CN210111993U

CN210111993U - Portable wireless communication anti-interference device

Info

Publication number: CN210111993U
Application number: CN201921746785.1U
Authority: CN
Inventors: 陈万里; 柴远波; 李伟; 王恒博; 谢震北
Original assignee: Huanghe Science and Technology College
Current assignee: Huanghe Science and Technology College
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-02-21
Anticipated expiration: 2029-10-18

Abstract

The utility model discloses a portable wireless communication anti jamming unit, including mainboard and antenna, the wireless communication signal input that the antenna produced the mainboard is transmitted to the antenna-emitting end behind band-pass filter circuit, impedance matching circuit and the amplified voltage stabilizing circuit. The problem that the transmission and receiving quality of the wireless communication signals are affected due to the fact that the wireless communication signals are subjected to external interference and attenuation in transmission and the switching speed of a circuit is reduced is effectively solved. The utility model discloses the interference signal filtering outside 500 supplyes 940 MHz's wireless communication signal input that the mainboard that receives the antenna by band-pass filter circuit produced, again through impedance matching circuit suppression wireless communication signal in the reflection interference that transmission process produced, amplify wireless communication signal after amplifying voltage stabilizing circuit at last, promote triode Q1 and optoelectronic coupler U2's switching speed, on the stable back retransmission of holding circuit operating voltage is to the antenna emission end, wireless communication signal's interference killing feature has been improved and the switching speed of circuit has been promoted.

Description

Portable wireless communication anti-interference device

Technical Field

The utility model relates to a wireless communication technology field, especially portable wireless communication anti jamming unit.

Background

The prior art is as follows: the portable wireless communication device of application No. 200620000641.8, which is a wireless communication device including an antenna, such as a tablet computer or a notebook computer, is covered by a housing made of a material having an electric wave isolating function, so as to prevent radio frequency interference generated by electronic components on the main board from affecting the operation of the main board and prevent the wireless communication signal from causing the reduction of signal transmission and reception efficiency when transmitting to the antenna. However, the method of using the housing to cover the motherboard causes inconvenience in use, radio frequency interference generated by electronic components on the motherboard and electromagnetic interference, adjacent frequency interference and noise interference generated by the environment, which affect the transmission and reception quality of wireless communication signals, cannot be inhibited without using the housing for covering, the electronic components in the circuit also cause the reduction of the switching speed of the circuit after long-time operation, and the wireless communication signals cause amplitude attenuation when being transmitted to the antenna transmitting end.

Therefore, the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a portable wireless communication signal interference device, has design ingenious, humanized design, and the effectual wireless communication signal that has solved receives external disturbance's influence, the switching speed of circuit reduces, the range decay leads to the problem that the quality received the influence when wireless communication signal transmission, receipt when transmitting.

The technical scheme includes that the wireless communication signal processing circuit comprises a mainboard and an antenna, the antenna receives a wireless communication signal input generated by the mainboard, the wireless communication signal is transmitted outwards through an antenna transmitting end, the wireless communication signal is transmitted to the antenna transmitting end through a band-pass filter circuit, an impedance matching circuit and an amplifying and stabilizing circuit in sequence, the band-pass filter circuit achieves the effect of filtering interference signals except the wireless communication signal of 500-940MHz received by the antenna, the purpose of suppressing reflection interference generated in the transmission process of the wireless communication signal is achieved through the impedance matching circuit, then the wireless communication signal is amplified through the amplifying and stabilizing circuit by using a triode Q1, the switching speed of the triode Q1 and a photoelectric coupler U2 is improved, the stability of a holding circuit is improved, and finally the wireless communication signal is transmitted to the antenna transmitting end, the purposes of improving the anti-interference capability of wireless communication signals and increasing the switching speed of a circuit are achieved.

The utility model discloses a wireless communication signal input that the antenna receiving mainboard produced firstly passes through the effect of the band pass filter that passes through in the band pass filter circuit resistance R1, electric capacity C1, electric capacity C2 and resistance R2 constitute and will remove the signal of other frequencies except 500 and supplyes 940MHz wireless communication signal, then get into the impedance matching circuit that is acted on by variable capacitance C4, inductance L1 and variable capacitance C5 cooperation, thereby restrain the reflection interference that 500 supplyes 940MHz wireless communication signal self produced, finally get into the amplifier voltage stabilizing circuit and utilize triode Q1 to amplify wireless communication signal, utilize schottky diode D4 to promote switching speed for triode Q1, utilize phototriode base positive feedback circuit with triode Q2 as the core to improve the switching speed of optoelectronic coupler U2, reuse controllable accurate source U3 and triode Q2 stabilizing circuit's operating voltage, and finally, the wireless communication signal is transmitted to the antenna transmitting end, so that the problem that the transmission and receiving quality of the wireless communication is influenced because the switching speed of a circuit is reduced due to the fact that the wireless communication signal is interfered and attenuated by the outside during transmission is solved.

Drawings

Fig. 1 is a schematic diagram of a bandpass filter circuit in the circuit of the present invention.

Fig. 2 is a schematic diagram of an impedance matching circuit in the circuit of the present invention.

Fig. 3 is a schematic diagram of an amplifying voltage stabilizing circuit in the circuit of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1-3. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

The band-pass filter circuit filters interference signals outside a 500-940MHz wireless communication signal input generated by a mainboard received by an antenna through a band-pass filter consisting of a resistor R1, a capacitor C1, a capacitor C2 and a resistor R2, then the interference signals pass through an impedance matching circuit, the impedance matching of the circuit is realized by using the function of the impedance matching circuit consisting of a variable capacitor C4, a variable capacitor C5 and an inductor L1, so that the reflection interference generated in the transmission process of the wireless communication signals is inhibited, then the wireless communication signals are amplified by using a triode Q1 through an amplifying and voltage stabilizing circuit, the switching speed is increased by using a Schottky diode D4 as a triode Q1, the switching speed of a photoelectric coupler U2 is increased by using a phototriode base positive feedback circuit consisting of a triode Q2 as a core, and the time for the photoelectric-photoelectric conversion of the photoelectric coupler U2 on the wireless communication signals is shortened, a voltage stabilizing circuit which is composed of a controllable precise voltage stabilizing tube U3 and a triode Q3 as cores is used for keeping the stability of the circuit, so that the transmission of wireless communication signals without impurities is realized, the anti-jamming capability of the wireless communication signals is improved, and the switching speed of the circuit is increased;

the band-pass filter circuit filters interference signals except the wireless communication signals by a band-pass filter composed of a resistor R1, a capacitor C1, a capacitor C2 and a resistor R2 from 500-940MHz wireless communication signals received by an antenna, a low-pass filter composed of a resistor R1 and a capacitor C1 filters interference signals lower than 500MHz, a high-pass filter composed of a capacitor C2 and a resistor R2 filters interference signals higher than 940MHz, a phase correction network composed of a resistor R3 and a capacitor C3 eliminates an additional phase generated by the band-pass filter to the filtered interference signals, so that the circuit only remains the wireless communication signals of 500-940MHz, the interference signals are ensured not to generate interference to the wireless communication signals, normal transmission of the wireless communication signals is not influenced, and an overvoltage protection circuit is formed by reversely connecting a diode D1 and a diode D2 in parallel to an operational amplifier U1B, the amplifier circuit protects the input end of the operational amplifier U1B from being damaged due to excessive current, and further obtains a gain unit of the operational amplifier U1B by using a resistor R3 as a negative feedback resistor, so that the operational amplifier U1B is stably controlled, the amplifier circuit comprises a resistor R1, one end of the resistor R1 is connected with a wireless communication signal input, the other end of the resistor R1 is respectively connected with one end of a capacitor C1 and one end of a capacitor C2, the other end of the capacitor C1 is connected with the ground, the other end of the capacitor C2 is respectively connected with one end of a resistor R2, one end of a resistor R3 and one end of a capacitor C3, one end of a resistor R2 is connected with the ground, the other end of a resistor R3 is respectively connected with one end of a resistor R4, the inverting input end of the operational amplifier U1B, the negative electrode of a diode D1 and the positive electrode of a diode D2, the other end of a resistor C3 is respectively connected with the non-inverting input end of the operational amplifier U1B, the positive electrode of the diode, the other end of the resistor R5 is connected to ground, the other end of the resistor R4 is respectively connected to the output end of the operational amplifier U1B, the other end of the resistor R6 is connected to the network label 1, and two power supply pins of the operational amplifier U1B are respectively connected to the positive power supply VCC and ground;

the impedance matching circuit performs impedance matching on a wireless communication signal passing through the band-pass filter circuit, suppresses reflection interference generated by the wireless communication signal due to self reasons in the transmission process, realizes effective transmission of the wireless communication signal, the resistor R7 is a current-limiting resistor so as to prevent an electronic element from being damaged by overlarge current passing through the impedance matching circuit and further cannot work normally, impedance matching of the circuit is realized through the combined action of the inductor L1, the variable capacitor C4 and the variable capacitor C5, the original end resistance value can be flexibly adjusted by changing the capacity ratio of the variable capacitor C4 to the variable capacitor C5 so as to further realize matching of the original end resistance value and the load end resistance value, the capacitor C6 is used as a compensation capacitor and is connected in series with the inductor L2 to serve as a resonance point for avoiding harmonic amplification and over-current damage of the capacitor, and plays a role in filtering harmonic waves, and comprises a resistor R7, one end of a resistor R7 is connected with a network label 1, the other end of a resistor R7 is connected with one end of an inductor L1 and one end of a variable capacitor C4, the other end of the inductor L1 is connected with one end of a variable capacitor C5, one end of a capacitor C6 and a network label 2, the other end of a capacitor C6 is connected with one end of the inductor L2, and the other end of a variable capacitor C4 is connected with the other end of the variable capacitor C5 and the other end of the inductor L2 and connected with the network label 3 in parallel;

the amplifying and voltage stabilizing circuit amplifies a wireless communication signal passing through an impedance matching circuit and stabilizes the voltage of the circuit, the switching speed of a triode Q1 and a photoelectric coupler U2 is improved to shorten the reaction time of the circuit, the wireless communication signal passing through the impedance matching circuit is coupled into an amplifying circuit taking the triode Q1 as a core by using a capacitor C7 to be amplified, a resistor R9 is a base electrode bias resistor of a triode Q1 and is used for providing current for the triode so that the triode Q1 always works in a class A distortion-free amplifying state to achieve the best amplifying effect, a diode D3, a resistor R11 and a resistor R12 are used for stabilizing a static working point of the triode Q1 and are not influenced by temperature change, a Schottky diode D4 is used as a Schottky clamping transistor of the triode Q1, when the triode Q1 enters a saturation state, a collector junction of the Schottky diode D4 connected with the triode Q2 is positively biased, because the conduction voltage drop of the Schottky diode is only 0.4V and is about 0.3V less than that of a common silicon PN junction, the Schottky diode D4 is conducted, the Schottky diode has a shunting effect on the base current of the triode Q1, so that the voltage on the collector junction of the triode Q1 is always clamped on the conduction voltage drop of the Schottky diode D4, the triode Q1 is prevented from entering a deep saturation state when being conducted, the storage time of the triode Q1 is reduced, the switching speed of the triode Q1 is improved, the collector of the triode Q1 is connected with the photoelectric coupler to form a simple switching circuit, when a wireless communication signal does not enter an amplifying and voltage stabilizing circuit, the triode Q1 is in a cut-off state, no current passes through the U2 light emitting diode of the photoelectric coupler, the resistance at two ends of the collector and the emitter of the photosensitive triode of the photoelectric coupler U2 is very large and is equivalent to the fact that the switch is turned off, when a wireless communication signal is input to the amplifying and voltage stabilizing circuit, the triode Q1 is conducted, a light emitting diode of the photoelectric coupler U2 emits light, the resistance between a collector and an emitter of the photoelectric triode becomes very small, namely, the switch is turned on, in the process, the electric-optical-electric conversion of the wireless communication signal is also realized, signals with other frequencies except the wireless communication signal are further isolated, the anti-jamming capability of the wireless communication signal is improved, then the photoelectric coupler U2 with the triode Q2 as a core is used for improving the switching speed of the photoelectric coupler U2 by utilizing the photosensitive base positive feedback of the photoelectric coupler U2, the resistor R15 is a base bias resistor of the triode Q2 and provides proper working current for the triode Q2, the resistor R16 is a stable static working point of the triode Q2, so that the stable working state can be kept, the reaction time of the photoelectric coupler U3 is ensured by utilizing the parallel connection effect of the resistor R13 and the capacitor C8, in order to enable the wireless communication signal to work in a stable voltage range all the time, a voltage stabilizing circuit which is composed of a controllable precise voltage stabilizing source U3 and a triode Q3 as cores is utilized, a resistor R17 is used for providing proper base current for the triode Q3, the static output voltage value of the voltage stabilizing circuit, namely the working voltage of the circuit, is determined by a resistor R18 and a resistor R19, finally the wireless communication signal is coupled to the emitting end of an antenna through a capacitor C9, the voltage stabilizing circuit comprises a resistor R8, one end of the resistor R8 is connected with a network reference numeral 2, the other end of the resistor R8 is respectively connected with one end of a resistor R9 and one end of a resistor R10 and is connected with a positive polarity power supply VCC, the other end of the resistor R10 is connected with the anode of a light emitting diode of a photoelectric coupler U2, the other end of the capacitor C7 is respectively connected with the other end of a resistor R9, the anode of a base diode D4, the base of a, the negative electrode of the diode D3 is connected with one end of a resistor R11, the collector of the triode Q1 is respectively connected with the negative electrode of the light emitting diode of a photocoupler U2 and the negative electrode of the Schottky diode D4, the emitter of the triode Q1 is connected with one end of a resistor R12, the other end of the resistor R12 is respectively connected with the other end of a resistor R11 and the other end of a network label 3 and is grounded, the emitter of the phototriode of the photocoupler U2 is grounded, the base of the phototriode of the photocoupler U2 is respectively connected with one end of a resistor R13 and one end of a capacitor C8, one end of the resistor R16 is connected with a signal ground port, the other end of the resistor R13 is respectively connected with one end of a resistor R14 and the other end of a capacitor C8, the other end of the resistor R14 is grounded, the collector of the phototriode of the photocoupler U2 is respectively connected with one end of a resistor R, The collector of a triode Q2, the emitter of a triode Q2 are respectively connected with the other end of a resistor R16, one end of a resistor R17, the collector of a triode Q3 and the other end of a resistor R17 are respectively connected with the base of a triode Q3 and a pin 3 of a controllable precision voltage-stabilizing source U3, a pin 2 of a controllable precision voltage-stabilizing source U3 is respectively connected with one end of a resistor R18 and one end of a capacitor C9 and is connected with the ground in parallel, a pin 1 of a controllable precision voltage-stabilizing source U3 is respectively connected with the other end of a resistor R18 and one end of a resistor R19, and the emitter of a triode Q3 is respectively connected with the other end of a resistor R19 and the other end of a capacitor.

When the utility model is used, the wireless communication signal input firstly filters the interference signal except the wireless communication signal of 500 plus 940MHz through the band-pass filter circuit composed of the resistor R1, the capacitor C1, the capacitor C2 and the resistor R2, then the full-pass filter composed of the resistor R3 and the capacitor C3 is used as a phase correction network to ensure that the interference signal can not interfere the wireless communication signal, the diode D1 and the diode D2 are reversely connected in parallel to form an overvoltage protection circuit for the operational amplifier U1B, then the wireless communication signal enters the impedance matching circuit with the cooperative effect of the inductor L1, the variable capacitor C4 and the variable capacitor C5, the original end resistance value can be flexibly adjusted by changing the capacity ratio of the variable capacitor C4 and the variable capacitor C5, further, the original end resistance value is matched with the load end resistance value, the capacitor C6 is used as a compensation capacitor and the effect of the series inductor L2 is used as a resonance point for opening harmonics, the wireless communication signal passing through the impedance matching circuit is coupled into an amplifying circuit taking the triode Q1 as a core by utilizing a capacitor C7 to be amplified, a resistor R9 is a base bias resistor of the triode Q1 and is used for providing current for the triode Q1, so that the triode Q1 always works in a class A distortion-free amplifying state to achieve the best amplifying effect, a diode D3, a resistor R11 and a resistor R12 are static working points for stabilizing the triode Q1 and are not influenced by temperature change, the switching time of the triode Q1 is prolonged by utilizing a Schottky diode D4, and when the photoelectric coupler U2 and the triode Q2 cooperate to enable the triode Q2 to amplify the wireless communication signal, the photoelectric coupler U2 also realizes the electric-optical-electric conversion of the wireless communication signals, further isolates other signals except the wireless communication signals, improves the anti-interference capability of the wireless communication signals, then, the photoelectric coupler U2 photosensitive base positive feedback with the triode Q2 as the core is utilized to improve the switching speed of the photoelectric coupler U2, the switching time of the circuit is further shortened, and then the circuit enters a voltage stabilizing circuit which is composed of a controllable precise voltage stabilizing tube U3 and the triode Q3 as the core, the voltage stabilizing circuit is used for ensuring that the circuit always works in a stable voltage range, the resistor R17 is used for providing proper base current for the triode Q3, the resistor R18 and the resistor R19 determine the static output voltage of the voltage regulator circuit, i.e., the operating voltage of the circuit, and finally the wireless communication signal is coupled to the antenna transmitting terminal via the capacitor C9 for transmission.

Claims

1. The portable wireless communication anti-jamming device comprises a mainboard and an antenna, wherein the antenna receives a wireless communication signal input generated by the mainboard, and transmits the wireless communication signal to the outside through an antenna transmitting end, and is characterized in that the antenna further transmits the wireless communication signal to the antenna transmitting end after sequentially passing through a band-pass filter circuit, an impedance matching circuit and an amplifying and voltage stabilizing circuit, the band-pass filter circuit filters out interference signals except the wireless communication signal of 500-plus 940MHz received by the antenna, the interference signals pass through the impedance matching circuit to achieve the purpose of inhibiting reflection interference generated in the transmission process of the wireless communication signal, then the amplifying and voltage stabilizing circuit amplifies the wireless communication signal by using a triode Q1, the switching speed of the triode Q1 and a photoelectric coupler U2 is improved, the stability of a holding circuit is improved, and finally the wireless communication signal is transmitted to the antenna transmitting end, the purposes of improving the anti-interference capability of wireless communication signals and increasing the switching speed of a circuit are achieved.

2. The portable wireless communication anti-jamming device according to claim 1, wherein the band-pass filter circuit includes a resistor R1, one end of a resistor R1 is connected to the wireless communication signal input, the other end of a resistor R1 is connected to one end of a capacitor C1 and one end of a capacitor C2, the other end of a capacitor C1 is connected to ground, the other end of a capacitor C2 is connected to one end of a resistor R2, one end of a resistor R3 and one end of a capacitor C3, one end of a resistor R2 is connected to ground, the other end of a resistor R3 is connected to one end of a resistor R4, the inverting input end of an operational amplifier U1B, the negative electrode of a diode D1 and the positive electrode of a diode D2, the other end of a capacitor C9 is connected to the non-inverting input end of an operational amplifier U1B, the positive electrode of a diode D1, the negative electrode of a diode D2, one end of a resistor R5, one end of a resistor R6, the other end of a resistor R5 is connected to ground, and, The other end of the resistor R6 is connected to network label 1, and two power supply pins of the operational amplifier U1B are respectively connected to the positive power supply VCC and the ground.

3. The portable wireless communication anti-jamming device of claim 1, wherein the impedance matching circuit includes a resistor R7, one end of the resistor R7 is connected to the network label 1, the other end of the resistor R7 is connected to one end of an inductor L1 and one end of a variable capacitor C4, the other end of the inductor L1 is connected to one end of a variable capacitor C5 and one end of a capacitor C6, the network label 2, the other end of the capacitor C6 is connected to one end of an inductor L2, and the other end of the variable capacitor C4 is connected to the other end of the variable capacitor C5, the other end of the inductor L2, and connected to ground and the network label 3.

4. The portable wireless communication anti-jamming device according to claim 1, wherein the amplifying and voltage stabilizing circuit includes a resistor R8, one end of the resistor R8 is connected to the network reference number 2, the other end of the resistor R8 is connected to one end of a resistor R9 and one end of a resistor R10 respectively and is connected to the positive power source VCC, the other end of the resistor R10 is connected to the anode of the light emitting diode of the photocoupler U2, the other end of the capacitor C7 is connected to the other end of the resistor R9, the anode of the schottky diode D4, the base of the transistor Q1, the anode of the diode D3, the cathode of the diode D3 is connected to one end of a resistor R11, the collector of the transistor Q1 is connected to the cathode of the light emitting diode of the photocoupler U2 and the cathode of the schottky diode D4, the emitter of the transistor Q1 is connected to one end of the resistor R12, the other end of the resistor R12 is connected to the other, The network label 3 is connected in parallel and grounded, the emitter of the phototriode of the photocoupler U2 is connected with ground, the base of the phototriode of the photocoupler U2 is respectively connected with one end of a resistor R13 and one end of a capacitor C8, one end of a resistor R16 is connected with a signal ground port, the other end of the resistor R13 is respectively connected with one end of a resistor R14 and the other end of a capacitor C8, the other end of a resistor R14 is connected with ground, the collector of the phototriode of the photocoupler U2 is respectively connected with one end of a resistor R15 and the base of a triode Q2, the other end of a resistor R15 is respectively connected with a positive power supply VCC and the collector of a triode Q2, the emitter of the triode Q2 is respectively connected with the other end of a resistor R16, one end of a resistor R17, the collector of a triode Q3 and the other end of a resistor R17 are respectively connected with the base of a triode Q3 and a pin 3 of a controllable precision, One end of a capacitor C9 is connected in parallel to the ground, a pin 1 of a controllable precision voltage-stabilizing source U3 is respectively connected with the other end of a resistor R18 and one end of a resistor R19, and an emitting electrode of a triode Q3 is respectively connected with the other end of a resistor R19 and the other end of a capacitor C9 and is connected with an antenna emitting end.