Abstract
In this paper, a wideband and high-gain antenna array with specific absorption rate suppression is presented. By adopting the wideband monopole antenna array and the uniplanar compact electromagnetic band gap (UC-EBG) structure, the proposed wearable antenna array can realize a high gain of 11.8–13.6 dBi within the operating band of 4.5–6.5 GHz. The sidelobe level of the proposed wearable antenna array is less than −12 dB, and the cross polarization in the main radiation direction is less than −35 dB. Benefiting from the UC-EBG design, the specific absorption rate is suppressed effectively, guaranteeing the safety of the proposed antenna array to the human body. The proposed antenna array is processed and tested, and the measurement results show good agreement with the simulation results.
Highlights
The communication system based on the human-body wireless area network [1] has gradually become a research hotspot due to the wide range of applications, such as human health monitoring [2], on-body wireless communication [3] and telemedicine [4]
Planar wearable antennas based on various flexible substrates have emerged, which can be roughly divided into the following types: monopole form [10–12], microstrip patch form [13,14], monopole combined with reflective structures such as artificial magnetic conductor (AMC) [15–18] or electromagnetic band gap (EBG) [19–23]
There are few works reported on the wearable antenna array, not to mention the realization of the wearable antenna array with high gain and wide operating band, which limits the application of wearable antennas
Summary
The communication system based on the human-body wireless area network [1] has gradually become a research hotspot due to the wide range of applications, such as human health monitoring [2], on-body wireless communication [3] and telemedicine [4]. The combination of the monopole and the reflective structure will enhance the forward radiation, achieving high isolation, thereby significantly reducing the SAR value and the radiation harm caused by the antenna. These works mentioned above [10–23] mainly focus on the single wearable antenna, while being committed to balancing the gain, bandwidth and SAR. The UC-EBG structure is designed, which is placed under the monopole antenna as a reflector It can increase the directivity and gain of the antenna, while suppressing the backward radiation, reducing the SAR value to meet international standards. The antenna array can achieve a realized gain of 11.8–13.6 dBi in the range of 4.5–6.5 GHz, the sidelobe level is less than −12 dB and the cross polarization is less than −35 dB for the main radiation direction, showing good potential in on-body communication
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