Electronics

Electronics

How to simulate a large dielectric lens in mmWave

    • amhegazy
      Subscriber

      Hello, 


      I'm trying to simulate a dielectric lens with a radius of around 30mm at 77GHz band, i'm using HFSS full wave simulator with a radiation box to get the farfield pattern. This simulation takes too much time and computing resources. Is there a more efficient hfss solver like SBR+ that can help make the simulation faster and less resource consuming?


      Note:I tried using SBR+ but it says that the lens structure should be a conductor not dielectric.


      Here is a picture for the structure:

    • AndyJP
      Subscriber

      " This simulation takes too much time and computing resources" how much? More than 15 minutes for central (meshing) frequecy? Incorrect setup. Or there are some advanced microcomponents on the board which we do not see on the screenshot. Try simulating it in uniform box of lens dielectric around the board, instead of air to see how much resources your antenna takes.

    • amhegazy
      Subscriber

      It takes around 4 hours to finish. Its a very simple 3 element series fed antenna and it doesn't take too much time alone(few minutes).

    • AndyJP
      Subscriber

      if a dielectric is configured wrongly, it will force excessive
      meshing not only inside, but around the object. you can save time and
      RAM considerably by using flat striplines with layered impedance.
      Boolean-unite contacting and overlapping objects of the same material.
      Do not let pointless gaps between objects.

      One small object, like a gap between surfaces can force excessive meshing around, which kills the performance.

       

      That
      is in the case when your PC is working smoothly. I have interesting
      experiences, which I would separate into 2 cases: 1)failing CPU cooler
      results in degraded performance and stalls due to CPU throttling and
      protective sleep. Same happens with laptops. Try not using laptops in
      simulation. Even branded laptop workstations are not for simulation! 2)
      Failing ECC memory may not fail owing to ECC corrections, but may reduce
      performance significantly. It starts failing when simulating with large
      amounts of RAM frequently accessed. Check IPMI/BIOS logs. Use memory
      stress tests like TestMem5.

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