A circular slotted reconfigurable antenna for WIMAX and X-band wireless communication applications is presented. The aim of this article is to design an antenna, which can operate at dual band with high gain. The designed antenna is compact in size with dimensions 32–24 mm.CPWfeeding is used in the design of frequency reconfigurable antenna, and BAR-64-20V PIN diodes are installed for frequency tuning operation. By employing a T-shaped resonator inside the circular slot and a parallel resonator in transmission line, the dual band operation is realized. The antenna covers WiMAX (3.1–4.5 GHz) and X-band (10.3–11.7 GHz) for such applications as space research and mobile radio astronomy. Frequency switching is attained by the proper positioning of PIN diodes at the circular slot. The proposed compact antenna shows good radiation characteristics and good impedance bandwidth.

中文翻译：

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用于 WiMAX 和 X 频段应用的双频段可重构紧凑圆形缝隙天线

介绍了一种用于 WIMAX 和 X 波段无线通信应用的圆形开槽可重构天线。本文的目的是设计一种天线，它可以在高增益的双频段下工作。设计的天线尺寸紧凑，尺寸为32-24 mm。频率可重构天线设计采用CPWfeeding，安装BAR-64-20V PIN二极管进行频率调谐操作。通过在圆形槽内采用T形谐振器并在传输线中采用并联谐振器，实现了双频带操作。天线覆盖 WiMAX (3.1–4.5 GHz) 和 X 波段 (10.3–11.7 GHz)，适用于空间研究和移动射电天文学等应用。频率切换是通过将 PIN 二极管正确定位在圆形槽中来实现的。