加载小型天线的谐振腔特性分析及应用研究

Property analysis of cavity loaded with small antenna and application research

提出了一种测量小型天线的方法,以适应对数量极为庞大的终端天线产品特性的逐一检测。理论分析和实验验证均表明:谐振腔内放入双频天线时,会出现三个谐振频率,其一为加载天线后的腔体的谐振频率,另外两个是受外加激励由天线产生的辐射场。前者携带有天线几何结构及其构成材料的信息,后者含有天线辐射特性方面的信息。据此,建立了一套可对批量天线产品性能进行检测的谐振腔系统,该系统还可对其它小体积样品的物理特性进行测量,同时使谐振腔的应用由对一般材料特性的测量扩展到了对有辐射特性器件的测试。

A new method of measuring small antenna is presented, which can measure a mass of terminal antennas every last. The character of cavity loaded with small antenna is analyzed and verified in this paper. When a dual band antenna is placed in a cavity, there are two weak resonance frequencies beside the resonance frequency of the cavity which deviated from frequency of empty cavity. The weak resonance frequencies are the small antenna radiation which is excited by the field in the cavity. The stronger resonance frequency contains the information of the antenna structure and materials, and the two weaker frequencies contain the information of radiation. Based on such theory and experiment results, a measurement system was designed,which can be used to test volume-produced antenna. This system can be extended to other small components survey such as dielectric resonator. In conclusion, the application of resonance cavity is extended from the dielectric constant to radiation component.