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International Journal of Antennas and Propagation
Volume 2019, Article ID 8230641, 7 pages
https://doi.org/10.1155/2019/8230641
Research Article

A New High-Performance Monopulse Feed with a Simple Comparator Network

1Department of Radio and Communications Engineering, Chungbuk National University, Cheongju City 26844, Republic of Korea
2Duta Technology Inc., Daejeon 34077, Republic of Korea

Correspondence should be addressed to Andrii Gorshkov; moc.liamg@vokhsrog.iirdna

Received 19 October 2018; Revised 21 March 2019; Accepted 18 May 2019; Published 27 June 2019

Academic Editor: Miguel Ferrando Bataller

Copyright © 2019 Nyambayar Jargalsaikhan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a new high-performance five-element monopulse feed with a simple comparator network for Cassegrain reflector applications. The radiating element is a tapered dielectric rod fed by a circular waveguide which is in turn excited by a printed dipole. The center element is used for the sum pattern, while top and bottom elements are used for the elevation difference pattern, and left and right elements for the azimuth difference pattern. Out-of-phase excitation for the difference pattern is obtained by antisymmetrically placing two dipoles and combining their outputs with a power combiner. The optimally designed feed has been fabricated and measured. Measurement shows that the feed has the maximum sum pattern gain of 16.8 dBi, the difference pattern null depth of –21 dBi, and the reflection coefficient of less than –10 dB over 13.9–16.7 GHz.