http://localhost:8080/xmlui/handle/123456789/213 2026-04-26T08:14:36Z http://localhost:8080/xmlui/handle/123456789/3252 Title: Packet data transmission in worldwide interoperability for microwave access with reduced peak to average power ratio and outband distortion using software defined radio Authors: ReddY, Bathula Siva Kumar; Lakshmi, B. Description: NITW 2015-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3246 Title: Poly Fractal Boundary Circularly Polarised Microstrip Antenna for WLAN/Wi-MAX Wireless Applications Authors: Reddy, V.V.; Sarma, N.V.S.N. Abstract: The design of circularly polarised multiband poly fractal boundary microstrip antenna is proposed and experimentally studied. Initially the two orthogonal sides of the square patch are replaced with different fractal curves for circular polarisation (CP) radiation. Along the x and y axes, Minkowski and Koch fractal curves are employed. A 45° rotated poly fractal slot is embedded at the center of the fractal patch for triband CP operation. The indentation depths and indentation angles of the Minkowski and Koch fractal curves are optimised for better CP emission. The inserted fractal slot redistributes the current elements on the patch for tri band CP radiation. The measured 3-dB axial ratio bandwidths of the proposed antenna at 2.4 GHz, 3.4 GHz, and 5.8 GHz are 1.53 per cent, 0.81 per cent, and 1.62 per cent respectively, making it an able candidate for WLAN and Wi-MAX wireless applications. Description: NITW 2015-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3245 Title: Circularly polarized frequency reconfigurable Koch antenna for GSM/Wi-Fi applications Authors: Reddy, Venkateshwar V.; Sarma, N. V. S. N. Abstract: A novel circularly polarized frequency reconfigurableKoch fractal boundary antenna is proposed. Initially, a Koch slot isetched on the Koch fractal boundary patch of larger dimension (48 348 mm2 ). Within the etched slot, an asymmetrical Koch fractal patch ofsmaller dimension (36 3 36 mm 2) is embedded and switches are intro-duced along x and y-directions to connect these inner and outer patchstructures. By making ON/OFF switching of the diodes frequency recon-figuration is achieved. Measured results are in close agreement with thesimulation results which demonstrates that the proposed antenna is wellsuited for GSM/Wi-Fi wireless applications. Description: NITW 2015-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3243 Title: Size miniaturization of slit-based circular patch antenna with defected ground structure Authors: Reddy, B. R. Sanjeeva; Vakula, D. Abstract: This letter proposes a novel compact circular patchantenna that is simulated, fabricated, and measured for different wire-less applications. Traditional circular antenna is modified with dual T-shaped slits placed on top and bottom positions, to obtain the tri bandresonant frequencies. Metallic ground plane behind the radiating patchis placed with a dual E-shaped defected ground structure (DGS) achiev-ing size miniaturization and bandwidth (BW) enhancement at dualbands. Antenna is well performed with and without placement of DGS interms of obtained gain. Shape, dimensions of the finite ground plane,and frequency shift property using defect on the patch are the key fac-tors in improving the BW and reducing the size. BWs of 3.9 and 3.6%are obtained for 1.56 and 2.47 GHz bands, respectively. The optimizeddimensions of DGS are selected without degrading the antenna perform-ance. This single layer probe feed antenna is analyzed, simulated usingIE3D tool and also performed experimentally. Frequency shift techniqueof DGS would attain compact antenna size and is also capable of pro-viding dual bands with better impedance matching and acceptable gain. Description: NITW 2015-01-01T00:00:00Z