Non-magnetic variable inductors are small for avionics and MRI systems
Non-magnetic variable inductors from Johanson Manufacturing, combine small size with high performance, says Knowles Precision Devices.
Inductors and variable inductors are essential in many RF products. They are used for matching and loading low noise amplifiers, power amplifiers and mixers, as well as for providing frequency- selective resonant circuits in variable-frequency oscillators.
With an overall height of only 9.0mm or 0.35-inches in surface mount, vertical surface mount and through hole versions, the variable inductors are suitable for applications such as MRI/NMR systems, radios/jammers, power amplifiers, radar, avionics instrumentation and test equipment. These are applications where higher power handling and high Q values are essential, says Knowles.
The coils and PTFE material cores have a patented, precision-machined design to guarantee a constant winding pitch and consistent relationship to the PCB. Tuning is done by means of threaded PTFE and non-magnetic copper alloy core. The non-magnetic inductors also have shock, vibration and thermal tolerances and operate over a temperature range of -40 to +85 degree C. Catalogue parts have nominal values of 33 to 118nH, two to seven turns with Q as high at 121 : 100MHz, SRF 0.7 to 1.2GHz with customised versions available for non-cataloged values. All parts are RoHs-compliant, confirms Knowles.
Johanson Manufacturing is a world-class supplier of trimmer capacitors, non-magnetic variable inductors and microwave tuning elements. It is one of the brands under the Knowles Precision Devices brand. Other brands are Compex, Dielectric Laboratories (DLI), Novacap, Syfer Technology and Voltronics.
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