I was searching a lot for understanding what is gain and phase matched cable. Can somebody explain on what is gain and phase matched cable
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\$\begingroup\$ Basically and set of cables that behave more or less the same across some predefined RF band. In the GHz realm, all kinds of mystic voodoo comes in to make seemingly identical components behave quite differently ;) Even just bending a cable can drastically change it's amplitude and phase response! \$\endgroup\$– SamCommented Dec 4, 2016 at 22:53
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Two cables that are gain and phase matched have their complex attenuation, that is their gain from end to end in dB, or their loss if you want to call it that, and their phase shift in degrees, that is their 'electrical length', the same to within a specified tolerance of each other, up to a specified frequency.
So for instance, two 1m cables matched to 0.1dB and 1 degree over DC-10GHz would be very expensive, and may not even be obtainable at all. Relax the spec to 1dB and 10 degrees over DC to 1GHz, I could make them on my bench without specialist equipment.
