Patent EP0196918A2 successfully refreshed from Google Patents.
EP0196918A2
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Ferromagnetic resonators
Assignee: Sony Corp
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Filing: 1986-04-01
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Granted: —
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Expires: 2006-04-01
Abstract
Abstract A ferromagnetic resonator comprises a non-magnetic substrate (21), a ferrimagnetic thin film element (22) formed on a major surface of the non-magnetic substrate (21), a strip line (23) formed for example on another major surface of the non-magnetic substrate (21) and electromagnetically coupled to the ferrimagnetic thin film element (22), a conductive wall (24) facing the strip line (23) and spaced therefrom by a predetermined distance, an end of the strip line (23) being connected by the conductive wall (24) to ground potential, and a bias magnetic field source (26) applying a dc magnetic field to the ferrimagnetic thin film element perpendicular to the major surface thereof. Such an arrangement enables a drastic reduction in the effective dielectric constant of the transmission lines, whereby a filter with a high centre frequency of the order of at least ten gigahertz can be achieved despite the "short" type of structure.
Inventors
- 👤 Yoshikazu C/O Sony Corporation Murakami
- 👤 Seigo C/O Sony Corporation Ito
- 👤 Hiromi C/O Sony Corporation Okamoto
- 👤 Hideo C/O Sony Corporation Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:28
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A ferromagnetic resonator comprising: a non-magnetic substrate (21), a ferrimagnetic thin film element (22) formed on a major surface of the non-magnetic substrate (21), a strip line (23) disposed at another major surface of the non-magnetic substrate (21) and electromagnetically coupled to the ferrimagnetic thin film element (22), a conductive wall (24) connected or connectable to ground potential, the wall facing the strip line (23) and being spaced at a predetermined distance therefrom, an end of the strip line (23) being connected to the conductive wall (24), and bias magnetic field means (26) for applying a dc magnetic field to the ferrimagnetic thin film element (22) perpendicular to the major surface thereof.
Claim 2
Dependent Claim
112 words
A ferromagnetic resonator comprising: a non-magnetic substrate (21), a ferrimagnetic thin film element (22) formed on a major surface of the non-magnetic substrate (21), a strip line (23) disposed at another major surface of the non-magnetic substrate (21) and electromagnetically coupled to the ferrimagnetic thin film element (22), a conductive wall (24) connected or connectable to ground potential, the wall facing the strip line (23) and being spaced at a predetermined distance therefrom, an end of the strip line (23) being connected to the conductive wall (24), and bias magnetic field means (26) for applying a dc magnetic field to the ferrimagnetic thin film element (22) perpendicular to the major surface thereof.
Claim 3
Dependent Claim
243 words
A filter device utilising ferromagnetic resonance, the device comprising: a non-magnetic substrate (21), first, second, and third ferrimagnetic thin film elements (22A, 22B, 22C) formed on a major surface of the non-magnetic substrate (21), a first strip line (23A) disposed at another major surface of the non-magnetic substrate (21) and electromagnetically coupled to the first ferrimagnetic thin film element (22A), a second strip line (23B) disposed at said other major surface of the non-magnetic substrate (21) and electromagnetically coupled to the second ferrimagnetic thin film element (22B), a conductive wall (24) connected or connectable to ground potential, the wall (24) facing each of the first and second second strip lines (23A, 23B) and being spaced at a predetermined distance therefrom, an end of the first strip line (23A) being connected or connectable to an input circuit, and another end of the first strip line (23A) being terminated at the conductive wall (24), an end of the second strip line (23B) being connected or connectable to an output circuit, and another end of the second strip line (23B) being terminated at the conductive wall (24), the third ferrimagnetic thin film element (22C) being provided between the first and second ferrimagnetic thin film elements (22A, 22B) and magnetically coupled to the first and second ferrimagnetic thin film elements (22A, 22B), and bias magnetic field means (26) for applying a dc bias magnetic field to the ferrimagnetic thin film elements perpendicular to the major surface thereof.
Claim 4
Dependent Claim
243 words
A filter device utilising ferromagnetic resonance, the device comprising: a non-magnetic substrate (21), first, second, and third ferrimagnetic thin film elements (22A, 22B, 22C) formed on a major surface of the non-magnetic substrate (21), a first strip line (23A) disposed at another major surface of the non-magnetic substrate (21) and electromagnetically coupled to the first ferrimagnetic thin film element (22A), a second strip line (23B) disposed at said other major surface of the non-magnetic substrate (21) and electromagnetically coupled to the second ferrimagnetic thin film element (22B), a conductive wall (24) connected or connectable to ground potential, the wall (24) facing each of the first and second second strip lines (23A, 23B) and being spaced at a predetermined distance therefrom, an end of the first strip line (23A) being connected or connectable to an input circuit, and another end of the first strip line (23A) being terminated at the conductive wall (24), an end of the second strip line (23B) being connected or connectable to an output circuit, and another end of the second strip line (23B) being terminated at the conductive wall (24), the third ferrimagnetic thin film element (22C) being provided between the first and second ferrimagnetic thin film elements (22A, 22B) and magnetically coupled to the first and second ferrimagnetic thin film elements (22A, 22B), and bias magnetic field means (26) for applying a dc bias magnetic field to the ferrimagnetic thin film elements perpendicular to the major surface thereof.
References Cited (Backward Citations)
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