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employment radio , television , military related jobs technologist , broadcast engineer , engineering technician , technical operator radio-frequency (rf) engineering is a subset of electronic engineering involving the application of transmission line , waveguide , antenna and electromagnetic field
principles to the design and application of devices that produce or utilize signals within the radio band , the frequency range of about khz up to ghz . [ ] [ ] [ ] it is incorporated into almost everything that transmits or receives a radio wave , which includes, but is not limited to, mobile phones...
https://en.wikipedia.org/wiki/RF_circuit