Bypass filter, multi-band antenna switch circuit, and layered module composite part and communication device using them

A multiband antenna switch circuit comprising a diplexer connected to an antenna terminal for branching signals having different passbands;

• a first switch circuit for switching lower-frequency signals branched by said diplexer to plural transmitting/receiving terminals;
• a second switch circuit for switching higher-frequency signals branched by said diplexer to plural transmitting/receiving terminals;
• a first lowpass filter connected to a transmitting line between said diplexer and said transmission terminal or between said first switch circuit and said transmission terminal;
• a second lowpass filter connected to a transmitting line between said diplexer and said transmission terminal or between said second switch circuit and said transmission terminal;
• and a notch filter disposed between said diplexer and said first switch circuit and/or between said diplexer and said second switch circuit.

A multiband antenna switch circuit comprising a diplexer connected to an antenna terminal for branching signals having different passbands;

• a first switch circuit for switching lower-frequency signals branched by said diplexer to a first transmission terminal and a first receiving terminal;
• a second switch circuit for switching higher-frequency signals branched by said diplexer to a second transmission terminal, a second receiving terminal and a third transmitting/receiving terminal;
• a first lowpass filter connected to a transmitting line between said diplexer and said first transmission terminal or between said first switch circuit and said first transmission terminal;
• and a second lowpass filter connected to a transmitting line between said diplexer and said second transmission terminal or between said second switch circuit and said second transmission terminal, said diplexer and said second switch circuit being connected to each other via a notch filter.

A multiband antenna switch circuit comprising a diplexer for branching signals having different passbands;

• a first switch circuit for switching lower-frequency signals branched by said diplexer to plural transmitting/receiving terminals;
• a second switch circuit for switching higher-frequency signals branched by said diplexer to plural transmitting/receiving terminals;
• a first lowpass filter connected to a transmitting line between said diplexer and a transmission terminal or between said first switch circuit and said transmission terminal;
• and a second lowpass filter connected to a transmitting line between said diplexer and said transmission terminal or between said second switch circuit and said transmission terminal, wherein a notch filter is connected between said diplexer and said antenna terminal.

A multiband antenna switch circuit comprising a diplexer for branching signals having different passbands;

• a first switch circuit for switching lower-frequency signals branched by said diplexer to a first transmission terminal and a first receiving terminal;
• a second switch circuit for switching higher-frequency signals branched by said diplexer to a second transmission terminal, a second receiving terminal and a third transmitting/receiving terminal;
• a first lowpass filter connected to a transmitting line between said diplexer and said first transmission terminal or between said first switch circuit and said first transmission terminal;
• and a second lowpass filter connected to a transmitting line between said diplexer and said second transmission terminal or between said second switch circuit and said second transmission terminal, wherein a notch filter is connected between said diplexer and said antenna terminal.

A multiband antenna switch circuit comprising

• a notch filter connected between a switch circuit and an antenna terminal;
• (b) said switch circuit comprising at least a connection terminal connected to said notch filter, a first transmitting/receiving terminal and a second transmitting/receiving terminal;
• (c) a first diplexer comprising a first common terminal connected to said first transmitting/receiving terminal, a first transmitting terminal and a second receiving terminal;
• and
• (d) a second diplexer comprising a second common terminal connected to said second transmitting/receiving terminal, a second transmitting terminal and a first receiving terminal.