Full-wave design of H-plane contiguous manifold output multiplexers using the fictitious reactive load concept

In this paper, a new procedure for the design of contiguous band manifold output multiplexers in H-plane configuration is presented. Such a configuration eliminates the slots between the T-junctions and the filters allowing high power handling, as well as dramatically reducing the risk of multipactor. This paper pursues the division of the design into tasks with low computational effort. The approach comprises: 1) the singly terminated synthesis of the channel filters and their corresponding full-wave responses; 2) the manifold design using fictitious reactive loads simulating the phase response of every channel out of its corresponding band; and 3) the final full-wave optimization of the whole structure using the simulated-annealing method. In order to validate the above procedure, a five-channel Ku-band multiplexer has been designed, manufactured, and measured.

[1]  William H. Press,et al.  Numerical Recipes in FORTRAN - The Art of Scientific Computing, 2nd Edition , 1987 .

[2]  Wai-Cheung Tang,et al.  Innovations in microwave filters and multiplexing networks for communications satellite systems , 1992 .

[3]  William H. Press,et al.  Numerical Recipes: FORTRAN , 1988 .

[4]  E. M. Jones,et al.  Microwave Filters, Impedance-Matching Networks, and Coupling Structures , 1980 .

[5]  Marco Guglielmi,et al.  Simple CAD procedure for microwave filters and multiplexers , 1994 .

[6]  Francois T. Assal,et al.  A contiguous band multiplexer , 1976 .

[7]  R. Levy,et al.  Design of General Manifold Multiplexers , 1979 .

[8]  M. K. Chahine,et al.  Optimal design of contiguous band multiplexers , 1994 .

[9]  Kawthar A. Zaki,et al.  Millimeter-wave Ka-band H-plane diplexers and multiplexers , 1999 .

[10]  E. G. Cristal,et al.  Theory and Design of Diplexers and Multiplexers , 1967 .

[11]  R. Levy,et al.  A Generalized Multiplexer Theory , 1979 .

[12]  A. E. Atia.  Computer-Aided Design of a Waveguide Multiplexer , 1973 .

[13]  A. E. Atia.  Computer-Aided Design of Waveguide Multiplexer (Short Papers) , 1974 .

[14]  Mauro Mongiardo,et al.  Efficient CAD of wideband contiguous channel multiplexers , 1996, 1996 IEEE MTT-S International Microwave Symposium Digest.

[15]  D. Wolk,et al.  A 450-W Output Multiplexer for Direct Broadcasting Satellites , 1982 .

[16]  A.E. Atia,et al.  A Contiguous-Band Multiplexer Design , 1983, 1983 IEEE MTT-S International Microwave Symposium Digest.

[17]  L. Accatino,et al.  Hybrid circuit-full-wave computer-aided design of a manifold multiplexers without tuning elements , 2002 .

[18]  15 channel contiguous Ku-band high power output multiplexer , 1994 .

[19]  D. Rosowsky,et al.  The 14 channel C-band output multiplexer assembly for Intelsat 805/806 , 1996 .