Patent Number: 8,816,794

Title: Signal branching filter, electronic device using the same, antenna apparatus, and signal transmission system used in all of the above

Abstract: A signal branching filter according to the invention is a signal branching filter connected to a network having at least four terminals. The signal branching filter includes a first line one end of which is connected to a first terminal of the network, a second line one end of which is connected to a second terminal of the network, a third line one end of which is connected to a third terminal of network, and a fourth line one end of which is connected to a fourth terminal of the network. The other end of the first line and the other end of the second line are connected to each other at a first node, and the other end of the third line and the other end of the fourth line are connected to each other at a second node. When a signal is received from the first node, a phase difference between a phase of a signal appearing on a second node side of the third line and a phase of a signal appearing on a second node side of the fourth line is almost 180.degree..+-.360.degree.*n is an integer equal to or larger than 0).

Inventors: Sako; Motohiko (Osaka, JP), Fukushima; Susumu (Osaka, JP), Kitamura; Hidenori (Osaka, JP), Yamamoto; Yuta (Osaka, JP), Hayashi; Takuya (Kyoto, JP)

Assignee: Panasonic Corporation

International Classification: H01P 5/12 (20060101)

Expiration Date: 8/26/12018