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Waveguide Sections (waveguide + section)

Distribution by Scientific Domains
Engineering80%

Selected Abstracts

Hybrid mode matching and auxiliary sources technique for horn antenna analysis

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2007
S. G. Diamantis
Abstract A hybrid technique for the analysis of horn antennas is described based on a rigorous description of the horn aperture-free space discontinuity. The transition from the feeding waveguide to the radiating aperture is analyzed by using the mode matching technique (MMT) employing a stepped-waveguide approach. The discontinuity between the horn aperture and the free space is modeled by combining the method of auxiliary sources with the MMT for the stepped waveguide section. Results for the input standing wave ratio are given and compared with the available measurements, which demonstrate the very good performance of the method. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 734,739, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22233 [source]

CAD of evanescent-mode bandpass filters based on the short ridged waveguide sections

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 6 2001
Anatoly Kirilenko
Abstract The paper presents the internal details of a developed full-wave algorithm for the computer-aided design of evanescent-mode bandpass filters formed by single- or double-short ridged waveguide sections. New filter configurations with an enlarged cross section of filter housing and nonconventional notch-strip-notch elements providing improved stopband performance are given special considerations. Additional input,output transformers built on rectangular waveguide sections are used in designing broadband filters. Characteristics of one of the designed filters are verified by measured data. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 354,365, 2001 [source]

Dispersive properties of photonic crystal waveguide resonators

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 11 2007
T. Sünner
Abstract We have investigated the group delay and the dispersion of light propagating through photonic crystal (PhC) resonators defined in 240 nm thick GaAs membranes. The design of the resonators is based on a PhC heterostructure, which combines waveguide sections with different lattice constants along a PhC waveguide. The measurements were performed by detecting the phase shift of a microwave signal which was modulated onto the light of a tunable laser source. The group delay was found to increase linearly with the quality factor of the resonator, in good agreement with the prediction of a model where the PhC resonator is replaced by an equivalent Fabry,Perot resonator. An alternative analysis of the measurements was performed using a Hilbert transform approach. A maximum group delay of 132 ps was observed for a resonator with a quality factor of 82000. The overall length of this resonator was 10.4 ,m, resulting in a propagation speed of 7.88 × 104 m/s (c/3800). The maximum dispersion of the resonator was around 1.7 ns/nm, which is equivalent to 100 km of standard optical fiber. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]