US5424694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature directional coupler
Assignee: Honeywell International Inc
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Filing: 1994-06-30
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Granted: 1995-06-13
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Expires: 2014-06-30
Abstract
Abstract A miniature directional coupler has short coupled lines, a series inductor and a parallel resistor connected to the second coupled line output. The coupled lines have a length considerably less than one quarter of a wavelength. Values of the series inductor and the parallel resistor are dependent on coupling, frequency, directivity, impedance and coupling flatness.
Inventors
- 👤 Leo Maloratsky
- 👤 John Ide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:59
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/184; H01P5/185
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
81 words
A miniature directional coupler comprising: a first coupled line having an input and an output; a second coupled line having an input and an output and separated from said first coupled line by a gap; series resistor means connected between ground and said input of said second coupled line; series inductor means connected between said output of said second coupled line and an output of said miniature directional coupler, and; parallel resistor means connected between said series inductor means and ground.
Claim 2
Dependent Claim
81 words
A miniature directional coupler comprising: a first coupled line having an input and an output; a second coupled line having an input and an output and separated from said first coupled line by a gap; series resistor means connected between ground and said input of said second coupled line; series inductor means connected between said output of said second coupled line and an output of said miniature directional coupler, and; parallel resistor means connected between said series inductor means and ground.
Claim 3
Dependent Claim
37 words
A miniature directional coupler as claimed in claim 1 wherein said first coupled line and said second coupled line have a length of less than Λ o /4 where Λ o is center wavelength in coupled lines.
Claim 4
Dependent Claim
31 words
A miniature directional coupler as claimed in claim 2 wherein said first coupled line and said second coupled line have a length dependent on center frequency, insertion loss, coupling and directivity.
Claim 5
Dependent Claim
25 words
A miniature directional coupler as claimed in claim 3 wherein said first coupled line and said second coupled line have a length that are equal.
Claim 6
Dependent Claim
26 words
A miniature directional coupler as claimed in claim 4 wherein said series resistor means has a resistance value equal to impedance of said second coupled line.
Claim 7
Dependent Claim
27 words
A miniature directional coupler as claimed in claim 5 wherein said series inductor means has an inductance value dependent on coupling flatness, center frequency and coupling value.
Claim 8
Dependent Claim
34 words
A miniature directional coupler as claimed in claim 6 wherein said parallel resistor means has a resistance value dependent on impedance of said second coupled line and said value of said series inductor means.
Claim 9
Dependent Claim
28 words
A miniature directional coupler as claimed in claim 7 wherein tuning of the center frequency and coupling is realized by varying the value of said series inductor means.
Claim 10
Dependent Claim
56 words
A miniature directional coupler as claimed in claim 1 wherein said first coupled line length and said second coupled line length is equal to approximately Λ o /20 where Λ o is the center wavelength in said coupled lines and said parallel resistor means comprises a resistor equal to the impedance of said second coupled line.
Claim 11
Dependent Claim
131 words
A miniature directional coupler comprising: a first minimum coupling flatness coupler comprised of a first coupled line having an input and an output and a second coupled line separated by a gap, said second coupled line having an input and an output; a second high directivity directional coupler comprised of said second coupled line and a third coupled line separated by a gap, said third coupled line having an input and an output; first resistor means connected between said input of said first coupled line and ground; second resistor means connected between said input of said third coupled line and ground; inductor means connected between said output of said third coupled line and an output of said miniature directional coupler; and, third resistor means connected between said inductor means and ground.
Claim 12
Dependent Claim
131 words
A miniature directional coupler comprising: a first minimum coupling flatness coupler comprised of a first coupled line having an input and an output and a second coupled line separated by a gap, said second coupled line having an input and an output; a second high directivity directional coupler comprised of said second coupled line and a third coupled line separated by a gap, said third coupled line having an input and an output; first resistor means connected between said input of said first coupled line and ground; second resistor means connected between said input of said third coupled line and ground; inductor means connected between said output of said third coupled line and an output of said miniature directional coupler; and, third resistor means connected between said inductor means and ground.
Claim 13
Dependent Claim
37 words
A miniature directional coupler as claimed in claim 10 wherein said first coupled line and said third coupled line have a length of less than Λ o /4 where Λ o is center wavelength in coupled lines.
Claim 14
Dependent Claim
31 words
A miniature directional coupler as claimed in claim 11 wherein said first coupled line and said third coupled line have a length dependent on center frequency, insertion loss, coupling and directivity.
Claim 15
Dependent Claim
26 words
A miniature directional coupler as claimed in claim 1 2 wherein said first coupled line and said third coupled line have a length that are equal.
Claim 16
Dependent Claim
26 words
A miniature directional coupler as claimed in claim 13 wherein said second resistor means has a resistance value equal to impedance of said third coupled line.
Claim 17
Dependent Claim
26 words
A miniature directional coupler as claimed in claim 14 wherein said inductor means has an inductance value dependent on coupling flatness, center frequency and coupling value.
Claim 18
Dependent Claim
34 words
A miniature directional coupler as claimed in claim 15 wherein said third resistor means has a resistance value dependent on the impedance of said third coupled line and said value of said inductor means.
Claim 19
Dependent Claim
27 words
A miniature directional coupler as claimed in claim 16 wherein tuning of the center frequency and coupling is realized by varying the value of said inductor means.
References Cited (Backward Citations)
US4013981A
Cited
US4999593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |