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A right-handed circular polarization (RHCP) textile antenna for Global Positioning System (GPS) application is proposed. The circular polarization (CP) is achieved by truncated two opposite edged of the 84 mm square patch. The proposed antenna design use a shieldit super as the radiator and felt fabric as substrates. Such presented antenna attains a good bandwidth of 90 MHz from 1.53-1.62 GHz. Besides, the antenna is capable to perform an axial ratio of less than <3 between 1.56 and 1.62 GHz which covered the GPS operating frequency of 1.575 GHz. Moreover, this paper discussed the parametric study of the truncated patch in order to achieve CP. The simulated result shows that the presented antenna is potential for point-to-point wireless communication system.

This paper presents a reconfigurable frequency microstrip patch textile antenna using slotted technique. The switchable frequency is achieved by implementing three PIN diode switches at the slotted ground of the antenna. It is discovered that the switching element is capable to configure the frequency at six different states of operating frequencies between 1.575 GHz until 2.45 GHz. With certain switches configuration, the antenna is proficient to produce a dual-band frequency of band 1; 1.575 GHz and 2.45 GHz and band 2; 1.588 GHz and 2.36 GHz. Besides, the antenna has successfully perform an axial ratio of less than <3 dB at the GPS operating frequency of 1.575 GHz. A shieldit super is used for the antenna radiator and felt fabric as the antenna substrate. The design and simulated result shows that the presented antenna is potential to be implemented in GPS and Wi-Fi applications.

Abstract. An on-body location tracking system is developed and integrated with a wearable GPS antenna. Such system is beneficial in human location tracking of patients and elderly within a radius of 1 km. The system consists of a wearable antenna, a GPS module, a low cost microcontroller, two RF modules and a local monitoring system. A user equipped with the GPS antenna, GPS module and a RF transmitter is able send his/her location to the local monitoring system via a RF receiver. The proposed wearable antenna is validated to be safe for human use in terms of specific absorption rate (SAR). This antenna was then incorporated into the complete prototype and tested. Several suggestions for future improvements are also proposed and discussed.

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