DESIGN AND ANALYSIS OF DEFECTED GROUND STRUCTURES INTEGRATED INSET FEED MICRO-STRIP PATCH ANTENNA AT 5.9GHZ FOR WI-FI BAND APPLICATIONS
Sanjeev Thapa1, Surendra Shrestha2, Ram Krishna Maharjan3
1Faculty of Science and Technology, School of Engineering, Pokhara University, Kaski – 33700, Nepal2,3Department of Electronics and Computer Engineering, Institute of Engineering, Tribhuvan University, Lalitpur- 284403, Nepal
ABSTRACT: This paper aims to design an optimized inset feed MPA for Wi-Fi band applications to resonate at 5.9 GHz. Defected ground structures (DGS) in dumbbell (DB) shape and Slot were etched to maximize the device’s performance; the impedance of the antenna was perfectly matched with the impedance of the micro-strip line at 50 Ω. Improved bandwidth was achieved compared to the state-of-the-art MPA reported. The design methodology of the proposed antenna proceeds with a simulation of conventionally computed inset feed MPA using Ansys HFSS. The rectangular slot and DB-shaped DGS were etched on the ground plane at the same positions. Their effects on the performances of the antenna are comparatively analyzed by varying the dimensions. Further, the conventional, optimized, and antenna integrated with DB-shaped and slot-type DGS were analyzed with a fabricated prototype built in the laboratory. The performances of the prototype of the proposed antenna were found to be in good agreement with the simulated one. The defects in the ground plane are utilized to reduce the resonating frequency, bandwidth was upgraded to 300 MHz, a gain of 4.7 dB was achieved at a minimum measured return loss of -33.16 dB and back lobes were reduced.
KEYWORDS: Bandwidth, Defected Ground Structure, Dumbbell, Micro-Strip Antenna, RF Energy, Wi-Fi Band