of \A Framework for Speech Source Localization Using Sensor Arrays," by Michael Shapiro Brandstein, Ph.D., Brown University, May 1995 Electronically steerable arrays of microphones have a variety of uses in speech data acquisition systems. Applications include teleconferencing, speech recognition and speaker identi cation, sound capture in adverse environments, and biomedical devices for the he...

Abstract: This paper describes the development and the realization of an adaptive antenna based on a reconfigurable parasitic structure. The geometry of the proposed antenna is circular, and it is composed by an active omni-directional radiator, surrounded by a number of parasitic elements that can be optically activated and configured as a director or as a reflector. The optical switches are a...

This author; a leading proponent of the transmission of power via microwave beams, describes how the common microwave oven magnetron can be externally locked to provide 30 dB of gain-resulting in a 500 watt, 70% eficient, $15, coherent microwave source. T he 2450 MHz magnetron which supplies 700 watts of average power to the ubiquitous microwave oven is made in a quantity of 15,000,000 units an...

Airborne Radar Simulation, in the present context, is the real-time generation of radar displays and other radar outputs, such as data exchanges with the flight computer or other avionics subsystems, consistent with the actual radar and in response to the interaction with the operator, ownship, targets, and the environment. The primary application is flight simulators for man-in-the-loop traini...

1. Introduction A direct broadcasting satellite(DBS) service via Koreasat 3 is currently provided and there are many subscribes for a residential house. In addition, many people want to watch the DBS TV even at vehicles because it has advantages over terrestrial TV broadcasting with high quality, simultaneity, wide coverage, and so on. Several antenna systems for mobile DBS reception have been ...

Radiator arrays with Dynamic Polarization Control (DPC) and 2D beam steering enable polarization matching to the receiver antenna regardless of its polarization, orientation, and location. A fully integrated 122.9 GHz 2x2 DPC multi-port driven phased array radiates all linear polarizations (0°-180° polarization angles) with axial ratios above 14 dB, and controls the axial ratio from 1.2 dB (cir...

We discuss the advantages of an electronically steerable interferometer of a million square meters collecting area operating at cm-wavelengths as a phased array and in conjunction with other antennas in VLBI mode. With a sensitivity to μJy-level flux densities, a brightness temperature limit of TB = 10 4 K, and an expected dynamic range in future VLBI images of better than 10, the impact of SKA...

This paper proposes a channel capacity maximization method for Multiple-Input Multiple-Output (MIMO) antennas with parasitic elements. Reactive terminations are connected to the parasitic elements, and the reactance values are determined to achieve stochastically high channel capacity for the environment targeted. This method treats the S-parameter and propagation channel of the antenna, includ...