介质谐振天线枝节驱动型频率重构特性分析

为了满足认知无线电系统对于天线的动态需求,提出了一种介质谐振天线(dielectric resonator antenna, DRA)-10 dB阻抗带宽重构方法。采用的天线由阶梯阻抗微带线激励,并与截断的地板相结合,以使矩形DRA具有带宽为7.85 GHz的宽带状态用于频谱感知。在馈线高阻抗和低阻抗区域分别引入开路枝节和T形枝节,并通过p-i-n二极管开关控制,以获得相应频段的窄带特性用于通信。连接在地板上的枝节可使天线工作在陷波状态,用于滤除干扰。天线尺寸为25 mm×25 mm×5.637 mm。为了验证设计的有效性,加工测试了一个可重构DRA原型,仿真和测试结果具有良好的一致性。

Stub-driving frequency reconfigurable characteristic analysis for dielectric resonator antenna

A rectangular dielectric resonator antenna (DRA) with a reconfigurable impedance bandwidth of -10 dB is presented for cognitive radios. The antenna is fed by a stepped impedance transform offset microstrip line with truncated ground, which makes it operated at a wideband state with a bandwidth of 7.85 GHz for sensing the spectrum. Open-circuited stub and T-shaped stub are introduced for generating narrow band state controlled by p-i-n diodes respectively for communications. The stub connected with the ground plane makes the antenna operated at the band-notched state for filtering out interference. It has a compact dimension of 25 mm×25 mm×5.637 mm. In order to verify the design, a reconfigurable DRA prototype is fabricated and measured. Simulation and experimental results show a good uniformity.