Compact antenna for higher order harmonic reduction using efficient defected ground structure

Abstract

To suppress higher order harmonic using Inverted “U” shapes defected ground
structure (DGS) with two symmetric inverted “L” shape stubs is presented here.
At first, a study was made on the resonant frequencies of traditional line feed
microstrip antenna. An Inset feed with inverted slots is introduced to eliminate
all the higher-order modes up to the third harmonics in the WiMAX Band.
To get wide-area stopband characteristics, dimensions and position of DGS and
stubs are optimized. The proposed DGS area along with the radiated patch is
more compact and stable rather than in a few reported articles. This microstrip
antenna is designed and perfectly matches the WiMAX frequency band (3.3-
3.7GHz) application while suppressing other frequencies. The proposed inverted
‘U’ shapes DGS are designed with an equivalent circuit. Finally, the proposed
Stub with DGS Antenna(SDA) is fabricated and measured. The proposed structure is verified with measurements and it has satisfactory gain, radiation pattern
and reflection coefficient at 3.5 GHz. The results illustrate that the antenna has
satisfactorily gained