一种小型化超宽带共面波导馈电蘑菇形单极子天线

Miniature ultra-wideband CPW-fed monopole antenna with mushroom-shaped structure

提出一种简单的尺寸为23 mm×25 mm×1 mm小型化超宽带共面波导馈电单极子天线,它由梯形槽口接地板、蘑菇形辐射贴片和RF4介质板构成。详细讨论了梯形槽口结构和矩形渐变结构对阻抗特性的影响,分析了天线的辐射特性和增益特性,获得该天线的回波损耗小于-10 dB的带宽为3-13 GHz,在3-11 GHz频段内具有全向性,增益变化范围是2.2-5 dB。

A simple and compact ultra-wideband monopole antenna fed by coplanar waveguide （CPW） is presented. The overall size of the antenna is 23 mm × 25 mm×1 mm, which consists of a ground plane with trapezium-shaped slot and a mush-room-shaped radiating patch printed on the same side of the substrate. By optimizing trapezoid slot and loading rectangular gradient structure, the impedance matching characteristics is analyzed and a wide impedance bandwidth from 3 GHz to more than 13 GHz with 10 dB return loss is obtained. Meanwhile, the radiation characteristics and gain characteristics of the antenna are discussed. The antenna exhibits good radiation behavior and its gain varies from 2.2 dB to 5 dB in 3-11 GHz bandwidth.