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Double-ellipse helical antenna

A helical antenna and double elliptical technology, applied in the field of handheld mobile communication devices and helical antennas, can solve the problems of complex feeding structure, affecting antenna application, and large volume occupied by the antenna, and achieve simple feeding structure, high gain and volume. small effect

Inactive Publication Date: 2008-04-02
CITY UNIVERSITY OF HONG KONG
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] First, although the gain of the helical antenna can be increased by increasing the number of helical turns, the size of the helical antenna will increase with the increase of the number of turns. Currently, handheld mobile communication devices are developing towards a compact and highly integrated trend. Too many turns will reduce the Affect the application of antennas in the field of handheld mobile communication equipment;
[0005] Second, as shown in Figure 2 and Figure 3, although the method of using multiple helical coils on a helical antenna to increase the gain can increase the gain, the feed structure is quite complicated;
[0006] Third, because the conventional helical coil is usually circular, it will also lead to a relatively large volume of the antenna, especially when it is applied to a handheld device, it is difficult for the circular antenna to match the flat structure of most handheld mobile communication devices

Method used

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Embodiment Construction

[0028] According to the purpose of the present invention, the present invention uses two elliptical helical coils with different numbers of turns to form an antenna capable of radiating circularly polarized waves, and adopts a simple single-feed structure.

[0029] For the purpose of this invention, the present invention selects the geometric structure of the helical coil and the relative position of the main helical coil and the parasitic helical coil through theoretical analysis, so that the circular polarization 3dB axial ratio bandwidth is close to 40%. In addition, because the helical structure can be determined through theoretical analysis Therefore, the impedance conversion from the 50 ohm coaxial connector to the antenna input port can be realized with a simple matching structure, and the 10dB input impedance bandwidth can reach about 30%. The design idea of ​​the present invention is introduced in detail below:

[0030] (1) Select the spiral radius and the spacing betw...

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Abstract

The invention provides a double ellipse helical antenna, comprising a main ellipse helical coil, a medium basal plate, a matching circuit and a coaxial SMA adaptor, wherein, the double ellipse helical antenna also comprises a parasitical ellipse helical coil which is in coupling connection with the main ellipse helical coil. The double ellipse helical antenna has the advantages of relatively high gain, simple feeding structure and small volume, and is particularly applied to the hand-held mobile communication equipment.

Description

technical field [0001] The present invention relates to helical antennas, and more particularly to dual elliptical helical antennas. The invention is suitable for handheld mobile communication equipment. Background technique [0002] The axial mode helical antenna, as shown in Figure 1, is a circularly polarized antenna invented by Kraus in 1946. It has very unique advantages in receiving echo signals containing various possible polarization forms, and can greatly The receiving strength of the signal can be greatly improved, and the relative frequency bandwidth of the axial-mode helical antenna is about 30%, and its sensitivity to multipath propagation effects is low. In addition, the helical antenna has a simple structure and is easy to process, and is especially suitable for Mobile communication and satellite communication systems, and have been widely used in satellite communication base stations and other fields. There are a large number of reference materials at home a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/36H01Q9/04H01Q21/30
Inventor 容启宁车文荃符兵吴泽海刘沛儿陈锦源
Owner CITY UNIVERSITY OF HONG KONG
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