#RF ISOLATOR FERRITE CORE SERIES#

They allow high-frequency EM Signals to pass through them with low losses.

Why are Ferrites used to make Isolators and Circulators? They are used to make permanent magnets for applications such as loudspeakers and storage media in magnetic recording devices. Hard Ferrites: Hard ferrites have high coercivity, which means they are hard to demagnetize, or they can retain strong magnetic energy even after the source of the magnetic field is removed. Magnetically soft ferrites are used to make RF & Microwave components.

They are used to make efficient magnetic cores called ferrite cores for high-frequency inductors, transformers and antennas, and in various microwave components such as circulators, isolators, phase shifters, and high-speed switches. Soft Ferrites: Soft ferrites have low coercivity, which means they can be easily demagnetized, or they can absorb magnetic energy without retaining it. They are low cost and have excellent corrosion resistance, which add to the benefits of using ferrite materials.įerrite devices are divided into two categories based on their resistance of being demagnetized (magnetic coercivity): They are also used as a component of radar-absorbing materials or coatings used in stealth aircraft and in the absorption tiles lining the rooms used for electromagnetic compatibility (EMC) measurements.įerrites are ferrimagnetic materials – meaning they can be attracted to a magnet – made by mixing iron oxide with one or more additional metal (or metal oxide) such as Manganese, Zinc, Nickel, etc. Ferrites are used to construct isolators, circulators phase shifters, variable attenuators, modulators and switches in microwave systems.

The combination of low attenuation of EM waves and reduced eddy current makes ferrites a suitable material for various microwave devices. The non-conductive nature of these materials makes them resistant to current flow which leads to reduced eddy currents. They also allow Electromagnetic waves/signals to pass through at high frequencies with negligible attenuation. These materials are electrically non-conductive, and have useful magnetic properties. Ferromagnetic materials are ceramic materials which are made by mixing iron oxide with other metallic elements. See Mix Selection for other applications.įor extra large cables use the FB400-31 which has an inside diameter of 3 inches (76mm).Ferrite electrical devices are devices that are constructed using Ferromagnetic materials. Use Mix 61 for VHF and above for RFI/EMI suppression and below 30 Mhz for multi-ratio impedance transformers (baluns/ununs). USE FB102-31 for 4 turns of RG-8X for 16X increase in Z per bead – see pictures below for examples).

#RF ISOLATOR FERRITE CORE SERIES#

If you need more Z, just use more beads in series on the cable or use more windings thru a larger ID bead (e.g. Mix 31 has better response below 10 Mhz but above 10 Mhz mix 31 and mix 43 are very close. For 500 ohms we would need 5 mix 31 beads or 6 mix 43 beads to have greater than 500 ohms. For example if you have a 50 ohm RG-8 coax cable and want a choking impedance of 500 ohms at 10 Mhz, you can check the FB102 column (since FB102 will pass RG-8 through its center ID) at 10Mhz and find that Mix 31 has a Z of 108 ohms/bead and Mix 43 has a Z of 91 ohms/bead. Application Note: Use impedances for each bead at your desired frequency to select number of beads needed for desired Z.

Rf isolator ferrite core