基于E型贴片微带结构的无线电视发射天线

Wireless television transmitting antenna based on E-shaped patch microstrip structure

为减小传统电视发射天线的体积,提出将微带结构天线应用于电视发射系统的方法,设计一种基于E型贴片叠层的微带天线.通过采用叠层结构、E型贴片、馈电探针加装金属垫圈、空气填充和7/16射频同轴连接器,实现了微带结构的电视发射天线.为验证方法的有效性,加工了一款微带结构的UHF频段电视发射天线.测试结果表明:天线驻波比小于1.15(|S11|≤-23 d B)的相对阻抗带宽达到18.2%(频率范围544 MHz^653 MHz);中心频率处天线增益为9.23 d Bi;在1000W发射功率下,天线能够可靠工作.设计的微带结构电视发射天线尺寸显著减小,简化了天线结构和调试过程,从而节约了天线的制作成本.

To reduce the volume of the traditional TV transmitting antenna,the method was proposed by using microstrip antenna in TV transmission system,and an E-shaped patch antenna based on stacked structure was designed. By using the stacked structure,the E-shaped patch,the washer on the probe of the feed,the air substrate and the 7 /16 type RF coaxial connector,the television transmitting antenna for microstrip structure was realized. To verify the effectiveness of the proposed method,a microstrip structure of UHF band TV transmitting antenna was processed. Test results show that the impedance bandwidth of the proposed antenna for ｜ S11｜ ≤- 23 d B is extended to 18. 2 %（ frequency range from 544 MHz to 653 MHz）. The antenna gain is 9. 23 d Bi at the center frequency and can normally work under 1000 W input power.The microstrip patch antenna for the TV transmitting system greatly reduces the size and simplifies the structure of the TV transmitting antenna,as a result,the cost of the antenna can be largely saved.