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Quasi-Optical Optimization and Modal Analysis of Cornercube Schottky-Diode Mixers

Authors:
J. Brune, P. Bierschneider
Abstract:
An optimization of the system cornercube mixer - Gaussian beam requires a calculation of the power coupling coefficient. First, the cornercube field is determined by the use of image theory. Then the field of a Gaussian beam is transformed into the cornercube coordinate system. The transformation used here allows both: a tilt of the mixer relative to the beam and also longitudinal and lateral shifts. Now the evaluation of the coupling integral wi1l be performed numerically. The optimization of the beam parameters for the standard cornercube mixer (L = 4[lambda]. s = 1.2[lambda]) and for a commercially available mixer (L = 4[lambda], s = 0.93[lambda]) resulted in maximum power coupling coefficients of 59 % and 77 % respectively. If the antenna dimensions are also involved in the optimization process a coupling of 88 % can be reached for an antenna configuration with L 0.92[lambda] and s = 0.83[lambda]. Finally the frequency response is shown and a modal analysis is performed for all three mixer types. It can be concluded that the standard configuration used in many quasi-optical systems all over the world is far away from the optimum.
Categories:
Components, Quasi Optics
Year:
1994
Session:
10
Full-text:
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Page Number(s):
682-697