Patent US3890582A successfully refreshed from Google Patents.
US3890582A
Expired / Lapsed
US
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Floating-ground microwave ferrite isolators
Assignee: Addington Laboratories Inc
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Filing: 1973-06-15
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Granted: 1975-06-17
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Expires: 1993-06-15
Abstract
Abstract A plurality of floating-ground microwave isolators, each with a different center frequency and overlapping bandwidths are serially connected, and a variable capacitance is connected between the floating-ground of each and ground, magnetic field adjusting elements are used to adjust the magnetic fields of each isolator, and a common magnetic shield covers the magnetic field areas of the isolators.
Inventors
- 👤 David Hoy Jeong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A broadband microwave isolator comprising: a. a plurality of individual floating-ground ferrite-type isolators connected in series, each having a different center frequency and wherein the bandwidths of individual isolators having adjacent center frequencies are overlapping; and wherein each of said individual floating-ground isolators comprises: 1. a lumped circuit element; 2. a pair of ferrite discs sandwiching said lumped circuit element; 3. a floating-ground plane element; and 4. means for providing a d.c. magnetic field across said sandwiched lumped circuit element and said floating-ground plane element; b. a TEM mode transmission line for providing microwave signals to said plurality of isolators; c. a variable capacitance for each individual isolator connected between the isolated floating-ground and the transmission line ground for providing means for adjusting the capacitance therebetween; and d. including means for compensating for unequal magnetic fields across said lumped circuit element and said floating-ground plane element comprising a tapered nonmagnetic shim located bEtween said magnetic field means and said ferrite discs.
Claim 2
Dependent Claim
161 words
A broadband microwave isolator comprising: a. a plurality of individual floating-ground ferrite-type isolators connected in series, each having a different center frequency and wherein the bandwidths of individual isolators having adjacent center frequencies are overlapping; and wherein each of said individual floating-ground isolators comprises: 1. a lumped circuit element; 2. a pair of ferrite discs sandwiching said lumped circuit element; 3. a floating-ground plane element; and 4. means for providing a d.c. magnetic field across said sandwiched lumped circuit element and said floating-ground plane element; b. a TEM mode transmission line for providing microwave signals to said plurality of isolators; c. a variable capacitance for each individual isolator connected between the isolated floating-ground and the transmission line ground for providing means for adjusting the capacitance therebetween; and d. including means for compensating for unequal magnetic fields across said lumped circuit element and said floating-ground plane element comprising a tapered nonmagnetic shim located bEtween said magnetic field means and said ferrite discs.
Claim 3
Dependent Claim
10 words
a pair of ferrite discs sandwiching said lumped circuit element;
Claim 4
Dependent Claim
10 words
a pair of ferrite discs sandwiching said lumped circuit element;
Claim 5
Dependent Claim
40 words
A broadband microwave isolator as in claim 1 including a single magnetic shield common to all of said plurality of individual isolators and covering the magnetic field areas thereof and wherein said shield serves additionally as the transmission line ground.
Claim 6
Dependent Claim
5 words
a floating-ground plane element; and
Claim 7
Dependent Claim
5 words
a floating-ground plane element; and
Claim 8
Dependent Claim
103 words
A microwave isolator comprising: a. a lumped circuit element; b. a pair of ferrite discs sandwiching said lumped circuit element; c. a floating-ground plane element; d. a pair of magnets aligned with said sandwiched lumped circuit element and said floating-ground plane element to provide a d.c. magnetic field thereacross; and e. means adjacent to at least one of said magnets for adjusting the magnetic field across said sandwiched lumped circuit element, and f. wherein said adjusting means includes means for compensating for unequal magnetic fields thereacross comprising a tapered non-magnetic shim located between at least one of said magnets and said ferrite discs.
Claim 9
Dependent Claim
103 words
A microwave isolator comprising: a. a lumped circuit element; b. a pair of ferrite discs sandwiching said lumped circuit element; c. a floating-ground plane element; d. a pair of magnets aligned with said sandwiched lumped circuit element and said floating-ground plane element to provide a d.c. magnetic field thereacross; and e. means adjacent to at least one of said magnets for adjusting the magnetic field across said sandwiched lumped circuit element, and f. wherein said adjusting means includes means for compensating for unequal magnetic fields thereacross comprising a tapered non-magnetic shim located between at least one of said magnets and said ferrite discs.
Claim 10
Dependent Claim
94 words
means for providing a d.c. magnetic field across said sandwiched lumped circuit element and said floating-ground plane element; b. a TEM mode transmission line for providing microwave signals to said plurality of isolators; c. a variable capacitance for each individual isolator connected between the isolated floating-ground and the transmission line ground for providing means for adjusting the capacitance therebetween; and d. including means for compensating for unequal magnetic fields across said lumped circuit element and said floating-ground plane element comprising a tapered nonmagnetic shim located bEtween said magnetic field means and said ferrite discs.
Claim 11
Dependent Claim
94 words
means for providing a d.c. magnetic field across said sandwiched lumped circuit element and said floating-ground plane element; b. a TEM mode transmission line for providing microwave signals to said plurality of isolators; c. a variable capacitance for each individual isolator connected between the isolated floating-ground and the transmission line ground for providing means for adjusting the capacitance therebetween; and d. including means for compensating for unequal magnetic fields across said lumped circuit element and said floating-ground plane element comprising a tapered nonmagnetic shim located bEtween said magnetic field means and said ferrite discs.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |