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US 12,132,461 B2Granted
Magnetically tunable ferrimagnetic filter
AssigneeIntegrated Microwave Corporation
InventorsRonald Parrott, Szu-Fan Wang, Robert Cordis, Martin Hernandez
Life of this patent
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Abstract
A magnetically tunable ferrimagnetic filter, including a top casing, a top magnetic conductor, a bottom magnetic conductor, coils, a balance coil, ferrimagnetic-based filters, and a bottom casing. The ferrimagnetic-based filters utilize ferrimagnetic resonator elements, such as yttrium-iron-garnet (YIG), configured to reduce a magnetic gap of the YIG filter and thereby to improve performance.
Claims18
A magnetically tunable ferrimagnetic filter, comprising:
- a top magnetic conductor having integral first and second cylindrical poles;
- a bottom magnetic conductor;
- at least first and second tunable coils disposed between said top magnetic conductor and said bottom magnetic conductor, said first tunable coil surrounding said first cylindrical pole and configured to create a first polarity, said second tunable coil surrounding said second cylindrical pole and configured to create a second polarity opposite that of said first polarity, each of said first and second cylindrical poles spaced apart from said bottom magnetic conductor to form a magnetic gap;
- at least two ferrimagnetic-based filters;
- an enclosure;
- and
- coupling structure to capture and secure within said enclosure, in an assembly, said top magnetic conductor, said bottom magnetic conductor, said first and second tunable coils, and said at least two ferrimagnetic-based filters;
- wherein each of said at least two ferrimagnetic-based filters are disposed on a mounting platform and include a plurality of ferrimagnetic resonator elements surrounded or partially surrounded by a radio frequency (RF) structure that couples high frequency electromagnetic (RF) energy to said ferrimagnetic resonator elements.
5 more elements
A magnetically-tunable ferrimagnetic radio frequency (RF) circuit comprising:
- a magnetic circuit comprising a gap;
- a tuning coil magnetically coupled to the magnetic circuit;
- a resonant cavity at least partially defined by a first magnetically conductive member spaced apart from a second magnetically conductive member, and a side wall, the resonant cavity located within the gap of the magnetic circuit;
- first and second ferrimagnetic elements arranged in spaced apart relation within the resonant cavity;
- and
- a transmission line comprising a first portion located for RF coupling to the first ferrimagnetic element, and a second portion located for RF coupling to the second ferrimagnetic element;
- a third ferrimagnetic element located within the resonant cavity and spaced apart from the first and second ferrimagnetic elements;
- and a shield conductor located at least partially between the first and second ferrimagnetic elements;
- wherein the first portion of the transmission line is a first RF coupling loop disposed at least partially about and separated from the first ferrimagnetic element, and the second portion of the transmission line is a second RF coupling loop disposed at least partially about and separated from the second ferrimagnetic element, and where the transmission line is devoid of an RF coupling portion proximate the third ferrimagnetic element.
6 more elements
A magnetically-tunable ferrimagnetic radio frequency (RF) circuit comprising:
- a magnetic circuit comprising a gap;
- a tuning coil magnetically coupled to the magnetic circuit;
- a resonant cavity at least partially defined by a first magnetically conductive member spaced apart from a second magnetically conductive member, and a side wall, the resonant cavity located within the gap of the magnetic circuit;
- first and second ferrimagnetic elements arranged in spaced apart relation within a space between first and second dielectric members located in the resonant cavity;
- a transmission line comprising a first RF coupling loop portion disposed at least partially about the first ferrimagnetic element, and a second RF coupling loop portion disposed at least partially about the second ferrimagnetic element;
- a third ferrimagnetic element located between the first and second dielectric members and spaced apart from the first and second ferrimagnetic elements;
- and
- a shield conductor located at least partially between the first and second ferrimagnetic elements,
- wherein RF energy is couplable between the third ferrimagnetic element and the first and second ferrimagnetic elements, and the third ferrimagnetic element does not have a transmission line portion located for RF coupling to the third ferrimagnetic element.
6 more elements
Dependencies are inferred from the claim text.