Introduction

Radio frequency is referred to as RF, radio frequency is RF current, it is a kind of high-frequency AC change electromagnetic wave for short.  Testing Lab has a complete radio frequency laboratory. Alternating current that changes less than 1000 times per second is called low-frequency current, and frequency current that is greater than 10,000 times is called high-frequency current, and radio frequency is such a high-frequency current. Cable television system is using the radio frequency transmission mode.

In electronics, an electric current flows through a conductor and a magnetic field forms around it. Alternating current passes through a conductor, and an alternating electromagnetic field is formed around the conductor, called an electromagnetic wave.