Umbeli T Ahmed

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A compact wideband in-phase power divider is presented. The proposed device utilizes parallel coupled microstrip lines, connected in cascaded configurations, and a stepped impedance T-junction of microstrip line. To achieve tight coupling for wideband performance, a slotted ground is utilized under each of the parallel coupled lines. Moreover, chip(More)
The design of a compact high power in-phase power divider with planar structure is presented. The proposed device utilizes a stepped impedance T-junction of microstrip line and a pair of three parallel coupled microstrip lines. To realize the required tight coupling for wideband performance, each of the side coupled lines are shorted to the ground.(More)
Convex optimization provides a method of minimization of a convex objective function subject to a convex domain imposed upon it by the problem. For microwave imaging in medical applications, such as head imaging, this technique is seldom investigated. In this paper, a microwave-based head imaging method based on convex optimization is presented. Convex(More)
A broadband monopole antenna with unidirectional radiation is presented. The antenna is specifically designed for microwave systems aimed at the detection of heart failure. A reflector is added to the ground plane of the antenna to both enhance the bandwidth and directivity of the antenna. By the carful design of the radiator and reflector, the antenna(More)
An in-phase power divider with high power handling capability is presented. The proposed design is a modified structure of the traditional Gysel design. The modification includes using microstrip to slotline transitions to connect the input port to the two output ports with the aim to match the ports across wide band. As with the conventional design, the(More)
Background: The cesarean section is indicated when vaginal delivery is not safe for the mother or the baby. Objective: A descriptive study done in Omdurman maternity hospital–OMH to assess the impact of spinal anesthesia (SA) on cesarean section(C/S), including, intra and post operative maternal complications, neonatal outcome and patients’ satisfaction in(More)
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