Patent US5204984A successfully refreshed from Google Patents.
US5204984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Down converter for satellite communication system
Assignee: Panasonic Holdings Corp
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Filing: 1991-11-05
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Granted: 1993-04-20
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Expires: 2011-11-05
Abstract
Abstract A down converter device is disclosed which is used in a satellite communication system to convert a microwave signal to an intermediate frequency signal by the use of a standard signal having a frequency range of several to several tens of MHz, and to apply the intermediate frequency signal to a next stage component. The down converter includes a mixer for producing the intermediate frequency signal indicative of a frequency difference between the standard signal and the microwave signal. A separator is provided which includes a first terminal for receiving the intermediate frequency signal, a second terminal for producing and supplying the intermediate frequency signal to the next stage component and for receiving the standard signal from the next stage component, a first filter for separating the standard signal, and a third terminal for producing the standard signal to the mixing means.
Inventors
- 👤 Hirotaka Fujisaki
- 👤 Yukiro Kashima
- 👤 Akihito Deki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:18
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H03; H03J; H03J7/00; H03J7/02; H03J7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A down converter for converting a microwave signal to an intermediate frequency signal by the use of a standard signal having a frequency range of several to several tens of MHz, and for applying said intermediate frequency signal to a next stage component, said down converter comprising: a mixing means for producing said intermediate frequency signal indicative of a frequency difference between said standard signal and said microwave signal; and a separator means comprising: a first terminal for receiving said intermediate frequency signal; a second terminal for producing and supplying said intermediate frequency signal to said next stage component and for receiving said standard signal from said next stage component; a first filter means for separating said standard signal from said intermediate frequency signal; and a third terminal for producing said standard signal to said mixing means.
Claim 2
Dependent Claim
137 words
A down converter for converting a microwave signal to an intermediate frequency signal by the use of a standard signal having a frequency range of several to several tens of MHz, and for applying said intermediate frequency signal to a next stage component, said down converter comprising: a mixing means for producing said intermediate frequency signal indicative of a frequency difference between said standard signal and said microwave signal; and a separator means comprising: a first terminal for receiving said intermediate frequency signal; a second terminal for producing and supplying said intermediate frequency signal to said next stage component and for receiving said standard signal from said next stage component; a first filter means for separating said standard signal from said intermediate frequency signal; and a third terminal for producing said standard signal to said mixing means.
Claim 3
Dependent Claim
45 words
A down converter as claimed in claim 1, wherein said second terminal further receives a DC current from said next stage, and wherein separator means further comprises a second filter means for separating said DC current, and a fourth terminal for producing said DC current.
Claim 4
Dependent Claim
19 words
A down converter as claimed in claim 2, further comprising a DC supply means connected to said fourth terminal.
Claim 5
Dependent Claim
36 words
A down converter as claimed in claim 1, wherein said second terminal is adapted for connection with a single line cable through which said intermediate frequency signal and said standard signal are transmitted in opposite directions.
Claim 6
Dependent Claim
43 words
A down converter as claimed in claim 2, wherein said second terminal is adapted for connection with a single line cable through which said intermediate frequency signal and a combined signal of said standard signal and DC current are transmitted in opposite directions.
Claim 7
Dependent Claim
30 words
A down converter as claimed in claim 1, wherein said mixing means comprises a phase synchronizing oscillation means for synchronizing said standard signal before being mixed with said microwave signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |