
1) Microwave technology
Found on
https://www.crosswordclues.com/clue/rf-switch

RF Switch``` or ```Microwave Switch An RF (Radio Frequency) and microwave switch is a device to route high frequency signal through transmission paths. RF and microwave switches are used extensively in microwave test systems for signal routing between instruments and devices under test (DUT). Incorporating a switch into a switch matrix syste...
Found on
http://en.wikipedia.org/wiki/RF_switch
No exact match found.