Search International and National Patent Collections

1. (WO2013157282) TRANSMITTER AND TRANSMISSION METHOD

Pub. No.:    WO/2013/157282    International Application No.:    PCT/JP2013/051760
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Tue Jan 29 00:59:59 CET 2013
IPC: H04B 1/04
G01R 29/00
G01R 29/08
H04B 17/00
Applicants: NEC CORPORATION
日本電気株式会社
KIRISAWA, Akihiro
桐沢 明洋
Inventors: KIRISAWA, Akihiro
桐沢 明洋
Title: TRANSMITTER AND TRANSMISSION METHOD
Abstract:
This transmitter has: a transmission amplifier for amplifying the power of a transmission RF signal; a bandpass filter for suppressing frequency components, other than a desired frequency component, in the transmission RF signal amplified by the transmission amplifier, and outputting the signal to an antenna; an extraction unit disposed between the transmission amplifier and the bandpass filter, for extracting, in the form of a traveling wave signal, a portion of the transmission RF signal amplified by the transmission amplifier, and for extracting, in the form of a reflected wave signal, a signal produced by reflection of the transmission RF signal by the antenna; an RMS calculation unit for calculating individual RMS values for the traveling wave signal and for the reflected wave signal extracted by the extraction unit; and a VSWR calculation unit for calculating a VSWR value on the basis of the individual RMS values of the traveling wave signal and the reflected wave signal calculated by the RMS calculation unit.