Triple band operation for tuning 5 ghz for wlan application

This paper presents a novel geometry of design and development of stub and slot loaded circular microstrip antenna (CMSA) for triple band operation. The middle operating band in the triple band operation of the antenna can be tuned to cover entire upper band of WLAN range (5.74–5.82 GHz) by changing the width of slots from 0.3 to 0.8 cm without affecting the first and third band. Further, the tuning of middle band does not affect much the gain and radiation pattern of an antenna. This technique helps in rejecting the undesired frequency in the tunable range of an antenna to avoid interferences. The antenna has been designed by using low cost modified glass epoxy substrate material of thickness 1.6 mm and permittivity of 4.2. The antenna gives a peak gain of 2dB in its tunable band and shows nearly omnidirectional radiation pattern.