US4785305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-mountable antenna assembly with microstrip filter
Assignee: Individual
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Filing: 1987-04-20
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Granted: 1988-11-15
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Expires: 2007-04-20
Abstract
Abstract An antenna for mounting on a non-conductive surface such as a windshield of an automobile coupled by a capacitor to housing on the inside of the resonant plate. The antenna has a jack for receiving a plug from a car radio and provides for interchangeability of the cable between the radio receiver and the jack. The circuit allows for fine tuning to the resonant frequency of the antenna.
Inventors
- 👤 Don Shyu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/1271; H01Q1/1285
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
In a glass-mountable antenna assembly comprising an electrically-shortened antenna (1), an antenna base (3), an upper capacitor plate (2) capable of receiving an electromagnetic signal from said antenna (1) and transmitting said electromagnetic signal through a sheet of glass to a lower capacitor plate (5) on the opposite side of said sheet of glass, the improvement comprising: a metal wire (62) being electrically connected to said lower capacitor plate (5) on one end thereof; a microstrip filter (61) being electrically connected to said metal wire (62) and emulating an inductor; a variable capacitor (63) electrically interacting with said microstrip filter (61); a jack (8) which connects electrically with said microstrip filter (61) to receive a signal therefrom; and said housing (7) containing said microstrip filter (61), said metal wire (62), and said lower capacitor plate (5) and receiving a portion of said jack (8) therein.
Claim 2
Dependent Claim
145 words
In a glass-mountable antenna assembly comprising an electrically-shortened antenna (1), an antenna base (3), an upper capacitor plate (2) capable of receiving an electromagnetic signal from said antenna (1) and transmitting said electromagnetic signal through a sheet of glass to a lower capacitor plate (5) on the opposite side of said sheet of glass, the improvement comprising: a metal wire (62) being electrically connected to said lower capacitor plate (5) on one end thereof; a microstrip filter (61) being electrically connected to said metal wire (62) and emulating an inductor; a variable capacitor (63) electrically interacting with said microstrip filter (61); a jack (8) which connects electrically with said microstrip filter (61) to receive a signal therefrom; and said housing (7) containing said microstrip filter (61), said metal wire (62), and said lower capacitor plate (5) and receiving a portion of said jack (8) therein.
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |