- CN203883094U CN203883094U CN201320733247.5U CN201320733247U CN203883094U CN 203883094 U CN203883094 U CN 203883094U CN 201320733247 U CN201320733247 U CN 201320733247U CN 203883094 U CN203883094 U CN 203883094U
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Abstract
The utility model discloses a micro-strip diplexer based on electromagnetic mixed coupling, and the diplexer comprises a double-faced copper-wrapped micro-strip plate. One surface of the micro-strip plate is provided with two filters with controllable band-pass frequencies and bandwidths, a first port feeder line, a second port feeder line, a T-shaped joint, a first port, a second port, and a third port. The other surface of the micro-strip plate is provided with a copper-wrapped ground plate. Each filter mainly consists of three mutually-coupled quarter-wavelength micro-strip resonators. The joint of one ends of three resonators is provided with a grounding through hole. Electric coupling is formed between two adjacent micro-strip resonators in each filter. On the basis of the original electromagnetic coupling, the electric coupling is introduced, thereby achieving the flexible change of the bandwidth of the diplexer through adjusting the strengths of the electromagnetic coupling and the electric coupling. Moreover, the improved filters can generate a plurality of transmission zero points near high and lower cut-off frequencies, thereby reducing the mutual impact of the two filters through adjusting the positions of the zero points.
Description
Technical field
The utility model relates to the technical field of Frequency Division Duplexing (FDD), refers in particular to a kind of micro-strip duplexer based on electromagnetism hybrid coupled.
Background technology
Due to the high speed development of radio communication in recent years, be no matter the burning hot or arrival of 4G of universal, the Internet of Things of 3G technology, all indicate that wireless technology will welcome a flourish peak period again.Wireless communication system of today, substantially be all duplexing system, for time division duplex, as long as will receive and be arranged in different timeslices and just can deal with problems, and for Frequency Division Duplexing (FDD), in order to reduce the quantity of antenna, need to design special device and make the electromagnetic wave of different frequency share common antenna and not cause mutually interference, such device is exactly duplexer.And miniaturization, cost are low, the duplexer of low-loss, high-isolation also becomes one of study hotspot in recent years.
At present, conventional duplexer type has: waveguide duplexer, coaxial duplexer, dielectric duplexer, SAW duplexer.These duplexers respectively have pluses and minuses, and such as the time of waveguide duplexer application is also the most ripe at most, its loss is low, operating frequency is high, but volume is large, cost is high, tuning difficulty; Dielectric loss and the ohmic loss of coaxial duplexer are all very little, and stability is high, shielding is good, but in mobile communication frequency domain, it is too large that its volume still seems; Although dielectric duplexer has been realized the miniaturization of duplexer, cost is too high; SAW duplexer can be realized the frequency characteristic of arbitrary accuracy, and volume is little, design flexibility is good, reliability is high, but that weak point is cost is high, loss large, high frequency bears power is low.
Nowadays the development of mobile communication technology, frequency spectrum resource is more and more deficienter.Madness growth along with portable mobile wireless electronics product, miniaturization, cost are low, high frequency change into for the mark of duplexer research to, and micro-strip duplexer just in time can meet these requirements, and the duplexer of satisfactory texture can also meet compared with the requirement of low-loss and high isolation degree.
It is first to design two band pass filters that are positioned at low-frequency range and high band that current micro-strip duplexer is relatively commonly used also method for designing eaily, then with T connector, the band pass filter of these two different center frequency is coupled together, again by the impact of adjusting the coupling of each port and revising two filters and the mutual coupling bringing being connected of T connector, make the performance of micro-strip duplexer can reach the index of expection.Up to the present, the coupled modes of modal micro-strip duplexer the inside are electric coupling.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of combination property micro-strip duplexer based on electromagnetism hybrid coupled is preferably provided, there is selectivity more flexibly, can meet that miniaturization, low cost, filtering characteristic are good, high-isolation, there is the passband designing requirement of controllability duplexer on a large scale.
For achieving the above object, technical scheme provided by the utility model is: a kind of micro-strip duplexer based on electromagnetism hybrid coupled, comprise the micro-band plate of double-sided copper-clad, on the same face of the micro-band plate of described double-sided copper-clad, be manufactured with respectively two band connection frequencies and the controlled filter of bandwidth, the first port feeder line, the second port feeder line, T connector, for transmitting the first port of mixing electromagnetic wave signal, the second port for carry high frequency section electromagnetic wave signal, for transmitting the 3rd port of low-frequency range electromagnetic wave signal, the another side of the micro-band plate of this double-sided copper-clad is for covering copper ground plate, wherein, described T connector vicinity is arranged between two filters, and longitudinal feeder line of this T connector is connected with the first port, described the first port feeder line vicinity is arranged on by the opposite side of the relative T connector of a filter wherein, between one horizontal feeder line termination of one end of this first port feeder line and described T connector, there is coupling gap, can introduce source load coupling, its other end is connected with the 3rd port, described the second port feeder line vicinity is arranged on by the opposite side of the relative T connector of another filter, between another horizontal feeder line termination of one end of this second port feeder line and described T connector, there is coupling gap, can introduce source load coupling, its other end is connected with the second port, described two filters are all mainly comprised of three quarter-wave micro-strip resonantors that intercouple, one end of described three micro-strip resonantors interconnects, and there is grounding through hole in junction, side by side, and there is electric coupling between adjacent two micro-strip resonantors in three micro-strip resonantor intervals in each filter, the grounding through hole of described two filters can with scolding tin with cover copper ground plate and be connected, and become short-circuit end after connecting, and for introducing separately magnetic coupling between micro-strip resonantor.
Described the first port, the second port, the 3rd port are the matched impedance of 50 ohm.
In each filter, micro-strip resonantor in the middle of being positioned at is parallel to longitudinal feeder line of T connector, the micro-strip resonantor that is positioned at both sides forms by four micro-bands, two longitudinal feeder lines that are parallel to T connector wherein, two other is perpendicular to longitudinal feeder line of T connector, and one end of described two micro-bands that are parallel to the longitudinal feeder line of T connector connects by a micro-band perpendicular to the longitudinal feeder line of T connector wherein; In described two micro-bands that are parallel to the longitudinal feeder line of T connector, shorter micro-band is near that micro-strip resonantor in the middle of being positioned at, the other end of long micro-band is connected in another perpendicular to micro-band of the longitudinal feeder line of T connector, and this micro-band is connected with the micro-strip resonantor in the middle of being positioned at.
Described the first port feeder line, T connector, wherein between the grounding through hole of a filter, remain with headspace, between the grounding through hole of described the second port feeder line, T connector, another filter, remain with headspace.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, by introducing source load coupling and electromagnetism hybrid coupled, make filter produce a plurality of transmission zeros, the frequency location of reasonably adjusting these transmission zeros can make whole duplexer obtain very high isolation;
2, between resonator, adopt the mode of electromagnetism hybrid coupled that the bandwidth of duplexer can be controlled on a large scale, add and can change by adjusting the length of resonator the centre frequency of two band pass filters, therefore, micro-strip duplexer of the present utility model can adapt to plurality of communication systems very neatly;
3, the duplexer of this structure has compared with low insertion loss, is with outer selectivity good, the feature that filtering characteristic is good;
4, because duplexer is microstrip structure, lightweight, cost is low, be applicable to industrial mass manufacture, so duplexer possess simple in structure, design advantage easy, cheap for manufacturing cost.
Accompanying drawing explanation
Fig. 1 is micro-strip duplexer schematic diagram of the present utility model.
Fig. 2 is the scattering parameter simulation result figure of micro-strip duplexer of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
Shown in Figure 1, the micro-strip duplexer based on electromagnetism hybrid coupled described in the present embodiment, comprise the micro-band plate 1 of double-sided copper-clad, on the same face of the micro-band plate 1 of described double-sided copper-clad, be manufactured with respectively two band connection frequencies and the controlled filter of bandwidth, the first port feeder line 12, the second port feeder line 4, T connector 8, for transmitting the first port Port1 of mixing electromagnetic wave signal, the second port Port2 for carry high frequency section electromagnetic wave signal, for transmitting the 3rd port Port3 of low-frequency range electromagnetic wave signal, the another side of the micro-band plate 1 of this double-sided copper-clad is for covering copper ground plate, wherein, contiguous being arranged between two filters of described T connector 8, longitudinal feeder line of this T connector 8 is connected with the first port Port1, described the first port feeder line 12 is contiguous to be arranged on by the opposite side of the relative T connector 8 of a filter wherein, between one horizontal feeder line termination of one end of this first port feeder line 12 and described T connector 8, there is coupling gap 9, can introduce source load coupling, to obtain the outer selectivity of better band, the other end of this first port feeder line 12 is connected with the 3rd port Port3, described the second port feeder line 4 vicinities are arranged on by the opposite side of the relative T connector 8 of another filter, between another horizontal feeder line termination of one end of this second port feeder line 4 and described T connector 8, there is coupling gap 7, can introduce source load coupling, to obtain the outer selectivity of better band, the other end of this second port feeder line 4 is connected with the second port Port2, described the first port Port1, the second port Port2, the 3rd port Port3 are the matched impedance of 50 ohm.
Described two filters are all mainly comprised of three quarter-wave micro-strip resonantors that intercouple, specifically as shown in Figure 1, wherein a filter includes micro-strip resonantor 13, 14, 15, and another filter includes micro-strip resonantor 2, 3, 16, described three micro-strip resonantors 13, 14, one end of 15 interconnects, and in junction, there is grounding through hole 11, described three micro-strip resonantors 2, 3, one end of 16 interconnects, and in junction, there is grounding through hole 5, three micro-strip resonantor intervals in each filter side by side, and there is electric coupling between adjacent two micro-strip resonantors, in each filter, micro-strip resonantor in the middle of being positioned at is parallel to longitudinal feeder line of T connector 8, the micro-strip resonantor that is positioned at both sides forms by four micro-bands, two longitudinal feeder lines that are parallel to T connector 8 wherein, two other is perpendicular to longitudinal feeder line of T connector 8, one end of described two micro-bands that are parallel to T connector 8 longitudinal feeder lines connects by a micro-band perpendicular to T connector 8 longitudinal feeder lines wherein, in described two micro-bands that are parallel to T connector 8 longitudinal feeder lines, shorter micro-band is near that micro-strip resonantor in the middle of being positioned at, the other end of long micro-band is connected in another perpendicular to micro-band of T connector 8 longitudinal feeder lines, and this micro-band is connected with the micro-strip resonantor in the middle of being positioned at.By adjusting electric coupling and the magnetic coupling between micro-strip resonantor, the bandwidth of each filter can regulate in very wide scope; By introducing source coupling, can produce two transmission zeros in the passband both sides of each filter, greatly improve the Out-of-band rejection of duplexer.
Described grounding through hole 11 and grounding through hole 5 can with scolding tin with cover copper ground plate and be connected, and become short-circuit end after connecting, two filters described in the present embodiment by corresponding grounding through hole with cover copper ground plate and be connected, for introducing separately magnetic coupling between micro-strip resonantor.
In addition, in order to facilitate welding connecting hole, and prevent micro-strip resonantor and feeder line short circuit, the first port feeder line 12 described in the present embodiment, T connector 8, wherein between the grounding through hole 11 of a filter, remain with headspace 10, between the grounding through hole 5 of described the second port feeder line 4, T connector 8, another filter, remain with headspace 6.
Shown in Figure 2, shown the scattering parameter simulation result of this micro-strip duplexer, its centre frequency is respectively 1.8Ghz and 2.4Ghz.Transverse axis represents the signal frequency of this micro-strip duplexer, and the longitudinal axis represents amplitude, comprises insertion loss (S
12, S
13) amplitude, return loss (S
11, S
22, S
33) amplitude and isolation (S
23) amplitude, S wherein
11the return loss that represents port1, S
22the return loss that represents port2, S
33the return loss that represents port3, S
12the insertion loss that represents port1 and port3, S
13the insertion loss that represents port1 and port3.Insertion loss represents the relation between the input power of a signal and the power output of another port signal, and its corresponding mathematical function is: power output/input power (dB)=20*log|S
21|.Return loss represents the relation between the input power of this port signal and the reflection power of signal, and its corresponding mathematical function is as follows: reflection power/incident power==20*log|S
11|.
As we know from the figure, in the passband of 1.8Ghz, return loss | S
11| and S
33absolute value be greater than 20DB, insertion loss S
13absolute value be less than 1.5DB, in the passband of 2.4Ghz, return loss S
11and S
22absolute value be greater than 20DB, insertion loss S
12absolute value be less than 1.5DB.From the frequency range of 0-4Ghz, the isolation S of this micro-strip duplexer
23absolute value be greater than 40DB.In addition, this micro-strip duplexer each passband both sides can produce several transmission zeros, greatly improved Out-of-band rejection.
After adopting above scheme, the utility model is on original magnetic coupling basis, between micro-strip resonantor, introduced electric coupling, make by regulating the intensity of magnetic coupling and electric coupling can change very neatly the bandwidth of duplexer, and the filter after improving can produce several transmission zeros near upper lower limiting frequency, make can reduce influencing each other of two filters by adjusting the position at these zero points, and then improve the isolation of whole duplexer.This compared to existing technology, the utility model is the good micro-strip duplexer of a combination property, can effectively overcome the poor difficulty of existing micro-strip duplexer filtering characteristic, there is selectivity more flexibly, can meet that miniaturization, low cost, filtering characteristic are good, the controlled designing requirement on a large scale of high-isolation, passband, be worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the utility model, not with this, limit practical range of the present utility model, therefore the variation that all shapes according to the utility model, principle are done all should be encompassed in protection range of the present utility model.
Claims (4)
1. the micro-strip duplexer based on electromagnetism hybrid coupled, comprise the micro-band plate of double-sided copper-clad (1), it is characterized in that: on the same face of the micro-band plate of described double-sided copper-clad (1), be manufactured with respectively two band connection frequencies and the controlled filter of bandwidth, the first port feeder line (12), the second port feeder line (4), T connector (8), for transmitting first port (Port1) of mixing electromagnetic wave signal, the second port (Port2) for carry high frequency section electromagnetic wave signal, for transmitting the 3rd port (Port3) of low-frequency range electromagnetic wave signal, the another side of the micro-band plate of this double-sided copper-clad (1) is for covering copper ground plate, wherein, described T connector (8) is contiguous to be arranged between two filters, and longitudinal feeder line of this T connector (8) is connected with the first port (Port1), described the first port feeder line (12) is contiguous to be arranged on by the opposite side of the relative T connector of a filter (8) wherein, between one horizontal feeder line termination of one end of this first port feeder line (12) and described T connector (8), there is coupling gap (9), can introduce source load coupling, its other end is connected with the 3rd port (Port3), described the second port feeder line (4) is contiguous to be arranged on by the opposite side of the relative T connector of another filter (8), between another horizontal feeder line termination of one end of this second port feeder line (4) and described T connector (8), there is coupling gap (7), can introduce source load coupling, its other end is connected with the second port (Port2), described two filters are all mainly comprised of three quarter-wave micro-strip resonantors that intercouple, one end of described three micro-strip resonantors interconnects, and there is grounding through hole in junction, side by side, and there is electric coupling between adjacent two micro-strip resonantors in three micro-strip resonantor intervals in each filter, the grounding through hole of described two filters can with scolding tin with cover copper ground plate and be connected, and become short-circuit end after connecting, and for introducing separately magnetic coupling between micro-strip resonantor.
2. a kind of micro-strip duplexer based on electromagnetism hybrid coupled according to claim 1, is characterized in that: described the first port (Port1), the second port (Port2), the 3rd port (Port3) are the matched impedance of 50 ohm.
3. a kind of micro-strip duplexer based on electromagnetism hybrid coupled according to claim 1, it is characterized in that: in each filter, micro-strip resonantor in the middle of being positioned at is parallel to longitudinal feeder line of T connector (8), the micro-strip resonantor that is positioned at both sides forms by four micro-bands, two longitudinal feeder lines that are parallel to T connector (8) wherein, two other is perpendicular to longitudinal feeder line of T connector (8), and a wherein micro-band connection perpendicular to the longitudinal feeder line of T connector (8) is passed through in described two one end that are parallel to micro-band of the longitudinal feeder line of T connector (8); The described T connector (8) that is parallel to is longitudinally in two micro-bands of feeder line, shorter micro-band is near that micro-strip resonantor in the middle of being positioned at, the other end of long micro-band is connected in another perpendicular to micro-band of the longitudinal feeder line of T connector (8), and this micro-band is connected with the micro-strip resonantor in the middle of being positioned at.
4. a kind of micro-strip duplexer based on electromagnetism hybrid coupled according to claim 1, it is characterized in that: described the first port feeder line (12), T connector (8), wherein between the grounding through hole of a filter (11), remain with headspace (10), between the grounding through hole (5) of described the second port feeder line (4), T connector (8), another filter, remain with headspace (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320733247.5U CN203883094U (en) | 2013-11-19 | 2013-11-19 | Micro-strip diplexer based on electromagnetic mixed coupling |
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| CN201320733247.5U CN203883094U (en) | 2013-11-19 | 2013-11-19 | Micro-strip diplexer based on electromagnetic mixed coupling |
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Cited By (2)
| 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 |
| TWI612718B (en) * | 2016-04-27 | 2018-01-21 | 啟碁科技股份有限公司 | Diplexer |
-
2013
- 2013-11-19 CN CN201320733247.5U patent/CN203883094U/en not_active Withdrawn - After Issue
Cited By (3)
| 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 |
| TWI612718B (en) * | 2016-04-27 | 2018-01-21 | 啟碁科技股份有限公司 | Diplexer |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141015 Effective date of abandoning: 20160413 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |