unidirectionalunidirectional antennaunidirectional circuitunidirectional couplerunidirectional currentunidirectional hydrophoneunidirectional log periodic antennaunidirectional microphoneunidirectional networkunidirectional transduserunidirectional voltageunifiedunified machine theoryunifilaruniformuniform distributionuniform fielduniform lineuniform plane waveuniform transmission lineuniformityuniformlyuniformly distributed circuituniformly stableunijunctionunijunction transistorunilateralunilateral area trackunilateral bearingunilateral conductivityunilateral deviceunilateral figure of meritunilateral power gainunilateral transducerunilateralizationunimpeded harmonic operationuninterruptible power supply systemunipolaruniqueuniquelyuniquenessuniqueness theoremunitunit cellunit chargeunit doubletunit functionunit gainunit gain bandwidthunit impulse
