What is an RF Choke?
An RF choke is an inductor that is used to block higher-frequency RF signals while passing DC and lower-frequencies AC signals through it. An RF choke usually consists of a coil of insulated wire often wound on a magnetic core or a doughnut-shaped "bead" of ferrite material strung on a wire.
RF chokes are used for eliminating digital RF noise and are often seen on computer cables. It prevents EMI (Electro-magnetic Interference) and RFI (Radio frequency Interference) from entering the DC supply lines.
Important parameters when looking for an RF choke:
Frequency: This refers to the radio frequency range that an RF choke blocks.
Impedance: It is the total resistance an RF choke presents to the electrical current passing through it.
Inductance: It is the value of maximum charge induced in an RF choke due to current passing through it.
Rated Voltage and Current: It is the highest value of voltage and current an RF choke can handle.
