RF transmitter inside a metal enclosure, re. reflections

[sophiecentaur]

don't expect to find much that's actually new.

but, if you do make the most of already available knowledge, you will find loads to interest and satisfy you. Even Newton acknowledged the idea of standing on the shoulders of giants.

 

[cmb]

Summary:: on an receiving antenna, that a 1W RF transmitter source might induce 1mW. But inside a RF reflective (metal) enclosure, this same scenario might induce more than the 1mW on a receiving antenna because of the duplication of apparent radiation sources of the reflections? maybe it might induce near 1W?

wavelength is .3 m to 6m, a 3m waveguide can do up to the 6m λ, so it will reflect all the frequencies concerned

The output will never exceed the input.

If there is a transmitter and receiver that receives , as it were, 'repeated' transmissions, then the impedance will decrease, like having multiple resistors receiving a current. Therefore, the effect of the box is that it can act as an impedance matching feature.

However, the output can be substantially less than the input, thus can act as an attenuator.

Those two things, each acting in their own way, will lead to you having made a band pass filter.

As if by magic, youtube provides the direct demonstration;-



HTH

 

[nsaspook]

but, if you do make the most of already available knowledge, you will find loads to interest and satisfy you. Even Newton acknowledged the idea of standing on the shoulders of giants.

This poster has been on several sites and we have already been in several conversations about his various, somewhat esoteric questions similar to this one.