Physical and Quantitative Analysis of Compact Rectangular Microstrip Antenna with Shorted Non-Radiating Edges for Reduced Cross-Polarized Radiation Using Modified Cavity Model Dia Ghosh1, Sudip Kr Ghosh1, Sudipta Chattopadhyay1, Swarnali Nandr, Debolina Chakraboryt, Rishav Anand1, Rahul Rajt, and Abhiyoti Ghosh2 1Department of ECE, Siliguri Institute of Technology, PO-Sukna, Darjeeling, Siliguri,WB -734009, India E-mail: dia.slg42@gmail.com.ghsh_sdp@yahoo.com.sudipta_tutun@yahoo.co.in 2Department of ECE Mizoram University Aizawl, Mizoram - 796004, India E-mail: abhijyoti_engineer@yahoo.co.in Abstract A straightforward and compact rectangular microstrip antenna with a shorted nonradiating edge was proposed and experimentally investigated for significant suppression of cross-polarized (XP) radiation compared to maximum co polarized gain, without afecting the co-polarized radiation pattern. The proposed antenna was thoroughly studied using simulation and experimental results. A modified cavity model (MCM) was also demonstrated to understand the behavior of the cross-polarized radiation and the complete resonance behavior for the new structure. The proposed theory helps to germinate a real and clear view of the observed phenomena. The proposed idea was experimentally confirmed with the present structure on three different substrate materials, with diferent dielectric constants. The new approach presented here provides an insightful visualization-based understanding of cross-polarized suppression with the present structure. Keywords: Conventional patch antenna; cross polarized radiation; co-polarized gain; shorted non-radiating edge 1. Introduction I n the present era,most wireless-communication devices are trending towards small size and multi-fnctionality. There fore,designing small antennas with high radiation perforance is crucial to constructing an efcient wireless communication system. In this scenario, a microstrip antenna is a good candidate that can produce such typical qualities as small size, light weight, and compatibility with MMIC, along with moderate radiation perforance. In the fundamental mode (TM 10 ),these antennas radiate along the broadside of the element, and the IEEEAntennasandPrpagation Magazine, Vol.56, No.4,August2014 feld is primarily linearly polarized. However, some degree of orthogonally polarized radiation, called cross-polarized (XP) radiation, takes place. This was theoretically studied in [I, 2]. The cross-polarized radiation becomes signifcantly prominent for probe-fed designs,particularly when the thicknesses as well as the dielectric constant of the substrate increases [3, 4]. The cross-polarized radiation thus becomes an important issue for investigation for microstrip-antenna research. The cross-polarized radiation (XP) felds are more signif cant in the H plane than in the E plane,as obtained in the open ISSN1045-9243/2012/$262014 IEEE 61