Title :
Analysis of a multiple-beam waveguide for free-space transmission of microwaves
Author :
Empacher, Lars ; Kasparek, Walter
Author_Institution :
Inst. fur Plasmaforschung, Stuttgart Univ., Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
The transmission of several quasi-optical beams via one system of oversized focusing mirrors is discussed. The analysis of this multiple-beam waveguide shows that such a system can substantially reduce the total mirror surface compared to the corresponding number of individual lines. With the help of analytic coupling coefficients for Gaussian beam modes deduced from the coupling integrals, configurations of four mirrors are found, which give low losses due to the reconversion of spurious modes generated at the different mirrors. Optimization of the mirror surfaces as a function of system parameters is performed and expressions for the loss as a function of the number of transmission channels are deduced. The results are confirmed by diffraction calculations and laboratory scale experiments. The application to a high-power system promises a very efficient transmission with high mode purity
Keywords :
Gaussian processes; coupled mode analysis; electromagnetic wave transmission; microwave propagation; mirrors; waveguide components; waveguide theory; Gaussian beam modes; coupling coefficients; coupling integrals; diffraction calculations; free-space transmission; high-power system; multiple-beam waveguide; oversized focusing mirrors; quasi-optical beams; reconversion; spurious modes; Electromagnetic heating; Focusing; Millimeter wave technology; Mirrors; Optical coupling; Optical surface waves; Optical waveguide theory; Optical waveguides; Plasma waves; Propagation losses;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
