Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2001-07-12
2004-09-07
Corsaro, Nick (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S553100, C455S550100, C455S080000
Reexamination Certificate
active
06788958
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to high-frequency modules and mobile communication apparatuses including high-frequency modules, and more particularly, to a high-frequency module which can be shared by three different communication systems and a mobile communication apparatus including such a high-frequency module.
2. Description of the Related Art
A triple-band portable telephone has been proposed which can operate in a plurality of frequency bands, such as those in a digital cellular system (DCS) using the 1.8 GHz band, a personal communication service (PCS) using the 1.9 GHz band, and a global system for mobile communications (GSM) using the 900 MHz, as a mobile communication apparatus.
FIG. 12
is a block diagram of a front-end section of a general triple-band portable telephone.
FIG. 12
shows a case in which first to third communication systems having frequencies that are different from each other are set to the DCS using the 1.8 GHz, the PCS using the 1.9 GHz, and the GSM using the 900 MHz.
The front-end section of the triple-band portable telephone is provided with an antenna
1
, a diplexer
2
, first to third high-frequency switches
3
a
to
3
c,
first and second LC filters
4
a
and
4
b,
and first to third SAW filters
5
a
to
5
c.
The diplexer
2
couples a transmission signal sent from one of the DCS, the PCS, and the GSM with the antenna
1
during transmission, and distributes a receiving signal sent from the antenna
1
to one of the DCS, the PCS, and the GSM during receiving. The first high-frequency switch
3
a
switches between the transmission-section side of the DCS and the PCS, and the receiving-section side of the DCS and the PCS. The second high-frequency switch
3
b
switches between the receiving section Rxd side of the DCS and the receiving section Rxp side of the PCS. The third high-frequency switch
3
c
switches between the transmission-section Txg side and the receiving section Rxg side of the GSM. The first LC filter
4
a
passes transmission signals for the DCS and the PCS and attenuates the harmonics of the transmission signals. The second LC filter
4
b
passes a transmission signal for the GSM and attenuates the harmonics of the transmission signal. The first SAW filter
5
a
passes a receiving signal for the DCS and attenuates the harmonics of the receiving signal. The second SAW filter
5
b
passes a receiving signal for the PCS and attenuates the harmonics of the receiving signal. The third SAW filter
5
c
passes a receiving signal for the GSM and attenuates the harmonics of the receiving signal.
The operation of the triple-band portable telephone will be described for the DCS first. During transmission, the first high-frequency switch
3
a
turns on the transmission section Txdp side to send a transmission signal that was sent from the transmission section Txdp and that has passed through the first LC filter
4
a,
to the diplexer
2
, the diplexer
2
performs coupling, and then the signal is sent from the antenna
1
. During receiving, a receiving signal received by the antenna
1
is distributed by the diplexer
2
, the receiving signal sent from the antenna
1
is sent to the first switch
3
a,
which is located on the DCS and PCS side, the first high-frequency switch
3
a
turns on the receiving section side to send the signal to the second high-frequency switch
3
b,
and the second high-frequency switch
3
b
turns on the receiving section Rxd side of the DCS to send the signal to the receiving section Rxd of the DCS through the first SAW filter
5
a.
A similar operation is also performed for transmission and receiving for the PCS.
A case in which the GSM is used will be described next. During transmission, the third high-frequency switch
3
c
turns on the transmission section Txg side to send a transmission signal which was sent from the transmission section Txg and has passed the second LC filter
4
b,
to the diplexer
2
, the diplexer
2
performs coupling, and the signal is sent from the antenna
1
. During receiving, a receiving signal received by the antenna
1
is distributed by the diplexer
2
, the receiving signal sent from the antenna
1
is sent to the third high-frequency switch
3
c,
and the third high-frequency switch
3
c
turns on the receiving section Rxg side to send the signal to the receiving section Rxg of the GSM through the third SAW filter
5
c.
Since the triple-band portable telephone, which is one of the conventional mobile communication apparatuses, uses three high-frequency switches, at least six diodes constituting the high-frequency switches are required. As a result, the triple-band portable telephone uses a very large amount of power, and a battery mounted to the triple-band portable telephone can be used only for a short period. Also, the operation of each diode is controlled in many operation modes, and thus, a complicated circuit is required.
SUMMARY OF THE INVENTION
In order to overcome the problems described above, preferred embodiments of the present invention provide a high-frequency module having a low power consumption and a compact circuit, and a mobile communication apparatus including such a high-frequency module.
According to a preferred embodiment of the present invention, a high-frequency module includes integrated front-end sections of first to third communication systems having frequencies that are different from each other, the high-frequency module includes a diplexer arranged to couple a transmission signal sent from any of the first to third communication systems to an antenna during transmission and arranged to distribute a receiving signal sent from the antenna to any of the first to third communication systems during receiving, a first high-frequency switch arranged to separate a transmission section for the first and second communication systems and receiving sections for the first and second communication systems, a SAW duplexer arranged to separate a receiving section for the first communication system and a receiving section for the second communication system, and a second high-frequency switch arranged to separate a transmission section and a receiving section for the third communication system.
The high-frequency module may further include at least one of a first filter arranged to pass a transmission signal sent from the first and second communication systems, a second filter arranged to pass a transmission signal sent from the third communication system, and a third filter arranged to pass a receiving signal for the third communication system.
In the high-frequency module, the SAW duplexer may include a SAW filter and a phase conversion component connected to the SAW filter.
According to another preferred embodiment of the present invention, a high-frequency module includes front-end sections of first to third communication systems having frequencies that are different from each other, the front-end sections including a diplexer arranged to couple a transmission signal sent from any of the first to third communication systems to an antenna during transmission and arranged to distribute a receiving signal sent from the antenna to any of the first to third communication systems during receiving, a first high-frequency switch arranged to separate a transmission section for the first and second communication systems and receiving sections for the first and second communication systems, a SAW duplexer arranged to separate a receiving section for the first communication system and a receiving section for the second communication system, and a second high-frequency switch arranged to separate a transmission section and a receiving section for the third communication system, wherein the diplexer, the first and second high-frequency switches, and the SAW duplexer are integrated in a laminated member including a plurality of laminated sheet layers.
The high-frequency module may be configured such that all elements of the diplexer and a portion of the elements of the first and second high-frequency switches and
Furutani Koji
Harada Tetsuro
Nakajima Norio
Ochii Akihiro
Takada Yoshiki
Corsaro Nick
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Trinh Tan
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