CN102509868A - Design method for improved ellipse patch ultra-wideband antenna based on micro strip feed - Google Patents
Design method for improved ellipse patch ultra-wideband antenna based on micro strip feed Download PDFInfo
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- CN102509868A CN102509868A CN2011103671536A CN201110367153A CN102509868A CN 102509868 A CN102509868 A CN 102509868A CN 2011103671536 A CN2011103671536 A CN 2011103671536A CN 201110367153 A CN201110367153 A CN 201110367153A CN 102509868 A CN102509868 A CN 102509868A
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Abstract
A design method for an improved ellipse patch ultra-wideband antenna based on micro strip feed, belongs to the technical filed of wireless communication, and relates to ultra-wideband plane antenna technology and microwave technology. A special paster antenna structure is designed by improving the state of the distribution of the current intensity of the rectangular microstrip antenna; the shape of the antenna structure is an intersecting part of an ellipse and a rotundity, and is designed by changing a series of parameters of the long half axis and the short half axis of the ellipse and the semidiameter of the rotundity, the design result can meet the ultra-wideband frequency band range 3.1GHz to 10.6GHz established by the Federal Communications Commission (FCC), and the echo loss of the antenna is less than 2 and the antenna has all direction property.
Description
Technical field
Design based on the oval paster ultra-wideband antenna of microstrip-fed modified model belongs to wireless communication technology field, relates to super-wide-band flat antenna technology and microwave technology.
Background technology
U.S. Federal Communications Committee (FCC) has passed through the regulation of permission Ultra-wideband Communication Technology (UWB:Ultra-wideband) civil nature in February, 2002; Aspects such as being radar, sensing, military communication is only limited in UWB The Application of Technology field before; Cancellation along with the civil nature restriction; The UWB technology will be widely used in commercialization, civil areas such as Vehicular radar system, digital communication and test macro and imaging system, become the strong contention scheme that following short distance high-speed radiocommunication system is realized.
Emerging UWB wireless communication technology has many challenges on the realization aspect, it is exactly one of them that the design of UWB antenna realizes.In the wireless communication system, the transmission of Information carrier is an electromagnetic wave, and transmission medium is an air dielectric, and antenna is realized guided electromagnetic wave and the electromagnetic mutual conversion in space, and IEEE is defined as antenna and is designed for radiation in the system and receives electromagnetic part.Antenna is as indispensable parts in the wireless communication system, and its structure type, performance requirement and system's self-technique characteristics and application scenario are closely related.UWB adopts the open 3.1-10.6GHz frequency range of FCC, and bandwidth is an allocated bandwidth maximum in the business communications system of land up to 7.5GHz, and therefore, the UWB signal has the characteristic of ultra broadband.In addition, the UWB system must have high data rate, low-power consumption and characteristic cheaply, and the requirement that this has just required to improve the UWB antenna must have the performance higher with respect to the narrowband systems antenna.
The development of ultra-wideband antenna is broadly divided into three phases, and early stage of development was in before the fifties in last century, and main application fields is a radio data system; Be the flourish period of ultra-wideband antenna the fifties in last century to the nineties, and proposed the design theory of multiple broadband and frequency-independent antenna this period, and be widely used in various types of communication system and the radar-probing system; Along with FCC removes the restriction to the use frequency range of civilian UWB equipment, the ultra-wideband antenna technology was promoted greatly and was developed so far the nineties in last century.
Continued to bring out some emerging super-wide-band flat antenna technology the nineties in last century, comprises ultra broadband plate monopole sub antenna, ultra-wideband printed monopole aerial, ultra-wideband printed slot antenna and super-wide-band flat antenna.1976, people such as G.Dubost proposed flat plate antenna structure, became the primary structure form of early stage super wide band plane single pole sub antenna.1992, people such as Honda proposed the disk monopole antenna on the basis of spherical monopole antenna, had obtained the impedance bandwidth greater than 8: 1.The researcher is a research direction with the impedance bandwidth of antenna mainly afterwards, has proposed the plate monopole antenna of various deformation such as ellipse, annular, circle, water droplet shape in succession, has increased the kind of broadband plate monopole sub antenna greatly.Antenna structure is compact not to lose the omnidirectional radiation characteristic simultaneously in order to make, and having occurred with the ground plane is the plane dipole antenna of mirror image, and people such as Thoms have proposed the disk dipole antenna.Dipole antenna generally need be made mirror image processing in practical application, thereby monopole antenna occurred, and it is littler that antenna size becomes.Though the radiating surface of early stage monopole antenna is the printing-type planar structure; But ground plane is vertical with the metal radiating surface; Its feeding classification is that the probe by the SMA interface is connected on the radiant body of antenna via the via on the ground plane; And the distance between radiant body and ground plane becomes one of key factor that influences impedance bandwidth, and entire antenna remains three-dimensional structure.
The monopole antenna of two dimension adopts printed board technique, need not adopt microstrip line or coplanar conductors feed structure mostly at via of ground-plane design.Early stage plane single pole sub antenna is the plane triangle monopole antenna of strip line feed, for further reducing volume, changes into again and is the feed microstrip line mode.The antenna structure that has occurred different shape subsequently in succession.Radiant body is that the monopole antenna design of circle is comparatively simple, and the lowest operating frequency of antenna can be adjusted through changing circular radius, and the impedance bandwidth of antenna can be optimized through changing the radiant body shape.If change radiant body into infundibulate, impedance bandwidth can reach 2: 1, changes bowtie-shaped, cross, u shape, heart into, impedance bandwidth rises to 3: 1～and do not wait at 3.4: 1; If radiant body is become the impedance bandwidth that circle, fan-shaped and ellipse etc. can further increase antenna.Regulate the distance between radiant body and the floor, can make the impedance bandwidth of circular monopole antenna reach 5: 1.Characteristics such as that plane single pole sub antenna has is simple in structure, omnidirectional radiation, volume is little, making is easy become the research object of present more mechanism.
Summary of the invention
The subject matter that the present invention will solve is to improve through the situation that rectangular microband paste antenna current strength is distributed; Designed a kind of special patch shape antenna structure; This shape is oval and circular part of completing a business transaction mutually; And design through changing series of parameters such as oval length semiaxis and circular radius, design result can reach the return loss of ultra broadband band limits 3.1～10.6GHz that FCC (FCC) formulates and antenna less than 2.
This method has combined transmission line design method and finite element algorithm, and the method for designing of utilization transmission line theory designs microstrip-fed part earlier, makes that the resistance value of feed microstrip line is 50 Ω, to reach impedance matching; Use FInite Element to calculate the CURRENT DISTRIBUTION of rectangular radiation patch antenna again, the part that the rectangular radiation patch CURRENT DISTRIBUTION is more weak cuts away, and the aerial radiation patch shape of design is completed a business transaction shape for oval with circle mutually, and its structure is seen Fig. 1; At last the paster structure of optimizing is combined with microstrip-fed structure, form based on the oval paster ultra-wideband antenna of microstrip-fed modified model, its structure is seen Fig. 2.The substrate model that adopts is the 4350B model, and dielectric constant is 3.48, and thickness is 1.52mm; Radiation patch and ground plate material are Gold plated Layer.
Radiation patch and microstrip-fed structure Design process are following:
1. utilize finite element algorithm, the part that the rectangular radiation patch CURRENT DISTRIBUTION is more weak cuts away the formation ellipse and completes a business transaction shape mutually with circle, under difference oval length semiaxis ratio and circular radius condition, calculates the bandwidth and the return loss of ultra-wideband antenna.
2. microstrip-fed structure is relevant with ground plate spacing h with micro belt line width W and microstrip line, and under different W/h, the characteristic impedance of calculating microstrip line makes it to reach the characteristic impedance coupling of 50 Ω.
3. integrating step 1 and 2 result obtain the structural parameters based on the oval paster ultra-wideband antenna of microstrip-fed modified model.
Beneficial effect of the present invention:
1. the band limits of antenna is 3.1～10.6GHz, reaches the ultra broadband standard.
2. the return loss of antenna can reach the use standard less than 2.
3. microstrip-fed impedance can reach 50 Ω, can with load matched.
The using value of this paper: the civilian and military field of high-speed wideband radio communication has a wide range of applications.
Description of drawings
Fig. 1: oval and circular radiation patch shape of completing a business transaction mutually, 1 is oval, and 2 are circle, and 3 are oval and circular radiation patch of completing a business transaction mutually.
Fig. 2: based on the oval paster ultra-wideband antenna of microstrip-fed modified model structure chart, 1 radiation patch, 4 is microstrip-fed, and 5 is substrate, and 6 is ground plate, and 7 is sub-miniature A connector.
Embodiment
Situation through rectangular microband paste antenna current strength is distributed is improved; A kind of special patch shape antenna structure has been proposed; This shape is oval and circular part of completing a business transaction mutually, and designs and make a kind of ultra broadband paster antenna through changing series of parameters such as oval length semiaxis and circular radius.
Rectangular microband paste antenna mainly is made up of paster metal radiant body, microstrip feed line, ground plate and thin dielectric-slab, and is as shown in the figure, the width W of patch antenna
pAnd length L
p, the structure of rectangular patch metal radiant body be come by the equivalence of the surface area of cylindrical radiant body like figure, r is the radius of cylinder, L
pBe cylindrical length, equivalent formula is: 2 π r * L
p=W
P* L
p,
λ
LThe wavelength that the minimum cutoff of antenna is corresponding, f
lBe the resonance frequency of antenna minimum point, the width of patch antenna and length are to f
lPlay conclusive effect.The width W of radiant body
p, length L
pAnd the radius r unit of cylinder is mm, f
lUnit be GHz, through above-mentioned equivalent transformation formula can be rough the size that calculates rectangular patch antenna.The operation principle of antenna is represented with its CURRENT DISTRIBUTION commonly used, uses HFSS12 software that rectangular microband paste antenna is carried out emulation, and simulation result is presented under the situation of low frequency, and heavy current mainly is distributed in the edge of paster, the top and the feeder line on floor; Under the situation of high frequency, electric current is bigger along the edge current that the metal floor length direction distributes, and therefore for reason given above the prototype of rectangular microband paste antenna is improved.According to analysis to the current strength distribution situation of rectangular patch under different frequency; Paster is improved to a kind of half elliptic and circular a kind of special shape of completing a business transaction mutually; First circle of this shape can effective optimization the CURRENT DISTRIBUTION of patch edges, ellipsoidal structure has been optimized the CURRENT DISTRIBUTION of the latter half structure of paster.Through to adjustment and the optimal design of parameter of elliptic parameter, make antenna can reach the standard (3.1GHz～10.6GHz) of ultra broadband with circle.
Claims (5)
1. based on the method for designing of the oval paster ultra-wideband antenna of microstrip-fed modified model; The structure that comprises radiation patch, microstrip-fed structure, the structure of ground plate; It is characterized in that satisfying the ultra broadband standard-required, microstrip-fed and the load omni-directional with aerial radiation that is complementary.
2. the method for designing based on the oval paster ultra-wideband antenna of microstrip-fed modified model according to claim 1 is characterized in that the structure of radiation patch satisfies the ultra broadband standard-required.
3. the method for designing based on the oval paster ultra-wideband antenna of microstrip-fed modified model according to claim 1 is characterized in that it is 50 Ω that microstrip-fed structure satisfies characteristic impedance.
4. the method for designing based on the oval paster ultra-wideband antenna of microstrip-fed modified model according to claim 1 is characterized in that the structure of ground plate satisfies the omni-directional of aerial radiation.
5. according to claim 1,2,3 or 4 described methods for designing based on the oval paster ultra-wideband antenna of microstrip-fed modified model; It is characterized in that satisfying under the ultra broadband standard-required, it is that 50 Ω and aerial radiation have omni-directional that microstrip-fed impedance and load are complementary.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932410A (en) * | 2016-05-09 | 2016-09-07 | 中山大学 | Ultra wide band plane directional radiation antenna |
| CN109935968A (en) * | 2019-04-18 | 2019-06-25 | 南京工业大学 | Double-loop double-frequency antenna |
| CN112490649A (en) * | 2020-11-09 | 2021-03-12 | 桂林电子科技大学 | Side-feed narrow ground broadband patch antenna and design method thereof |
| CN116995434A (en) * | 2023-08-22 | 2023-11-03 | 中铁隧道局集团有限公司 | Ultra-wideband antenna of ground penetrating radar |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752665A (en) * | 2010-01-21 | 2010-06-23 | 上海大学 | UWB (ultra wide band) antenna with band-stop characteristic |
| CN201845872U (en) * | 2010-11-04 | 2011-05-25 | 西北工业大学 | UWB (ultra wide band) monopole antenna with bandwidth of 2.3-20.1GHz |
| CN201887151U (en) * | 2010-10-28 | 2011-06-29 | 南京理工大学 | Ultra-wideband planar monopole antenna |
-
2011
- 2011-11-18 CN CN2011103671536A patent/CN102509868A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752665A (en) * | 2010-01-21 | 2010-06-23 | 上海大学 | UWB (ultra wide band) antenna with band-stop characteristic |
| CN201887151U (en) * | 2010-10-28 | 2011-06-29 | 南京理工大学 | Ultra-wideband planar monopole antenna |
| CN201845872U (en) * | 2010-11-04 | 2011-05-25 | 西北工业大学 | UWB (ultra wide band) monopole antenna with bandwidth of 2.3-20.1GHz |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932410A (en) * | 2016-05-09 | 2016-09-07 | 中山大学 | Ultra wide band plane directional radiation antenna |
| CN105932410B (en) * | 2016-05-09 | 2019-06-25 | 中山大学 | A kind of super wide band plane directional radiation antenna |
| CN109935968A (en) * | 2019-04-18 | 2019-06-25 | 南京工业大学 | Double-loop double-frequency antenna |
| CN112490649A (en) * | 2020-11-09 | 2021-03-12 | 桂林电子科技大学 | Side-feed narrow ground broadband patch antenna and design method thereof |
| CN116995434A (en) * | 2023-08-22 | 2023-11-03 | 中铁隧道局集团有限公司 | Ultra-wideband antenna of ground penetrating radar |
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Application publication date: 20120620 |