一种空气耦合馈电的宽带小型化定向天线的设计  

Design of a Broadband Miniaturized Directional Antenna with Air Coupled Feed

作　　者：冯洋 张峻文 田时雨 张志亚[1] Feng Yang;Zhang Junwen;Tian Shiyu;Zhang Zhiya(National Laboratory of Science and Technology on Antenna and Microwaves,Xidain university,Xi’an 710071)

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,西安710071

出　　处：《测控与通信》2021年第3期9-12,共4页

摘　　要：本文提出了1种空气耦合馈电的宽带小型化定向天线。通过在振子末端引入渐变宽度的半弧形弯折臂,天线输入阻抗变得更加平缓且靠近匹配点,并且可有效减小天线的横向尺寸。该天线振子通过电磁耦合馈电巴伦进行馈电,进一步调谐了天线的阻抗匹配特性且能够获得1个良好的辐射特性。天线的实际物理尺寸仅为0.35λ_(0)×0.22λ_(0)×0.006λ_(0)(λλ为中心频率处自由空间的波长)。仿真结果表明,所提出的新型折合天线电压驻波比VSWR<2.0相对带宽达到32.1%(136~188 MHz)。同时,在工作频带范围内天线的交叉极化隔离度均大于28dB,天线增益大于7.0 dBi。A boadband miniaturized directional antenna with air coupled feed is proposed in this paper.By introducing semi-arc bend arms with gradual width at the end of the folded dipole,the input impedance of the antenna becomes flat and close to the matching point.The folded dipole is fed by an electromagnetically coupled feed balun,further tuning the impedance match ing characteristics of the antenna and obtaining a good radiation pattern.Paticularly,the size of the antenna is only 0.35λ_(0)×0.22λ_(0)×0.006λ_(0)(λ_(0)is the free-space wavelength at the center frequency).The simulated results show that the presented antenna has a impedance bandwidth of 32.1%(136~188MHz)for VSWR<2.Meanwhile,the cross-polarization isolation is more than 28 dB and the gain is greater than 7.0 dBi.

关 键 词：小型化 定向天线 宽带 折合振子 

分 类 号：TN8[电子电信—信息与通信工程]