Non-magnetic variable inductors combine small size with high performance

These Johanson Manufacturing-branded variable inductors, from Knowles Precision Devices, combine small size and high performance with non-magnetic properties. Inductors and variable inductors are essential elements of many RF products. They are used for matching and loading power amplifiers, low noise amplifiers and mixers, as well as for providing frequency-selective resonant circuits in variable-frequency oscillators. With an overall height of only 9mm/0.35" in SMD, vertical SMD and thru-hole versions, they are perfect for applications compatible with MRI/NMR systems, power amplifiers, radar, radios/jammers, 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 ensure a constant winding pitch and consistent relationship to the PCB. Tuning is done using threaded PTFE and Non-Magnetic Copper Alloy core. They have excellent shock, vibration and thermal tolerances and operate over the temperature band -40C to +85C. Catalogue parts have nominal values of 33nH to 118nH, 2 to 7 turns with Q as high at 121:100MHz, SRF 0.7 – 1.2GHz with customised versions available for non-catalogued values. All parts are RoHS compliant.