Non-Magnetic Variable Inductors

Knowles Johanson Manufacturing's non-magnetic variable inductors combine small size and high performance with non-magnetic properties. Inductors and variable inductors are necessary elements of many RF products. They are used for matching and loading low noise amplifiers, power amplifiers, and mixers, as well as for providing frequency in selective resonant circuits in variable frequency oscillators.

The overall height of only 9 mm (0.35 in.) in SMD, vertical SMD, and through-hole versions make these inductors ideal for applications consistent with MRI/NMR systems, radios and jammers, power amplifiers, radar, avionics instrumentation, and test equipment applications where higher power handling and high-Q values are essential.

The coils and PTFE cores have a patented, precision-machined design to guarantee a constant winding pitch and consistent relationship to the printed circuit board. Tuning is done by means of threaded PTFE and non-magnetic copper alloy core. They have superb shock, vibration, and thermal tolerances and operate over the temperature band -40°C to +85°C. Catalog parts have nominal values of 33 nH to 118 nH, 2 to 7 turns with Q as high as 121 @ 100 MHz, SRF 0.7 GHz to 1.2 GHz with customized versions available for non-cataloged values. All parts are RoHS compliant.