The smart antenna module for RF repeater

The signals received at the receiving antenna are consist of signals from base station (or mobile terminal) and transmitted signals from the other side of antenna in a RF repeater. And the amplification rate of the RF repeater is limited by the feedbacked signals from the same repeater. Therefore, a receiving antenna has to be isolated from a transmitting antenna in order to reduce the effect of the feedbacked signal in the RF repeater. Or, recently, ICS (interference cancellation system) techniques have been studied to estimate and to remove the feedback signals. However, it requires lots of hardware complexity and computational delay. To solve these problems, we have studied the implementation and adaptation of smart antenna system for RF repeaters. We have designed a smart antenna module with switching beam structure in order to reduce the hardware and computational complexity. After analyzing the proposed smart antenna module, we found out that the proposed repeater increases the amplification rate 15dB compare to the conventional RF repeater.