US 2007/0176708 A1Published application

Narrow impedance conversion device

AssigneesKanji Otsuka, Tamotsu Usami, Yutaka Akiyama, Oki Electric Industry Co., Ltd., Kabushiki Kaisha Toshiba, Fujitsu Limited, Renesas Technology Corp., KYOCERA Corporation, Fuji Xerox Co., Ltd.

InventorsKanji Otsuka, Tamotsu Usami, Yutaka Akiyama

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Abstract

An impedance conversion device has four conductors arranged so that the first and second conductors form a transmission line having a first characteristic impedance, the third and fourth conductors form a transmission line having the first characteristic impedance, the first and third conductors form a transmission line having a second characteristic impedance, and the second and fourth conductors form a third transmission line having the second characteristic impedance. The second and fourth conductors are interconnected at proximate ends through a resistance equal to the first characteristic impedance. The third and fourth conductors are interconnected at proximate ends through a resistance equal to the second characteristic impedance. The lateral dimensions of the impedance conversion device are small enough to permit insertion in a stacked pair line.

Claims11

Dependent claims

An impedance conversion device comprising:

a first conductor having a first end and a second end;
a second conductor having a first end and a second end, disposed relative to the first conductor so that the first conductor and the second conductor form a first transmission line having a first characteristic impedance;
a third conductor having a first end and a second end, disposed relative to the first conductor so that the first conductor and the third conductor form a second transmission line having a second characteristic impedance different from the first characteristic impedance;
a fourth conductor having a first end and a second end, disposed relative to the second conductor so that the second conductor and the fourth conductor form a third transmission line having the second characteristic impedance, and disposed relative to the third conductor so that the third conductor and the fourth conductor form a fourth transmission line having the first characteristic impedance;
a first resistor having a resistance equal to the first characteristic impedance, having a first end connected to the second end of the second conductor and a second end connected to the second end of the fourth conductor;
and
a second resistor having a resistance equal to the second characteristic impedance, having a first end connected to the first end of the third conductor and a second end connected to the first end of the fourth conductor;
wherein
the second ends of the second and fourth conductors are mutually proximate;
and
the first ends of the third and fourth conductors are mutually proximate.

8 more elements

Dependencies are inferred from the claim text.