US3745488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave impedance-matching network
Assignee: AG Communication Systems Corp
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Filing: 1971-11-01
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Granted: 1973-07-10
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Expires: 1991-11-01
Abstract
Abstract In preferred form, a matching network includes a transmission line comprising a pair of parallel inner conductors symmetrically located in an outer conductor enclosure for supporting odd and even modes of propagation. Impedances to be matched are connected between adjacent one ends of the inner conductors and the enclosure. First and second sections of the transmission line, measured from the one ends of the conductors, are formed by short circuiting the inner conductors together and both inner conductors to the enclosure, respectively, at points that are spaced from the one ends of the conductors. The first transmission line section supports both the even and odd modes of propagation while the second line section primarily supports only the even mode of propagation. The positions of the short circuits are moved along the inner conductors in order to match the impedances. In an alternate embodiment, the network includes a pair of parallel inner conductors symmetrically located in a first cylindrical conductor, the latter being coaxially supported in a second cylindrical conductor. First and second sections of short circuited transmission line are formed by short circuiting the cylinders together and by short circuiting both inner conductors to the first cylinder, respectively. The positions of the short circuits are separately moved along the cylinders in order to match impedances that are connected between associated inner conductors and the second cylinder. Stripline versions of these networks are also disclosed.
Inventors
- 👤 R Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04; H03; H03B; H03B5/00; H03B5/18; H03B5/1805; H03B5/1841; H03B5/1847
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
243 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors; a conductive ground plane enclosure supporting said parallel conductors therein; said conductors being oriented in said enclosure with respect thereto for supporting odd and even moDes therebetween, said parallel conductors having one ends thereof for connection to associated impedances to be matched; means for connecting the first and second impedances between said adjacent one ends of said first and second conductors, respectively, and said enclosure; a movable wall of said enclosure electrically short-circuiting said parallel conductors together and to said enclosure for providing a first short circuit; the lengths of parallel conductors between the one ends thereof and said wall defining a length of transmission line of adjustable length primarily supporting over its length only even modes; a third conductor electrically movably contacting both of said parallel conductors at second adjacent points thereon between said one ends thereof and said wall for providing a second short circuit, the length of parallel conductors between the one ends thereof and said third conductor defining a length of transmission line of adjustable length supporting both even and odd modes; and a rod extending slidably through said wall and between said parallel conductors and being connected to said third conductor for moving the position of the latter and the second short circuit provided thereby along said parallel conductors.
Claim 2
Dependent Claim
243 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors; a conductive ground plane enclosure supporting said parallel conductors therein; said conductors being oriented in said enclosure with respect thereto for supporting odd and even moDes therebetween, said parallel conductors having one ends thereof for connection to associated impedances to be matched; means for connecting the first and second impedances between said adjacent one ends of said first and second conductors, respectively, and said enclosure; a movable wall of said enclosure electrically short-circuiting said parallel conductors together and to said enclosure for providing a first short circuit; the lengths of parallel conductors between the one ends thereof and said wall defining a length of transmission line of adjustable length primarily supporting over its length only even modes; a third conductor electrically movably contacting both of said parallel conductors at second adjacent points thereon between said one ends thereof and said wall for providing a second short circuit, the length of parallel conductors between the one ends thereof and said third conductor defining a length of transmission line of adjustable length supporting both even and odd modes; and a rod extending slidably through said wall and between said parallel conductors and being connected to said third conductor for moving the position of the latter and the second short circuit provided thereby along said parallel conductors.
Claim 3
Dependent Claim
228 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors; a conductive ground plane enclosure supporting said parallel conductors therein; said conductors being oriented in said enclosure with respect thereto for supporting odd and even modes therebetween, said parallel conductors having one ends thereof for connection to associated impedances to be matched; means for connecting the first and second impedances between said adjacent one ends of said first and second conductors, respectively, and said enclosure; a movable wall of said enclosure electrically short-circuiting said parallel conductors together and to said enclosure for providing a first short circuit; the lengths of parallel conductors between the one ends thereof and said wall defining a length of transmission line of adjustable length primarily supporting over its length only even modes; a third conductor electrically movably contacting both of said parallel conductors at second adjacent points thereon between said one ends thereof and said wall for providing a second short circuit, the length of parallel conductors between the one ends thereof and said third conductor defining a length of transmission line of adjustable length supporting both even and odd modes; and a fourth conductor electrically connecting and short-circuiting said parallel conductors together and being located approximately intermediate said wall and said third conductor.
Claim 4
Dependent Claim
228 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors; a conductive ground plane enclosure supporting said parallel conductors therein; said conductors being oriented in said enclosure with respect thereto for supporting odd and even modes therebetween, said parallel conductors having one ends thereof for connection to associated impedances to be matched; means for connecting the first and second impedances between said adjacent one ends of said first and second conductors, respectively, and said enclosure; a movable wall of said enclosure electrically short-circuiting said parallel conductors together and to said enclosure for providing a first short circuit; the lengths of parallel conductors between the one ends thereof and said wall defining a length of transmission line of adjustable length primarily supporting over its length only even modes; a third conductor electrically movably contacting both of said parallel conductors at second adjacent points thereon between said one ends thereof and said wall for providing a second short circuit, the length of parallel conductors between the one ends thereof and said third conductor defining a length of transmission line of adjustable length supporting both even and odd modes; and a fourth conductor electrically connecting and short-circuiting said parallel conductors together and being located approximately intermediate said wall and said third conductor.
Claim 5
Dependent Claim
136 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors that are rods having unequal diameters; a conductive ground plane enclosure supporting said parallel conductor rods therein; said conductor rods being oriented with respect to said ground plane enclosure for supporting odd and even modes therebetween, said parallel conductor rods having first adjacent points thereon for connection to the associated impedances to be matched; first means electrically short-circuiting said parallel conductor rods together; and second means electrically short-circuiting said parallel conductor rods together and to said ground plane; the positions of said first and second short circuits provided by said first and second short-circuiting means being independently movable along said parallel conductor rods for tuning the apparatus.
Claim 6
Dependent Claim
136 words
Transmission line apparatus geometrically configured for supporting both odd and even mode electromagnetic waves for matching a first impedance to a second impedance, comprising first and second parallel conductors that are rods having unequal diameters; a conductive ground plane enclosure supporting said parallel conductor rods therein; said conductor rods being oriented with respect to said ground plane enclosure for supporting odd and even modes therebetween, said parallel conductor rods having first adjacent points thereon for connection to the associated impedances to be matched; first means electrically short-circuiting said parallel conductor rods together; and second means electrically short-circuiting said parallel conductor rods together and to said ground plane; the positions of said first and second short circuits provided by said first and second short-circuiting means being independently movable along said parallel conductor rods for tuning the apparatus.
Claim 7
Dependent Claim
92 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even mOdes and comprising lengths of a first ground plane and a pair of parallel conductors; a second transmission line section; first and second means producing short circuits on said first and second transmission line sections, respectively, for defining the electrical lengths of the associated line sections; and means for connecting impedances to be matched to each of said line sections at adjacent points that are spaced away from the ends of associated parallel conductors thereof.
Claim 8
Dependent Claim
92 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even mOdes and comprising lengths of a first ground plane and a pair of parallel conductors; a second transmission line section; first and second means producing short circuits on said first and second transmission line sections, respectively, for defining the electrical lengths of the associated line sections; and means for connecting impedances to be matched to each of said line sections at adjacent points that are spaced away from the ends of associated parallel conductors thereof.
Claim 9
Dependent Claim
95 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane and a pair of parallel conductors; a second transmission line section comprising a second ground plane oriented with respect to said first ground plane for supporting electromagnetic fields therebetween; first and second means producing short circuits on said first and second transmission line sections, respectively, for defining the electrical length of the associated line sections; and means for connecting impedances to be matched to each of said line sections.
Claim 10
Dependent Claim
95 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane and a pair of parallel conductors; a second transmission line section comprising a second ground plane oriented with respect to said first ground plane for supporting electromagnetic fields therebetween; first and second means producing short circuits on said first and second transmission line sections, respectively, for defining the electrical length of the associated line sections; and means for connecting impedances to be matched to each of said line sections.
Claim 11
Dependent Claim
142 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane enclosure and a pair of parallel conductors, said first ground plane being an enclosure supporting said parallel conductors therein; a second transmission line section comprising a second ground plane enclosure supporting said first enclosure therein and being oriented with respect to the latter for supporting electromagnetic fields therebetween; a first contact electrically connecting and short-circuiting both of said parallel conductors to said first ground plane enclosure, said first transmission line section comprising the short-circuited lengths of said parallel conductors and said first ground plane enclosure; means producing a short circuit on said second transmission line section for defining the electrical length thereof; and means for connecting impedances to be matched to each of said line sections.
Claim 12
Dependent Claim
142 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane enclosure and a pair of parallel conductors, said first ground plane being an enclosure supporting said parallel conductors therein; a second transmission line section comprising a second ground plane enclosure supporting said first enclosure therein and being oriented with respect to the latter for supporting electromagnetic fields therebetween; a first contact electrically connecting and short-circuiting both of said parallel conductors to said first ground plane enclosure, said first transmission line section comprising the short-circuited lengths of said parallel conductors and said first ground plane enclosure; means producing a short circuit on said second transmission line section for defining the electrical length thereof; and means for connecting impedances to be matched to each of said line sections.
Claim 13
Dependent Claim
178 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane enclosure and a pair of parallel conductors; a second transmission line section comprising a second ground plane that is oriented with respect to said first ground plane for supporting electromagnetic fields therebetween; a first contact electrically connecting and short-circuiting both of said parallel conductors to said first ground plane for defining the electrical length of said first line section, said first transmission line section comprising the short-circuited lengths of said parallel conductors and said first ground plane; a second contact electrically connecting said first and second ground planes together for defining the electrical length of said second line section, said second transmission line section comprising the short-circuited lengths of said first and second ground planes; and means for connecting impedances to be matched to each of said line sections; said first ground plane being located between, spaced from, and parallel to said second ground plane and the plane defined by said conductors.
Claim 14
Dependent Claim
178 words
An impedance matching network comprising a first transmission line section supporting a combination of odd and even modes and comprising lengths of a first ground plane enclosure and a pair of parallel conductors; a second transmission line section comprising a second ground plane that is oriented with respect to said first ground plane for supporting electromagnetic fields therebetween; a first contact electrically connecting and short-circuiting both of said parallel conductors to said first ground plane for defining the electrical length of said first line section, said first transmission line section comprising the short-circuited lengths of said parallel conductors and said first ground plane; a second contact electrically connecting said first and second ground planes together for defining the electrical length of said second line section, said second transmission line section comprising the short-circuited lengths of said first and second ground planes; and means for connecting impedances to be matched to each of said line sections; said first ground plane being located between, spaced from, and parallel to said second ground plane and the plane defined by said conductors.
Claim 15
Dependent Claim
32 words
Apparatus according to claim 2 wherein said fourth short circuiting conductor extends between said parallel conductors and connects the latter together over the lengths thereof between said third conductor and said wall.
Claim 16
Dependent Claim
80 words
Apparatus according to claim 4 wherein said first ground plane is an enclosure supporting said parallel conductors therein and said first short circuiting means comprises a movable wall in said enclosure, said wall being electrically connected to both of said conductors and to said enclosure and positioned between the connection points and adjacent one ends of said parallel conductors, said firSt transmission line section comprising the short circuited length of said parallel conductors between said wall and said connection points.
Claim 17
Dependent Claim
53 words
Apparatus according to claim 9 wherein said second short circuiting means comprises an electrically conductive trombone sliding structure extending over and electrically connected to the other ends of said parallel conductors, said second transmission line section comprising the short circuited length of said parallel conductors between said trombone structure and said connection points.
Claim 18
Dependent Claim
47 words
Apparatus according to claim 5 wherein said first short circuiting means comprises a first contact electrically connecting both of said parallel conductors and said first ground plane together, said first transmission line section comprising the short circuited lengths of said parallel conductors and said first ground plane.
Claim 19
Dependent Claim
41 words
Apparatus according to claim 11 wherein said second short circuiting means comprises a second contact electrically connecting said first and second ground planes together, said second transmission line section comprising the short circuited lengths of said first and second ground planes.
Claim 20
Dependent Claim
36 words
Apparatus according to claim 6 wherein said short circuiting means comprises a second contact electrically connecting said first and second enclosures, said second line section comprising the short circuited lengths of said first and second enclosures.
Claim 21
Dependent Claim
31 words
Apparatus according to claim 13 wherein said first and second contacts are movable in said enclosures for varying the electrical lengths of the associated line sections and matching impedances connected thereto.
Claim 22
Dependent Claim
48 words
Apparatus according to claim 7 wherein a first impedance is connected between one of said parallel conductors and said first ground plane and a second impedance to be matched to the first impedance is connected between the other one of said parallel conductors and said second ground plane.
Claim 23
Dependent Claim
39 words
Apparatus according to claim 15 wherein said line sections are stripline circuits, said first ground plane extending around said conductors over the lengths thereof, said second ground plane also extending around said first ground plane over the length thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |