Jibendu Sekhar Roy

Dispersion characteristics of curved microstrip transmission lines

An empirical expression for the effective dielectric permittivity of curved microstrip transmission lines is derived. This expression is very general because it can also be used for rectangular microstrip lines by considering a rectangular line as a curved line of infinite radius of curvature. The closed-form expression for the frequency dependence of the effective dielectric permittivity of a rectangular microstrip line is compared with other available results. This expression for the frequency dependence of the effective dielectric permittivity of curved microstrip transmission lines is simple, accurate, and suitable for CAD implementation. The measured and computed results for various curved microstrip lines are compared, and excellent agreement between the two is obtained. >

Some Investigations on the Effect of Aspect Ratio on the Impedance of a Microstrip Antenna AT TM11 Mode

Previous experimental investigations revealed that by properly locating the feed along one of the radiating edges of rectangular microstrip antenna, 1:2 VSWR bandwidth can be improved considerably at TM11 mode. In this paper, keeping the location of the feed at a suitable point the effect of the variation of aspect ratio of the patch has been investigated. Further improvement in 1: 2 VSWR bandwidth with the change of aspect ratio has been observed and the measured data has been presented. These experimental results have been verified by FDTD method. Measured radiation patterns have also been presented alongwith theoretical computation by cavity model.

High-frequency behaviour of curved microstrip lines

A closed-form empirical expression for the effective dielectric permittivity of curved microstrip transmission lines is derived which is very general, simple and accurate, and using this expression...