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Textile antennas are currently being researched and developed so that they can be integrated into clothing. In this paper, two textile antennas with cotton and silk substrate are presented. The antennas operate at GPS L1 frequency, which is 1.575 GHz. This paper discusses the effect of antenna parameters on free space and on-body conditions, and the effect of antenna bending. Based on simulation and measurement results, the parameter values obtained indicate that the antenna can operate properly at a frequency of 1.575 GHz and is safe to use on the body.

The evolution of Wireless Body Area Network (WBAN) is made possible due to the rapid growth of wireless network and constant miniaturization of electrical devices. However, designing an antenna that is suitable for WBAN applications is challenging as the antenna should has compact size, in addition to the ability to endure low power loss during transmission and has robust communication link. Thus, a miniaturized wearable Dielectric Resonator Antenna (DRA) capable of radiating circularly polarized (CP) wave is designed. The antenna designing is done by using CST software. A total of 140 simulations is simulated in order to obtain the desired results. The DRA is used, together with conformal copper strips and miniaturized copper ground plane. The single point fed antenna is excited by a unique capital F-shaped conformal copper strips. The CP DRA offers a simulated Axial Ratio bandwidth below 3dB of ~23.85%, which is much greater than what has been reported in the previous work, with bandwidth of S11 below −10dB ~ 16.066%. In addition, the antenna designed in this research project managed to achieve an overlapped bandwidth of ~14.10% (6.9GHz – 7.94GHz). A prototype antenna is fabricated to validate the simulation result. Thus, the antenna design in this research will be helpful towards the evolution of the WBAN.

Array antenna has been utilized in many radio telescope systems, especially for low frequency transient observation, to increase their resolving power. In this paper, a new method to determine the maximum resolving power of an array radio telescope based on the single antenna beamwidth is proposed. The method is derived from theoretical calculations combined with simulations. Statistical result shows that the equation inherits a standard error of 0.99, and hence is suitable to be used for rough calculation in determining an array maximum resolving power. It also can be used to estimate the maximum resolving power of an interferometer system with a slightly lower precision at very long baseline.

Dipole-based antenna has been widely used as the front end section of a radio telescope system, especially for low frequency observation. In this paper, a new method on designing dipole-based antenna for transient radio telescope system is presented. The method consists of three equations which were derived from statistical approach, by utilizing data from many antenna designs for different operating frequencies. Some of the designs have been constructed and measured, with frequency peak error down to 0.7%. These antennas have been utilized in some radio telescope systems, operated at National Space Center of Malaysia for solar monitoring.

Defected Ground Structure (DGS) has been introduced and used in developing microstrip patch antenna. DGS is implemented by etching off a shaped in the ground plane. In this paper, multi rings shaped DGS has been analyzed for WiMAX application at 3.65 GHz operating frequency. The effect on variation in the parameter study such us diameter of the rings, the width of each rings and introducing the gap on the ring the DGS antenna exhibits a reduction of 64.062% compared to the size of conventional antenna. The DGS method is suitable for mobile antenna application.