Indian Journal of Science and Technology

Abstract

Objective: This paper suggests a small microstrip antenna with WLAN frequency rejection properties to avoid interference between UWB systems. Methods/Analysis: At initial stage the dimension of suggested antenna are calculated by the available formulae in the literature and then is simulated by HFSS which is based on FEM to get optimized dimensions. The features of the manufactured antenna are checked with E5071C vector network analyser and compared with software generated results for validation. Findings: This antenna comprises of “S” shaped slot etched on the patch of FR4 substrate on front side and ground is having steps on rear. Top and bottom of the substrate is covered with a dielectric material (Teflon) of different dimensions. By proper selection of dimensions of patch and positions of slot on the radiating patch, the broadband property and frequency notching is achieved. The bandwidth of the suggested antenna is found to be 88.7% with operating frequency band from 4.26 GHz to 11.06 GHz and frequency notching range 4.85-5.97 GHz is obtained. It is shown that the shifting of rejected frequency can be observed by altering the size and type of dielectric resonant material. The suggested antenna has a small size of 12 x 18 x 6.6 mm3 and discloses a maximum gain of 4.99 dB. Applications: The suggested antenna can be used to avoid the intervention between UWB systems and other existing systems in the operating frequency range 5-6 GHz.
Keywords: Dielectric Resonant Material, Frequency Notch, Microstrip Feed, Patch Antenna, “S” Shaped Slot