HOHOH
Member level 5
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FANT said:I have opened once the directional bridge from our HP8753 network analyzer, frequency range from 300 KHz to 3 GHz.
It is very complicated and seems that the tuning is hand made .
If you need a picture I will open it again.
If you need a coupler with coupled lines the best is the old HP 778 D ( 100 MHz to 2 GHz ).
Going to a lower frequency the phisical dimension of the coupler is becoming larger and so the losses.
Better is something like a bridge, but the attenuation is fixed.
Mandi
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