- #1
geoduck
- 258
- 2
Why is so much emphasis placed on matching the impedance of a feed line with an antenna?
Shouldn't the emphasis be placed on matching the internal generator impedance AND feed line with the antenna instead?
That is, you take the impedance of the source, transform it using the transmission line equation to get the source impedance as it appears at the terminals of the antenna, and only then do you try to match impedances, except this time it's trying to match the impedance of the source (as seen at the terminals of the antenna) with the impedance of the antenna?
Also, it seems that impedance matching amounts only to cancelling the reactive part of the antenna. You can't add a resistor to the real part of the antenna to help you match the real part of an impedance, because then the extra power you get is going to be used up in the resistor you added and not the antenna, so what's the point? Whereas if you add a reactive part to your antenna, no power is used in the reactive part, so it makes sense to add reactive parts to increase the power, but not resistors. Is this right?
Shouldn't the emphasis be placed on matching the internal generator impedance AND feed line with the antenna instead?
That is, you take the impedance of the source, transform it using the transmission line equation to get the source impedance as it appears at the terminals of the antenna, and only then do you try to match impedances, except this time it's trying to match the impedance of the source (as seen at the terminals of the antenna) with the impedance of the antenna?
Also, it seems that impedance matching amounts only to cancelling the reactive part of the antenna. You can't add a resistor to the real part of the antenna to help you match the real part of an impedance, because then the extra power you get is going to be used up in the resistor you added and not the antenna, so what's the point? Whereas if you add a reactive part to your antenna, no power is used in the reactive part, so it makes sense to add reactive parts to increase the power, but not resistors. Is this right?