Asymmetric-Circular Shaped Slotted Microstrip Antennas for Circular Polarization and RFID Applications
Asymmetric-Circular Shaped Slotted Microstrip Antennas for Circular Polarization and RFID Applications
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DOI：
10.1109/tap.2010.2078476
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发表时间：
2010-09
影响因子：
5.7
通讯作者：
Nasimuddin;Zhi Ning Chen;X. Qing
中科院分区：
文献类型：
--
作者：
Nasimuddin;Zhi Ning Chen;X. Qing
新型带狭缝的不对称圆形开槽微带贴片天线被提议用于圆极化（CP）辐射和射频识别（RFID）读取器应用。采用基于单馈电配置的非对称圆形开槽方形微带贴片来实现紧凑的圆极化微带天线。沿对角线方向的不对称圆形槽对称地嵌入到方形微带贴片上，以实现 CP 辐射和小天线尺寸。 CP辐射可以通过缝隙区域沿着对角线方向的稍微不对称（不平衡）贴片来实现。四个对称狭缝还沿着非对称圆形开槽贴片的正交方向对称嵌入，以进一步减小天线尺寸。天线的工作频率可以通过改变狭缝长度来调节，同时保持CP辐射不变。 RO4003C 基板上的天线测得的 3dB 轴比 (AR) 带宽约为 6.0 MHz，阻抗带宽为 17.0 MHz。 900 MHz 时，天线整体尺寸为 0.27λo × 0.27λo × 0.0137λo。
Novel asymmetric-circular shaped slotted microstrip patch antennas with slits are proposed for circularly polarized (CP) radiation and radio frequency identification (RFID) reader applications. A single-feed configuration based asymmetric-circular shaped slotted square microstrip patches are adopted to realize the compact circularly polarized microstrip antennas. The asymmetric-circular shaped slot(s) along the diagonal directions are embedded symmetrically onto a square microstrip patch for CP radiation and small antenna size. The CP radiation can be achieved by slightly asymmetric (unbalanced) patch along the diagonal directions by slot areas. Four symmetric-slits are also embedded symmetrically along the orthogonal directions of the asymmetric-circular shaped slotted patch to further reduce antenna size. The operating frequency of the antenna can be tuned by varying the slit length while keeping the CP radiation unchanged. The measured 3-dB axial-ratio (AR) bandwidth of around 6.0 MHz with 17.0 MHz impedance bandwidth is achieved for the antenna on a RO4003C substrate. The overall antenna size is 0.27λo × 0.27λo × 0.0137λo at 900 MHz.