Comparative Analysis on Different Feeding Techniques of Textile Antenna for GPS-L1 Application

Abstract

This paper presents a comparative analysis of textile antenna using different feeding techniques for Global Positioning System (GPS-L1) application. Textile materials which are commonly used in the wearable application has gained much attention due to the flexibility and conformability characteristic of the antenna. Nevertheless, the flexibility of this antenna will introduce the bending and stretching element to its physical structure that may degrades the performance. To ensure the maximum power transfer takes place takes place between the source and the antenna, a suitable feeding method must be identified. In this paper, the microstrip feedline technique and coaxial feeding technique will be studied comparatively using Felt textile material as the substrate with the relative permittivity, ?r of 1.098 and tangent loss, ? of 0.0395. It is attached to a copper tape which act as the conductive material with thickness of 0.035 mm. Using Computer Simulation Technology (CST) Microwave Studio software, the result will be analysed comparatively from the performance validation in return loss, gain, bandwidth, directivity and radiation pattern

Wearable textile antennas: investigation on material variants, fabrication methods, design and application

“…Impedance matching is easily achieved using capacitively coupling radiators (Samal et al, 2014) or by adjusting the position of the feed point (Van Baelen et al, 2018;Sankaralingam & Gupta, 2010). In addition, the ground plane isolates the spurious radiation from the feed and results in better radiation performance (Pazil et al, 2021). Since flexible textile antennas are ergonomically more suitable for on-body operation, this feeding technique is not ideal.…”

“…However, microstrip feeding is suitable only for thin substrates, since the 50 microstrip line otherwise becomes very wide. Excitation of higher order modes follows as a consequence (Pazil et al, 2021). Undesired cross-polarization radiation also degrades efficiency and bandwidth performance.…”