Title:
FILTER CIRCUIT, CLASS-F POWER AMPLIFIER, INVERSE CLASS-F POWER AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2013/157298
Kind Code:
A1
Abstract:
The present invention is a filter circuit that filters an input signal for a given frequency bandwidth, and is provided with a 1/4 wavelength open stub, the length of which is one quarter of the wavelength of the maximum frequency of the given frequency bandwidth, and a first phase adjustment unit having negative group delay characteristics and connected to an input terminal of the 1/4 wavelength open stub.
Inventors:
MOTOI KEIICHI (JP)
Application Number:
PCT/JP2013/054476
Publication Date:
October 24, 2013
Filing Date:
February 22, 2013
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H01P1/203; H03F1/02; H03F3/24; H03F3/60; H03H7/01
Foreign References:
| JP2011035761A | 2011-02-17 | |||
| JP2008113402A | 2008-05-15 | |||
| JP2007306299A | 2007-11-22 | |||
| JP2007235119A | 2007-09-13 |
Attorney, Agent or Firm:
MIYAZAKI, Teruo et al. (JP)
Akio Miyazaki (JP)
Akio Miyazaki (JP)
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