I have read in my book under communication systems topic that the minimum length of antenna required for communication is wavelength/4 without any explanation. What is the reason for this? Why is only a quarter of a wavelength chosen? I cannot understand.
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$\begingroup$ It is because of resonance. See Dipole antenna - Vertical (monopole) antennas $\endgroup$– Thomas FritschCommented Oct 19 at 13:51
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$\begingroup$ either you read it wrong or you read a wrong book, any size can be used for communications, see the Hertz dipole; any AM radio operating in the ~200 to 450m wavelength range uses antennas to receive the signal with antennas about 10cm long. $\endgroup$– hyportnexCommented Oct 19 at 17:39
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$\begingroup$ for more detail see my answer to this question physics.stackexchange.com/questions/449947/… $\endgroup$– hyportnexCommented Oct 19 at 17:50
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