While mid-wave antenna is mostly iron tower antenna, we do not use directional antenna except that we need special service in special area.
中波天线大部分采用铁塔天线，非特殊地形或特别要求的服务区外，均采用不定向天线。
The characteristics of the omni-directional periodic circular dielectric rod leaky-wave antenna are analyzed by the improved perturbation method.
本文用改进的微扰法分析了一种新型圆柱介质栅毫米波全向漏波天线的辐射特性。
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