CN202435415U - Wireless network radio frequency jammer based on USB interface - Google Patents

Abstract

The utility model discloses a wireless network radio frequency jammer based on a USB interface, which comprises a USB interface, a voltage stabilizing circuit, a frequency sweep signal generation circuit, a frequency sweep voltage adjustment circuit, a voltage-controlled oscillator, an amplifier and an antenna. The voltage circuit and the amplifier provide working voltage; the voltage stabilizing circuit provides the working voltage for the frequency sweep signal generation circuit and the voltage-controlled oscillator; The frequency-sweeping voltage adjustment circuit divides the input reference control voltage and outputs it to the voltage-controlled oscillator; the radio-frequency interference signal generated by the voltage-controlled oscillator is amplified by the amplifier and radiated out through the antenna. The radio frequency jammer is not only simple in structure, but also can interfere with the downlink signals of the current mainstream wireless Internet and mobile Internet services, preventing computers, laptops and other terminals from losing confidentiality through wireless Internet and mobile Internet.

Description

Wireless network radio frequency jammer based on USB interface

technical field

The utility model relates to a wireless network radio frequency jammer based on a USB interface.

Background technique

At present, the jammers for mobile communications on the market are mainly used to interfere with mobile phones of various systems (such as GSM, CDMA, WCDMA, TD_SCDMA, PHS), block the voice and SMS services of mobile phones in the area of action, and prevent mobile phones in a specific range. Lost, stolen secrets. Jammers are generally desktop devices with 220V AC power supply and external antennas. They are large in size, high in interference power, long in action, and have large radiation to personnel and other equipment.

With the development of wireless Internet (WLAN) and mobile Internet (CDMA2000, WCDMA, TD_SCDMA), cities around the world are building digital cities and smart cities. Mobile phones, laptops and other terminals can easily access wireless Internet and mobile Internet. On the other hand, various hacking activities on the Internet have also been extended to the wireless Internet and mobile Internet accordingly. For terminals such as mobile phones and laptops connected to the wireless Internet and mobile Internet, in addition to physical isolation, even between mobile phones and mobile Internet Disable the wireless network function on terminals such as laptops through software, and hackers can also enable wireless network services and steal information on terminals such as mobile phones and laptops.

In departments involving security and confidentiality, it is necessary to ensure the information security of computers, laptops, etc. Physically isolating the connection with the Internet, wireless Internet, and mobile Internet is a safe and feasible method. Physically isolating the link to the Internet is as simple as disconnecting the connecting cable. For terminals with built-in wireless Internet and mobile Internet access functions, electromagnetic shielding or electromagnetic interference is generally used to block the physical access of the wireless network. It is often difficult and inconvenient to implement electromagnetic shielding on terminals, but it is relatively easy to implement electromagnetic interference on terminals.

At present, there is no jammer specifically aimed at wireless Internet and mobile Internet in the market.

Contents of the invention

In order to overcome the above defects, the utility model provides a wireless network radio frequency jammer based on a USB interface. The radio frequency jammer is not only simple in structure, but also can interfere with the current mainstream wireless Internet and mobile Internet service downlink signals to prevent computer , notebook computers and other terminals through the wireless Internet, mobile Internet information confidentiality.

The technical scheme adopted by the utility model in order to solve the technical problem is: a wireless network radio frequency jammer based on a USB interface, including a USB interface, a voltage stabilizing circuit, a frequency sweep signal generation circuit, a frequency sweep voltage adjustment circuit, and a voltage-controlled oscillation There are several voltage-controlled oscillators, amplifiers and antennas, and the output terminals of the USB interface are respectively electrically connected to the input terminals of the voltage stabilizing circuit and the input terminals of several amplifiers and are voltage stabilizing circuits. and the amplifier to provide working voltage; the output terminal of the voltage stabilizing circuit is electrically connected to the input terminal of the frequency sweep signal generating circuit and the input terminals of several voltage-controlled oscillators respectively, and is used for the frequency sweep signal generating circuit and several voltage-controlled oscillators The output terminal of the frequency sweep signal generating circuit is electrically connected to the input terminal of the frequency sweep voltage adjustment circuit, and the output terminals of the frequency sweep voltage adjustment circuit are respectively electrically connected to the inputs of the several voltage-controlled oscillators. terminal, the frequency sweep signal generating circuit provides the reference control voltage of the sawtooth waveform for the several voltage-controlled oscillators and inputs it to the frequency sweep voltage adjustment circuit, and the frequency sweep voltage adjustment circuit divides the input reference control voltage and output to several voltage-controlled oscillators; the output end of each voltage-controlled oscillator is electrically connected to the input end of an amplifier, and the output end of each amplifier is electrically connected to an antenna, and each voltage-controlled oscillator is electrically connected to an antenna. The radio frequency interference signal generated by the oscillator (the interference signal covers the existing wireless Internet and mobile Internet service frequency bands) is amplified by the amplifier and radiated out through the antenna.

As a further improvement of the present utility model, the voltage-controlled oscillator includes a first voltage-controlled oscillator, a second voltage-controlled oscillator, a third voltage-controlled oscillator and a fourth voltage-controlled oscillator, and the first voltage-controlled oscillator The oscillator produces 869-879MHz radio frequency interference signals suitable for CDMA2000, the second voltage-controlled oscillator produces 2130-2145MHz radio frequency interference signals suitable for WCDMA, and the third voltage-controlled oscillator produces 2010-2145MHz radio frequency interference signals suitable for TD_SCDMA 2025MHz radio frequency interference signal, the fourth voltage controlled oscillator generates 2400-2483MHz radio frequency interference signal suitable for WLAN.

As a further improvement of the utility model, the amplifier includes a first amplifier, a second amplifier, a third amplifier and a fourth amplifier, the antenna includes a first antenna, a second antenna and a third antenna, and the first voltage control The output end of the oscillator is electrically connected to the first amplifier and the first antenna in turn, the output end of the second voltage-controlled oscillator is electrically connected to the second amplifier and the second antenna in turn, and the output end of the third voltage-controlled oscillator is in turn The third amplifier is electrically connected to the second antenna, and the output terminal of the fourth voltage-controlled oscillator is electrically connected to the fourth amplifier and the third antenna in turn.

As a further improvement of the utility model, the frequency sweep signal generating circuit generates a sawtooth wave voltage with a peak value of 0-3V, the frequency of the sawtooth wave voltage is 60-75KHz, and the frequency sweep voltage adjustment circuit divides the voltage through a resistor and Generate four sets of sawtooth wave voltages of 1.50-1.85V, 2.06-2.16V, 0.93-1.16V, and 1.00-1.93V to supply the first voltage-controlled oscillator, the second voltage-controlled oscillator, the third voltage-controlled oscillator and fourth voltage controlled oscillator.

As a further improvement of the utility model, the first antenna and the second antenna are both PIFA antennas, and the third antenna is a CHIP antenna, which can reduce the influence between antennas and ensure the radiation efficiency of the antennas in a small space.

As a further improvement of the utility model, the voltage range of the voltage stabilizing circuit is 4.7-5.5V.

The beneficial effects of the utility model are: the jammer can be made into a structure similar to that of an ordinary U disk, and it is convenient to use; it is powered by a USB interface, and is suitable for a wide voltage range of a general USB interface, ensuring the frequency and amplitude of radio frequency interference signals. Stability; using simulation optimization design, the RF antenna and circuit structure are conformal to ensure the radiation efficiency of the antenna in a small space. In short, the jammer can interfere with the downlink signals of wireless Internet and mobile Internet services,

Description of drawings

Fig. 1 is a schematic diagram of the structure principle of the utility model.

In conjunction with the accompanying drawings, the following descriptions are made:

1——USB interface 2——Voltage regulator circuit

3——Sweep frequency signal generation circuit VCO——Voltage Controlled Oscillator

4——Amplifier 5——Antenna

VCO1——the first voltage-controlled oscillator VCO2——the second voltage-controlled oscillator

VCO3——the third voltage-controlled oscillator VCO4——the fourth voltage-controlled oscillator

41——First Amplifier 42——Second Amplifier

43——The third amplifier 44——The fourth amplifier

51——First Antenna 52——Second Antenna

53——The third antenna 6——Sweep frequency voltage adjustment circuit

Detailed ways

A wireless network radio frequency jammer based on a USB interface, comprising a USB interface 1, a voltage stabilizing circuit 2, a frequency sweep signal generation circuit 3, a frequency sweep voltage adjustment circuit 6, a voltage controlled oscillator VCO, an amplifier 4 and an antenna 5, the There are several voltage-controlled oscillators, amplifiers and antennas, and the output terminals of the USB interface are respectively electrically connected to the input terminals of the voltage stabilizing circuit and the input terminals of several amplifiers and provide operating voltages for the voltage stabilizing circuit and the amplifiers; The output terminal of the voltage stabilizing circuit is electrically connected to the input terminal of the frequency sweep signal generating circuit and the input terminals of several voltage-controlled oscillators respectively, and provides working voltage for the frequency sweep signal generating circuit and several voltage-controlled oscillators; The output end of the frequency signal generating circuit is electrically connected to the input end of the frequency sweep voltage adjustment circuit, and the output ends of the frequency sweep voltage adjustment circuit are respectively electrically connected to the input ends of the plurality of voltage-controlled oscillators, and the frequency sweep signal is generated The circuit provides reference control voltages with sawtooth waveforms for the several voltage-controlled oscillators and inputs them to the frequency-sweeping voltage adjustment circuit, and the frequency-sweeping voltage adjustment circuit divides the input reference control voltages and outputs them to several voltage-controlled oscillators The output end of each voltage-controlled oscillator is electrically connected to the input end of an amplifier respectively, and the output end of each amplifier is electrically connected to an antenna respectively, and the radio frequency interference signal ( The interference signal covers the existing wireless Internet and mobile Internet service frequency bands) and is amplified by the amplifier and then radiated out by the antenna.

Preferably, the voltage-controlled oscillator includes a first voltage-controlled oscillator VCO1, a second voltage-controlled oscillator VCO2, a third voltage-controlled oscillator VCO3, and a fourth voltage-controlled oscillator VCO4, and the first voltage-controlled oscillator generates The 869-879MHz radio frequency interference signal suitable for CDMA2000, the second voltage-controlled oscillator produces a 2130-2145MHz radio frequency interference signal suitable for WCDMA, and the third voltage-controlled oscillator produces a 2010-2025MHz radio frequency signal suitable for TD_SCDMA For radio frequency interference signals, the fourth voltage-controlled oscillator generates radio frequency interference signals of 2400-2483 MHz suitable for WLAN.

Preferably, the above-mentioned amplifier includes a first amplifier 41, a second amplifier 42, a third amplifier 43 and a fourth amplifier 44, the antenna includes a first antenna 51, a second antenna 52 and a third antenna 53, and the first voltage The output end of the controlled oscillator is electrically connected to the first amplifier and the first antenna in turn, the output end of the second voltage controlled oscillator is electrically connected to the second amplifier and the second antenna in turn, and the output end of the third voltage controlled oscillator The third amplifier and the second antenna are electrically connected in sequence, and the output terminal of the fourth voltage-controlled oscillator is electrically connected to the fourth amplifier and the third antenna in sequence.

Preferably, the frequency sweep signal generation circuit generates a sawtooth wave voltage with a peak value of 0-3V, the frequency of the sawtooth wave voltage is 60-75KHz, and the frequency sweep voltage adjustment circuit divides the voltage through resistors to generate 1.50-1.85V respectively , 2.06 ~ 2.16V, 0.93 ~ 1.16V, 1.00 ~ 1.93V four sets of sawtooth wave voltage are respectively supplied to the first voltage controlled oscillator, the second voltage controlled oscillator, the third voltage controlled oscillator and the fourth voltage controlled oscillator .

Preferably, the above-mentioned first antenna and the second antenna are both PIFA antennas, and the third antenna is a CHIP antenna, which can reduce the influence between the antennas and ensure the radiation efficiency of the antennas in a small space.

Preferably, the voltage range of the voltage stabilizing circuit is 4.7-5.5V.

Claims (6)

1. A wireless network radio frequency jammer based on a USB interface, characterized in that: it comprises a USB interface (1), a voltage stabilizing circuit (2), a frequency sweep signal generation circuit (3), a frequency sweep voltage adjustment circuit (6) , a voltage-controlled oscillator (VCO), an amplifier (4) and an antenna (5), the voltage-controlled oscillator, the amplifier and the antenna are several, and the output ends of the USB interface are electrically connected to the input of the voltage stabilizing circuit respectively terminal and the input terminals of several amplifiers and provide operating voltage for the voltage stabilizing circuit and the amplifier; the output terminals of the voltage stabilizing circuit are respectively electrically connected to the input terminals of the frequency sweep signal generating circuit and the input terminals of several voltage-controlled oscillators and provide The frequency-sweeping signal generation circuit and several voltage-controlled oscillators provide working voltage; the output end of the frequency-sweeping signal generation circuit is electrically connected to the input end of the frequency-sweeping voltage adjustment circuit, and the output end of the frequency-sweeping voltage adjustment circuit The input terminals of the several voltage-controlled oscillators are respectively electrically connected, and the frequency-sweeping signal generating circuit provides the reference control voltage of the sawtooth waveform for the several voltage-controlled oscillators and inputs it to the frequency-sweeping voltage adjustment circuit. The frequency voltage adjustment circuit divides the input reference control voltage and outputs it to several voltage-controlled oscillators; the output end of each voltage-controlled oscillator is electrically connected to the input end of an amplifier, and the output of each amplifier The terminals are respectively electrically connected to an antenna, and the radio frequency interference signal generated by each voltage-controlled oscillator is amplified by the amplifier and then radiated out through the antenna. 2. The wireless network radio frequency jammer based on USB interface according to claim 1, characterized in that: said voltage-controlled oscillator comprises a first voltage-controlled oscillator (VCO1), a second voltage-controlled oscillator (VCO2), The third voltage-controlled oscillator (VCO3) and the fourth voltage-controlled oscillator (VCO4), the first voltage-controlled oscillator produces the 869-879MHz radio frequency interference signal suitable for CDMA2000, and the second voltage-controlled oscillator produces The 2130-2145MHz radio frequency interference signal suitable for WCDMA, the third voltage-controlled oscillator produces the 2010-2025MHz radio frequency interference signal suitable for TD_SCDMA, and the fourth voltage-controlled oscillator produces the 2400-2483MHz radio frequency interference signal suitable for WLAN radio frequency interference signal. 3. The wireless network radio frequency jammer based on USB interface according to claim 2, characterized in that: said amplifier comprises a first amplifier (41), a second amplifier (42), a third amplifier (43) and a fourth amplifier Amplifier (44), the antenna includes a first antenna (51), a second antenna (52) and a third antenna (53), the output end of the first voltage-controlled oscillator is electrically connected to the first amplifier and the first antenna, the output end of the second voltage-controlled oscillator is electrically connected to the second amplifier and the second antenna in turn, the output end of the third voltage-controlled oscillator is electrically connected to the third amplifier and the second antenna in turn, and the fourth The output end of the voltage controlled oscillator is electrically connected to the fourth amplifier and the third antenna in turn. 4. The wireless network radio frequency jammer based on the USB interface according to claim 2, characterized in that: the frequency sweep signal generating circuit generates a sawtooth wave voltage with a peak value of 0-3V, and the frequency of the sawtooth wave voltage is 60-3V 75KHz, the frequency sweep voltage adjustment circuit divides the voltage through resistors and generates four sets of sawtooth wave voltages of 1.50-1.85V, 2.06-2.16V, 0.93-1.16V, and 1.00-1.93V to supply the first voltage-controlled oscillator respectively , the second voltage-controlled oscillator, the third voltage-controlled oscillator and the fourth voltage-controlled oscillator. 5. The wireless network radio frequency jammer based on USB interface according to any one of claims 2 to 4, characterized in that: the first antenna and the second antenna are PIFA antennas, and the third antenna is CHIP antenna. 6. The wireless network radio frequency jammer based on the USB interface according to claim 5, wherein the voltage range of the voltage stabilizing circuit is 4.7-5.5V.

Images