Jyoti Ranjan Panda

Compact multiband CPW antenna with fractal stub

High Frequency Inset-fed compact CPW slot antennas a conventional wideband slot antenna with fractal stub modified by a parasitic line surrounding the fractal stub, affecting the multiband operation suitable for applications in wireless communication system. The proposed antenna resonates at four frequency bands at centre frequencies 4.25, 5.55, 8.5, 9.3 GHz. The first resonant band extends from 3.6GHz to 4.2GHz which is the operation band of wireless. Effectively consistent radiation pattern and gain have been observed. The proposed antenna is small and compact in size, providing consistent radiation pattern, broadband impedance matching and approximate gain characteristics. The proposed antenna is size reduction of 62.5%.

Flattened zero dispersion photonic crystal fibers with ‘Y’ shaped core

This paper presents two PCF structure with ‘Y’ shaped core. One structure has horizontal ‘Y’ and other has vertical ‘Y’ shaped core. Both the structure reports higher birefringence. Structure with vertical ‘Y’ shaped core has shown flattened zero dispersion at 1.33ßm and 1.55ßm. Besides two structures simulated ensures to be endlessly single mode fibers. However vertical ‘Y’ shaped core promises to be a better candidate for application in optical communication, optical sensors, medical purposes, soliton, supercontinnum generation and other non linear applications.

A compact microstrip line fed open-ended slot antenna with an inverted U-shaped stub in ground plane for application in WLAN systems

In the paper presented here, a microstrip-line fed open ended slot antenna is presented which is compact in size. This antenna has an inverted U-shaped stub rested with the help of two horizontal strips from the left and right inner sides of a rectangular slot cut in the ground plane. The dimension of the antenna is reasonably small i.e. (20×22 mm2). This antenna performs at two resonating frequencies i.e. at 2.38 GHz and 5.19 GHz and these two bands are operating for the 2.4/2.48 and 5.15/5.35 GHz wireless LAN application. The percentage bandwidths of both the resonance bands are 20.57 and 6.94 respectively. The gain varies in the range of 3 dBi to 3.2 dBi and 3.5 dBi to 3.6 dBi in the band of 2.38 GHz and 5.19 GHz respectively and these are enough for the operation in WLAN system. This proposed antenna shows a consistent co-polar as well as an allowable cross-polar i.e. the good radiation patterns for the desired bands of frequencies.

A compact coplanar waveguide-fed slot antenna with an inverted U-shaped stubs for WLAN application

A simple and compact coplanar wave guide (CPW) fed slot antenna with an inverted U-shaped stub design is presented here. The size of the proposed antenna is (18×18 mm2). It is simply composed of a square slot, an inverted U-shaped stub both in ground plane and a monopole radiator. Due to this new design the antenna can operate at two resonating frequencies i.e. at 2.38 GHz and 5.79 GHz. The prototype of this antenna is designed and simulated. After the simulation, results show the percentage bandwidths of 10.57 (at 2.38 GHz) and 6.88 (at 5.79 GHz) respectively for the proposed antenna. The value of the peak gains at 2.38 GHz and 5.79 GHz are 3.15 dBi and 3.39 dBi respectively which are sufficient for the operation of WLAN system satisfactorily. This proposed antenna demonstrates a consistent co-polar and permissible cross-polar radiation patterns in the desired bands of frequencies.

A compact printed inverted G-shaped monopole antenna for wireless applications

In this paper, a printed inverted G-shaped monopole antenna is proposed which is compact in size and fed by a microstrip feed-line, for wireless applications. The dimension of the proposed antenna is (20×20 mm2). It has two resonating frequencies one at 2.41 GHz and the other one at 5.10 GHz, which are operation band for the wireless LAN application. The percentage bandwidths at the two resonance bands are 20.83 and 35.40 respectively. The peak gain varies from 2.58 dBi to 2.57 dBi and 3.55 dBi to 3.55 dBi in the frequency range of 2.15 GHz/2.56 GHz and 4.40 GHz/6.25 GHz respectively. The value of peak gains at 2.41 GHz and 5.10 GHz are 2.60 dBi and 3.95 dBi which are sufficient for the operation of WLAN system satisfactorily. Consistent co-polar and permissible cross-polar radiation patterns are demonstrated by the proposed antenna in the desired bands of frequencies.

A compact truncated conical Dielectric Resonator Antenna with concentric cylindrical air gap for microwave application

A compact truncated conical Dielectric Resonator Antenna (DRA) is presented. The truncation at the upper side of the DRA makes it useful for the microwave application(X, Ku and K band). The antenna resonates at three frequencies of 12.9 GHz, 19.7 GHz and 23.5 GHz with good impedance matching. The gains at three resonant frequencies are more than 5 dBi. The antenna is excited with TM018 mode to give apple shaped omni directional radiation pattern for triple bands.