THz Antenna

Hi, I am trying to simulate a planar antenna placed on high permittivity substrate, this structure is on turn place on an electrically large Silicon lens. This problem would be computationally demanding to solve with the traditional FEM+Radiation-Box method, and I was wondering if there is a correct alternative way to simulate this structure, I had a look at various methods based on IE (For example by using one of the Integral-equation or methods or by appropriately defining some hybrid FE-BI regions, etc.), but those are usually employed for electrically large conducting objects and not for dielectric ones as in my case.

Hopefully, you could suggest me a proper way to simulate this structure.  

Thank you.

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