Title:
無線伝送装置及び無線伝送方法
Document Type and Number:
Japanese Patent JP6892359
Kind Code:
B2
Abstract:
To provide a technology which can use a power amplifier with distortion compensation function and a highly efficient amplifier, achieve high output of transmission power and low power consumption and can execute stable antenna switching, in a radio transmitter such as FPU.SOLUTION: A helicopter radio transmission system 1 includes antenna switching parts 81, 82 arranged at the subsequent stages of a first and a second power amplifiers 50A, 50B and is configured to set input signals to the first and the second power amplifiers 50A, 50B to be always input, thereby executing stable feedback type distortion compensation processing at the first and the second power amplifiers 50A, 50B regardless of an antenna switching operation. Attachment of an output amplifier 24 of a second IF signal permits a direct input into the first and the second power amplifiers 50A, 50B at the subsequent stages, thereby executing distortion compensation processing with the second IF signal as it is.SELECTED DRAWING: Figure 2
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Inventors:
Mikio Fujikura
Application Number:
JP2017172789A
Publication Date:
June 23, 2021
Filing Date:
September 08, 2017
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H04B7/06; H03F1/32; H03F3/24; H04B1/04
Domestic Patent References:
| JP2010154293A | ||||
| JP2013236145A | ||||
| JP6164491A | ||||
| JP2008042582A | ||||
| JP11298384A | ||||
| JP2014039154A |
Foreign References:
| WO2007046370A1 | ||||
| WO2013084739A1 |
Attorney, Agent or Firm:
Shiroyuki Hori
Yukihiko Maejima
Yukihiko Maejima