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1.) This distance makes a large difference in helical antenna performance. googling found me answers. look up stub-matched helicals
2.) As long as its larger than skin depth at the lowest frequency youre ok
3.) dimensions for the coax feeder? again google is ur best answer, and yes this makes...
Im using the (ES) Electrostatic Solver to compute the E&H-Fields from an Electric Potential using a Hexahedral mesh. This works fine. From there when I click Post Processing -> Thermal Losses I'm getting the error:
*Unable to compute a thermal volume loss distribution for electric losses...
Could be a number of problems. Looks like you just have a helix curve that isnt a conductive material. I bet the square is radiating as a patch antenna. Do this to fix:
1. Check to make sure your units and scale is all correct.
2. Create a circle curve at the end of your helix and loft it...
The difference is in how you set up and define the port. S11 is a measurement of how much energy is reflected back. So in one sim, you have a good impedance match at the port, and in the other you don't. Check your port definitions to make sure the impedances are the same, say 50ohm or...
Background material should not be PEC. Use normal material with mu and epsilon of 1 for the background material. This should be the default. Make sure your coax feed actually has a dielectric section of material to it. It looks like your dielectric portion of the port is modeled as PEC...
My guess is that you didnt fabricate the antenna the same way you simulated it. You are most likely measuring the VSWR from your SMA or N connector to the dipole. When you cut a hole in the ground plane, it's important that you fill it with a dielectric, or size the hole to account for air as...
This is the most frequent error i get too. Go to Mesh->Mesh Properties and increase the mesh line ratio limit, as well as raise the lines per wavelength.
This should help.
Im running at 26 lines/wavelength and 7 mesh line ratio
to design helical antenna
Use Kraus's book, and CST Microwave studio. Not knowing anything about helicals, I had one designed, built in CST, and simulated in a single day. CST is amazingly simple to use. Ive tried WIPL-D, HFSS, and COMSOL. CST ftw. Also the spacing between the reflector...
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