(Complete seminar title is: Through-Barrier Electromagnetic Communication and Sensing: Advances in Wideband Radio-Wave Communications and Radar Imaging, Radio-Frequency (RF) Tags and Tera-Hertz (THz) Standoff Detection Spectroscopy) In many remote sensing problems there is a critical need to detect and image objects through barriers, such as buildings, with high reliability and resolution and at long ranges. A related problem is the wireless communication and geolocation of transceivers in harsh RF environments, such as in urban areas and underground caves, where conventional communications systems and GPS might not work. In this seminar, we will review some of the signal processing advances we have achieved in the past few years using ultra-wideband RF pulses to solve some of these problems. The focus of our work has been on employing adaptive signal array processing and tracking strategies to exploit the physics of the problem, and on keeping hardware to a form that is small and portable. Practical deployment systems must provide a design that is reliable, consumes low-power, and is low-cost. We will discuss novel communication modulation techniques, imaging, and long-range remote powering techniques. The designs have been built and tested for various applications. Finally, we will also discuss the important problem of standoff detection of high-explosives with THz electromagnetic pulses.