Patent US4123712A successfully refreshed from Google Patents.
US4123712A
Expired / Lapsed
US
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Symmetrical polyphase network
Assignee: Nortel Networks Ltd
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Filing: 1977-04-22
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Granted: 1978-10-31
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Expires: 1997-04-22
Abstract
Abstract A symmetrical polyphase R-C network, in which each section has a resistor serially connected between its input and output and a capacitor connected between the input of one section and the output of an adjacent section, has a second resistor connected in shunt with the output of each section to decrease the passband ripple of the network with negligible effect on the stopband response.
Inventors
- 👤 Wasfy B. Mikhael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:03
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/60; H03D; H03D1/00; H03D1/22; H03D1/24; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/22; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04B1/302
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
In a symmetrical polyphase network having a plurality of symmetrical sections each comprising: an input and an output; a first impedance having one phase angle, connected between the input and output of an associated one of said sections, a second impedance having a different phase angle, connected between the input of said associated one section and the output of a different section; the improvement comprising: a third impedance in each of said sections connected in shunt with said output to decrease the passband ripple with negligible effect on the stopband response of the network.
Claim 2
Dependent Claim
94 words
In a symmetrical polyphase network having a plurality of symmetrical sections each comprising: an input and an output; a first impedance having one phase angle, connected between the input and output of an associated one of said sections, a second impedance having a different phase angle, connected between the input of said associated one section and the output of a different section; the improvement comprising: a third impedance in each of said sections connected in shunt with said output to decrease the passband ripple with negligible effect on the stopband response of the network.
Claim 3
Dependent Claim
31 words
A network as defined in claim 1 in which in each section: the first impedance is a resistor, the second impedance is a capacitor and the third impedance is a resistor.
Claim 4
Dependent Claim
21 words
A network as defined in claim 1 in which each of the third impedances is connected between a pair of outputs.
Claim 5
Dependent Claim
23 words
A network as defined in claim 1 in which each of the third impedances is connected between an output and a common terminal.
Claim 6
Dependent Claim
21 words
A network as defined in claim 1 in which signals applied to adjacent sections of the network are adjacent in phase.
Claim 7
Dependent Claim
52 words
A network as defined in claim 1 for use in a single sideband demodulator additionally comprising: means for modulating a single sideband modulated signal with a symmetrical polyphase carrier signal, the modulated outputs of which are applied to each input of the network; and means for summing the outputs of the network.
Claim 8
Dependent Claim
55 words
A network as defined in claim 1 for use in a single sideband modulator which additionally includes means for applying a symmetrical polyphase modulating signal to said inputs; means for modulating each of said outputs with a symmetrical polyphase carrier signal; and means for summing the modulated signals to produce a single sideband modulated signal.
Claim 9
Dependent Claim
28 words
A network as defined in claim 7 in which each input has a fourth resistor connected in series therewith to isolate the inputs and outputs from each other.
References Cited (Backward Citations)
US3559042A
Cited
US3618133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |