CN104134866A - Microwave broadband decoupled network based on signal interference concept - Google Patents
Microwave broadband decoupled network based on signal interference concept Download PDFInfo
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- CN104134866A CN104134866A CN201410370581.8A CN201410370581A CN104134866A CN 104134866 A CN104134866 A CN 104134866A CN 201410370581 A CN201410370581 A CN 201410370581A CN 104134866 A CN104134866 A CN 104134866A
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Abstract
The invention provides a microwave broadband decoupled network based on a signal interference concept. According to the structure, removal of mutual coupling between coupled antennas serves as a design starting point, according to a signal interference method, two same broadband directional couplers are connected to serve as a guide-in path, mutual coupling energy of the antennas and energy of the guide-in path generate voltage zero points on a connecting line and then are offset, and therefore the broadband decoupled network is obtained. The decoupled network is of a plane micro-strip structure, and a dielectric slab is made of FR4. With the cooperation of thin film chip resistors, the structure is simple, machining is easy, cost and weight are low, and therefore large-scale production can be achieved. A novel technical scheme is provided for front end design of a broadband receiving and transmitting system, and the combination modes of microwave passive circuits are increased.
Description
Technical field
The present invention relates to a kind of for removing the microwave planar circuit, particularly a kind of microwave broadband decoupling network based on coupler of mutual coupling between the aerial array of closely placing.
Background technology
The progress that next generation communication system is obtained, has excited the urgent demand to the portable and compact terminal of channel capacity and throughput.For improving the channel capacity of communication system, according to Shannon theorem, a method is to widen system bandwidth, and this is applied to third generation mobile; Another method is to use multiple-input and multiple-output (MIMO) technology, and this technology all uses a plurality of antennas to improve channel capacity at transmitting terminal and receiving terminal.Therefore, following high power capacity mobile terminal needs compact broadband multiaerial system.For portable terminal device, a plurality of antennas will be placed in a very little space, and therefore, the spacing between antenna is much smaller than half wavelength.Limited spatial distribution has not only increased spatial coherence, and causes the strong mutual coupling between antenna.High spatial coherence will reduce channel capacity, and strong mutual coupling meeting reduces radiant power, thereby reduce signal to noise ratio, also therefore reduce channel capacity.
For realizing the multiaerial system of compact dimensions and guaranteeing rational channel capacity, need effectively to remove coupling technique.In the numerous technology that propose, there are two kinds of technology attracted attention by people, below this is briefly described.Different according to its mechanism of action, the research of decoupling method is mainly divided into two large classes: a kind of is array decomposition method based on pattern.It utilizes a Mode Decomposition network to come decorrelation to be present in the different mode of compact array.This method has systematicness, and is easily extended in theory the antenna element of arbitrary number.But the coupling bandwidth of some pattern and efficiency can be inconsistent with other patterns; Another is exactly between coupled antenna, to insert passive component.These elements can adopt multi-form, comprising: imaginary loading, artificial structure and lamped element.The limitation of first form is to finely tune to meet design objective to coupled antenna.For second, need to be in the structure of ground-plane design complexity.The shortcoming of lump decoupling network is self relatively narrow decoupling bandwidth, and this is because lamped element has the characteristic of frequency dependence.
From the above, the implementation method of prior art is difficult to be applied to broad-band antenna, and the impact of antenna pattern is not provided to corresponding explanation.
Summary of the invention
Technical problem solved by the invention is to provide a kind of microwave broadband decoupling network that disturbs concept based on signal, and it can remove the mutual coupling between aerial array in wide-band.
The technical solution that realizes the object of the invention is: a kind of microwave broadband decoupling network that disturbs concept based on signal, comprises broadband coupling slot wire antenna, two symmetrical broadband branch line directional couplers, micro-band connecting line, medium substrate, plated-through hole and Chip-Rs;
The upper surface of medium substrate is printed two symmetrical broadband branch line directional couplers, the lower surface of medium substrate is printed broadband coupling slot wire antenna, the unit of described broadband coupling slot wire antenna is two, each broadband branch line directional coupler includes straightthrough port, coupling aperture and isolated port, wherein straightthrough port is connected with corresponding broadband coupling slot wire antenna element by the plated-through hole on medium substrate, carry out energy transition, two symmetrical coupling apertures are connected by micro-band connecting line, isolated port is connected with the ground metallization through hole on medium substrate by Chip-R, described Chip-R is also arranged on the upper surface of medium substrate.
Described each broadband coupling slot wire antenna element includes open end, short-circuit end and the line of rabbet joint, and wherein open end is connected with short-circuit end by the line of rabbet joint, and described open end is plane horn shape, and short-circuit end is sector structure; Two unit center distances are 0.5 λ
0-0.75 λ
0, λ
0for the wavelength in free space.
The dielectric constant of medium substrate is 2.2,3.8,4.4 or 10.2.The thickness of medium substrate is 0.5mm, 0.8mm, 1.0mm or 1.6mm.The material of medium substrate is FR4, and its effective dielectric constant is 4.3～4.4, and thickness is 0.8mm.
Compared with prior art, its remarkable advantage is in the present invention: 1) the microwave broadband decoupling network based on signal interference concept of the present invention can be for high-order or broadband decoupling; 2) the microwave broadband decoupling network based on signal interference concept of the present invention can be realized decoupling based on existing filter or coupler design theory; 3) the microwave broadband decoupling network based on signal interference concept of the present invention can improve antenna pattern.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is signal interference principle figure of the present invention.
Fig. 2 disturbs the top view of the microwave broadband decoupling network of concept based on signal.
Fig. 3 disturbs the vertical view of the microwave broadband decoupling network of concept based on signal.
Fig. 4 disturbs the simulate and test S parameter characteristic comparison diagram of the microwave broadband decoupling network of concept based on signal.
Fig. 5 disturbs the test normalization antenna pattern of the microwave broadband decoupling network of concept based on signal.
Embodiment
The microwave broadband decoupling network principle of disturbing concept based on signal of the present invention as shown in Figure 1, comprises broadband coupling slot wire antenna 1, two symmetrical broadband branch line directional couplers 2, micro-band connecting line 4.Except the path that antenna itself is gone out electromagenetic wave radiation, dotted line represents two mutual coupling 3 between antenna, and solid line is illustrated in antenna feed place and introduces another paths, in circle after part Energy Coupling, can on this paths, produce point of zero voltage, thereby reduce mutual coupling.Design the decoupling network in broadband, need corresponding broad-band antenna.Compare paster antenna, open circuit line of rabbet joint antenna has the advantage in broadband, therefore in the present invention, utilize the mode of the 50 Ω microstrip line transition line of rabbet joint of short circuit to carry out feed, form broadband coupling slot wire antenna 1, the open end 1-1 of the line of rabbet joint makes plane horn shape, and being conducive to can be comparatively smooth at required frequency range standing internal wave; The short-circuit end 1-3 of the line of rabbet joint makes fan-shaped, not only reduces circuit area, can mate by regulating fan-shaped radian to obtain transition.A kind of broadband branch line directional coupler 2 is applied in circuit design.Compare with traditional branch line coupler, each port is quarter-wave transmission line.Isolated port 2-3 mates by plated-through hole 7 ground connection with 50 Ω Chip-Rs 8.
In conjunction with Fig. 2 and Fig. 3, a kind of microwave broadband decoupling network that disturbs concept based on signal of the present invention, comprises broadband coupling slot wire antenna 1, two symmetrical broadband branch line directional couplers 2, micro-band connecting line 4, medium substrate 5, plated-through hole 7 and Chip-Rs 8;
The upper surface of medium substrate 5 is printed two symmetrical broadband branch line directional couplers 2, the lower surface of medium substrate 5 is printed broadband coupling slot wire antenna 1, the unit of described broadband coupling slot wire antenna 1 is two, each broadband branch line directional coupler 2 includes straightthrough port 2-1, coupling aperture 2-2 and isolated port 2-3, wherein straightthrough port 2-1 is connected with corresponding coupling slot wire antenna Unit 1, broadband by the plated-through hole on medium substrate 5, carry out energy transition, two symmetrical coupling aperture 2-2 are connected by micro-band connecting line 4, isolated port 2-3 is connected with the ground metallization through hole on medium substrate 5 by Chip-R 8, described Chip-R 8 is also arranged on the upper surface of medium substrate 5.
Each coupling slot wire antenna Unit 1, broadband includes open end 1-1, short-circuit end 1-2 and line of rabbet joint 1-3, and wherein open end 1-1 is connected with short-circuit end 1-2 by line of rabbet joint 1-3, and described open end 1-1 is plane horn shape, and short-circuit end 1-2 is sector structure; Two unit center distances are 0.5 λ
0-0.75 λ
0, λ
0for the wavelength in free space.
The dielectric constant of medium substrate 5 is 2.2,3.8,4.4 or 10.2.The thickness of medium substrate 5 is 0.5mm, 0.8mm, 1.0mm or 1.6mm.Preferably, the material of medium substrate 5 is FR4, and its effective dielectric constant is 4.3～4.4, and thickness is 0.8mm.
Particularly, the present invention is individual layer PCB structure, and medium substrate 5 upper and lower surfaces are metal copper sheet, and wherein upper surface is microstrip line construction, and lower surface is metal ground.Two symmetrical broadband branch line directional couplers 2 are connected by micro-band connecting line 4, and one has four plated-through holes 7 in order to connect upper and lower metal copper sheet.Isolated port 2-3 at directional coupler loads Chip-R 8, the other end ground connection of Chip-R 8.Medium substrate 5 lower surfaces etch broadband coupling slot wire antenna 1, and wherein open end 1-1 is connected with short-circuit end 1-2 by line of rabbet joint 1-3, and described open end 1-1 is plane horn shape, and short-circuit end 1-2 is sector structure.Micro-line of rabbet joint that takes to is by plated-through hole 7 transition.
The DIELECTRIC CONSTANT ε of described medium substrate 5
rbe 4.4, thickness is 0.8mm.The optional scope of dielectric constant is 2.2-10.2, and the optional scope of thickness is 0.5-1.6mm.
Antenna element centre-to-centre spacing is 0.5 λ
0-0.75 λ
0, λ wherein
0for the wavelength in free space.
In described broadband branch line directional coupler 2, every section of transmission line electrical length is quarter-wave, and its input/output terminal is 50 Ω microstrip lines.
Below in conjunction with embodiment, the details of concrete device of the present invention and working condition are carried out to refinement explanation.
Embodiment 1
Complete circuit board is of a size of 130mm * 101.7mm; The line of rabbet joint width of antenna part is 0.2mm, and length is 12.5mm.In order to obtain coupling preferably in working band, line of rabbet joint open end is designed to plane horn shape, can allow the mild transition of antenna feed impedance.Loudspeaker opening maximum distance is 28mm, and minimum place distance is 2mm.Line of rabbet joint short-circuit end is designed to fan-shaped, by regulating fan-shaped radian and radius can obtain comparatively desirable energy transition.Fan-shaped radian is 10 degree, and radius is 6.5mm.The circuit structure of coupler section is that traditional branch line directional coupler adds quarter-wave transmission line, wherein traditional branch line forms square shape structure, longitudinally length and the width of microstrip line are respectively 17.8mm and 3.28mm, and laterally length and the broadband of microstrip line are respectively 19mm and 0.82mm.The length of quarter-wave transmission line and width are 18.3mm and 2.44mm.The microstrip line length and the width that connect two directional couplers are 40mm and 1.53mm.Four plated-through hole radiuses are 0.4mm, are highly 0.8mm.For the isolated port of coupling coupler, at the isolated port loading Chip-R of each coupler, its encapsulation model is 0805, and resistance is 50 Ω.
The beamwidth of antenna of this example meets design requirement substantially, and circuit board size is larger, may cause sheet material bending in test process, and therefore the coupling at part frequency is not fine.As shown in Figure 4, the test result of isolation will improve 2-3dB than simulation result, and is all greater than 15dB within the scope of 1.8-2.7GHz, and wherein 2.1GHz place reaches 25dB.In addition, the normalized radiation pattern of test as shown in Figure 5.Although radiation is unstable in some direction, E face still approaches the antenna pattern of individual antenna unit very much.H face is to be also combined to by two unit are same, forms negative 90 degree direction radiation and reduces.Compare the antenna pattern of the coupled antenna that there is no decoupling network, the radiation of E face and H face has larger improvement.
To the present invention is based on the preparation process of the wide-band microwave absorber of folded dipole, be described in detail below: (1) first, determines the centre frequency of decoupling network and the parameter of medium substrate, is mainly dielectric constant and thickness.Size based on pcb board material and the consideration of total weight, thickness is chosen between 0.5mm～1.6mm conventionally.
(2) by the index of decoupling network, determined the working band of broad-band antenna.
(3) closely place two antenna elements and form coupled antenna, when antenna distance reduces, coupling strengthens, and conventionally selecting center of antenna spacing is 0.5 λ
0-0.75 λ
0.
(4) according to mutual coupling of antenna size design directional coupler in step (3), the degree of coupling and mutual coupling of antenna in coupler working frequency range need to be consistent, could offset by forming energy like this.
(5) coupler is connected with individual antenna, and optimized circuit parameter, to guarantee not affect the performance of non-coupled antenna.
(6) according to definite circuit parameter in step (5), connect the coupling aperture of two couplers, the electrical length of connecting line is optimized, to obtain best decoupling effect.
As from the foregoing, the present invention requires to design to the broadband of working frequency range for adapting to multiaerial system, based on signal, disturb concept and introduce an energy transmission path, the energy of mutual coupling of antenna and the energy of introducing on path form anti-phase counteracting, thereby realize the effect that improves antenna element isolation, at centre frequency place, can reach 25dB; In addition, decoupling network also has the function of improving radiation pattern.E face directional diagram greatest irradiation direction is 0 degree and 180 degree, the i.e. forwards of medium version and dorsad.Synthetic by two unit homophase wave beams on H face, radiation reduces in negative 90 degree directions.
Claims (5)
1. a microwave broadband decoupling network that disturbs concept based on signal, it is characterized in that, comprise broadband coupling slot wire antenna [1], two symmetrical broadband branch line directional couplers [2], micro-band connecting line [4], medium substrate [5], plated-through hole [7] and Chip-Rs [8];
The upper surface of medium substrate [5] is printed two symmetrical broadband branch line directional couplers [2], the lower surface of medium substrate [5] is printed broadband coupling slot wire antenna [1], the unit of described broadband coupling slot wire antenna [1] is two, each broadband branch line directional coupler [2] includes straightthrough port [2-1], coupling aperture [2-2] and isolated port [2-3], wherein straightthrough port [2-1] is connected with corresponding broadband coupling slot wire antenna [1] unit by the plated-through hole on medium substrate [5], carry out energy transition, symmetrical two coupling apertures [2-2] are connected by micro-band connecting line [4], isolated port [2-3] is connected with the ground metallization through hole on medium substrate [5] by Chip-R [8], described Chip-R [8] is also arranged on the upper surface of medium substrate [5].
2. the microwave broadband decoupling network that disturbs concept based on signal according to claim 1, it is characterized in that, each broadband coupling slot wire antenna [1] unit includes open end [1-1], short-circuit end [1-2] and the line of rabbet joint [1-3], wherein open end [1-1] is connected with short-circuit end [1-2] by the line of rabbet joint [1-3], described open end [1-1] is plane horn shape, and short-circuit end [1-2] is sector structure; Two unit center distances are 0.5 λ
0-0.75 λ
0, λ
0for the wavelength in free space.
3. the microwave broadband decoupling network that disturbs concept based on signal according to claim 1 and 2, is characterized in that, the dielectric constant of medium substrate [5] is 2.2,3.8,4.4 or 10.2.
4. the microwave broadband decoupling network that disturbs concept based on signal according to claim 1 and 2, is characterized in that, the thickness of medium substrate [5] is 0.5mm, 0.8mm, 1.0mm or 1.6mm.
5. the microwave broadband decoupling network that disturbs concept based on signal according to claim 1 and 2, is characterized in that, the material of medium substrate [5] is FR4, and its effective dielectric constant is 4.3～4.4, and thickness is 0.8mm.
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| CN201410370581.8A CN104134866B (en) | 2014-07-30 | 2014-07-30 | Microwave broadband decoupling network based on signal disturbing concept |
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| CN201410370581.8A CN104134866B (en) | 2014-07-30 | 2014-07-30 | Microwave broadband decoupling network based on signal disturbing concept |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108377154A (en) * | 2018-02-05 | 2018-08-07 | 广东欧珀移动通信有限公司 | Harmonic suppression apparatus, harmonic suppressing method and electronic device |
| CN110233349A (en) * | 2019-04-24 | 2019-09-13 | 西安易朴通讯技术有限公司 | Multi-input/output antenna and terminal device |
| CN110797642A (en) * | 2019-11-15 | 2020-02-14 | Oppo广东移动通信有限公司 | Antenna module and terminal |
| CN111969312A (en) * | 2020-08-14 | 2020-11-20 | 中国人民解放军空军工程大学 | Antenna array |
| CN112164890A (en) * | 2020-08-31 | 2021-01-01 | 西安朗普达通信科技有限公司 | Stack decoupling network |
| CN112164891A (en) * | 2020-08-31 | 2021-01-01 | 西安朗普达通信科技有限公司 | Offset decoupling chip |
| CN112768936A (en) * | 2020-12-30 | 2021-05-07 | 深圳市信丰伟业科技有限公司 | Discrete 5G antenna isolation system |
| CN113659307A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN113659308A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN113659295A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Filter, antenna device, and electronic apparatus |
| CN113659337A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device, electronic apparatus, and decoupling method for antenna device |
| WO2021227830A1 (en) * | 2020-05-12 | 2021-11-18 | 西安电子科技大学 | Antenna apparatus and electronic device |
| WO2021227826A1 (en) * | 2020-05-12 | 2021-11-18 | 西安电子科技大学 | Antenna apparatus and electronic device |
| CN113659337B (en) * | 2020-05-12 | 2024-06-07 | 西安电子科技大学 | Antenna device, electronic apparatus, and decoupling method for antenna device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108377154A (en) * | 2018-02-05 | 2018-08-07 | 广东欧珀移动通信有限公司 | Harmonic suppression apparatus, harmonic suppressing method and electronic device |
| CN110233349A (en) * | 2019-04-24 | 2019-09-13 | 西安易朴通讯技术有限公司 | Multi-input/output antenna and terminal device |
| CN110797642A (en) * | 2019-11-15 | 2020-02-14 | Oppo广东移动通信有限公司 | Antenna module and terminal |
| WO2021227826A1 (en) * | 2020-05-12 | 2021-11-18 | 西安电子科技大学 | Antenna apparatus and electronic device |
| CN113659337A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device, electronic apparatus, and decoupling method for antenna device |
| CN113659337B (en) * | 2020-05-12 | 2024-06-07 | 西安电子科技大学 | Antenna device, electronic apparatus, and decoupling method for antenna device |
| WO2021227830A1 (en) * | 2020-05-12 | 2021-11-18 | 西安电子科技大学 | Antenna apparatus and electronic device |
| CN113659307A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN113659308A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Antenna device and electronic apparatus |
| CN113659295A (en) * | 2020-05-12 | 2021-11-16 | 西安电子科技大学 | Filter, antenna device, and electronic apparatus |
| CN111969312A (en) * | 2020-08-14 | 2020-11-20 | 中国人民解放军空军工程大学 | Antenna array |
| CN112164890A (en) * | 2020-08-31 | 2021-01-01 | 西安朗普达通信科技有限公司 | Stack decoupling network |
| CN112164890B (en) * | 2020-08-31 | 2023-05-09 | 西安朗普达通信科技有限公司 | Stacked decoupling network |
| CN112164891B (en) * | 2020-08-31 | 2023-05-23 | 西安朗普达通信科技有限公司 | Cancellation decoupling chip |
| CN112164891A (en) * | 2020-08-31 | 2021-01-01 | 西安朗普达通信科技有限公司 | Offset decoupling chip |
| CN112768936A (en) * | 2020-12-30 | 2021-05-07 | 深圳市信丰伟业科技有限公司 | Discrete 5G antenna isolation system |
| CN112768936B (en) * | 2020-12-30 | 2024-03-29 | 深圳市信丰伟业科技有限公司 | Discrete 5G antenna isolation system |
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