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Reactance is the imaginary part of impedance. Together with the real part, resistance, impedance describes how a given load will respond to an AC voltage or current source. While for DC analysis resistance alone is sufficient for this purpose, for AC analysis we need to know not only the magnitude of the voltage or current, but the phase angle between them, ...


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I don't think the "matching to free space" should be taken so literally. I've never seen an actual equivalent circuit in a textbook or used it to derive any property of an antenna. Sure an antenna is the interface between the transmission line (which has an impedance) and free space (which also has an impedance, same units but different in nature). ...


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Let's assume the answer to your question is yes: an antenna can be mismatched to free space. What would that look like? Well, the feedline, let's say it's 50 ohms, is matched to the antenna's feedline port, so no reflection there. But at the mismatch to free space there'd be a mismatch, generating some reflection. Is this any different than the antenna being ...


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