宽带圆极化微带缝隙天线的设计

Design of Wideband Circularly Polarized Microstrip Slot Antenna

本文提出了一种弯曲型馈电的新型紧凑宽带圆极化缝隙微带天线的设计。该天线由一切角的方形环辐射贴片和新型带线构成。使用弯曲微带线激励形成圆极化辐射模式。通过在环形缝隙对角方向引入一对金属加载,可以有效地提高轴比带宽。测量结果表明,该天线具有90.59%(3.2～8.5 GHz)的阻抗宽带和84.2%(3.3～8.1 GHz)的3dB以下的轴比带宽。

This communication presents a novel compact and wideband circularly polarized(CP) slot antenna fed by microstrip feedline. The proposed antenna consists of a corner-truncated square-ring slot patch and a novel bent strip. The CP radiation is formed by using the bent strip to excite CP resonance modes. By intruding several open stubs to the corners of the square-ring slot patch, the impedance matching and the axial ratio(AR) bandwidth are improved. The measured results show that the proposed antenna has the advantage of wideband characteristics in terms of an impedance bandwidth of 90.59%(3.2-8.5 GHz) and 3-dB axial ratio bandwidth of 84.2%(3.3-8.1 GHz). The principle as well as simulated and measured results of the proposed antenna was revealed.