文章介绍了一款工作在VHF波段的同轴型缝隙天线。针对一段两端封闭的同轴结构,通过理论分析得出其内部可能存在类似于矩形波导模式的电磁波模式。在此基础上,设计了适当的开缝和探针馈电结构,使其具有水平极化波辐射能力。天线相比目前的同轴缝隙天线拥有更小的电尺寸,达到了小型化的效果。仿真结果表明,天线谐振点位于118.5MHz,-10d B阻抗带宽为3.7%,且增益可以达到4.17d B。鉴于原型天线尺寸过大,特制作了10:1的天线缩比模型进行测试,测试结果与期望值吻合良好。 This article describes a coaxial slot antenna operating in the VHF band. For a section of coaxial structure closed at both ends, theoretical analysis shows that there may be similar to the rectangular waveguide mode electromagnetic wave mode. On this basis, the design of the appropriate slot and probe feed structure, it has a horizontal polarization of radiation. Compared to the current coaxial antenna slot antenna has a smaller size, to achieve the effect of miniaturization. The simulation results show that the antenna resonance point is located at 118.5MHz, the bandwidth of -10d B impedance is 3.7%, and the gain can reach 4.17d B. In view of the prototype antenna size is too large, specially made a 10: 1 antenna ratio model for testing, the test results and expectations in good agreement.