US 12,424,372 B2
Temperature insensitive inductor
Leonard Goldman, Bala Cynwyd, PA (US)
Assigned to LRT Sensors LLC, Philadelphia, PA (US)
Filed by LRT Sensors LLC, Philadelphia, PA (US)
Filed on Jun. 20, 2023, as Appl. No. 18/211,672.
Application 18/211,672 is a continuation in part of application No. 18/099,589, filed on Jan. 20, 2023, granted, now 12,188,796.
Application 18/099,589 is a continuation in part of application No. 17/616,608, granted, now 11,828,628, previously published as PCT/US2020/033164, filed on May 15, 2020.
Claims priority of provisional application 62/856,886, filed on Jun. 4, 2019.
Prior Publication US 2023/0386724 A1, Nov. 30, 2023
Int. Cl. H01F 27/00 (2006.01)
CPC H01F 27/008 (2013.01) 11 Claims
OG exemplary drawing
 
1. An inductor for use as a passive electronic component, the inductor comprising:
a hollow ceramic tube, the hollow ceramic tube having a diameter and a first coefficient of thermal expansion;
a metal target rod located inside the hollow ceramic tube, the metal target rod having a diameter and a second coefficient of thermal expansion;
a coil wound on the outside of the hollow ceramic tube and having a first end and a second end; and
a first terminal engaging the first end of the coil and a second terminal engaging the second end of the coil,
wherein the metal target rod is fixed relative to the coil at a position so that the inductor has a zero temperature coefficient, and
wherein the first coefficient of thermal expansion multiplied by of the diameter of the hollow ceramic tube matches the second coefficient of thermal expansion multiplied by of the diameter of the metal target rod.