To assess the performance of orthomode transducers (OMTs), the back-to-back (BTB) configuration is analyzed in simple fundamentals for accurate results and clear physical insight. The axial rotation of an OMT in the BTB measurement setup is investigated, and clear facts are highlighted. Furthermore, terminating OMTâ\euro™s Common Port with a short circuit load is proposed as a low-cost and accurate evaluation technique based on detailed analysis. The presented techniques have the advantage of using only power measurements without anechoic chambers. A full-wave simulation of a published OMT operating at V-band (55 - 65) GHz is used to validate these analyses.

A simple and a straightforward mathematical modeling of the eddy current generated on a retarded rotating disk (RD) is proposed in this paper. First, the braking magnetic force, which curbs the movement of the disk is evaluated using the basic laws of electromagnetism. Second, the braking torque is related to the braking force through a polynomial function. Third, the equation of motion is derived considering the nonlinear behavior of the aerodynamic drag forces. The proposed model is validated experimentally for constant and alternating magnetic flux profiles with best fit rates (BFRs) more than 85% and 93% for both rotational velocity and braking torque, respectively. Programmable braking application is demonstrated using the proposed approach and its applicability is verified experimentally