Patent US5477204A successfully refreshed from Google Patents.
US5477204A
Expired / Lapsed
US
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Radio frequency transformer
Assignee: Motorola Solutions Inc
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Filing: 1994-07-05
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Granted: 1995-12-19
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Expires: 2014-07-05
Abstract
Abstract A transformer (100)includes a substrate (101) on which two substantially adjacent runners (124 and 126) are disposed. The two runners (124 and 126) have substantially the same width and the same length and run from one segment of the substrate to another forming two spirals. The spirals run in opposite directions thereby capturing the flux and preventing it from escaping from the substrate hence adding to the efficiency of the electromagnetic coupling. The insertion loss of the transformer (100) is minimized by the high dielectric constant of the substrate, the close proximity of the two runners (124 and 126), and the opposite direction of the two loops.
Inventors
- 👤 Richard C. Li
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:54
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/0006; H01F19/00; H01F19/04; H01F19/08; H03; H03F; H03F1/00; H03F1/56; H03F1/565; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/48; H01F2017/0046
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A transformer having an insertion loss, comprising: a substantially flat substrate of electrically insulating material having a major surface; first and second substantially adjacent runners disposed on the major surface, each runner forms a coil of the transformer and includes first and second terminals, the runners are looped to substantially form a first intertwined spiral on a first segment of the major surface and a second intertwined spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss; an input port coupled to the first and second terminals of the first runner; and an output port coupled to the first and second terminals of the second runner.
Claim 2
Dependent Claim
120 words
A transformer having an insertion loss, comprising: a substantially flat substrate of electrically insulating material having a major surface; first and second substantially adjacent runners disposed on the major surface, each runner forms a coil of the transformer and includes first and second terminals, the runners are looped to substantially form a first intertwined spiral on a first segment of the major surface and a second intertwined spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss; an input port coupled to the first and second terminals of the first runner; and an output port coupled to the first and second terminals of the second runner.
Claim 3
Dependent Claim
12 words
The transformer of claim 1, wherein the runners include substantially flat runners.
Claim 4
Dependent Claim
12 words
The transformer of claim 1, further including a substantially plated second surface.
Claim 5
Dependent Claim
14 words
The transformer of claim 1, wherein the runners include runners having substantially similar lengths.
Claim 6
Dependent Claim
21 words
The transformer of claim 4, wherein the lengths of the runners is substantially 1/2 the wavelength of a desired operating frequency.
Claim 7
Dependent Claim
14 words
The transformer of claim 1, wherein the runners include runners having substantially similar widths.
Claim 8
Dependent Claim
14 words
The transformer of claim 1, wherein the first and second spirals include rectangular spirals.
Claim 9
Dependent Claim
76 words
A double-line radio frequency balun transformer, comprising: a substantially flat dielectric substrate having a top and a bottom surface; a plurality of adjacent runners disposed on the top surface of the dielectric substrate to form a plurality of intertwined spirals looped in .opposite directions each runner includes first and second ends; an input terminal coupled to the first end of the adjacent runners; and an output terminal coupled to the second end of the adjacent runners.
Claim 10
Dependent Claim
76 words
A double-line radio frequency balun transformer, comprising: a substantially flat dielectric substrate having a top and a bottom surface; a plurality of adjacent runners disposed on the top surface of the dielectric substrate to form a plurality of intertwined spirals looped in .opposite directions each runner includes first and second ends; an input terminal coupled to the first end of the adjacent runners; and an output terminal coupled to the second end of the adjacent runners.
Claim 11
Dependent Claim
26 words
The transformer of claim 8, further including a center tap coupled to one of the runners at a point between the first and the second terminals.
Claim 12
Dependent Claim
14 words
The transformer of claim 8, wherein the second surface includes a substantially plated surface.
Claim 13
Dependent Claim
12 words
The transformer of claim 8, wherein the runners include substantially flat runners.
Claim 14
Dependent Claim
14 words
The transformer of claim 8, wherein the runners include runners having substantially similar lengths.
Claim 15
Dependent Claim
21 words
The transformer of claim 12, wherein the lengths of the runners is substantially 1/2 the wavelength of a desired operating frequency.
Claim 16
Dependent Claim
14 words
The transformer of claim 8, wherein the runners include runners having substantially similar widths.
Claim 17
Dependent Claim
14 words
The transformer of claim 8, wherein the plurality of adjacent runners include rectangular spirals.
Claim 18
Dependent Claim
117 words
A radio communication device, comprising: an antenna; a transmitter for transmitting a radio frequency signal and including an amplifier, the amplifier including a transformer for coupling an amplified signal to the antenna, the transformer having an insertion loss and comprising: a substantially flat substrate of electrically insulating material having a major surface; and at least two substantially adjacent runners disposed on the first major surface, each runner having first and second terminals, the runners are looped to substantially form a first spiral on a first segment of the major surface and a second spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss.
Claim 19
Dependent Claim
117 words
A radio communication device, comprising: an antenna; a transmitter for transmitting a radio frequency signal and including an amplifier, the amplifier including a transformer for coupling an amplified signal to the antenna, the transformer having an insertion loss and comprising: a substantially flat substrate of electrically insulating material having a major surface; and at least two substantially adjacent runners disposed on the first major surface, each runner having first and second terminals, the runners are looped to substantially form a first spiral on a first segment of the major surface and a second spiral on a second segment of the major surface, the first and second spirals are looped in opposite directions to minimize the insertion loss.
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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) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |