The resonator amplifies oscillations within a particular frequency band, while reducing oscillations at other frequencies outside the band.
This is typically done via a resonator – in its simplest form, a circuit with a capacitor and an inductor form a tuned circuit. However, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune into a particular frequency (or frequency range). To receive radio signals an antenna must be used.
Although radio frequency is a rate of oscillation, the term "radio frequency" or its abbreviation "RF" are used as a synonym for radio – i.e., to describe the use of wireless communication, as opposed to communication via electric wires. RF usually refers to electrical rather than mechanical oscillations. Radio frequency (RF) is any of the electromagnetic wave frequencies that lie in the range extending from around 3 kHz to 300 GHz, which include those frequencies used for communications or radar signals.
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