Sachidananda Padhi

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We present an in-situ antenna characterization method and results for a “low-frequency” radio astronomy engineering prototype array, characterized over the 75-300 MHz frequency range. The presence of multiple cosmic radio sources, particularly the dominant Galactic noise, makes in-situ characterization at these frequencies challenging;(More)
The SKA is a next generation radio telescope employing phased aperture arrays at its lowest operating band (SKA-low) of 70-450 MHz. SKA-low is a dual-polarized array consisting of antenna elements with stable impedance and low cross-polarization. We select the well-known broadband conical spiral antenna and its dual-polarized derivative to be evaluated as(More)
Progress in micro- to millimeter-wave technologies have made possible advanced diagnostics (imaging) for various applications, such as, plasma diagnostics, radio astronomy, alien substance detection, airborne and spaceborne imaging radars called as synthetic aperture radars, living body measurements. In this report we focus on the reflectometric (radar)(More)
This paper presents experimental performances of the algorithm used for detection of malignant tissue in breast. The algorithm uses ultra-short pulse radar (USPR) technique along with confocal microwave imaging (CMI) algorithm based on synthetic aperture radar (SAR) to detect tumor cells or tissue. A compact Vivaldi antenna having ultra-wideband (UWB)(More)
Next generation wireless communication epoch establish significant developmental platform on characterizing and designing of Smart antenna, as it enhances the performance of mobile communication systems, by increasing channel capacity, spectrum efficiency, coverage range and steering multiple beams to track multiple mobiles. The most important feature of a(More)
In broadband wireless system, the signal energy is scattered and reflected from objects in the environment, components of the signal arriving at the receiver are spared out over a longer period of time than is desirable. The challenge is then to provide a high performance reliable data link that can operate with the restricted receiver power levels, severe(More)
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