JPH0476251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless device for simultaneous transmission and reception used in mobile communications.

[Conventional technology]

In recent years, telephones using mobile radio devices have become widespread, and one form of usage is that they are commonly used for both portable and fixed telephones. In other words, when a person carries it around, it is used as a portable device with a low power transmitting output of about 0.5 to 1 W, and when used as a stationary device on a tabletop or in a car, a booster is used to increase the transmitting output to about 5 to 20 W. It is often used.

FIG. 2 is a block diagram showing a conventional radio device and booster in such a usage mode.

When used as a portable simultaneous reception radio device, transmission and reception are performed only by the radio device 13.
That is, a transmission signal inputted from the high frequency input terminal 1 passes through the excitation section 2, is power amplified by the power amplification section 3, and is sent out to the antenna input/output terminal 6 through the duplexer 4. Further, a received signal is inputted from the antenna input/output terminal 6, passes through the duplexer 4, and is transmitted to the receiving section 5. Note that the excitation section 2 here is an amplification means for making the transmission signal from the high frequency input terminal 1 optimal as an input signal to the power amplification section 3.

On the other hand, when used as a fixed radio device for simultaneous transmission and reception, a booster 14 including a circulator 8, a power amplification section 9, a duplexer 10, and an RF amplifier 11 is connected to the radio device 13 to perform transmission and reception.

That is, the antenna input/output terminal 6 of the radio device 13
When a transmission signal is input from the high frequency input terminal 1 with the booster 14 connected to the input/output terminal 7 of the booster 14, the transmission signal is transmitted to the input/output terminal 7 via the excitation section 2, the power amplification section 3, and the duplexer 4. Then, the signal passes through the circulator 8, is amplified in power by the power amplification section 9, and is sent out to the antenna input/output terminal 12 through the duplexer 10.

Conversely, the received signal enters from the antenna input/output terminal 12, passes through the duplexer 10, is amplified by the RF amplifier 11, is output from the circulator 8 to the input/output terminal 7, and is received via the antenna input/output terminal 6 and the duplexer 4. This will be communicated to Department 5.

[Problem that the invention seeks to solve]

However, according to the above-mentioned conventional technology, the radio device 13
The transmission signal output from the booster 14 is directly transmitted from the booster 14.
If you try to amplify the power by inputting it to the booster 14, a level higher than necessary may be input to the power amplifying unit 9 because it has been amplified once by the power amplifying unit 3. In such a case, an attenuator or the like is installed on the input side of the booster 14. must be inserted. Furthermore, according to the conventional configuration, the circulator 8 and the duplexer 10 are indispensable, which is a key to cost reduction. In addition, the circulator 8 needs impedance matching with the circuits before and after it, and if matching cannot be achieved, there is a drawback that the amount of isolation between transmission and reception decreases. Note that if a duplexer is used in place of the circulator 8, the problem of impedance matching can be solved, but since a duplexer is more expensive than a circulator, it is difficult to adopt it in terms of cost performance.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a wireless device that connects a booster to a portable wireless device and uses it as a tabletop or car-mounted wireless device. An object of the present invention is to provide a wireless device that does not require the insertion of an attenuator when connecting a booster and a wireless device, and is inexpensive compared to conventional devices.

[Means for solving problems]

In order to achieve such an object, the present invention provides a portable radio device with an input terminal, an output terminal, and a first device that outputs a transmission signal to either the power amplification section or the output terminal inside the portable radio device. a changeover switch, and a second switch that outputs a signal from either the power amplification section or the input terminal to the duplexer.
a changeover switch, the booster has an input terminal connected to the output terminal of the portable radio, an output terminal connected to the input terminal of the portable radio, and a booster that amplifies the signal from the input terminal. and a power amplification section that outputs to the output terminal.

[Effect]

By switching the switch, when connecting the booster to a portable radio and using it for desktop or car use, the transmitted signal is directly amplified inside the booster without passing through the power amplification section inside the portable radio. section. Furthermore, the connection between the portable radio and the booster is made only in the transmission system of the portable radio.

〔Example〕

Hereinafter, the present invention will be explained in detail together with examples.
FIG. 1 is a block diagram showing one embodiment of the present invention, and the same or corresponding parts as in FIG. 2 are given the same reference numerals.

First, the configuration of the portable radio device 21 that can transmit and receive calls simultaneously will be explained.

The high frequency input terminal 1 is connected to the input terminal of a first changeover switch 15 by a signal line 1a, and the two output signal lines 15a and 15b of the changeover switch 15 extend to the excitation section 2 and the output terminal 16, respectively. The selector switch 15 has a function of selectively outputting the signal from the signal line 1a to either the output signal line 15a or 15b by manual operation.

The output signal line 2a of the excitation section 2 extends to the power amplification section 3, and the output signal line 3a of the power amplification section 3 extends to the second changeover switch 16. Other signal lines 16a and 18a connected to the changeover switch 16 extend to the duplexer 4 and the input terminal 18, respectively.
selectively outputs the signal from the signal line 3a or the signal line 18a to the signal line 16a by a switching operation.

Two other signal lines 4a connected to the duplexer 4,
4b extends to the receiving section 5 and the antenna input/output terminal 6. The duplexer 4 is a type of filter, and outputs the transmission signal from the signal line 16a to the signal line 4b, and outputs the reception signal input from the signal line 4b to the signal line 4a.

Next, the configuration of the booster 22 will be explained.

The input terminal 19 is connected to the input terminal of the power amplifying section 9 by a signal line 19a. The power amplification section 9 has a higher amplification factor than the power amplification section 3 in the portable radio device 21, and the output signal line 9 of the power amplification section 9
a extends to the output terminal 20.

Next, the operation of this embodiment will be explained.

First, a case where the device is used as a portable wireless device will be described. In this case, booster 22 is not used.

Manually operate the changeover switches 15 and 16 to connect the signal line 1a, the signal line 15a, and the signal line 3.
a and the signal line 16a, respectively, and the signal line 15b and the signal line 18 at each changeover switch.
Separate a. With this operation, the portable radio 2
0 has the same configuration as the above-mentioned radio device 13, which is a conventional device, regarding transmission and reception.

Therefore, the operation is the same, and the transmission signal input from the high frequency input terminal 1 is sent to the selector switch 1.
5. Power is amplified by the power amplification unit 3 through the excitation unit 2, and sent to the antenna input/output terminal 6 through the changeover switch 16 and the duplexer 4.

When a received signal is input to the antenna input/output terminal 6, it is sent to the receiving section 5 through the duplexer 4.

Next, the operation when used as a fixed radio device, that is, a tabletop radio device or a vehicle-mounted radio device will be explained.

First, the output terminal 17 of the portable radio 21 and the input terminal 19 of the booster 22 are connected, and then the input terminal 18 of the portable radio 21 and the output terminal 20 of the booster 22 are connected. In addition, by operating the changeover switches 15 and 16, the signal line 1a and the signal line 1
5b and the signal line 3a are connected to the signal line 16a, respectively.

When a transmission signal is input from the high frequency input terminal 1 in such a state, this transmission signal is transferred to the selector switch 15.
from the input terminal 1 to the output terminal 17, and further to the input terminal 1.
The signal is input to the power amplification section 9 through the power amplifier 9. Here, the power is amplified at a high amplification factor and returns to the portable radio device 21 via the output terminal 20 and the input terminal 18. This signal is further sent to the antenna input/output terminal 6 through the changeover switch 16 and the duplexer 4.

On the other hand, when a received signal is input to the antenna input/output terminal 6, it is transmitted to the receiving section 5 through the duplexer 4, similarly to when the portable radio device 21 is used alone.

In this embodiment, the changeover switch 15 is provided before the excitation section 2, but it may be provided after the excitation section 2 as long as it is before the power amplification section 3.

〔Effect of the invention〕

As explained above, according to the wireless device of the present invention, a changeover switch is provided before and after the power amplification section inside the portable wireless device, so a booster can be connected to the portable wireless device for use on a table or in a car. When used, the transmission signal can be input directly to the power amplification section inside the booster without passing through the power amplification section inside the portable radio device by switching the changeover switch. Therefore, adjustment using an attenuator or the like is not required when connecting the portable radio to the booster.

In addition, since the connection between the portable radio and the booster is made in the transmission system of the portable radio, there is no need to equip the booster with a circulator or duplexer that distributes the signal direction of the transmitted signal and the received signal. equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a block diagram showing a conventional radio device and booster. 3, 9...power amplification section, 4...duplexer, 5...
Receiving section, 6...Antenna input/output terminal, 15, 16
...Selector switch, 17,20...Output terminal, 1
8, 19...Input terminal, 21...Portable radio,
22...Booster.

Claims (1)

[Claims] 1 A power amplifying section for amplifying a transmitted signal, a receiving section for demodulating a received signal, etc., a transmitting signal is sent from the power amplifying section to an antenna input/output terminal, and a received signal is sent from the antenna input/output terminal to the receiving section. A wireless device comprising: a portable radio device capable of transmitting and receiving calls at the same time by being equipped with a duplexer that transmits signals to the portable radio device; and a booster that increases the transmission output of the portable radio device by connecting with the portable radio device. The portable radio device includes an input terminal, an output terminal, a first changeover switch that outputs a transmission signal to either the power amplification section or the output terminal by a switching operation, and a first changeover switch that outputs a transmission signal to either the power amplification section or the output terminal by a switching operation. a second changeover switch that outputs a signal from either one of the input terminals to the duplexer, and the booster has an input terminal connected to the output terminal of the portable radio; A wireless device comprising: an output terminal connected to an input terminal; and a power amplification section that amplifies a signal from the input terminal and outputs the signal to the output terminal.