Sleeve monopole antenna with integrated filter for base station applications

The sleeve monopole antenna with an integrated broadband filter is presented for base station applications. The antenna is designed to radiate from 698-960 MHz (low band) and provide band rejection from 1695-2690 MHz (high band). The antenna exhibits return loss better than -15 dB in the low band. The filter exhibits excellent rejection where the worst-case return loss is approximately -0.3 dB in the high band. The filter also reduces peak gain by as much as 50 dBi in the high band.