High-frequency circuit apparatus and communication apparatus using the same

Abstract

A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.

1 . A high-frequency circuit apparatus responsive to send and received signals of a first modulation method and a second modulation method, said apparatus comprising:
 a duplexer for performing wave separation of send and received signals as input thereto; and   a filter for filtering the input send signal, wherein   upon inputting of the send and received signals of said first modulation method, the send signal and the received signal of said first modulation method are wave-separated and output by said duplexer, and   upon inputting of the received signal of said second modulation method, the received signal of said second modulation method is wave-separated by said duplexer whereas the send signal of said second modulation method is filtered by said filter.   
   
   
       2 . The high-frequency circuit apparatus according to  claim 1 , wherein said first modulation method is a code division multiple access method, and said second modulation method is a time division multiple access method. 
   
   
       3 . The high-frequency circuit apparatus according to  claim 1 , wherein the signal of said first modulation method and the signal of said second modulation method are substantially the same in frequency band as each other. 
   
   
       4 . A high-frequency circuit apparatus responsive to send and received signals of a first modulation method and a second modulation method, said device comprising:
 a duplexer for performing wave separation of a send signal and a received signal of said first modulation method and for performing separation of a received signal of said second modulation method; and   a filter for filtering the send signal of said second modulation method.   
   
   
       5 . 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.   
   
   
       6 . The high-frequency circuit apparatus according to  claim 5 , wherein a signal of the TDMA method as input from the antenna terminal and a signal of the CDMA method are output via said first duplexer to an external circuit. 
   
   
       7 . The high-frequency circuit apparatus according to  claim 5 , further comprising:
 a diplexer for transmitting toward an antenna a send signal of one of said first communication system and a third communication system each being the TDMA method and said seventh communication system being the CDMA method and for performing, in a signal reception event, wave separation of a signal of a first frequency in the frequency band of said first communication system and said seventh communication system and a signal of a second frequency of said third communication system being in a frequency band higher than said first frequency, wherein   said first high-frequency switch switches the signal of said first frequency as output from said diplexer to said first duplexer and for switching an output signal of said first low-pass filter to said diplexer.   
   
   
       8 . The high-frequency circuit apparatus according to  claim 7 , further comprising:
 a second low-pass filter for attenuation of an unnecessary signal being contained in the send signal of said third communication system;   a third high-frequency switch for switching the signal of said second frequency as separated by said diplexer to a signal reception path and for switching a signal as output from said second low-pass filter to said diplexer; and   a first surface acoustic wave (SAW) filter for permitting passage of only a received signal of said third communication system from the signal being output from said third high-frequency switch to the signal reception path.   
   
   
       9 . The high-frequency circuit apparatus according to  claim 7 , further comprising:
 a second duplexer for performing wave separation of a received signal of a fifth communication system included in said second frequency separated by said diplexer to thereby route this signal to the signal reception path and for causing a send signal of said fifth communication system to pass therethrough toward said diplexer.   
   
   
       10 . The high-frequency circuit apparatus according to  claim 7 , wherein said diplexer further transmits to the antenna a send signal of one of said first communication system and a fourth communication system each of which is the TDMA method and a sixth communication system and said seventh communication system each of which is the CDMA method and for performing, in a signal reception event, wave separation of the signal of said second frequency including both said first frequency and frequency bands of said fourth communication system and said sixth communication system, and wherein said apparatus further comprises:
 a fourth high-frequency switch for switching between a signal transmission path of said fourth communication system and a signal transmission path of said sixth communication system,   a second low-pass filter for attenuation of an unnecessary signal of a signal to be output from said fourth high-frequency switch,   a third duplexer for performing wave separation of a send signal of said fifth communication system or said sixth communication system and a received signal different in frequency band from such the send signal and for causing signal reception paths of respective received signals of the fourth and sixth communication systems, which are in the same frequency band, to be the same as each other, and   a third high-frequency switch for switching the signal of said second frequency as output from said diplexer to said third duplexer and for switching an output signal of said second low-pass filter to said diplexer.   
   
   
       11 . The high-frequency circuit apparatus according to  claim 7 , wherein said diplexer further transmits to the antenna a send signal of one of the first to fourth communication systems of the TDMA method and the fifth to seventh communication systems of the CDMA method, and for performing, in a signal reception event, wave separation of the signal of said first frequency including frequency bands of the first, second and seventh communication systems and the signal of said second frequency including frequency bands of the third to sixth communication systems, wherein
 said second high-frequency switch performs switching between a signal transmission path in common for the first and second communication systems and a signal transmission path of said seventh communication system,   said first low-pass filter causes attenuation of an unnecessary signal contained in send signals of said first and second communication systems to be output from said second high-frequency switch,   said first high-frequency switch switches the signal of said first frequency as output from said diplexer to either said first duplexer or the signal reception path of said second communication system and for switching the output signal of said first low-pass filter to said diplexer, and   said apparatus further comprises,   a fourth high-frequency switch for switching a signal transmission path being common to said third communication system and said fourth communication system, a signal transmission path of said fifth communication system, and a signal transmission path of said sixth communication system,   a second low-pass filter connected to one of the signal transmission paths to be switched by said fourth communication system, for attenuating an unnecessary signal of the send signal to be output from said fourth high-frequency switch,   a second duplexer for separating to a signal reception path the received signal of said fourth communication system contained in said second frequency separated by said diplexer and for causing the send signal of said fourth communication system to pass therethrough toward said diplexer,   a third duplexer for performing wave separation of a send signal of either said fourth communication system or said sixth communication system and a received signal different in frequency band from such the signal and for causing signal reception paths of received signals of the fifth and sixth communication systems, which are in the same frequency band, to be the same as each other,   a third high-frequency switch for switching the signal of said second frequency as output from said diplexer to one of said second duplexer, said third duplexer and the signal reception path of said third communication system or for switching the output signal of said second low-pass filter to said diplexer,   said first SAW filter for filtering a signal to be output from said third high-frequency switch to thereby permit only a received signal of said third communication system to pass therethrough, and   a second SAW filter for filtering a signal being output from said first high-frequency switch to thereby permit only a received signal of said second communication system to pass therethrough.   
   
   
       12 . The high-frequency circuit apparatus according to  claim 7 , wherein said diplexer attenuates either an unnecessary signal contained in the send signal of said first communication system or said second communication system or said seventh communication system or an unnecessary signal to be generated from said first high-frequency switch. 
   
   
       13 . The high-frequency circuit apparatus according to  claim 11 , wherein said first duplexer, said first SAW filter, said second SAW filter, said second duplexer and said third duplexer have output nodes each being formed of a single output. 
   
   
       14 . The high-frequency circuit apparatus according to  claim 13 , further comprising:
 a first matching circuit for providing matching between said first duplexer and the external circuit;   a second matching circuit for providing matching between said first SAW filter and the external circuit;   a third matching circuit for providing matching between said second SAW filter and the external circuit;   a fourth matching circuit for providing matching between said second duplexer and the external circuit; and   a fifth matching circuit for providing matching between said third duplexer and the external circuit.   
   
   
       15 . 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.   
   
   
       16 . A communication apparatus comprising:
 a receiver unit for receiving a signal;   the high-frequency circuit apparatus as defined in  claim 1 , for processing the signal received by said receiver unit; and   an output unit for outputting a signal as processed by said high-frequency circuit apparatus.   
   
   
       17 . A communication apparatus comprising:
 a receiver unit for receiving a signal;   the high-frequency circuit apparatus as defined in  claim 4 , for processing the signal received by said receiver unit; and   an output unit for outputting a signal as processed by said high-frequency circuit apparatus.   
   
   
       18 . A communication apparatus comprising:
 a receiver unit for receiving a signal;   the high-frequency circuit apparatus defined in  claim 15 , for processing the signal received by said receiver unit; and   an output unit for outputting a signal as processed by said high-frequency circuit apparatus.