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Broadband waveguide matched loads based on microwave photonic crystals

Keywords:

D.A. Usanov – Dr. Sc. (Phys.-Math.), Professor, Head of Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky E-mail: usanovda@info.sgu.ru V.P. Meschanov – Dr. Sc. (Eng.), Professor, Director of NIKA-Microwave, Ltd (Saratov) E-mail: nika373@bk.ru A.V. Skripal – Dr. Sc. (Phys.-Math.), Professor, Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky E-mail: skripala_v@info.sgu.ru N.F. Popova – Ph. D. (Eng.), Senior Research Scientist, Deputy Director , NIKA-Microwave, Ltd (Saratov) E-mail: nika373@bk.ru D.V. Ponomarev – Ph. D. (Phys.-Math.), Associate Professor, Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky E-mail: ponomarev87@mail.ru


The results of theoretical and experimental justification of the possibility to use microwave photonic crystals to create microwave broadband matched loads are presented. The waveguide photonic crystal is designed as a one side short-circuited rectangular waveguide section with the structure of alternating metal and dielectric layers with different values dielectric permittivity of thickness and dielectric constant. The wave transfer matrix between regions with different values of the electromagnetic wave propagation constant has been used to calculate the electromagnetic wave reflection coefficients at normal incidence on layered metal-dielectric structure. Computer simulation has been demonstrated the possibility to create waveguide matched loads in the centimeter and millimeter wavelengths. The number and sequence of layers, their thickness, dielectric constant, and conductivity have been determined by solving the optimization problem in the way to obtain the magnitude of reflection coefficients less than predetermined values. The results of calculation of reflection coefficient and voltage standing wave ratio VSWR in the frequency ranges 8,15…12,05 GHz and 25,95–37,50 GHz at wave normal incidence on metal-dielectric multilayer structure completely filling the waveguide cross-section have been presented. According to the numerical results broadband waveguide matched loads based on multilayer dielectric structures and providing voltage standing wave ratio of less than 1,10 in the frequency range 8,15…12,05 GHz and less than 1,15 in the frequency range 25,95…37,50 GHz have been made.
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