US4195271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad-band 180° phase shifter
Assignee: US Philips Corp
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Filing: 1977-11-14
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Granted: 1980-03-25
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Expires: 1997-11-14
Abstract
Abstract Disclosed is a 180° phase shifter having meander-shaped coupled lines in a predominantly planar form, such as, for example, microstrip, microslot or stripline, formed by a λ/2 long meander disposed opposite to a λ/4 long meander.
Inventors
- 👤 Burkhard Schiek
- 👤 Jurgen Kohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:14
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/185; H01P1/184
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A 180° phase shifter for use in planar microwave circuits such as microstrip, microslot, striplines and the like, said phase shifter comprising a first transmission line having a λ/2 long meander formed by a pair of coupled lines connected at one end and a reference transmission line having a λ/4 long meander formed by a pair of coupled lines connected at one end disposed opposite said λ/2 long meander so that the phase of a signal applied to said first transmission line is shifted by approximately 180° with respect to the phase of a signal applied to said reference transmission line.
Claim 2
Dependent Claim
101 words
A 180° phase shifter for use in planar microwave circuits such as microstrip, microslot, striplines and the like, said phase shifter comprising a first transmission line having a λ/2 long meander formed by a pair of coupled lines connected at one end and a reference transmission line having a λ/4 long meander formed by a pair of coupled lines connected at one end disposed opposite said λ/2 long meander so that the phase of a signal applied to said first transmission line is shifted by approximately 180° with respect to the phase of a signal applied to said reference transmission line.
Claim 3
Dependent Claim
22 words
A phase shifter according to claim 1, wherein said λ/2 long meander is formed by two λ/4 long sections of different impedances.
Claim 4
Dependent Claim
22 words
A phase shifter according to claim 1, wherein said λ/2 and λ/4 meanders each include a plurality of sections having different impedances.
Claim 5
Dependent Claim
108 words
A 180° phase shifter for use in planar microwave circuits such as microstrip, microslot, striplines and the like, said phase shifter comprising a first transmission line having a first (n+1) λ/4 long meander formed by a pair of coupled lines connected at one end and a second transmission line having a n λ/4 long meander formed by a pair of coupled lines connected at one end disposed opposite said first meander, where n is an interger, so that the phase of a signal applied to said first transmission line is shifted by approximately 180° with respect to the phase of a signal applied to said reference transmission line.
Claim 6
Dependent Claim
108 words
A 180° phase shifter for use in planar microwave circuits such as microstrip, microslot, striplines and the like, said phase shifter comprising a first transmission line having a first (n+1) λ/4 long meander formed by a pair of coupled lines connected at one end and a second transmission line having a n λ/4 long meander formed by a pair of coupled lines connected at one end disposed opposite said first meander, where n is an interger, so that the phase of a signal applied to said first transmission line is shifted by approximately 180° with respect to the phase of a signal applied to said reference transmission line.
References Cited (Backward Citations)
DE2460695A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |