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AssigneeHitachi Metals, Ltd.
InventorsShigeru Kemmochi, Mitsuhiro Watanabe, Tsuyoshi Taketa, Hiroyuki Tai
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A high-frequency switch circuit common to a plurality or frequency bands comprises a first high-frequency switch connected to first high-frequency signal input and output terminals and adapted to pass transmission signals of a first or a second frequency band and block received signals of the first and second frequency band; and a demultiplexer has a first high-frequency circuit which consists of a first phaser connected to the first terminal and a first bandpss filter succeeding to the first phaser, and a second high-frequency circuit which consists of a second phaser connected to the first terminal and a second bandpass filter succeeding to the second phaser. The transmission line in the first phaser has a line length such that the input impedance of the first high-frequency circuit is substantially open in the pass band of the second bandpass filter, whereas the transmission line in the second phaser has a line length such that the input impedance of the second high-frequency circuit is substantially open in the pass band of the first bandpass filter. Thus, the high-frequency switch circuit passes one of thc received signals of the first and second frequency bands and blocks the other.
A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
A branching circuit module comprising a first high-frequency circuit comprising a first phase shifter connected to a first terminal for inputting and outputting high-frequency signals and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said first terminal, and a second bandpass filter disposed downstream thereof, said first phase shifter and said second phase shifter being contained in a sintered laminate of dielectric green sheets, said first passband filter and said second passband filter being mounted onto said laminate.
Dependencies are inferred from the claim text.