基于法布里-珀罗腔的圆极化太赫兹天线设计

Design of Circularly Polarized Terahertz Antenna Based on Fabry-Perot Cavity

为满足未来无线通信的高带宽与圆极化通信的需要,提出了一种基于法布里-珀罗腔的圆极化太赫兹天线。该天线采用准光学的波导馈电模式,对圆波导45°切槽实现天线的线-圆极化转换,采用电介质材料的部分反射面来提高天线的增益。仿真分析表明,该天线在228 GHz处获得最大增益为14.4 dBic,阻抗带宽(S_(11)<-10 dB)为40 GHz, 3 dB增益带宽和轴比带宽分别为18与27 GHz,三者重叠带宽为18 GHz。该天线具有良好的方向性、高带宽以及在整个工作频带实现圆极化等优点,在太赫兹/毫米波无线通信中有一定的参考性与实用性。

In order to meet the needs of high bandwidth and circularly polarized communication in future wireless communication, a circularly polarized terahertz antenna based on a Fabry-Perot cavity is proposed. The antenna adopted a quasi-optical waveguide feeding mode, the circular waveguide was cut at 45° to realize the linear-circular polarization conversion of the antenna, and the partial reflecting surface of the dielectric material was used to improve the gain of the antenna. The simulation analysis shows that the maximum gain of the antenna is 14.4 dBic at 228 GHz, the impedance bandwidth(S_(11)<-10 dB) is 40 GHz, the 3 dB gain bandwidth and the axial ratio bandwidth are 18 and 27 GHz respectively, and the overlapping bandwidth of the three is 18 GHz. The antenna has the advantages of good directivity, high bandwidth and circular polarization in the entire working frequency band, and has high reference and practicability in terahertz/millimeter wave wireless communication.