CN101533958A - Microstrip antenna structure and optimal adjustment method - Google Patents
Microstrip antenna structure and optimal adjustment method Download PDFInfo
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- CN101533958A CN101533958A CN200910082135A CN200910082135A CN101533958A CN 101533958 A CN101533958 A CN 101533958A CN 200910082135 A CN200910082135 A CN 200910082135A CN 200910082135 A CN200910082135 A CN 200910082135A CN 101533958 A CN101533958 A CN 101533958A
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Abstract
A microstrip antenna structure and an optimal adjustment method belong to the field of wireless communication equipment. The microstrip antenna structure is a standing wave type microstrip slot antenna comprising an antenna panel prepared by a single-sided copper-clad dielectric substrate and a feed, the slot antenna is an arch-shaped radiation structure which is constituted by a rectangular right angle continuous slot and is centrally symmetrical; cable feed lines are coaxial cables which are connected with connectors at end parts, the cable feed lines are connected at determined positions of A and B on the antenna panel and led to the outside of the antenna panel. The corresponding parameter optimal adjustment method of the microstrip antenna structure is operated according to the following steps of carrying out the optimal design of practical size parameters of X, a, b and c on the antenna respectively; taking the tested interference performance as the standard of the optimal adjustment of the parameters; adjusting the feed point of the antenna and realizing the regulation of the central frequency of the antenna. The antenna can provide the bandwidth guarantee for the future high-speed data transmission, and the antenna has small size, simple structure, easy processing and convenient integration with an active circuit.
Description
Technical field
The invention belongs to field of wireless communication devices, specially refer to a kind of microstrip antenna structure and Parameter Optimization method of adjustment thereof.
Background technology
Antenna is to transmit and receive an electromagnetic important wireless device.The radiofrequency signal power of radio transmitter output is transported to antenna by feeder line (cable), is radiate with the electromagnetic wave form by antenna.Electromagnetic wave propagation is received by antenna behind the reception place, and delivers to radio receiver by feeder line.Antenna is various in style, requires under the situation for different application frequency, different occasion, purposes, difference, and employed antenna structure is inequality.
With antenna the human body central site network system of close association is arranged, its antenna has played important role.Described human body central site network technology is a kind of emerging wireless communication technology with wide application prospect, the access problem that its main research direction is last meter in the wireless communication technology.Along with the miniaturization of electronic product and the reduction of its price, provide possibility for setting up personal information and communication system.The product that can make up the human body central site network at present comprises mobile phone, PDA(Personal Digital Assistant), micro radio sensing device etc.
The health status that near these wireless devices human body and micro radio sensing device can come monitoring human by shared data.Antenna chooses main requirement and systems radiate standard according to transmitted data on network in network.Particularly, antenna need be operated in the corresponding work frequency range, satisfy certain transmission range, and antenna must satisfy under NRPB (Britain BRP) and ICNIRP (committee is protected in international Non-ionizing radiation) the prescribed limit standard to the electromagnetic radiation of human body.
Has par with the above-mentioned type antenna, it is the plane inverse-F microstrip antenna that the present invention mentions, microstrip antenna is a kind of new antenna that grows up gradually the twentieth century middle and later periods, wireless near field communication is when physical layer transmission and received RF signal, and generally the radio frequency unit of Cai Yonging is a microstrip antenna.Wherein (Planar Inverted-F Antenna PIFA) is the smaller antenna commonly used of size in the microstrip antenna to planar inverted-F antenna.As the example of a known technology of microstrip antenna, but reference table is shown in the structural representation on the accompanying drawing 1.Dielectric substrate shown in the figure is of a size of 110mm * 50mm * 1mm, adopts the FR4 material of DIELECTRIC CONSTANT r=3.15 to realize.Black part is divided into metal level among the figure, and colourless part is a dielectric layer.The metal inverted F paster of dielectric substrate end face occupies the space of whole substrate 25mm * 5mm, is the main radiant section of antenna, and feedback point and earth point are as shown in Figure 1.The ground plate of dielectric substrate bottom surface is a rectangular metal sheet with the same size of substrate, on the bottom surface of the dielectric substrate relative, have with the F zone above the dielectric substrate one with the regional corresponding rectangular indentation of F.The size of antenna various piece parameter is as follows: d1=1mm, d2=1mm, 1=23mm, w1=3mm, w2=1mm, s=3mm, h2=4mm, w3=1mm.
This kind of antenna structure centre frequency is 2.45GHz, and relative bandwidth is greater than 5%, and standing-wave ratio is less than 1.5, antenna gain 2.85dB, and the input impedance on the centre frequency is near 50 ohm of pure resistances, and efficient is 79%.Though this inverse-F antenna can be used in the wireless near field communication aspect, particularly be used in the human body central site network.But also there are a lot of weak points in it, especially at low-k (ε
r=3.15) under, its dielectric substrate size is big, and antenna system efficient is low.For radio frequency integrated circuit, the interference that brings for fear of the circuit own radiation, simultaneously also in order to reduce circuit size, the dielectric material that need select high-k for use is as circuit substrate, but under high-k, the bandwidth of operation of antenna narrows down, less than 3%, be difficult to satisfy the requirement of bluetooth frequency range.Therefore, obtaining enough wide bandwidth, is urgent problem in this structural antenna.
Summary of the invention
The technical issues that need to address of the present invention, be in the prior art the weak point that exists of the microstrip antenna that adopts, these deficiencies mainly are narrow bandwidth, efficient is low, and especially along with the rising of the dielectric constant of substrate, bandwidth more be cannot say for sure card, efficient is very low, and caloric value is big.
At above situation, purpose of the present invention is to provide a kind of microstrip antenna structure and Parameter Optimization method of adjustment thereof.It is little that the present invention has designed a reflection coefficient, and coupling is good, and volume is little, in light weight, bandwidth, the antenna structure of excellent performance.This antenna can be applied to the wireless near field communication field, such as being applied in the wireless network of human body center.
The objective of the invention is to realize by the following technical solutions, a kind of microstrip antenna structure, this structure belongs to the standing wave type microstrip slot antenna, comprise that single face covers aerial panel and feed source that the copper medium substrate is made, it is characterized in that, described slot antenna is the centrosymmetric arc irradiation structure that continuous slit, rectangle right angle constitutes; Described feed source is the coaxial cable that is connected with sub-miniature A connector by the end, and it is connected on the aerial panel really allocation A, B two places and draws outside aerial panel.At the various antenna applications of wireless near field communication, equipment uses the 2.4GHz frequency range to communicate mostly.The design of antenna of the present invention is a kind of standing wave type microstrip slot antenna structure, and it is made up of the sub-miniature A connector of an aerial panel and a band coaxial cable.Aerial panel covers the copper medium substrate by single face to be made, and opens continuous slit, rectangle right angle on the metallic plate that medium substrate one side is printed, and as main radiation source, obtains more stable broad beam directional diagram with this; This antenna adopts the coaxial line feed, and is connected with sub-miniature A connector, to obtain the broadband impedance characteristic; By arc slit omnidirectional radiation, the gain that has also improved antenna.Select for use during design insulation property preferably pottery do dielectric layer, its dielectric constant is 9.6.This microstrip slot antenna centre frequency is designed to the 2.4GHz frequency range.In the design process of antenna, need adjust in the hope of reaching parameter wherein and be fit to be applied to the human body network more.Particularly, according to following consideration, A) respectively to the actual size parameter X of antenna, a, b, c is optimized design, can make the gain of antenna reach actual demand.The antenna data that the present invention discussed is as shown in table 1.
Each parameter detailed data table of table 1 antenna
| Parameter | X | a | b | C |
| Numerical value mm | 3.2 | 30.4 | 7.6 | 17.6 |
The size of antenna is obvious to the frequency influence of antenna, amplifies or the size of dwindling entire antenna can be regulated the center of antenna frequency by geometric ratio.When adjusting antenna size, the frequency characteristic of antenna is to have carried out linear translation along frequency spectrum, according to the method, can design the antenna size that satisfies the human body network.The distributing point of last antenna has certain corrective action to the performance of antenna, distributing point that can be by diverse location choose the antenna of realizing different center frequency.Regulate these parameters according to the demand of reality, realize the frequency of antenna is adjusted, design optimized antenna.B) standard of adjusting as parameter optimization with the jamming performance of being tested adopts Electromagnetic Simulation software CST that this antenna is carried out the Electromagnetic Simulation design, can obtain the parameter return loss S of this microstrip slot antenna
11State diagram, as shown in Figure 4: the centre frequency of antenna just in time is in 2.45GHz, and-10dB bandwidth is about 115MHz, and this point can obtain minimum return loss value, and the return loss of all the other frequency bands obviously rises, and has illustrated that antenna has better anti-disturbance performance.C) distributing point of adjustment antenna is realized the adjusting of center of antenna frequency.
Generally,, it is characterized in that according to the pairing parameter optimization adjustment of above-mentioned microstrip antenna structure, operation as follows, A) respectively to the actual size parameter X of antenna, a, b, c is optimized design; B) standard of adjusting as parameter optimization with the jamming performance of being tested; C) distributing point of adjustment antenna is realized the adjusting of center of antenna frequency.
This antenna can guarantee for following high speed data transfer provides bandwidth.The design of concrete antenna as shown in Figure 1, wherein the grey color part of design drawing is a dielectric layer, white portion is a copper film, at the mid portion of antenna, the A point is connected with coaxial feeder with the B point.This antenna size is little, and is simple in structure, and processing is convenient to active circuit integrated easily.
Description of drawings
Fig. 1 is a known technology midplane inverse-F antenna structural representation;
Fig. 2 is the designed microstrip antenna figure of the present invention;
Fig. 3 is the designed microstrip antenna structure schematic diagram of the present invention;
Fig. 4 is the antenna return loss curve;
Fig. 5 is the change curve to zooming parameter SCA;
Fig. 6 is S
11With the laterally mobile variation of distributing point;
Fig. 7 is S
11The variation that vertically moves with distributing point;
Fig. 8 is an antenna impedance Smith circle diagram.
Embodiment
With reference to Fig. 1, expression known technology midplane inverse-F antenna structural representation, it can't satisfy wide band requirement, with reference to Fig. 2, Fig. 3, the designed microstrip antenna structure schematic diagram of expression the present invention, 1 is standing wave type microstrip slot antenna assembly among the figure, figure empty part 2, dielectric layer part on the representative antennas panel, dash area 3 is represented the copper film part, and the feed cable 4 that connects between A, the B two definite location points is guided outside port into by the sub-miniature A connector 6 of identical coaxial feed cable 5 and end thereof.With reference to Fig. 4 to Fig. 8, expression measured characteristic curve chart and Smith circle diagram are from the angle of researching antenna electricity size, if antenna structure remains unchanged, when the electric size of antenna becomes big, the radiable electromagnetic wavelength of antenna institute is elongated in general, and its frequency is with regard to corresponding reduction.On the basis of embodiment, keep antenna designs constant, the size of amplifying or dwindling antenna on year-on-year basis can design the antenna of different center frequency point.When the antenna overall dimensions becomes big, the corresponding reduction of center of antenna frequency, and among a small circle in the bandwidth of antenna also remain unchanged (bandwidth of antenna is substantially at 100MHz) during variation.As when antenna zooming parameter sca is 0.7, promptly antenna is of a size of 0.7 times of original size, and this moment, the center frequency point of antenna was 2.42GHz.The distributing point of antenna has the effect (as Fig. 6, shown in Figure 7) of fine setting to the frequency of antenna, after this makes that antenna completes, can the frequency to antenna adjust under the prerequisite that does not change the Antenna Design parameter, realizes being applied to the antenna of different frequency.
The feed port voltage standing wave ratio of the antenna that the present invention discussed is consistent with the determined bandwidth of antenna return loss less than 1.5 bandwidth, and the matching performance of antenna is good.The Smith circle diagram of antenna feed impedance as shown in Figure 8, input impedance at frequency 2.45G place is (45.56 ohm,-1.046j ohm), ignoring under the approximate condition of minimum imaginary impedance-1.046 ohm the impedance of 45.56 ohm of 50 ohm of patterns of pure resistance that quite have been near the mark of real part.Radiation efficiency that obtains and whole system effectiveness have all reached higher 99.51% and 99.29% respectively.The impedance matching that this shows described antenna is very good.Have compatiblely preferably in the wireless module of from now on human implantable, this is because human body is less to the antenna rejection property of ceramic dielectric and gold-plated surface.And the frequency adjustable of antenna is very good, is fit to research and actual engineering and makes, and this antenna will be to be applicable to very much the small sized wide-band communication equipment.
Claims (2)
1. microstrip antenna structure, this structure belongs to the standing wave type microstrip slot antenna, comprises that single face covers aerial panel and cable feeder line that the copper medium substrate is made, is characterized in that, described microstrip slot antenna is the centrosymmetric arc irradiation structure that continuous slit, rectangle right angle constitutes; Described cable feeder line is the coaxial cable that the end is connected with sub-miniature A connector, and it is connected on the aerial panel really allocation A, B two places and draws outside aerial panel.
2. the pairing parameter optimization method of adjustment of microstrip antenna structure according to claim 1 is characterized in that, operation as follows, and A) respectively to the actual size parameter X of antenna, a, b, c is optimized design by the requirement of satisfying antenna gain; B) standard of adjusting as parameter optimization with the jamming performance of being tested; C) distributing point of adjustment antenna is realized the adjustment of center of antenna frequency.
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| CN200910082135A CN101533958A (en) | 2009-04-16 | 2009-04-16 | Microstrip antenna structure and optimal adjustment method |
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| CN200910082135A CN101533958A (en) | 2009-04-16 | 2009-04-16 | Microstrip antenna structure and optimal adjustment method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306865A (en) * | 2011-05-23 | 2012-01-04 | 清华大学 | Method for changing center frequency of filter with superconducting microstrip structure by adopting mask overlay |
| CN109557432A (en) * | 2018-11-30 | 2019-04-02 | 西安电子科技大学 | A kind of method for measurement of partial discharge |
| CN109557382A (en) * | 2018-11-30 | 2019-04-02 | 西安电子科技大学 | A kind of electromagnetic radiation measuring method |
| CN113629394A (en) * | 2021-08-31 | 2021-11-09 | 山东炎一智能科技有限公司 | Method and device for adjusting central frequency point frequency of antenna |
-
2009
- 2009-04-16 CN CN200910082135A patent/CN101533958A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306865A (en) * | 2011-05-23 | 2012-01-04 | 清华大学 | Method for changing center frequency of filter with superconducting microstrip structure by adopting mask overlay |
| CN109557432A (en) * | 2018-11-30 | 2019-04-02 | 西安电子科技大学 | A kind of method for measurement of partial discharge |
| CN109557382A (en) * | 2018-11-30 | 2019-04-02 | 西安电子科技大学 | A kind of electromagnetic radiation measuring method |
| CN113629394A (en) * | 2021-08-31 | 2021-11-09 | 山东炎一智能科技有限公司 | Method and device for adjusting central frequency point frequency of antenna |
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Application publication date: 20090916 |