I.A. Makeev - Student, Moscow Institute of Physics and Technology (State University). E-mail: makeev@phystech.edu C.P. Skobelev - Dr. Sc. (Phys.-Math.), Associate Professor, Leading Research Scientist, PJSC «Radiofizika» (Moscow), Associate Professor, Moscow Institute of Physics and Technology (State University). E-mail: s.p.skobelev@mail.ru

A model of an infinite array of oversized (multimode) parallel-plate waveguides with dielectric loads on the walls at the aperture excited in the first (even) and second (odd) TE modes is considered. The dielectric loads are chosen in the form of longitudinally non-uniform plates of definite thickness at the waveguide aperture providing uniform field distribution in the empty part of the waveguide aperture, and of zero thickness at the bottom end to provide good match to the empty waveguide below the loads. An algorithm of numerical analysis based on the hybrid projection method is developed. The algorithm includs projection matching of the fields on the boundaries of the regions, projection of the Helmholtz equation for the field in the region containing the loads on the transverse functions of the waveguide modes, and application of the one-dimensional method of finite elements in the projection formulation for solving the system of ordinary differential equations obtained as a results of projection. The algorithm has been used for optimization of the parameters of the loads as well as for optimization of the amplitudes of the first and second modes for obtaining sector flat-topped array element pattern close to the ideal one. Array radiation characteristics are obtained also for the case of the array excitation via a known circuit containing power dividers and directional couplers.

 

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