Pranaw Kumar

Design of double C-shaped microstrip antenna for application in UWB region

We have investigated a unique design of microstrip antenna with dual band. The designed antenna constitutes of two C-shaped slots on patch. The C-shaped slots are arranged such that they form the mirror image of each other. The spacing between the two slots is chosen of 0.1cm. The proposed design reports a dual band with resonating frequency lying in ultra wideband region. The optimum gain reported for designed antenna is 6.1869dB. The return loss observed for antenna is -24.0982dB. Besides we have investigated VSWR which reports to be 1.0852.

A unique design of PCF with zero dispersion and high birefringence

In this paper an unique design of photonic crystal fibers (PCFs) has been investigated which contains a predefined arrangements of circular and elliptical air holes. The structure has reported zero dispersion at first and second optical window. Moreover a high birefringence with low loss has also been reported. We also have studied the properties like normalized frequency for the designed fiber.

Negative Dispersion with High Birefringence Photonic Crystal Fiber and its Propagation Properties

In this paper we show a comparison of two hexagonal geometries of Photonic Crystal Fiber (PCF). These geometries are different with respect to the area of circular air holes. The area of circular air holes is kept fixed for a structure and is kept decreasing with increase in number of rings for another structure. Both structure considered consists of seven rings. One of the PCF structure with decreasing area of circular air holes report negative dispersion for wide range of wavelength. The birefringence of PCF structure with decreasing area of circular air hole is high compare to that of other PCF structure investigated. The confinement Loss reported is of the order of 10-5 for both the PCF structure in this paper. The confinement factor was reported to be uniform for all the structures in this paper. The mode field pattern for both the structures appears to be a flower like shape with entire field being concentrated in the core and without leakage to cladding. The far field pattern (FFP) is also observed for both the structures.

Soft glass PCF with low dispersion and high birefringence

Two Photonic Crystal Fibers (PCFs) structure has been investigated. One of the PCFs structure has ethanol as the wafer, where as the other structure has soft glass as the wafer. Both the PCFs structure has seven ring of circular air holes. The first structure has shown very low dispersion at the first optical window. The second structure reports an anamolous dispersion behavior. A very low loss and high birefringence was observed for the second proposed structure.

Applications of photonic crystal fiber for high speed transmission and optical devices

This paper presents a new Photonic Crystal Fibers (PCFs) with all its diagonals having circular air holes. All other air holes are of elliptical geometry. Area of both the geometry are kept same. Investigated results shows that the designed fiber is eligible for high data rate transfer and for making optical sensors and devices. However dispersion reported at both the first two optical windows is very low. Moreover birefringence reported at the second optical window is comparatively higher. Besides we have studied normalized frequency, modal index number of the designed fiber.

Design of a unique microstrip patch antenna with optimum gain

We have investigated a unique design of microstrip antenna with four elliptical slots of equal size. The geometry is made such that each elliptical slot is perpendicular to each other. The designed antenna has been simulated using HFSS software. It reports the VSWR value to be 1.0978 which is in the case of perfect matching. Moreover, the return loss observed is about -26.6247dB at an optimum frequency of 1.9425GHz. The gain calculated was 7.8355dB and the radiation pattern shows that all the energy is being radiated in one direction. Besides, smith chart has also been investigated.

Designing photonic crystal fiber for optical sensor and medical application and suitable for wavelength division multiplexing systems

Simulation results of a Photonic crystal fibers (PCFs) structure with two elliptical holes and circular holes have been studied. Area of elliptical holes are sixteen times more than that of circular holes. The simulation results shows that designed fiber can have wide application in various linear and nonlinear applications. The birefringence reported is very high and is of the order of 10-2. Dispersion observed at all the four optical windows is very low. However the reported dispersion is below 20ps/nm - km. Thus designed fibers can be used for optical sensor, optical switching and broadband amplification and other nonlinear properties. Besides we have studied confinement loss and normalized frequency of the designed fiber.

Designing microstrip antenna with octagonal bounded elliptical slots

A new design of microstrip patch antenna has been investigated. The patch structure is chosen such that two elliptical slot of equal area has been bounded by an octagonal shaped geometry. The designed antenna reports a VSWR of 1.07 at resonating frequency of 836GHz. The observed return loss at the same resonating frequency is -23.28dB. Besides these gain and radiation pattern of the antenna has also been studied.

Design of a quadruple band microstrip antenna for application in UWB region

We have investigated a unique design of microstrip patch antenna. The design of patch consists of four different geometry cut-out having equal area. The geometry includes square, rectangle, circle and ellipse. The simulated results of the proposed antenna shows its wide application in ultra wideband region. Moreover, the designed antenna has reported a quadruple band. The reported resonating frequencies are-3.8800GHz, 6.3100GHz, 8.5150GHz and 9.3700GHz. Besides the reported return loss is -23dB. The designed fiber reports a bandwidth of 630MHz at a resonating frequency of 9.3700GHz. The observed VSWR value for the designed antenna is 1.1362. We have also studied the radiation pattern of the designed antenna.

Multi-core ethanol doped PCF with anomalous dispersion behavior

Multi-core Photonic crystal fibers (PCFs) has been investigated in this paper. The structure has core doped with ethanol. Anamolous dispersion behavior was observed for the first and second optical window. Moreover it has reported high birefringence. Moreover normalized frequency and loss for the designed PCFs has also been studied.