RADradianUnit of angle. There are 2pi radians in 360 degrees. Rad can also mean bad to a young engineer, which of course means good.
RADARradio detection and ranging--
RBWresolution bandwidthAn oscilloscope term.
RCresistance x capacitanceGenerally a time constant,
RCSradar cross-section--
R&DResearch and developmentAlternatively, remorse and disappointment.
RETMARadio Electronics Television Manufacturers AssociationDefunct group that developed standardized component values that are still used today.
RFradio frequencyAs in "whats the frequency, Dan Rather?"
RFICradio frequency integrated circuitThe silicon cousin of MMIC.
RFIDradio frequency identificationWhat Walmart uses to track inventory.
RHCPright-hand circularly polarizedCircular polarization is often used in communications systems.
RIEreactive ion etchingA method of dry etching.
RKEremote keyless entryRF device that opens your car door.
RLreturn lossMagnitude of S11 in decibels.
RMSroot-mean-squareOften used to evaluate phase and amplitude errors over many states.
RNnoise resistance--
RPNresidual phase noise--
RSSroot-sum-squareUsed in evaluating the composite error of many contributors, as opposed to worst-case.
RTArapid thermal annealing--
RTDresonant tunneling diode, resistor temperature device or detectorOne is a new semiconductor used in MMW, the other is like an expensive thermistor
RTOLroom temperature operating lifeA reliability test that takes a very long time!
RXreceiveAn abbreviation sometimes used for receive.
Author: Unknown Editor