CN2836259Y - Dual log periodic antenna - Google Patents
Dual log periodic antenna Download PDFInfo
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- CN2836259Y CN2836259Y CN 200520079195 CN200520079195U CN2836259Y CN 2836259 Y CN2836259 Y CN 2836259Y CN 200520079195 CN200520079195 CN 200520079195 CN 200520079195 U CN200520079195 U CN 200520079195U CN 2836259 Y CN2836259 Y CN 2836259Y
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Abstract
The utility model discloses a kind of double-log periodic antenna, it relates to antenna technical field.The problem that solve mainly that existing vibrator type logarithm periodic antenna size is big, low, the phase center of gain changes with the variation of frequency longitudinally on its geometric center lines in the frequency band.The utility model has adopted the two parafacies T shape vibrator type logarithm periodic antenna made from T shape oscillator together, this two secondary T shape vibrator type logarithm periodic antenna is lined up 2 yuan of battle array structures of a cone-shaped, and be installed on the metal ground plate 16, its upper end is connected with (14) with metal intercell connector (13), with rigid coaxial cable (15) feed signal.Every secondary T shape vibrator type logarithm periodic antenna is formed by T shape oscillator 1,2,3,4,5,6,7, medium fixed head 8, metal supporting frames 9 and 10, dielectric support piece 11 and 12.The utility model can be widely used in fields such as communication, navigation, meteorological detection, nuclear detonation detection.
Description
Technical field
The utility model relates to antenna technical field, and specifically a kind of double-log periodic antenna is used for fields such as communication, navigation, meteorological detection, nuclear detonation detection.
Background technology
As the irrelevant antenna of a quefrency, logarithm periodic antenna is proposed in nineteen fifty-seven by D.H.DuHamel and D.E.Isbell, see D.H.DuHamel and D.E.Isbell, " BroadbandLogarithmically Periodic Antenna Structures; " IRE National ConventionRecord, pt.1, pp.119～128,1957.Most typical vibrator type logarithm periodic antenna be published in D.E.Isbell for the author technical paper " Log Periodic Dipole Arrays; " IRE Trans AntennasPropagation, Vol.AP-8, pp.260～267, among the May 1960, about the analysis of vibrator type logarithm periodic antenna and design can consult R.L.Carrel the doctorate paper " Analysis and Design ofthe Log-Periodic Dipole Antenna; " Ph.D.Dissertation, Elec.Eng.Dept., University of Illinois, 1961, University Microfilms, Inc., Ann Arbor, MI. in decades, logarithm periodic antenna has obtained widely using in actual engineering, it has become one of all channel antenna commonly used in the antenna works, existing ripe commercial product on the market.
According to C.A.Balanis, Antenna Theory:Analysis and Design, Second EditionJohn Wiley ﹠amp; Sons, Inc., the introduction of pp.559～560 in 1,997 one books, the gain of commercial vibrator type logarithm periodic antenna in 225～400MHz frequency range has only 5.5dBi.The lateral dimension of this antenna is decided according to operation wavelength, and operation wavelength is long more, and antenna size is just big more.In addition, the phase center of this antenna is not a fixing point, and its variation with frequency longitudinally on the geometric center lines of antenna changes, the corresponding working band of the little end of antenna size high-end, and the low side of the big corresponding working band of an end of antenna size.These drawbacks limit of existing commercial vibrator type logarithm periodic antenna product its range of application.
The utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, and a kind of double-log periodic antenna is provided, to solve the problem that frequency band is narrow, gain is low, antenna size is big that existing vibrator type logarithm periodic antenna exists.
The technical solution of the utility model is achieved in that
It at first designs single vibrator type logarithm periodic antenna according to the method for routine, in order to solve the big problem of antenna lateral dimension, straight line oscillator is wherein all become T shape structure, then two identical secondary T shape vibrator type logarithm periodic antennas are lined up 2 yuan of battle array structures of a cone-shaped, just constituted the utility model double-log periodic antenna.Specifically, the double-log periodic antenna comprises rigid coaxial cable, metal ground plate, metal intercell connector, two parafacies T shape vibrator type logarithm periodic antenna together.Two parafacies with T shape vibrator type logarithm periodic antenna line up 2 yuan of battle array structures of a cone-shaped, 2 yuan of battle array structures of this cone-shaped are installed on the metal ground plate, its upper end connects with metal intercell connector, uses the rigid coaxial cable feed signal.
Above-mentioned double-log periodic antenna, two parafacies T shape vibrator type logarithm periodic antenna together, every slave antenna is formed by T shape oscillator, medium fixed head, metal supporting frames, dielectric support piece.Each T shape oscillator all is divided into symmetrical two parts, is installed in respectively on the metal supporting frames; Metal supporting frames is connected and fixed with the medium fixed head; The dielectric support piece is installed in the lower end of metal supporting frames, the dielectric support piece is installed on the metal ground plate again, and the metal supporting frames upper end of two secondary T shape vibrator type logarithm periodic antennas connects with the metal intercell connector.
The utility model compared with prior art has following advantage:
1. antenna has very wide working band, and the relative band width has reached 67%;
2. antenna has been realized high-gain, and gain is greater than 8.5dBi in the frequency band;
3. the phase center of antenna is a fixing point, not with frequency change;
4. realized miniaturization on the antenna structure, volume is: length * wide * height=610 * 580 * 1200mm
3
5. antenna has reached following technical indicator:
Frequency range: 225～400MHz; Voltage standing wave ratio :≤2;
Gain: 8.5dBi; Horizontal plane 3dB lobe width: 〉=55 °;
Vertical plane 3dB lobe width: 〉=± 25 °; Polarised direction: perpendicular polarization;
Power capacity: 200W (continuous wave).
Owing to the utlity model has above-mentioned advantage, therefore have application value widely.It can be applicable to fields such as communication, detection.The broadband that is proposed, high-gain, miniature antenna technology can be applied in the design of other band antenna.
Description of drawings
Fig. 1 is that structure of the present utility model is formed schematic diagram
Fig. 2 is the voltage standing wave ratio test curve in the utility model frequency band
Fig. 3 a is the actual measurement E face directional diagram of the utility model 225MHz frequency
Fig. 3 b is the actual measurement H face directional diagram of the utility model 225MHz frequency
Fig. 4 a is the actual measurement E face directional diagram of the utility model 325MHz frequency
Fig. 4 b is the actual measurement H face directional diagram of the utility model 325MHz frequency
Fig. 5 a is the actual measurement E face directional diagram of the utility model 400MHz frequency
Fig. 5 b is the actual measurement H face directional diagram of the utility model 400MHz frequency
Embodiment
With reference to Fig. 1, it is that structure of the present utility model is formed schematic diagram.This antenna comprises metal ground plate 16, metal intercell connector 13,14, rigid coaxial cable 15 and two parafacies T shape vibrator type logarithm periodic antenna 17,18 together.This two parafacies with T shape vibrator type logarithm periodic antenna 17 with 18 under the parallel condition of the oscillator that keeps two element antennas, the spacing of short oscillator one end of two element antennas, spacing with respect to long oscillator one end is dwindled, and the latter's spacing increases, and lines up to constitute 2 yuan of battle array structures of a cone-shaped.2 yuan of battle array structures of this cone-shaped are installed on the metal ground plate 16, and its upper end is connected with 14 with metal intercell connector 13, usefulness rigid coaxial cable 15 feed signals, and the inner wire of rigid coaxial cable 15 is connected with metal intercell connector 14, and outer conductor is connected with metal intercell connector 13.Two parafacies T shape vibrator type logarithm periodic antenna 17 and 18 together, every slave antenna is formed by T shape oscillator 1,2,3,4,5,6,7, medium fixed head 8, metal supporting frames 9 and 10, dielectric support piece 11 and 12.Each T shape oscillator all is divided into the identical two parts in the left and right sides, is installed in respectively on metal supporting frames 9 and 10; Metal supporting frames 9,10 usefulness medium fixed heads 8 are connected and fixed; Dielectric support piece 11 and 12 is installed in the lower end of metal supporting frames 9,10 respectively, and is isolated two T shape oscillator logarithm periodic antennas and metal ground plate 16, the dielectric support piece is installed on the metal ground plate 16 again.This metal ground plate has utilized image theory, makes the phase center of two vibrator type logarithm periodic antennas be positioned at the center of metal ground plate 16 all the time, not with frequency change, has improved the front and back radiation ratio of antenna simultaneously significantly, has improved gain in the band of antenna.The design of above-mentioned T shape oscillator, it at first designs single vibrator type logarithm periodic antenna according to the method for routine, in order to solve the big problem of antenna lateral dimension, straight line oscillator is wherein all become T shape structure, each T shape oscillator all is made up of trailing arm and transverse arm respectively, and the span of the ratio of trailing arm length H and transverse arm length L is 0.4～0.65.Gain in the utility model antenna frequency band sees Table 1 with the data of comparative method for measuring.Standard antenna in the table 1 is the single logarithm periodic antenna of standard, and antenna to be measured is the double-log periodic antenna.
Table 1
| Frequency (MHz) | Antenna incoming level to be measured (dB) | Standard antenna incoming level (dB) | Standard antenna gain (dB) | Antenna gain to be measured (dBi) |
| 225 | -30.0 | -33.0 | 5.5 | 8.5 |
| 325 | -31.2 | -34.3 | 5.5 | 8.6 |
| 400 | -37.0 | -40.1 | 5.5 | 8.6 |
Electrical property of the present utility model can be given reflection by the E face of following test curve and actual measurement and the directional diagram of H face:
Fig. 2 is the voltage standing wave ratio test curve in the utility model frequency band.The voltage standing wave ratio test result shows, antenna in 225～400MHz frequency band voltage standing wave ratio all less than 1.9;
Fig. 3 a and Fig. 3 b have provided actual measurement E face and the H face directional diagram of antenna at the 225MHz frequency respectively;
Fig. 4 a and Fig. 4 b have provided actual measurement E face and the H face directional diagram of antenna at the 325MHz frequency respectively;
Fig. 5 a and Fig. 5 b have provided actual measurement E face and the H face directional diagram of antenna at the 400MHz frequency respectively.
Show that from above E face and H surface radiation directional diagram test result antenna has satisfied directional diagram and covered requirement in frequency band.
Claims (2)
1, a kind of double-log periodic antenna, comprise rigid coaxial cable (15), metal ground plate (16), metal intercell connector (13) and (14), it is characterized in that also comprising two parafacies T shape vibrator type logarithm periodic antenna (17), (18) together made from T shape oscillator, this two parafacies T shape vibrator type logarithm periodic antenna is together lined up 2 yuan of battle array structures of a cone-shaped, and 2 yuan of battle array structures of cone-shaped are installed on the metal ground plate (16), its upper end is connected with (14) with metal intercell connector (13), with rigid coaxial cable (15) feed signal.
2, double-log periodic antenna according to claim 1, it is characterized in that two parafacies made with T shape oscillator with T shape vibrator type logarithm periodic antenna (17) and (18), every width of cloth antenna is by T shape oscillator (1), (2), (3), (4), (5), (6), (7), medium fixed head (8), metal supporting frames (9), (10), dielectric support piece (11) and (12) composition, each T shape oscillator all is divided into symmetrical two parts, is installed in respectively on metal supporting frames (9), (10); Metal supporting frames (9), (10) are connected and fixed with medium fixed head (8); Dielectric support piece (11) and (12) are installed in the lower end of metal supporting frames (9), (10) respectively,, again the dielectric support piece is installed on the metal ground plate (16).The metal supporting frames (9) of two secondary T shape vibrator type logarithm periodic antennas (17) and (18) and the upper end of (10) use metal intercell connector (14) to be connected with (13) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079195 CN2836259Y (en) | 2005-08-05 | 2005-08-05 | Dual log periodic antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079195 CN2836259Y (en) | 2005-08-05 | 2005-08-05 | Dual log periodic antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2836259Y true CN2836259Y (en) | 2006-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520079195 Expired - Fee Related CN2836259Y (en) | 2005-08-05 | 2005-08-05 | Dual log periodic antenna |
Country Status (1)
| Country | Link |
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| CN (1) | CN2836259Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769363A (en) * | 2020-07-01 | 2020-10-13 | 中国电子科技集团公司第三十六研究所 | Ultra-wideband constant-beam directional antenna |
-
2005
- 2005-08-05 CN CN 200520079195 patent/CN2836259Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769363A (en) * | 2020-07-01 | 2020-10-13 | 中国电子科技集团公司第三十六研究所 | Ultra-wideband constant-beam directional antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |