Patent US1087295A successfully refreshed from Google Patents.
Patent US3820041A successfully refreshed from Google Patents.
US3820041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonance control in interdigital capacitors useful as dc breaks in diode oscillator circuits
Assignee: Individual
•
Filing: 1973-10-04
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Granted: 1974-06-25
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Expires: 1993-10-04
Abstract
Abstract A modified stripline interdigital capacitor has slots coupled into the capacitor gap. These slots provide reactive loading to the slot transmission line formed by the gap. They are positioned and dimensioned to shift the frequency of the slot line resonance so that it is out of a selected frequency band without affecting the capacitance of the structure. This interdigital structure may be used in diode oscillator circuits to provide a dc block for isolating the input and output from the diode bias.
Inventors
- 👤 J Gewartowski
- 👤 I Tatsuguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:06
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/012; H01G2/00; H01G4/018; H01G4/06; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/32; H01P1/38; H01P1/383; H01P1/387; H01P3/00; H01P3/02; H01P3/08; H01P3/085; H03; H03H; H03H7/00; H03H7/004
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A circuit for operating in a selected frequency band comprising, a circulator having an input port, output port, and a diode port; a diode oscillator coupled to the diode port; bias means for applying a dc bias to the diode oscillator; and means for blocking the dc bias from the input and output ports, characterized in that said means for blocking the dc bias includes at least one stripline interdigital capacitor coupled to one of the ports; said one capacitor including a conductor having two sets of interconnected conductive fingers interdigitated to form a gap between the fingers of the two sets; said gap having a length such that it is capable of supporting resonance at a first frequency; said one capacitor further including at least one slot within said conductor being coupled to the gap and dimensioned to extend the effective length of the gap so that the capacitor''s resonance is shifted to a second frequency outside the selected frequency band.
Claim 2
Dependent Claim
162 words
A circuit for operating in a selected frequency band comprising, a circulator having an input port, output port, and a diode port; a diode oscillator coupled to the diode port; bias means for applying a dc bias to the diode oscillator; and means for blocking the dc bias from the input and output ports, characterized in that said means for blocking the dc bias includes at least one stripline interdigital capacitor coupled to one of the ports; said one capacitor including a conductor having two sets of interconnected conductive fingers interdigitated to form a gap between the fingers of the two sets; said gap having a length such that it is capable of supporting resonance at a first frequency; said one capacitor further including at least one slot within said conductor being coupled to the gap and dimensioned to extend the effective length of the gap so that the capacitor''s resonance is shifted to a second frequency outside the selected frequency band.
Claim 3
Dependent Claim
48 words
A circuit as claimed in claim 1 wherein said means for blocking dc bias includes said one interdigital capacitor and another interdigital capacitor, said two capacitors being coupled individually to the input port and the output port of the circulator, and said two capacitors having different resonant frequencies.
Claim 4
Dependent Claim
27 words
A circuit as claimed in claim 2 wherein said one interdigital capacitor is dimensioned so that its resonance is at a frequency below said selected frequency band.
Claim 5
Dependent Claim
29 words
A circuit as claimed in claim 3 wherein the other of said interdigital capacitors is dimensioned so that its resonance is at a frequency above said selected frequency band.
Claim 6
Dependent Claim
24 words
A circuit as claimed in claim 1 wherein said means for blocking dc bias includes a single interdigital capacitor coupled to the diode port.
Claim 7
Dependent Claim
29 words
A circuit as claimed in claim 1 wherein said slot couples to the gap substantially at a voltage null of the standing wave pattern of the resonance being shifted.
Claim 8
Dependent Claim
26 words
A circuit as claimed in claim 6 wherein said slot couples to the center of the said gap to shift the frequency of a half-wave resonance.
Claim 9
Dependent Claim
31 words
A circuit as claimed in claim 6 wherein said slot couples to the gap at a point off the center of the gap to shift the frequency of a full-wave resonance.
Claim 10
Dependent Claim
41 words
A circuit as claimed in claim 1 wherein the portion of the conductor adjacent one set of fingers is broader than the portion adjacent the other set of fingers, and said slot is cut into the broader portion of the conductor.
Claim 11
Dependent Claim
134 words
A circuit for operating in a selected frequency band comprising, a circulator having an input port, an output port, and a diode port; a diode oscillator coupled to the diode port, bias means for applying a dc bias to the diode oscillator; a pair of stripline interdigital capacitors, one coupled to the input port and the other coupled to the output port, to block the dc bias from the input and output; each of said capacitors including a conductor having two sets of interconnected conductive fingers interdigitated to form a gap between the fingers of the two sets; said gap having a length such that it is capable of supporting resonance at a given frequency; and each of said capacitors being dimensioned so that it is resonant at a frequency different from the other.
Claim 12
Dependent Claim
134 words
A circuit for operating in a selected frequency band comprising, a circulator having an input port, an output port, and a diode port; a diode oscillator coupled to the diode port, bias means for applying a dc bias to the diode oscillator; a pair of stripline interdigital capacitors, one coupled to the input port and the other coupled to the output port, to block the dc bias from the input and output; each of said capacitors including a conductor having two sets of interconnected conductive fingers interdigitated to form a gap between the fingers of the two sets; said gap having a length such that it is capable of supporting resonance at a given frequency; and each of said capacitors being dimensioned so that it is resonant at a frequency different from the other.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |