US4079319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency signal distribution device for use in a CATV system
Assignee: US Philips Corp
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Filing: 1977-01-21
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Granted: 1978-03-14
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Expires: 1997-01-21
Abstract
Abstract Radio frequency signal distribution device for use in a distribution system for VHF and UHF signals, which device comprises an input terminal, an output terminal and a signal transmission line connected between the input terminal and the output terminal, which signal transmission line is provided with a plurality of directional couplers which are connected in series for the radio frequency signal on the signal transmission line, each directional coupler comprising a coupling loop as well as a tap-off terminal which is connected to the coupling loop, which coupling loop has an electrical length of a quarter of the wavelength of a frequency in the TV UHF range, which signal distribution device can supply signals to some dozens of subscribers within a radius of 80 to 100 m which signals satisfy the requirements imposed in practice as regards the signal level within given frequency bands.
Inventors
- 👤 Lodevicus Petrus M. Bracke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:03
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H03; H03H; H03H7/00; H03H7/48; H03H7/482; H04N7/10; H04N7/102; H04N7/104
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A radio frequency-signal distribution device for use in a distribution system for VHF and UHF signals, which device comprises an input terminal, an output terminal and a signal transmission line connected between the input terminal and the output terminal, which signal transmission line comprises a plurality of directional couplers connected in series for the radio frequency signal on the signal transmission line, each directional coupler comprising a coupling loop and a tap-off terminal connected to the coupling loop, which coupling loop has an electrical length of a quarter of the wavelength of a frequency in the standard TV UHF range, the electrical length of the coupling loops increasing in the direction from the input terminal towards the output terminal, and an attenuation filter included in the signal transmission line between the input terminal and the directional couplers, which attenuation filter has an attenuation for the frequencies between the standard TV VHF and the standard TV UHF range which is larger than the attenuation for the frequencies in these standard TV frequency ranges.
Claim 2
Dependent Claim
172 words
A radio frequency-signal distribution device for use in a distribution system for VHF and UHF signals, which device comprises an input terminal, an output terminal and a signal transmission line connected between the input terminal and the output terminal, which signal transmission line comprises a plurality of directional couplers connected in series for the radio frequency signal on the signal transmission line, each directional coupler comprising a coupling loop and a tap-off terminal connected to the coupling loop, which coupling loop has an electrical length of a quarter of the wavelength of a frequency in the standard TV UHF range, the electrical length of the coupling loops increasing in the direction from the input terminal towards the output terminal, and an attenuation filter included in the signal transmission line between the input terminal and the directional couplers, which attenuation filter has an attenuation for the frequencies between the standard TV VHF and the standard TV UHF range which is larger than the attenuation for the frequencies in these standard TV frequency ranges.
Claim 3
Dependent Claim
85 words
A signal distribution device as claimed in claim 1, wherein the attenuation filter comprises a series branch and a parallel branch, which series branch shunts a series arrangement of first and second substantially equal resistors, which series branch comprises a parallel circuit of a third resistor, a first capacitor and a first inductor, which parallel branch is connected to the common node of the first and the second resistor and comprises a series circuit of a fourth resistor, a second capacitor and a second inductor.
Claim 4
Dependent Claim
32 words
A signal distribution device as claimed in claim 2, wherein the third resistor has a resistance value which is one to six times as large as the resistance of the fourth resistor.
Claim 5
Dependent Claim
38 words
A signal distribution device as claimed in claim 1 wherein the electrical length of the coupling loops increases by approximately two to three percent between each two succeeding coupling loops from the input terminal towards the output terminal.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |