Discussion Forum

Greetings all,

I am trying to model the microwave heating of a thin wire antenna structure with thickness on the order of or an order higher (roughly) than the skin depth that is embedded within a dielectric. The electrically conductive antenna features are very small in comparison to the wavelength.

My question is--what would be the most computationally efficient way to introduce a time-steady field into this problem for transient simulation? My initial efforts have used a port of dimensions of WR 340 or WR 284 to propagate a TEM01 mode, either with or without a slit condition. This certainly works if the metal feature is omitted from the simulation, but simulation fails when I insert the feature, presumably because the computational domain has to be enormous compared to the wire feature in order to allow use of a port.

My question is: Would there be a way to establish a time-variant but steady field of spatially uniform field strength everywhere in the simulation to represent the situation I am modeling, which is a free-space traveling wave? If this is possible, I could shrink down the computational domain substantially. I cannot direct simulate the field at nano/pico second timescales--this is unrealistic--as I need to compute to simulation times on the order of ~5 seconds.

Any thoughts on alternative setup to a waveguide port for excitation for this appljication are much appreciated!