Kunal Srivastava

Design of Compact Penta-Band and Hexa-Band Microstrip Antennas

Abstract This paper presents the design of two multi-band microstrip antennas. The antenna-1 gives Penta-Band and antenna-2 gives Hexa-band in the WLAN band. The frequency bands of the antenna-1 are Bluetooth 2.47 GHz (2.43 GHz–2.54 GHz), WiMax band 3.73 GHz (3.71 GHz–3.77 GHz), WLAN 5.1 GHz (4.99 GHz–5.13 GHz), upper WLAN 6.36 GHz (6.29 GHz–6.43 GHz), C band band 7.42 GHz (7.32 GHz–7.50 GHz) and the antenna-2 are WLAN band 2.6 GHz (2.56 GHz–2.63 GHz), 3.0 GHz (2.94 GHz–3.05 GHz), WiMax band 3.4 GHz (3.34 GHz–3.55 GHz), 4.85 GHz (4.81 GHz–4.92 GHz), WLAN 5.3 GHz (5.27 GHz–5.34 GHz) and upper WLAN 6.88 GHz. Both the antennas are fabricated and their measured results are presented to validate the simulated results. Proposed antennas have compact sizes and good radiation performances.

Study of U-Slot Electromagnetic Band Gap Structure and Its Effect on Hexagonal Patch Antenna

This paper presents the analysis of electromagnetic band gap (EBG) structure using fractal geometry and simple mushroom type EBG and its effect on Hexagonal Patch antenna performance. The EBG structure attenuates the surface wave propagation in a specific frequency range. A new EBG structure is proposed to attenuate the surface wave better than 20 dB in frequency range from 3.1 GHz to 5.3 GHz. using this EBG structure, an antenna with center frequency of 3.8 GHz is designed. The bandwidth of this antenna is improved by 53.86 % in comparison to antenna without EBG. The simulated of radiation pattern with EBG exhibits reduction in backward radiation in comparison to radiation pattern without EBG.

Very Sharp Compact Microstrip Lowpass Filter

This paper presents a design of very sharp compact micro strip low pass filter. Performances of the filter are compared with elliptic LPF and DGS based LPF. Performances are, Sharpness of the filter is 121.4dB/GHz, 20dB stop band rejection up to 3fc, insertion loss in pass band is 0.17dB. Size of the LPF is 33% smaller than elliptic and DGS based LPF. Such type of filter could be used in modern communication systems.

Quad-band polarization independent ultra-thin microwave absorber using metamaterial

This paper presents a design of Quad-Band polarization independent microwave absorber using metamaterial. Presented absorber is used for C-band as well as for X-band application. The absorptivity level for frequencies 5.0GHz and 7GHz in C-band are 85% and 95% and for frequencies 9.8GHz and 10.8GHz in X-band are 88% and 90%. Such type of absorber could be used in modern communication systems for airborne and surveillance radar signal absorption application.

Compact UWB Antenna Using Chebyshev Coefficient Distribution

This paper presents a novel method to design an Ultra Wide Band (UWB) Antenna using coefficient distribution of the Chebyshev polynomial. Antenna impedance bandwidth is 8.7GHz (3.2GHz-11.9 GHz) that cover the entire UWB band that decide by FCC. Gain of the antenna varies from 4dB to 11dB with in the band. Antenna designed on the cost effective substrate FR4 with dielectric constant 4.4 and height of substrate is 1.59mm.