6.8. Radiation ResistanceΒΆ
The radiation resistance of the magnetic-cored loop is obtained by multiplying radiation resistance of the air-cored loop and relative effective permeability of magnetic core [8][50].
- \(R_{rad}^{air}\) : Radiation resistance of the air-cored loop
- \(\mu_{cer}\) : Relative effective magnetic permeability of the core
So, radiation resistance of the N-turn, magnetic-cored loop is given by
- \(C\) : Circumference of the loop [m]
- \(A\) : Area of the loop [m]
- \(\lambda\) : Wavelength [m]
- \(N\) : Number of turns of the loop
In order to determine the radiation resistance of a ferrite core, it is necessary to find the relative effective magnetic permeability of the ferrite core ( \(\mu_{cer}\)). Other variables are known geometrical and electrical properties.