Phased Sub-arrays Pattern Synthesis Method with Deep Sidelobe Reduction and Narrow Beam Width

Abstract

Antenna arrays with low sidelobe patterns and high directivities are very desirable in practice and represent a key success for many communication systems such as radio telescopes, satellites, fifth-generation (5G) wireless communication systems, and high detection radars. To meet these features, a new array pattern synthesis method based on two uniformly sub-arrays controlled by a pre-specified power factor is presented. The proposed method includes the following steps: first, the outputs of those two scanned sub-arrays are added and subtracted to generate the sum and difference patterns, respectively. The sidelobe structures of these two generated patterns are nearly identical, then, an array pattern with greatly reduced sidelobes and narrowed beam width can be obtained by simply subtracting the difference pattern from the sum pattern. Simulation results show that the proposed array pattern with power factor, e = 0.5, can provide a sidelobe level about −32 dB (i.e. an improvement about −19 dB with compared to that of the corresponding fully uniform array). Moreover, the beam width of the proposed array has been greatly narrowed. Better results can be also obtained by controlling the scanned angles of the two sub-arrays.

KEYWORDS:

• Linear arrays
• Low sidelobe pattern synthesis
• Phased antennas
• Phased sub-arrays
• Uniform amplitude distribution

Additional information

Notes on contributors

Jafar Ramadhan Mohammed

Jafar Ramadhan Mohammed received the BSc and MSc degrees in electronics and communication engineering in 1998, and 2001, respectively, and the PhD degree in digital communication engineering from Panjab University, India in Nov 2009. He was a visiting lecturer in the Faculty of Electronics and Computer Engineering at the Malaysia Technical University Melaka (UTeM), Melaka, Malaysia in 2011 and Autonoma University of Madrid, Spain in 2013. He is currently an assistant professor and vice chancellor for Scientific Affairs at Ninevah University. He authored more than 50 papers in international refereed journals and conference proceedings. Also, he edited the book titled “Array Pattern Optimization” published by IntechOpen in 2019 and authored a chapter in the book titled “Modern Printed Circuit Antennas”, published by InTechOpen ISBN 978-1-83880-858-7 in 2020. His main research interests are in the area of digital signal processing and its applications, Antenna, and Adaptive Arrays. In 2011, He is listed in Marquis, Who’s Who in Science and Engineering (Edition 28). In 2018, he has been selected for the Marquis Who’s Who Lifetime Achievement Award.