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US5497137A Expired / Lapsed US ⏱️ 0.0 years remaining

Chip type transformer

Assignee: Murata Manufacturing Co Ltd
•
Filing: 1994-12-16
•
Granted: 1996-03-05
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Expires: 2014-12-16
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Abstract

Abstract A balun transformer (10) may be constructed as a chip type transformer including a laminate (12) having first through fifth dielectric substrates (14a), (14b), (14c), (14d), and (14e) to be superimposed one on the other. An earth electrode (16) is formed on one main surface of the first dielectric substrate (14a), and an earth electrode (30) is formed on one main surface of the fifth dielectric substrate (14e). A connecting electrode (20) is formed on one main surface of the second dielectric substrate (14b). A first strip line (22) is formed on one main surface of the third dielectric substrate (14c). The first strip line (22) consists of a first spiral portion (24a) and a second spiral portion (24b). A second spiral strip line (26) and a third spiral strip line (28) are formed on one main surface of the fourth dielectric substrate (14d). The second strip line (26) and the third strip line (28) are electromagnetically connected with the first portion (24a) of the first strip line (22) and the second portion (24b) thereof, respectively.

Inventors

  • 👤 Yasuhiro Fujiki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 11:10
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H03H7/422; H01; H01F; H01F17/00; H01F17/0006; H01P; H01P5/00; H01P5/08; H01P5/10; H01F2017/0066

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 113 words
A chip type transformer comprising: a first strip line having a first portion and a second portion; a second strip line with a shape corresponding to said first portion of said first strip line, which is opposite to said first portion with a dielectric substrate sandwiched therebetween; and a third strip line with a shape corresponding to said second portion of said first strip line, which is opposite to said second portion with said dielectric substrate sandwiched therebetween; said second and third strip lines being opposite to an earth electrode with another dielectric substrate sandwiched therebetween, one end of each of said second and third strip lines being connected to said earth electrode.
Claim 2
Dependent Claim 113 words
A chip type transformer comprising: a first strip line having a first portion and a second portion; a second strip line with a shape corresponding to said first portion of said first strip line, which is opposite to said first portion with a dielectric substrate sandwiched therebetween; and a third strip line with a shape corresponding to said second portion of said first strip line, which is opposite to said second portion with said dielectric substrate sandwiched therebetween; said second and third strip lines being opposite to an earth electrode with another dielectric substrate sandwiched therebetween, one end of each of said second and third strip lines being connected to said earth electrode.
Claim 3
Dependent Claim 52 words
A chip type transformer according to claim 1, wherein the length of the first portion of said first strip line is substantially equal to that of said second strip line; and the length of the second portion of said first strip line is substantially equal to that of said third strip line.
Claim 4
Dependent Claim 26 words
A chip type transformer according to claim 2, wherein the length of said second strip line is substantially equal to that of said third strip line.
Claim 5
Dependent Claim 26 words
A chip type transformer according to claim 2, wherein the length of said second strip line is substantially different from that of said third strip line.
Claim 6
Dependent Claim 27 words
A chip type transformer according to claim 1, wherein said first and second portions of said first strip line are formed in the shape of a spiral.
Claim 7
Dependent Claim 25 words
A chip type transformer according to claim 1, wherein said first and second portions of said first strip line are formed in a zigzag shape.

References Cited (Backward Citations)

US3002260A Cited
US4369557A Cited
US5034710A Cited
US5012571A Cited
US5039964A Cited
US5276421A Cited
US5381124A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1999-03-05 1999-09-04 2000-03-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2003-03-05 2003-09-04 2004-03-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2007-03-05 2007-09-04 2008-03-05 $7700.00 Window Closed / Lapsed

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