Bending Analysis of a Dual L-shaped Slotted Circularly Polarised Wearable Textile Antenna for GPS Application

This work presents a single-feed circularly polarised (CP) textile antenna analysed for 0° to 35° degrees curvature bent angles around E-plane and H-plane configurations. The design consists of two truncated corners with dual L-shaped slots to achieve the Right – Hand Circular Polarization (RHCP) dominant using Felt as a substrate and ShieldiT Super as the radiating element. In this paper, the antenna bending effects particularly the frequency detuning are analysed and compared with the initial performance in flat conditions. A normalised frequency shift of less than 5% has been reported and discussed along with the numerical result of axial ratio, radiation pattern and CP characteristics. This study indicates that the frequency shift is more significant in the E-plane bent condition. On the other hand, the axial ratio is sensitive during bending in both planes and has changed the polarisation characteristic.