Patent US3768045A successfully refreshed from Google Patents.
US3768045A
Expired / Lapsed
US
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Wide range variable phase shifter
Assignee: Korea Institute of Science and Technology
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Filing: 1971-10-05
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Granted: 1973-10-23
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Expires: 1991-10-05
Abstract
Abstract A variable phase shifter having a substantially wide phase shift variation range is formed of more or less standard circuit elements such as inductors, capacitors, quadrature hybrids and variable capacitors (or varactor diodes), the circuit elements being connected to one another in a fashion particularly well adapted to ready fabrication.
Inventors
- 👤 S Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:17
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
A variable phase shifter, comprising: a 3 db hybrid circuit having an input port for receiving an input signal, a transmitted port for producing a signal in phase with the input signal, a coupled port for producing a signal 90* aheAd of the input signal, and an output port; first and second matched reactive reflecting networks connected to said transmitted and coupled ports, respectively, of said hybrid circuit, each of said reflecting networks comprising a resonant circuit including a voltage variable impedance element and a plurality of elements of fixed impedance, said elements having impedance values selected to provide a reactive impedance characteristic for each reflecting network varying in a domain in which its poles and zeros are interlaced as the impedance of each variable impedance element is varied; and means for varying the impedance of both variable impedance elements to obtain a phase shift signal at said output port of said hybrid circuit in response to the input signal.
Claim 2
Dependent Claim
160 words
A variable phase shifter, comprising: a 3 db hybrid circuit having an input port for receiving an input signal, a transmitted port for producing a signal in phase with the input signal, a coupled port for producing a signal 90* aheAd of the input signal, and an output port; first and second matched reactive reflecting networks connected to said transmitted and coupled ports, respectively, of said hybrid circuit, each of said reflecting networks comprising a resonant circuit including a voltage variable impedance element and a plurality of elements of fixed impedance, said elements having impedance values selected to provide a reactive impedance characteristic for each reflecting network varying in a domain in which its poles and zeros are interlaced as the impedance of each variable impedance element is varied; and means for varying the impedance of both variable impedance elements to obtain a phase shift signal at said output port of said hybrid circuit in response to the input signal.
Claim 3
Dependent Claim
62 words
The variable phase shifter of claim 1, wherein: each of said reflecting networks includes first and second series resonated reactive circuits connected in parallel; and said element of variable impedance comprises first and second varactor diodes in said first and second series resonated reactive circuits, respectively, said varactor diodes having variable capacitances determined by reverse bias voltages applied to said varactor diodes.
Claim 4
Dependent Claim
61 words
The variable phase shifter of claim 1, wherein: each of said reflecting networks includes first and second resonant circuits connected in series; and said element of variable impedance comprises first and second varactor diodes connected in parallel with said first and second resonant circuits, respectively, said varactor diodes having variable capacitances determined by reverse bias voltages applied to said varactor diodes.
Claim 5
Dependent Claim
25 words
The variable phase shifter of claim 3, wherein: each reflecting network includes a blocking capacitor connected in series with said first and second resonant circuits.
Claim 6
Dependent Claim
64 words
The variable phase shifter of claim 1, wherein: each of said reflecting networks includes a resonant circuit comprising a capacitor and inductor connected in series; and said element of variable impedance comprises a varactor diode in each reflecting network connected in parallel with the resonant circuit, said varactor diode having a variable capacitance determined by a reverse bias voltage applied to said varactor diode.
Claim 7
Dependent Claim
36 words
The variable phase shifter of claim 5, which includes: a pair of blocking capacitors for coupling the resonant circuits of said first and second reflecting networks to said transmitted and coupled ports of said hybrid circuit.
Claim 8
Dependent Claim
34 words
The variable phase shifter of claim 5, wherein said impedance varying means comprises: a control circuit for applying a variable reverse bias voltage to both varactor diodes to vary the capacitances of said diodes.
Claim 9
Dependent Claim
50 words
The variable phase shifter of claim 7, wherein said control circuit comprises: a potentiometer for producing a variable voltage output; and an RF choke for each varactor diode responsive to the output of said potentiometer for applying the variable voltage output to each varactor diode as a reverse bias voltage.
Claim 10
Dependent Claim
131 words
A variable phase shifter comprising: a circulator having an input port for receiving an input signal, an intermediate port to which the input signal is transferred, and an output port; a reactive reflecting network connected to said intermediate port of said circulator, said reflecting network comprising a resonant circuit including a voltage variable impedance element and a plurality of elements of fixed impedance, said elements having impedance values selected to provide a reactive impedance characteristic for said reflecting network varying in a domain in which its poles and zeros are interlaced as the impedance of said variable impedance element is varied; and means for varying the impedance of said variable impedance element to obtain a phase shift signal at said output port of said circulator in response to the input signal.
Claim 11
Dependent Claim
131 words
A variable phase shifter comprising: a circulator having an input port for receiving an input signal, an intermediate port to which the input signal is transferred, and an output port; a reactive reflecting network connected to said intermediate port of said circulator, said reflecting network comprising a resonant circuit including a voltage variable impedance element and a plurality of elements of fixed impedance, said elements having impedance values selected to provide a reactive impedance characteristic for said reflecting network varying in a domain in which its poles and zeros are interlaced as the impedance of said variable impedance element is varied; and means for varying the impedance of said variable impedance element to obtain a phase shift signal at said output port of said circulator in response to the input signal.
Claim 12
Dependent Claim
60 words
The variable phase shifter of claim 9, wherein: said reflecting network Includes first and second series resonated reactive circuits connected in parallel; and said element of variable impedance comprises first and second varactor diodes in said first and second series resonated reactive circuits, respectively, said varactor diodes having variable capacitances determined by reverse bias voltages applied to said varactor diodes.
Claim 13
Dependent Claim
58 words
The variable phase shifter of claim 9, wherein: said reflecting network includes a resonant circuit comprising a capacitor and inductor connected in series; and said element of variable impedance comprises a varactor diode connected in parallel with said resonant circuit, said varactor diode having a variable capacitance determined by a reverse bias voltage applied to said varactor diode.
Claim 14
Dependent Claim
24 words
The variable phase shifter of claim 11, which includes: a blocking capacitor for coupling said resonant circuit to the intermediate port of said circulator.
Claim 15
Dependent Claim
58 words
The variable phase shifter of claim 9, wherein: said reflecting network includes first and second resonant circuits connected in series; and said element of variable impedance comprises first and second varactor diodes connected in parallel with first and second resonant circuits, respectively, said varactor diodes having variable capacitances determined by reverse bias voltages applied to said varactor diodes.
Claim 16
Dependent Claim
25 words
The variable phase shifter of claim 13, wherein: said reflecting network includes a blocking capacitor connected in series with said first and second resonant circuits.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |