Inductive device including permanent magnet and associated methods
First Claim
1. A radio frequency (RF) inductor comprising:
- an electrically non-conductive, ferrimagnetic core having a toroidal shape defining an interior;
a wire coil surrounding at least a portion of the core;
at least one permanent magnet body at a fixed position within the interior of the core; and
an electrically conductive RF shielding layer on the at least one permanent magnet body.
1 Assignment
0 Petitions
Accused Products
Abstract
The radio frequency (RF) inductor includes a core being electrically non-conductive and ferrimagnetic, and having a toroidal shape, and a wire coil thereupon. At least one permanent magnet body is at a fixed position within the interior of the core, and an electrically conductive RF shielding layer is on the at least one permanent magnet body. The core may be ferrite for example. The electrically conductive RF shielding layer may be a conductive plating layer or a metal foil surrounding the permanent magnet body, for example. A magnetic field from the permanent magnet is applied to the inductor core to reduce losses, and the permanent magnet may be enclosed within the conductive shield to keep RF fields out. The inductor may be made small and have increased Q and resulting efficiency. The RF inductor may be applicable to RF communication circuits, for example, as an antenna coupler.
11 Citations
20 Claims
-
1. A radio frequency (RF) inductor comprising:
-
an electrically non-conductive, ferrimagnetic core having a toroidal shape defining an interior; a wire coil surrounding at least a portion of the core; at least one permanent magnet body at a fixed position within the interior of the core; and an electrically conductive RF shielding layer on the at least one permanent magnet body. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A radio frequency (RF) inductor comprising:
-
a ferrite core having a toroidal shape defining an interior; a wire coil surrounding at least a portion of the ferrite core; at least one permanent magnet body at a fixed position within the interior of the core and defining a magnetic axis intersecting the core at first and second opposing locations thereof; and an electrically conductive RF shielding layer on the at least one permanent magnet body. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A method for making a radio frequency (RF) inductor comprising:
-
providing an electrically non-conductive, ferrimagnetic core having a toroidal shape defining an interior; positioning a wire coil surrounding at least a portion of the core; positioning at least one permanent magnet body at a fixed position within the interior of the core; and providing an electrically conductive RF shielding layer on the at least one permanent magnet body. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification