NDLI: RCS reduction of microstrip antenna using split square loop thin absorber

Content Provider	IET Digital Library
Author	Das, Priyanka Mandal, Kaushik
Abstract	This study proposes an electrically thin frequency-selective surface-based microwave absorber without using resistive surface and lumped resistors to make it simple and inexpensive. The ground plane of the microstrip antenna (MSA) serves as the metallic back of the absorber. The top two layers of the proposed absorber are printed on both sides of the top FR4 sheet in a square annular ring form to encircle the square patch. Both simulations and measurements are carried out to obtain the scattering parameters, which are used to retrieve the absorption coefficient, relative permittivity (ɛ r), and relative permeability (μ r). An equivalent circuit model for the proposed absorber is constructed and validated. The absorption performance is insensitive to the angle of incidence (θ) up to 50°. The absorption mechanisms are studied based on the surface current distribution, electric field distribution, and constitutive parameters. The absorber is then integrated with an MSA operating at 4.2 GHz, which gives a maximum monostatic radar cross-section (RCS) reduction of 15 dB. Numerical and experimental results of the radiation performance and the RCS of the absorber integrated antenna structure have been presented. A very good agreement between simulation and measurement results is observed.
Starting Page	1771
Ending Page	1778
Page Count	8
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 14, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2020.0347
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-08-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Absorber Integrated Antenna Structure Absorption Coefficient Antenna Radiation Pattern Electric Field Distribution Equivalent Circuit Frequency 4.2 GHz Frequency Selective Surface Frequency-selective Surface Metamaterial Antenna Microstrip Antenna Microwave Absorption Microwave MetaMaterial Monostatic Radar Cross-section Monostatic Radar Cross-section Reduction Radar Antenna Radar Cross Section Radar Equipment RCS Reduction Relative Permeability Relative Permittivity Scattering Parameter Single Antenna Split Square Loop Thin Absorber Square Annular Ring Form Square Patch Surface Current Distribution System And Application Top FR4 Sheet
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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