US3824599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tv/fm/am antenna coupler
Assignee: Barker Manufacturing Co Inc
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Filing: 1972-12-13
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Granted: 1974-07-16
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Expires: 1992-12-13
Abstract
Abstract An antenna system using a standard dipole antenna capable of receiving television, AM and FM signals employing signal isolation means wherein the antenna may be automatically used to receive AM, FM and television signals without adjustment or control. A coaxial cable is employed from the antenna coupler to the AM/FM radio receiver, and a coaxial cable stub is disposed adjacent the radio antenna lead-in and is of a length equal to substantially 1/4 of a wavelength in the FM band, the shields of the antenna lead-in and the coaxial stub being electrically connected, and the inner conductors being connected to the dipole antenna such that the stub coaxial cable functions as a ''''short circuit'''' providing correct coupling to the dipole antenna when receiving FM signals, but does not interfere with AM signal reception.
Inventors
- 👤 C Haswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:21
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/46; H03H7/466
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
An antenna system for receiving television, AM and FM signals comprising, in combination, a dipole antenna receiving AM and FM signals and having first and second output conductors, a first coaxial cable having first and second ends and having a first inner conductor encased within and electrically insulated from a first electrical conducting tubular shield, said first inner conductor having said first end electrically connected to said first output conductor and said second end connectible to an AM/FM radio receiver, a second coaxial cable having first and second ends and having a second inner conductor encased within and electrically insulated from a second electrical conducting tubular shield, said second inner conductor having said first end electrically connected to said second output conductor, said second coaxial cable being of such length as to terminate at approximately maxiumum FM signal magnitude, said first and second shields bEing electrically interconnected and disposed in close proximity to each other in substantially parallel relation, said first ends of said cables being disposed adjacent each other, said first and second inner conductors being electrically insulated from each other and from said interconnected shields.
Claim 2
Dependent Claim
187 words
An antenna system for receiving television, AM and FM signals comprising, in combination, a dipole antenna receiving AM and FM signals and having first and second output conductors, a first coaxial cable having first and second ends and having a first inner conductor encased within and electrically insulated from a first electrical conducting tubular shield, said first inner conductor having said first end electrically connected to said first output conductor and said second end connectible to an AM/FM radio receiver, a second coaxial cable having first and second ends and having a second inner conductor encased within and electrically insulated from a second electrical conducting tubular shield, said second inner conductor having said first end electrically connected to said second output conductor, said second coaxial cable being of such length as to terminate at approximately maxiumum FM signal magnitude, said first and second shields bEing electrically interconnected and disposed in close proximity to each other in substantially parallel relation, said first ends of said cables being disposed adjacent each other, said first and second inner conductors being electrically insulated from each other and from said interconnected shields.
Claim 3
Dependent Claim
77 words
In an antenna system as in claim 1, first and second pairs of television signal lead conductors, each pair including a first conductor and a second conductor, said first and second conductors, respectively, of said leads being interconnected, said first conductor leads being connected to one of said output conductors and said second conductor leads being connected to the other of said output conductors, and signal isolation means interposed between said leads and the associated output conductor.
Claim 4
Dependent Claim
30 words
In an antenna system as in claim 1 wherein said second coaxial cable is of a length approximately one quarter of the wavelength of the FM signals to be received.
Claim 5
Dependent Claim
22 words
In an antenna system as in claim 3 wherein said second coaxial cable length is one quarter wavelength at approximately 100 Mhz.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |