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Fixed attenuators can
be designed to have either equal or unequal impedances and to
provide any amount of attenuation (theoretically) equal to or
greater than the configuration's minimum attenuation - depending on
the ratio of Z1/Z2. Attenuators with equal
terminations have a minimum attenuation of 0 dB. Unequal
terminations place a lower limit on the attenuation.
K = power in / power
out, or in decibels = 10 * log (K) dB
 ,
or in decibels KMIN
= 10 * log (Kmin) dB
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