Design and Simulation of Microstrip Multiband Antenna for Wireless Applications

This paper proposes a compact sized dual band microstrip patch antenna with microstrip feed line. The patch of antenna is a rectangular shaped patch which has a circular slot in the patch for multiband operations. This antenna covers frequency bands, centered at 2.4GHz, 3.3GHz, which is useful for the C-band and X-band operations. In this paper, a microstrip patch antenna with compact size of 21x17x1.6 mm in rectangular shape. This antenna is designed on FR4 substrate (Dielectric constant=4.4) of thickness h=1.6mm with ground of size 25x10 mm. The proposed structure were simulated on CADFEKO simulation software. This proposed antenna is suitable for multiband wireless communication systems and mobile equipments

Mathematical Modeling, Control Design, Simulation & Implementation of Electric Vehicle Charger

A proposed technique to deal with improves the power factor of single-stage rectifiers and to control the load voltage against the adjustment in grid voltage and load is exhibited. This converter topology is assessed based on execution and its remarkable highlights like simple in construction, cost efficient and high degree of performance are communicated about to examine its correctness. The proposed control technique is bridgeless, transformer-less and output current sensor-less and comprises of just two Bi-directional IGBTs and two diodes. The voltage control is accomplished by a simple voltage divider to convey to a controller to control the duty cycles of pulse width modulated signal. This paper concentrated on the numerical displaying of single stage bi-directional converter utilized in electric vehicle.</jats:p