一、引言短波天线小型化的研究,在国内外都是引人注意的尚未完全解决的问题;主要原因是天线变小后会带来频带变窄,效率低,难以匹配等一系列问题,而使用单位又要求电波覆盖区有远、中、近;从理论观点看,要达到这些要求是不可能的;但可以根据实际要求出发,制 I. INTRODUCTION The research on the miniaturization of shortwave antennas is an outstanding problem that has not yet been fully solved in China and abroad. The main reason is that the narrowing of the antenna leads to a series of problems such as narrowing of the frequency band, low efficiency and difficulty in matching. The use of units requires that the radio coverage area be far, middle and near; from a theoretical point of view, it is impossible to meet these requirements; however, it can be set out on the basis of practical requirements