Title:
PHASE SHIFTER, IMPEDANCE MATCHING CIRCUIT, MULTIPLEXER/DEMULTIPLEXER AND COMMUNICATION TERMINAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/152603
Kind Code:
A1
Abstract:
This phase shifter is provided with: a transformer (T) which is connected between a first port (P1) and a second port (P2), comprises a first coil (L1) and a second coil (L2) magnetically coupled to the first coil (L1), and includes a parasitic inductance component; and an impedance adjustment circuit comprising reactive elements (C1, C2 and C3) which suppress deviations in the impedance resulting from the parasitic inductance component of the transformer. The coefficient of coupling between the first coil (L1) and the second coil (L2) of the transformer (T), and the values of the reactive elements (C1, C2 and C3) in the impedance adjustment circuit are determined in such a way that the amount of phase shift differs depending on the frequency band.
Inventors:
ISHIZUKA KENICHI (JP)
NISHIDA HIROSHI (JP)
NISHIDA HIROSHI (JP)
Application Number:
PCT/JP2016/057914
Publication Date:
September 29, 2016
Filing Date:
March 14, 2016
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/18; H03H7/38
Foreign References:
| JPH0738368A | 1995-02-07 | |||
| JP2015056756A | 2015-03-23 | |||
| JP2012235402A | 2012-11-29 | |||
| JP2003318701A | 2003-11-07 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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