摘要：作为一个在FOB短路或开环小孔径超高频天线用于远程无钥门禁（ RKE ）应用，可以终止。取决于如何终止循环，其远场模式和天线的特性阻抗会受到影响。Maxim > App Notes > Automotive Keywords: UHF antenna, RKE, remote keyless entry Mar 26, 2006 APPLICATION NOTE 3621 Small Loop Antennas: Part 1―Simulations and Applied Theory Abstract: Small-aperture UHF antennas for remote-keyless-entry (RKE) applications can be terminated either as a shorted or open loop within a fob. Depending on how the loop is terminated, its far-field pattern and the antenna's characteristic impedance will be influenced. In this application note we will explore antenna theory and design using EZNEC, an easy-to-use antenna simulator. We will measure the antenna's characteristic impedance through our application board. The results will show the tradeoffs between open and shorted loops, the effects of the ground……