US5296823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband transmission line balun
Assignee: Individual
•
Filing: 1992-09-04
•
Granted: 1994-03-22
•
Expires: 2012-09-04
Abstract
Abstract A wideband transmission line balun divides an input signal equally between a single-conductor transmission line and a polarity reversing, two-conductor transmission line thereby providing balanced signals at the transmission line outputs. Simple printed circuit and shielded structures include a ferrite core interactive with the two-conductor transmission line for parasitic mode suppression.
Inventors
- 👤 James Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:29
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A balun for converting between unbalanced and balanced signals and comprising: (a) a first transmission line having an input and an output; (b) a second transmission line having an input and an output; (c) coupling means for dividing a power signal equally between said first transmission line input and said second transmission line input; (d) said first transmission line and said second transmission line having substantially equal electrical lengths between said respective input and output; (e) said first transmission line having a single electrical conductor; (f) said second transmission line having a polarity reversing connection; and (g) said balanced signals being taken at said first transmission line output and said second transmission line output.
Claim 2
Dependent Claim
114 words
A balun for converting between unbalanced and balanced signals and comprising: (a) a first transmission line having an input and an output; (b) a second transmission line having an input and an output; (c) coupling means for dividing a power signal equally between said first transmission line input and said second transmission line input; (d) said first transmission line and said second transmission line having substantially equal electrical lengths between said respective input and output; (e) said first transmission line having a single electrical conductor; (f) said second transmission line having a polarity reversing connection; and (g) said balanced signals being taken at said first transmission line output and said second transmission line output.
Claim 3
Dependent Claim
21 words
A balun according to claim 1, further including ferrite means for suppressing parasitic transmission modes associated with said second transmission line.
Claim 4
Dependent Claim
17 words
A balun according to claim 1 wherein said second transmission line is wound in a coil configuration.
Claim 5
Dependent Claim
16 words
A balun according to claim 1 wherein said second transmission line is substantially one-quarter wavelength long.
Claim 6
Dependent Claim
33 words
A balun according to claim 1 wherein said coupling means comprises a parallel connection having said input of said first transmission line connected in parallel with said input of said second transmission line.
Claim 7
Dependent Claim
33 words
A balun according to claim 1 wherein said coupling means comprises a series connection having said input of said first transmission line connected in series with said input of said second transmission line.
Claim 8
Dependent Claim
34 words
A balun according to claim 1 wherein said first and said second transmission lines have characteristic impedance substantially 2Z 0 for matching an unbalanced impedance Z 0 to a balanced impedance 4Z 0 .
Claim 9
Dependent Claim
35 words
A balun according to claim 1 wherein said first and said second transmission lines have characteristic impedance substantially Z 0 /2 for matching an unbalanced impedance Z 0 to a balanced impedance Z 0 .
Claim 10
Dependent Claim
23 words
A balun according to claim 1 wherein said first and said second transmission lines provide impedance transformation between said respective input and output.
Claim 11
Dependent Claim
52 words
A balun according to claim 1, further including, (a) a dielectric substrate having first and second opposed, substantially parallel surfaces; (b) said second surface of said dielectric substrate having a planar signal ground conductor disposed thereon; and (c) said first surface of said dielectric substrate having said first transmission line disposed thereon.
Claim 12
Dependent Claim
57 words
A balun according to claim 1, further including: (a) a dielectric substrate having first and second opposed, substantially parallel surfaces; (b) said second surface of said dielectric substrate having a planar signal ground conductor disposed thereon; and (c) said first transmission line and said second transmission line being located next to opposite surfaces of said dielectric substrate.
Claim 13
Dependent Claim
19 words
A balun according to claim 1, further comprising conductive shielding means for preventing external electrical coupling to said balun.
Claim 14
Dependent Claim
22 words
A balun according to claim 12 wherein said first transmission line is placed next to an inner surface of said shielding means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |