Patent US3838367A successfully refreshed from Google Patents.
US3838367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microstrip filter comprising a ferromagnetic resonant body
Assignee: US Philips Corp
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Filing: 1973-10-23
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Granted: 1974-09-24
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Expires: 1993-10-23
Abstract
Abstract A YIG crystal filter, notably for use in mixing circuits, by means of which, in addition to a frequency separation, a separation of even and odd waves on a double line can be realized. According to the invention, the transmission properties are substantially improved by interconnecting points of the double line at the area of the YIG crystal by means of a transmission line having a length of one half wavelength related to the magnetic resonant frequency of the YIG crystal.
Inventors
- 👤 H Bex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:36
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218; H01P1/201; H01P1/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
An electric band-pass filter in which a first transmission line is magnetically coupled to a second transmission line, extending perpendicular thereto, by way of at least one body of ferro-magnetic material which is magnetically pre-polarized in the direction perpendicular to the directions of the transmission lines with a strength such that magnetic resonance occurs at the desired band-pass frequency, the first transmission line being formed by two conductors and an earthed return conductor, it being possible for even and odd waves to appear on the said two conductors, the said two conductors being symmetrically arranged with respect to the magnetic body such that the magnetic field of the even waves is mainly perpendicular to the pre-polarization direction at the area of the magnetic body, that of the odd waves extending mainly parallel to the pre-polarization direction, characterized in that the first transmission line is terminated on one end by a detour line having an electrical length of approximately one half wavelength related to the magnetic resonant frequency.
Claim 2
Dependent Claim
167 words
An electric band-pass filter in which a first transmission line is magnetically coupled to a second transmission line, extending perpendicular thereto, by way of at least one body of ferro-magnetic material which is magnetically pre-polarized in the direction perpendicular to the directions of the transmission lines with a strength such that magnetic resonance occurs at the desired band-pass frequency, the first transmission line being formed by two conductors and an earthed return conductor, it being possible for even and odd waves to appear on the said two conductors, the said two conductors being symmetrically arranged with respect to the magnetic body such that the magnetic field of the even waves is mainly perpendicular to the pre-polarization direction at the area of the magnetic body, that of the odd waves extending mainly parallel to the pre-polarization direction, characterized in that the first transmission line is terminated on one end by a detour line having an electrical length of approximately one half wavelength related to the magnetic resonant frequency.
References Cited (Backward Citations)
US3560884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |