一种双频微带天线方案的分析与设计

运用以矩量法为原理的软件(Ensemble和Hfss)，分析了加载缝隙在双频微带贴片天线中的作用机理，给出了缝隙尺寸、位置变化时天线特性的变化规律。使用该技术可以在1～2．06之间方便地调整微带天线两个谐振频率的比例关系。利用此技术分别设计了工作频率为2GHz和2．55GHz的矩形天线以及工作频率为1．8GHz和1．9GHz的三角形天线，其回波损耗可优于20dB。加工并测量了一双频三角形天线产品，测量结果证明了该方案的有效性和可行性。

Analysis and design of a new dual-frequency microstrip-antenna

An approach to design dual frequency patch antennas is presented, in which slots are applied to adjust the resonant frequencies of microstrip antennas. The method of moment is involved to analyze the effect of slots on the antenna characteristics, including bandwidth, antenna pattern, S parameters, input impedance, equivalent surface current distribution, and gain. Changing the length and location of the slots, tendencies of the antennas' S parameters are obtained. By inserting a pair of oblique slots and adjusting their parameters properly, frequency ratio from 1~1 16 and 1 77~2 06 are obtained, and combining the technique with other methods, a wider frequency ratio from 1 to 2 06 is acquired. Two antennas, working at 2 GHz & 2 5 GHz and 1 8 GHz & 1 9 GHz respectively, are designed by the approach shown in this paper, and the return loss is better than 20 dB. The validity and feasibility are proved by the measuring result of the real antenna. And a dual frequency patch antenna was machined and analyzed