Bandwidth Enhancement of Rectangular Patch Microstrip Antenna with parallel rectangular slots for WLAN Applications

摘要

Many applications require very broadband antenna, but the narrow bandwidth of a microstrip antenna restricts its wide usage. The aim of this paper is to enhance the bandwidth of rectangular microstrip patch antenna. For this purpose, we cut three rectangular parallel slots in the proposed antenna. The dielectric substrate material of the antenna is glass epoxy FR4 having ε_r=4. 4 and loss tangent 0.025. The performance of the final modified antenna is compared with that of a conventional rectangular microstrip antenna. The designed antenna has two resonant frequencies 4.49 GHz and 4.90 GHz. So this antenna is best suitable for the WLAN applications and IMT-band frequency operations. The designed antenna offers much improved impedance bandwidth 19.7%. This is approximately six times higher than that in a conventional rectangular patch antenna (Bandwidth= 3%) having the same dimensions.