US3593222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave series switch biasing circuit
Assignee: Skyworks Solutions Inc
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Filing: 1969-05-21
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Granted: 1971-07-13
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Expires: 1989-05-21
Abstract
Abstract A series biasing circuit includes a three terminal filter circuit within an outer conductor defining a cavity. The filter circuit has two signal terminals extending through and insulated from the wall of the cavity and common terminals connected to the cavity. A conducting wire extends through and is insulated from the outer conductor and into the cavity and connects to the filter circuit at a point which is capacitively insulated from the outer conductor. Portions of the inner conductors coact with the outer conductor within the cavity to define substantially inductive transmission line segments. These substantially inductive segments coact with substantially capacitive elements to define a substantially reflectionless filter circuit.
Inventors
- 👤 Peter A Rizzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:13
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/15; H03; H03H; H03H7/00; H03H7/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
245 words
A broadband series biasing circuit operative over a predetermined microwave frequency range comprising, means defining first and second terminal pairs each having a signal terminal and a reference terminal, first conducting means defining a cavity and normally maintained at a reference potential intercoupling reference ones of each of said terminal pairs, means wherein said cavity defining a substantially reflectionless high pass filter circuit that is one of pi and T networks formed of substantially inductive and substantially capacitive elements intercoupling said signal terminals and having a biasing substantially capacitive element having one terminal contacting said first conducting means and its other terminal in series with a first substantially inductive element that is a lead connected to at least one other capacitive element connected to the junction of a second inductive element and said first signal terminal, said substantially reflectionless high pass filter circuit presenting a substantially constant predetermined impedance to said first and second terminal pairs over said predetermined microwave frequency range, and means defining a biasing signal terminal extending through and insulatedly separated from said first conducting means and connected to said other terminal, said reflectionless high pass filter circuit comprising means for establishing an RF path between the signal terminals of said first and second terminal pairs and a conductive path for carrying a DC bias potential between said biasing signal terminal and at least one of said signal terminals, said signal terminals extending through and insulatedly separated from said first conducting means,
Claim 2
Dependent Claim
245 words
A broadband series biasing circuit operative over a predetermined microwave frequency range comprising, means defining first and second terminal pairs each having a signal terminal and a reference terminal, first conducting means defining a cavity and normally maintained at a reference potential intercoupling reference ones of each of said terminal pairs, means wherein said cavity defining a substantially reflectionless high pass filter circuit that is one of pi and T networks formed of substantially inductive and substantially capacitive elements intercoupling said signal terminals and having a biasing substantially capacitive element having one terminal contacting said first conducting means and its other terminal in series with a first substantially inductive element that is a lead connected to at least one other capacitive element connected to the junction of a second inductive element and said first signal terminal, said substantially reflectionless high pass filter circuit presenting a substantially constant predetermined impedance to said first and second terminal pairs over said predetermined microwave frequency range, and means defining a biasing signal terminal extending through and insulatedly separated from said first conducting means and connected to said other terminal, said reflectionless high pass filter circuit comprising means for establishing an RF path between the signal terminals of said first and second terminal pairs and a conductive path for carrying a DC bias potential between said biasing signal terminal and at least one of said signal terminals, said signal terminals extending through and insulatedly separated from said first conducting means,
Claim 3
Dependent Claim
89 words
A broadband series biasing circuit in accordance with claim 1 wherein said substantially reflectionless high pass filter circuit is a pi network having said one other substantially capacitive element intercoupling said signal terminals, a first series circuit comprising said second substantially inductive element and a third substantially capacitive element intercoupling one of said signal terminals with said first conducting means and a second series circuit comprising said first substantially inductive element and said biasing substantially capacitive element intercoupling the other of said signal terminals with said first conducting means.
Claim 4
Dependent Claim
92 words
A broadband series biasing circuit in accordance with claim 1 wherein said substantially reflectionless filter circuit is a T network having a first parallel circuit comprising said second substantially inductive element and said one other substantially capacitive element in series with a second parallel circuit comprising a third substantially inductive element and a third substantially capacitive element intercoupling said signal terminals and a series circuit comprising said first substantially inductive element and said biasing substantially capacitive element intercoupling the junction of said first and second parallel circuits with said first conducting means.
Claim 5
Dependent Claim
57 words
A broadband biasing circuit in accordance with claim 2 wherein conductors insulatedly separated from said first conducting means comprise said substantially inductive elements and coact with said first conducting means to define transmission line segments corresponding substantially to a quarter wavelength at a predetermined highest frequency of interest in said predetermined microwave frequency range has been inserted.
Claim 6
Dependent Claim
56 words
A broadband biasing circuit in accordance with claim 3 wherein conductors insulatedly separated from said first conducting means comprise said substantially inductive elements and coact with said first conducting means to define transmission line segments corresponding substantially to a quarter wavelength at a predetermined highest frequency of interest in said predetermined microwave range has been inserted.
Claim 7
Dependent Claim
38 words
A broadband biasing circuit in accordance with claim 4 and further comprising unilaterally conducting means to be biased intercoupling at least one of said signal terminals DC coupled to said biasing signal terminal with said first conducting means,
Claim 8
Dependent Claim
38 words
A broadband biasing circuit in accordance with claim 5 and further comprising unilaterally conducting means to be biased intercoupling at least one of said signal terminals DC coupled to said biasing signal terminal with said first conducting means.
Claim 9
Dependent Claim
27 words
A broadband biasing circuit in accordance with claim 6 and further comprising a source of biasing potential intercoupling said biasing signal terminal with said first conducting means.
Claim 10
Dependent Claim
28 words
A broadband biasing circuit in accordance with claim 7 and further comprising a source of a biasing potential intercoupling said biasing signal terminal with said first conducting means.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |