Directional coupler and wireless communication device

Patent metadata

Field	Value
Publication number	US-9178264-B2
Application number	US-201514638803-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Jul 27, 2011
Publication date	Nov 3, 2015
Grant date	Nov 3, 2015

Abstract

A directional coupler according to the present invention includes a primary line for transmitting a transmission signal; an input port for inputting the transmission signal to the primary line; an output port for outputting the transmission signal from the primary line; a secondary line for electromagnetically coupling with the primary line to extract part of the transmission signal; a coupling port provided at one end of the secondary line; an isolation port provided at the other end of the secondary line; and a low pass filter unit having a function of low pass filter, disposed between the secondary line and the coupling port.

First claim

What is claimed is:

1. A directional coupler comprising:
a primary line for transmitting a transmission signal;
an input port provided at one end of said primary line for inputting the transmission signal to said primary line;
an output port provided at the other end of said primary line for outputting the transmission signal from said primary line;
a secondary line for electromagnetically coupling with said primary line to extract part of the transmission signal;
a coupl…

Assignees

• Tdk Corp

Inventors

• Kuwajima Hajime
• Fujiwara Toshiyasu
• Ohyama Naoto
• Tsuya Yoshikazu
• Sasaki Masami

Classifications

• H01P5/18 Primary

  Electricity · mapped topic

• H03H7/0138

  Electricity · mapped topic

• H04B1/0053

  Electricity · mapped topic

• H04B1/0458

  Electricity · mapped topic