90 degree hybrid
90 degree hybrid
(OP)
How does a 90 degree hybrid work?
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RE: 90 degree hybrid
Buding
RE: 90 degree hybrid
RE: 90 degree hybrid
At higher frequencies where the wavelength is suitably small the 90 degrees shift can be achieved by a length of transmission line.
At lower frequencies where the parasitics of components do not have such an effect you can acieve a 90 degree difference in the two outputs using inductors and capacitors. For example a series inductor and shunt capacitor in one arm with a shunt inductor and series capacitor in the other.
I generally find that at frequencies over 2GHz standard surface mount components (0402) are starting to cause problems in hybrids mainly due to the tollerances.
David.
RE: 90 degree hybrid
another important thing is isolations between output signals ( in microwave band better than 20dB )