JP2000022645A - Radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio equipment that stably discriminates a fault in a transmission-reception antenna. SOLUTION: In the case that no transmission-reception antenna 17 is connected to the radio equipment, a transmission signal S12a is reflected in an antenna terminal 16 and becomes a reflection wave swr, which is detected by a detector 19 via an input output terminal 14b and a reception signal output terminal 14c. A detection section 23 converts the detected reflected wave swr into a detection voltage S23, which is A/D-converted by an A/D converter 24 and a detection signal S24 is outputted. A detection section 21 converts a transmission signal S12b into a detection voltage S21, which is A/D-converted by an A/D converter 22 and a detection signal S22 is outputted. A data processing section 26 receives the detection signals S22, S24, the data processing section 26 selects a proper threshold level S25 from a ROM 25 based on a level of the detection signal S22 to discriminate whether or not the detection section S24 is a faulty signal based on the threshold level S25. When the signal is faulty, a fault detection signal S26 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus provided in, for example, a base station of a cellular phone and having a function of outputting an abnormality detection signal when a transmitting / receiving antenna is not connected to a signal transmission line. Things.

[0002]

2. Description of the Related Art FIG. 2 is a schematic block diagram showing an example of a conventional radio device. This wireless device is provided in, for example, a base station of a mobile phone, and inputs and amplifies a transmission wave sw.
It has a power amplifier 1 that generates and outputs a transmission signal S1. The power amplifier 1 has an output impedance of, for example, 50Ω. A transmission signal input terminal 3a of the circulator 3 is connected to an output side of the power amplifier 1 via a transmission line 2 having a characteristic impedance of 50Ω. The transmission signal input terminal 3a has an input impedance of 50Ω. The input / output terminal 3b of the circulator 3
It has an output impedance and an input impedance of Ω, and is connected to an antenna terminal 5 via a transmission line 4 having a characteristic impedance of 50 Ω. 5 for antenna terminal 5
A transmitting / receiving antenna 6 having an output impedance and an input impedance of 0Ω is connected.

The reception signal output terminal 3c of the circulator 3
Has an output impedance of 50Ω and is connected to a detector 8 via a transmission line 7 having a characteristic impedance of 50Ω. The detector 8 is composed of, for example, a directional coupler or the like, and branches the reception signal S3c output from the reception signal output terminal 3c into reception signals S8a and S8b, and outputs the signals from the first and second output terminals. Things. A first output terminal of the detector 8 is connected to a low noise amplifier 9 having an input impedance of 50Ω and amplifying the reception signal S8a and outputting a reception wave rw. A receiving mixer (not shown) is connected to the output side of the low noise amplifier 9.
The reception mixer has a function of mixing the reception wave rw and the reception local oscillation frequency to output a reception intermediate frequency. A detection circuit 10 is connected to a second output terminal of the detector 8. The detection circuit 10 includes, for example, a diode and a capacitor, and outputs a detection voltage S10 corresponding to the level of the reception signal S8b. A comparator (not shown) is connected to the output side of the detection circuit 10. This comparator outputs an abnormality detection signal indicating that the transmitting / receiving antenna 6 is disconnected when the detection voltage S10 is higher than a predetermined threshold Th.

Next, the operation of FIG. 2 will be described. Transmission wave sw
Is input to the power amplifier 1 and amplified to a specified transmission power, and the power amplifier 1 outputs a transmission signal S1. The transmission signal S1 is input to the transmission / reception antenna 6 via the transmission line 2, the circulator 3, the transmission line 4, and the antenna terminal 5 sequentially, and the transmission radio wave Sw is output from the transmission / reception antenna 6 to the air. The received radio wave Rw arriving from the air is input from the transmitting / receiving antenna 6, and is input to the low-noise amplifier 9 via the antenna terminal 5, the transmission line 4, the circulator 3, the transmission line 7, and the detector 8 sequentially. In this case, since the impedance of the transmission system of the transmission signal S1 is in a matching state, the transmission signal S1 is not reflected.

However, when the transmitting / receiving antenna 6 is not connected to the antenna terminal 5 due to detachment or breakage of the antenna terminal 5, the end of the transmission line 4 (that is, the antenna terminal 5) is opened. In this case, the transmission signal S1 is input from the transmission signal input terminal 3a of the circulator 3 and output to the input / output terminal 3b. However, since the impedance is not in the impedance matching state, the transmission signal S1 is reflected by the antenna terminal 5 and the reflected wave sw
r and input to the input / output terminal 3b. I / O terminal 3
b is input to the reception signal output terminal 3c.
And is detected by the detector 8. The detected reflected wave swr is converted into a detection voltage S10 by a detection circuit 10,
The detection voltage S10 is compared with a threshold Th by a comparator. When the detection voltage S10 is larger than the threshold Th,
An abnormality detection signal is output from the comparator. On the other hand, when the transmitting / receiving antenna 6 is normally connected, the reflected wave s
Since no wr is generated, only the received radio wave Rw is detected. Since the level of the received radio wave Rw is extremely lower than that of the reflected wave swr, the detection voltage S10 is much lower than the detection voltage S10 at the time of abnormality. Therefore, if the threshold value Th is set so that the comparator operates at the detection voltage S10 at the time of abnormality, the abnormality of the transmitting / receiving antenna 6 is accurately detected.

[0006]

However, the conventional wireless device of FIG. 2 has the following problems (i) to (iii). (I) When the value of the transmission signal S1 output from the power amplifier 1 fluctuates due to use environment conditions such as the ambient temperature, the value of the reflected wave swr also fluctuates, but the threshold Th of the comparator (not shown) is set to be constant. Therefore, even if an abnormality occurs in the transmitting / receiving antenna 6, the detection voltage S10 may be lower than the threshold Th, and the abnormality may not be detected. (Ii) Detection circuit 1 depending on the operating environment conditions such as ambient temperature
Even if the detection characteristic of 0 fluctuates and an abnormality occurs in the transmitting / receiving antenna 6, the detection voltage S10 may become lower than the threshold Th, and the abnormality may not be detected. (iii) Even if an abnormality occurs in the transmitting / receiving antenna 6 due to a variation in the detection characteristics of the detector 8, the detection voltage S10 may be lower than the threshold Th, and the abnormality may not be detected.

[0007]

According to a first aspect of the present invention, there is provided a wireless device having a predetermined value of output impedance and generating a high-frequency transmission signal in a wireless device. Transmitting means for transmitting and outputting the transmission signal as it is, and detecting the transmission signal and outputting a first detection signal;
A first transmission line having the characteristic impedance of the predetermined value and transmitting the transmission signal output from the first detection means; a transmission signal input terminal having the input impedance of the predetermined value; An input / output terminal having an output impedance and an input impedance of a value and a reception signal output terminal having an output impedance of the predetermined value, wherein the transmission signal transmitted by the first transmission line in a transmission state is transmitted. Transmission / reception switching means for inputting from the transmission signal input terminal, outputting to the input / output terminal, and inputting a reception signal from the input / output terminal to output to the reception signal output terminal in a reception state; A second transmission for transmitting the transmission signal output from the input / output terminal and transmitting the reception signal to the input / output terminal. And the input / output terminal of the transmission / reception switching means via the second transmission line, the input / output terminal having the input impedance and the output impedance of the predetermined values, and the transmission transmitted by the second transmission line. A signal transmitting and receiving antenna for emitting a signal into the air, receiving a radio wave arriving from the air and outputting the received signal, and having the characteristic impedance of the predetermined value, and receiving the signal output from the received signal output terminal. A third transmission line for transmitting a signal, the reception signal output from the transmission / reception antenna or the reception signal transmitted by the third transmission line is passed through and output as it is, and the transmission / reception antenna is When the second transmission line is not connected, a reflected wave of the transmission signal reflected at the open end of the second transmission line is detected to generate a second detection signal. A second detecting means for receiving, the receiving means having an input impedance of the predetermined value, receiving the received signal transmitted by the third transmission line and outputting a received wave; 2
Storage means for storing a plurality of threshold values corresponding to the level of the detected signal, and a threshold value corresponding to the level of the first or second detected signal among the threshold values, and selecting the threshold value of the second detected signal. If the level is greater than the selected threshold, the transmitting and receiving antenna and the second transmission line

[0008] By adopting such a configuration, in the transmission state, the transmission signal output from the transmission means passes through the first detection means and is detected by the first detection means. A detection signal is output. The transmission signal that has passed through the first detection means passes through the first transmission line, the transmission signal input terminal and the input / output terminal of the transmission / reception switching means, and the second transmission line sequentially, and is radiated from the transmission / reception antenna to the air. You. In the receiving state, radio waves arriving from the air are received by the transmitting / receiving antenna, and a received signal is output from the transmitting / receiving antenna. The received signal is sequentially input to the receiving means via the second transmission line, the input / output terminal of the transmission / reception switching means, the received signal output terminal, and the third transmission line, and the received wave is output from the receiving means. You. When the transmitting / receiving antenna is in a disconnected state, the reflected wave of the transmission signal reflected at the open end of the second transmission line is input to the second detection means via the second or third transmission line, A second detection signal is output from the second detection means. In the data processing means, a threshold value corresponding to the level of the first or second detection signal is selected from among the threshold values stored in the storage means, and the level of the second detection signal is set higher than the selected threshold value. Is larger, an abnormality detection signal is output.

In the invention according to claim 2, the transmitting means, the first transmission line, the transmitting / receiving antenna, the second transmission line, the transmission / reception switching means, the third transmission line, the receiving means, Detection means, second detection means and storage means, temperature detection means for detecting an ambient temperature of the first or second detection means and outputting a temperature detection value, and the first or A threshold corresponding to the level of the second detection signal is selected, and a correction value corresponding to the temperature detection value is calculated for the level of the first or second detection signal, and the correction value is selected. A data processing unit that outputs an abnormality detection signal indicating a disconnected state between the transmitting / receiving antenna and the second transmission line when the value is larger than the threshold value. By employing such a configuration, the ambient temperature of the first or second detecting means is detected by the temperature detecting means, and the detected temperature value is output. In the data processing means, a threshold value corresponding to the level of the first or second detection signal is selected from the threshold values stored in the storage means, and the threshold value for the level of the first or second detection signal is selected. A correction value according to the detected temperature value is calculated,
If the correction value is larger than the selected threshold, an abnormality detection signal is output.

In the invention according to claim 3, the transmitting means, the first transmission line, the transmitting / receiving antenna, the second transmission line, the transmission / reception switching means, the third transmission line, the receiving means, Detecting means and second detecting means, a plurality of thresholds corresponding to the level of the first or second detected signal, and a correction value for correcting the level of the first or second detected signal to a standard value Storage means for storing the first
Or selecting a threshold value according to the level of the second detection signal and correcting the level of the first or second detection signal to the standard value, and when the standard value is larger than the selected threshold value,
A data processing unit that outputs an abnormality detection signal indicating a disconnected state between the transmitting / receiving antenna and the second transmission line,
Have. Thereby, in the data processing means, a threshold value corresponding to the level of the first or second detection signal among the threshold values stored in the storage means is selected, and the standard value of the level of the second detection signal is set to the standard value. If it is larger than the selected threshold, an abnormality detection signal is output.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a block diagram of a radio apparatus according to a first embodiment of the present invention. This wireless device is provided, for example, in a base station of a mobile phone or the like, and a transmitting unit (for example, a high frequency transmission wave sw output from a transmission mixer (not shown) that mixes a transmission intermediate frequency and a transmission local oscillation frequency) (for example, (Power amplifier) 11. The power amplifier 11 transmits the transmission wave sw
Is amplified to a specified transmission power to output a transmission signal S11, and has, for example, an output impedance of 50Ω. A detector 12 is connected to the output side of the power amplifier 11. The detector 12 is a circuit that splits the transmission signal S11 into transmission signals S12a and S12b and outputs them from the first and second output terminals, for example, is configured by a directional coupler or the like and is connected to the input side. The impedance matching between the circuit and the circuit connected to the output side is not affected. A first output terminal of the detector 12 has a first transmission line 13 having a characteristic impedance of 50Ω.
Transmission / reception switching means (for example, a circulator) 14
Are connected to the transmission signal input terminal 14a. The transmission signal input terminal 14a has an input impedance of 50Ω. The input / output terminal 14b of the circulator 14
The second transmission line 15 having an output impedance and an input impedance of 0Ω and a characteristic impedance of 50Ω
Is connected to the antenna terminal 16 via the. The transmitting / receiving antenna 17 having an output impedance and an input impedance of 50Ω is connected to the antenna terminal 16.

The received signal output terminal 1 of the circulator 14
4c has an output impedance of 50Ω and is connected to a detector 19 via a third transmission line 18 having a characteristic impedance of 50Ω. The detector 19 is a circuit that branches the reception signal S14c output from the reception signal output terminal 14c into reception signals S19a and S19b and outputs the signals from the first and second output terminals, respectively. A first output terminal of the detector 19 has a 50Ω input impedance, a receiving means (for example, a low noise amplifier) 2 for amplifying the received signal S19a to a specified level with low noise and outputting a received wave rw 2
0 is connected. On the output side of the low noise amplifier 20,
A receiving mixer (not shown) is connected. The reception mixer has a function of mixing the reception wave rw and the reception local oscillation frequency to output a reception intermediate frequency. The detector 21 is connected to a second output terminal of the detector 12. The detection unit 21 is a circuit that includes, for example, a diode and a capacitor, and that outputs an analog detection voltage S21 corresponding to the level of the transmission signal S12b. An analog / digital (hereinafter, “A / D”) converter 22 that converts the detection voltage S21 into a digital signal and outputs a first detection signal S22 is connected to the output side of the detection unit 21. The detector 12, the detector 21, and the A / D converter 22 constitute a first detector.

A second output terminal of the detector 19 has an analog detection voltage S2 corresponding to the level of the reception signal S19b.
3 is connected. Detector 23
A / D converter 24 that converts the detection voltage S23 into a digital signal and outputs a second detection signal S24
Is connected. The detector 19, the detector 23, and the A / D converter 24 constitute a second detector. Further, this radio apparatus includes detection signals S22 and S22.
A storage means (for example, a read-only memory, hereinafter, referred to as “ROM”) 25 for storing a plurality of thresholds S25 corresponding to 24 levels is provided. ROM25
Each output side of the A / D converters 22 and 24 is connected to a data processing unit (for example, a data processing unit) 26.
The data processing unit 26 receives the detection signals S22 and S24 and a plurality of threshold values S25, performs predetermined processing, and outputs an abnormality detection signal S26 when the transmission / reception antenna 17 and the transmission line 15 are not connected. have.

FIG. 3 is a schematic configuration diagram of the circulator 14 in FIG. The circulator 14 has a transmission signal input terminal 14a, an input / output terminal 14b, and a reception signal output terminal 14c, and these terminals 14a, 14b, 1
4c, transmission lines 13, 1 having a characteristic impedance of 50Ω.
5 and 18 are respectively connected. The circulator 14 transmits a transmission signal S12a to a transmission signal input terminal 14a.
From the input / output terminal 14b, and the output signal S17 of the transmitting / receiving antenna 17 from the input / output terminal 14b to the reception signal output terminal 14c. Next, the operation of the wireless device of FIG. 1 will be described.

The transmission wave sw is input to the power amplifier 11 and amplified to a specified transmission power, and the power amplifier 11 outputs a transmission signal S11. The transmission signal S11 is the detector 1
The transmission signal S12a is branched into transmission signals S12a and S12b in step 2, and the transmission signal S12a is input to the transmission / reception antenna 17 via the transmission line 13, the circulator 14, the transmission line 15 and the antenna terminal 16 sequentially, and transmitted from the transmission / reception antenna 17 to the air. The radio wave Sw is output. The received radio wave Rw arriving from the air is input to the transmitting / receiving antenna 17, and the antenna terminal 1
6, transmission line 15, circulator 14, transmission line 18
Then, the signal is sequentially input to the low noise amplifier 20 via the detector 19. In this case, the transmission signals S11 and S12a are in a matching state in the transmission system of the transmission signals S11 and S12a, so that the transmission signals S11 and S12a are not reflected.

However, for example, when the antenna terminal 16 comes off or is damaged, the transmission / reception antenna 17 is not connected to the antenna terminal 16.
Is not connected to the end of the transmission line 15 (ie,
The antenna terminal 16) is opened. In this case, the transmission signal S12a is input from the transmission signal input terminal 14a and output to the input / output terminal 14b. However, since the impedance is not in an impedance matching state, the transmission signal S12a is reflected by the antenna terminal 16 and becomes a reflected wave swr. Input to the input / output terminal 14b.
The reflected wave swr input from the input / output terminal 14b is output from the reception signal output terminal 14c and detected by the detector 19. The detected reflected wave swr is converted to a detection voltage S23 by the detection unit 23. The detection voltage S23 is A / D converted by the A / D converter 24, and the A / D converter 24 outputs a detection signal S24. The detection signal S24 is input to the data processing unit 26.

On the other hand, the transmission signal S12b is converted into a detection voltage S21 by the detection unit 21. The detection voltage S21 is A / D
The A / D converter 22 performs A / D conversion, and the A / D converter 22 outputs a detection signal S22. The detection signal S22 is input to the data processing unit 26. In the data processing unit 26, an appropriate threshold S25 is selected from a plurality of thresholds in the ROM 25 based on the level of the detection signal S22, and it is determined whether the detection signal S24 is abnormal based on the selected threshold S25. Is determined. Then, when the level of the detection signal S24 exceeds the threshold value S25, the data processing unit 26 outputs the abnormality detection signal S26. Antenna for transmission and reception 17
Is normally connected, no reflected wave swr is generated, and only the received signal S14c is detected. Since the level of the reception signal S14c is very low as compared with the reflected wave swr, the detection of the abnormality of the transmitting and receiving antenna 17 is not affected.

As described above, in the first embodiment,
Threshold value S25 selected based on the level of detection signal S22
Is compared with the detection signal S24 to determine whether the transmission / reception antenna 17 is abnormal. Therefore, even if the reflected power value fluctuates due to the fluctuation of the level of the transmission signal S11, the transmission / reception antenna 17 is determined. 17 can be stably determined.

Second Embodiment FIG. 4 is a block diagram of a radio apparatus according to a second embodiment of the present invention. In FIG. 4, the same elements as those in FIG. Reference numerals are given. In this wireless device, the detector 12, the detector 21, and the A / D converter 22 in FIG. 1 are omitted, and instead of the ROM 25 and the data processor 26, a ROM 25A and a data processor 26 having different configurations are used.
A is provided. The ROM 25A stores the detection signal S24
Are stored as the plurality of threshold values S25A corresponding to the levels of. The data processing unit 26A receives the detection signal S24 and the plurality of threshold values S25A and performs predetermined processing. When the transmission / reception antenna 17 is in a non-connection state, the abnormality detection signal S26
A is provided. Other configurations are the same as those in FIG.

The operation of the wireless device of FIG. 4 differs from the wireless device of FIG. 1 in the following points. In the data processing unit 26A, an appropriate threshold S25A is selected from a plurality of thresholds in the ROM 25A based on the level of the detection signal S24 according to the reflected power value detected by the detector 19. It is determined whether or not the detection signal S24 is abnormal based on the selected threshold value S25A. When the level of the detection signal S24 exceeds the threshold value S25A, the data processing unit 26
A outputs an abnormality detection signal S26A. As described above, in the second embodiment, it is determined whether the transmission / reception antenna 17 is abnormal by comparing the detection signal S24 with the threshold value S25A selected based on the level of the detection signal S24. With this configuration, even if the reflected power value fluctuates due to the fluctuation of the level of the transmission signal S11, it is possible to stably determine the abnormality of the transmitting / receiving antenna 17 with a simpler configuration than in the first embodiment. .

Third Embodiment FIG. 5 is a block diagram of a radio apparatus according to a third embodiment of the present invention. The elements common to the elements in FIG. 4 showing the second embodiment are the same as those in FIG. Reference numerals are given. In this wireless device, the transmission amplifier 27 is connected to the input side of the power amplifier 11 in FIG.
The second output terminal of the detector 12 is connected to the gain adjustment signal input terminal of the transmission amplifier 27. The transmission amplifier 27 amplifies the transmission wave sw with a gain adjusted based on the transmission signal S12b so that the transmission signal S11 has a constant value. In this wireless device,
4. Instead of the ROM 25A and the data processing unit 26A in FIG.
Is provided in the data processing unit 26B.
Is connected. The detection signal S24 is stored in the ROM 25B.
And a correction value S25Bb for correcting to the standard value tp when the level of the detection signal S24 varies. The temperature sensor 28 detects the ambient temperature of the wave detector 19 and the wave detector 23 and outputs a temperature detection value S28.

The data processing section 26B includes a detection signal S24,
Input a plurality of threshold values S25Ba and correction values S25Bb,
A correction value corresponding to the temperature detection value S28 is calculated for the level of the detection signal S24, the correction value is corrected to the standard value tp, and a predetermined process is performed. If the transmission / reception antenna 17 is not connected, an abnormal It has a function of outputting the detection signal S26A. Other configurations are the same as those in FIG. The operation of the wireless device of FIG. 5 differs from the wireless device of FIG. 4 in the following points. The gain of the transmission amplifier 27 is controlled based on the transmission signal S12b, and the transmission signal S11 is maintained at a constant value.
In the data processing unit 26B, a correction value corresponding to the temperature detection value S28 is calculated for the level of the detection signal S24,
This correction value is corrected to the standard value tp. When the standard value tp exceeds the threshold value S25A, the data processing unit 26B outputs an abnormality detection signal S26B.

As described above, in the third embodiment,
The level of the detection signal S24 is corrected according to the temperature detection value S28, and the correction value is corrected to the standard value tp. Therefore, when the detection characteristic changes due to a change in the ambient temperature or a variation in the level of the detection signal S24. However, the abnormality of the transmitting / receiving antenna 17 can be stably determined. Further, since the transmission signal S11 is maintained at a constant value, there is no change in the reflected power value, and the abnormality of the transmitting / receiving antenna 17 can be determined more stably.

Fourth Embodiment FIG. 6 is a block diagram of a wireless device showing a fourth embodiment of the present invention. FIG. 6 shows the first embodiment and FIG. 5 shows the third embodiment. Elements common to those in the middle are denoted by common reference numerals. In this wireless device, the ROM 25 in FIG.
And a ROM 2 having a different configuration in place of the data processing unit 26
5C and a data processing unit 26C are provided, and a temperature sensor 28 is connected to the data processing unit 26C. ROM
25C, a plurality of thresholds S25Ca corresponding to the levels of the detection signals S22 and S24, and the detection signals S22 and S24.
A correction value S25Cb for correcting to the standard value tp when there is a variation in the level of. The data processing unit 26C detects the detected signals S22 and S24 and the plurality of thresholds S
25Ca and the correction value S25Cb, and the detection signal S2
2. A correction value corresponding to the temperature detection value S28 is calculated for the level of S24, the correction value is corrected to the standard value tp, and a predetermined process is performed. It has a function of outputting the detection signal S26C. Other configurations are the same as those in FIGS. 1 and 5.

The operation of the radio apparatus of FIG. 6 differs from the radio apparatuses of FIGS. 1 and 5 in the following points. In the data processing unit 26C, a correction value corresponding to the detected temperature value S28 is calculated for the levels of the detection signals S22 and S24, and the correction value is corrected to the standard value tp. The standard value tp is equal to the threshold S
If it exceeds 25Ca, the data processing unit 26C outputs an abnormality detection signal S26C. As described above, this fourth
In the embodiment, the levels of the detection signals S22 and S24 are corrected according to the temperature detection value S28, and the correction value is set to a standard value t.
Since the correction is made to p, in addition to the advantages of the first embodiment, even when the detection characteristic changes due to a change in the ambient temperature or a variation in the level of the detection signals S22 and S24, the same as in the third embodiment. Thus, the abnormality of the transmitting / receiving antenna 17 can be stably determined.

Fifth Embodiment FIG. 7 is a block diagram of a radio apparatus according to a fifth embodiment of the present invention. In FIG. 7, the same elements as those in FIG. Reference numerals are given. In this wireless device, a ROM 25B data processing unit 26B in FIG. 5 is provided instead of the ROM 25A and the data processing unit 26A in FIG. 4, and a temperature sensor 28 is connected to the data processing unit 26B. Other configurations are the same as those in FIG. This FIG.
In the operation of the wireless device, the following points are different from the wireless device of FIG. In the data processing unit 26B, as in FIG. 5, the temperature detection value S28 is changed with respect to the level of the detection signal S24.
Is calculated, and this correction value is corrected to the standard value tp. When the standard value tp exceeds the threshold value S25A,
An abnormality detection signal S26B is output from the data processing unit 26B.

As described above, in the fifth embodiment,
The level of the detection signal S24 is corrected according to the temperature detection value S28, and the correction value is corrected to the standard value tp. Therefore, in addition to the advantages of the second embodiment, changes in the ambient temperature and the detection signal S24 can be obtained. Even when the detection characteristic changes due to the level variation, it is possible to stably determine the abnormality of the transmitting / receiving antenna 17.

Sixth Embodiment FIG. 8 is a block diagram of a radio apparatus according to a sixth embodiment of the present invention. The elements common to the elements in FIG. 1 according to the first embodiment are the same as those in FIG. Reference numerals are given. In this wireless device, a switch (SW) 29 for switching to a transmission state or a reception state is provided instead of the circulator 14 in FIG. The switch 29 is composed of, for example, a high-frequency switch. The transmission signal S12a is input from the input terminal 29a and output to the input / output terminal 29b in the transmission state, and receives the reception radio wave Rw or the reflected wave swr in the reception state. The signal is input from the output terminal 29b and output to the output terminal 29c. The detector 19 includes an input / output terminal 29b and an antenna terminal 16
Is connected between. Other configurations are the same as those in FIG.

In the radio apparatus of FIG. 8, the state is switched to the transmission state or the reception state by the switch 29, and substantially the same operation as that of the radio apparatus of FIG. 1 is performed. As described above, in the sixth embodiment, the detector 19 is provided between the input / output terminal 29b and the antenna terminal 16, so that in addition to the advantages of the first embodiment, transmission and reception can be performed without using a circulator. It is possible to stably determine the abnormality of the service antenna 17.

Seventh Embodiment FIG. 9 is a block diagram of a radio apparatus according to a seventh embodiment of the present invention. The elements common to the elements in FIG. 4 showing the second embodiment are the same as those in FIG. Reference numerals are given. In this wireless device, similarly to the wireless device in FIG. 8, a switch 29 for switching to a transmission state or a reception state is provided instead of the circulator 14 in FIG. Other configurations are the same as those in FIG. In the wireless device of FIG. 9, the state is switched to the transmission state or the reception state by the switch 29, and substantially the same operation as that of the wireless device of FIG. 4 is performed. As described above, in the seventh embodiment, the detector 19 is provided between the input / output terminal 29b and the antenna terminal 16, so that in addition to the advantages of the second embodiment, transmission / reception is performed without using a circulator. It is possible to stably determine the abnormality of the service antenna 17.

Eighth Embodiment FIG. 10 is a diagram showing the configuration of a radio apparatus according to an eighth embodiment of the present invention. In FIG. 10, the same elements as those in FIG. 5 showing the third embodiment are denoted by the same reference numerals. Is attached. In this wireless device, similarly to the wireless device in FIG. 8, a switch 29 for switching to a transmission state or a reception state is provided instead of the circulator 14 in FIG. Other configurations are the same as those in FIG. In the wireless device of FIG. 10, the state is switched to the transmission state or the reception state by the switch 29, and substantially the same operation as that of the wireless device of FIG. 5 is performed. As described above, in the eighth embodiment, the detector 19 is provided between the input / output terminal 29b and the antenna terminal 16, so that in addition to the advantages of the third embodiment, transmission / reception is performed without using a circulator. Antenna 17
Can be stably determined.

Ninth Embodiment FIG. 11 is a diagram showing the configuration of a radio apparatus according to a ninth embodiment of the present invention. Elements common to those in FIG. 6 showing the fourth embodiment are the same as those shown in FIG. Reference numerals are given. In this wireless device, similarly to the wireless device of FIG. 8, a switch 29 for switching to a transmission state or a reception state is provided instead of the circulator 14 in FIG. Other configurations are the same as those in FIG. In the wireless device of FIG. 11, the state is switched to the transmission state or the reception state by the switch 29, and substantially the same operation as that of the wireless device of FIG. 6 is performed. As described above, in the ninth embodiment, the detector 19 is provided between the input / output terminal 29b and the antenna terminal 16, so that in addition to the advantages of the fourth embodiment, transmission / reception is performed without using a circulator. Antenna 17
Can be stably determined.

Tenth Embodiment FIG. 12 is a block diagram of a radio apparatus according to a tenth embodiment of the present invention. Elements common to the elements in FIG. 7 showing the fifth embodiment are the same as those shown in FIG. Reference numerals are given. In this wireless device, similarly to the wireless device in FIG. 8, a switch 29 for switching to a transmission state or a reception state is provided instead of the circulator 14 in FIG. Other configurations are the same as those in FIG. In the wireless device of FIG. 12, the state is switched to the transmission state or the reception state by the switch 29, and substantially the same operation as that of the wireless device of FIG. 7 is performed. As described above, this first
In the zeroth embodiment, the detector 19 is provided between the input / output terminal 29b and the antenna terminal 16, so that in addition to the advantages of the fifth embodiment, the abnormality of the transmitting / receiving antenna 17 can be determined without using a circulator. Can be performed stably.

The present invention is not limited to the above embodiment,
Various modifications are possible. For example, there are the following modifications. (A) The present invention is not limited to a wireless device provided in a base station of a mobile phone, but can be applied to all wireless devices having a transmitting / receiving antenna. (B) In the third, fourth, fifth, eighth, ninth, and tenth embodiments, the process of correcting the levels of the detection signals S22 and S24 to the standard value tp is performed by changing the levels of the detection signals S22 and S24. If there is no variation, it may be omitted. (C) The circulator of FIG. 3 may be configured by combining, for example, a band-pass filter that allows only a signal in a specific frequency band to pass. (D) In the sixth to tenth embodiments, the detector 19
However, it is preferable that the detector 19 can output only the reflected wave to the detector 23. For example, a directional coupler that can sufficiently separate the transmitted wave and the reflected wave can be used.

[0035]

As described above in detail, according to the first aspect of the present invention, the threshold value selected based on the level of the first detection signal is compared with the second detection signal to transmit and receive the signal. Since it is determined whether or not the antenna is abnormal, even if the reflected power value fluctuates due to the fluctuation of the level of the transmission signal, the abnormality of the transmitting / receiving antenna can be stably determined.

According to the second aspect of the present invention, the level of the first or second detection signal is corrected in accordance with the detected temperature value, and whether or not the transmitting / receiving antenna is abnormal is determined using the corrected value. Since the determination is made, even if the detection characteristic changes due to a change in the ambient temperature, it is possible to stably determine the abnormality of the transmitting / receiving antenna. According to the third aspect of the invention, the level of the first or second detection signal is corrected according to the detected temperature value, and the correction value is corrected to a standard value. In addition to the effects, even when the detection characteristics change due to a change in the ambient temperature or a variation in the level of each detection signal, it is possible to stably determine the abnormality of the transmitting / receiving antenna.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional wireless device.

FIG. 3 is a configuration diagram of a circulator 14 in FIG.

FIG. 4 is a configuration diagram of a wireless device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a wireless device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a wireless device according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a wireless device according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a wireless device according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a wireless device according to a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of a wireless device according to an eighth embodiment of the present invention.

FIG. 11 is a configuration diagram of a wireless device according to a ninth embodiment of the present invention.

FIG. 12 is a configuration diagram of a wireless device according to a tenth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Power amplifier 12, 19 Detector 13 Transmission line 14 Circulator 15, 18 Transmission line 17 Transmission / reception antenna 20 Low noise amplifier 21, 23 Detection part 22, 24 A / D converter 25, 25A, 25B, 25C ROM 26, 26A , 26B, 26C Data processing unit 27 Transmission amplifier 28 Temperature sensor 29 Switch (SW)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K021 BB00 EE01 GG01 5K042 AA06 BA11 CA02 CA13 CA16 CA17 DA26 DA32 EA03 FA15 FA21 FA23 FA24 GA02 GA06 GA11 5K067 AA33 EE10 EE32 KK01 LL14

Claims (3)

[Claims] An output impedance having a predetermined value;
Transmission means for generating and outputting a high-frequency transmission signal; first detection means for passing the transmission signal and outputting it as it is, and detecting the transmission signal to output a first detection signal; A transmission line for transmitting the transmission signal output from the first detection means, the transmission signal input terminal having an input impedance of the predetermined value, and the predetermined value An input / output terminal having an output impedance and an input impedance, and a reception signal output terminal having an output impedance of the predetermined value, and transmitting the transmission signal transmitted by the first transmission line in a transmission state. A signal input from the signal input terminal and output to the input / output terminal, and a reception signal input from the input / output terminal and output to the reception signal output terminal in the reception state. Switching means, a second transmission line having the characteristic impedance of the predetermined value, transmitting the transmission signal output from the input / output terminal, and transmitting the reception signal to the input / output terminal; The transmission signal is connected to an input / output terminal of the transmission / reception switching means via a second transmission line, has an input impedance and an output impedance of the predetermined values, and places the transmission signal transmitted by the second transmission line in the air. A transmitting / receiving antenna that radiates, receives radio waves arriving from the air, and outputs the reception signal, and has a characteristic impedance of the predetermined value, and transmits the reception signal output from the reception signal output terminal. Third
And the reception signal output from the transmission / reception antenna or the reception signal transmitted by the third transmission line is passed and output as it is, and the transmission / reception antenna and the second transmission line A second detection means for detecting a reflected wave of the transmission signal reflected at the open end of the second transmission line and outputting a second detection signal when the second and third transmission lines are not connected to each other; Receiving means for receiving the reception signal transmitted by the third transmission line and outputting a reception wave; and a plurality of thresholds corresponding to the level of the first or second detection signal Storage means for storing a threshold value according to the level of the first or second detection signal among the threshold values, and when the level of the second detection signal is larger than the selected threshold value, The transmitting and receiving air A wireless device comprising: data processing means for outputting an abnormality detection signal indicating a disconnected state between a line and the second transmission line. 2. The transmission means according to claim 1, a first transmission line, a transmitting / receiving antenna, a second transmission line, a transmission / reception switching means,
A third transmission line, a reception unit, a first detection unit, a second detection unit, and a storage unit; and a temperature detection unit that detects an ambient temperature of the first or second detection unit and outputs a detected temperature value. And selecting a threshold corresponding to the level of the first or second detection signal among the thresholds, and correcting the level of the first or second detection signal according to the temperature detection value. Data processing means for calculating a value, and when the correction value is larger than the selected threshold value, outputting an abnormality detection signal indicating a disconnected state between the transmitting / receiving antenna and the second transmission line. A wireless device, comprising: 3. The transmission means according to claim 1, a first transmission line, a transmitting / receiving antenna, a second transmission line, a transmission / reception switching means,
A third transmission line, a reception unit, a first detection unit and a second detection unit, a plurality of thresholds corresponding to the level of the first or second detection signal, and the first or second detection signal Storage means for storing a correction value for correcting the level of the first or second detection signal to a standard value, and selecting a threshold value corresponding to the level of the first or second detection signal from among the threshold values, and selecting the first or second threshold value. Is corrected to the standard value, and when the standard value is larger than the selected threshold value, an abnormality detection signal indicating a disconnected state between the transmitting / receiving antenna and the second transmission line is output. A wireless device comprising data processing means.