US5138288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micro strip filter having a varactor coupled between two microstrip line resonators
Assignee: Motorola Solutions Inc
•
Filing: 1991-03-27
•
Granted: 1992-08-11
•
Expires: 2011-03-27
Abstract
Abstract A transmission line filter is provided which includes a first resonator having open ends being coupled to a second resonator disposed on a substrate. A transmission zero frequency is tuned by means of a varactor which is coupled between the first and the second resonator. The first resonator includes a terminal for applying a control voltage to the varactor for varying its capacitance.
Inventors
- 👤 Dane E. Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:43
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20363
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
63 words
A transmission line filter comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets the voltage potential across said varactor, wherein said second resonator has at least one grounded end.
Claim 2
Dependent Claim
63 words
A transmission line filter comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets the voltage potential across said varactor, wherein said second resonator has at least one grounded end.
Claim 3
Dependent Claim
70 words
A transmission line filter comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets the voltage potential across said varactor, wherein said second resonator has open ends including a second terminal for receiving a second control voltage.
Claim 4
Dependent Claim
70 words
A transmission line filter comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets the voltage potential across said varactor, wherein said second resonator has open ends including a second terminal for receiving a second control voltage.
Claim 5
Dependent Claim
24 words
The transmission line filter of claim 1, wherein said first resonator includes pockets at at least one open end for substantially increasing capacitive loading.
Claim 6
Dependent Claim
80 words
A radio transceiver comprising: communication means for communicating communication signals; a transmission line filter for filtering signals within said communication means comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator, wherein said second resonator has at least one grounded end; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets a voltage potential across said varactor.
Claim 7
Dependent Claim
80 words
A radio transceiver comprising: communication means for communicating communication signals; a transmission line filter for filtering signals within said communication means comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator, wherein said second resonator has at least one grounded end; and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets a voltage potential across said varactor.
Claim 8
Dependent Claim
87 words
A radio transceiver comprising: communication means for communicating communication signals; a transmission line filter for filtering signals within said communication means comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator, and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets a voltage potential across said varactor, wherein said second resonator has open ends including a second terminal for receiving a second control voltage.
Claim 9
Dependent Claim
87 words
A radio transceiver comprising: communication means for communicating communication signals; a transmission line filter for filtering signals within said communication means comprising: a first resonator having open ends including a terminal for receiving a control voltage; a second resonator being coupled to said first resonator, and a varactor being coupled between said first resonator and said second resonator such that said control voltage sets a voltage potential across said varactor, wherein said second resonator has open ends including a second terminal for receiving a second control voltage.
Claim 10
Dependent Claim
22 words
The radio of claim 4, wherein said first resonator includes pockets at at least one open end for substantially increasing capacitive loading.
Claim 11
Dependent Claim
93 words
A transmission line structure comprising: a substrate having a ground plane disposed on a major bottom surface; a first conductive runner disposed on top surface of said substrate having open ends including a terminal for receiving a control voltage; a second conductive runner disposed on top surface of said substrate having a grounded end and an open end; and a varactor being coupled between one open end of said first conductive runner and the open end of said second conductive runner such that said control voltage sets the voltage potential across said varactor.
Claim 12
Dependent Claim
93 words
A transmission line structure comprising: a substrate having a ground plane disposed on a major bottom surface; a first conductive runner disposed on top surface of said substrate having open ends including a terminal for receiving a control voltage; a second conductive runner disposed on top surface of said substrate having a grounded end and an open end; and a varactor being coupled between one open end of said first conductive runner and the open end of said second conductive runner such that said control voltage sets the voltage potential across said varactor.
Claim 13
Dependent Claim
111 words
A transmission line structure comprising: a substrate having a ground plane disposed on a major bottom surface; a first conductive runner disposed on top surface of said substrate having open ends including a terminal for receiving a control voltage; a second conductive runner disposed on top surface of said substrate having a grounded end and an open end; and a varactor being coupled between one open end of said first conductive runner and the open end of said second conductive runner such that said control voltage sets the voltage potential across said varactor, wherein said second conductive runner has open ends including a second terminal for receiving a second control voltage.
Claim 14
Dependent Claim
111 words
A transmission line structure comprising: a substrate having a ground plane disposed on a major bottom surface; a first conductive runner disposed on top surface of said substrate having open ends including a terminal for receiving a control voltage; a second conductive runner disposed on top surface of said substrate having a grounded end and an open end; and a varactor being coupled between one open end of said first conductive runner and the open end of said second conductive runner such that said control voltage sets the voltage potential across said varactor, wherein said second conductive runner has open ends including a second terminal for receiving a second control voltage.
Claim 15
Dependent Claim
28 words
The transmission line structure of claim 7, wherein said substrate includes at least one pocket through which at least one of the first conductor or second conductor extends.
References Cited (Backward Citations)
US3534301A
Cited
US3798578A
Cited
US4121182A
Cited
US4157517A
Cited
US4418324A
Cited
US4661790A
Cited
US4731596A
Cited
US4609892A
Cited
US4799034A
Cited
US4785271A
Cited
US5021757A
Cited
US4940955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |