Development and performance analysis of conformal UWB wearable antenna under various bending radii

International Conference on Startup Ventures: Technology Developments and Future Strategies

社会科学（总论）

Prasad Gupta, Narbada^1 ; Kumar, Mithilesh^2 ; Maheshwari, Ranjan^2

Department of Electronics and Comm. Engg., ABES Engineering College, Ghaziabad, India^1

RTU, Kota, Rajasthan, India^2

关键词: Antenna efficiency;    Electrical characteristic;    Frequency ranges;    Performance analysis;    Radii of curvature;    RT-duroid substrates;    Simulated radiation;    Wearable applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/594/1/012025/pdf
DOI  :  10.1088/1757-899X/594/1/012025

学科分类：社会科学、人文和艺术（综合）

来源: IOP

【 摘 要 】

Antennas for off-body wearable applications needs to be flexible and its electrical characteristics should be stable in different body postures, different bending or stretching environments. Therefore, the designed antenna should be such that, even if the antenna is bent frequently, it should operate properly. In this paper, a conformal UWB antenna is reported which has been optimized to be conformal to any body shape and size. The proposed antenna has been designed on RT Duroid substrate with dielectric constant of 2.2 and loss tangent 0.0009. The thickness of the material is 0.127 mm. Due to low thickness; it can easily be bent and mounted on curved surfaces. The size of the antenna is 35 ? 31 mm2. To accomplish the design process, two different bending radii have been considered to bend the proposed antenna. The two bending radii of 25 mm and 50 mm have been chosen; one corresponding to the arm of a healthy child of around 5 years age and another corresponding to a healthy person of age about 35 years with medium built. The simulated radiation efficiency and total antenna efficiency are more than 60% for the bending at 25 mm and 50 mm radii in the UWB frequency range from 3.1 GHz to 10.6 GHz. The gain of the proposed antenna for both the bending radii is changing from 1.4 dB to 5.3 dB. The return loss of the proposed antenna is obtained for 25 mm and 50 mm bending radii of curvatures and it is below 10 dB in UWB range. A prototype of proposed antenna has been fabricated and tested on Rohde & Schwarz 40 GHz VNA. Measured results are in close agreement with simulation results.