DESIGN AND FABRICATION OF ULTRA WIDE-BAND ANTENNA WITH BAND NOTCHING PROPERTY

Abstract

In this paper, a microstrip feed line antenna with defected ground plane for ultra-wide band (UWB)
application is presented. Insertion of defected ground plane just beneath the radiating patch, results in UWB
characteristics. A big challenge in the design of a UWB antenna is to avoid the interference from narrow band systems
like WLAN operating in the environment so that UWB technology can be operated in parallel with other existing
systems. To solve this problem the UWB antennas one should have band notching properties for the minimization of
the interference from other active environment. DGS affects the current distribution and hence antenna performance
parameters, therefore in order to achieve band notching at WLAN frequency, a patch antenna with defected ground
structure just beneath the radiating patch is designed using HFSS 13. In this proposed thesis we have designed “U”,
“W” and “B” shaped slots whose length and width are varied with reference to DGS to achieve the desired UWB
band notch characteristics. Return loss of -25 dB is achieved and smooth VSWR below 2 is achieved throughout the
band from 3.1 to 10.6 GHz except for band notch region. Gain of 1 dB to 5 dB over is reported for complete Ultra
Wide Band except for WLAN region which is notched. Antenna is fabricated with Roger 4003 material having
dielectric constant 3.55 thickness1.524. The thesis contain the simulated results of designed antenna which has overall
size of 2x2cm2
and can be used in UWB technology as antenna achieve good result.