Isolation improvement of a TRx stacked microstrip patch antenna using double spur‐line band rejection filters

Abstract

In this article, we present a TRx stacked microstrip patch antenna with improved isolation using double spur‐line band rejection filters (DSL‐BRFs).The typical TRx stacked microstrip patch antenna designed to operate at Ku‐band with downlink frequency band of 12.25–12.75 GHz and uplink frequency band of 14.0–14.5 GHz had inherent isolation of 16 dB within TRx‐band. The isolation performance of the antenna was improved by at least 23.45 dB in Rx‐band and 17.82 dB in Tx‐band after introducing the DSL‐BRFs into Tx‐ and Rx‐feed networks, respectively. Because the DSL‐BRFs are compatible to be embedded in 50‐Ω transmission lines, the TRx antenna with the filters are remained in as same size as the antenna without filters. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1444–1448, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27632