US4342969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for matching impedances between a helical resonator and a circuit connected thereto
Assignee: Ericsson Inc
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Filing: 1980-10-06
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Granted: 1982-08-03
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Expires: 2000-10-06
Abstract
Abstract Impedance matching between a helical resonator of a helical resonator filter and a circuit connected thereto is accomplished by the provision of a microstrip transmission line including a microstrip stub printed on a printed circuit board, the microstrip stub being short in comparison to the wavelength at the resonant frequency of the filter whereby the microstrip stub assumes the characteristics of an inductive impedance. A first electrical end of the microstrip stub is connected to a first terminal of the helical resonator and to a first terminal of the circuit, and a second electrical end of the microstrip stub is connected to a second terminal of the helical resonator and to a second terminal of the circuit.
Inventors
- 👤 Richard T. Myers
- 👤 David L. Roberson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/005; H01P5/00; H01P5/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
174 words
In a network for a printed circuit board having an insulative base and including a helical resonator and a cooperating electrical circuit, means for providing impedance matching between said helical resonator and said circuit, comprising: a. a microstrip transmission line including a microstrip stub printed on said base; b. means electrically interconnecting a first terminal of a helical resonator, a first terminal of said circuit, and a first electrical end of said microstrip stub; c. means electrically interconnecting a second terminal of said helical resonator, a second terminal of said circuit, and a second electrical end of said microstrip stub; and d. said microstrip stub being of an electrical length less than one-quarter wavelength at the resonator frequency of said helical resonator for constituting an inductive impedance, and having overall dimensions and being of a configuration preselected in accordance with the thickness and dielectric constant of said insulative base to provide a predetermined inductive impedance value for said microstrip stub at the resonant frequency of said helical resonator whereby said impedance matching is attained.
Claim 2
Dependent Claim
174 words
In a network for a printed circuit board having an insulative base and including a helical resonator and a cooperating electrical circuit, means for providing impedance matching between said helical resonator and said circuit, comprising: a. a microstrip transmission line including a microstrip stub printed on said base; b. means electrically interconnecting a first terminal of a helical resonator, a first terminal of said circuit, and a first electrical end of said microstrip stub; c. means electrically interconnecting a second terminal of said helical resonator, a second terminal of said circuit, and a second electrical end of said microstrip stub; and d. said microstrip stub being of an electrical length less than one-quarter wavelength at the resonator frequency of said helical resonator for constituting an inductive impedance, and having overall dimensions and being of a configuration preselected in accordance with the thickness and dielectric constant of said insulative base to provide a predetermined inductive impedance value for said microstrip stub at the resonant frequency of said helical resonator whereby said impedance matching is attained.
Claim 3
Dependent Claim
12 words
The network defined in claim 1, wherein said microstrip stub is planar.
Claim 4
Dependent Claim
26 words
The network defined in claim 1 or claim 2, wherein said microstrip stub is elongated and is bent upon itself to conserve the space occupied thereby.
Claim 5
Dependent Claim
14 words
The network defined in claim 3, wherein said microstrip stub includes a coiled section.
Claim 6
Dependent Claim
201 words
An improved printed circuit board arrangement comprising: a. an insulative base having conducting ground planes on appreciable areas of opposed faces of said base; b. a helical resonator positioned in the vicinity of a first of said ground planes; and c. means for providing impedance matching between said helical resonator and an electrical circuit, comprising: 1. a microstrip transmission line formed by selected portions of the second of said ground planes; 2. means electrically interconnecting a first terminal of said helical resonator, a first terminal of said circuit, and a first electrical end of said microstrip transmission line; 3. means electrically interconnecting a second terminal of said helical resonator, a second terminal of said circuit, and a second electrical end of said microstrip transmission line; and 4. said microstrip transmission line being of an electrical length less than one-quarter wavelength at the resonator frequency of said helical resonator for constituting an inductive impedance, and having overall dimensions and being of a configuration preselected in accordance with the thickness and dielectric constant of said insulative base to provide a predetermined inductive impedance value for said microstrip transmission line at the resonant frequency of said helical resonator whereby said impedance matching is attained.
Claim 7
Dependent Claim
201 words
An improved printed circuit board arrangement comprising: a. an insulative base having conducting ground planes on appreciable areas of opposed faces of said base; b. a helical resonator positioned in the vicinity of a first of said ground planes; and c. means for providing impedance matching between said helical resonator and an electrical circuit, comprising: 1. a microstrip transmission line formed by selected portions of the second of said ground planes; 2. means electrically interconnecting a first terminal of said helical resonator, a first terminal of said circuit, and a first electrical end of said microstrip transmission line; 3. means electrically interconnecting a second terminal of said helical resonator, a second terminal of said circuit, and a second electrical end of said microstrip transmission line; and 4. said microstrip transmission line being of an electrical length less than one-quarter wavelength at the resonator frequency of said helical resonator for constituting an inductive impedance, and having overall dimensions and being of a configuration preselected in accordance with the thickness and dielectric constant of said insulative base to provide a predetermined inductive impedance value for said microstrip transmission line at the resonant frequency of said helical resonator whereby said impedance matching is attained.
Claim 8
Dependent Claim
24 words
The arrangement defined in claim 5, wherein said microstrip transmission line is elongated and is bent upon itself to conserve the space occupied thereby.
References Cited (Backward Citations)
US2041378A
Cited
US2446982A
Cited
US2794174A
Cited
US2938175A
Cited
US3003126A
Cited
US3400295A
Cited
US3621484A
Cited
US3764942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |