Shortwave Broadband Miniaturized Monopole Antenna Research

In the modern military affairs communication, the multi-band, multifunctional station was widely used in order to achieve secret communication. The naval ship or tank has many antennas, take it discommodiously, it requires the broadcasting station can work with one antenna, so it need the antenna has a broad band. The HF monopole usually has a big size, above 10 meters, installing or taking is discommodiously. The technology of antenna miniaturization in the condition of keeping the performance is an interesting research.This dissertation mainly searches the design and realization of HF monopole. Many technologies of electrically small antennas and wide band antennas are discussed in theory, simulation and experiment. And two novelty antennas are proposed. The author's major contributions are as follows:1. Based on the conventional wideband antenna structure and the technology of antenna miniaturization, by the way of analysis and simulation, proposed two HF wideband smart antennas.2. Discussing the affect of the parameters of lumped loaded and location, and based on the research, realize the optimizing design of loading.3. The loading technology and broadband matching network are used to design the antenna which dimension is confined. It is not enough to design antenna using loading technology, but the loading circuit parameters, locations of the loads along the antenna, and matching network's circuit parameters are optimized simultaneously.To make use of above these ways a broadband HF monopole are designed successfully, and they can realize the VSWR<3.5, Gain>-10dB and the height <4m over 2~30MHz.