Table of Contents Author Guidelines Submit a Manuscript
International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 383716, 9 pages
Research Article

Reduction of the In-Band RCS of Microstrip Patch Antenna by Using Offset Feeding Technique

1Key Laboratory of All Optical Network & Advanced Telecommunication Network of MOE, Beijing Jiaotong University, Beijing 100044, China
2Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China

Received 7 July 2014; Revised 6 September 2014; Accepted 22 September 2014; Published 29 October 2014

Academic Editor: Vincenzo Galdi

Copyright © 2014 Weiwei Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a method for implementing a low in-band scattering design for microstrip patch antennas based on the analysis of structural mode scattering and radiation characteristics. The antenna structure is first designed to have the lowest structural mode scattering in a desired frequency band. The operating frequency band of the antenna is then changed to coincide with that of the lowest structural mode scattering by adjusting the feed position on the antenna (offset feeding) to achieve an antenna with low in-band radar cross section (RCS). In order to reduce the level of cross polarization of the antenna caused by offset feeding, symmetry feeding structures for both single patch antennas and two-patch arrays are proposed. Examples that show the efficiency of the method are given, and the results illustrate that the in-band RCS of the proposed antennas can be reduced by as much as 17 dBsm for plane waves impinging from the normal direction compared to patch antennas fed by conventional methods.