Cancellation of High Cross-polarization of an Offset Parabolic Reflector Antenna using a Rectangular Matched Feed

Abstract

This paper presents the design and the experimental results of a dual-mode rectangular-matched feed. This type of feed cancels the unwanted high cross-polarization generated by the offset parabolic reflector antenna. In order to design this feed, higher order TE₁₁ mode has been added in correct amplitude and phase with the fundamental TE₀₁ mode in a rectangular structure. The proposed feed was then used as a primary feed to illuminate a linearly polarized offset parabolic reflector antenna. Through experimental results, it is verified that such a feed suppresses the undesired high cross-polarization introduced by the offset geometry of an offset reflector antenna. This kind of feed is very much suitable for monopulse tracking radar.

Keywords:

• Cross-polarization
• Matched feed
• Monopulse tracking radar
• Offset parabolic reflector antenna
• Return-loss

Additional information

Notes on contributors

Dhaval Pujara

Dhaval Pujara was born in Gujarat, India, in year 1974. He received B. E. degree in Electronics Engineering in 1996, M. Tech. degree in Electronics & Engineering (Microwaves & Radar) in 2002 from the Indian Institute of Technology (IIT), Roorkee and Ph. D. degree from Nirma University. During the year 2007–2009, he was deputed to Space Applications Centre (SAC), Indian Space Research Organization (ISRO), Ahmedabad, India for carrying out research on ‘Antennas for Satellite Applications’. Currently, Dr. Pujara is a Professor with the Department of Electronics & Communication Engineering, Institute of Technology, Nirma University, Ahmedabad, India.

Prof. Dhaval Pujara has been awarded as the ‘Best Engineering College Teacher’ of the Gujarat state by the Indian Society for Technical Education (ISTE) in year 2004 for his outstanding contribution to the academic community and the students. He has also won ‘The Young Scientist Award’ in the year 2011 by International Union of Radio Science (URSI). His areas of interest include antenna design for space applications, RF circuit design, etc. E-mail: [email protected]

S. B. Chakrabarty

S. B. Chakrabarty Soumyabrata Chakrabarty was born on January 03, 1966 in Karimganj district of Assam. He obtained his B. E. (Hons) degree from Gauhati University in 1988, M. E. from Jadavpur University in the year 1992 both in Electronics and Telecommunication Engineering and Ph. D. degree in Engineering from Indian Institute of Technology, Kharagpur in the year 1996. He is currently working in Antenna Systems Area, Space Applications Centre, Ahmedabad as senior Scientist/Engineer and Divisional Head, Microwave Sensors Antenna Division. He is involved in the development of antennas related to Microwave remote sensing and his areas of interest are Computational Electromagnetics, microwave and millimeter-wave antennas. E-mail: [email protected]