US3701054A
Expired / Lapsed
US
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Impedance matching structure having reduced portions of transmission lines connected to offset stripline center conductors with strip guides connecting said center conductors
Abstract This invention relates to an impedance matching structure and technique that is particularly useful in junction circulators. The improved impedance match between the circulator junction and a strip transmission line, for example, is accomplished by abruptly reducing the size of the transmission line that is under the conventional ferrite puck or disk structure by a factor of approximately four. A broadband impedance match structure is obtained by this structure and technique, and the impedance plot can be shifted reactively or resistively by: (1) varying the strip width of the transmission line under the puck, or (2) varying the amount that the ferrite puck overlaps the full-width portion of the transmission line, or (3) varying the length of the reduced width transmission line.
A multi-port junction circulator having improved impedance matching characteristics when adapted to operate in a magnetic field and comprising: five strip transmission lines having portions of reduced width; five circularly-shaped offset stripline center conductors, each of said center conductors having a diameter substantially greater than the width of said portions of reduced width and formed at one end of each of said portions of reduced width; strip guides joining said fine offset center conductors in a generally circular arrangement to symmetrically position said transmission lines and said center conductors about a center of the generally circular arrangement; ferrite pucks positioned concentric with respect to said center conductors and on each side thereof to overlap said center conductors and said portions of reduced width; and ground plans positioned about said pucks and said transmission lines thereby producing a five-port junction circulator having improved impedance matching characteristics.
Claim 2
Dependent Claim
145 words
A multi-port junction circulator having improved impedance matching characteristics when adapted to operate in a magnetic field and comprising: five strip transmission lines having portions of reduced width; five circularly-shaped offset stripline center conductors, each of said center conductors having a diameter substantially greater than the width of said portions of reduced width and formed at one end of each of said portions of reduced width; strip guides joining said fine offset center conductors in a generally circular arrangement to symmetrically position said transmission lines and said center conductors about a center of the generally circular arrangement; ferrite pucks positioned concentric with respect to said center conductors and on each side thereof to overlap said center conductors and said portions of reduced width; and ground plans positioned about said pucks and said transmission lines thereby producing a five-port junction circulator having improved impedance matching characteristics.