09-09-2017, 07:45 AM
Here's an extract from Terman, Radio Engineers Handbook, concerning wave tilt:
"The electric vector of the wave produced at the surface of the earth by a vertical antenna possesses a slight forward tilt. As a result the electric vector has, in addition to the normal vertical component a slight horizontal component parallel to the surface of the earth, and lying in the direction of propagation. ... The component of the electric vector lying parallel to the earth's surface that is present because of wave tilt represents a voltage applied across earth's surface. This voltage causes a current to penetrate down into the earth."
It's explained in more detail in an article by G.W.O. Howe entitled Wireless Waves at The Earth's Surface in Wireless Engineering, Sept. 1940, P385:
http://www.americanradiohistory.com/...er-1940-09.pdf
So far as I can make out there it is, a horizontal component of the transmitted E field lying in the direction of propagation (the same direction as the wire in a Beverage antenna) due to the wave tilt and it's that, that results in the current flowing along the antenna wire.
Lawrence.
"The electric vector of the wave produced at the surface of the earth by a vertical antenna possesses a slight forward tilt. As a result the electric vector has, in addition to the normal vertical component a slight horizontal component parallel to the surface of the earth, and lying in the direction of propagation. ... The component of the electric vector lying parallel to the earth's surface that is present because of wave tilt represents a voltage applied across earth's surface. This voltage causes a current to penetrate down into the earth."
It's explained in more detail in an article by G.W.O. Howe entitled Wireless Waves at The Earth's Surface in Wireless Engineering, Sept. 1940, P385:
http://www.americanradiohistory.com/...er-1940-09.pdf
So far as I can make out there it is, a horizontal component of the transmitted E field lying in the direction of propagation (the same direction as the wire in a Beverage antenna) due to the wave tilt and it's that, that results in the current flowing along the antenna wire.
Lawrence.
