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Anyone know how can i design antenna for electric field detection. i m trying to make contactless Ac mains Detector which range is near about 1-mtr long.
my question is about possibility of antenna construction for electric field sensor. but as i calculate the wavelength (for 50hz) is around 6*10^6km its mean the antenna height (lambda/4) is equal to 1500km long. so this is very difficult to construct. i need some pcb mounted antenna for that. is anyone have an idea please help me out.

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  • $\begingroup$ If your calculations are causing errors, you could show them here and we can look at that. $\endgroup$
    – joseph h
    Dec 21, 2020 at 7:29
  • $\begingroup$ no sir i m not doing any calculation till now. bcoz i have no idea how to start from beginning. i have an idea only about calculation of microstrip patch antenna @Dr jh $\endgroup$
    – Er.rht
    Dec 22, 2020 at 10:32
  • $\begingroup$ If you are doing a calculation (as in your question you stated but as i calculate the wavelength (for 50hz) is around 6*10^6km its mean the antenna height (lambda/4) is equal to 1500km long) ....a six billion meter wavelength seems a bit off don’t you think? $\endgroup$
    – joseph h
    Dec 22, 2020 at 22:55
  • $\begingroup$ just can tell me how do i start for calculation $\endgroup$
    – Er.rht
    Dec 23, 2020 at 4:10
  • $\begingroup$ which type of antenna is best for this application $\endgroup$
    – Er.rht
    Dec 23, 2020 at 4:11

1 Answer 1

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this can be easily done by making your "antenna" in the form of a loop consisting of many turns of wire, surrounding the AC mains line. This coil then becomes the secondary winding of a transformer in which the AC mains line is the primary. For this to work, only the HOT line of the two-wire AC mains should go through the loop- NOT both of the lines, and a load (like a small heater, etc.) must be connected to the AC mains, so that current will be flowing.

You can buy a tool called a clip-on ammeter probe which is a miniature version of what I have just described. You then connect the output plug of the clip-on probe to the input of an oscilloscope, on which you can monitor the mains signal.

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  • $\begingroup$ thank you sir @niels nielsen $\endgroup$
    – Er.rht
    Dec 23, 2020 at 4:08

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