CN1780053A - Omnidirectional antenna radiant unit - Google Patents
Omnidirectional antenna radiant unit Download PDFInfo
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- CN1780053A CN1780053A CN 200410052409 CN200410052409A CN1780053A CN 1780053 A CN1780053 A CN 1780053A CN 200410052409 CN200410052409 CN 200410052409 CN 200410052409 A CN200410052409 A CN 200410052409A CN 1780053 A CN1780053 A CN 1780053A
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- conductor
- tube
- radiating element
- omnidirectional antenna
- antenna
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Abstract
A radiator unit for omnidirectional antenna is composed of a basic conductor tube and one or more external conductor tubes sleeving on said basic conductor tube. Its radiation terminal is the space between the end of said external tube(s) and the external surface of basic tube. The distance between two radiation terminal is 1/2 wavelength of central frequency. Its advantages are wider bandwidth and higher gain.
Description
[technical field]
The present invention relates to a kind of omnidirectional antenna radiating element.
[background technology]
The omnidirectional antenna radiating element is generally linear half-wave doublet.As Fig. 1, linear half-wave doublet is made of isometric arm 11 and arm 12 usually, and the locus of two arms is on same straight line, and every brachium is generally 1/4 λ
0(λ
0Be center wavelength frequently, down with), and at the centre feed of oscillator.The half-wave doublet gain is 2.15dB, and when constituting omni-directional array antenna with half-wave doublet, its structure has and feedback and series feed two kinds of structures (Fig. 2 and Fig. 3) usually.
As Fig. 2, be the unit of making shunt-fed antenna.In the middle of oscillator, use 13 pairs of oscillator feeds of coaxial cable.Because the influence of oscillator intermediate supports Metallic rod 14, the impedance operator of half-wave dipole alters a great deal, can not be with 50 Ω cable direct feeds, and antenna bandwidth sharply narrows down.If support with insulating material pipe without metal circular tube, feeder cable exerts an influence equally to radiating doublet, even influence is bigger.
As Fig. 3, be the unit 15 of making series fed antenna.Coaxial transmission line 17 outer conductors are cut out narrow slot to be come half-wave dipole is carried out feed.Spacing between the unit 15 and 16 is about the length of an active centre wavelength.Owing to be series feed structure, the length between the unit is fixed, and operating frequency low side and high-end wavelength are unequal, and phase delay is just different.Thereby cause the high-end antenna pattern of frequency low side and frequency not on same direction.Make the antenna frequency bandwidth characteristics very narrow like this.In addition, series fed antenna can't be easily to antenna pattern implement to go up secondary lobe suppresses and following zero point filling technique.
The mechanism of above-mentioned half-wave dipole radiation electric wave is the radiation that relies on the alternating current on the oscillator arms metal outer wall to produce.
Based on the omnidirectional antenna that the half-wave dipole radiating element constitutes, its bandwidth is generally about 10%.See Figure 10.
[summary of the invention]
The object of the present invention is to provide a kind of frequency band wideer, higher novel omnidirectional antenna radiating element gains.See Fig. 4, Fig. 5.
For realizing purpose of the present invention, omnidirectional antenna radiating element provided by the invention, include a conductor parent tube, described conductor parent tube radially is with the conductor outer tube more than one or outward, has the gap between two adjacent pipes, described gap is filled by dielectric, constitutes the port of radiating element between outer conductor tube end and the conductor parent tube outside wall surface.The spacing of two ports is about 1/2 λ., when when carrying out feed near 180 ° of the one or both ends phase phasic differences of port, the middle part of conductor tube is a point of zero voltage.Thereby also can conductor tube be coupled together with conductor, see Fig. 6.
The present invention utilizes port to constitute radiation mechanism and realizes the omnidirectional radiation characteristic, than having brought following benefit based on half-wave dipole and distortion oscillator omnidirectional radiation unit thereof:
1. innermost conductor parent tube is both as the parent tube of radiating element, again as the stay pipe of antenna and array antenna, constitute an important component part of radiating element, thereby improved the impedance operator of antenna greatly, make radiating element frequency bandwidth broadening greatly.When the omni-directional antenna arrays of using this omnidirectional radiation unit to form, can be convenient to use feeding classification in parallel, the frequency bandwidth that makes array antenna is broadening greatly, simultaneously can be by each radiating element amplitude and phase place are changed the figuration of realization to antenna pattern, as suppress minor level and following zero point and fill, thereby can realize control better to directional diagram than the omnidirectional antenna of linear symmetric oscillator.
2. spacing is about 1/2 λ between the radiating element two-port
0, have the effect of forming array between the port, thereby ratio of gains half-wave dipole has improved about 1dB.
When using the background radiation unit to form omni-directional antenna arrays, under equal gain, can make that antenna length is shorter.
As the further improvement of such scheme, can be provided with otch at the tube wall of metal outer pipe of the present invention, then the present invention has directionality, has above-mentioned the 1st, the 2nd described characteristics simultaneously.
[description of drawings]
Fig. 1 is the half-wave dipole schematic diagram of existing omnidirectional antenna radiating element;
Fig. 2 is the structure chart of the omni-directional antenna arrays unit of existing half-wave dipole employing and feedback mode;
Fig. 3 is the structure chart that existing half-wave dipole adopts the omni-directional antenna arrays unit of series feed mode;
Fig. 4 is the schematic perspective view of the embodiment of the invention 1;
Fig. 5 is the longitudinally cutting structural representation of the embodiment of the invention 1;
Fig. 6 is the longitudinally cutting structural representation of the embodiment of the invention 2;
Fig. 7 is the longitudinally cutting structural representation of the embodiment of the invention 3;
Fig. 8 is the transverse cross sectional structural representation of the embodiment of the invention 4;
Fig. 9 is the schematic perspective view of the embodiment of the invention 4;
Figure 10 is the measured data figure of the frequency bandwidth of the omnidirectional antenna that constitutes of existing half-wave dipole radiating element;
Figure 11 is the measured data figure of frequency bandwidth of the present invention.
[embodiment]
Embodiment one: with reference to figure 4 and Fig. 5, radiating element has three round metal tubes of radially coaxial socket in the present embodiment, the length of wherein innermost metal tube 1 is the longest, metal parent tube as radiating element, while is as the support metal pipe of antenna and array antenna, the metal tube 2 that is enclosed within metal tube 1 periphery is the radiation excitation pipe, and length is about 1/2 λ
0, metal tube 3 is a phost line, is enclosed within the periphery of metal tube 2, its length is shorter than metal tube 2.Have the annular gap between the two adjacent metal tubes, described gap is filled by dielectric 4 and medium 5. Metal tube 1,2,3 and medium 4,5, constituted the background radiation unit together.
Form the upper port 6 of radiating element and the spacing between 7, two ports of lower port between the two ends up and down of metal tube 2,3 and the metal parent tube outside wall surface respectively and be about 1/2 λ
0, distributing point is located near the position in the lower port 7, and encourages between metal tube 1 and metal tube 2.
Have the effect of forming array between the port 6,7, thereby ratio of gains half-wave dipole has improved about 1dB.When using the background radiation unit to form omni-directional antenna arrays, under equal gain, can make that antenna length is shorter.
Embodiment two: with reference to figure 6, at embodiment for the moment, when the position of distributing point when carrying out feed near the one or both ends of port, form zero potential at the middle part of metal tube, thereby metal tube connected together with conductor spare 18, see figure.
Embodiment three: with reference to figure 7, what present embodiment was different with the foregoing description is that it only is made up of metal tube 1 and metal tube 2, but has identical characteristic with the foregoing description.
Embodiment four: with reference to figure 8 and Fig. 9, what present embodiment and embodiment one were different is that the tube wall of its conductor tube 2,3 is provided with the slot cut 8 that extends vertically, makes radiating element have directionality like this, has the described characteristic of the foregoing description simultaneously.
Above-mentioned otch 8 is not limited to flute profile, can be the otch of Any shape.
Claims (5)
1, a kind of omnidirectional antenna radiating element, it is characterized in that: have a conductor parent tube, described conductor parent tube radially is with the conductor outer tube more than one or outward, constitute the port of radiating element between outer conductor tube end and the conductor parent tube outside wall surface, the distance between the two-port is about 1/2 centre frequency wavelength.
2, omnidirectional antenna radiating element according to claim 1 has the gap between wherein said adjacent two pipes, and this gap can be filled by air or medium.
3, omnidirectional antenna radiating element according to claim 1 when being zero potential in the middle part of wherein said conductor parent tube and the conductor outer tube, can be connected with conductor at the middle part of conduit.
4, omnidirectional antenna radiating element according to claim 1, the cross section of wherein said conductor parent tube and conductor outer tube can be an arbitrary shape, as: circle, polygon, ellipse or the like.
5, omnidirectional antenna radiating element according to claim 1, wherein said conductor tube tube wall can be provided with otch, and this otch also can be Any shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052409 CN1780053A (en) | 2004-11-24 | 2004-11-24 | Omnidirectional antenna radiant unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052409 CN1780053A (en) | 2004-11-24 | 2004-11-24 | Omnidirectional antenna radiant unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1780053A true CN1780053A (en) | 2006-05-31 |
Family
ID=36770226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410052409 Pending CN1780053A (en) | 2004-11-24 | 2004-11-24 | Omnidirectional antenna radiant unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1780053A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964497A (en) * | 2021-10-28 | 2022-01-21 | 江苏亨鑫科技有限公司 | Hidden null-fill omnidirectional antenna |
-
2004
- 2004-11-24 CN CN 200410052409 patent/CN1780053A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113964497A (en) * | 2021-10-28 | 2022-01-21 | 江苏亨鑫科技有限公司 | Hidden null-fill omnidirectional antenna |
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