Tunable Inductors Include Non-Magnetic Cores
Mon, 05/24/2010 - 6:13am
The JLC series of high-Q variable coils from Johanson Manufacturing offers a wide tuning range of 30 nH to 133 nH and self-resonant frequencies of 700 MHz to 1500 MHz, which make them appropriate tuning devices for many RF applications. These coils also feature a non-magnetic core for use in MRI systems or other magnetically sensitive circuits. Sample kits (JMC-SMTCOIL-KIT), which include three pieces each of six different Johanson variable coils (surface mount) and a tuning tool, are available from stock. In addition to the MRI applications, these coils are used in RF amplifiers, RF test and measurement systems, and defense electronics systems. With an overall height of 0.35 inches, these variable inductors suit applications where low-profile circuit boards are essential. Tuning is done by means of a threaded PTFE and non-magnetic copper alloy core. The coils and their cores are made to precise specifications. As such, they guarantee a constant winding pitch and consistent relationship to the printed circuit board. Each Johanson variable coil is RoHS compliant.