Patent US3633103A successfully refreshed from Google Patents.
US3633103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave relay equipment
Assignee: NEC Corp
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Filing: 1970-07-22
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Granted: 1972-01-04
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Expires: 1990-07-22
Abstract
Abstract A microwave repeated in which only a single diplexing filter is employed and in which no dummy load element is required. The input terminal is connected directly to one port of a four-port directional coupler and a second port of the coupler is coupled directly to a receiving frequency converter.
Inventors
- 👤 Mineo Suglyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:17
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A microwave relay equipment comprising input means for receiving an incoming microwave signal, a four-port directional coupler having first, second third and fourth ports, with said first port coupled to said input means, means for providing a local oscillation signal coupled to said third port, a frequency converter coupled to said fourth port for receiving a portion of said local oscillation signal together with said incoming microwave signal and for down-converting the frequency of said incoming microwave signal, means coupled to said frequency converter for up-converting the frequency of the output of said frequency converter, diplexing filter means coupled to said second port and said up-converting mans for feeding said local oscillation to said up-converting means, and output means coupled to said diplexing filter means for deriving the up-converted output through said diplexing filter means.
Claim 2
Dependent Claim
135 words
A microwave relay equipment comprising input means for receiving an incoming microwave signal, a four-port directional coupler having first, second third and fourth ports, with said first port coupled to said input means, means for providing a local oscillation signal coupled to said third port, a frequency converter coupled to said fourth port for receiving a portion of said local oscillation signal together with said incoming microwave signal and for down-converting the frequency of said incoming microwave signal, means coupled to said frequency converter for up-converting the frequency of the output of said frequency converter, diplexing filter means coupled to said second port and said up-converting mans for feeding said local oscillation to said up-converting means, and output means coupled to said diplexing filter means for deriving the up-converted output through said diplexing filter means.
Claim 3
Dependent Claim
22 words
The microwave relay equipment of claim 1, further comprising amplifier means operatively interposed between said frequency converter and said frequency up-converting means.
Claim 4
Dependent Claim
55 words
The microwave relay equipment of claim 2, further comprising demodulating means coupled to the output of said amplifier means, modulating means coupled to the output of said demodulating means and having an output coupled to the input of said frequency up-converting means, and means for providing a second local oscillation signal to said modulating means.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |