Abstract—

This paper proposes a new soft-switched continuousconduction- mode (CCM) boost converter suitable for high-power applications such as power factor correction, hybrid electric vehicles, and fuel cell power conversion systems. The proposed converter achieves zero-voltage-switched (ZVS) turn-on of active switches in CCM and zero-current-switched turn-off of diodes leading to negligible reverse-recovery loss. The components’ voltage ratings and energy volumes of passive components of the proposed converter are greatly reduce ....etc

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Presented by
BIRAJ MOHAPATRA


DEVELOPMENT OF HIGH PRECISION SLOTTED ARRAY WAVE GUIDE ANTENNA FOR AEROSPACE APPLICATION
INTRODUCTION:
Missiles are guided towards the target through the seeker. Mono pulse antennas give the location of target. Thus tracking of the target depends upon the performance of the antennae.
The slotted wave guide array antenna offer various advantages like planar configuration and compact structure.
The performance of these antennae depends upon various parameters like slot ....etc

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The Carpet Loop II is an ideal step upward for the listener who wants something better than a random wire but doesn't want the expensive dice roll of an active antenna.

The Carpet Loop is made up of two components: A tuner, and the antenna cable itself; the cable can be either 5-conductor rotator cable or 4-conductor flat phone cable, both readily available from Radio Shack and elsewhere. The tuner couples the antenna to the radio, forming a (giant!) L-network. To tune the antenna, you turn a switch for best reception.

While NO antenna c ....etc

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This circuit shows an active antenna that can be used for AM, FM, and shortwave (SW).
On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. http://hard-core-dxnordicdx/antenna/hidden/active2.gif
This circuit is designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios.
L1 can be selected for the application. A 470uH coil works on lower frequencies ( AM ). For shortwave, try a 20uH coil.

The unit can be powered by a 9 volt battery. If a power sup ....etc

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Abstract
A new printed antenna system mounted in an aperture in the roof of a car is evaluated for broadcast signal reception from 88-108 MHz. Results from simulations on the vehicle are compared with measurements. The overall performance of the antenna is also compared to common types of vehicle antennas, the roof monopole and a glass based antenna. Overall the average gain of the antennas was better than -3 dBi for vertical polarization and -10 dBi for horizontal while the input return loss was generally better than -2 dB before matching sec ....etc

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The Bird Feeder shortwave antenna is a vertical cage wire antenna.
A What? you might ask.
Imagine if you will eight flexible wires, evenly spaced in a circular pattern, much like a ground plane. Draw these wires vertically to form a wire 'tube' and connect them together with a ring at the top. Now imagine these wires inside a telescoping PVC mast. Top that off with a bird feeder. Now, instead of a ground plane system with radials you have to put in (the neighbours are watching), you have this 'wire tube' constructed as a vertical dipole. At ....etc

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A Broadband and High-Gain Metamaterial Microstrip Antenna


Resultant Direct and Indirect Publications
Resulted in from the supported Projects: AOARD-07-4024 and AOARD-09-4069, the fol-
lowing research papers were published:
• Le-Wei Li, Ya-Nan Li, Tat-Soon, Yeo, Juan R. Mosig and Olivier J.F. Martin, “A
Broadband and High-gain Metamaterial Microstrip Antenna,” Applied Physics Letters,
vol.96, no. 6, 164101, April 2010


Background Introduction
A ....etc

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Abstract

The rapidly increasing demand for PCS has provided the impetus to design adaptive antenna arrays to improve spectral efficiency and enhance system capacity. With increasing data rate in some PCS application like DECT( Digital European Cordless Telecommunications), higher BER would degrade the system performance further. An adaptive antenna array testbed using 12 elements was built to evaluate its performance on high data rate mobile communications in an indoor environment for DECT applications. The simultaneous data sampling rate ....etc

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difference between plasma antenna and taditional antenna
....etc

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An automotive AM/FM hidden antenna using the slot between the body of the automobile and a metal solar heat-reduction film in the front windshield is described. Such solar heat-reduction metal films are becoming common and thus represent an opportunity to incorporate an antenna at only marginal cost. The radio frequency (RF) input impedance and gain patterns are described, and techniques for impedance matching are shown. ,Theoretical and experimental antenna patterns are compared in this seminars,The application of this mobile system to the me ....etc

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