Patent US3846724A successfully refreshed from Google Patents.
US3846724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable attenuator with p-i-n diodes
Assignee: SABA GmbH
•
Filing: 1973-07-25
•
Granted: 1974-11-05
•
Expires: 1993-07-25
Abstract
Abstract An antenna and television receiver are interconnected by an adjustable attenuator in the form of a pi network having a longitudinal branch with a p-i-n diode, an antenna cross branch with high frequency short-circuiting and adjustable control means, and a receiver cross branch with high frequency shortcircuiting means and a second p-i-n diode coupled to a positive bias source whereby variable attenuation is accompanied by substantially constant input and output impedances.
Inventors
- 👤 G Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:21
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0052; H03G1/0058; H03H; H03H7/00; H03H7/24; H03H7/25; H03H7/253; H03H7/255
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
An adjustable pi network form of attenuator comprising: a longitudinal branch including a first p-i-n diode interconnecting antenna and signal receiver terminals; an antenna cross branch including a resistor coupled to said antenna terminal and a transistor coupled to said resistor, to a potential source, and to a variable amplifier source, said antenna cross branch including a high frequency short circuiting capacitor coupling said resistor and transistor to a potential reference level; and a receiver cross branch including a second p-i-n diode coupling said receiver terminal to a positive potential source.
Claim 2
Dependent Claim
91 words
An adjustable pi network form of attenuator comprising: a longitudinal branch including a first p-i-n diode interconnecting antenna and signal receiver terminals; an antenna cross branch including a resistor coupled to said antenna terminal and a transistor coupled to said resistor, to a potential source, and to a variable amplifier source, said antenna cross branch including a high frequency short circuiting capacitor coupling said resistor and transistor to a potential reference level; and a receiver cross branch including a second p-i-n diode coupling said receiver terminal to a positive potential source.
Claim 3
Dependent Claim
112 words
An adjustable pi network form of attenuator comprising: a longitudinal branch including a first p-i-n diode interconnecting antenna and signal receiver terminals; an antenna cross branch including a resistor coupled to said antenna terminal and a transistor coupled to said resistor, to a potential source, and to a variable amplifier source; and a receiver cross branch including a second p-i-n diode coupling said receiver terminal to a positive potential source, said receiver cross branch including a resistor coupling said receiver terminal to circuit ground and said positive potential source is in the form of a voltage divider having a pair of resistors series connecting a potential source to a potential reference level.
Claim 4
Dependent Claim
112 words
An adjustable pi network form of attenuator comprising: a longitudinal branch including a first p-i-n diode interconnecting antenna and signal receiver terminals; an antenna cross branch including a resistor coupled to said antenna terminal and a transistor coupled to said resistor, to a potential source, and to a variable amplifier source; and a receiver cross branch including a second p-i-n diode coupling said receiver terminal to a positive potential source, said receiver cross branch including a resistor coupling said receiver terminal to circuit ground and said positive potential source is in the form of a voltage divider having a pair of resistors series connecting a potential source to a potential reference level.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |