基于双层介质的宽轴比波束微带天线

为了展宽微带天线的3 dB轴比波束宽度(ARBW)，提出采用双层介质基板结构与单点同轴线馈电、引入切角微扰和半圆槽的方式，设计出一款小型化宽ARBW的圆极化微带天线。该天线的尺寸可用中心波长(0)表示为0.40800.40800.0360，工作频率可覆盖IEEE 802.16e(3.5 GHz)频段。利用基于有限元法的仿真软件(Ansoft HFSS15.0)对天线进行优化设计，获得天线3 dB ARBW为230~255，电压驻波比(VSWR)小于2的带宽为290 MHz，峰值增益在3.5 GHz为4.11 dB。测试结果与仿真结果基本一致，表明采用该结构和设计方式可以展宽天线的ARBW。

Wide axial ratio beamwidth microstrip antenna based on bilayer substrates

In order to improve 3 dB axial ratio beamwidth (ARBW) of the microstrip antenna, a miniaturized wide 3 dB ARBW circularly polarized microstrip antenna is proposed, and it is designed by using the structure of bilayer dielectric substrates and the methods of grooving on radiation patches, feeding by single point coaxial probe and perturbing by truncated corners. The size of the antenna is 0.40800.40800.0360 at central wavelength (0), and the operating frequency covers IEEE 802.16e (3.5 GHz) frequency band. Using the simulation software (Ansoft HFSS15.0) based on finite element method to optimize and simulate the antenna, the design results show that 3 dB ARBW is 230~255, the band of voltage standing-wave ratio (VSWR) less than 2 is 290 MHz, the peak gain is 4.11 dB at 3.5 GHz. Also, the test results are in good agreement with the simulation results. So ARBW of antenna can be broadened by the proposed structure and method effectively.