A NOVEL APPROACH FOR COMPACT ANTFNNA WITH PARASITIC ELEMENTS AIMFD AT ULTRA-WIDEBAND APPLICATIONS

A novel approach for compact antenna with parasitic elements is proposed and investigated for Ultra-wideband applications. The proposed structure consist of a multiple rectangular parasitic elements etched on flame retardant (FR-4) substrate with 50 Omega feed line. Return loss (magnitude of S-11 < -10dB) and the simulated bandwidth of the structure is 3.0 GHz to 12.89 GHz with the fractional bandwidth of 124%. The overall volume of the structure has a compact size of 14*18*1.5 mm(3). The simulated result show that the maximum gain is 2.9 decibels with maximum radiation efficiency equal to 70%. The presented compact antenna with good radiation pattern satisfy the monopole characteristics. Measured and simulated Co-pol. and Cross-pol. are in relatively good agreement with the selected operating frequencies. In order to construct the layout and stimulate the antenna's characteristic behavior over the Ultra Wide Band frequency range, the CST simulator is used. The measured values validate the proposed antenna's attributes as forecasted in the CST simulation with minor deviations in frequencies. The proposed antenna's properties make it suitable for UWB frequency range which includes 3.5-5.5 GHz (WiMAX), 5.2-5.8 GHz (WLAN), 8-12 GHz (X-band), data links to satellites along with various applications in the wireless communication field.