John Harmonic Posted September 25, 2018 Share Posted September 25, 2018 At what frequency does Alternating Current start to emit electromagnetic radiation? Link to comment Share on other sites More sharing options...
swansont Posted September 26, 2018 Share Posted September 26, 2018 Anything above zero. But since the principle radiation frequency will be at the AC frequency, there are practical limitations, since the wavelength is related to the frequency, and the efficiency of power radiated depends on the antenna. Link to comment Share on other sites More sharing options...
John Harmonic Posted September 26, 2018 Author Share Posted September 26, 2018 11 hours ago, swansont said: Anything above zero. But since the principle radiation frequency will be at the AC frequency, there are practical limitations, since the wavelength is related to the frequency, and the efficiency of power radiated depends on the antenna. Can transmission lines act as an antenna for AC? Link to comment Share on other sites More sharing options...
Strange Posted September 26, 2018 Share Posted September 26, 2018 35 minutes ago, John Harmonic said: Can transmission lines act as an antenna for AC? Yes. You can run a loop of wire underneath and extract power from it (don’t do this, it is illegal). Or hold a fluorescent tube under it 1 Link to comment Share on other sites More sharing options...
swansont Posted September 26, 2018 Share Posted September 26, 2018 1 hour ago, John Harmonic said: Can transmission lines act as an antenna for AC? As Strange has noted, yes. This is why you tend to use wires twisted around each other for AC signals. In the far field you don't see a net current flow. The radiation intensity drops off more rapidly than if you had a single conductor. Link to comment Share on other sites More sharing options...
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