The RF Engineers are the professional experts known within the electrical engineering arena of IT and Telecom sector.
They are also called Radio Frequency Engineer.
Usually, engineers work with gadgets that send or receive radio waves, with wireless devices, radios, and mobile phones.
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz.
Simply put, if you are an RF Engineer, the job outlook is very good.