Double-ellipse helical antenna

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...

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

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