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The University of New Mexico (UNM) has two research thrusts in high power electromagnetics: (i) the development of novel sources of high power microwave (HPM) radiation with ever-increasing beam-to-microwave conversion efficiency in the frequency range from 1 GHz to over 100 GHz, and (ii) the development of physics-based predictive models on how electronics (and software execution) are affected when...
Antenna design at E-band frequencies is recently gaining more interest with the development of automotive radar applications and with research focusing on the possibility of using this frequency band for cell phone and data communication. At E-band frequencies, typical coaxial connectors cannot be used to feed printed antennas because their operation is limited to frequencies below 26.5 GHz. The use...
This paper presents an experimental setup for measuring the tuning time of an optically pumped reconfigurable antenna system. The reconfigurability in the antenna operating frequency is obtained by integrating silicon switches within its structure. The activation of this type of switching elements is obtained by integrating laser diodes with the antenna structure. A prototype antenna is fabricated...
This paper presents a new antenna scheme for cognitive radio communication. The antenna structure consists of two ports. The first antenna port is a UWB structure for channel sensing while the second one is a reconfigurable structure for communication. The reconfigurability is based on integrating laser diodes within the antenna substrate in order to activate the photoconductive switches. A prototype...
This paper presents a new technique for measuring the switching speed of reconfigurable antenna systems driven by semiconductor-based photoconductive switches. Laser diodes are integrated within a stripline transmission line in order to efficiently illuminate the incorporated photoconductive switches. An experimental setup and measurement technique for estimating the ON←→OFF transition speed of the...
This paper presents a reconfigurable radio front-end antenna scheme suitable for cognitive radio communications. Our scheme comprises of an UWB antenna structure (antenna-1) and a reconfigurable antenna structure (antenna-2) incorporated together on the same substrate. The UWB antenna-1 is used for channel sensing while the reconfigurable antenna-2 is designed to frequency-hop between pre-determined...
This paper examines the applications of statistical physics-stochastic processes, ergodic principles, the use of nonlinear dynamic state equations and chaos, and the Wiener-Khintchine theorem to better explain how Intentional ElectroMagnetic Interference (IEMI) disrupts the performance of feedback and hybrid electronic systems such as control systems, power electronics and SCADAs. The origin of spurious...
This paper presents a new reconfigurable antenna design using optical switching which overcomes any biasing associated with standard MEMs and PIN switches. In our approach, the switching elements comprises of doped silicon, and the change in the element's RF conductivity from that of a semiconductor material to that of a metal-like material is achieved upon exposure to a laser light coupled through...
This letter presents a novel frequency reconfigurable antenna design using photoconductive silicon elements as optical switches. By illuminating these silicon elements with light of suitable wavelength, their physical properties can be altered from that of a semiconductor to almost metal-like, which in turn alters the radiation properties of the antenna structure. Our work builds on similar work conducted...
We are at the crossroads of some fundamental changes that are taking place in the semiconductor industry. Power is a primary design criterion for bulk of the semiconductor designs now and a key reason behind the shift towards multicore designs as increase in power consumption limits increases in clock speed at the rate we have seen in the past.Voltage is the strongest handle for managing chip power...
This paper addresses the verification of a modern multi-core SoC using an approach that quantifies the verification problem and defines its solution. We show how to analyze a specification to create a verification plan that describes the verification problem, quantifies it using measurable metrics, specifies the solution to the problem, and facilitates automation of functional closure. Specifically,...
Power consumption has become one of the most important differentiating factors for semiconductor products. Voltage is the strongest handle for managing chip power consumption. We look in detail at some of key power management techniques such as power gating, adaptive voltage scaling and active body-bias that leverage voltage as a handle. We discuss the implications of power management architecture...
Semiconductor designs are continuously growing in complexity. It is no longer practical to view large swaths of waveforms at one time. Dataflow and bus transactions must be presented to engineers in way that will stimulate their creative juices and empower an intuitive understanding of the big picture without unnecessarily cluttering the debug environment. Over time, as technologies enable advanced...
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