An increasing number of systems and applications depend on photonics for transmission and signal processing. This includes data centers, communications systems, environmental sensing, radar, lidar, and microwave signal generation. Such systems increasingly rely on monolithic integration of traditionally bulk optical components onto the chip scale to significantly reduce power and cost while sim...

Propagation of electromagnetic pulses in transmission lines, waveguides, and optical fibers is an important topic in the design of telecommunication, signal-processing, and VLSI systems. Modern undergraduate and graduate programs in Electrical and Computer Engineering often include this topic in their curricula. Static displays of scalar or vector fields are usually not sufficient to illustrate...

An electromagnetic band gap (EBG) material is a periodic surface specifically designed to have certain electromagnetic properties at specific frequencies. The term “metamaterial” is sometimes used to describe such engineered surfaces. Metamaterials (“meta” means “beyond” in Greek) are man-made materials not found in nature and designed by placing tiny resonant structures at regularly spaced dis...

A new type of backward-wave coupled-line directional coupler with complete coupling and broadband, which is composed of a conventional microstrip and a 1D mushroom structure, is proposed. The 1D mushroom structure is employed for a double negative (DNG) transmission line. The coupler exhibits unusual characteristics such as complex propagation. The complex propagation constant of the coupled mo...

Following the increasing popularity of unmanned aerial vehicles (UAVs) for remote sensing applications, the reliable operation under a number of various radio wave propagation conditions is required. Assuming common outdoor scenarios, the presence of trees in the vicinity of a UAV or its ground terminal is highly probable. However, such a scenario is very difficult to address from a radio wave ...

The impact of including the diffraction loss in the interference modeling on the system throughput is assessed in the context of cognitive Ka-band satellite systems. In particular, we focus on the cognitive satellite downlink, where Geostationary (GEO) Fixed Satellite Service (FSS) terminals receive interference from the incumbent Fixed-Service (FS) microwave links. We present numerical results...

Multiple antenna systems can offer significant improvements in system performance due to their ability to exploit multipath signal propagation and take advantage of its random nature in order to achieve diversity or spatial multiplexing gain. As such, they are very suitable for implementation in WiMAX (Worldwide Interoperability for Microwave Access) systems to improve its performance in harsh ...

The ability to manipulate light at deeply sub-wavelength scales opens a broad range of research possibilities and practical applications. In this paper, we go beyond recent demonstrations of active photonic devices coupled to planar plasmonic waveguides and demonstrate a photodetector linked to a two conductor metallic slot waveguide that supports a mode with a minute cross-sectional area of ∼ ...

The paper discusses several effects influencing the propagation in a laboratory wireless test bed, and also aspects important for designing and setting up the wireless test bed with space constraints. A numerical electromagnetic model for the full scale 7×7 wireless mesh network test-bed is discussed. The model includes the coupling and diffraction effects, and is based on the method of moments...

In this paper, we analyze the effect of the redistribution of the transmembrane ion channels in an axon caused by longitudinal acoustic vibrations of the membrane. These oscillations can be excited by an external source of ultrasound and weak microwave radiation interacting with the charges sitting on the surface of the lipid membrane. It is shown, using the Hodgkin-Huxley model of the axon, th...