US5473281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier circuit having impedance matching circuit
Assignee: NEC Corp
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Filing: 1994-09-20
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Granted: 1995-12-05
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Expires: 2014-09-20
Abstract
Abstract An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z Tr and a first transmission line having a characteristic impedance of Z 0 , the impedance matching circuit including a second transmission line having a characteristic impedance Z T0 ≈(Z Tr ×Z 0 ) 1/2 and a length of a quarter wavelength, and a high-harmonic processing circuit disposed at the connection of the second transmission line to the first transmission line. The high-harmonic component processing circuit has two parallel stubs each having a certain characteristic impedance and a released tip end, the two parallel stubs having length of one-eighth wavelength and one-twelfth wavelength, respectively.
Inventors
- 👤 Kazuhiko Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z Tr and a first transmission line having a characteristic impedance of Z 0 , said impedance matching circuit comprising: a second transmission line disposed between a terminal of said transistor and said first transmission line, said second transmission line having a characteristic impedance of Z T0 ≈(Z Tr ×Z 0 ) 1/2 and a length of a quarter wavelength; and a higher harmonic processing circuit disposed at the connection of said second transmission line to said first transmission line, said higher harmonic processing circuit having two parallel stubs each having a certain characteristic impedance and an open tip end, said two parallel stubs having length of a one-eighth wavelength and a one-twelfth wavelength, respectively.
Claim 2
Dependent Claim
132 words
An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z Tr and a first transmission line having a characteristic impedance of Z 0 , said impedance matching circuit comprising: a second transmission line disposed between a terminal of said transistor and said first transmission line, said second transmission line having a characteristic impedance of Z T0 ≈(Z Tr ×Z 0 ) 1/2 and a length of a quarter wavelength; and a higher harmonic processing circuit disposed at the connection of said second transmission line to said first transmission line, said higher harmonic processing circuit having two parallel stubs each having a certain characteristic impedance and an open tip end, said two parallel stubs having length of a one-eighth wavelength and a one-twelfth wavelength, respectively.
Claim 3
Dependent Claim
143 words
An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z Tr and a first transmission line having a characteristic impedance of Z 0 , said impedance matching circuit comprising: a second transmission line disposed between a terminal of said transistor and said first transmission line, said second transmission line having a characteristic impedance of Z T0 ≈(Z Tr ×Z 0 ) 1/2 and a length of a quarter wavelength; and a higher harmonic processing circuit disposed at the connection of said second transmission line to said first transmission line, said higher harmonic processing circuit having N parallel stubs each having an open tip end, each of said parallel stubs having a length L defined by a following equation: L=λ/4(1+m) wherein λ represents a wavelength, and m represents an integer ranging from one (1) to N.
Claim 4
Dependent Claim
143 words
An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z Tr and a first transmission line having a characteristic impedance of Z 0 , said impedance matching circuit comprising: a second transmission line disposed between a terminal of said transistor and said first transmission line, said second transmission line having a characteristic impedance of Z T0 ≈(Z Tr ×Z 0 ) 1/2 and a length of a quarter wavelength; and a higher harmonic processing circuit disposed at the connection of said second transmission line to said first transmission line, said higher harmonic processing circuit having N parallel stubs each having an open tip end, each of said parallel stubs having a length L defined by a following equation: L=λ/4(1+m) wherein λ represents a wavelength, and m represents an integer ranging from one (1) to N.
Claim 5
Dependent Claim
42 words
The amplifier circuit as recited in claim 1, wherein said transistor and said second transmission line are monolithic integrated on a semi-insulating compound semiconductor substrate, and said higher harmonic processing circuit and said first transmission line are located on a dielectric substrate.
Claim 6
Dependent Claim
42 words
The amplifier circuit as recited in claim 2, wherein said transistor and said second transmission line are monolithic integrated on a semi-insulating compound semiconductor substrate, and said higher harmonic processing circuit and said first transmission line are located on a dielectric substrate.
References Cited (Backward Citations)
US5363060A
Cited
US5352990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-04 | 1999-06-05 | 1999-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-04 | 2003-06-05 | 2003-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-04 | 2007-06-05 | 2007-12-05 | $7700.00 | Window Closed / Lapsed |