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Patent US4893035A successfully refreshed from Google Patents.
US4893035A
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Cascaded low pass/high pass filter phase shifter system
Assignee: Hittite Microwave LLC
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Filing: 1988-09-26
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Granted: 1990-01-09
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Expires: 2008-09-26
Abstract
Abstract A cascaded low pass/high pass filter phase shifter system including: a series of semiconductor switches each having a control electrode and first and second load electrodes; a capacitance connected in series between each control electrode and ground; an inductance connected in series between each second load electrode of one semiconductor switch and the first load electrode of the adjacent semiconductor switch in the series; and means for selectively applying a control signal to each said control electrode for switching the associated semiconductor switch between a first state in which it operates as a low pass filter and a second state in which it operates as a high pass filter to introduce a phase shift in a propagated signal.
Inventors
- 👤 Leonard D. Reynolds
- 👤 Yalcin Ayasli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:15
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A cascaded low pass/high pass filter phase shifter system comprising: a series of semiconductor switches each having a control electrode and first and second load electrodes; a capacitance connected in series between each said control electrode and ground; an inductance connected in series between each second load electrode of one semiconductor switch and the first load electrode of the adjacent semiconductor switch in the series; means for selectively applying a control signal to each said control electrode for switching the associated semiconductor switch between a first state in which it operates as a low pass filter and a second state in which it operates as a high pass filter to introduce a phase shift in a propagated signal.
Claim 2
Dependent Claim
118 words
A cascaded low pass/high pass filter phase shifter system comprising: a series of semiconductor switches each having a control electrode and first and second load electrodes; a capacitance connected in series between each said control electrode and ground; an inductance connected in series between each second load electrode of one semiconductor switch and the first load electrode of the adjacent semiconductor switch in the series; means for selectively applying a control signal to each said control electrode for switching the associated semiconductor switch between a first state in which it operates as a low pass filter and a second state in which it operates as a high pass filter to introduce a phase shift in a propagated signal.
Claim 3
Dependent Claim
16 words
The system of claim 1 further including a capacitance connected between each load electrode and ground.
Claim 4
Dependent Claim
15 words
The system of claim 1 further including an impedance shunt connected between said load electrodes.
Claim 5
Dependent Claim
18 words
The system of claim 3 in which said impedance shunt includes a resistance and capacitance connected in series.
Claim 6
Dependent Claim
123 words
A cascaded low pass/high pass filter phase shifter system comprising: a series of semiconductor switches each having a control electrode and first and second load electrodes; a capacitance connected in series between each said control electrode and ground; an inductance connected in parallel from the junction between the second load electrode of one semiconductor switch and the first load electrode of an adjacent semiconductor switch in the series to ground; means for selectively applying a control signal to each said control electrode for switching the associated semiconductor switch between a first state in which it operates as a low pass filter and a second state in which it operates as a high pass filter to introduce a phase shift in a propagated signal.
Claim 7
Dependent Claim
123 words
A cascaded low pass/high pass filter phase shifter system comprising: a series of semiconductor switches each having a control electrode and first and second load electrodes; a capacitance connected in series between each said control electrode and ground; an inductance connected in parallel from the junction between the second load electrode of one semiconductor switch and the first load electrode of an adjacent semiconductor switch in the series to ground; means for selectively applying a control signal to each said control electrode for switching the associated semiconductor switch between a first state in which it operates as a low pass filter and a second state in which it operates as a high pass filter to introduce a phase shift in a propagated signal.
Claim 8
Dependent Claim
16 words
The system of claim 5 further including a capacitance connected between each load electrode and ground.
Claim 9
Dependent Claim
15 words
The system of claim 5 further including an impedance shunt connected between said load electrodes.
Claim 10
Dependent Claim
18 words
The system of claim 7 in which said impedance shunt includes a resistance and capacitance connected in series.
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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |