10kHz交流等离子体天线辐射特性和电磁兼容性分析

Analysis on Radiation Characteristics and Electromagnetic Compatibility of 10 kHz AC Plasma Antenna

表面波等离子体天线因存在很强的电磁干扰而导致电磁兼容性较差,必须采用相应的技术手段或利用新型电源作为天线激励源以满足天线的电磁兼容性要求。为此,采用5～20kHz高压交流电源作为激励源构建了10kHz交流等离子体天线,并分析了其辐射特性和电磁兼容性。研究结果表明,在较宽的频带范围内,该10kHz交流等离子体天线的电压驻波比(VSWR)<2;同50Hz交流等离子体天线相比,该天线的噪声明显减小,且天线的增益在150～350MHz频带范围内有所提高;使用该天线接收无线广播时收音机可以接收到广播电台信号,而表面波等离子体天线则会因过强的干扰而导致收音机不能正常工作。该10kHz交流等离子体天线不仅在带宽特性上有所改观,而且同表面波等离子体天线相比具有较低的电磁干扰。

The strong electromagnetic interference in surface wave plasma antenna leads to its poor electromagnetic compatibility. In order to find appropriate means or new power supply to solve the problem, a 10 kHz AC plasma antenna prototype was established using a 5- 20 kHz high voltage AC power supply. The prototype＇ s radiation characteristics and electromagnetic compatibility were measured and analyzed. The results show that voltage standing--wave ratio （VSWR} is less than 2 in broad frequency range. Compared with 50 Hz AC plasma antennas, the noise reduces, and the gain increases from 150 MHz to 350 MHz. When connecting the plasma antenna to a radio, the radio can receive radio broadcasting normally. For the 10 kHz AC plasma antenna, there is improvement not only in its bandwidth, but also in its electromagnetic compatibility.