A Broadband Dual-Polarized Antenna for TD-SCDMA System

摘要

A broadband dual-polarized antenna is proposed for TD-SCDMA system. The dual-polarized antenna is combined with two perpendicularly crossed dipoles. Crossed dipoles can reduce the same frequency interference and improve the signal reception effect. The isolation of this dual-polarized antenna is greater than 25 dB for co-polarization and 28 dB for cross-polarization. The measured results demonstrate that voltage standing wave ratio (VSWR) is no more than 1.3 at the operating frequency and the antenna has an average gain of 8.3 dBi for slant polarizations. That is, our proposed antenna meets the requirements for stringent design. We use array antenna technology based on the requirements of gain and beam tilt. A 5-element dual polarized antenna array is realized by 5-way unequal power divider at 1880 2635 MHz. The antenna gain of the array is about 12.5 dBi for different polarization. In numerical and measured results, the specific design methods and ideas of antenna and power divider are presented. As we can see from the test results, the antenna presented in this paper is far better than the industry standard.