It's not appropriate to use a very thick coax line to feed an antenna with compact size. When it comes to the physical size of the coax line, basically, it largely depends on the size of your antenna. On the tutorial for the lumped port domains, he chooses the microstrip line edge which is to be excited, i have done this but when i compute the study i receive the following messageĮrror in automatic sequence lumped port. how do i choose an appropriate minimum element? Previously i never had to specify a minimum element, i thought it would just do this for me. i dont know if this is right because i aint got a clue where the ground is on the turoial one given as the patch is inside the substrate.Įdge is much shorter than the specified minimum element size.įace is (or has a narrow region that is) much smaller than the specified minimum element size. One for the microstrip line edges, or at least that's what the turorial seemed to do so i selected my edges too and one cover the ground, substrate and patch. The tutorial used a free tetrahedral mesh and creates a further 2 sizes.
I have one mesh covering the inner sphere (i think this is a gaussian surface or something to calculate electric fields but it doesn't say. The design is really simple, i have attached it at the bottom if anyone wants to take a look.
My end goal is to find the S parameters and impedance so i can design a quarter wave transformer to go on the end to match the antenna.
I tried to transfer the same procedures over to my design, a circular polarised microstrip antenna but i am having a few problems. I must have done this ten times now and it works fine. I followed the tutorial for the inset microstrip antenna provided. I am completely new to COMSOL and i am struggling with a few basic things for my uni project.
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