High isolation dual-polarized broadband antenna for base stations

Abstract

A broadband (1.71–2.17 GHz), high isolation, and dual-polarized suspended plate antenna (SPA) is presented. Modified L-probe feed is used for broadband matching and capacitive coupling. Port isolation between two orthogonally polarized channels is improved by making extensions on suspended plates (SPs) and inserting a vertical ungrounded square tube under the first SP (SP1). The prototyped SPA resulted in 8 ± 0.5 dBi gain and 67° ± 6° symmetric E-plane and H-plane radiation patterns with low cross-polarization levels. Return losses ≤−15 dB and port isolation ≤−30 dB are achieved in the entire band. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:603–607, 2015