A New Impedance Matching Method for an Ultra-Wide Band and Dual Circularly Polarised Feed

Li, Sha, Yan, Yi Hua, Wang, Wei, Chen, Zhi Jun, Liu, Dong Hao, Zhang, Fu Shun and Jeffrey, Natasha (2016) A New Impedance Matching Method for an Ultra-Wide Band and Dual Circularly Polarised Feed. Publications of the Astronomical Society of Australia, 33. ISSN 1323-3580

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Abstract

In traditional antenna design, metal components are not placed in the central part of the antenna as they change the characteristics of near field radiation. However, we show that placing a metal ring in the centre of the strip lines, which connect the ends of folded high-frequency dipoles, does not damage the performance of the feed. Instead it significantly improves the voltage standing wave ratio of the feed whilst other performance indicators are not compromised. Thus, our findings show an excellent way of improving the wide band feed. Based on this foundation, a new circularly polarised feed for operation between 0.4 to 2 GHz is introduced for the Chinese Spectral Radioheliograph in this paper. The issue of a feed impedance matching network is investigated. By optimising the impedance matching, the performance of the feed is enhanced with respect to the previous realisations of the Eleven feed. The simulation and experimental results show that the gain of the feed is about 10 dBi, and the VSWR is less than 2:1. In addition, the feed has a low axial ratio, fixed phase centre location, and constant beam width in the range of 0.4 to 2 GHz.

Item Type:	Article
Uncontrolled Keywords:	Astronomical instrumentation, Methods and techniques, Methods: analytical
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Paul Burns
Date Deposited:	10 Sep 2019 10:56
Last Modified:	10 Oct 2019 15:30
URI:	http://nrl.northumbria.ac.uk/id/eprint/40621

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