ANTENNA HAVING ACTIVE AND PASSIVE FEED NETWORKS

摘要

An antenna having a passive feed network in one band, and an active radio network in an adjacent band, is provided herein. The antenna includes a plurality of radiating elements arranged in an array. The radiating elements are dimensioned to transmit and receive RF signals, for example, in a band of 790 MHz to 960 MHz. The antenna includes a plurality of diplexers having a first port, a second port and a third port. The first port of each diplexer coupled to at least one radiating element. The diplexer has a first filter coupling the first port to the second port and a second filter coupling the first port to the third port. In one example, involving the GSM900 band, the first filter is a band pass filter having a pass band of 790-862 MHz and the second filter is a band pass filter having a pass band of 880-960 MHz. A passive feed network includes a phase shifter, which is coupled to an input transmission line and a plurality of output transmission lines. Each of the output transmission lines may be coupled to one of the second ports of one of the diplexers. An active feed network comprising a plurality of active radios is also included. An active radio is coupled to each of the third ports of the plurality of diplexers.