A Low Profile Antenna with Ultra-wideband Low Radar Cross Section Characteristic Based on Coding Metasurface


Cihan E. F., Kopar M., Ercek E., Sabah C.

15th European Conference on Antennas and Propagation, EuCAP 2021, Düsseldorf, Germany, 22 - 26 March 2021 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.23919/eucap51087.2021.9411161
  • City: Düsseldorf
  • Country: Germany
  • Middle East Technical University Affiliated: Yes

Abstract

© 2021 EurAAP.In this article, we propose a design of aperture coupled antenna with ultra-wideband low radar cross section (RCS) characteristics for X band applications. The RCS reduction ranging from 8 to 24 GHz has been realized with two novel artificial magnetic conductor (AMC) unit cells that are placed around the patch antenna. The AMCs have been designed with a 180 ± 38° phase difference within a frequency range in order to provide an effective phase cancellation. The proposed antenna's operating bandwidth is 8.9-9.8 GHz, corresponding to an impedance bandwidth of 9.6%, and the RCS reduction is mainly in the Ku band. The maximum out-of-band RCS reduction is 37 dB at 12.7 GHz, while the maximum in-band RCS reduction is 27 dB at 9.2 GHz. The monostatic RCS results of the reference antenna and proposed antenna have been investigated under both θ and -polarized plane wave incidence.