Abstract— Equivalent charge method is used to design ultra wide band asymptotic conical dipole (ACD) antenna. Combination of linear charge density and point charges is used to generate different profiles for ACD antennas. Two different profiles of ACD antenna are used as a feed for reflector based impulse-radiating antennas (IRAs). This paper focuses on the selection of ideal ACD profile as wel...

P2ww'd'el e @@& .4 paraboloidal reflector antenna fed by a pyramidal horn has found widespread application in radar and communication engineering. However, the reflector antenna has very useful characteristics when it is fed or illuminated by two or four-conductor transmission lines. We have am.lyzed, designed, fabricated, and tested a reflector antenna fed by a pair of conical transmission Iin...

Light-trapping structures are more demanding for optimal light absorption in thin film silicon solar cells. Accordingly, new design engineering of solar cells has been emphasized and found to be effective to achieve improved performance. This paper deals with a design of thin film silicon solar cells and explores the influence of bottom grating and combination of top and bottom (dual) grating a...

Online hosts and networks are easy targets of network attacks due to their static nature, which creates an information asymmetry and makes them easy to attack and hard to defend. To break the asymmetry, Moving Target Defense was proposed to bring uncertainties to computer systems. It can be applied to all levels of protections, covering applications, system software, operating systems, and netw...

OBJECTIVE To compare learning styles of undergraduate and postgraduate medical students. STUDY DESIGN Observational, comparative study. PLACE AND DURATION OF STUDY Department of Medical Education, Army Medical College, NUST, Rawalpindi, Pakistan, during February and March 2012. METHODOLOGY A total of 170 students were divided into two equal groups of undergraduate students of Army Medical...

This document describes the design, fabrication and measurement results of the CART Mk2 10 m radio reflector prototype constructed at the Dominion Radio Astrophysical Observatory. Introduction The Composite Applications for Radio Telescopes (CART) project at the Herzberg Institute of Astrophysics’ (HIA) Dominion Radio Astrophysical Observatory (DRAO) in Penticton Canada is an ongoing effort to ...

Solar simulators are common laboratory devices to artificially reproduce the Sun emission spectrum. Their use in optic tests allows to study the effect of the solar radiation on both materials and components. This paper focuses on the effective design of the ellipsoidal reflector for concentrating solar simulators. A ray-tracing analytic model integrated to Monte Carlo simulation is proposed as...

The Log-2 portable xenon arc light coagulator (Fig. i) was developed (O'Malley, 1971) in an attempt to simplify the operative procedure and to make this form of therapy more widely available. The key to the small size of this instrument is a parabolic reflector built into the lamp (Fig. 2). The reflector redirects the radiation so efficiently that a I50 watt lamp performs the same function as t...