JP3344543B2 - High sensitivity wireless receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-sensitivity radio receiver which is applied to, for example, a base station receiver for mobile communication or satellite communication, and which cools a high-frequency receiver and receives a desired signal.

[0002]

2. Description of the Related Art FIG. 10 shows a basic configuration of a conventional high-sensitivity radio receiver. The conventional high-sensitivity radio receiver includes an antenna 1, an antenna feeder 2 for transmitting a signal received by the antenna 1, a reception band filter (RBF) 3 for selecting a signal of a desired band, and It comprises a receiving low-noise amplifier (also referred to as RA) 4 for amplifying the output of the RBF 3 to a desired level with low noise, and an output terminal 5 for outputting the received signal amplified by RA4. Also, RB
F3 and RA4 are sealed in a heat shielding box 6, insulated from the outside, and cooled by cooling means 7. Further, a first power supply terminal 8 for supplying power to the RA 4 and a second power supply terminal 9 for supplying power to the cooling means 7 are provided. Although not shown here, RBF
In some cases, an isolator is provided between 3 and RA4 in order to achieve matching.

The RBF 3 and the RA 4 are sealed in a heat shield box 6 such as a Dewar bottle, and are stably cooled by a cooling means 7 to an extremely low temperature of, for example, about several tens K for a long time. Here, the cooling means 7 is constituted by a cryogenic refrigerator capable of stably maintaining an extremely low temperature of several tens of K for a long time by utilizing a heat exchange cycle by compression / expansion of helium gas, and these are commercially available. Products can be used.

As described above, by stably and extremely cooling the RBF 3 and RA4 for a long time, the thermal noise generated by them is extremely reduced, and even if the number of stages constituting the RBF 3 is increased, the temperature is low. Since the loss of the RBF 3 is small, the attenuation characteristic of the RBF 3 can be made steep. As a result, by using the high-sensitivity wireless receiver shown in FIG. 9, it is possible to obtain a reception output having, for example, a specified C / N ratio (carrier power / noise power) even for a low-level reception signal. it can. Also, the power on the transmitting side required to obtain the specified C / N ratio reception output can be reduced.
The high-sensitivity wireless receiver is often installed outdoors or near the top of the antenna tower in order to reduce the loss due to the antenna feeder 2.

[0005]

Problems to be Solved by the Invention A conventional high-sensitivity wireless receiver is configured to handle only a received signal. Therefore, when a conventional high-sensitivity wireless receiver is applied to a base station for a mobile communication system such as a mobile phone or a mobile phone, an antenna and an antenna feeder for handling a transmission signal must be separately installed, and the size of the base station equipment is reduced. Since the size of the base station increases, not only the base station cannot be easily installed, but also the base station equipment cannot be reduced in size and economy.

When a high-sensitivity receiver is installed outdoors, consideration must be given to avoiding an obstacle caused by lightning discharge. The failure based on this lightning discharge is caused by the lightning discharge path and the communication line being electrically and magnetically coupled to each other and abnormally high energy called lightning surge invading the communication line. Therefore, when installing a high-sensitivity wireless receiver outdoors,
Lightning surge invades from antennas and antenna feeders,
Since the high-sensitivity wireless receiver may be burned out, or a failure such as an impact may occur, it is necessary to protect the high-sensitivity wireless receiver from this lightning surge, but in the conventional high-sensitivity wireless receiver, There is a problem that the high-sensitivity receiver cannot be protected from these lightning surges.

When a high-sensitivity receiver is installed outdoors, there is a method for detecting an abnormal operation of the RA 4 by observing the level of a received signal and detecting an abnormal operation when the level of the received signal decreases. As described above, the abnormality detection function that depends on the level of the received signal can detect an abnormal operation of the RA4 due to a decrease in the level of the received signal because the level of the received signal is constant, for example, in a fixed line where the transmission / reception equipment does not move. However, in a base station apparatus for a mobile communication system such as a cellular phone or a mobile phone, the reception signal level greatly changes because a communication partner is constantly moving, so that an abnormal operation of RA4 is detected by a decrease in the level of the reception signal. There was a problem that I could not do it.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of antennas by sharing one transmitting antenna and one receiving antenna with one antenna, thereby making it possible to reduce the size and cost of base station equipment, and to install a high-sensitivity wireless receiver outdoors. Can protect high-sensitivity wireless receivers from lightning surges, and immediately and reliably detect failures when RA4 failures or transmission line abnormalities occur. It is an object of the present invention to provide a high-sensitivity wireless receiver capable of performing the above.

[0009]

Means for Solving the Problems (1) The invention of claim 1 provides an antenna, an antenna feeder, a first reception band filter to which a signal from the antenna feeder is input, and a first reception band filter. It has a receiving low-noise amplifier connected later, and an output terminal for outputting an output signal of the receiving low-noise amplifier. The first receiving bandpass filter and the receiving low-noise amplifier are sealed in a heat shield box and cooled by cooling means. The present invention relates to a high-sensitivity wireless receiver that is cooled, is supplied with operating power to the receiving low-noise amplifier through a first power supply terminal, and is supplied with operating power through the second power supply terminal to the cooling unit.

According to the first aspect of the present invention, on the input side of the first reception bandpass filter, a second reception bandpass filter provided outside the heat shield box, a transmission bandpass filter, and the transmission bandpass filter and the second reception bandpass filter. And a coupling circuit for coupling each end to the antenna. A first lightning surge protection means inserted on the antenna side of the coupling circuit; a second lightning surge protection means provided outside the heat shield box on the output side of the receiving low-noise amplifier; Third lightning surge protection means provided outside the heat shield box between the receiving low noise amplifier and fourth lightning surge protection means provided outside the heat shield box between the second power supply terminal and the cooling means. Surge protection means and fifth lightning surge protection means inserted in a path between the transmission signal input terminal and the transmission bandpass filter are provided.

The first receiving bandpass filter is made of a superconducting material, and is brought into a superconducting state by a cooling means. (2) In the invention of claim 2, in the above (1), a common power supply terminal and a common lightning surge protection means are provided instead of the first and second power supply terminals and the third and fourth lightning surge protection means, The output power of the common lightning surge protection means is divided into two by the power distribution means and supplied to the receiving low noise amplifier and the cooling means.

(3) According to the third aspect of the present invention, the first power supply terminal and the third lightning surge protection means of the above (1) are deleted, and the outside of the heat shield box is provided between the reception low noise amplifier and the output terminal. And a power separation filter inserted in series with the second lightning surge protection means to separate operating power supplied via an output terminal from a high-frequency reception signal, and to stabilize power separated by the power separation filter. Power stabilization means for supplying power to the reception low noise amplifier is provided.

(4) In the invention of claim 4, in the above (3), the second power supply terminal and the fourth lightning surge protection means are deleted, and the operating power is supplied also from the power stabilizing means to the cooling means. (5) In the invention of claim 5, in any one of the above (1) to (4), a pilot signal generating means for generating a pilot signal having a frequency within the attenuation band of the first reception bandpass filter, Pilot signal injecting means inserted into a signal path between the bandpass filter and the receiving low noise amplifier; demultiplexing means for demultiplexing the received signal and pilot signal output from the output terminal; A level detecting means for detecting a level, a pilot signal level detected by the level detecting means is compared with a preset threshold value, and an alarm signal is transmitted when the pilot signal level is lower than the threshold value. Monitoring means is provided.

(6) In the invention of claim 6, in the above (5), a temperature detecting means for detecting a temperature inside the heat shielding box,
Pilot signal modulation means for supplying a pilot signal output from the pilot signal generation means to the pilot signal injection means by modulating the pilot signal according to the output signal of the temperature detection means;
Temperature monitoring means for demodulating the pilot signal split by the splitting means to obtain temperature information in the heat shielding box, and sending a temperature alarm signal when the temperature information is equal to or higher than a predetermined temperature. .

(7) In the invention of claim 7, in the above (6), the temperature detecting means detects the temperature of the first receiving bandpass filter in the heat shielding box, the receiving low noise amplifier or the cooling member of the cooling means. (8) In the invention of claim 8, in any one of the above (1) to (7), one or both of the first lightning surge protection means and the fifth lightning surge protection means are omitted.

(9) In the ninth aspect of the present invention, in any one of the above (1) to (7), the superconducting material comprises a high-temperature superconductor. (10) According to the tenth aspect, the above (1) to (7)
In any one of the above, the antenna feeder is omitted,
An antenna is directly connected to the device housing.

[0017]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIG. 10 are given the same reference numerals. In this embodiment, a transmission band-pass filter (also called SBF) 21 is placed between the antenna feeder 2 and the heat shielding box 6.
A transmission / reception sharing unit 23 is provided, which comprises: a second reception bandpass filter (RBF) 22; and a coupling circuit 20 for coupling one end of each of these to the antenna side. Also, SBF2
1 is provided with an input terminal 24 for inputting a transmission signal. First between the antenna feeder 2 and the transmission / reception sharing means 23
Lightning surge protection means (also called PRT) 11
A second PRT 12 outside the heat shield box 6 between the
Is a fourth PR between the second power supply terminal 9 and the cooling means 7.
T14 is the fifth PR between the SBF 21 and the input terminal 24.
T15 connects a third P between the first power supply terminal 8 and RA4.
RTs 13 are provided respectively. The heat shield box 6, the cooling means 7, the PRTs 11, 12, 13, 14, 15 and the transmission / reception sharing means 23 are housed in one housing 16.

The RBF 3 is made of a superconducting material and differs from FIG. 10 in that the superconducting material is brought into a superconducting state by cooling. Here, the transmission / reception sharing unit 23 is also called an antenna sharing unit, and is a unit for sharing transmission and reception with one antenna. The SBF 21 generates noise in the transmission signal from the transmitter input from the input terminal 24 on the reception path,
That is, it is used to prevent the signal from flowing into the path of the RBF 22, the RBF 3, the RA 4, the PRT 12, and the output terminal 5, and has a large attenuation in a reception band. Also RB
F22 attenuates the transmission signal sufficiently so that the RA4 is not desensitized by the transmission signal, and has a large attenuation in the transmission band. SBF21 and RBF
22 is configured using, for example, a coaxial filter, a dielectric filter, etc., and both are designed so that the attenuation can be 80 dB or more.

Each of the PRTs 11 to 15 is composed of a security element called a lightning arrester that protects tracks, equipment and buildings from electrical harm. And a function to quickly return to the current state. As the lightning arrester, there are a carbon lightning arrester, a vacuum lightning arrester, a paper lightning arrester, a gapless lightning arrester, and the like, and all of them are applicable.
Note that neither the PRTs 11 to 15 nor the transmission / reception sharing means 23 is provided inside the heat shield box 6 in order to reduce the load on the cooling means 7.

As shown in FIG. 1, by providing the transmission / reception sharing means 23, both transmission and reception of one antenna can be performed, and downsizing and economical base station equipment can be achieved. Further, by providing the lightning surge protection means on the communication line and the power supply line, the high-sensitivity wireless receiver can be protected from the lightning surge. Further, the RBF 3 is constituted by, for example, a microstrip line, and the ground layer and the signal line constituting the microstrip line are both constituted by a superconducting material, and these are in a superconducting state. The thermal noise generated is significantly lower, and the noise figure of the receiver is improved.

As shown in FIG. 2, a common power supply terminal 8 'and PRT 13'
The operating power may be supplied to each of the cooling means 7 and the cooling means 7 (claim 2).
T can be saved. Here, the power distribution means 25
Is a means for distributing the operating power required for the RA 4 and the cooling means 7.

As shown in FIG. 3, the antenna 1 may be directly connected to the housing 16 without passing through the antenna feeder 2 (claim 10). By removing the antenna feeder 2 in this manner, the loss of the antenna feeder 2 can be reduced, and as a result, the noise figure of the entire receiver can be improved, so that the reception sensitivity is further improved. Note that FIG. 3 is based on the embodiment of FIG. 1, but of course may be based on the embodiment of FIG.

FIG. 4 shows an embodiment of a high-sensitivity radio receiver according to the third aspect of the present invention. According to the present invention, as compared with the embodiment of FIG. 1, a power separation filter 31 is provided outside the heat shielding box 6 between RA4 and PRT12 instead of the power supply terminal 8 and PRT13. 31
The point is that the power stabilizing means 32 for stabilizing the output power of the heat shield box 6 is provided outside the heat shielding box 6. Neither the power separating filter 31 nor the power stabilizing means 32 is provided inside the heat shielding box 6 in order to reduce the load on the cooling means 7.

As a method of supplying power to the RA4, a method of superimposing a DC or low-frequency current on a received signal and transmitting the signal indoors, that is, a phantom power supply method can also be used.
This embodiment is a case in which phantom power is supplied as a power supply method to RA4, and since a reception signal demodulation means or the like in the room is provided through a transmission line (not shown) connected to output terminal 5, A DC current or a low-frequency current passes through the transmission line and passes through the output terminal 5 to the power separation filter 3.
1. The power separation filter 31 is composed of a simple duplexer that separates a received signal from a DC or low-frequency current. The power stabilizing means 32 is means for stabilizing the DC or low-frequency current separated by the power separating filter 31 and stably outputting a DC of a predetermined voltage, and includes a DC-DC converter, a switching power supply, and the like. It is possible. By doing so, there is an advantage that a high-sensitivity wireless receiver can be configured while reducing the number of indoor power cables.

In FIG. 4, the power separating filter 31 is provided between the RA 4 and the PRT 12, but the power separating filter 31 does not include any active element and has a simple structure. PR
It may be provided between T12 and the output terminal 5. Of course, the example of FIG. 4 is more preferable. Note that the present embodiment may be applied to a configuration in which the antenna feeder 2 is removed as shown in FIG. 3 and the antenna 1 is directly connected to the housing 16.

FIG. 5 shows an embodiment of a high-sensitivity receiver according to the present invention. This embodiment is different from the embodiment of FIG. 4 in that the operating power of the cooling unit 7 is supplied by the power stabilizing unit 32 instead of the power supply terminal 9 and the PRT 14. With such a configuration, the number of power supply terminals and power supply lines can be reduced. Note that the present embodiment may be applied to a configuration in which the antenna feeder 2 is removed as shown in FIG. 3 and the antenna 1 is directly connected to the housing 16.

FIG. 6 shows an embodiment of a high-sensitivity radio receiver according to the fifth aspect of the present invention. This embodiment is different from the embodiment of FIG. 1 in that a pilot signal generating means 41 connected to the output side of the PRT 13 and for generating a pilot signal within the attenuation band of the RBF 3 is provided outside the heat shielding box 6. And a pilot signal injecting means 42 for injecting a pilot signal generated by the pilot signal generating means 41 between the RBF 3 and the RA 4. Further, a pilot signal injecting means 42 is provided on the transmission line 26 for transmitting the received signal from the output terminal 5. A demultiplexing means 43 for demultiplexing the pilot signal; a level detecting means 44 for detecting the level of the demultiplexed pilot signal; a level of the pilot signal detected by the level detecting means 44 and a predetermined threshold value; And a monitoring means 45 for transmitting an alarm signal when the level of the pilot signal is lower than the threshold value. Different.

The pilot signal generating means 41 is used to
The reason why the cooling means 7 is not provided inside is to reduce the load on the cooling means 7. As the level detecting means 44, a selection level meter or the like can be used. Further, the monitoring means 45 is composed of a reference voltage generating means for generating a preset threshold voltage and a comparator or the like, or an A / D converter, a microprocessor, an RO as a basic circuit.
M, RAM, etc.
While monitoring the level of the pilot signal, it is determined whether or not the threshold value exceeds a predetermined threshold value. If the pilot signal level is lower than the threshold value, an alarm signal is transmitted.

The pilot signal generated by the pilot signal generation means 41 is injected by the pilot signal injection means 42. At this time, the frequency of the pilot signal is RBF
3 is set so as to be an attenuation band of 3, the injected pilot signal is reflected by the RBF 3 and input to the RA4, so that the pilot signal is not radiated from the antenna 1 and interferes with other systems. Don't worry about giving. The received signal to which the pilot signal has been added is amplified by RA 4 and output from output terminal 5. Therefore, for example, the received signal and the pilot signal are
3, the level of the pilot signal is detected by the level detecting means 44, and if the level of the detected pilot signal is monitored by the monitoring means 45 to determine whether the detected level is lower than a predetermined value, it is possible to go outdoors. It is possible to immediately and reliably detect whether or not a failure has occurred in RA4 in the installed high-sensitivity radio receiver.

In FIG. 6, the pilot signal generating means 41 and the pilot signal injecting means 4 in the configuration example of FIG.
2 is provided, the pilot signal generating means 41 and the pilot signal injecting means 42 can be provided in the configuration examples shown in FIGS. FIG. 6 shows an example in which the pilot signal injection means 42 is not cooled by the cooling means 7, but the pilot signal injection means 42 may be cooled by the cooling means 7. Of course, this also applies to the case where the pilot signal generating means 41 and the pilot signal injecting means 42 are provided in the configuration examples shown in FIGS.

FIG. 7 shows an embodiment of a high-sensitivity radio receiver according to the present invention. This embodiment is different from the embodiment shown in FIG. 6 in that a temperature detecting means 51 for measuring the temperature inside the heat shielding box 6 is provided inside the heat shielding box 6 and output from the pilot signal generating means 41. Modulating means 5 for modulating the pilot signal to be output by the output signal of temperature detecting means 51
2 is provided outside the heat shielding box 6,
Is provided with a demodulation means 53 for demodulating the modulated pilot signal on the output side of the control circuit. The modulating means 52, when the temperature inside the heat shielding box 6 detected by the temperature detecting means 51 becomes higher than a predetermined threshold value,
It has a function of modulating a pilot signal, and various types of modulation such as phase modulation and frequency modulation can be applied. The demodulation unit 53 demodulates the signal modulated by the modulation unit 52 and sends out a temperature alarm when there is a modulation signal. By monitoring the pilot signal level, the RA
The determination of whether or not a failure has occurred in step 4 is the same as in the case of claim 4, so that the operation of modulating the pilot signal will be described below.

When the temperature inside the heat shielding box 6 rises above the threshold value, the modulating means 52 frequency-modulates the pilot signal with a tone signal of, for example, 1 KHz. The pilot signal thus frequency-modulated is demodulated by the demodulation means 53, and a 1 KHz tone signal is detected. The presence of such a modulation signal corresponds to an increase in the temperature in the heat shielding box 6, and the demodulation means 53 sends out a temperature alarm. If there is no modulated signal, no demodulation is performed by the demodulation means 53, and no temperature alarm is sent. That is, the demodulation means 53 is a temperature alarm means for obtaining temperature information in the heat shielding box 6 and issuing a temperature alarm when the temperature information exceeds a predetermined value. As described above, it is possible to monitor two abnormalities of the temperature inside the heat shielding box 6 and the abnormal operation of the RA 4 with one pilot signal.

The modulating means 52 modulates the pilot signal in accordance with the output signal of the temperature detecting means 51, and may send out a temperature warning when the temperature information demodulated by the demodulating means 53, that is, the temperature warning means, exceeds a predetermined temperature. . Although FIG. 7 is based on the configuration example of FIG. 1, the same effect can be obtained based on the configuration examples shown in FIGS. 2 to 5, which is exactly the same as the invention of claim 5. Here, although FIG. 7 shows an example in which the pilot signal injection means 42 is not cooled by the cooling means 7, the pilot signal injection means 42
May be cooled by the cooling means 7. Of course, this means that the pilot signal generating means 41 and the pilot signal injecting means 4 in the configuration examples shown in FIGS.
The same applies to the case where 2 is provided.

FIG. 8 shows an embodiment of the high sensitivity radio receiver according to the present invention. In this embodiment, as compared with the embodiment of FIG. 7, FIG. 8A shows RBF3, FIG. 8B shows RA4,
FIG. 8C is different in that the temperature of the cooling member 7a is directly detected. With such a configuration, a temperature failure occurring in the RBF 3, RA 4, or the cooling member 7a to be cooled can be more accurately detected.

FIG. 9 shows an embodiment of a high-sensitivity radio receiver according to the present invention. This embodiment differs from the embodiment of FIG. 1 in that PRTs 11 and 15 are omitted. Since the transmission / reception sharing means 23 can be used for lightning surge protection, lightning surge protection means can be reduced. Although the example of FIG. 9 shows an example in which both the PRTs 11 and 15 are omitted, only the PRT 11 or only the PRT 15 may be omitted. further,
The embodiment of FIG. 9 is based on the configuration example of FIG.
Similarly, in the configuration examples shown in FIG. 7 to FIG. 7, one or both of the PRTs 11 and 15 may be omitted.

Although not shown, a high-temperature superconductor can be used as a superconducting material when forming the RBF 3 (claim 9). Examples of the high-temperature superconductor include a superconductor containing copper oxide as a component. In some high-temperature superconductors, the critical temperature at which the superconducting state is achieved exceeds 100 K. In such a superconductor, for example, the superconducting state can be obtained only by cooling the liquid nitrogen to a boiling point of about 77.4 K. In addition, the cooling capacity of the cooling means 7 can be reduced, and a smaller and less expensive cryogenic refrigerator can be used. As a result, the high-sensitivity wireless receiver can be made small and inexpensive.

[0037]

As described above, according to the present invention, the transmitting antenna and the receiving antenna are shared by one antenna in the high-sensitivity radio receiver, so that the number of antennas is reduced and the base station equipment can be reduced in size and economy. It becomes possible. Also, when the high-sensitivity wireless receiver is installed outdoors, the high-sensitivity wireless receiver can be protected from lightning surge by providing the lightning surge protection means. Further, by monitoring the pilot signal, it is possible to immediately and reliably detect a failure that has occurred in the reception low-noise amplifier.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of the invention of claim 2;

FIG. 3 is a block diagram showing an embodiment of the invention according to claim 10;

FIG. 4 is a block diagram showing an embodiment of the invention of claim 3;

FIG. 5 is a block diagram showing an embodiment of the invention of claim 4;

FIG. 6 is a block diagram showing an embodiment of the invention of claim 5;

FIG. 7 is a block diagram showing an embodiment of the invention of claim 6;

FIG. 8 is a block diagram showing an embodiment of the invention of claim 7;

FIG. 9 is a block diagram showing an embodiment of the invention of claim 8;

FIG. 10 is a block diagram showing a conventional high-sensitivity wireless receiver.

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-14454 (JP, A) JP-A-7-212966 (JP, A) JP-A-7-74665 (JP, A) JP-A-63-1988 56023 (JP, A) JP-A-56-96541 (JP, A) JP-A-61-12140 (JP, A) JP-A-58-184830 (JP, A) JP-A-9-200069 (JP, A) 60-77641 (JP, U) Tetsuya Mimura, Shoichi Narahashi, Toshio Nojima, Highly Sensitive Measurement System for 2GHz-band Wireless Reception Noise, Proceedings of the 1996 IEICE General Conference Communications 1, Japan, Electronics Information and Communication Society, March 11, 1996, p361 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/06-1/26 H04B 1/38 H04B 1/74 H04B 7/26 H02H 9/04

Claims (10)

(57) [Claims] 1. An antenna, an antenna feeder, a first reception bandpass filter to which a signal from the antenna feeder is input, a reception low noise amplifier connected after the first reception bandpass filter, and a reception low noise An output terminal for outputting an output signal of the amplifier; the first reception bandpass filter and the reception low-noise amplifier are sealed in a heat shield box and cooled by cooling means; An outdoor-installed high-sensitivity wireless receiver in which operating power is supplied and operating power is supplied to the cooling means through a second power supply terminal, wherein the input side of the first reception bandpass filter is provided outside the heat shielding box. A second reception bandpass filter, a transmission bandpass filter, and a coupling for coupling one end of each of the transmission bandpass filter and the second reception bandpass filter to the antenna side A first lightning surge protection means inserted on the antenna side of the coupling circuit; a second lightning surge protection means provided outside the heat shield box on the output side of the reception low noise amplifier; A third lightning surge protection means provided outside the heat shield box between the first power supply terminal and the reception low noise amplifier; and a heat protection means provided between the second power supply terminal and the cooling means. a fourth lightning surge protection means provided outside the shield box making, a fifth lightning surge protection means inserted in the path between the transmission signal input terminal and said transmission band filter, the first reception band filter and the Second reception band filter
And the heat shielding box, the transmission bandpass filter and the coupling circuit
And the first to fifth lightning surge protection means and the cooling means.
A high-sensitivity radio receiver , comprising: a housing for housing the first reception band-pass filter, the first reception band-pass filter being made of a superconducting material, and being brought into a superconducting state by the cooling means. 2. The lightning surge protection means according to claim 1, further comprising a common power supply terminal and a common lightning surge protection means instead of said first and second power supply terminals and said third and fourth lightning surge protection means. A high-sensitivity wireless receiver, wherein output power of a surge protection unit is divided into two by a power distribution unit and supplied to the reception low-noise amplifier and the cooling unit. 3. The method according to claim 1, wherein the first power supply terminal and the third lightning surge protection means are eliminated, and the first power supply terminal and the third lightning surge protection means are provided between the reception low-noise amplifier and the output terminal outside the heat shield box. (2) a power separation filter inserted in series with the lightning surge protection means and separating the operating power supplied through the output terminal from a high-frequency reception signal; and stabilizing the power separated by the power separation filter and receiving the power. A high-sensitivity wireless receiver, comprising: a power stabilizing unit that supplies power to a low-noise amplifier. 4. The high sensitivity according to claim 3, wherein said second power supply terminal and said fourth lightning surge protection means are eliminated, and operating power is also supplied from said power stabilizing means to said cooling means. Radio receiver. 5. A pilot signal generating means for generating a pilot signal having a frequency within an attenuation band of the first reception band filter, the first reception band filter, and the reception signal. A pilot signal injection means inserted into a signal path between the noise amplifiers; a demultiplexing means for demultiplexing the reception signal output from the output terminal and the pilot signal; and a level of the demultiplexed pilot signal. Comparing the level of the pilot signal detected by the level detecting means with a preset threshold value, and when the level of the pilot signal is lower than the threshold value, an alarm signal A high-sensitivity wireless receiver, comprising: a monitoring unit that transmits the signal. 6. A temperature detecting means for detecting a temperature in the heat shielding box, and a pilot signal output from the pilot signal generating means, wherein the pilot signal is modulated in accordance with an output signal of the temperature detecting means. A pilot signal modulating means for supplying to the pilot signal injecting means, and demodulating the pilot signal demultiplexed by the demultiplexing means to obtain temperature information in the heat shielding box, and the temperature information is predetermined. A high-sensitivity wireless receiver comprising: a temperature monitoring unit that sends a temperature alarm signal when the temperature is equal to or higher than a temperature. 7. The temperature detecting means according to claim 6, wherein said temperature detecting means detects a temperature of said first receiving bandpass filter, said receiving low noise amplifier or a cooling member of said cooling means in said heat shielding box. High sensitivity wireless receiver. 8. The high-sensitivity radio receiver according to claim 1, wherein one or both of said first lightning surge protection means and said fifth lightning surge protection means are omitted. . 9. A high-sensitivity radio receiver according to claim 1, wherein said superconducting material is constituted by a high-temperature superconductor. 10. The method according to claim 1, wherein
A high-sensitivity wireless receiver, wherein the antenna feeder is omitted, and the antenna is directly connected to a device housing.