CN105281040A - Log periodic antenna - Google Patents
Log periodic antenna Download PDFInfo
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- CN105281040A CN105281040A CN201510678842.7A CN201510678842A CN105281040A CN 105281040 A CN105281040 A CN 105281040A CN 201510678842 A CN201510678842 A CN 201510678842A CN 105281040 A CN105281040 A CN 105281040A
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- antenna
- central tube
- logarithm periodic
- periodic antenna
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Abstract
The invention provides a log periodic antenna which comprises at least two antenna units and a feeding assembly, wherein each antenna unit comprises a central tube and a plurality of n-shaped oscillators, the plurality of n-shaped oscillators are coupled to the two sides of the central tube in a staggered manner, the two antenna units are in mirror symmetry, the central tubes of the two antenna units are in parallel and are opposite to each other, and the feeding assembly is coupled with the two antenna units respectively. In the log periodic antenna, a single oscillator is substituted by the n-shaped oscillators, the original linear structure of the single oscillator is formed to be similar to a face-shaped top end loading structure, and thus, the transverse length is shortened; and moreover, the n-shaped oscillators are connected with an assembly line via two points, the structural reliability is enhanced, and the log periodic antenna is particularly and suitably used for installation of a platform with relatively high vibration.
Description
Technical field
The present invention relates to antenna technology, particularly relate to a kind of logarithm periodic antenna.
Background technology
Along with the development of radar, the communication technology, radar, communication equipment equipment is with on various carrier, but consider that the quantity that carrier is installed gets more and more, bring carrier outer surface limited space and the numerous contradiction of antenna amount, strongly limit radar, the applying of the communication technology.
Solving the modal method of this contradiction is exactly antenna miniaturization and broadband, and miniaturization can reduce the installing space of single pair of antenna, thus ensures whole carrier can load abundant antenna; Broadband is realize by the bandwidth of enhancing antenna the instructions for use that one pair of antenna can meet multiple frequency range system.Logarithm periodic antenna is at present conventional ultra-wideband antenna, and it has extremely wide bandwidth, go for sharing of multiple frequency range system, but the size of its transverse direction is comparatively large, have impact on its use on carrier; In addition, conventional logarithmic periodic antenna adopts simple oscialltor form, and carrier vibration is comparatively large on antenna impact, needs to do the reinforcement of a lot of structural member for structure.
Summary of the invention
The object of the invention is to provide a kind of logarithm periodic antenna, is intended to solve conventional logarithmic periodic antenna and adopts simple oscialltor form, the problem that complex structure, reliability are low.
The invention provides a kind of logarithm periodic antenna, comprise at least two antenna elements and a feed assembly, described antenna element comprises central tube and staggered multiple " Π " type oscillator being coupled to these central tube both sides, two described antenna element specular, and the central tube of two described antenna elements is parallel just right, described feed assembly couples with two described antenna elements respectively.
By adopting " Π " shape oscillator to replace simple oscialltor in above-mentioned logarithm periodic antenna, the linear structure of original simple oscialltor being defined and is similar to planar top loading structure, thus shortening lateral length; In addition, " Π " shape oscillator is connected with assembly line by 2, enhances structural reliability, is particularly suitable for vibrating installing and using of larger platform.
Accompanying drawing explanation
Fig. 1 be in present pre-ferred embodiments logarithm periodic antenna face structural representation;
Fig. 2 is the side-looking structural representation of logarithm periodic antenna in present pre-ferred embodiments;
Fig. 3 is the structural representation of one of them antenna element in logarithm periodic antenna shown in Fig. 1;
Fig. 4 is the structural representation of feed element in logarithm periodic antenna shown in Fig. 2.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, a kind of logarithm periodic antenna 100 in present pre-ferred embodiments, the feed assembly 120 comprising at least two antenna elements 110 (comprising 110A and 110B) and couple with radio frequency connector 200.
Each antenna element 110 comprises central tube 111 and staggered multiple " Π " type oscillator 112 being coupled to these central tube 111 both sides, two described antenna element 110A and 110B specular, and the central tube 111 of two described antenna element 110A with 110B is parallel just right, described antenna element 110A and 110B couples described feed assembly 120 with two respectively.With reference to figure 2, radio frequency connector 200 is fixed on one end of the central tube 111 of two antenna element 110A and 110B.In two antenna element 110A and 110B, one of them 110A rotates 180 ° by another 110B along the central axis of its central tube 111 (1-1-2) and is symmetrically formed, more jointly forms the radiant body of logarithm periodic antenna 100 with another 110B after the translation of oscillator sheet normal orientation certain distance.
Refer to Fig. 1 and Fig. 3, the volume size of multiple " Π " type oscillator 112 on each antenna element 110 reduces step by step with scale factor τ, and arrange successively from one end of described central tube 111 to the other end, wherein, 0 < τ < 1.More specifically, maximum " Π " type oscillator 112 is arranged on the one end near radio frequency connector 200.
In the present embodiment, described " Π " type oscillator 112 comprise first radiant body 1122 parallel with described central tube 111 and two second radiant bodies, 1124, two described second radiant bodies 1124 of being connected between described central tube 111 and described first radiant body 1122 arranged in parallel.
Wherein in an embodiment, two relative distances away from two ends of " Π " type oscillator 112 of specular on two described antenna element 110A with 110B, namely the length of the second radiant body 1124 reduces step by step with scale factor α, wherein 0 < α < 1.More specifically, described " Π " type oscillator 112 of two specular away from the distance relation at two ends is relatively: Ln=α
n-1* L1, wherein, L1 is the relative numerical value maximum away from the distance at two ends of two " Π " type oscillators 112, and n is constant (relatively encoding successively from big to small away from the distance at two ends with two " Π " type oscillators 112), and n>=2.More specifically, " Π " type oscillator 112 that the length of the second radiant body 1124 is maximum is arranged on the one end near radio frequency connector 200.
Wherein in an embodiment, the distance of the geometric center of two on each antenna element 110 adjacent " Π " type oscillators 112 reduces step by step with scale factor β, wherein, and 0 < β < 1.More specifically, the distance relation of the geometric center of two adjacent described " Π " type oscillators 112 is: Di=β
i-1* D1, wherein, D1 is the maximum numerical value of the distance of " Π " type oscillator 112 geometric center described in two, and i is constant (encoding successively from big to small with the distance of described geometric center), and i>=2.More specifically, two " Π " type oscillators 112 that the distance of geometric center is maximum are arranged on the one end near radio frequency connector 200.
Wherein in an embodiment, the length of the first radiant body 1122 on " Π " type oscillator 112 reduces step by step with scale factor γ, and arrange successively from one end of described central tube 111 to the other end, wherein, 0 < γ < 1.More specifically, the length relation of described first radiant body 1122 is: Am=γ
m-1* A1, wherein, A1 is the length of described first radiant body 1122 grown most, and m is constant (encoding successively from big to small with the length of described first radiant body 1122), and m>=2.
In another embodiment, the starting most of logarithm periodic antenna 100 (the longest, near radio frequency radiator) a pair oscillator (two " Π " type oscillators 112 that mirror image is relative) total length is L1, thereafter oscillator is followed successively by L2 ~ Ln (n is that oscillator is to numbering from big to small) to length, and its length relation is: Ln=τ
n-1* L1 (value of τ is 0.01 ~ 0.99); The center distance of first pair and second pair oscillator is D1, and the spacing of each pair of oscillator is thereafter respectively D2 ~ Dn-2, D1=σ * L1 (value of σ is 0.01 ~ 0.99), Dn-2=τ
n-1* D1.
It should be noted that, above-mentioned parameter τ, α, β, γ get identical numerical value, also can be different.And if parameter n, m, i in same embodiment, should be get identical numerical value.
Refer to Fig. 2 and Fig. 4, described feed assembly 120 comprises coaxial cable 121 and feed tab 122.Coaxial cable 121 comprises heart yearn 1211, (insulation) dielectric layer 1212, outer conductor 1213 and overcoat (scheming not shown) from the inside to the outside.Coaxial cable 121 and radio frequency connector 200 couple, be contained in the central tube 111 of antenna element 110A described in one of them, make its outer conductor 1213 be coupled to the central tube 111 of the antenna element 110A other end relative with radio frequency connector 200, heart yearn 1211 passes this central tube 111 other end relative with radio frequency connector 200.The heart yearn 1211 of feed tab 122 one end and described coaxial cable 121 couples, the other end is coupled on the central tube 111 of antenna element 110B described in another, with the relative other end of described radio frequency connector 200.
Coaxial cable 121 and radio frequency connector 200 are assembled, then the outer conductor 1213 of coaxial cable 121 end and dielectric layer 1212 is peelled off, only leave heart yearn 1211.Slice off one section of outer conductor 1213 along the end exposing heart yearn 1211 again, retain dielectric layer 1212 and heart yearn 1211, just can obtain feed assembly 120.The outer conductor 1213 of coaxial cable 121 is electrically connected with the top of central tube 111 in the place near the dielectric layer 1212 exposed, should ensure during electrical connection that the dielectric layer 1212 exposed exposes the end face of one of them antenna element 110A completely, and outer conductor 1213 exposes minimum.Coaxial cable 121 is installed in the central tube 111 of one of them antenna element 110A, and the central tube 111 that outer conductor 1213 is installed on wherein with it is connected, and central tube 111 end is electrically connected with the outer conductor 1213 exposing proximate dielectric; The mounting flange of radio frequency connector 200 is connected with the other end end of central tube 111; The heart yearn 1211 of coaxial cable 121 is connected with antenna element 110B described in another by feed tab 122, and tie point is positioned at the end of its central tube 111.
By adopting " Π " shape oscillator to replace simple oscialltor in the present invention, the linear structure of original simple oscialltor being defined and is similar to planar top loading structure, thus shortening lateral length; In addition, " Π " shape oscillator is connected with assembly line by 2, enhances structural reliability, is particularly suitable for vibrating installing and using of larger platform.
In addition, " Π " of the present invention shape oscillator logarithm periodic antenna 100, adopt the oscillator sheet of a pair specular to combine, the logarithm periodic antenna 100 of formation has the advantage that frequency range is wide, miniaturized, structural reliability is high.Antenna is applicable to the broadband of radar or communication use, miniaturized reception, transmitting antenna, contributes to a fairly large number of problem of resolved vector mounted antennas; The high structural reliability of antenna is applicable to the stronger application scenario of vibration condition; This antenna structure is simple, is convenient to debugging, is applicable to carrying out through engineering approaches popularization.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a logarithm periodic antenna, it is characterized in that, comprise at least two antenna elements and a feed assembly, described antenna element comprises central tube and staggered multiple " ∏ " type oscillator being coupled to these central tube both sides, two described antenna element specular, and the central tube of two described antenna elements is parallel just right, described feed assembly couples with two described antenna elements respectively.
2. logarithm periodic antenna as claimed in claim 1, it is characterized in that, the volume size of multiple " ∏ " type oscillator on described antenna element reduces step by step with scale factor τ, and arrange successively from one end of described central tube to the other end, wherein, 0 < τ < 1.
3. logarithm periodic antenna as claimed in claim 1 or 2, it is characterized in that, on two described antenna elements, two " ∏ " type oscillators of specular reduce with scale factor α step by step away from the distance at two ends relatively, wherein 0 < α < 1.
4. logarithm periodic antenna as claimed in claim 3, it is characterized in that, described " ∏ " type oscillator of two specular away from the distance relation at two ends is relatively: Ln=α
m-1* L1, wherein, L1 be two " ∏ " type oscillators relatively away from the numerical value that the distance at two ends is maximum, n is constant, and n>=2.
5. logarithm periodic antenna as claimed in claim 1 or 2, it is characterized in that, the distance of the geometric center of two on described antenna element adjacent " ∏ " type oscillators reduces step by step with scale factor β, wherein, and 0 < β < 1.
6. logarithm periodic antenna as claimed in claim 5, is characterized in that, the distance relation of the geometric center of two adjacent described " ∏ " type oscillators is: Di=β
i-1* D1, wherein, D1 is the maximum numerical value of the distance of " ∏ " type oscillator geometric center described in two, and i is constant, and i>=2.
7. logarithm periodic antenna as claimed in claim 1 or 2, it is characterized in that, two second radiant bodies that described " ∏ " type oscillator comprises first radiant body parallel with described central tube and is connected between described central tube and described first radiant body, two described second radiant bodies are arranged in parallel.
8. logarithm periodic antenna as claimed in claim 7, it is characterized in that, the length of the first radiant body on described " ∏ " type oscillator reduces step by step with scale factor γ, and arrange successively from one end of described central tube to the other end, wherein, 0 < γ < 1.
9. logarithm periodic antenna as claimed in claim 3, it is characterized in that, the length relation of described first radiant body is: Am=γ
n-1* A1, wherein, A1 is the length of described first radiant body grown most, and m is constant, and m>=2.
10. logarithm periodic antenna as claimed in claim 1 or 2, it is characterized in that, described feed assembly comprises:
Coaxial cable, couples with radio frequency connector, is contained in the central tube of antenna element described in one of them, and the central tube of its outer conductor and described antenna element is coupled, and heart yearn passes this central tube;
Feed tab, the heart yearn of one end and described coaxial cable couples, and the other end is coupled on the central tube of antenna element described in another, the other end relative to described radio frequency connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510678842.7A CN105281040A (en) | 2015-10-19 | 2015-10-19 | Log periodic antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510678842.7A CN105281040A (en) | 2015-10-19 | 2015-10-19 | Log periodic antenna |
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| CN105281040A true CN105281040A (en) | 2016-01-27 |
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| CN201510678842.7A Pending CN105281040A (en) | 2015-10-19 | 2015-10-19 | Log periodic antenna |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1221828A (en) * | 1968-04-19 | 1971-02-10 | Marconi Co Ltd | Improvements in or relating to aerial systems |
| US4152706A (en) * | 1977-12-27 | 1979-05-01 | The United States Of America As Represented By The Secretary Of The Army | Log periodic zig zag monopole antenna |
| CA2260380C (en) * | 1999-01-26 | 2000-12-26 | James Stanley Podger | The log-periodic staggered-folded-dipole antenna |
| US20110205138A1 (en) * | 2010-02-25 | 2011-08-25 | Fujitsu Component Limited | Antenna device |
| CN103259077A (en) * | 2012-02-16 | 2013-08-21 | 中国科学院国家天文台 | Broadband double circular polarization feed source of radio heliograph |
| CN204441454U (en) * | 2015-01-07 | 2015-07-01 | 深圳信息职业技术学院 | Sheet logarithm antenna element and logarithm periodic antenna thereof |
| CN104868223A (en) * | 2015-05-27 | 2015-08-26 | 苏州科锐恒机械科技有限公司 | Steady type communication base station signal tower |
-
2015
- 2015-10-19 CN CN201510678842.7A patent/CN105281040A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1221828A (en) * | 1968-04-19 | 1971-02-10 | Marconi Co Ltd | Improvements in or relating to aerial systems |
| US4152706A (en) * | 1977-12-27 | 1979-05-01 | The United States Of America As Represented By The Secretary Of The Army | Log periodic zig zag monopole antenna |
| CA2260380C (en) * | 1999-01-26 | 2000-12-26 | James Stanley Podger | The log-periodic staggered-folded-dipole antenna |
| US20110205138A1 (en) * | 2010-02-25 | 2011-08-25 | Fujitsu Component Limited | Antenna device |
| CN103259077A (en) * | 2012-02-16 | 2013-08-21 | 中国科学院国家天文台 | Broadband double circular polarization feed source of radio heliograph |
| CN204441454U (en) * | 2015-01-07 | 2015-07-01 | 深圳信息职业技术学院 | Sheet logarithm antenna element and logarithm periodic antenna thereof |
| CN104868223A (en) * | 2015-05-27 | 2015-08-26 | 苏州科锐恒机械科技有限公司 | Steady type communication base station signal tower |
Non-Patent Citations (2)
| Title |
|---|
| SEUNG YOON YANG 等: "Sub-THz printed log-periodic dipole array antenna for enhanced bandwidth and high gain", 《THE 40TH EUROPEAN MICROWAVE CONFERENCE》 * |
| 张小林 等: "对数周期曲线振子天线的分析与设计", 《电波科学学报》 * |
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Application publication date: 20160127 |