Design of Multi band Notched U-Shaped Microstrip Antenna

Abstract

In this a compact modified U-Shaped design with coplanar waveguide (CPW) fed triple band notched antenna was proposed. The proposed antenna, with compact size of 24×33 mm 2 , yields an impedance bandwidth of 120%(S11<-10dB criteria). The notched bands are realized by introducing two different types of slots. Two C-shaped half-wavelength slots are etched on the radiating patch to obtain two notched bands in 3.3-3.7 GHz for WiMAX and 7-7.75 GHz for downlink of X-band satellite communication systems. In order to minimize the mutual coupling between the band-notched structures, the middle-notched band in 5.5-5.8 GHz for WLAN is achieved by using a U-slot defected ground structure. The parametric study is carried out to understand the mutual coupling. The performance of the antenna is evaluated in terms of return loss(S11), VSWR and Radiation Patterns.