Kumar Goodwill

Dual band microstrip patch antenna for wireless applications at 5.2 GHz and 5.8 GHz using CSSRR

This prototype antenna design was targeted for WiMAX applications at 5.2 GHz and 5.8 GHz. Patch antenna size reduction is achieved in this work. To realize a dual band operation for WiMAX application at 5.2 GHz and 5.8 GHZ, ground plane loaded with CSSRR has been proposed. The proposed antenna provides good flexibility on selection of dual frequency operation by modifying dimension of CSSRR and patch. The antenna was designed using CST V.9 simulator.

A compact narrow band microstrip bandpass filter with defected ground structure (DGS)

In this paper, a compact narrow band bandpass filter is proposed with hexagonal dumbbell shaped defected ground structure in ground plane of a 50Ω microstrip line and a closed loop resonator in the conducting strip. This arrangement provides better coupling in pass band. Using DGS structure, forward transmission loss (S21) is -0.5 dB and return loss (S11) is -26.7 dB at the centre frequency 5.4 GHz with narrow bandwidth of 500 MHz. A conventional parallel coupled line bandpass filter has also been implemented with exactly same design goals for the sake of comparison. The proposed bandpass filter with DGS is quite promising with 60% size reduction.

A CPW fed antenna design for UWB-MIMO communication system for high isolation

A compact planar monopole ultra wide band (UWB) antenna is described with coplanar waveguide (CPW) feed for MIMO applications. The radiator and ground plane of the antenna are etched onto a piece of substrate with an overall size of 28.5mm × 42mm × 1.524mm. Implication from simulation shows that the antenna achieves a broad operating bandwidth of 3.2-10.6 GHz for a -10 dB return loss and Comb shaped DGS has significantly reduced the correlation of MIMO system. The antenna features Omni-directional radiation pattern with high radiation efficiency of 73.3% to 97.2% across ultra wide band bandwidth.