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Characteristic mode-based compact circularly polarized metasurface antenna for in-band RCS reduction

Published online by Cambridge University Press:  11 September 2019

Puneeth Kumar Rajanna Open the ORCID record for Puneeth Kumar Rajanna [Opens in a new window] ,
Karthik Rudramuni  and
Krishnamoorthy Kandasamy
Puneeth Kumar Rajanna*
Affiliation:
Electronics and Communication, National Institute of Technology Karnataka, Srinivasanagar post, Surathkal, Mangalore, Surathkal, Karnataka, India
Karthik Rudramuni
Affiliation:
E&C, National Institute of Technology Karnataka, Surathkal, Karnataka, India
Krishnamoorthy Kandasamy
Affiliation:
E&C, National Institute of Technology Karnataka, Surathkal, Karnataka, India
*
Author for correspondence: Puneeth Kumar Rajanna E-mail: Puneeth.tc@gmail.com
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Abstract

This paper presents a novel design of a low profile circularly polarized (CP) metasurface (MTS) antenna with in-band radar cross-section (RCS) reduction property. The MTS is loaded as a superstrate on slot antenna and it can be viewed as a polarization-dependent MTS (PDMTS). The rectangular patch-based PDMTS is analyzed using characteristic mode analysis to find two orthogonal degenerate modes, which produces CP waves. Linearly polarized slot antenna is used to excite the PDMTS. The performance of PDMTS loaded slot antenna is analyzed numerically using full-wave analysis method. The PDMTS CP antenna is fabricated and its performance is tested experimentally. The proposed antenna has a compact structure and it has an overall size of $0.52{\lambda _0}\times 0.52{\lambda _0} \times 0.078{\lambda _0}$ (where ${\lambda _0}$ is the free space wavelength). The measured results show that the PDMTS antenna achieves $-10\,{\rm dB}$ impedance bandwidth of 29.41$\%$, 3-dB axial ratio bandwidth of 9.05$\%$, broadside gain of 6.34 dB, and monostatic RCS reduction of $-30.2\,{\rm dBsm}$ at the resonant frequency of 5.86 GHz. The simulated results are in well agreement with the measured results and it is well suited for C-band Radar and Satellite communication.

Keywords

Metasurfaceslot antennacharacteristic modecircular polarizationaxial ratio
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 2 , March 2020 , pp. 131 - 137
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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