Antenna loss resistance
时间：04-11
整理：3721RD
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Hello everybody!
Here is a new topic about antenna. The input resistance of an antenna is divided into a radiating part and losses. Furthermore, the losses are composed of a dielectric part and a skin effect part. I found in the literature that the skin effect losses can be modeled using a so called HF resistance whose value is:
Rhf ≈ 1/(σ δ conductor_perimeter)
where σ is the conductivity of the material and δ the skin depth.
But for the dielectric loss, which is probably related to the tanδ of the material, i found no approximate formula. Does anybody know something about this subject?
BR,
JPC
Here is a new topic about antenna. The input resistance of an antenna is divided into a radiating part and losses. Furthermore, the losses are composed of a dielectric part and a skin effect part. I found in the literature that the skin effect losses can be modeled using a so called HF resistance whose value is:
Rhf ≈ 1/(σ δ conductor_perimeter)
where σ is the conductivity of the material and δ the skin depth.
But for the dielectric loss, which is probably related to the tanδ of the material, i found no approximate formula. Does anybody know something about this subject?
BR,
JPC
I know that the dielectric loss will be
Pld=ω×ε×tanδ×∫|E|**2 dv
perhaps you should first know the EM field distribution,and then with a integeration
you can get the dielectric loss power.[/tex][/list][/quote][/i]
http://www.w8ji.com/radiation_resistance.htm