US3662294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microstrip impedance matching circuit with harmonic terminations
Assignee: Motorola Solutions Inc
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Filing: 1970-05-05
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Granted: 1972-05-09
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Expires: 1990-05-05
Abstract
Abstract A microstrip impedance matching circuit has fixed harmonic terminations in the form of a pair of open-circuited stubs, each having a length equal to a quarter wavelength of a different harmonic frequency, connected to the main transmission line to cause the impedance at the harmonic frequencies to be made constant irrespective of the nature of the load impedance at the harmonic frequencies.
Inventors
- 👤 Paul H Jacobs
- 👤 Robert L Peay
- 👤 David S Wisherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:55
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/383; H01; H01P; H01P5/00; H01P5/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
227 words
A microstrip impedance matching circuit for coupling an RF amplifier, operating at a fundamental frequency, to a load including in combination: a sheet of dielectric material; a conductive coating on one side of said sheet of dielectric material; impedance matching circuit means including a conductive strip having an input end and an output end on the other side of said sheet of dielectric material for coupling an amplifier to a load; and first and second open-circuited stubs connected to and extending substantially 90* from said conductive strip, the length of said first stub being selected to be one-fourth the wavelength of the second harmonic of the fundamental frequency and the length of the second stub being selected to be one-fourth the wavelength of the third harmonic of the fundamental frequency, said first and second stubs being connected to said conductive strip at locations presenting substantially open circuits at said second and third harmonic frequencies to signals applied to the input end of said conductive strip, with said first stub reflecting a short circuit to signals at said second harmonic of the fundamental frequency at the point where said first stub is connected to said conductive strip, and said second stub reflecting a short circuit to signals at said third harmonic of said fundamental frequency at the point where said second stub is connected to said conductive strip.
Claim 2
Dependent Claim
227 words
A microstrip impedance matching circuit for coupling an RF amplifier, operating at a fundamental frequency, to a load including in combination: a sheet of dielectric material; a conductive coating on one side of said sheet of dielectric material; impedance matching circuit means including a conductive strip having an input end and an output end on the other side of said sheet of dielectric material for coupling an amplifier to a load; and first and second open-circuited stubs connected to and extending substantially 90* from said conductive strip, the length of said first stub being selected to be one-fourth the wavelength of the second harmonic of the fundamental frequency and the length of the second stub being selected to be one-fourth the wavelength of the third harmonic of the fundamental frequency, said first and second stubs being connected to said conductive strip at locations presenting substantially open circuits at said second and third harmonic frequencies to signals applied to the input end of said conductive strip, with said first stub reflecting a short circuit to signals at said second harmonic of the fundamental frequency at the point where said first stub is connected to said conductive strip, and said second stub reflecting a short circuit to signals at said third harmonic of said fundamental frequency at the point where said second stub is connected to said conductive strip.
Claim 3
Dependent Claim
44 words
The combination according to claim 1 wherein the one of said first and second open-circuited stubs which is connected to said conductive strip nearest the input end thereof is spaced from said input end by a distance equal to the length of such stub.
Claim 4
Dependent Claim
26 words
The combination according to claim 2 wherein said second open-circuited stub is located nearer the input end of said conductive strip than said first open-circuited stub.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |