US3614675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isolator comprising tuned lumped element circulator
Assignee: Japan Broadcasting Corp
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Filing: 1969-09-22
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Granted: 1971-10-19
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Expires: 1989-09-22
Abstract
Abstract The present invention relates to an isolator having a low forward direction loss over a very wide frequency range and a sufficiently high backward loss in a desired frequency range, and having a very compact configuration and a simple construction. The isolator according to the present invention comprises a lumped element type circulator which is operative in the desired frequency range, a resonant circuit having its impedance characteristics to be at low impedance in said frequency range and to be at high impedance outside of said frequency range and being connected between outer conductor of the lumped element type circulator and a ground conductor, and an absorbing resistor connected between one of the terminals of the circulator and the outer conductor or the ground conductor.
Inventors
- 👤 Yoshihiro Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; H01P1/387; H04; H04B; H04B15/00; H04B15/02; H04B15/04; H04B15/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
An isolator comprising a circulator mounted on a ground conductor having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, the outer conductor being insulated from the ground conductor with respect to high frequency energy, a two-Terminal network being series resonant at center frequency of the operational frequency range of the circulator and connected between the outer conductor and the ground conductor, and an absorbing resistor connected between one of the circulator terminals and the ground conductor, wherein the other of said plurality of circulator terminals and the ground conductor comprise input and output terminals of the isolator.
Claim 2
Dependent Claim
132 words
An isolator comprising a circulator mounted on a ground conductor having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, the outer conductor being insulated from the ground conductor with respect to high frequency energy, a two-Terminal network being series resonant at center frequency of the operational frequency range of the circulator and connected between the outer conductor and the ground conductor, and an absorbing resistor connected between one of the circulator terminals and the ground conductor, wherein the other of said plurality of circulator terminals and the ground conductor comprise input and output terminals of the isolator.
Claim 3
Dependent Claim
57 words
An isolator as claimed in claim 1, further comprising a network which passes signals in the operational frequency range of the circulator with low attenuation and having a high impedance which is nearly equivalent to open impedance for signals having frequencies outside of the operational frequency range, which network is connected in series with the absorbing resistor.
Claim 4
Dependent Claim
36 words
An isolator as claimed in claim 1, wherein the circulator is constructed as a lumped element type circulator of which inner conductors are formed by printed circuits printed on an insulator base to form meshed configuration.
Claim 5
Dependent Claim
135 words
An isolator comprising a circulator mounted on a ground conductor having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, the outer conductor being insulated from the ground conductor with respect to high frequency energy, a two-terminal network being series resonant at center frequency of the operational frequency range of the circulator and connected between the outer conductor and the ground conductor, and an absorbing resistor connected between one of said plurality of circulator terminals and the outer conductor , wherein the other of said plurality of circulator terminals and the ground conductor comprise input and output terminals of the isolator.
Claim 6
Dependent Claim
135 words
An isolator comprising a circulator mounted on a ground conductor having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, the outer conductor being insulated from the ground conductor with respect to high frequency energy, a two-terminal network being series resonant at center frequency of the operational frequency range of the circulator and connected between the outer conductor and the ground conductor, and an absorbing resistor connected between one of said plurality of circulator terminals and the outer conductor , wherein the other of said plurality of circulator terminals and the ground conductor comprise input and output terminals of the isolator.
Claim 7
Dependent Claim
36 words
An isolator as claimed in claim 4, wherein the circulator is constructed as a lumped element type circulator of which inner conductors are formed by printed circuits printed on an insulator base to form meshed configuration.
Claim 8
Dependent Claim
113 words
A balanced type isolator device comprising two circulators, each having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, a two-terminal network being series resonant at center frequency of operational frequency range of the circulators and connected between the outer conductors of the two circulators, and an absorbing resistor connected between one of the terminals of each circulator, wherein the other of said plurality of circulator terminals of each circulator comprises input and output terminals for the isolator device.
Claim 9
Dependent Claim
113 words
A balanced type isolator device comprising two circulators, each having an outer conductor, at least one inner conductor having a central coupling portion and a plurality of end portions each extending from corresponding terminals located at the periphery of the circulator and at least one ferrite element loaded at the central coupling portion, a two-terminal network being series resonant at center frequency of operational frequency range of the circulators and connected between the outer conductors of the two circulators, and an absorbing resistor connected between one of the terminals of each circulator, wherein the other of said plurality of circulator terminals of each circulator comprises input and output terminals for the isolator device.
Claim 10
Dependent Claim
53 words
A balanced type isolator device as claimed in claim 6, further comprising a network which passes signals in the operational frequency range of the circulator with low attenuation and having a high impedance for signals having frequencies outside of the operational frequency range, which network is connected in series with said absorbing resistor.
Claim 11
Dependent Claim
41 words
A balanced type isolator device as claimed in claim 6, wherein each of the circulators is constructed as a lumped element type circulator of which inner conductors as formed by printed circuits printed on an insulator base to form meshed configuration.
Claim 12
Dependent Claim
130 words
A wide band isolator device comprising a plurality of isolator devices connected in cascade, each having a different operational frequency range and mounted on a common ground plate, wherein each of said isolator devices includes a circulator having an outer conductor insulated from a ground conductor with respect to high frequency energy, a two-terminal network being series resonant at a center frequency of operational frequency range of the relevant circulator and connected between the outer conductor of Said relevant circulator and the ground conductor thereof, and an absorbing resistor connected between one of the circulator terminals and the outer conductor of said relevant circulator, wherein the other of the circulator terminals and the ground conductor comprise input and output terminals for the cascade connection in each of the isolator devices.
Claim 13
Dependent Claim
130 words
A wide band isolator device comprising a plurality of isolator devices connected in cascade, each having a different operational frequency range and mounted on a common ground plate, wherein each of said isolator devices includes a circulator having an outer conductor insulated from a ground conductor with respect to high frequency energy, a two-terminal network being series resonant at a center frequency of operational frequency range of the relevant circulator and connected between the outer conductor of Said relevant circulator and the ground conductor thereof, and an absorbing resistor connected between one of the circulator terminals and the outer conductor of said relevant circulator, wherein the other of the circulator terminals and the ground conductor comprise input and output terminals for the cascade connection in each of the isolator devices.
Claim 14
Dependent Claim
130 words
A wide band isolator device comprising a plurality of isolator devices connected in cascade, each having a different operational frequency range and mounted on a common ground plate, wherein each of said isolator devices includes a circulator having an outer conductor insulated from a ground conductor with respect to high frequency energy, a two-terminal network being series resonant at a center frequency of operational frequency range of the relevant circulator and connected between the outer conductor of said relevant circulator and the ground conductor thereof, and an absorbing resistor connected between one of the circulator terminals and the ground conductors of said relevant circulator, wherein the other of the circulator terminals and the ground conductor comprise input and output terminals for the cascade connection in each of the isolator devices.
Claim 15
Dependent Claim
130 words
A wide band isolator device comprising a plurality of isolator devices connected in cascade, each having a different operational frequency range and mounted on a common ground plate, wherein each of said isolator devices includes a circulator having an outer conductor insulated from a ground conductor with respect to high frequency energy, a two-terminal network being series resonant at a center frequency of operational frequency range of the relevant circulator and connected between the outer conductor of said relevant circulator and the ground conductor thereof, and an absorbing resistor connected between one of the circulator terminals and the ground conductors of said relevant circulator, wherein the other of the circulator terminals and the ground conductor comprise input and output terminals for the cascade connection in each of the isolator devices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |