Dear All;
I m not expert in microwave or magnetic field phenomenon then maybe my question is basically wrong. I hope you can correct me.
In the below photo, you can see "microwave coaxial reactor". There is a copper antenna to waveguide supplying the power to the discharge chamber. But question is how copper ( permeability =1, means non-magnetic) can guide wave?
Many references are considered copper Antenna as perfect magnetic conductor. But how?
Thanks.
Copper guides the wave because it is an electrical conductor, not because it is a magnetic conductor (it isn't a magnetic conductor). Electric currents flow on the wires, mainly along the wires, and these currents generate magnetic fields around the wires and in the cavity. There will be a complicated arrangement of electric and magnetic fields in the cavity.
At microwave frequencies wires are often a significant part of a wavelength long so can look like capacitors or inductors by themselves. Also, the capacitance or inductance normally calculated is more significant, because it is multiplied by the frequency to get the impedance, and the frequency is very high. For this reason, and others, microwave circuits often do not look like "normal" electrical circuits.
It isn't just microwaves you don't understand. Even at DC or low frequencies, copper is not a magnetic conductor, it is an electrical conductor. You need to read some basic books or courses on electromagnetism to improve your understanding.
Dear Malcolm White
Many thanks for your explanation. I got the point.
The magnetic and electric waves are far from my background, as you pointed, I have to learn basically.
Regards
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