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US3675164A Expired / Lapsed US ⏱️ 0.0 years remaining

Impedance-matching network

Assignee: AT&T Inc
•
Filing: 1969-10-21
•
Granted: 1972-07-04
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Expires: 1989-10-21
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Abstract

Abstract This application describes an impedance-matching network comprising two transformers having turns ratios, 1:N and 1:M, where N and M are rational numbers. The first of these transformers senses the signal current flowing in the signal wavepath and induces a secondary current that is proportional thereto. The secondary current, thus induced, energizes the second transformer which injects into said wavepath a component of current that is proportional to the signal current by a factor equal to the product of the turns ratios of the two transformers. When at least one of the two transformers is a two-winding transformer, the effective turns ratio of this network is given by 1:1 + OR - 1/(NM), where the sign ( + OR - ) is determined by the manner in which the transformers are connected. When two, single-winding transformers, such as autotransformers, are used, the effective turns ratio is given by 1: ((N-1)/N + OR - 1/MN).

Inventors

  • 👤 Harold Seidel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 21:03
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 123 words
In an electromagnetic wavepath, an impedance-matching network for coupling between two unequal impedances comprising: a first transformer having a turns ratio 1:N and a second transformer having a turns ratio 1:M; characterized in that: said first transformer senses the current in said wavepath and, in response thereto, couples a first current into a winding of said second transformer, inducing a second current; and in that said second current is injected into said wavepath, producing a net effective turns ratio 1:T for said network given by 1:T 1(A + OR - 1/(NM), where A is a parameter which depends upon the type of transformers used, and the sign ( + OR - ) is determined by the manner in which said transformers are connected.
Claim 2
Dependent Claim 123 words
In an electromagnetic wavepath, an impedance-matching network for coupling between two unequal impedances comprising: a first transformer having a turns ratio 1:N and a second transformer having a turns ratio 1:M; characterized in that: said first transformer senses the current in said wavepath and, in response thereto, couples a first current into a winding of said second transformer, inducing a second current; and in that said second current is injected into said wavepath, producing a net effective turns ratio 1:T for said network given by 1:T 1(A + OR - 1/(NM), where A is a parameter which depends upon the type of transformers used, and the sign ( + OR - ) is determined by the manner in which said transformers are connected.
Claim 3
Dependent Claim 16 words
The network according to claim 1 wherein both transformers are two-winding transformers; and wherein A 1.
Claim 4
Dependent Claim 48 words
The network according to claim 2 wherein one winding of one transformer is connected in series with said wavepath; one winding of the other of said transformers is in shunt with said wavepath; and wherein the other windings of said transformers are connected in series with each other.
Claim 5
Dependent Claim 28 words
The combination according to claim 1 wherein one of said transformers is a two-winding transformer; the other of said transformers is a single-winding transformer; and wherein A 1.
Claim 6
Dependent Claim 17 words
The network according to claim 1 wherein both transformers are single-winding transformers; and wherein A (N-1) /N.
Claim 7
Dependent Claim 66 words
In an electromagnetic wavepath, an impedance-matching network for coupling between two, unequal impedances comprising: a plurality of n pairs of transformers having turns ratios 1:Nj and 1:Mj, respectively, where Nj and Mj are rational numbers; characterized in that: each of said pairs of transformers is connected in accordance with claim 1 and cascaded along said wavepath to produce a net effective turns ratio 1:T given by

References Cited (Backward Citations)

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US2470307A Cited
US2777996A Cited
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US3430162A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-07-04 1976-01-03 1976-07-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-07-04 1980-01-03 1980-07-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-07-04 1984-01-03 1984-07-04 $7700.00 Window Closed / Lapsed

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