High-frequency circuit apparatus and communication apparatus using the same

A high-frequency circuit apparatus with supportability to a plurality of frequency bands including a band of TDMA method and a band of CDMA method, said apparatus comprising:

• a second high-frequency switch for switching an input send signal between a transmission path of a first communication system of the TDMA method and a transmission path of a seventh communication system of the CDMA method;
• a first low-pass filter for causing attenuation of an unnecessary signal from one send signal as switched by said second high-frequency switch;
• a first duplexer having a first port, a second port and a third port, for outputting to the second port a remaining send signal which is input from the first port and switched by said second high-frequency switch while applying thereto wave separation with a received signal different in frequency from the send signal and for outputting to the third port a received signal of said first communication system to be input from the second port and a received signal of said seventh communication system, which are in the same frequency band;
• and
• a first high-frequency switch for switching a received signal as input from an antenna terminal to the second port of said first duplexer and for switching to said antenna terminal both said send signal which is wave-separated by said first duplexer and is output from said second port and a send signal as output from said first low-pass filter.

A high-frequency circuit apparatus with supportability to a first communication system, a second communication system, a third communication system and a fourth communication system which comply with a TDMA method and also to a fifth communication system, a sixth communication system and a seventh communication system which comply with a CDMA method, said apparatus comprising:

• a fifth high-frequency switch having an antenna port connected to an antenna terminal, first to third signal transmission/reception ports, first and second signal transmission ports and first and second signal reception ports, for switching a received signal received via said antenna port to said first to third signal transmission/reception ports or said first and second signal reception ports and for switching a send signal to be input from said first to third signal transmission/reception ports or said first and second signal transmission ports to the antenna port;
• a second high-frequency switch for switching send signals of said first communication system, said second communication system and said seventh communication system to a signal transmission path in common for said first communication system and said second communication system and a signal transmission path of said seventh communication system;
• a first low-pass filter connected to one signal transmission path of said second high-frequency switch and the first signal transmission port of said fifth high-frequency switch, for attenuating an unnecessary signal from an output signal of said second high-frequency switch;
• a fourth high-frequency switch for switching send signals of said third communication system, said fourth communication system and said sixth communication system to a signal transmission path in common to said third communication system and said fourth communication system and a signal transmission path of said fifth communication system and also a signal transmission path of said sixth communication system;
• a second low-pass filter connected to a remaining signal transmission path of said fourth high-frequency switch and the second signal transmission port of said fifth high-frequency switch, for attenuating an unnecessary signal from an output signal of said fourth high-frequency switch;
• a first duplexer connected to the first signal transmission/reception port of said fifth high-frequency switch and the signal transmission path of said fourth high-frequency switch which is in common to the third and fourth communication systems, for performing wave separation of a send signal from said second high-frequency switch and a received signal different in frequency from such the send signal and for outputting via the same signal reception path a received signal of said first communication system and a received signal of said seventh communication system, which are of the same frequency band;
• a second duplexer connected to the third signal transmission/reception port of said fifth high-frequency switch and the signal transmission path of the fifth communication system of said fourth high-frequency switch, for separating only a received signal of said fifth communication system from the received signal as received from said third signal reception port, for outputting it to a signal reception path, and for outputting the received signal of said fifth communication system to the third signal transmission/reception port of said fifth high-frequency switch;
• a third duplexer connected to the second signal transmission/reception port of said fifth high-frequency switch and the signal transmission path of said sixth communication system of said fourth high-frequency switch, for performing separation of a send signal and a received signal of said sixth communication system which are different in frequency band from each other and for making equal the received signal of said fourth communication system and the received signal of said sixth communication system, which are the same in frequency band as each other;
• a first SAW filter connected to the first signal reception port of said fifth high-frequency switch, for permitting passage of only the received signal of said third communication system from those received signals as received via said first signal reception port;
• and
• a second SAW filter connected to the second signal reception port of said fifth high-frequency switch, for permitting pass-through of only the received signal of said second communication system from those received signals being received through said second signal reception port.