4 Layer Rogers FR4 RF Microwave PCB 77GHz High Frequency

4 Layer Rogers with Fr4 Mix stack up PCB 77 GHZ RF Radio Microwave High Frequency Circuit Board

Radio Frequency (RF) refers to electromagnetic frequencies between 300KHz to 300GHz that can be radiated into space. RF current represents high frequency alternating electromagnetic waves. Currents changing more than 10,000 times per second are considered high frequency, with radio frequencies being the higher bands of this spectrum.

In electronic theory, alternating current through a conductor generates an electromagnetic field. At frequencies above 100kHz, these waves propagate through air and reflect off the ionosphere, enabling long-distance transmission. This RF technology is fundamental to wireless communications and cable television systems.