Dual-Polarized Filtering Dipole for Base Station Application

In this paper, a compact dual-polarized filtering dipole is proposed for base station application with a size of ${31} {\times 31\times 25}\ \ \text{mm} {(0.60\lambda_{0}\times 0.26\lambda_{0}\times 0.21\lambda_{0})}$. The antenna consists four parts: main radiator, feeding baluns, reflector and two parasitic loops. Filtering response is obtained by adding a parasitic square loop and a cross loop in close proximity to radiator, which are corresponding to the lower and upper stopband radiation nulls, respectively. The operating bandwidth of the proposed antenna is LTE band from 2.3-2.7 GHz. The out-of-band suppression level is about 15 dB within 1.71-2 GHz and 3.3-3.6 GHz. The simulated port isolation is more than 34 dB. The proposed antenna element is suitable for potential base station applications.