US4963773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pass/high pass filter phase shifter
Assignee: Hittite Microwave LLC
•
Filing: 1988-07-18
•
Granted: 1990-10-16
•
Expires: 2008-07-18
Abstract
Abstract A compact low pass/high pass filter phase shifter including a semiconductor switch having a control electrode and first and second load electrodes; a first inductance connected in series with one load electrode and second inductance connected in series with the other load electrode; a third inductance connected in parallel with one load electrode to ground and a fourth inductance connected in parallel with the other load electrode to ground; a capacitance connected in series between the control electrode and ground; and means for applying a control signal to the control electrode for switching the 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
- 👤 Yalcin Ayasli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:23
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03H; H03H7/00; H03H7/18; H03H7/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
A compact, low pass/high pass filter phase shifter circuit comprising: a semiconductor switch having a control electrode and first and second load electrodes; a first inductance connected in series with one load electrode, and a second inductance connected in series with the other load electrode; a third inductance connected in parallel with one load electrode to ground and a fourth inductance connected in parallel with the other load electrode to ground; a capacitance connected in series between said control electrode and ground; and means for applying a control signal to said control electrode for switching said 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
133 words
A compact, low pass/high pass filter phase shifter circuit comprising: a semiconductor switch having a control electrode and first and second load electrodes; a first inductance connected in series with one load electrode, and a second inductance connected in series with the other load electrode; a third inductance connected in parallel with one load electrode to ground and a fourth inductance connected in parallel with the other load electrode to ground; a capacitance connected in series between said control electrode and ground; and means for applying a control signal to said control electrode for switching said 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
31 words
The phase shifter circuit of claim 1 in which said semiconductor switch is an FET transistor, said control electrode is the gate and said load electrodes are the drain and source.
Claim 4
Dependent Claim
37 words
The phase shifter circuit of claim 1 in which the capacitance is in the range of 1 pF, the inductances are in the range of 1 nanoHenry and the FET has an approximately one millimeter gate periphery.
Claim 5
Dependent Claim
16 words
The phase shifter circuit of claim 1 in which said first and second inductances are equal.
Claim 6
Dependent Claim
16 words
The phase shifter circuit of claim 1 in which said third and fourth inductances are equal.
References Cited (Backward Citations)
US3179816A
Cited
US3665320A
Cited
US3716730A
Cited
US3882431A
Cited
US4220874A
Cited
US4158149A
Cited
US4176332A
Cited
US4701714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |