研究目的
To design a novel circularly polarized button antenna for U-NII 5.47-5.725GHz applications, featuring a compact size and broadside radiation pattern, suitable for on-torso off-body channel applications.
研究成果
A novel circularly polarized button antenna for U-NII 5.47-5.725GHz applications was successfully designed, simulated, prototyped, and measured. The antenna features a compact size and broadside radiation pattern, with good agreement between measured and simulated results. It is the first button structure achieving circular polarization in this band with a very compact size.
研究不足
The antenna's performance may be affected by human body movements, especially in on-torso and on-arm situations. The axial ratio bandwidth is narrower in on-torso measurements, possibly due to small movements of the human body during measurement.
1：Experimental Design and Method Selection:
The antenna was designed and simulated using CST Microwave Studio
2：The main radiator was constructed on a disc-shaped FR-4 substrate, with radiating elements on both sides. A flexible matching circuit was placed on the surface of a textile layer. Sample Selection and Data Sources:
20 A prototype was fabricated and measured. The measurements were performed using an Agilent Vector Network Analyzer and the anechoic chamber at KU Leuven.
3：List of Experimental Equipment and Materials:
The antenna was constructed on an FR-4 substrate (thickness of 1mm, permittivity of
4：3, loss tangent of 025), with a layer of normal textile (permittivity and loss tangent of 4 and 044) and a conductive textile (SHIELDIT? SUPER, conductivity of 18×105 S/m) forming the flexible ground. Experimental Procedures and Operational Workflow:
The antenna's performance was evaluated in free space, on-torso, and on-arm (bending) situations. The reflection coefficient, axial ratio, gain, and radiation patterns were measured and compared with simulated results.
5：Data Analysis Methods:
The performance of the antenna was analyzed based on the measured and simulated results, focusing on impedance bandwidth, axial ratio bandwidth, radiation efficiency, and gain.
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