Title:
RADIO TRANSMITTING APPARATUS, STANDING WAVE RATIO MEASURING DEVICE AND STANDING WAVE RATIO MEASURING METHOD
Document Type and Number:
WIPO Patent Application WO/2014/045488
Kind Code:
A1
Abstract:
A radio transmitting apparatus is provided with a transmission signal generating device, a detection circuit, and a standing wave ratio measuring circuit. The detection circuit detects traveling wave detection voltage and reflected wave detection voltage that correspond to a transmission signal. The standing wave ratio measuring circuit measures the voltage standing wave ratio on the basis of the traveling wave detection voltage and the reflected wave detection voltage. The detection circuit comprises a detection unit and a time constant circuit. The detection circuit detects the traveling wave detection voltage and the reflected wave detection voltage. The time constant circuit averages the respective temporal variations of the traveling wave detection voltage and the reflected wave detection voltage that have been detected by the detection unit. In the time constant circuit, the time constant is set shorter in the state where the transmission signal rises than in the state where the transmission signal falls.
Inventors:
MOCHIZUKI TAKUJI (JP)
Application Number:
PCT/JP2013/002826
Publication Date:
March 27, 2014
Filing Date:
April 25, 2013
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04B1/04; G01R27/06; H04B17/00
Domestic Patent References:
| WO2000002322A1 | 2000-01-13 |
Foreign References:
| JP2008193719A | 2008-08-21 | |||
| JP2011010120A | 2011-01-13 |
Attorney, Agent or Firm:
IEIRI, Takeshi (JP)
House ON 健 (JP)
House ON 健 (JP)
Download PDF:
Previous Patent: IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, AND COMPUTER PROGRAM
Next Patent: ILLUMINATION LIGHT SOURCE AND ILLUMINATION DEVICE
Next Patent: ILLUMINATION LIGHT SOURCE AND ILLUMINATION DEVICE