ISOLATORS ARE USED TO ISOLATE THE PATH OF THE RECIEVED AND TRANSSMITED AND DOWNLINK THEM TO THE IF STAGE OF THE MICROWAVE TRANCIVERS,ON THE OTHER HAND,COUPLERS ARE USED TO MATCH DIFFERIENT MEDIA OR CHANEELS TO GOTHER,THE WAVE GUIED TO SPACE,OR ANY OTHER TO COMPONENTS IN A MICROWAVE DEVICE
ATTENUATORS AND LIMMITERS ARE BOATH USED TO REDUCE THE POWER OF A MICROWAVE SIGNAL.BUT ATTENUATORS ARE FREQUENCY SELECTED,SO, IT IMPACTS A CERTIN FREQUENCY COMPONENT WITHIN THE SPECTRUM OF THE SIGNAL.