A Compact, Wideband Circularly Polarized Co-designed Filtering Antenna and Its Application for Wearable Devices With Low SAR
A Compact, Wideband Circularly Polarized Co-designed Filtering Antenna and Its Application for Wearable Devices With Low SAR
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DOI：
10.1109/tap.2015.2452942
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发表时间：
2015-09-01
影响因子：
5.7
通讯作者：
Werner, Douglas H.
中科院分区：
文献类型：
--
作者：
Jiang, Zhi Hao;Werner, Douglas H.
报道了一种小型圆极化滤波天线。该装置是基于一个贴片辐射器无缝集成的带通滤波器组成的耦合带状线开环谐振器，这是设计在一起作为一个系统。在所提出的设计中，贴片同时用作辐射器和滤波器的最后一级谐振器，从而产生具有0.53 lambda（0）x 0.53 lambda（0）x 0.07 lambda（0）的小的整体形状因子的低轮廓集成辐射和滤波模块。结果表明，滤波电路不仅确保频率选择性，但也提供阻抗匹配功能，这有助于拓宽阻抗和轴比带宽。设计的滤波天线经过加工和测试，在3.77 ~ 4.26GHz的带宽范围内，S-11 <-13.5dB，轴比小于3dB，增益大于5.2dBi，约12.2%，这使其成为集成到各种无线系统中的优秀候选者。还演示了集成滤波天线的线极化版本。此外，进一步的全波仿真和实验进行了验证，所设计的CP滤波天线保持其性能，即使安装在不同位置的人体与各种身体姿态。稳定的阻抗和辐射特性也使其成为离体无线通信的可穿戴天线的合适候选者。
A compact circularly polarized (CP) co-designed filtering antenna is reported. The device is based on a patch radiator seamlessly integrated with a bandpass filter composed of coupled stripline open-loop resonators, which are designed together as a system. In the proposed design, the patch functions simultaneously as the radiator and the last stage resonator of the filter, resulting in a low-profile integrated radiating and filtering module with a small overall form factor of 0.53 lambda(0) x 0.53 lambda(0) x 0.07 lambda(0). It is shown that the filtering circuit not only ensures frequency selectivity but also provides impedance matching functionality, which serves to broaden both the impedance and axial ratio bandwidths. The designed filtering antenna was fabricated and measured, experimentally achieving an S-11 < -13.5 dB, an axial ratio of less than 3 dB and a gain higher than 5.2 dBi over a bandwidth from 3.77 to 4.26 GHz, i.e., around 12.2%, which makes it an excellent candidate for integration into a variety of wireless systems. A linearly polarized version of the integrated filtering antenna was also demonstrated. In addition, further full-wave simulations and experiments were carried out to verify that the designed CP filtering antenna maintains its properties even when mounted on different positions of the human body with various body gestures. The stable impedance and radiation properties also make it a suitable candidate as a wearable antenna for off-body wireless communications.