Ali Elrashidi

The Effect of Mutual Coupling on a Microstrip Printed Antenna Array Operates at 5 GHz Using Three Different Substrates

Curvature has a great effect on fringing field of a microstrip antenna. Consequently, the fringing field affects the effective dielectric constant and then all antenna parameters. A new mathematical model for return loss mutual coupling coefficient as a function of curvature for two element array antenna is introduced in this paper. These parameters are given for TM10 mode and using three different substrate materials RT/duroid-5880 PTFE, K-6098 Teflon/Glass and Epsilam-10 ceramic-filled Teflon.

Variable Delay Optical Buffer Using Tunable Fiber Bragg Gratings

A novel all-optical variable delay buffer for next generation optical networks is reported. This buffer can store the contending packets for a relatively long time by using fiber Bragg gratings (FBGs). The proposed design is characterized by the ability to extract the delayed packets as soon as the contention is resolved.

Performance Analysis of a Microstrip Printed Antenna Conformed on Cylindrical Body at Resonance Frequency 4.6 GHz for TM01 Mode

Curvature has a great effect on fringing field of a microstrip antenna and consequently fringing field affects effective d ielectric constant and then all antenna parameters. A new mathematical model for inpu t impedance, return loss, voltage standing wave ratio and electric and magnetic fields is introduced in this paper. These parameters are given for TM01 mode RT/duroid-5880 PTFE substrate material. The range of operation is around 4.7 GHz.