A method for tuning a resonant frequency of an antenna includes the steps of providing an antenna having a radiating element operating at a present resonant frequency, determining a target operating frequency of the antenna, mensurating the present resonant frequency of the antenna and calculating a...http://www.google.com.tw/patents/US7518560?utm_source=gb-gplus-share專利 US7518560 - Antenna and method for easily tuning the resonant frequency of the same
