A Low-Profile Dual-Layer Patch Antenna with a Circular Polarizer Consisting of Dual Semicircular Resonators.
A Low-Profile Dual-Layer Patch Antenna with a Circular Polarizer Consisting of Dual Semicircular Resonators.
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一种由双半圆谐振器组成的圆偏振器薄型双层贴片天线
DOI：
10.3390/s18061773
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发表时间：
2018-06-01
期刊：
影响因子：
--
通讯作者：
Li M
中科院分区：
文献类型：
--
作者：
Guo L;Tang MC;Li M
本文提出了一种由双半圆形开口环（DSSR）构成的圆偏振器。通过将其放置在辐射线性极化（LP）波的椭圆辐射器上方，根据DSSR的底部分裂的不同偏移方向，实现了能够辐射右旋（RH）或左旋（LH）圆极化（CP）波的双层贴片天线。由于与辐射器的电容耦合和受激DSSR中存在的简并模式，DSSR协同产生圆偏振辐射，成功地将入射LP波转换为CP波。仿真结果表明，两种CP天线的阻抗，轴比（AR）和增益频率响应是相同的，与模拟的3dB AR带宽为72 MHz，覆盖2.402-2.474 GHz和增益提高了3.9 dB。所提出的天线的制造和测量，揭示了65 MHz（2.345-2.41 GHz）的工作带宽和峰值增益高达9 dBi。此外，保持0.063λ0的低轮廓。所提出的CP天线具有相同的频率响应特性，可以作为无线目标检测应用的候选天线。
In this paper, a circular polarizer comprising dual semicircular split-rings (DSSRs) is presented. By placing it above an elliptical radiator that radiates linearly polarized (LP) waves, dual-layer patch antennas capable of radiating right-hand (RH) or left-hand (LH) circularly polarized (CP) waves are achieved in terms of the different offset direction of the bottom splits of the DSSRs. Because of both the capacitive coupling to the radiator and the degenerate modes existing in the excited DSSRs, the DSSRs collaboratively result in a circularly polarized radiation, successfully converting incident LP waves into CP ones. Simulated results show that the impedance, axial ratio (AR), and gain frequency response of both proposed CP antennas are identical, with a simulated 3-dB AR bandwidth of 72 MHz covering 2.402–2.474 GHz and a gain enhanced by 3.9 dB. The proposed antennas were fabricated and measured, revealing an operational bandwidth of 65 MHz (2.345–2.41 GHz) and a peak gain up to 9 dBi. Moreover, a low profile of 0.063λ0 is maintained. The proposed CP antennas could be as a candidate for wireless target detection applications in terms of their identical frequency response property.
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