US4570134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact hybrid providing quadrature phase relation between two outputs
Assignee: SPX Technologies Inc
•
Filing: 1984-04-19
•
Granted: 1986-02-11
•
Expires: 2004-04-19
Abstract
Abstract A hybrid uses stubs to provide 90 degrees of phase shift between output lines for feeding a circularly polarized antenna. Capacitive and inductive stubs have low and high characteristic impedances for broad bandwidth. The stubs can be located in the output lines for compactness, or in a T-section between an input line and the output lines, for compactness, to minimize undesired phase shift, and for ease of connection. The hybrid can include one quarter wave transformers having a characteristic impedance of geometric mean of the hybrid and antenna for improved axial ratio.
Inventors
- 👤 Oakley M. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
126 words
Apparatus comprising: an input coaxial transmission line having a first characteristic impedance; a pair of output coaxial transmission line for coupling signals to a pair of loads, respectively; first and second coaxial stubs coupled between said output lines, respectively, and said input line, said first and second stubs providing capacitive and inductive reactances, respectively, and having lower and higher characteristic impedances, respectively, than said first characteristic impedance in that the ratio of the outer diameter of the inner conductor to the inner diameter of the outer conductor for said first stub is larger than that same ratio for said second stub, to form a broad band hybrid for providing signals having a quadrature phase relation with respect to each other to said output coaxial transmission lines.
Claim 2
Dependent Claim
126 words
Apparatus comprising: an input coaxial transmission line having a first characteristic impedance; a pair of output coaxial transmission line for coupling signals to a pair of loads, respectively; first and second coaxial stubs coupled between said output lines, respectively, and said input line, said first and second stubs providing capacitive and inductive reactances, respectively, and having lower and higher characteristic impedances, respectively, than said first characteristic impedance in that the ratio of the outer diameter of the inner conductor to the inner diameter of the outer conductor for said first stub is larger than that same ratio for said second stub, to form a broad band hybrid for providing signals having a quadrature phase relation with respect to each other to said output coaxial transmission lines.
Claim 3
Dependent Claim
20 words
Apparatus as claimed in claim 1, wherein said output transmission lines extend in opposite directions with respect to each other.
Claim 4
Dependent Claim
14 words
Apparatus as claimed in claim 1, wherein said output transmission lines are substantially parallel.
Claim 5
Dependent Claim
27 words
Apparatus as claimed in claim 1, wherein each of said output transmission lines comprises a hollow inner conductor, said stubs being respectively disposed in said inner conductors.
Claim 6
Dependent Claim
19 words
Apparatus as claimed in claim 4, wherein said stubs respectively comprise said hollow conductors as the outer conductor thereof.
Claim 7
Dependent Claim
42 words
Apparatus as claimed in claim 1, wherein said input transmission line comprises a hollow inner conductor, said second stub being disposed within said hollow inner conductor; and said first stub being disposed between said inner conductor and one of said output lines.
Claim 8
Dependent Claim
20 words
Apparatus as claimed in claim 6, wherein said second stub comprises said hollow inner conductor as the outer conductor thereof.
Claim 9
Dependent Claim
37 words
Apparatus as claimed in claim 1, wherein: said loads each have a second characteristic impedance; and said output lines have a third characteristic impedance substantially equal to the geometric mean of said first and second characteristic impedances.
Claim 10
Dependent Claim
113 words
Apparatus comprising: an input coaxial transmission line having a hollow inner conductor and a first characteristic impedance; a pair of parallel output coaxial transmission lines for coupling signals to a pair of loads respectively; and first and second stubs coupled between said output lines, respectively, and said inner conductor of said input line and providing capacitive and inductive reactance, respectively, said first stub being disposed between said inner conductor of said input line and one of said output lines, said second stub being disposed within said hollow inner conductor of said input line, said stubs coupling signals having a quadrature phase relationship with respect to each other to said output coaxial transmission lines.
Claim 11
Dependent Claim
113 words
Apparatus comprising: an input coaxial transmission line having a hollow inner conductor and a first characteristic impedance; a pair of parallel output coaxial transmission lines for coupling signals to a pair of loads respectively; and first and second stubs coupled between said output lines, respectively, and said inner conductor of said input line and providing capacitive and inductive reactance, respectively, said first stub being disposed between said inner conductor of said input line and one of said output lines, said second stub being disposed within said hollow inner conductor of said input line, said stubs coupling signals having a quadrature phase relationship with respect to each other to said output coaxial transmission lines.
Claim 12
Dependent Claim
20 words
Apparatus as claimed in claim 9, wherein said second stub comprises said hollow inner conductor as the outer conductor thereof.
Claim 13
Dependent Claim
37 words
Apparatus as claimed in claim 9, wherein said loads each have a second characteristic impedance; and said output lines have a third characteristic impedance substantially equal to the geometric means of said first and second characteristic impedances.
Claim 14
Dependent Claim
104 words
Apparatus comprising: a hybrid having a pair of coaxial stubs for providing signals having a quadrature phase shift with respect to each other, via outputs thereof to a pair of loads, respectively, said stubs having a reactance characterized by the ratio of the outer diameter of the inner conductor to the inner diameter of the outer conductor for one stub being larger than that same ratio for the other stub, said loads having a resistance; and a pair of matching lines coupled between said outputs and said loads, respectively, and having an impedance of substantially the geometric mean of said resistance and said reactance.
Claim 15
Dependent Claim
104 words
Apparatus comprising: a hybrid having a pair of coaxial stubs for providing signals having a quadrature phase shift with respect to each other, via outputs thereof to a pair of loads, respectively, said stubs having a reactance characterized by the ratio of the outer diameter of the inner conductor to the inner diameter of the outer conductor for one stub being larger than that same ratio for the other stub, said loads having a resistance; and a pair of matching lines coupled between said outputs and said loads, respectively, and having an impedance of substantially the geometric mean of said resistance and said reactance.
Claim 16
Dependent Claim
29 words
Apparatus as claimed in claim 12, wherein said matching lines have an electrical length of one quarter of a wavelength at a selected frequency or an odd multiple thereof.
References Cited (Backward Citations)
US2667619A
Cited
US2510064A
Cited
US2633531A
Cited
US2897456A
Cited
US4127831A
Cited
US4367445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |