US4149123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attenuator
Assignee: Lockheed Martin Corp
•
Filing: 1978-06-30
•
Granted: 1979-04-10
•
Expires: 1998-06-30
Abstract
Abstract Attenuation of a signal is achieved by biphase modulating the signal with an asymmetrical duty factor rectangular wave. In one embodiment of the invention an input signal is applied to a phase reversal switch having as its second input thereto an asymmetrical duty factor rectangular wave.
Inventors
- 👤 Martin R. Richmond
- 👤 Alfred J. Cann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:23
CPC Classifications
H; H03; H03G; H03G3/00; H03C; H03C1/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
Apparatus for attenuating a signal within a particular bandwidth, comprising: a phase reversal switch having first and second inputs and an output; means for applying an input signal to said first input of said phase reversal switch; and means for applying an asymmetrical rectangular wave having a low frequency relative to said signal but greater than said bandwidth to the second input of said phase reversal switch such that said asymmetrical rectangular wave occasions phase reversal of the input signal causing a power reduction in the center line of the output spectrum at the frequency of the input signal and whereby variable attenuation can be achieved by varying the duty factor of the asymmetrical rectangular wave.
Claim 2
Dependent Claim
116 words
Apparatus for attenuating a signal within a particular bandwidth, comprising: a phase reversal switch having first and second inputs and an output; means for applying an input signal to said first input of said phase reversal switch; and means for applying an asymmetrical rectangular wave having a low frequency relative to said signal but greater than said bandwidth to the second input of said phase reversal switch such that said asymmetrical rectangular wave occasions phase reversal of the input signal causing a power reduction in the center line of the output spectrum at the frequency of the input signal and whereby variable attenuation can be achieved by varying the duty factor of the asymmetrical rectangular wave.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1, wherein said phase reversal switch is a balanced mixer.
Claim 4
Dependent Claim
15 words
Apparatus as defined in claim 1, wherein said phase reversal switch is a balanced modulator.
Claim 5
Dependent Claim
74 words
Apparatus for attenuating a signal within a particular bandwidth, comprising: a plurality of cascaded phase reversal switches; means for applying an input signal to said plurality of cascaded phase reversal switches; and means for applying rectangular waves to each of said phase reversal switches of a low frequency relative to said signal but greater than said bandwidth, the phase relationship of said rectangular waves being adjusted to control the attenuation of said input signal.
Claim 6
Dependent Claim
74 words
Apparatus for attenuating a signal within a particular bandwidth, comprising: a plurality of cascaded phase reversal switches; means for applying an input signal to said plurality of cascaded phase reversal switches; and means for applying rectangular waves to each of said phase reversal switches of a low frequency relative to said signal but greater than said bandwidth, the phase relationship of said rectangular waves being adjusted to control the attenuation of said input signal.
Claim 7
Dependent Claim
14 words
Apparatus as defined in claim 4, wherein said phase reversal switches are balanced mixers.
Claim 8
Dependent Claim
14 words
Apparatus as defined in claim 4, wherein said phase reversal switches are balanced modulators.
Claim 9
Independent Claim
61 words
A method of attenuating a signal within a particular bandwidth comprising the steps of: applying the signal to a phase reversal switching circuit; and changing the phase of the signal with an asymmetrical duty factor wave having a low frequency relative to said signal but greater than said bandwidth such that variable attenuation can be achieved by varying the duty factor.
Claim 10
Independent Claim
61 words
A method of attenuating a signal within a particular bandwidth comprising the steps of: applying the signal to a phase reversal switching circuit; and changing the phase of the signal with an asymmetrical duty factor wave having a low frequency relative to said signal but greater than said bandwidth such that variable attenuation can be achieved by varying the duty factor.
Claim 11
Dependent Claim
67 words
Apparatus for attenuating a signal within a particular bandwidth comprising: a plurality of cascaded phase reversal switches; means for applying an input signal to said plurality of cascaded phase reversal switches; and means for applying rectangular waves to each of said phase reversal switches of a low frequency relative to said signal but greater than said bandwidth, at least one of which has an asymmetrical duty factor.
Claim 12
Dependent Claim
67 words
Apparatus for attenuating a signal within a particular bandwidth comprising: a plurality of cascaded phase reversal switches; means for applying an input signal to said plurality of cascaded phase reversal switches; and means for applying rectangular waves to each of said phase reversal switches of a low frequency relative to said signal but greater than said bandwidth, at least one of which has an asymmetrical duty factor.
Claim 13
Dependent Claim
14 words
Apparatus as defined in claim 8, wherein said phase reversal switches are balanced mixers.
Claim 14
Dependent Claim
14 words
Apparatus as defined in claim 8, wherein said phase reversal switches are balanced modulators.
References Cited (Backward Citations)
US3363188A
Cited
US3201700A
Cited
US3181074A
Cited
US3351863A
Cited
US3260966A
Cited
US3348145A
Cited
US3973223A
Cited
US3624560A
Cited
US3662290A
Cited
US3898593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |