A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT module implements a relative phase shift...http://www.google.com.tw/patents/US20080218429?utm_source=gb-gplus-share專利 US20080218429 - Phased Array Antenna Applications on Universal Frequency Translation
