CN101383449A - Method for enhancing antenna separation degree - Google Patents
Method for enhancing antenna separation degree Download PDFInfo
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- CN101383449A CN101383449A CNA200810119367XA CN200810119367A CN101383449A CN 101383449 A CN101383449 A CN 101383449A CN A200810119367X A CNA200810119367X A CN A200810119367XA CN 200810119367 A CN200810119367 A CN 200810119367A CN 101383449 A CN101383449 A CN 101383449A
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Abstract
The invention relates to a method for improving the isolation degree of certain airborne antennae, comprising floor board deforming design and numerical value operation. The method comprises the following steps: (1) characteristics of mutually interfered antennae are tested and determined; (2) the deforming structure of the floor board is reasonably designed based on concrete space conditions and the isolation degree of the mutually interfered antennas so as to meet the requirement of the isolation degree; (3) numerical value emulational operation is performed and the results of the isolation degree of the antennae are compared. The method improves the mutual interference among the airborne antennae, improves the reliability of an airborne communication system and simultaneously meets the requirements of an airplane for the pneumatic performance and the weight.
Description
Technical field
The present invention is a kind of method that improves isolation between antennas, belongs to the application foundation field.
Background technology
Along with electronics and development of Communication Technique, the application of the wireless device of various functions is increasingly extensive.Especially aboard, in order to satisfy needs such as communication, navigation, the quantity of antenna is multiplied on the airborne platform, and the multi-section antenna is worked in very little zone simultaneously, has caused serious electromagnetic interference.The main delivering path of electromagnetic interference is the coupling between antenna between radio system.For realizing the operate as normal between each antenna, avoid the phase mutual interference, requirement reduces the harmful coupling between antenna.Therefore, improve the precondition that isolation between antennas has become compatible work such as the electronic system that realizes airborne antenna.In actual engineering, the measure of the raising isolation that requirement is taked should be protected the pneumatic property of aircraft as far as possible, and takies the space of airborne platform less as far as possible.
Summary of the invention
A kind of method that improves isolation between antennas that purpose of the present invention proposes at this technical problem just, the characteristics of this method be principle succinct, deal with problems easy, the engineering exploitativeness is good.
For addressing the above problem, the present invention adopts following technical scheme:
A kind of method that improves isolation between antennas may further comprise the steps:
1) by actual test, determines that two are disturbed antenna characteristics mutually;
2), determine to disturb mutually to disturb the main transmission path of electromagnetic wave on body between antenna mutually by actual test;
3) will disturb the distortion floor that floor on the electromagnetic main transmission path between antenna is designed to repetition formula groove structure mutually.
The determined antenna characteristics of disturbing mutually comprises: installation site, operating frequency, bandwidth of operation, disturbed frequency or disturbed frequency range and the aerial radiation characteristic of disturbing antenna mutually.
Further:
The degree of depth of described groove is greater than 1/6 of the operation wavelength of antenna.
After described step 3), proceed step 4): in computer, set up simulation model, carry out the numerical simulation computing, observe the isolation result of variations, thereby determine the degree of depth of floor groove.
The invention has the advantages that:
1. improved the electromagnetic interference between airborne antenna.This method has prolonged disturbs electromagnetic transmission path between antenna mutually, has increased the attenuation of Electromagnetic loss, can not destroy under the aerial radiation characteristic condition substantially, improves the isolation of two antennas.
2. simple in structure.As everyone knows, there is very strict restriction the weight of airborne equipment, installation site, and the floor deformation structure that the present invention adopts can not increase aircraft weight substantially, does not destroy the layout of airborne equipment.
3. exploitativeness is good, is easy to engineering practice.
Description of drawings
Fig. 1 is the simplified model of certain engineering problem.
Fig. 2 improves the schematic diagram of isolation for the method for the floor deformation of the present invention's proposition.
Fig. 3 is to problem shown in Figure 1, and former and later two disturb s between antenna mutually to use the inventive method
21The parameter situation of change.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
The present invention is a kind of method that improves the airborne antenna isolation, and it comprises modeling and simulating and computing based on the correlation theory that electromagnetic wave is decayed on transmission path, carry out appropriate design according to result of calculation, and the concrete steps of this method are:
(1) adopts actual method of testing, determine that two are disturbed antenna performance mutually, comprise installation site, operating frequency, bandwidth of operation, disturbed frequency or disturbed frequency range and the aerial radiation characteristic of disturbing antenna mutually.
(2), determine to disturb mutually to disturb the main transmission path of electromagnetic wave on body between antenna mutually by actual test.
(3),, make the deformation design of rational repetition formula groove structure to disturbing floor on the electromagnetic main transmission path between antenna mutually according to actual required insulated degree requirement according to disturbing the main transmission path of electromagnetic wave on body mutually.
The correlation theory of floor on the main transmission path being made the deformation design of repetition formula groove structure is presented below:
Isolation between antennae is the major parameter of airborne platform electromagnetic compatibility, is used for characterizing the strong and weak degree of coupling between antenna.It is defined as the ratio of an antenna transmitting power and another antenna institute received power, represents with dB.According to network thought, be one two port reciprocal network with the transmission path equivalence between two antennas and two antennas, the feed end of two antennas is as two ports of network, and a port connects signal source, and another port connects load.Then the isolation of antenna can be expressed as: the peak power output P of signal source
aWith load absorbed power P
lRatio, promptly isolation IDL can be expressed as with logarithm
IDL(dB)＝10log|P
a/P
l| (1)
Further calculate, following formula can be expressed as with scattering S parameter
IDL(dB)＝20log|S
12| (2)
Wherein, S
12Transmission coefficient between expression antenna ends mouth; S in reciprocal network
12=S
21
In actual engineering,, generally the isolation of antenna is estimated with empirical equation to the antenna far-field region.The engineering estimation equation is as follows:
L＝22+20lg(d/λ)-(G
t+G
r)+C
In the formula, L is the horizontal isolation (dB) of two antennas; D is two antenna horizontal ranges (m); λ-antenna operation wavelength (m); G
tAnd G
r-transmit and receive antenna gain (dBi); C-stops bodywaste (dB); The back-to-back placement of two antennas.Abbreviation is:
L＝-27.54+20lg(f)+20lg(d)-(G
t+G
r)+C
Wherein f is the operating frequency of antenna.
On airborne platform, in view of space and aerodynamic consideration, the isolation that requires to be taked is improved one's methods, and should be able to realize disturbing mutually in broad frequency band under the prerequisite of good isolation between antenna, does not increase aircraft weight and does not destroy aerodynamic performance as far as possible.So the interested method that deformation design becomes research is carried out in the electromagnetic wave propagation path of disturbing mutually between antenna.
The present invention is out of shape the floor of disturbing mutually between antenna, is designed to the groove structure that repeats to change, and concrete size, the number of groove designed.So just, can prolong and disturb electromagnetic transmission path between antenna mutually, thereby increase the attenuation of Electromagnetic loss, ensure under the immovable situation of aerial radiation as far as possible, improve isolation between antennae.Floor depression basic structure specifies sees Fig. 2.
(4) in computer, use HFSS Electromagnetic Simulation software based on finite element algorithm (FEM), set up the simulation model of two antennas to be analyzed.In this software, institute's established model is calculated, observe isolation and change.Thereby determine the degree of depth of floor groove by repeated calculation.
Specify below by institute's established model.
As shown in Figure 1, a pair of little band dual-mode antenna, operating frequency is 4.3GHz, is installed under the ventral, is used to survey ground object and interplane distance.The electromagnetic wave 1 of transmission antennas transmit is through the ground object reflection, and its reflected wave 2 is received antenna and receives, thus treated definite object space.This crosses range request, and transmitting antenna is leaked to the electromagnetic energy 3 of reception antenna should be as far as possible less than may detect maximum distance place reflected by objects intensity of wave.Existing isolation between antennas is about-50dB about, requirement should reach-60dB or higher as far as possible.Below analysis and research are based on above-mentioned model.
Set up the simplified model (as shown in Figure 2) of the problems referred to above: the operating frequency of paster antenna is made as 4.3GHz, then the about 70mm of respective wavelength; If the about 150mm of two antenna distances (two dielectric-slab Edge Distances).XY adopts on the plane symmetrical H border in this model, and left-right symmetric; At the paster shown in the model (being arranged in the upper surface at figure two ends) length and width is respectively 21.5mm and 9mm; Depth of groove is 17mm, wide about 10mm.
Find through HFSS Electromagnetic Simulation computed in software: along with the increase of depth of groove, isolation improves obviously; Consider the pneumatic property of airborne platform, can suitably adjust depth of groove.Calculate to find, in this model, depth of groove during greater than 1/6 operation wavelength isolation improve obviously.In this model, depth of groove is about 1/4 operation wavelength, and isolation improves about 20dB in whole required frequency band.Find in simulation calculation: the groove number is not obvious to the isolation influence; The width of recessed groove equates to be advisable with the width of projection; Depth of groove from a left side to (this model is a symmetry model) fade effect can be better successively, but remain further to be researched and analysed.
Fig. 3 illustrates application the inventive method, and former and later two disturb s between antenna mutually
21The parameter situation of change.Wherein: solid line is the S12 amplitude range when not adopting floor deformation :-50.87dB～-48.5dB; Behind the floor deformation S21 amplitude range then be-75.69dB～-68.91dB.
Claims (4)
1. method that improves isolation between antennas is characterized in that may further comprise the steps:
1) by actual test, determines that two are disturbed antenna characteristics mutually;
2), determine to disturb mutually to disturb the main transmission path of electromagnetic wave on body between antenna mutually by actual test;
3) floor that will disturb the electromagnetic main transmission path place between antenna mutually is designed to the distortion floor of repetition formula groove structure.
2. a kind of method that improves isolation between antennas as claimed in claim 1 is characterized in that:
The antenna characteristics of determining in the described step 1) of disturbing mutually comprises: installation site, operating frequency, bandwidth of operation, disturbed frequency or disturbed frequency range and the aerial radiation characteristic of disturbing antenna mutually.
3. a kind of method that improves isolation between antennas as claimed in claim 1 is characterized in that:
The degree of depth of described groove is greater than 1/6 of the operation wavelength of antenna.
4. a kind of method that improves isolation between antennas as claimed in claim 1 is characterized in that:
After described step 3), proceed step 4):
4) in computer, set up simulation model, carry out the numerical simulation computing, observe the isolation result of variations, thereby determine the degree of depth of floor groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810119367XA CN101383449A (en) | 2008-09-04 | 2008-09-04 | Method for enhancing antenna separation degree |
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|---|---|---|---|
| CNA200810119367XA CN101383449A (en) | 2008-09-04 | 2008-09-04 | Method for enhancing antenna separation degree |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570029A (en) * | 2011-12-31 | 2012-07-11 | 嘉兴佳利电子股份有限公司 | Method for improving isolation degree of laminated antennas |
| CN101425622B (en) * | 2008-11-20 | 2013-01-30 | 北京航空航天大学 | Floor configuration having enhanced isolation degree between two antennas |
| CN103151614A (en) * | 2013-02-22 | 2013-06-12 | 中国舰船研究设计中心 | Suppressing method for electromagnetic coupling between ship-borne coplanarly-arranged planar array antennas |
| CN103441325A (en) * | 2013-08-15 | 2013-12-11 | 华为技术有限公司 | Communication antenna system |
| WO2014000342A1 (en) * | 2012-06-25 | 2014-01-03 | 中兴通讯股份有限公司 | Antenna ground plate and wireless device |
| CN103647590A (en) * | 2013-11-21 | 2014-03-19 | 航天恒星科技有限公司 | Method for determining transmit-receive isolation of phased array antenna |
| CN106951607A (en) * | 2017-03-06 | 2017-07-14 | 电子科技大学 | A kind of electrically large platform modeling method for being used to calculate isolation between antenna |
| CN112134031A (en) * | 2020-08-18 | 2020-12-25 | 欧必翼太赫兹科技(北京)有限公司 | Transmit-receive antenna array apparatus and method of designing the same |
| CN112449352A (en) * | 2019-09-03 | 2021-03-05 | 丽水青达科技合伙企业(有限合伙) | Method for measuring and calculating space isolation |
-
2008
- 2008-09-04 CN CNA200810119367XA patent/CN101383449A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425622B (en) * | 2008-11-20 | 2013-01-30 | 北京航空航天大学 | Floor configuration having enhanced isolation degree between two antennas |
| CN102570029A (en) * | 2011-12-31 | 2012-07-11 | 嘉兴佳利电子股份有限公司 | Method for improving isolation degree of laminated antennas |
| WO2014000342A1 (en) * | 2012-06-25 | 2014-01-03 | 中兴通讯股份有限公司 | Antenna ground plate and wireless device |
| CN103151614A (en) * | 2013-02-22 | 2013-06-12 | 中国舰船研究设计中心 | Suppressing method for electromagnetic coupling between ship-borne coplanarly-arranged planar array antennas |
| CN103441325B (en) * | 2013-08-15 | 2015-08-19 | 华为技术有限公司 | A kind of communications antenna system |
| CN103441325A (en) * | 2013-08-15 | 2013-12-11 | 华为技术有限公司 | Communication antenna system |
| CN103647590A (en) * | 2013-11-21 | 2014-03-19 | 航天恒星科技有限公司 | Method for determining transmit-receive isolation of phased array antenna |
| CN106951607A (en) * | 2017-03-06 | 2017-07-14 | 电子科技大学 | A kind of electrically large platform modeling method for being used to calculate isolation between antenna |
| CN106951607B (en) * | 2017-03-06 | 2020-02-18 | 电子科技大学 | Electricity large platform modeling method for calculating isolation between antennas |
| CN112449352A (en) * | 2019-09-03 | 2021-03-05 | 丽水青达科技合伙企业(有限合伙) | Method for measuring and calculating space isolation |
| CN112449352B (en) * | 2019-09-03 | 2023-03-31 | 丽水青达科技合伙企业(有限合伙) | Method for measuring and calculating space isolation |
| CN112134031A (en) * | 2020-08-18 | 2020-12-25 | 欧必翼太赫兹科技(北京)有限公司 | Transmit-receive antenna array apparatus and method of designing the same |
| CN112134031B (en) * | 2020-08-18 | 2021-09-21 | 欧必翼太赫兹科技(北京)有限公司 | Transmit-receive antenna array apparatus and method of designing the same |
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Open date: 20090311 |