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Yes I should know this.. However an issue has come up in my place of
work I am trying to get my head around. On a 10GHz microwave TX there is a stripline parallel to the output track that is suppose to detect forward power. Nothing strange about that. What is weird is that it appears to be roughly a half wave length (or more). The question is this. If one hangs a 1/2 wave dipole in free space I assume it receives such that current maximums are at the centre and voltage maxiums at the ends. Is this the case whether a feedline is connected or not? If I then take a stripline cct terminated at one end with a 50r resistor and a detect diode at the other and is a half wave long, what is the current/voltage distribution in this configuration. What I wonder is if it is a halfwave there may be no voltage at the detect diode input. (It could be 3/4 wavelength when one factors in pcb dielectric and end loading) Thoughts? Cheers Bob VK2YQA |
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