tomasz1000
Newbie level 6
When a monopole radiates in a waveguide, it sends energy not only along the waveguide. Can I count on about 25% of energy propagating along the waveguide?
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When a monopole radiates in a waveguide, it sends energy not only along the waveguide. Can I count on about 25% of energy propagating along the waveguide?
Then the waveguide goes in two directions. If you do nothing about that, half the power goes one way and half the power goes the other way, so you will get something like 0.4 of the incident power actually going along the waveguide.
I imagine reflections of waves sent at various angles to the long axis of the waveguide. I wonder how they interfere and therefore if in the far field inside the waveguide there are maxima and minima of intensity of EM radiation. I do not expect the textbook case of two plane waves propagating at an angle θ to the axis of the waveguide.
Impedance matching can minimize reflections, presumed you are working above the wave guide cut-off frequency.
- In the general case, the "monopole" will excite different waveguide modes. It's your job to adjust it's position and length to get the modes you want.
- An industry standard coaxial-to-waveguide transition can be understood as a monpole as well. It's usually placed at a waveguide end, so the wave is only transmitted in one direction.