CN115001622A

CN115001622A - Radio frequency isolation system and isolation method

Info

Publication number: CN115001622A
Application number: CN202210927541.3A
Authority: CN
Inventors: 张北江; 赵陆文
Original assignee: Nanjing Younitai Information Technology Co ltd
Current assignee: Nanjing Younitai Information Technology Co ltd
Priority date: 2022-08-03
Filing date: 2022-08-03
Publication date: 2022-09-02
Anticipated expiration: 2042-08-03
Also published as: CN115001622B

Abstract

The invention discloses a radio frequency isolation system and an isolation method, wherein the radio frequency isolation system comprises an isolation device, the isolation device comprises an isolation component and a deception detection unit, the isolation component comprises a first connection port and a second connection port which are respectively used for connecting a terminal device and an active antenna; a radio frequency channel and a power supply channel which are connected in parallel are arranged between the first connecting port and the second connecting port; the power supply channel is provided with a controllable switch, the control end of the controllable switch is electrically connected with the deception detection unit, and the deception detection unit controls the on-off of the controllable switch so as to block the radio frequency signal of the radio frequency channel. The radio frequency signal isolation device has a good radio frequency signal isolation effect, is convenient to install an existing system, and is low in implementation cost and convenient to use.

Description

Radio frequency isolation system and isolation method

Technical Field

The invention belongs to the field of communication and navigation, and particularly relates to a radio frequency isolation system and an isolation method.

Background

At present, wireless communication and navigation terminal devices receive radio frequency signals through antennas, and if interference or deception protection capabilities do not exist, when the received radio frequency signals are interference signals and deception signals, deviation or errors occur in information received and output by the terminal devices, such as time information, position information and the like.

In the prior art, in order to detect and isolate a radio frequency signal received by an antenna when the radio frequency signal is an interference signal or a spoofing signal, the received radio frequency signal is usually detected, and when the radio frequency signal is found to be the interference signal or the spoofing signal, a radio frequency switch connected between the antenna and a terminal device is controlled to prevent the antenna from transmitting the radio frequency signal to a terminal device, and when no interference signal or spoofing signal is detected, normal transmission can be recovered.

However, the rf switch cannot achieve complete rf signal isolation, but achieves isolation by signal attenuation, but high-isolation signal attenuation control (typically, attenuation 110 dB) is difficult to achieve, so that the rf switch cannot be completely turned off, and the terminal device can still receive the rf signal and output error information.

Disclosure of Invention

The invention mainly solves the technical problems that a radio frequency isolation system and an isolation method are provided, and the problems that radio frequency signals cannot be completely isolated, upgrading and upgrading of existing equipment are inconvenient and inconvenient, cost is high and the like in the prior art are solved.

In order to solve the technical problem, the technical scheme adopted by the invention is to provide a radio frequency isolation system, which comprises an isolation device, wherein the isolation device comprises an isolation component and a deception detection unit, and the isolation component comprises a first connection port and a second connection port which are respectively used for connecting a terminal device and an active antenna;

a radio frequency channel and a power supply channel which are connected in parallel are arranged between the first connecting port and the second connecting port, the radio frequency channel is used for transmitting radio frequency signals, and the power supply channel is used for supplying power to and transmitting power to the active antenna;

the power supply channel is provided with a controllable switch, the controllable switch is used for controlling the power supply channel to be switched on or switched off, the control end of the controllable switch is electrically connected with the deception detection unit, and the deception detection unit is used for controlling the controllable switch to be switched on or switched off.

Preferably, the fraud detection unit detects a fraud signal or an interference signal and controls the controllable switch to be switched off; and the cheating detection unit does not work, and the controllable switch is controlled to be switched on when a cheating signal or a jamming signal is not detected.

Preferably, the spoof detecting unit performs spoof signal or interference signal detection by separately receiving the same signal as the radio frequency signal.

Preferably, the spoofing detecting unit is electrically connected to a second antenna, and performs spoofing signal or interference signal detection by receiving a radio frequency signal from the second antenna.

Preferably, the isolating device comprises a plurality of isolating assemblies with the same structure, and the fraud detection unit comprises a plurality of control output lines which are respectively electrically connected with the controllable switches corresponding to the plurality of isolating assemblies and are controlled to be switched on or switched off.

Preferably, the second antenna includes an isolation component for integrally receiving radio frequency signals of multiple frequency bands and different systems, and the spoofing detection unit correspondingly and respectively controls the isolation component on the transmission feeder line of the different radio frequency signals.

Preferably, a dc blocking capacitor, a high pass filter or a band pass filter is connected in series to the radio frequency channel.

Preferably, the power supply channel includes a first control port and a second control port, a first inductor is connected between the first control port and the first connection port, a second inductor is connected between the second control port and the second connection port, and the first control port and the second control port are respectively electrically connected to two connection ends of the controllable switch.

The invention also provides a radio frequency isolation method, which comprises the following steps:

the terminal equipment is connected with the active antenna through a cable, and the cable is used for transmitting radio frequency signals and supplying power to the active antenna for transmission;

the cable is connected with an isolating device in series, a controllable switch is arranged in the isolating device, and after the controllable switch cuts off power supply transmission to the active antenna, the radio-frequency signal is interrupted in transmission; and after the controllable switch is connected to the active antenna for power supply transmission, the radio-frequency signal is recovered for transmission.

Preferably, a fraud detection unit is further arranged in the isolation device, and the fraud detection unit is used for conducting on-off control on the controllable switch.

The invention has the beneficial effects that: the invention provides a radio frequency isolation system and a method, wherein the system comprises an isolation device, an isolation component and a deception detection unit, wherein the isolation component comprises a first connection port and a second connection port which are respectively used for connecting a terminal device and an active antenna; a radio frequency channel and a power supply channel which are connected in parallel are arranged between the first connecting port and the second connecting port; the power supply channel is provided with a controllable switch, the control end of the controllable switch is electrically connected with the deception detection unit, and the deception detection unit controls the on-off of the controllable switch so as to block the radio frequency signal of the radio frequency channel. The radio frequency signal isolation device has a good radio frequency signal isolation effect, is convenient to install an existing system, and is low in implementation cost and convenient to use.

Drawings

FIG. 1 is a schematic diagram of the components of an embodiment of the RF isolation system of the present invention;

FIG. 2 is a schematic diagram of another embodiment of the RF isolation system of the present invention;

FIG. 3 is a schematic diagram of another embodiment of the RF isolation system of the present invention;

FIG. 4 is a schematic circuit diagram of an embodiment of an isolation component in the RF isolation system of the present invention;

FIG. 5 is a schematic diagram of a circuit board of an embodiment of an isolation assembly in an RF isolation system according to the present invention;

FIG. 6 is a schematic diagram of a front view of a housing of an embodiment of an isolation assembly in the RF isolation system of the present invention;

FIG. 7 is a schematic diagram of another embodiment of the RF isolation system of the present invention;

fig. 8 is a flow chart of an embodiment of the radio frequency isolation method of the present invention.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The invention provides an embodiment of a radio frequency isolation system, as shown in fig. 1, the radio frequency isolation system includes an isolation apparatus A3, the isolation apparatus A3 includes an isolation component a31 and a spoofing detection unit a32, the isolation component a31 includes a first connection port a314 and a second connection port a313, which are respectively used for connecting a terminal device a2 and an active antenna a 1;

in the isolation component a31, a radio frequency channel a311 and a power supply channel a312 are arranged in parallel between the first connection port a314 and the second connection port a313, where the radio frequency channel a311 is used for transmitting radio frequency signals, and the power supply channel a312 is used for supplying power to the active antenna a 1.

A controllable switch a316 is provided on the power supply channel a312 for controlling the power supply channel a312 to be turned on or off, a control terminal of the controllable switch a316 is electrically connected to the fraud detection unit a32, and the fraud detection unit a32 controls the controllable switch a316 to be turned on or off. In a specific implementation, the controllable switch a316 may be disposed inside the isolation assembly a31 (as shown in fig. 1), or outside the isolation assembly a31, and may be a separate switch interposed between the isolation assembly a31 and the fraud detection unit a 32.

In the embodiment shown in fig. 1, the spoofing detecting unit a32 is mainly used for detecting a received radio frequency signal and detecting whether a spoofing signal or an interfering signal exists, which is applied to receiving satellite positioning navigation signals, mobile communication base station signals and the like, and is mainly used for detecting that a malicious artificial spoofing or interfering signal is found. In fig. 1, the first connection port a314 and the second connection port a313 are reversible, although fig. 1 shows the first connection port a314 connected to the terminal a2 by a feeder a4 and the second connection port a313 connected to the active antenna a1 by another feeder a4, which is also fully possible when instead the first connection port a314 is connected to the active antenna a1 by a feeder a4 and the second connection port a313 is connected to the terminal a2 by another feeder a 4.

Further, the feeder a4 is a coaxial cable for transmitting rf signals and dc power transmission, so that before the isolator A3 is connected to the feeder a4 in series, a single feeder a4 can be used to connect the terminal a2 to the active antenna a1, thereby ensuring the normal operation of the active antenna a1 and the terminal a 2. When the isolating device A3 is added, only one feeder line A4 needs to be changed into two feeder lines, the isolating device A3 is connected in series in the middle, the isolating device A3 can be arranged close to the terminal equipment A2 or the active antenna A1, and the installation of the isolating device A3 is not influenced by position arrangement, so that the isolating device A3 is very convenient and quick to install in an existing system and is not limited by places and equipment.

After the isolation device A3 is used to cut off the power supply to the active antenna a1, the active antenna a1 will stop working due to the power cut, so that the isolation device A3 and the terminal device a2 will not be output with radio frequency signals, and therefore the problem that the radio frequency signals in the prior art cannot be completely isolated on the transmission channel can be well solved.

In fig. 1, specific implementations of the first connection port a314, the second connection port a313, the radio frequency channel a311, and the power supply channel a312 are specifically described later.

Preferably, the fraud detection unit a32 in fig. 1 detects a fraud signal or a jamming signal and controls the controllable switch a316 to open; the fraud detection unit a32 is not active and no fraud or interference signal is detected, controlling the controllable switch a316 to be switched on. Therefore, normally, the controllable switch a316 is set to be normally closed, or defaulted to be normally closed, and the controllable switch a316 is controlled to be opened only when the existence of the interference signal or the spoofing signal is detected. Thus, even if the fraud detection unit a32 is not powered on, it is ensured that the isolator A3 can preferentially ensure normal power supply operation.

Preferably, the spoof detecting unit a32 performs spoof or jamming signal detection by separately receiving the same signal as the radio frequency signal. Here, it is usually enough to use another antenna to receive the same rf signal, that is, the rf signal belongs to the same band and type as the rf signal received by the active antenna, and it is not required that the another antenna and the active antenna are of the same type.

In this way, after the interference signal or the spoofing signal is detected, the isolation device A3 can further detect the received radio frequency signal after the active antenna a1 is powered off, and when the interference signal or the spoofing signal disappears, the isolation device A3 can be controlled to restore the power supply to the active antenna a 1.

Preferably, on the basis of fig. 1, fig. 2 shows that the fraud detection unit a32 is electrically connected to the second antenna a12, and performs fraud signal or interference signal detection by receiving a radio frequency signal from the second antenna a 12. The rf signal of the second antenna a12 is the same as the rf signal received by the active antenna, or the rf signal of the second antenna a12 includes the rf signal received by the active antenna.

With the embodiment shown in fig. 2, interference or spoofing detection on radio frequency signals can be achieved by separately providing the isolation device A3 and the second antenna a12, and then turning off or on the isolation device A3, so that there is no influence on the original active antenna a1 and the terminal device a2, and convenience of adding the isolation system between the original active antenna a1 and the terminal device a2 is enhanced. Also, the second antenna a12 may be the same antenna as the active antenna a1, or may be an antenna dedicated to detecting jamming signals or spoofing signals, such as spoofing signals corresponding to GPS or beidou satellite navigation signals, and mobile communication spoofing signals corresponding to mobile communication base stations. The second antenna a12 has better receiving detection performance, or is more suitable for detecting by the deception detection unit a32, so that an independent system which is different from the original active antenna a1 and the original terminal device a2 in structure can be completely realized, the design and development independence of the isolation system is enhanced, and the isolation system is suitable for various application scenarios.

Further, fig. 3 shows a further improvement over the embodiment shown in fig. 2. It can be seen that the isolating device A3 herein may include a plurality of isolating assemblies a31 having the same structure, and the fraud detection unit a32 includes a plurality of control output lines electrically connected to the controllable switches respectively corresponding to the plurality of isolating assemblies a31 and performing on/off control. The power supply channel connection or disconnection control can be respectively carried out on a plurality of isolation assemblies A31 by using one deception detection unit A32, and further, the radio frequency isolation control can be carried out on a plurality of active antennas A1 and terminal equipment A2. Therefore, the method has the advantage of intensification. The specific control method is as before, and is not described herein again.

Preferably, in fig. 3, the second antenna a12 is an integrated antenna, and includes multiple frequency bands and multiple types of antennas, for example, the second antenna may include satellite navigation signals of different frequency bands and systems, such as satellite navigation signals of the beidou system, the GPS system, the GLONASS system, and the like, and may also include mobile communication signals of various systems.

Preferably, the second antenna a12 includes an isolation component a31 that is integrated to receive radio frequency signals of multiple frequency bands and different systems, and the deception detection unit a32 controls the feeder lines for transmitting different radio frequency signals according to the detection result. The fraud detection unit a32 correspondingly controls the isolation device A3 to isolate the corresponding feeder line according to whether the received signals have interference signals or fraud signals, so that the number of the isolation devices A3 in fig. 3 is not limited to two, and may be multiple, and the connection line on which each isolation device is located may also be different in the frequency band and signal system of the radio frequency signals of the corresponding terminal device and active antenna. Thus, the application range of the invention is greatly enhanced.

Further, the present invention provides an isolation component a31, as shown in fig. 4, fig. 4 is a schematic circuit structure diagram of an embodiment of the isolation component of the present invention, and the isolation component a31 includes a first connection port a314 and a second connection port a313, which are respectively used for connecting the active antenna a1 and the terminal device a2, and have interchangeability, that is, the first connection port a314 is connected to the active antenna a1, the second connection port a313 is connected to the terminal device a2, or the first connection port a314 is connected to the terminal device a2, and the second connection port a313 is connected to the active antenna a 1.

Preferably, the two connection ports are of the type including coaxial connection ports, such as BNC interface, SMA interface, N-type interface, etc., i.e. port patch sockets connectable to coaxial radio frequency cables.

Preferably, the two connection ports can both transmit radio frequency signals and transmit power, and correspondingly, a radio frequency channel a311 and a power supply channel a312 which are connected in parallel are arranged between the first connection port a314 and the second connection port a 313. The radio frequency channel A311 is used for transmitting radio frequency signals inside the isolation component, and the power supply channel A312 is used for power supply transmission.

Preferably, a dc blocking capacitor C1 is connected in series to the rf path a311, the dc blocking capacitor C1 couples and transmits the rf signal of the rf path a311, and isolates and interrupts power transmission, where the power supply mainly refers to dc power supply, and therefore the dc power supply from the first connection port a314 or the second connection port a313 is blocked on the rf path a 311. Therefore, the rf channel a311 here is only for transmitting rf signals.

Preferably, a high-pass filter or a band-pass filter (not shown) is connected in series to the rf channel a311, and the high-pass filter or the band-pass filter may also block the dc power supply signal and simultaneously pass the rf signal of the corresponding frequency band through the high-pass filter or the band-pass filter. Thus, the high-pass filter or the band-pass filter adapts the frequency band range of the radio-frequency signal transmitted by the radio-frequency pass.

Preferably, the power supply channel a312 includes a first control port J1 and a second control port J2, a first inductor L1 is connected between the first control port J1 and the first connection port a314, a second inductor L2 is connected between the second control port J2 and the second connection port a313, the first inductor L1 and the second inductor L2 are used for blocking a radio frequency signal from entering the power supply channel a312, so as to avoid the radio frequency signal from interfering with the power supply channel a312, and the first control port J1 and the second control port J2 are used for connecting the controllable switch a316, so as to control the power supply channel a312 to be switched on or off.

Preferably, the first control port J1 and the second control port J2 are also interchangeable, with no difference in positive or negative polarity. The first control port J1 and the second control port J2 may be in the form of a socket for connecting electrical leads having a metallic conductive core coated with an insulating layer, the electrical leads also being conventional electrical leads having metallic wires such as copper wires, aluminum wires, etc. coated with an insulating rubber.

Therefore, the first connection port a314 and the second connection port a313 can be connected with the terminal device a2 and the active antenna a1 respectively through feeders, and the feeders can simultaneously transmit radio frequency signals and power transmission, so that power supply and radio frequency signal transmission to the antenna can be realized by connecting the antennas through the ports and the feeders, and the radio frequency signal interface and the power interface in the prior art are not required to be respectively connected with cables to be electrically connected with the antennas. Thus, the ease of use of the embodiment of FIG. 4 is greatly enhanced and is not limited by the placement of the isolation device adjacent to the antenna.

Fig. 4 further includes a first capacitor C2 and a second capacitor C3, an electrical connection between the first inductor L1 and the first control port J1 is further electrically connected to one end of the first capacitor C2, the other end of the first capacitor C2 is grounded, an electrical connection between the second inductor L2 and the second control port J2 is further electrically connected to one end of the second capacitor C3, and the other end of the second capacitor C3 is grounded.

Further, the power channel a312 may be turned on or off through the controllable switch a316, when the power channel a is turned on, the power channel a312 may directly supply power to the active antenna a1, the active antenna a1 is normally turned on to operate, and the isolation component a31 outputs the radio frequency signal to the terminal device a2, when the controllable switch a316 is turned off, the power channel a312 stops supplying power to the active antenna a1, and the active antenna a1 cannot output the radio frequency signal any more, so that the radio frequency channel a311 does not transmit the radio frequency signal from the active antenna a 1. Therefore, the problem that the radio frequency switch in the prior art cannot completely isolate the interrupted radio frequency signal does not occur in the embodiment. Because the controllable switch a316 is turned off, the power channel a312 does not form a power path, and the power supply to the active antenna a1 is cut off, which is equal to cutting off the source of the rf signal, the rf channel a311 does not have the rf signal from the active antenna a1, which is a completely different design concept from the prior art.

Preferably, as shown in fig. 5, fig. 5 is a schematic circuit structure diagram of a circuit board according to an embodiment of the isolation assembly, the radio frequency channel includes a first microstrip line 101 and a second microstrip line 102, the first microstrip line 101 and the second microstrip line 102 can provide direct current and transmit radio frequency signals, one end of the first microstrip line 101 is electrically connected to the first connection port a314, specifically, may be electrically connected to the first core a3141 of the first connection port a314, the other end of the first microstrip line 101 is electrically connected to one end of the dc blocking capacitor C1, one end of the second microstrip line 102 is electrically connected to the second connection port a313, specifically, may be electrically connected to the second core a3131 of the second connection port a313, and the other end of the second microstrip line 102 is electrically connected to the other end of the dc blocking capacitor C1.

One end of the first inductor L1 is electrically connected to the first microstrip line 101, and the other end of the first inductor L1 is electrically connected to the first control port J1; one end of the second inductor L2 is electrically connected to the second microstrip line 102, and the other end of the second inductor L2 is electrically connected to the second control port J2.

The electric connection part of the first inductor L1 and the first control port J1 is further electrically connected with one end of a first capacitor C2, the other end of the first capacitor C2 is grounded, the first inductor L1 and the first capacitor C2 form a first feed path, the electric connection part of the second inductor L2 and the second control port J2 is further electrically connected with one end of a second capacitor C3, the other end of the second capacitor C3 is grounded, and the second inductor L2 and the second capacitor C3 form a second feed path.

Preferably, the radio frequency channel can also replace a blocking capacitor through a high-pass filter or a band-pass filter in a specific implementation form, and the filters can not only block direct current power supply, but also can more accurately filter the frequency band of the radio frequency signal, so that the radio frequency signal outside the frequency band of the radio frequency signal can not pass through the radio frequency channel.

Therefore, in an implementation form, the radio frequency channel may include a first microstrip line 101 and a second microstrip line 102, the first microstrip line 101 and the second microstrip line 102 may supply direct current and transmit radio frequency signals, one end of the first microstrip line 101 is electrically connected to the first connection port a314, the other end of the first microstrip line 101 is electrically connected to one filtering input and output end of a high-pass filter or a band-pass filter, one end of the second microstrip line 102 is electrically connected to the second connection port a313, and the other end of the second microstrip line 102 is electrically connected to the other filtering input and output end of the high-pass filter or the band-pass filter.

The high-pass filter and the band-pass filter may be passive filters formed by electrically connecting separate electronic components such as capacitors and resistors, or may be passive integrated circuit filters. The filter input and output ends of the filters have reversibility, that is, the filters comprise two input and output ends which can be used as input ends or output ends of radio-frequency signals in a reciprocal manner.

In the present embodiment, as shown in fig. 7, the first connection port a314 of the isolation assembly a31 is used for connecting the terminal device a2, and the second connection port a313 is used for connecting the active antenna a 1; or the first connection port a314 of the isolation component a31 is used to connect the active antenna a1 and the second connection port a313 is used to connect the terminal device a 2. When the first connection port a314 of the isolation component a31 is used for connecting the terminal device a2, the second connection port a313 is used for connecting the active antenna a1, and after the terminal device a2 is powered on, the terminal device a2 feeds in direct current through the first connection port a314, and the direct current supplies direct current to the active antenna a1 through the second connection port a313 after passing through the first microstrip line, the first feeding path, the first control port J1, the controllable switch a316 (under a closed condition), the second control port J2, the second feeding path, and the second microstrip line.

In this embodiment, a controllable switch a316 is connected in series between a first control port J1 and a second control port J2 of an isolation component a31, and in a normal operating state, the controllable switch a316 is turned on, a terminal device a2 feeds power to an active antenna a1, and the active antenna a1 can transmit a radio frequency signal to a terminal device a2 through a radio frequency channel a 311; when detecting that the radio frequency signal is an interference signal, controlling the controllable switch a316 to be switched off, the terminal device a2 cannot feed to the active antenna a1, and the active antenna a1 cannot output the radio frequency signal any more, so that the radio frequency channel does not transmit the radio frequency signal from the antenna, the terminal device a2 cannot receive the radio frequency signal and cannot receive the interference signal, and when detecting that the interference signal disappears, controlling the controllable switch a316 to be switched on, the power supply channel restores to the path, and the terminal device a2 normally feeds to the active antenna a 1. The controllable switch A316 can be externally connected to the isolation component A31, when an interference signal is detected, the controllable switch A316 can be accurately disconnected, the deception that terminal equipment is subjected to the interference signal is avoided, and wrong information is output.

Preferably, as shown in fig. 5, the first microstrip line 101 and the second microstrip line 102, as well as the dc blocking capacitor C1, the first inductor L1, the second inductor L2, the first capacitor C2 and the second capacitor C3 are all disposed on the circuit board, and the first microstrip line 101 and the second microstrip line 102 are copper-clad wires on the circuit board and are directly implemented by printed copper wires on the circuit board, so that the circuit structure is more compact and the space is saved.

Preferably, the isolation assembly a31 further includes a housing 103, as shown in fig. 6, fig. 6 is a schematic view of a front view structure of the isolation assembly, the circuit board is fixed on an opening surface of the housing 103, the first inner core a3141 of the first connection port a314 and the second inner core a3131 of the second connection port a313 are respectively welded on the first microstrip line 101 and the second microstrip line 102 of the circuit board, and both the first connection port a314 and the second connection port a313 are convexly disposed on a surface of the housing 103; the first control port and the second control port are respectively arranged on opposite surfaces (not shown in fig. 6) of the first connection port a314 and the second connection port a313, and are insulated to penetrate through the side surface of the shell 103, the third inner core of the first control port and the fourth inner core of the second control port are respectively connected with the first inductor and the second inductor on the circuit board, for example, electrically connected through wires, and the first control port and the second control port are both convexly arranged on the surface of the shell 103. The circuit board is packaged on the shell 103, the first connection port A314 and the second connection port A313 are arranged on one side of the shell 103, the first control port and the second control port are arranged on the other side of the shell 103, the space layout of components is compact, the two sides of the circuit board are reasonably utilized, the use area of the circuit board is reduced, and the cost is saved.

Preferably, on the circuit board, the dc blocking capacitor C1 is disposed between the first microstrip line 101 and the second microstrip line 102, as shown in fig. 4, the first connection port a314 and the second connection port a313, the first microstrip line 101 and the second microstrip line 102, the first inductor L1 and the second inductor L2, and the first capacitor C2 and the second capacitor C3 are all disposed symmetrically with respect to the dc blocking capacitor C1. The components and parts symmetry sets up, and components and parts are rationally distributed and pleasing to the eye, need not to use extra cable to weld.

Preferably, in another embodiment of the present invention, the rf channel a311 includes a first coaxial line (instead of the first microstrip line before replacement) and a second coaxial line (instead of the second microstrip line before replacement) (not shown in the figure), each of the first coaxial line and the second coaxial line includes an inner core, a fifth inner core of the first coaxial line and a sixth inner core of the second coaxial line can both transmit rf signals and transmit power, the first connection port a314 and the second connection port a313 are coaxial interfaces, the two ports are respectively used for connecting the active antenna a1 and the terminal a2, and the ports are interchangeable, that is, the first connection port a314 is connected to the active antenna a1, the second connection port a313 is connected to the terminal, or the first connection port a314 is connected to the terminal a2, and the second connection port a313 is connected to the active antenna a 1. One end of the fifth inner core of the first coaxial line is electrically connected with the first inner core of the first connection port a314, the other end of the fifth inner core of the first coaxial line is electrically connected with one end of the dc blocking capacitor C1, one end of the sixth inner core of the second coaxial line is electrically connected with the second inner core of the second connection port a313, and the other end of the sixth inner core of the second coaxial line is electrically connected with the other end of the dc blocking capacitor C1. The dc blocking capacitor C1 couples the rf signal of the rf path a311 and isolates the power transmission, so that the dc power from the first connection port a314 or the second connection port a313 is blocked on the rf path a 311. In this embodiment, the first coaxial line, the second coaxial line, and the dc blocking capacitor C1 are welded together to form the rf path a311, which is simple and fast in manufacturing process and can be used temporarily. In addition, the blocking capacitor can be replaced by a high-pass filter or a band-pass filter.

As shown in fig. 4, the aforementioned isolation assembly a31 is disposed separately from the controllable switch a316 (the controllable switch may also be disposed inside the isolation assembly), that is, the controllable switch a316 is disposed outside the isolation assembly a31, the first control port J1 and the second control port J2 of the isolation assembly a31 are electrically connected to two connection terminals of the controllable switch a316, respectively, and the controllable switch a316 is used for controlling to turn on or off the first control port J1 and the second control port J2.

Preferably, in a normal state, the controllable switch a316 is in a normally closed state, the radio frequency channel a311 and the power supply channel a312 are switched on, when the fraud detection unit detects an interference signal, the controllable switch a316 is controlled to be switched off, the radio frequency channel a311 and the power supply channel a312 are switched off, the isolation device cannot feed power to the active antenna a1, the active antenna a1 stops transmitting the radio frequency signal, and the terminal device is prevented from receiving the interference signal.

Here, since the controllable switch a316 is in the normally closed state, when the switch fails to control, the switch-off control cannot be performed, and since the switch is in the default normally closed state, the normal transmission of the radio frequency signal is not affected. Therefore, even if the controllable switch A316 fails to control, the normal operation can be ensured to be continuously carried out, and the turn-off control can not be carried out only when the interference occurs.

As shown in fig. 7, the radio frequency isolation system includes the aforementioned isolation device A3, and further includes an active antenna a1 and a terminal equipment a2, in this embodiment, the first connection port a314 of the isolation device A3 is connected to the terminal equipment a2 through a feeder line a4, and the second connection port a313 of the isolation device A3 is connected to the active antenna a1 through a feeder line a 4; the isolation device A3 is used for controlling transmission of radio frequency signals and power supply between the terminal device a2 and the active antenna a1, that is, when the controllable switch a316 of the isolation device A3 is in a normal state, the isolation device A3 supplies power to the active antenna a1, the active antenna a1 transmits radio frequency signals to the terminal device a2 through the radio frequency channel a311 of the isolation device A3, and the terminal device a2 can normally receive the radio frequency signals; when the isolating device A3 detects an interference signal, in order to prevent the terminal device a2 from receiving the interference information and further outputting wrong information, therefore, the isolating device A3 controls the controllable switch a316 to be turned off, the isolating device A3 stops supplying power to the active antenna a1, the active antenna a1 cannot output a radio frequency signal any more, so the terminal device a2 cannot receive the radio frequency signal, when the isolating device A3 detects that the interference signal disappears, the controllable switch a316 is controlled to be turned on, the power supply channel a312 restores the path, and the terminal device a2 normally supplies power to the active antenna a 1. In other embodiments of the present invention, the first connection port a314 of the isolation device A3 is connected to the active antenna a1 through feeder a4, and the second connection port a313 of the isolation device A3 is connected to the terminal equipment a2 through feeder a 4.

Preferably, based on the same concept, the present invention further provides a radio frequency isolation method, as shown in fig. 8, including:

step S1: the terminal equipment is connected with the active antenna through a cable, and the cable is used for transmitting radio frequency signals and supplying power to the active antenna for transmission;

step S2: the cable is connected with an isolating device in series, a controllable switch is arranged in the isolating device, and after the controllable switch cuts off power supply transmission to the active antenna, the radio frequency signal is interrupted for transmission; and after the controllable switch is connected to the active antenna for power supply transmission, the radio-frequency signal is recovered for transmission.

Preferably, a fraud detection unit is further provided in the isolation device, and the controllable switch is controlled to be turned on or off by the fraud detection unit.

Preferably, the deception detection unit detects a deception signal or an interference signal and controls the controllable switch to be switched off; and the deception detection unit does not work, and the controllable switch is controlled to be switched on when the deception signal or the interference signal is not detected.

Further, the radio frequency isolation method includes detecting a radio frequency signal received by the second antenna in the foregoing embodiments of fig. 2 and fig. 3, and further performing isolation control on the radio frequency feeder transmission line of the active antenna and other terminal devices. And, the isolation component adopted by the radio frequency isolation method is also based on the technical solutions of fig. 4 to fig. 6, which are not described herein again.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims

1. A radio frequency isolation system is characterized by comprising an isolation device, wherein the isolation device comprises an isolation component and a deception detection unit, the isolation component comprises a first connection port and a second connection port which are respectively used for connecting a terminal device and an active antenna;

a radio frequency channel and a power supply channel which are connected in parallel are arranged between the first connecting port and the second connecting port, the radio frequency channel is used for transmitting radio frequency signals, and the power supply channel is used for supplying power to the active antenna for transmission;

the power supply channel is provided with a controllable switch, the controllable switch is used for controlling the power supply channel to be switched on or switched off, the control end of the controllable switch is electrically connected with the deception detection unit, and the deception detection unit is used for switching on or switching off the controllable switch.

2. The radio frequency isolation system of claim 1, wherein the spoof detecting unit detects a spoof signal or a jamming signal and controls the controllable switch to open.

3. The radio frequency isolation system of claim 1, wherein the spoof detection unit performs spoof or jammer detection by separately receiving the same signal as the radio frequency signal.

4. The radio frequency isolation system of claim 1, wherein the spoof detecting unit is electrically connected to a second antenna, and wherein spoof or interference signal detection is performed by receiving a radio frequency signal from the second antenna.

5. The radio frequency isolation system according to claim 4, wherein the isolation device comprises a plurality of isolation assemblies with the same structure, and the fraud detection unit comprises a plurality of control output lines which are respectively electrically connected with the controllable switches corresponding to the plurality of isolation assemblies and are controlled to be switched on or switched off.

6. The radio frequency isolation system of claim 5, wherein the second antenna comprises an isolation component for integrally receiving radio frequency signals of a plurality of frequency bands and different systems, and the spoofing detection unit correspondingly controls the isolation component on transmission feeders of different radio frequency signals.

7. The radio frequency isolation system according to any one of claims 1 to 6, wherein a dc blocking capacitor, a high pass filter or a band pass filter is connected in series to the radio frequency channel.

8. The radio frequency isolation system according to any one of claims 1 to 6, wherein the power supply channel includes a first control port and a second control port, a first inductor is connected between the first control port and the first connection port, a second inductor is connected between the second control port and the second connection port, and the first control port and the second control port are respectively electrically connected to two connection ends of the controllable switch.

9. A radio frequency isolation method, comprising:

10. The radio frequency isolation method according to claim 9, wherein a fraud detection unit is further arranged in the isolation device, and the controllable switch is controlled to be switched on or off by the fraud detection unit.