Broadband omnidirectional dual‐polarized antenna with high isolation

Abstract

ABSTRACTA broadband omnidirectional, dual‐polarized antenna suitable for 2G/3G/LTE applications is presented in this article. The dual‐polarized antenna has a vertically polarized element (VP element) and a horizontally polarized element (HP element). The VP element is a modified discone which can cover the frequency band of 800–2700 MHz (approximately 108%), including the GSM850/900 (824–849/890–960 MHz), DCS 1800 (1710–1880 MHz), PCS 1900 (1850–1990 MHz), UMTS (1920–2170 MHz), LTE 2300 (2305–2400 MHz), and LTE 2500 (2500–2690 MHz). The HP element is composed of a printed dipole array, feeding network, and four pairs of parasitical branches, achieving a wide bandwidth of 64% from 1530 to 2970 MHz (directly overlapping with the higher frequency band of VP element and having some surplus). High isolation larger than 36 dB is achieved in the common operating band because of the insertion of a large clearance. Smooth gain and low cross‐polarization levels are also obtained. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1848–1852, 2015