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设计了一种可齐平安装的宽带超高频(UHF)天线。该天线由含有背腔结构的盘锥天线、盘锥顶盘与地板之间的短路结构、以及多板天线3个部分复合而成。这3个部分分别在频率的中端、低端和高端产生3个邻近的独立谐振点,从而有效地展宽了天线的工作带宽。分析了天线各主要结构参数对谐振频点和阻抗带宽的影响,给出了这些参数的最优值,并据此制作了天线样机。测试结果表明,设计的天线在430～845MHz的频带内,驻波比小于2.5,相对带宽为65%,辐射方向图水平全向。同时,该天线具有低剖面结构,整体高度小于最大工作波长的十分之一,在要求齐平安装的飞机和舰船等平台上具有广泛的应用前景。
Designed a flush mounted broadband UHF antenna. The antenna consists of a disc cone antenna with back cavity structure, a short circuit structure between the disc cone top plate and the floor, and a composite of three parts of the multi-plate antenna. These three parts respectively generate three adjacent independent resonance points at the mid-range, low-end and high-end of the frequency, effectively broadening the working bandwidth of the antenna. The influence of the main structural parameters of the antenna on the resonance frequency and the impedance bandwidth is analyzed. The optimal values of these parameters are given and the antenna prototype is fabricated accordingly. The test results show that the design of the antenna in the 430 ~ 845MHz frequency band, the VSWR less than 2.5, the relative bandwidth of 65%, the radiation pattern horizontal omnidirectional. At the same time, the antenna has a low profile structure, the overall height is less than one tenth of the maximum operating wavelength, and has broad application prospects on platforms such as aircraft and ships that require flush installation.