ABSTRACT Characterizing spectral variability of radio sources is a technique that offers the ability to determine astrophysics intervening media, source structure, emission, and absorption processes. We present broadband (0.072–10 GHz) 15 peaked-spectrum (PS) with Australia Telescope Compact Array (ATCA) Murchison Widefield (MWA). These PS were observed quasi-contemporaneously ATCA MWA four six...

A wide-band phased array antenna with wide-angle scanning capability for mobile communication system is proposed in this article. An air cavity properly embedded into the substrate under each element. This method very simple and can efficiently enhance performance by improving impedance matching (WAIM) realizing beam-width of elements array. Besides, operating bandwidth also extended approach. ...

In this white paper we discuss strategies for a wide-band continuum and spectral line galactic plane survey in the l-band exploiting the power of the vla’s widar correlator for simultaneous high resolution observations of the h  21cm line, all four oh transitions, 18 radio recombination lines (both h and c), and the 1066mhz transition of formaldehyde. All other existing surveys of the galactic...