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Posted May 23, 2018, 9:17 AM EDT RF & Microwave Engineering, Wave Optics Version 5.3a 3 Replies
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Hi, I am struggling to simulate a plane wave propogating in air. It should be very straightforward, but I am unable to get satisfactory results in COMSOL 5.3a.
Basically, I use a rectangular 2-D model with the RF module (electromagnetic waves, frequency domain). The wave propogates in the X direction, and I specify two user-defined ports at the vertical edges of the rectangle (x=0; wave excitation) and (x=L; no wave excitation) of the rectangle. I specify the input quantity as electric field, with the electric mode being Ex,Ey = 0 and Ez = 1. The propogation constant (beta) is set to emw.k. Along the 2 horizontal edges, I set the boundary conditions as perfect electric conductors. I don't know if using a perfect electric conductor is an appropriate boundary condition.
When I compute, the electric field in the z direction (Ez) doesn't oscillate around 0 and in fact goes to 0 almost immediately.