基于非对称结构的阅读器小型天线

The Reader Antenna Based on Asymmetric Structure

本文提出一种新型小型化RFID阅读器天线。该天线利用单点馈电,通过调节贴片上非对称八边形孔隙的半径实现圆极化,通过调节缝隙的长度,调节天线的谐振频率点。该种新型RFID手持阅读器微带天线的中心频率为915MHz,增益达到3.8dB。这种新天线具有紧凑的特点,该天线的尺寸为0.2714λ×0.2714λ×0.00136λ。

A compact circular antenna is presented for handheld reader applications in radio frequency identification（RFID） system. A square patch with four various octagon slots is designed to realize circular polarization and compact size. The proposed antenna designed and optimized at 915MHz can utilize the handheld reader space with greatly compact size. The overall antenna size is 0.2714λ× 0.2714λ× 0.00136λ. The measured 3-dB axial-raitio （ AR ） bandwidth is around 10MHz, and around 20MHz impedance bandwidth is achieved.