Condition for duct propagation is _________(a) \(\frac{dμ}{dh}\)is -ve(b) \(\frac{dμ}{dh}\)is +ve(c) \(\frac{dμ}{dh}\)is zero(d) \(\frac{dμ}{dh}\)is unityI got this question in an interview for job.My question is based upon Space Wave Propagation topic in section Space Wave Propagation of Antennas

Condition for duct propagation is _________(a) \(\frac{dμ}{dh}\)is -v

1.	Condition for duct propagation is _________(a) \(\frac{dμ}{dh}\)is -ve(b) \(\frac{dμ}{dh}\)is +ve(c) \(\frac{dμ}{dh}\)is zero(d) \(\frac{dμ}{dh}\)is unityI got this question in an interview for job.My question is based upon Space Wave Propagation topic in section Space Wave Propagation of Antennas
Answer» Right OPTION is (a) \(\FRAC{dμ}{dh}\)is -ve Best EXPLANATION: The height v/s the refractive index graph of duct propagation is as follows To determine the presence of duct propagation (T.I.L) and \(\frac{dμ}{dh}\)is -ve.

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