Unbalanced-balanced multiband filter module

A balanced-unbalanced multiband filter module comprising a high-frequency antenna switch for switching the connection of an antenna to a transmitting circuit and the connection of said antenna and a receiving circuit and usable in a multiband mobile phone for the pluralities of communications systems using close frequency bands, said balanced-unbalanced multiband filter module comprising two balanced-unbalanced bandpass filters having different transmitting frequency bands, and six phase shifters connected to said balanced-unbalanced bandpass filter,

• a first phase shifter comprising a first port connected to an unbalanced port of said module, and a second port connected to an unbalanced port of the first balanced-unbalanced bandpass filter;
• a second phase shifter comprising a first port connected to an unbalanced port of said module, and a second port connected to an unbalanced port of the second balanced-unbalanced bandpass filter;
• a third phase shifter comprising a first port connected to the first balanced port of the first balanced-unbalanced bandpass filter, and a second port connected to the first balanced port of said module;
• a fourth phase shifter comprising a first port connected to the second balanced port of the first balanced-unbalanced bandpass filter, and a second port connected to the second balanced port of said module;
• a fifth phase shifter comprising a first port connected to the first balanced port of the second balanced-unbalanced bandpass filter, and a second port connected to the first balanced port of said module;
• and
• a sixth phase shifter comprising a first port connected to the second balanced port of the second balanced-unbalanced bandpass filter, and a second port connected to the second balanced port of said module;
• whereby a high-frequency signal of The first or second communication system input into an unbalanced port of said module is output to said low-noise amplifier from said first and second balanced ports, or a high-frequency signal input of the first or second communication system into said first and second balanced ports is output to said high-frequency amplifier from an unbalanced port of said module.

A balanced-unbalanced multiband filter module comprising a high-frequency antenna switch for switching the connection of an antenna to a transmitting circuit and the connection of said antenna and a receiving circuit and usable in a multiband mobile phone for pluralities of communications systems using close frequency bands, said balanced-unbalanced multiband filter module comprising a high-frequency switch comprising switching element, two balanced-unbalanced bandpass filters having different transmitting frequency bands, and four phase shifters connected to said balanced-unbalanced bandpass filters,

• said high-frequency switch comprising a first port connected to an unbalanced port of said module, a second port connected to an unbalanced port of the first balanced-unbalanced bandpass filter, and a third port connected to an unbalanced port of the second balanced-unbalanced bandpass filter;
• a first phase shifter comprising a first port connected to the first balanced port of the first balanced-unbalanced bandpass filter, and the second port connected to the first balanced port of said module;
• a second phase shifter comprising a first port connected to the second balanced port of the first balanced-unbalanced bandpass filter, and a second port connected to the second balanced port of said module;
• a third phase shifter comprising a first port connected to the first balanced port of the second balanced-unbalanced bandpass filter, and a second port connected to the first balanced port of said module;
• and
• a fourth phase shifter comprising a first port connected to the second balanced port of the second balanced-unbalanced bandpass filter, and a second port connected to the second balanced port of said module;
• said first high-frequency switch being switched depending on a passing high-frequency signal, whereby a high-frequency signal input of the first or second communication system into an unbalanced port of said module is output to said low-noise amplifier from the first and second balanced ports, or a high-frequency signal of the first or second communication system input in to said first and second balanced ports is output to said high-frequency amplifier from an unbalanced port of said module.

A balanced-unbalanced multiband filter module comprising a high-frequency antenna switch for switching the connection of an antenna to transmitting circuit and the connection of said antenna and a receiving circuit and usable in a multiband mobile phone for the pluralities of communications systems using close frequency bands, said balanced-unbalanced multiband filter module comprising two high-frequency switches each comprising a switching element, two balanced-unbalanced bandpass filters having different transmitting frequency bands, and two phase shifters connected to said balanced-unbalanced bandpass filter,

• a first phase shifter comprising a first port connected to an unbalanced port of said module, and a second port connected to an unbalanced port of the first balanced-unbalanced bandpass filter;
• a second phase shifter comprising a first port connected to an unbalanced port of said module, and a second port connected to an unbalanced port of the second balanced-unbalanced bandpass filter;
• a first high-frequency switch comprising a first port connected to the first balanced port of said module, a second port connected to the first balanced port of the first balanced-unbalanced bandpass filter, and a third port connected to the first balanced port of the second balanced-unbalanced bandpass filter;
• a second high-frequency switch comprising a first port connected to the second balanced port of said module, a second port connected to the second balanced port of the first balanced-unbalanced bandpass filter, and a third port connected to the second balanced port of the second balanced-unbalanced bandpass filter;
• said first and second high-frequency switches being switched depending on a passing high-frequency signal, whereby a high-frequency signal input of the first or second communication system into an unbalanced port of said module is output to said low-noise amplifier from the first and second balanced ports, or a high-frequency signal of the first or second communication system input into said first and second balanced ports is output to said high-frequency amplifier from an unbalanced port of said module.