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# Analysis and Design of Cruciform Waveguide Junction with a Conducting Diaphragm and a Dielectric Layer in the Main Arm

Telecommunications Department, Georgian Technical University, 0175, Tbilisi, Georgia; D. Guramishvili International University Iberia, 0177, Tbilisi, Georgia; Institute of Radio Astronomy, National Academy of Sciences of Ukraine; Krasnoznamennaya Str, 61002, Kharkiv, Ukraine

Progress In Electromagnetics Research B 01/2011; 29:139-155. - Citations (26)
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**ABSTRACT:**A rigorous design theory for compact rectangrdar waveguide power dividers with unsymmetrical series E-plane T-junctions of suitably optimized different waveguide heights and distances is described. The method is based on field expansion in normalized eigenmodes which yield directly the modal S-matrix of two appropriate key building blocks. The immediate modal S-matrix combination of the individual structures includes the effects of all step discontinuities and their mutual higher order mode interaction. Computer-optimized -3.01 dB, -4.77 dB, and -6.02 dB power divider examples achieve about +-0.25 dB coupling deviation at the output ports, together with about 30 dB return loss at the input port, for the chosen design frequencies of 12 GHz, 31.6 GHz, and 15.5 GHz. The -4.77 dB power divider provides a bandwidth of about 8 percent. The theory is verified by measurements.IEEE Transactions on Microwave Theory and Techniques 12/1987; · 2.23 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**A computational scheme is proposed that can be applied to the analysis of cascaded waveguide discontinuities of alternating boundary-enlargement and boundary-reduction type. Based on the mode-matching technique, the proposed procedure makes use of the admittance matrix characterization of waveguide stubs. With respect to the conventional S -matrix formulation, it leads to a notable reduction of the computational effort, particularly for lossless structures. At the same time, the criterion for avoiding relative convergence problems can be satisfied. The procedure has been used to set up a very accurate and efficiency computer-aided design tool of branch guide couplers (BGCs). These are key elements of beam-forming networks for multicontoured beam satellite antennas and have to be designed with very high accuracy so as to eliminate the necessity for tuning the components realized. Design accuracies better than 0.1 dB in Ka -band are demonstrated by experimental resultsIEEE Transactions on Microwave Theory and Techniques 03/1988; · 2.23 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Abstract—An improved E-plane power divider for compact waveg- uide triplexers with large separation between channels is presented. The configuration of the divider aims to exploit the different behavior of the device for frequency bands with large separation, leading to a very asymmetric E-plane junction. H -plane filters with inductive win- dows are used for each channel, in order to obtain reduced insertion losses and lower sensitivity than in metal-insert E-plane filters. The resultant triplexer configuration is very compact, and its design is an- alyzed and optimized by Mode-Matching. The experimental results of a full Ku-band prototype for communications satellite systems show a very good agreement with the expected simulated response.Progress in Electromagnetics Research-pier - PROG ELECTROMAGN RES. 01/2008;

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