We study the interaction of a mode propagating in a planar waveguide with a three--dimensional rectangular defect (protrusion or notch) in the structure. The scattering by the defect disturbes the propagation of the mode and light is coupled out of the waveguide. To investigate these phenomena we compute electric field distributions with the Green's tensor technique and show movies with varying...

We discuss the propagation of an electromagnetic wavepacket inside a rectangular waveguide, of the type employed in recent experiments on superluminal tunneling of electromagnetic signals. By exploiting the analogy between particle and photon tunneling, we consider both evanescent and growing waves inside the narrowed part of the waveguide. The Fourier expansion of such waves shows that the bar...

Silicon oxynitride rectangular optical waveguides have been fabricated by plasma-enhanced chemical vapor deposition and dry etching. The propagation loss and polarization dependent loss in as-grown samples show a substantial reduction after the samples have been annealed. Birefringence measurements before and after annealing on waveguides of different widths suggest that the waveguide modal bir...

A rapidly converging moment solution for electromagnetic seattenng by a single inductive post in a rectangular waveguide is obtained. The numerical results show good agreement with Marcuvitz’s data as ~ar as this data goes. Furthermore, Marcuvitz’s curves are extended to cover data for large posts. This new data should aflow one to design a simply constructed new type of narrow bandpass filter,...

question I am frequently asked is, “Why do the antenna dimensions in the W1GHZ Microwave Antenna Book — Online not include the probe dimensions (for the transition from waveguide to coaxial transmission line)?” The answer is that the transition is part of the transmission line, not the antenna, and does not directly affect the performance of an antenna. The transition may be right at the antenn...

Abstract—This paper presents the electromagnetic interference (EMI) shielding effectiveness of rice husk and carbon nanotubes (RHCNTs) composites in the X-band region (8.2-12.4 GHz). The difference weight ratio of carbon nanotubes (CNTs) were mix with the rice husk. The rectangular waveguide technique was used to measure the complex permittivity of the RHCNTs composites materials. The complex p...

In this paper a low profile, small size polygon slot CPW fed antenna for broadband application is presented. The proposed antenna comprises of simple polygon radiator and rectangular ground plane. It resonates at 4.9 and 8.4 GHz frequency where return loss is well below to -10 dB. The proposed antenna is designed with FR4 epoxy substrate having dielectric constant of 4.4 and loss tangent of 0.0...

This paper presents a compact antenna with co-planar waveguide (CPW) feed line for ultra-wideband (UWB) applications. The proposed consists of beveled radiating patch wide rectangular slit at its upper side and partial ground plane insertion symmetrically two-step tapers center sides, which provides operating bandwidth. is integrated narrow rectangular-shaped parasitic elements different length...

Birefringent optical waveguides find use in a large number of applications such as coherent optical communication systems, interferometric fiber optic sensors, and polarization sensitive integrated optical devices. These waveguides include various polarization-maintaining optical fibers such as elliptical core fibers, bow tie fibers, and side tunnel fibers and integrated optical waveguides such...