H-Plane Field Intensity vs. Distance from Monopole Transmit Antenna

Thread Starter

Broadcast Engr retired

Joined Dec 25, 2017
4
In a closed thread of this forum, on Dec 10, 2017 "pratto" was interested in an answer to this topic for a 50 kW transmitter.

At a distance of 1 km, the surface-wave field intensity at a horizontal distance of 1 km from a λ/4 vertical monopole antenna system such as used by typical AM broadcast stations is about 2 volts/meter.

If all of that field was collected by a receive antenna, the received power would be about 53 milliwatts -- which is about 17.2 dB greater than 1 mW.
 

Thread Starter

Broadcast Engr retired

Joined Dec 25, 2017
4
Don't you mean "E-Plane Field"?
I was referring to the electric field component of an e-m wave.

In the case of my example in the OP, the physical orientation of the E-field vector is perpendicular to the earth, i.e., it is vertically polarized. The example considered that e-m field as it propagated from the radiator along the horizontal plane.
 

SLK001

Joined Nov 29, 2011
1,548
I was referring to the electric field component of an e-m wave.

In the case of my example in the OP, the physical orientation of the E-field vector is perpendicular to the earth, i.e., it is vertically polarized. The example considered that e-m field as it propagated from the radiator along the horizontal plane.
I meant in your title.
 
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