Rachna Chaurasia

The telegraph equation and its solution by reduced differential transform method

One-dimensional second-order hyperbolic telegraph equation was formulated using Ohms law and solved by a recent and reliable semianalytic method, namely, the reduced differential transform method (RDTM). Using this method, it is possible to find the exact solution or a closed approximate solution of a differential equation. Three numerical examples have been carried out in order to check the effectiveness, the accuracy, and convergence of the method. The RDTM is a powerful mathematical technique for solving wide range of problems arising in science and engineering fields.

Effect of the Dimension of Feedline for the Enhancement of Bandwidth of Square Microstrip Antenna

The need for the development of wideband microstrip antenna has been very well recognized. The present-day researchers are focused on developing novel design of microstrip antenna which would provide a good wideband. In this paper, the geometry of a microstrip antenna has taken to be square and feeding method also changed which is responsible for broadband. The antenna is fed with microstrip line by keeping a stub at source junction. It is done to improve the impendence bandwidth by the width of the structure of feedline adjustment is performed. This paper presents the study of a compact square antenna to operate in the frequency range of X-band from 8 to 12 GHz. The prototype planer antenna exhibits an overall wideband of bandwidth 560 MHz with a good reflection coefficient of −25 dB. This type of antenna is very useful in many broadband applications in X-band.