KR20010036126A - Jammer for portable communication system - Google Patents

Abstract

PURPOSE: An apparatus for blocking electric waves of mobile communication equipment is provided to block automatically the communications service of the mobile communication equipment by mixing an interference signal in the wave signal transmitted and received to/from the mobile communication equipment. CONSTITUTION: A reference frequency generation unit(104) generates a reference frequency to form an RF(Radio Frequency) signal for interference. A noise generation unit(106) generates a predetermined band of noise signal to send to a mixer(108). The mixer(108) generates the mixed signal, which is mixed the reference frequency with the noise signal, to send to a band pass filter(110). The band pass filter(110) extracts a desired band of RF signal from the mixed signal. The extracted RF signal is amplified in an amplifier(114), and transmitted to the air via antenna(116). Then, the range of the extracted RF signal for interference is shorter than that of the mobile communication equipment.

Description

Jamming device for portable communication device {JAMMER FOR PORTABLE COMMUNICATION SYSTEM}

The present invention relates to a device for blocking radio waves of a portable communication device, and more particularly, to a portable communication device suitable for blocking transmission of radio waves from a portable communication device such as a cellular phone, a personal mobile communication (PCS), a pager, or the like. It relates to a radio wave shielding device.

In recent years, with the development of semiconductor technology, electronic technology, communication technology, etc., the demand for wireless mobile communication (or portable communication device), for example, cellular mobile phone, personal mobile communication (PCS), two-way payer, etc. is rapidly increasing. It is spreading rapidly, and from the time when the broadband wireless mobile terminal (also called IMT-2000), which is globally standardized (or standardized), aims to launch a multimedia service, Demand growth will accelerate further.

On the other hand, a mobile communication system for implementing wireless mobile communication as described above includes a mobile switching center, a base station controller, a base station and mobile terminals (portable communication devices), wherein the mobile switching center and the base station controller and the base station controller and the base station are wired. On the other hand, wireless communication is performed between the base station and portable communication devices (mobile terminals) in the service area of the base station.

Therefore, the radio signals transmitted from the antenna of the base station to each mobile terminal in the service area have a predetermined level of radio wave strength so that smooth communication between the base station and each mobile terminal can be performed. Radio waves transmitted through them also have a certain level of intensity.

On the other hand, the radio wave transmitted from the mobile terminal during the call using the mobile terminal is a variety of experiments in other electronic devices (e.g., medical equipment, aeronautical operation electronic equipment mounted on airplanes, etc.) adjacent to their surroundings It is known to cause malfunction of the equipment by affecting the equipment).

Therefore, the use of portable communication devices is prohibited in medical institutions (hospitals, clinics, oriental medical centers, etc.), airplanes, and research institutes to prevent accidents that may be caused by radio waves transmitted from mobile terminals. In order for everyone in the room to recognize the prohibition of the use of portable communication devices, warning signs on the prohibition of use are attached.

However, as described above, the method of prohibiting the use of the portable communication device by attaching a warning message for prohibiting the use of the portable communication device could not fundamentally solve the prohibition of the use of the portable communication device.

In other words, in order not to use the portable communication device that he owns in the prohibited area, the power of the portable communication device must be turned off.For example, a user who enters a hospital cannot see the usage warning message attached to an entrance or the like. You may or may not have accidentally turned off your portable communications device. In this case, if a ringing tone (or ringing tone) rings on the user's portable communication device, the user may make the mistake of receiving a call without thinking, which is a radio transmission from a portable communication device in a prohibited area. That is, the radio waves that may cause malfunction of the medical device is transmitted from the portable communication device.

Therefore, the method of prohibiting the use of the portable communication device by using the use prohibition warning phrase, etc., as described above, the mistake of using the portable communication device in the use prohibition area due to the user's mistake, causing the medical device to malfunction. There is a problem in that it is fundamentally unable to solve the ban on the use of portable communication equipment, which is necessary in a certain area because of the violation.

Also, in public places where limited quietness is required, such as libraries, classrooms, conference rooms, cinemas, concert halls, churches, cathedrals, etc. It is necessary to suppress or prohibit its use because it can act as a function, and it has been difficult to suppress or prohibit the use of a portable communication device due to the above-described reasons (not to accidentally turn off the power of the portable communication device).

The present invention is to solve the above-mentioned problems of the prior art, a portable that can automatically cut off the communication service of the portable communication device by interfering with the interference signal to the radio wave transmitted or transmitted to the portable communication device in the predetermined restricted area An object of the present invention is to provide a radio wave shielding device for a communication device.

The present invention according to one embodiment for achieving the above object is an apparatus for cutting off radio waves of a portable communication device that transmits and receives various data through wireless communication with a base station, the device corresponding to a frequency band used in the portable communication device. Reference frequency generating means for generating a reference frequency; Noise generating means for generating a noise signal to be mixed with the reference frequency; Means for mixing the generated reference frequency and the noise signal to generate a mixed signal, and filtering the generated mixed signal to generate an RF signal for radio wave interference in a specific frequency band; Amplifying means for amplifying the generated radio wave interference RF signal to a predetermined level having a predetermined radio wave reaching distance; And an antenna for transmitting the amplified RF signal for radio wave interference.

According to another aspect of the present invention, there is provided a device for blocking radio waves of a portable communication device that transmits and receives various data through wireless communication with a base station, wherein the overall operation of the blocking device is based on a user operation signal. Control means for generating various operation control signals for performing control; In response to the operation control signal from the control means, in a mixed signal obtained by generating a first reference frequency and a first noise signal having an arbitrary center frequency and mixing the generated first reference frequency and the first noise signal First radio wave blocking means for generating a first radio wave interference RF signal of a specific frequency band extracted, and amplifying the generated first radio wave interference RF signal to a predetermined level having a predetermined radio wave propagation distance and transmitting it to the air; And in response to an operation control signal from the control means, generates a second reference frequency and a second noise signal having an arbitrary center frequency different from the first reference frequency, the generated second reference frequency and the second noise signal. Extracting from the mixed signal obtained by mixing the noise signals, generating a second radio wave interference RF signal of a specific frequency band different from the frequency band of the first radio wave interference RF signal, the generated second radio wave interference RF Provided is a radio wave shielding device for a portable communication device, comprising a second radio wave blocking means for amplifying a signal to a predetermined level having a predetermined radio wave arrival distance and transmitting the signal to the air.

1 is a block diagram of a radio wave shielding device of a portable communication device according to an embodiment of the present invention;

2 is a block diagram of a radio wave shielding apparatus of a portable communication device according to another embodiment of the present invention;

3 is an output waveform diagram in each block employed in the present invention.

<Description of the code | symbol about the principal part of drawing>

102,210: control block 104,231,251: reference frequency generation block

106,232,252: Noise generating block 108,233,253: Mixer

110,234,254: band pass filter 112,240: power control block

114,235,255: Amplifier 116,236,256: Antenna

230,250: Jammers

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a key technical aspect of the present invention is to use a interference RF signal having a limited reach generated by itself and transmitted to the air through an antenna, in a specific area (that is, an area set as a prohibited area for use of a portable communication device). The present invention provides a method of automatically blocking radio waves of a portable communication device, and incorporates an interference RF signal into radio signals (transmission wave and reception wave) to prevent the portable communication device from performing a communication service. You can achieve what you want.

1 is a block diagram of a radio wave shielding apparatus of a portable communication device according to a preferred embodiment of the present invention, including a control block 102, a reference frequency generating block 104, a noise generating block 106, a mixer 108, A band pass filter (BPF) 110, a power control block 112, an amplifier (AMP) 114, and an antenna 116.

Referring to FIG. 1, the control block 102 includes, for example, a microprocessor, to perform overall operation control of the tank blocking device according to the present invention, and to turn off an operation signal (operator operation) not shown. Signal is inputted, the power of the radio wave shielding device is turned off, and an operation control signal is generated on the lines L11 and L13 in response to the on operation signal being input, respectively, so that the reference frequency generating block 104 and the noise generating block ( 106 each.

In addition, the reference frequency generating block 104 generates a reference frequency required to generate an interference RF signal in response to an operation control signal provided from the control block 102 via the line L11, for example, a radio wave blocking device. Is for a cellular phone using a frequency band of 869 MHz to 869 MHz, for example, generates a reference frequency with a center frequency fo of 881.5 MHz and provides it to the mixer 108 as shown in FIG. When the device is for personal mobile communication using the frequency band 1840 MHz-1870 MHz, a reference frequency with a center frequency of 1855 MHz is generated and provided to the mixer 108.

Next, the noise generating block 106 generates a noise signal having a predetermined band as shown in FIG. 3B as an example in response to an operation control signal provided from the control block 102 through the line L13. To mixer 108.

The mixer 108, on the other hand, mixes the reference frequency provided from the reference frequency generating block 104 with the noise signal provided from the noise generating block 106, e.g., with the reference frequency as shown in Figure 3A and in Figure 3B. By mixing the noise signal as shown, as an example, a mixed signal having a waveform as shown in FIG. 3C is generated, and the mixed signal generated here is transferred to the next band pass filter 110.

In addition, the band pass filter 110 extracts only a signal of a band required from the mixed signal transmitted from the mixer 108, and filters the waveform as shown in FIG. Only the signal of the band as filled with is extracted, and the extracted RF signal is transferred to the amplifier 114 of the next stage.

Next, the amplifier 114 amplifies the extracted RF signal (that is, the RF signal for radio wave interference) to a predetermined predetermined level and then transfers the RF signal to the antenna 116, so that the radio wave interference RF signal through the antenna 116 is performed. Is sent to the air (i.e., to a preset radio wave limited area with a limited reach). At this time, the radio wave interference RF signal transmitted is weaker than the reach of the portable communication device (for example, cellular phone, personal mobile communication, two-way pager, etc.) that aims to block the radio wave. .

Accordingly, the radio wave interference RF signal transmitted to the air through the antenna 116 is mixed with the radio wave signal transmitted from the adjacent base station. As a result, the place where the radio wave shielding device according to the present invention is installed, i.e., the use of a portable communication device is prohibited. Since portable communication devices entering the area cannot detect the radio wave transmitted from the base station, the communication service is forced off.

Therefore, since the portable communication device cannot receive the radio wave provided from the base station, it is surely prevented from using the portable communication device in the prohibited area. In this case, a text message indicating a non-service area will be displayed on the display panel of the portable communication device.

In addition, if a text message indicating a non-service area is not displayed on the display panel of the portable communication device, the user may forget the use area and accidentally attempt to make a phone call. Since the interference RF signal is mixed in the radio wave transmitted from the base station, the base station cannot detect this properly, and as a result, it is possible to reliably prevent the call transmission using the corresponding portable communication device.

On the other hand, the radio wave blocking device according to the present invention further comprises a power control block 112 for adjusting the power amplification level in the amplifier 114 according to the operation signal (installer or operator operation signal) provided from the external switch not shown. Include.

That is, the electric wave blocking device according to the present invention is a power capable of adjusting the power level of the radio wave interference RF signal transmitted through the antenna 116 according to the radio wave strength (that is, the reception strength of the radio wave transmitted from the base station) of the installed place And a control block 112, in which the amplifier 114 selectively adjusts the amplification level of the RF signal according to the control signal from the power control block 112.

For example, when the radio wave shielding device is installed in a place where the radio wave strength is relatively high, determine the interference RF signal as the maximum output, and when the radio wave strength is relatively low, By determining the minimum output, it is possible to even out the restricted area to block the radio waves.

In addition, by changing the power level of the interference RF signal output through the antenna as described above, it is possible to flexibly operate the blocking range for one radio wave blocking device.

On the other hand, in the preferred embodiment of the present invention described above by using an external switch, the installation operator or the operator has been described as manually adjusting the power level of the interference RF signal output, but the present invention is not necessarily limited thereto. . That is, the radio wave shielding apparatus of the present invention may further include a radio wave intensity detector, and may be configured to adaptively and automatically adjust the power level of the interference RF signal output based on the radio wave intensity detected therein.

Moreover, in the above-described preferred embodiment of the present invention, the operator described using the external switch to turn on / off the radio wave blocking device, but the present invention is not necessarily limited thereto.

That is, the radio wave blocking device of the present invention further comprises an infrared detector for detecting an infrared signal transmitted from the remote control, and configured to transmit the output of the infrared detector to the control block, thereby turning on / off the radio wave blocking device according to the present invention. Operation can also be controlled remotely.

2 is a block diagram of a radio wave blocking apparatus of a portable communication device according to another embodiment of the present invention.

Referring to FIG. 2, unlike the embodiment shown in FIG. 1, which generates only one radio wave interference RF signal, the present embodiment may respectively generate two radio wave interference RF signals having different frequency bands. The only difference is that the signals are transmitted through the antenna, and the functions performed by the corresponding components are substantially the same.

That is, the wave blocking device according to the present embodiment includes a control block 210, a first wave breaker 230, a power control block 240 and a second wave breaker 250, two wave breakers 230 , 250 differs in that it shares the control block 210 and the power control block 240, the configuration in each of the circuit breakers is substantially the same as those in the above-described embodiment.

Thus, the first reference frequency generation block 231, the first noise generation block 232, the first mixer 233, the first band pass filter 234, the first amplifier 235, and the first antenna 236. Assuming that the first jammer 230 is configured to correspond to the cellular phone as an example, the center frequency in accordance with the operation control signal provided through the lines L21 and L23 and the control signal provided from the power control block 240 Will generate a radio wave interference RF signal of 881.5MHz and transmit it through the antenna 236.

In addition, the second reference frequency generation block 251, the second noise generation block 252, the second mixer 253, the second band pass filter 254, the second amplifier 255, and the second antenna 256. Assuming that the second circuit breaker 250 is configured to correspond to personal portable communication (PCS) as an example, the operation control signal provided through the lines L22 and L24 and the control signal provided from the power control block 240 As a result, a radio frequency interference RF signal having a center frequency of 1855 MHz will be generated and transmitted through the antenna 256.

Therefore, when the radio wave shielding device according to the present embodiment, which generates radio wave interference RF signals corresponding to cellular phones and personal mobile communication, respectively, is installed at an arbitrary place, the use of the radio communication device is prohibited. It is possible to reliably realize the prohibition of the use of cellular phones and personal mobile communications in the region.

On the other hand, the radio wave blocking device according to the present embodiment, as in the above embodiment, automatically adjusts the level of the radio wave interference RF signal output by adding a radio wave intensity detector, and adds an infrared detector to On / off control can be performed remotely.

On the other hand, the present embodiment has been described a configuration that generates only two interference RF signals having different frequency bands, but those skilled in the art to expand to generate more than one interference RF signal as needed It will be clear that it can be done.

As described above, according to the present invention, a radio wave interference RF signal having a limited radio wave reach distance is generated, and the generated radio wave interference RF signal is mixed with a radio wave transmitted from a base station and a radio wave transmitted from a portable communication device to generate a base station. By intercepting communication services between the portable communication device and a portable communication device, it is possible to enter certain restricted areas (i.e. reach of interference RF signals in areas where radio wave protection devices are installed (hospitals, airplanes, conference rooms, lecture rooms, etc.)). The ban on the use of portable communication equipment can be reliably realized.

Claims (12)

An apparatus for cutting off radio waves of a portable communication device that transmits and receives various data through wireless communication with a base station, Reference frequency generating means for generating a reference frequency corresponding to a frequency band used in the portable communication device; Noise generating means for generating a noise signal to be mixed with the reference frequency; Means for mixing the generated reference frequency and the noise signal to generate a mixed signal, and filtering the generated mixed signal to generate an RF signal for radio wave interference in a specific frequency band; Amplifying means for amplifying the generated radio wave interference RF signal to a predetermined level having a predetermined radio wave reaching distance; And Radio wave blocking device of a portable communication device comprising an antenna for transmitting the amplified radio wave interference RF signal. The radio wave blocking device of claim 1, further comprising means for selectively adjusting an amplification level of the amplifying means according to a manual operation signal of an external user. The radio wave shield according to claim 1, wherein: Means for detecting the strength of radio waves transmitted from the base station; And And a means for adaptively adjusting an amplification level in said amplifying means on the basis of a radio wave strength detecting signal provided from said propagation intensity detecting means. The portable communication device of claim 1, further comprising a detector configured to detect an infrared signal provided from the outside and controlled on / off according to a remote control signal provided from a remote controller. Jamming device. The radio wave shielding device of a portable communication device according to any one of claims 1 to 4, wherein said portable communication device is a cellular phone. The radio wave shielding device according to any one of claims 1 to 4, wherein the portable communication device is personal portable communication (PCS). The radio wave shielding device according to any one of claims 1 to 4, wherein the portable communication device is a bidirectional pager. An apparatus for cutting off radio waves of a portable communication device that transmits and receives various data through wireless communication with a base station, Control means for generating various operation control signals for performing overall operation control of the blocking device based on a user operation signal; In response to the operation control signal from the control means, in a mixed signal obtained by generating a first reference frequency and a first noise signal having an arbitrary center frequency and mixing the generated first reference frequency and the first noise signal First radio wave blocking means for generating a first radio wave interference RF signal of a specific frequency band extracted, and amplifying the generated first radio wave interference RF signal to a predetermined level having a predetermined radio wave propagation distance and transmitting it to the air; And In response to an operation control signal from the control means, a second reference frequency and a second noise signal having an arbitrary center frequency different from the first reference frequency are generated, the generated second reference frequency and second noise Extracting from the mixed signal obtained by mixing the signals, generating a second radio wave interference RF signal of a specific frequency band different from the frequency band of the first radio wave interference RF signal, the generated second radio wave interference RF signal And a second radio wave blocking means for amplifying the signal to a predetermined level having a preset radio wave reaching distance and transmitting it to the air. 9. The portable communication apparatus according to claim 8, wherein the radio wave blocking device further comprises means for selectively adjusting amplification levels of the first and second radio wave interference RF signals according to a manual operation signal of an external user. Device jamming device. 9. The radio wave shield of claim 8, wherein: Means for detecting the strength of radio waves transmitted from the base station; And Means for adaptively adjusting the amplification levels of the first and second radio wave interference RF signals based on the radio wave strength detection signal provided from the radio wave intensity detecting means. Blocking device. 10. The apparatus of claim 8, wherein the radio wave blocking device further comprises a detector for detecting an infrared signal provided from the outside, and the control means includes the first and second radio wave blocking means in accordance with a remote control signal provided from a remote controller at a remote location. Radio blocking device of a portable communication device, characterized in that for controlling the on / off. 12. The apparatus of any one of claims 8-11, wherein each of the first and second jamming means is: Reference frequency generating means for generating a reference frequency corresponding to a frequency band used in the portable communication device; Noise generating means for generating a noise signal to be mixed with the reference frequency; Means for mixing the generated reference frequency and the noise signal to generate a mixed signal, and filtering the generated mixed signal to generate an RF signal for radio wave interference in a specific frequency band; Amplifying means for amplifying the generated radio wave interference RF signal to a predetermined level having a predetermined radio wave reaching distance; And The apparatus of claim 1, further comprising an antenna for transmitting the amplified RF signal for radio wave interference.