JP3258922B2 - Dual band wireless communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FDD (Frequency Division Duplex) type dual-band wireless communication apparatus that performs transmission and reception using two frequency bands and using different frequencies in each frequency band.

[0002]

2. Description of the Related Art In recent years, various wireless communication devices such as portable telephone devices have become widespread. These wireless communication devices include:
There are a plurality of different communication systems depending on the standard. For example, in an FDD wireless communication apparatus that uses different frequencies for uplink and downlink, an AMPS (Advanced Mobile Phone Servic
e) and US P using digital 1.9 GHz band
CS (Personal Communications Services) and PDC (Personal Digit using digital 1.5GHz band)
al Cellular).

[0003] Normally, a wireless communication device is compatible with any one standard, but recently, a dual-band wireless communication device compatible with two standards has been desired. FIG. 7 is a block diagram showing a configuration of a conventional dual-band wireless communication device. This dual-band wireless communication device has 800
It is configured to switch between the AMPS in the MHz band and the PCS in the 1.9 GHz band.

A baseband unit 518 shown in FIG. 1 performs input / output processing of a baseband signal and control processing of each unit. More specifically, as input / output processing of a baseband signal, the baseband unit 518 outputs a baseband signal to the transmission unit 512 or the transmission unit 514 via the switch 516 during transmission, and receives the reception unit 513 or Receiver 515
Is input via a switch 517. As a control process of each unit, the baseband unit 518 includes:
The following control signal is used for processing.

The selection signals 519 and 520 are set to 800 MHz
Switch 51 according to the band or the 1.9 GHz band.
6. Signals for controlling the selection of the switch 517. The control signal group 521 includes a power-on signal for controlling the power on / off of the transmission unit 512 in accordance with the transmission timing;
Similarly, a power-on signal to the transmission unit 514, a level control signal for adjusting the transmission level of the transmission unit 512 or the transmission unit 514 according to the distance from the base station (reception field strength signal), and a monitor signal for monitoring the transmission level And a stabilization control signal for stabilizing the transmission level based on the result of comparison between the monitor signal and the reference value.

[0006] The control signal group 522 is transmitted to the receiving unit 513.
Power-on signal for controlling power-on / off of the
5 includes a power-on signal for controlling power-on / off of A.5, an AGC signal for adjusting a reception level, and the like. With these control signals, the dual-band wireless communication device can
When using the 00 MHz band, the baseband signal from the baseband unit 518 is transmitted to the switch 51 during transmission.
6 is output to the transmission unit 512, is modulated and amplified by the transmission unit 512, and is a low-pass filter (hereinafter, LPF).
The signal is output from the antenna 501 through 506, 503, and 502, and the signal received from the antenna during reception is
LPFs 502 and 503 and a high-pass filter (hereinafter HP)
F) The signal is amplified and demodulated by the receiving unit 513 through 507, and is input to the baseband unit 518 via the switch 517. The same applies to transmission and reception in the 1.9 GHz band.

[0007] Filter groups 505, 508, 511
Each filter has a frequency characteristic as shown in FIG. 8 in order to separate the transmission frequency and the reception frequency in each frequency band. In the figure, the horizontal direction (horizontal axis outside the figure) is the frequency, and the vertical direction (vertical axis outside the figure) is the filter pass rate.
X1 is the transmission frequency, reception frequency, and TX of 800 MHz.
2. RX2 is a transmission frequency and a reception frequency of 1.9 GHz. The characteristic curve of each filter is given the same reference numeral as the filter. At the time of transmission and reception, this filter group
The transmission frequency and the reception frequency are separated.

[0008]

However, according to the configuration of the conventional dual band wireless communication apparatus, the 800 MHz transmitting unit 512 and the receiving unit 513 on the printed circuit board are replaced with the 1.9 GHz band transmitting unit 514 and the receiving unit. Since 515 and 515 are arranged as integral communication modules, it is necessary to distribute the control signal group 521 from the baseband unit to both transmitting units and the control signal group 522 to both receiving units. There is a problem that the wiring patterns intersect on the printed circuit board in a complicated manner.

As a result, it is difficult to design a wiring pattern on a printed circuit board, it is necessary to increase the board area in order to secure the wiring pattern, and furthermore, the electrical characteristics such as crosstalk are reduced. There was a problem of deterioration. The present invention has been made in view of the above problems,
An object of the present invention is to provide a dual-band wireless communication device that can improve a wiring pattern of a control signal group and is suitable for downsizing.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, a dual band radio communication apparatus according to the present invention has a first configuration.
A first transmitting unit and a first receiving unit for transmitting and receiving in the second frequency band, and a second transmitting unit and a second receiving unit for transmitting and receiving in the second frequency band. The first and second receivers are arranged adjacent to each other on a printed circuit board.

Further, the dual band wireless communication apparatus may be configured such that a first filter group is interposed between both transmitting units and an antenna, and a second filter group is interposed between both transmitting units. Good. Here, the dual-band wireless communication apparatus selectively amplifies output signals of the first and second transmission units and outputs the amplified signals to the first filter group. A configuration including a transmission high-frequency amplifier may be adopted.

The dual-band wireless communication device amplifies a signal received from the second filter group and selectively supplies the signal to the first and second receiving units.
It is also possible to adopt a configuration in which a receiving high-frequency amplifying unit is also used in the frequency band described above.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> FIG. 1 is a block diagram showing a configuration of a dual band wireless communication apparatus according to a first embodiment of the present invention. This dual-band wireless communication apparatus includes an antenna 101 for transmitting and receiving a radio signal, an LPF 102,
A transmission / reception filter group 105 composed of an LPF 103 and an HPF 104, a transmission filter group 108 composed of an LPF 106 and an HPF 107, an LPF 109 and an HPF 110
A filter group 111 for reception comprising: a baseband signal modulated and amplified, and output to the LPF 106 800
A transmitting unit 112 for the MHz band, a transmitting unit 113 for the 1.9 GHz band that modulates and amplifies the baseband signal and outputs it to the LPF 107, and a transmitting unit 112 for the 800 MHz band that amplifies and demodulates the received signal input via the LPF 109. Receiving unit 1
14, a 1.9 GHz band receiving section 115 for amplifying and demodulating a received signal input via the LPF 110, a switch 116 for switching to which transmitting section a baseband signal for transmitting is supplied, and a receiving section. A switch 117 for switching the baseband signal demodulated by the switch 117 and supplying the baseband signal to the baseband unit 118, and a baseband unit 118 for input / output processing of the baseband signal and control processing of each unit. AMP
S and the 1.9 GHz band PCS are used by switching.

The baseband unit 118 outputs a baseband signal to the transmitting unit 112 or 114 via the switch 116 at the time of transmission, and receives or transmits the baseband signal at the time of reception.
Is input via the switch 117. As a control process of each unit, the baseband unit 118
The following control signal is used for processing.

The selection signals 119 and 120 are 800 MHz
Switch 11 according to the band or the 1.9 GHz band.
6. Signals for controlling the selection of the switch 117. The control signal group 121 includes a power-on signal for controlling the power on / off of the transmission unit 112 in accordance with the transmission timing,
Similarly, a power-on signal to the transmission unit 113, a level control signal for adjusting the transmission level of the transmission unit 112 or the transmission unit 113 according to the distance from the base station (reception field strength signal), and a monitor signal for monitoring the transmission level And a stabilization control signal for stabilizing the transmission level based on the result of comparison between the monitor signal and the reference value.

The control signal group 122 includes a power-on signal for controlling the power on / off of the receiver 114, a power-on signal for controlling the power on / off of the receiver 115, an AGC signal for adjusting the reception level, and the like. Consists of Filter group 1
Each of the filters 05, 108 and 111 has a frequency characteristic as shown in FIG. 2 in order to separate the transmission frequency and the reception frequency in each frequency band. In the figure, the horizontal direction (horizontal axis outside the figure) is the frequency, and the vertical direction (vertical axis outside the figure) is the filter pass rate. Transmission frequency and reception frequency. The characteristic curve of each filter is given the same reference numeral as the filter. When sending and receiving,
The transmission frequency and the reception frequency are separated by this filter group. Further, the filters 106, 107, 10
8 and 110 are arranged on the printed circuit board by the transmitting unit 112,
113, and are mounted at positions adjacent to the receiving units 114 and 115, respectively.

FIG. 3 shows a layout example on a printed circuit board of the dual band wireless communication apparatus of FIG. In the figure, the arrangement area B1 indicated by a broken line is a baseband section 118,
This is an area where the switches 116 and 117 are mounted, and the arrangement areas S1, S2, R1, R2, F1, F2, F
3 is a transmitting unit 112, a transmitting unit 113, and a receiving unit 1
14, receiving unit 115, filter group 108, filter group 1
11, an area where the filter group 105 is mounted. Each area includes both sides of the printed circuit board.

As shown in FIG. 1, the arrangement areas S1 and S2 are arranged at adjacent positions, and the arrangement areas R1 and R2 are arranged at adjacent positions. Since the circuit configurations of the two transmitting units and the two receiving units are well known in the art, description thereof will be omitted, and here, a mounting form on a printed circuit board will be described. The placement areas S1 and S2 on the printed circuit board include resistors, capacitors,
The total number of components including small chip components such as coils is 10
About 0 to 200, of which the main parts,
The number of IC or LSI components of about 20 pins is 1
It is about 0 or several. The same applies to the arrangement regions R1 and R2. As described above, the mounting areas of both transmitting units are provided at adjacent positions, and the mounting areas of both receiving units are also provided at adjacent positions.

By such mounting, the baseband unit 1
The control signal groups 121 and 122 from 18 are
Since the receiving units are arranged adjacent to each other, the complicated intersection of the wiring patterns is eliminated. Further, since the wiring length is shortened, deterioration of electrical characteristics such as crosstalk can be suppressed, and the area occupied by the wiring pattern is reduced, which is suitable for miniaturization of the device.

The HPF 104 and the filter group 111
Is a filter dedicated to reception, and therefore, a component having a smaller rated value, that is, a component with lower power durability, than other filters can be used. <Second Embodiment> FIG. 4 is a block diagram showing a configuration of a dual band wireless communication apparatus according to a second embodiment of the present invention. In the same figure, the components denoted by the same reference numerals as those in FIG. 1 are the same and will not be described, and the following description will focus on the differences.

The present dual-band wireless communication apparatus uses a modulating section 40 instead of transmitting section 112 and transmitting section 113 in FIG.
1, a modulation unit 402, a switch 403, an amplifier 404, a switch 405, and a switch 406.
14, a configuration in which an amplifier 407, a switch 408, a demodulation unit 409, and a demodulation unit 410 are provided instead of the reception unit 115.

The modulation sections 401 and 402 each have 800
This is a modulation unit for the MHz band and the 1.9 GHz band. The switches 403 and 405 are switched according to the frequency band under the control of the selection signal 119, similarly to the switch 116.
The amplifier 404 is a high-frequency amplifier (high power amplifier) for both the 800 MHz band and the 1.9 GHz band.
It is.

The demodulation units 409 and 310
A demodulation unit for the MHz band and the 1.9 GHz band. The switches 403 and 405 are switched according to the frequency band under the control of the selection signal 120, similarly to the switch 117.
The amplifier 407 is a high-frequency amplifier (low-noise amplifier) for both the 800-MHz band and the 1.9-GHz band.
It is.

The arrangement of the dual band wireless communication apparatus in the present embodiment on the printed circuit board is the same as that shown in FIG. That is, the modulators 401 and 402 are arranged adjacent to each other, and the switches 403 and 404 are arranged adjacent to each other. As described above, in the present embodiment, the amplifier 404 and the amplifier 407 are also used as compared with the configuration of the first embodiment, so that the circuit scale can be further reduced and a configuration more suitable for miniaturization of the device can be achieved. Has become. In addition, the cost can be reduced because the four amplifiers are replaced by two amplifiers.

<Third Embodiment> An embodiment in which the combination of the frequency bands is different from the above embodiment will be described. FIG.
FIG. 11 is a block diagram illustrating a configuration of a dual band wireless communication device according to a third embodiment of the present invention. The configuration in the figure is
It is configured to switch between the 800 MHz band AMPS and the 1.5 GHz band PDC. Therefore, each filter of the filter groups 305, 308, and 411 has the frequency characteristics shown in FIG. The mounting form on the printed circuit board having the configuration shown in FIG.

The filter 304 of FIG. 5 can use a more gradual bandpass characteristic (a characteristic of a gradual curve of FIG. 6) than the filter 104 of FIG. That is, a filter including a smaller number of circuit elements can be used. As described above, the dual-band wireless communication apparatus of the present invention is arranged such that the transmission units and the reception units are adjacent to each other on the printed circuit board. Wiring can be performed without complicated wiring patterns of the group. As a result, the wiring length is shortened, and the area required for wiring is reduced, so that wiring design is facilitated and the device is suitable for miniaturization of the device.

In the above embodiment, the AMPS, PC
Although the dual band wireless communication apparatus in which the frequency bands according to the S and PDC standards are combined has been described as a specific example, a frequency band other than these may be used.

[0028]

According to the present invention, there is provided a dual-band radio communication apparatus comprising: a first transmitting section and a first receiving section for transmitting and receiving in a first frequency band; a second transmitting section for transmitting and receiving in a second frequency band; A dual-band wireless communication device having a second receiving unit, wherein the first and second transmitting units are arranged adjacent to each other on a printed circuit board, and the first and second transmitting units are arranged adjacent to each other. I have. According to this configuration, both transmitting units,
Wiring can be performed without complicated wiring patterns of the control signal group to both receivers. As a result, the wiring length is shortened, and the area required for wiring is reduced, so that the wiring design is facilitated, which is suitable for miniaturization of the device.

The dual-band radio communication apparatus is configured such that a first filter group is interposed between both transmitting units and an antenna, and a second filter group is interposed between both receiving units. According to this configuration, the second filter group is composed of only unidirectional filters dedicated to reception, so that bidirectional filters can be reduced. For example, FIG.
Although the bidirectional filters 502, 503, and 504 are required in FIG. 1, only the filter 102 is bidirectional in FIG. 1 and the others are unidirectional. Further, the receiving filter may have lower power durability than the transmitting filter, so that the cost can be reduced.

The dual-band radio communication apparatus may selectively amplify output signals of the first and second transmitting units and output the amplified signals to the first filter group. A transmission high-frequency amplifier is also provided. further,
The dual band wireless communication apparatus amplifies a reception signal from the second filter group and selectively supplies the amplified signal to the first and second reception units. High frequency amplifying unit for use.

According to these configurations, since the transmitting high-frequency amplifier and / or the receiving high-frequency amplifier are also used,
The circuit scale can be further reduced, and the configuration is more suitable for miniaturization of the device. In addition, the cost can be reduced by reducing the number of amplifiers.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a dual band wireless communication device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing filter groups 105 and 10 in the embodiment.
It is a frequency characteristic figure of each filter of 8 and 111.

FIG. 3 shows a layout example on a printed circuit board of the dual-band wireless communication device according to the embodiment.

FIG. 4 is a block diagram illustrating a configuration of a dual band wireless communication device according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a dual band wireless communication device according to a third embodiment of the present invention.

FIG. 6 is a view showing a group of filters 305 and 30 in the embodiment.
It is a frequency characteristic diagram of each of 8 and 311 filters.

FIG. 7 is a block diagram illustrating a configuration of a conventional dual-band wireless communication device.

FIG. 8 is a frequency characteristic diagram of each filter of the filter groups 505, 508, and 511.

[Explanation of symbols]

 101 antenna 105 filter group 108 filter group 111 filter group 112 transmitting section 113 receiving section 113 transmitting section 114 receiving section 114 transmitting section 115 receiving section 116 switch 117 switch 118 baseband section 119 selection signal 120 selection signal 121 control signal group 122 control signal group

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/40 H04B 1/06 H04B 1/16

Claims (4)

(57) [Claims] 1. A first transmission / reception system in a first frequency band.
Transmission unit and the first reception unit in the second frequency band
A data transmission / reception unit having a second transmission unit and a second reception unit.
A dual-band wireless communication device,  The first and second transmitters are connected to each other and the first and second receivers are connected to each other.
Placed adjacent to the lint board, The dual-band wireless communication device, Mounted on the printed circuit board adjacent to the first transmitter
Adjacent to the transmitting low-pass filter and the second transmitting unit
From the high-pass filter for transmission mounted at the position
And a first fan mounted in one area on the printed circuit board.
Yilta group, Mounted on the printed board adjacent to the first receiver
Adjacent to the receiving low-pass filter and the second receiving unit
From the high-pass filter for reception mounted at the position
And a second mounted in another area on the printed circuit board.
Filter group Dual van
Wireless communication device. 2. The dual band wireless communication device according to claim 1 ,
Further, the antenna is disposed between the first and second filter groups and the antenna.
And a transmission low-pass filter connected downstream of the first filter group.
Receiver connected before the filter and the second filter group
Transmission / reception filter group consisting of
Mu dual band according to claim 2, wherein the obtaining
Line communication device. 3. The first and second frequency bands, wherein the dual-band wireless communication apparatus selectively amplifies output signals of first and second transmission units and outputs the amplified signals to the first filter group. dual-band radio communication apparatus according to claim 1, wherein further comprising a transmitting high-frequency amplification section of the alternate. 4. The first and second frequencies, wherein the dual-band wireless communication device amplifies a received signal from the second filter group and selectively supplies the amplified signal to the first and second receiving units. 4. The dual-band wireless communication apparatus according to claim 1, further comprising a receiving high-frequency amplifying unit for the band.