The main goal of this paper is studying the composite material behavior under microwave which they used in antennas reflectors. For that, a transmission line method based on X- band WR90 rectangular waveguide used. Bi-anisotropic electrical properties are defined as tensors finite element model. fibers single layer oriented different directions. S-parameters (S11 and S12) calculated using COMSO...

This paper presents a 500-600 GHz submillimeterwave MEMS-reconfigurable phase shifter. It is the first ever RF MEMS component reported to be operating above 220 GHz. The phase shifter is based on a micromachined rectangular waveguide which is loaded by 9 E-plane stubs, which can be individually blocked by using MEMS–reconfigurable surfaces. The phase-shifter is composed of three metallized sili...

A method is described for designing high-efficiency rectangular horns that results in more compact horns than those obtained by using conventional linear tapers or steps. Results are presented for horns suitable for array feed or directly radiating array applications that show an aperture efficiency greater than 90% can be achieved over a 5% bandwidth with horns of aperture size ranging from 1....

In this paper, the full-wave analysis of direct scattering problem in rectangular waveguide is derived. The numerical calculation results characteristics are presented. To show advantage our proposed model, we compared with three-dimensional simulation software Ansys HFSS calculations. An excellent agreement observed when these two approaches.

A modal analysis of transverse electromagnetic (TEM) mode in a circular–rectangular coaxial waveguide is presented in this paper. The analysis is based on the modal-expansion technique. Analytic expressions for the characteristic impedance and attenuation coefficient are derived from the solution of the TEM mode. The calculated results are compared with those of the finite-element method, as we...

The rectangular dielectric waveguide (RDWG) technique has been previously described for the determination of complex permittivity of a wide class of dielectric materials of various thicknesses and cross sections. This paper presents a unified RDWG technique for the determination of the dielectric constant of materials. Some measurement results are reported in the W -band frequencies to demonstr...

Abstract—A direct 61GHz demodulator, based on a rectangular waveguide (WR-12) six-port, is presented in this letter. The six-port device, composed of four 90◦ hybrid couplers fabricated in a metal block of brass, is implemented in ADS software. Good agreement between QPSK demodulation results using an ideal six-port model and a second one, based on the S-parameter measurements of a 61GHz hybrid...

A novel compact dual-band bandpass waveguide filter is presented in this paper. H-plane metal inserts with complementary split-ring resonators are implemented as resonating elements in the standard (WR-90) rectangular waveguide. Design starts from the models of the waveguide resonators with two resonant frequencies (9 GHz and 11 GHz) using a single flat or folded metal insert. Further, folded i...

A rapidly converging moment solution for the complete analysis of homogeneous dielectric posts of the inductive type in rectangular waveguide is presented. The moment method approach uses filamentary currents to simulate both the field scattered by the post and the field inside the post and in turn point-matches the continuity conditions for the tangential components of the electric and magneti...