Rigorous Mode-Matching Method of Circular to Off-Center Rectangular Side-Coupled Waveguide Junctions for Filter Applications

Com Dev Ltd., Cambridge
IEEE Transactions on Microwave Theory and Techniques (Impact Factor: 2.23). 12/2007; DOI: 10.1109/TMTT.2007.908662
Source: IEEE Xplore

ABSTRACT An accurate and efficient method for analyzing circular to multiple off-center rectangular side-coupled waveguide T-junctions is developed based on a rigorous mode-matching technique. The method is very general and not limited by symmetry or other dimensional constraints to the junction. A new way to match fields on the curved interface between subregions is described in detail. The computer code developed based on this theory is highly efficient. The numerical results match with the results obtained by other methods including experimental ones. The method is used to design a side-coupled circular waveguide dual-mode filter.

1 Bookmark
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, a full-wave method for the electromagnetic analysis of dielectric-loaded cylindrical and coaxial waveguides and cavities is developed. For this purpose, a new four-port ring network is proposed, and the mode-matching method is applied to calculate the generalized admittance matrix of this new structure. A number of analyses on dielectric-loaded waveguide structures and cavities have been conducted in order to validate and to assess the accuracy of the new approach. The results have been compared with theoretical values, numerical modeling from the literature, and data from commercial electromagnetic simulators. The method has been also applied to the accurate determination of dielectric properties, and we provide an example of these measurements as another way to validate this new method.
    IEEE Transactions on Microwave Theory and Techniques 09/2012; 60(9):2730-2740. · 2.23 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, hybrid models for the design and optimization of large-scale multiplexers are presented. First, analysis based on the low-pass prototype filter circuit model proves that the first cavity of a channel filter next to the manifold is critical in the design of multiplexers. A hybrid model is proposed, combining a circuit model and the electromagnetic (EM) analysis of the coupling junction close to the manifold. The fact that only a single junction requires EM simulation facilitates the introduction of neural networks to multiplexer design for the first time. Another format of the hybrid model is then built by replacing the EM simulation with a neural model for the output coupling to the first resonator. The efficiency of the method is demonstrated using a six-channel multiplexer and a 13-channel multiplexer. Responses predicted by the hybrid models agree well with full EM simulations and measurement results. The proposed hybrid models are proven to be able to provide a high degree of accuracy in both in-band and out-of-band frequency ranges and fast, enabling iterative optimization involving all design parameters for large-scale multiplexers.
    IEEE Transactions on Microwave Theory and Techniques 05/2013; 61(5):1839-1849. · 2.23 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Based on a common-area concept and insertion of an infinitesimal perfect magnetic conductor (PMC) wire, a new mode-matching method for mixed coordinate systems is proposed for the analysis of periodic magnetodielectric, perfect electric conductor, and PMC circular cylinder arrays. Our scattering solutions were computed and they showed favorable agreements with other known results in terms of power scattering coefficients, resonant frequency of nanostructures, and the sum rule of extinction width. The low-frequency solutions of periodic arrays were also formulated and compared with the full-wave counterparts.
    IEEE Transactions on Antennas and Propagation 03/2013; 61(3):1327-1333. · 2.33 Impact Factor

Full-text (3 Sources)

Available from
Oct 12, 2014