Reg Edwards wrote:
Roy. as you know, radio propagation through the ground follows exactly the same laws as propagation through anything else. Sure. The only real differences among salt water, dirt, and air are the loss -- which is a big difference -- and propagation velocity. All is governed by the resistivity, permeability and permittivity of the medium, at a partcular frequency, and the geometry of the interfaces between different mediums. The problem of finding solutions to paricular problems lies only in entering input data into a general purpose, number crunching computer program, which I'm sure versions of it already exist. NEC-4 can handle antennas and propagation in two media of infinite extent separated by an infinite plane boundary. Neither one has to be air. While this doesn't imitate some real situations very well, it can produce some good insights into propagation and the performance of antennas embedded in a medium other than air. Roy Lewallen, W7EL |
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