A Wide Bandwidth Beam Circularly Polarized Quadrifilar Helical Antenna

Abstract

The invention discloses a wide-bandwidth beam circularly polarized four-arm helical antenna, which includes a radiation body and a feed network; the radiation body is composed of four helical arms printed on a flexible dielectric board; each helical arm consists of a main arm and a parasitic arm, and the top of the main arm and the parasitic arm in each spiral arm is connected by a metal sheet; each main arm is composed of a top metal sheet, a middle metal sheet and a bottom metal sheet sequentially connected; wherein, the bottom metal The width of the sheet and the top metal sheet are the same and are wider than the middle metal sheet. The invention has flexible design, can realize high gain in wide frequency band, has good circular polarization performance, compact structure, light weight and easy processing, and is very suitable as a portable terminal in the field of communication or navigation.

Description

technical field [0001] The invention relates to a wide-bandwidth beam circularly polarized four-arm helical antenna in the field of communication and navigation, and is particularly suitable for the design of a high-performance portable antenna in the field of mobile satellite communication and navigation. Background technique [0002] Due to the advantages of wide beam width, good front-to-back ratio, and excellent wide-angle circular polarization performance, the quadrifilar helical antenna is very suitable for satellite communication and navigation. However, communication and navigation antennas usually require dual-frequency or multi-frequency operation, while the ordinary quadrifilar helical antenna is a resonant antenna with a narrow bandwidth, so its application range is relatively limited. In 2006, Yoann Letestu published an article Broadband Folded Printed Quadrifilar Helical Antenna on IEEE Transactions on Antennas and Propagation, proposing that the design of addi...

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Problems solved by technology

Its structural diagram is as figure 1 However, there are two defects in Yoann Letestu's design: one is that the working frequency band of the antenna is closely related to its diameter, height and number of circles, and only in some special structures can the antenna have a wider working frequency band; the other is The main arm and the parasitic arm are connected by a small connecting wire. Only when the connecting wire is thin to a certain extent can the antenna have a better standing wave. In the working frequency band of 1.2GHz-1.6GHz, the width of the connecting wire is only 0.5mm. If As the operating frequency increases, the connecting wire may be too thin, making it difficult to realize the processing technology, or it may be easily broken during use

The feed network makes it possible to apply the broadband quadrifilar helical antenna in portable terminals, but there are two defects: one is to increase the production cost; the other is that it is difficult to realize the integrated design of the feed network and the antenna

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