In the present work, a compact zig-zag shaped slit rectangular microstrip patch antenna with circular defected ground structure (DGS) is designed for wireless applications. The probe-fed antenna consisting of zig-zag shaped slit, dual Tshaped slits on either sides of a rectangular patch and circular dumbbell shaped defected ground plane is optimized. The antenna was able to generate three separate resonances to cover both the 2.45/5.28 GHz WLAN bands and the 3.5 GHz WiMAX bands while maintaining a small overall size of 40mm x 28mm x 3.175mm. The return loss impedance bandwidth values are enhanced significantly for three resonant frequencies. Designed antenna is characterized with better radiation patterns and potentially stable gain around 4-6dBi over the working bands. Good agreement was obtained between measurements and simulations.Index Terms-Defected ground structure, zig zag slit, Radiation pattern, Impedance band width.
A systematic method for the diagnosis of planar antenna arrays from far field radiation pattern using neural networks is presented. Two types of neural networks, Radial basis function (RBF) and Probabilistic neural network (PNN) are considered for the performance comparison. Deviation pattern is used as input to the neural network to determine the location of the faulty element and error in excitation.
In this article, a broadband gradient refractive index (GRIN) metamaterial is designed and used to enhance the gain of the tapered slot antenna (TSA). The proposed GRIN is implemented using nonresonant parallel‐line unit cell with different refractive index values. GRIN lens are placed in front of the tapered slot direction in the direction of x‐axis. The designed GRIN metamaterials have broad bandwidth (2‐12 GHz) characteristics due to the nonresonant parallel‐line elements which is suitable for the ultra‐wideband frequency band. The measurement results indicates that the radiated beam becomes more directive with narrow beam width. The measured reflection coefficient is below −10 dB over the frequency bandwidth of 3‐11 GHz. The peak gain of TSA is obtained up to 14 dB at 10 GHz using GRIN lens.
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