Circularly Polarized Stacked Annular-Ring Microstrip Antenna With Integrated Feeding Network for UHF RFID Readers
Circularly Polarized Stacked Annular-Ring Microstrip Antenna With Integrated Feeding Network for UHF RFID Readers
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DOI：
10.1109/lawp.2010.2051791
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发表时间：
2010-06
影响因子：
4.2
通讯作者：
X. Chen;G. Fu;S. Gong;Ya-li Yan;Wei Zhao
中科院分区：
文献类型：
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作者：
X. Chen;G. Fu;S. Gong;Ya-li Yan;Wei Zhao
提出了一种用于美国超高频射频识别(RFID)阅读器的新型圆极化环形微带天线(ARMSA)。环形环由90°相位差等分功率分配器馈电。为了整个天线的紧凑性，在环形环的内侧设计了阿基米德渐变线形状的分路器。在环上方悬挂一个圆形寄生贴片，以改善阻抗匹配和带宽。它还提高了轴比的性能。S11<；-10分贝和3-分贝AR带宽的阻抗带宽分别为870-967 MHz(915 MHz时为10.6%)和893-948 MHz(6%)。在915 MHz下，CP增益为8.9 dBI，前后比(F/B)为16.5 dB.该天线的总高度为0.043λ0(λ0为自由空间波长)，因此是低调的。
A novel circularly polarized (CP) annular-ring microstrip antenna (ARMSA) is proposed for American ultrahigh frequency (UHF) radio frequency identification (RFID) readers. The annular ring is fed by an equal-split power divider with 90° phase difference. For the compactness of the entire antenna, the divider with the shape of Archimedes gradual-change lines is designed at the inside of the annular ring. A circular parasitic patch is suspended above the ring to improve the impedance matching and bandwidth. It also enhances the performances of axial ratio (AR). The impedance bandwidth for S11 <; -10 dB and 3-dB AR bandwidth are 870-967 MHz (10.6% at 915 MHz) and 893-948 MHz (6%), respectively. The CP gain is 8.9 dBi at 915 MHz with the front-to-back ratio (F/B) of 16.5 dB. The proposed antenna is low profile as the total height is 0.043 λ0 (λ0 is the free-space wavelength).