CN85100243A - Vehicle-mounted broadband beam antenna - Google Patents
Vehicle-mounted broadband beam antenna Download PDFInfo
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- CN85100243A CN85100243A CN 85100243 CN85100243A CN85100243A CN 85100243 A CN85100243 A CN 85100243A CN 85100243 CN85100243 CN 85100243 CN 85100243 A CN85100243 A CN 85100243A CN 85100243 A CN85100243 A CN 85100243A
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- feeder line
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Abstract
A kind of vehicle-mounted broadband beam antenna, it is improved according to its operation principle and to be made on the basis of original Log Periodic Dipole Antenna.High band is the logarithm period structure, and low-frequency range is the best f that waits
N+1-f
NStructure, this antenna volume is little, again can be overhead, be applicable at vehicle-mounted mobile station and make dual-mode antenna that the antenna according to the design of the design's method also can be used in any case any polarization.This situation lower for frequency and the frequency band broad is undoubtedly very good antenna.
This antenna cost is low, and materials are few, and processing is simple.
Description
The invention belongs to the improvement of Log Periodic Dipole Antenna.
Operation principle and method for designing about Log Periodic Dipole Antenna, the data of existing many maturations, the image that also has some design logarithmically periodic dipole antennas to use, make the design of Log Periodic Dipole Antenna be tending towards ripe, and work afterwards mainly is the size of dwindling logarithm periodic antenna, with the improvement feed method, the article of relevant this respect on " Antenna ﹠ Radiao Waves " magazine, also translate carry many, as " logarithm periodic antenna of minification " that 1971 the 2nd phases carried out, the first phase in 1972 " was dwindled several technology of logarithm periodic antenna size " or the like.Its main method that reduces size is that oscillator is done various forms of loadings, and these all can only reduce lateral dimension, and the limited bandwidth of various loading forms.Also the someone mentions the longitudinal size that adopts big α angle (this angle youth's antenna axis and oscillator are not held the angle of being opened) can reduce antenna.But it is generally acknowledged that the α angle should not be greater than 30 °, the someone thought and must not surpass 45 ° at most afterwards, thereby had limited the minimum longitudinal size of antenna.The present invention is on the basis of original Log Periodic Dipole Antenna, is improved according to its operation principle and makes, and the broadband character of its existing logarithm periodic antenna makes that again antenna size reduces greatly, thereby overcome above-mentioned deficiency.
Accompanying drawing one is the structural front view of vehicle-mounted broadband beam antenna.1 is base plate among its figure, and 2,2 ' for dividing a feeder line, 3 be oscillator, 4 is 5 to be 6 to be the α angle, and 7 is thick folded dipole, and 8 is a thin folded dipole, and 9 is that antenna axis 10 is punching on the base plate, 11,11 ' be distributing point.
Accompanying drawing two is vertical views of the present invention.
Main points of the present invention are the parallel wires (2 on the base plate (1) with limited size, 2 ') as dividing feeder line, base plate is with 1 millimeter rolled lead, top punching (10), to prevent that winter, rainwater froze, accumulated snow is gained in weight, each oscillator all adopts the veneer folded dipole, folded dipole can be made with the pipe of two kinds of different-diameters, in the bending place seam, one thick (7) are connected with dividing feeder line, thin one (8) are connected with base plate, make the form that can fold at its root, oscillator all stands upright on the base plate, constitutes the one pole form of perpendicular polarization, and antenna axis (9) does not hold the angle α (6) that is opened to be the angle greater than 45 ° with oscillator, that root that main feeder is connected from first oscillator (3) divides the distributing point (11,11 ') that is punctured into the place ahead the pipe of feeder line (2) to sentence to exempt to cause anomalistic point.If anomalistic point is arranged, can be at the suitable short-circuit line in back of first oscillator of minute feeder line.Be connected with antenna lifter in that center of gravity place base plate is following, or add a simple rotation system and just be connected with elevating lever better.
When design, the α angle when the α angle can be obtained than optimum state is much bigger, even can surpass 45 °, up to about 48 °, but will obtain bigger X angle under the condition that guarantees gain.
On overall structure, the high band that centre frequency is above, keep the constant low-frequency range below centre frequency of logarithm period, with near a certain segment structure the centre frequency, by the linear ratio relation of frequency, rearrange the structure of low-frequency range, that is to say, if it is fN that the resonance frequency of an oscillator is arranged near centre frequency, be f in the resonance frequency of the oscillator in its front
N+1, then all press f in the difference of each adjacent vibration generators resonance frequency of low-frequency range
N+1-fNChoose, and their positions on minute feeder line are pressed f fully
N+1-fNThis similarity relation determines that antenna is smaller and even at entire belt wide region standing internal wave like this.
Logarithm periodic antenna, be non-antennaverter theoretically, that is with the antenna of frequency-independent, but in fact usually can only accomplish 6: 1 bandwidth, and utilize above-mentioned method for designing, can in very wide frequency range, guarantee technical indicator, that is to say that it can guarantee technical indicator in the much wide frequency band range than the logarithm period antenna, and the antenna size of making is very little, even has only 1/4th of logarithm periodic antenna optimum length, highly have only half of Log Periodic Dipole Antenna, the situation of this and frequency band broad lower, be undoubtedly very good antenna frequency.
This antenna volume is little, again can be overhead, use maneuverability, and be applicable to that vehicle-mounted mobile station makes dual-mode antenna, but, can be used in any case any polarization according to the antenna of the design's method design.
This antenna cost is low, and materials are few, and processing is simple.
Claims (4)
1, a kind of method for designing of vehicle-mounted broadband beam antenna, it utilizes the logarithm period structure at high band, it is characterized in that low-frequency range adopts the best f that waits
N+1-f
NPeriodic structure.
2, a kind of vehicle-mounted broadband beam antenna by oscillator, divides feeder line to form, and it is characterized in that oscillator all stands upright on the low plate, is connected with base plate with minute feeder line, and antenna axis (9) and oscillator do not hold the angle α (6) that is opened between 45 °～48 °.
3, according to claim 2 said antennas, it is characterized in that all oscillators all use a thick thin pipe to make the one pole folded dipole, thick one is connected with dividing feeder line, and thin one is connected with base plate.
4, according to claim 3 said antennas, it is characterized in that main feeder from one by one that root of being connected of oscillator (3) divide the distributing point (11) that is punctured into the place ahead in the pipe of feeder line (2), to avoid causing anomalistic point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100243 CN85100243A (en) | 1985-04-01 | 1985-04-01 | Vehicle-mounted broadband beam antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85100243 CN85100243A (en) | 1985-04-01 | 1985-04-01 | Vehicle-mounted broadband beam antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85100243A true CN85100243A (en) | 1986-07-09 |
Family
ID=4791002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85100243 Pending CN85100243A (en) | 1985-04-01 | 1985-04-01 | Vehicle-mounted broadband beam antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100243A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444865A (en) * | 2019-08-06 | 2019-11-12 | 南京邮电大学 | Log-periodic antenna based on artificial surface plasmon |
-
1985
- 1985-04-01 CN CN 85100243 patent/CN85100243A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110444865A (en) * | 2019-08-06 | 2019-11-12 | 南京邮电大学 | Log-periodic antenna based on artificial surface plasmon |
| CN110444865B (en) * | 2019-08-06 | 2021-10-29 | 南京邮电大学 | Log periodic antenna based on artificial surface plasmon polariton |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |