Passive indoor distribution system

Abstract

The invention discloses a passive indoor distribution system which comprises an information source, a feeder line system, an antenna, an Internet of Things gateway, an Internet of Things-communication combiner, a feeder line-sensor coupler and a radio frequency energy Internet of Things sensor. Wherein the Internet of Things gateway and the information source are connected to the feeder line system through the Internet of Things-communication combiner, the feeder line-sensor coupler is inserted into a target feeder line of the feeder line system, and the radio frequency energy Internet of Things sensor is connected to the coupling end of the feeder line-sensor coupler; the Internet of Things gateway is used for generating an Internet of Things radio frequency signal through a built-in radio frequency module and inputting the Internet of Things radio frequency signal into the Internet of Things-communication combiner; the Internet of Things-communication combiner is used for combining the Internet of Things radio frequency signal with the communication radio frequency signal of the information source and inputting the combined radio frequency signal into the feeder system; the feeder-sensor coupler is used for coupling a part of radio frequency signals to the radio frequency energy internet of things sensor when the target feeder in the feeder system transmits the combined radio frequency signals; and the radio frequency energy Internet of Things sensor is used for converting radio frequency energy of the part of radio frequency signals into electric energy, driving a built-in Internet of Things sensor to acquire Internet of Things information, and transmitting the Internet of Things information back to the Internet of Things gateway through the feeder line system.

Description

Technical Field

[0001] The present application belongs to the technical field of Internet of Things, and specifically relates to a passive indoor distribution system and a radio frequency energy Internet of Things sensor. Background Art

[0002] Collecting IoT information such as smoke, temperature, and humidity in buildings can be widely used in many fields, such as smart fire protection and smart energy efficiency management. In related technologies, in order to collect IoT information in buildings, it is usually necessary to deploy an IoT system in the building. Deploying a new IoT system in a building has a high deployment cost. Summary of the invention

[0003] The present application provides a passive indoor distribution system, which uses the existing passive indoor distribution system in the building to realize the deployment of the Internet of Things system in the building, thereby reducing the deployment cost of the Internet of Things system in the building.

[0004] The passive indoor distribution system provided in the embodiment of the present application includes: a signal source, a feeder system, an antenna, an IoT gateway, an IoT-communication combiner, a feeder-sensor coupler, and a radio frequency energy IoT sensor; Wherein, the IoT gateway and the information source are connected to the feeder system through the IoT-communication combiner, the feeder-sensor coupler is inserted into the target feeder of the feeder system, and the RF energy IoT sensor is connected to the coupling end of the feeder-sensor coupler; The IoT gateway is used to generate an IoT radio frequency signal through its built-in radio frequency module, and input the IoT radio frequency signal into the IoT-communication combiner; The IoT-communication combiner is used to combine the IoT radio frequency signal with the communication radio frequency signal of the information source, and input the combined radio frequency signal into the feeder system; The feeder-sensor coupler is used to couple part of the RF signal to the RF energy IoT sensor when the target feeder in the feeder system transmits the combined RF signal; The RF energy IoT sensor is used to convert the RF energy of the part of the RF signal into electrical energy, drive its built-in IoT sensor to collect IoT information, and transmit the IoT information back to the IoT gateway through the feeder system.

[0005] In the embodiments of the present application, an IoT gateway, an IoT-communication combiner, a feeder-sensor coupler, and a RF energy IoT sensor are added to the passive indoor distribution system already deployed in the building, so that the passive indoor distribution system can serve as an IoT system for collecting indoor IoT information of the building while providing wireless communication signal coverage as a communication system, thereby reducing the deployment cost of the IoT system.

[0006] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 The figure is a network diagram of a passive indoor distribution system deployed in a building; Figure 2 A schematic diagram of a network of a passive indoor distribution system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a radio frequency energy IoT sensor provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of another radio frequency energy IoT sensor provided in an embodiment of the present application; Figure 5 A schematic diagram of a switch circuit provided in an embodiment of the present application; Figure 6 A schematic diagram of another network configuration of a passive indoor distribution system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0008] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0009] In the related art, in order to enhance the wireless communication signal coverage in the building, an indoor distribution system is usually deployed in the building. The indoor distribution system is used to transmit and distribute the communication signals of the base station and other signal sources to various areas in the building to achieve indoor communication signal coverage in the building. Indoor distribution systems include: Active Indoor Distribution System (AIDS) and Passive Indoor Distribution System (PIDS). The passive indoor distribution system is widely deployed due to its high stability, uniform signal coverage and low deployment cost.

[0010] Please see Figure 1, which is a schematic diagram of a passive indoor distribution system deployed in a building. Figure 1 As shown, the passive indoor distribution system includes: a signal source 110 , a feeder system 130 and multiple antennas 140 .

[0011] The information source 110 is used to provide a communication radio frequency signal, which is, for example, a communication base station. The communication radio frequency signal is a radio frequency signal in a communication frequency band and is used to transmit communication information.

[0012] The feeder system 130 is used to transmit and distribute the communication radio frequency signal to each antenna 140. The feeder system 130 is composed of passive components and feeders, and the passive components include: a coupler, a power divider, and the like.

[0013] The antenna 140 is arranged indoors in the building to convert the communication signal into a wireless communication signal and provide wireless communication signal coverage indoors. The multiple antennas 140 are arranged at different locations to provide wireless communication signal coverage for different indoor areas in the building. For example, the multiple antennas 140 can be respectively arranged in multiple indoor spaces of the building, and one or more antennas 140 can be arranged in each indoor space.

[0014] The passive indoor distribution system provided in the embodiment of the present application is based on the passive indoor distribution system deployed in the building, and adds an Internet of Things gateway, an Internet of Things-communication combiner, a feeder-sensor coupler and a radio frequency energy Internet of Things sensor. The passive indoor distribution system not only serves as a communication system to provide wireless communication signal coverage for the indoor area of ​​the building, but also serves as an Internet of Things system for collecting indoor Internet of Things information of the building, thereby reducing the deployment cost of the Internet of Things system.

[0015] Figure 2 Schematic diagram of a passive indoor distribution system provided in an embodiment of the present application. Figure 2 As shown, the passive indoor distribution system 200 provided in the embodiment of the present application is Figure 1 On the basis of the passive indoor distribution system 100 shown, an Internet of Things gateway 210, an Internet of Things-communication combiner 220, a feeder-sensor coupler 230 and a radio frequency energy Internet of Things sensor 240 are added.

[0016] Among them, the Internet of Things gateway 210 and the information source 110 are connected to the feeder system 130 through the Internet of Things-communication combiner 220, the feeder-sensor coupler 230 is inserted into the target feeder TW of the feeder system 130, and the RF energy Internet of Things sensor 240 is connected to the coupling end of the feeder-sensor coupler 230.

[0017] The Internet of Things gateway 210 is used to generate an Internet of Things radio frequency signal through its built-in radio frequency module, and input the Internet of Things radio frequency signal into the Internet of Things-communication combiner 220. The Internet of Things radio frequency signal is an radio frequency signal of a specified frequency band for transmitting Internet of Things information. The Internet of Things gateway 210 is an intelligent gateway.

[0018] The IoT-communication combiner 220 is used to combine the IoT RF signal with the communication RF signal of the information source 110, and input the combined RF signal into the feeder system 130. The combined RF signal is a RF signal obtained by combining the IoT RF signal and the communication RF signal.

[0019] The feeder-sensor coupler 230 is used to couple part of the RF signal to the RF energy IoT sensor 240 when the target feeder TW in the feeder system 130 transmits the above-mentioned combined RF signal. The target feeder TW is a designated feeder in the feeder system 130. When the feeder system 130 transmits the combined RF signal to each antenna 140, the combined RF signal is transmitted through the target feeder TW. The position of the target feeder TW can be determined according to the target indoor space, and the target indoor space is the indoor space where IoT information needs to be collected. In the case where there are multiple target indoor spaces where IoT information needs to be collected, multiple target feeders TW can be determined according to the multiple target indoor spaces, and a feeder-sensor coupler 230 can be inserted into each target feeder TW.

[0020] The RF energy IoT sensor 240 is used to convert the RF energy of the above-mentioned part of the RF signal into electrical energy, drive its built-in IoT sensor to collect IoT information, and transmit the IoT information back to the IoT gateway 210 through the feeder system 130. Among them, when multiple feeder-sensor couplers 230 are inserted, there are also multiple RF energy IoT sensors 240, and the multiple RF energy IoT sensors 240 correspond one-to-one to the multiple feeder-sensor couplers 230, and each RF energy sensor is connected to the coupling end of a feeder-sensor coupler 230. IoT information may include: smoke information, temperature information, and humidity information. Accordingly, the IoT sensor in the RF energy IoT sensor 240 may be a smoke sensor, a temperature sensor, and a humidity sensor. The IoT sensors in different RF energy IoT sensors 240 may be different.

[0021] The passive indoor distribution system provided in the embodiment of the present application can also serve as an IoT system. It only requires adding an IoT gateway, an IoT-communication combiner, a feeder-sensor coupler, and a RF energy IoT sensor to the original passive indoor distribution system of the building. There is no need to make excessive modifications to the original passive indoor distribution system. The signal source, feeder system, antenna and other components in the original passive indoor distribution system in the building can continue to be used without replacement, and the deployment cost is low.

[0022] In the embodiment of the present application, the IoT information collected by each RF energy IoT sensor 240 is transmitted back to the IoT gateway 210 through the feeder system 130, and the IoT gateway 210 can further centrally transmit the IoT information collected by all RF energy IoT sensors 240 back to the IoT information management platform. By having the distributed RF energy IoT sensors transmit the collected IoT information back to the IoT gateway, and the IoT gateway centrally transmits the IoT information, the usage of IoT cards can be reduced, the operating cost can be reduced, and maintenance and expansion can be facilitated.

[0023] Furthermore, if the IoT gateway 210 does not receive the returned IoT information, it indicates that the feeder link from the RF energy IoT sensor 240 to the IoT gateway 210 may be abnormal, for example, there may be an abnormality in the coupler and other components in the feeder link, or the cable contact of a certain section of the feeder in the feeder link is poor. Since the return link reuses the feeder link in the feeder system of the original passive indoor distribution system, it can be used to detect the feeder link abnormality of the original passive indoor distribution system and issue an abnormal warning for the feeder link.

[0024] Therefore, the IoT gateway 210 provided in the embodiment of the present application is also used to issue an abnormal warning for the feeder link corresponding to the sensor that failed to return information when the IoT information returned by the RF energy IoT sensor is not received. The information return failure sensor is the RF energy IoT sensor whose IoT information returned is not received by the IoT gateway. The abnormal warning method may include: sending abnormal warning information to the communication management platform, etc.

[0025] For example, when the feeder system receives a combined RF signal, it can transmit the combined RF signal to the feeder-sensor coupler 1 through the feeder link 1. The feeder-sensor coupler 1 can couple part of the RF signal in the combined RF signal to the RF energy IoT sensor 1. The RF energy IoT sensor 1 can convert the RF energy of part of the RF signal into electrical energy, drive its built-in IoT sensor to collect IoT information, and transmit the collected IoT information back to the IoT gateway through the feeder-sensor coupler 1 and the feeder link 1. If the IoT gateway does not receive the IoT information returned by the RF energy IoT sensor 1, it means that the feeder link 1 may be abnormal, and an abnormal warning can be issued for the feeder link 1.

[0026] In an embodiment of the present application, in order to collect more comprehensive IoT information, the target feeder TW can specifically be an antenna access feeder. The antenna access feeder is a section of feeder at the front end of the antenna in the feeder system 130, which is directly connected to the antenna. The number of antennas in the original passive indoor distribution system is usually multiple, and the antenna access feeder of each antenna can be used as a target feeder TW, and a feeder-sensor coupler is inserted into each target feeder TW, and a RF energy IoT sensor is connected to the coupling end of the feeder-sensor coupler. In other words, a feeder-sensor coupler 230 is connected in series to the antenna access feeder of an antenna 140, and is connected to a RF energy IoT sensor 240. The feeder-sensor coupler 230 and the RF energy IoT sensor 240 correspond one-to-one to the antenna 140 in the original passive indoor distribution system.

[0027] Since the feeder link of an RF energy IoT sensor 240 overlaps with the feeder link of its corresponding antenna 140, if the IoT information feedback of an RF energy IoT sensor 240 fails, the feeder link may be abnormal, and the wireless communication signal may be abnormal in the indoor space covered by the corresponding antenna 140.

[0028] Under the above deployment mode, the IoT gateway 210 provided in the embodiment of the present application can also be used to provide an abnormal wireless communication signal warning for the coverage space of the antenna corresponding to the information return failure sensor when the IoT information returned by the RF energy IoT sensor is not received. The information return failure sensor is the RF energy IoT sensor whose returned IoT information is not received by the IoT gateway. The coverage space is the indoor space covered by the wireless communication signal radiated by the antenna.

[0029] The passive indoor distribution system provided in the embodiment of the present application can, through the above-mentioned deployment method, collect more comprehensive IoT information and, based on the IoT gateway's reception of the information sent back by the RF energy IoT sensor, issue an abnormal wireless communication signal warning for the coverage space of the corresponding antenna, thereby facilitating timely understanding and processing of abnormal wireless communication signals in the coverage space and ensuring the communication signal coverage effect of the original indoor passive distribution system.

[0030] In the embodiment of the present application, the partial RF signal is a partial signal in the combined RF signal, which can be an IoT RF signal or a communication RF signal. Considering that the frequency of the communication RF signal is usually high, the loss of its RF energy in link transmission is large. In order to obtain higher RF energy, the partial RF signal can select the IoT RF signal.

[0031] In an embodiment of the present application, the IoT RF signal is used to drive the RF energy IoT sensor, and its frequency is configured to be lower than the communication RF signal. The frequencies of the IoT RF signal and the communication RF signal are different, and the IoT RF signal and the communication RF signal will not interfere with each other. Therefore, while reducing the RF energy transmission loss, it is possible to ensure that both the IoT system and the communication system can operate normally.

[0032] In the embodiment of the present application, the feeder-sensor coupler 230 is a passive coupler. Since the strength of the RF signal received by the RF energy collection chip in the RF energy IoT sensor 240 directly affects the effect of collecting RF energy and the efficiency of converting RF energy into electrical energy, in order to ensure the collection effect and conversion efficiency of RF energy, the model of the feeder-sensor coupler 230 can be determined according to the transmission power of the IoT RF signal, the link loss of the feeder system, and the signal level strength required to be received by the RF energy collection chip. Among them, the signal level strength required to be received by the RF energy collection chip is the level strength at which the RF energy conversion efficiency of the RF energy collection chip is higher than the threshold.

[0033] For example, assuming that the transmission power of the IoT RF signal is 33dB, the link loss is 20dB, and the RF energy harvesting chip in the RF energy IoT sensor requires the received signal level strength to be -4dB, then the maximum coupling loss allowed by the feeder-sensor coupler corresponding to the RF energy IoT sensor is 33-20-(-4)=17dB, and the feeder-sensor coupler can select a coupler with a coupler loss less than or equal to 17dB.

[0034] Furthermore, since the feeder-sensor coupler 230 is inserted at the front end of the antenna 140, the communication signal in the original passive indoor distribution system will also introduce additional insertion loss due to the insertion of the feeder-sensor coupler 230. Therefore, when selecting the model of the feeder-sensor coupler, the insertion loss can be further considered, and a coupler model with a smaller insertion loss is preferably selected. In other words, the model of the feeder-sensor coupler 230 can be determined based on the transmission power of the Internet of Things RF signal, the link loss, the signal level strength required to be received by the RF energy collection chip, and the insertion loss of the alternative coupler.

[0035] For example, the coupler with the coupler loss less than or equal to 17 dB can be used as an alternative coupler, and the coupler with the smallest insertion loss is selected from the alternative coupler models as the feeder-sensor coupler.

[0036] In the embodiment of the present application, the RF energy IoT sensor 240 is driven by RF energy conversion and does not require a power supply to provide electrical energy. Figure 3 , is a schematic diagram of the structure of a radio frequency energy IoT sensor provided in an embodiment of the present application. Figure 3As shown, the RF energy IoT sensor 240 in the embodiment of the present application may specifically include: A radio frequency interface 241 , a balanced-unbalanced impedance converter (Balun) 242 , a matching network 243 , a communication chip 244 , a radio frequency energy collection chip 245 , and an Internet of Things sensor 246 .

[0037] The RF interface 241 is connected to the coupling end of the feeder-sensor coupler 230, and is used to receive part of the RF signal coupled by the feeder-sensor coupler 230. The RF interface 241 may be an SMA interface or an ANT interface.

[0038] The balanced-unbalanced impedance converter 242 is used to convert the above-mentioned part of the radio frequency signal from a single-ended signal to a differential signal.

[0039] The matching network 243 is used to match the impedance of the balanced-unbalanced impedance converter 242 with that of the communication chip 244, so that the differential signal is transmitted to the communication chip 244 with maximum power. Specifically, the matching network 243 converts the impedance of the RxN and RxP ports of the communication chip 244 to 50 ohms, and performs impedance matching with the output end of the balanced-unbalanced impedance converter.

[0040] The communication chip 244 is used to convert the differential signal into a DC signal and transmit the DC signal to the RF energy collection chip. Specifically, after the communication chip 244 converts the differential signal into a DC signal, the DC signal can be output to the RF energy collection chip through VDD.

[0041] The RF energy collection chip 245 is used to collect the RF energy of the DC signal, convert the collected RF energy into electrical energy and provide it to the IoT sensor 246 to drive the IoT sensor 246 to work. Specifically, the RF energy collection chip 245 includes: a RF energy collection circuit and an energy storage capacitor. The RF energy collection circuit can accumulate the RF energy of the DC signal and convert it into electrical energy, and store it in the energy storage capacitor. The energy storage capacitor can power the IoT sensor 246 when the capacitor voltage therein reaches a set voltage.

[0042] The IoT sensor 246 is used to collect IoT information during operation.

[0043] The communication chip 244 is also used to obtain the IoT information and transmit it back. The communication chip 244 can communicate with the IoT sensor 246 through the SPI standard interface to obtain the IoT information collected by the IoT sensor 246 and transmit the IoT information back. The IoT information can be transmitted back to the feeder-sensor coupler 230 through the communication chip 244, the matching network 243, the balanced-unbalanced impedance converter 242, and the RF interface 241. The feeder-sensor coupler 230 transmits the IoT information back to the IoT gateway 210 through the feeder link corresponding to the RF energy IoT sensor 240.

[0044] In the embodiment of the present application, the IoT sensor 246 is a low-power IoT sensor, which can meet the power supply requirements by converting power through radio frequency energy. In some cases, the IoT sensor 246 is a high-power IoT sensor, such as a smoke sensor, which cannot meet its power supply requirements by converting power through radio frequency energy. Figure 4 As shown, the RF energy IoT sensor 240 provided in the embodiment of the present application further includes: a battery 247 and a switch switching circuit 248, wherein the switch switching circuit 248 is used to select the RF energy collection chip 245 or the battery 247 to power the IoT sensor 246 according to the voltage of the energy storage capacitor in the RF energy collection chip 245.

[0045] Specifically, the switch switching circuit 248 can select the RF energy collection chip 245 to power the IoT sensor 246 when the voltage of the energy storage capacitor reaches a threshold value, and the switch switching circuit 248 can select the battery 247 to power the IoT sensor 246 when the voltage of the energy storage capacitor does not reach the threshold value.

[0046] The RF energy IoT sensor provided in the embodiment of the present application combines RF energy with batteries to power IoT sensors with high power consumption, thereby extending the battery life while reducing deployment costs.

[0047] Figure 5 248 is an example of a circuit structure of a switch switching circuit provided in an embodiment of the present application. Figure 5 As shown. Figure 5 As shown, the switch switching circuit 248 includes: A first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a pull-down resistor R1.

[0048] The drain of the first MOS transistor Q1 is connected to the voltage output terminal VBAT of the battery 247, and the source of the first MOS transistor Q1 is connected to the source of the third MOS transistor Q3; the gate of the first MOS transistor Q1 and the gate of the third MOS transistor Q3 are connected to the voltage detection terminal VCAP_OK of the energy storage capacitor in the RF energy collection chip; The source of the second MOS transistor Q2 is connected to the voltage output terminal VOUT of the RF energy collection chip 245, and the drain of the second MOS transistor Q2 is connected to the drain of the third MOS transistor Q3; the gate of the second MOS transistor Q2 is connected between the source of the first MOS transistor Q1 and the source of the third MOS transistor Q3, and is grounded via the pull-down resistor; The drain of the third MOS tube Q3 is connected to the voltage input terminal VCC of the IoT sensor 246 .

[0049] When VCAP_OK is at a low level, the channels of the first MOS tube Q1 and the third MOS tube Q3 are turned on. Since the first MOS tube Q1 and the third MOS tube Q3 are turned on, the connection between the gate of the second MOS tube Q2 and the first MOS tube Q1 and the third MOS tube Q3 causes it to become a high level, and the channel of the second MOS Q2 is closed, so that VBAT is turned on with VCC, and VOUT is disconnected with VCC, so that the battery 247 supplies power to the IoT sensor 246.

[0050] When VCAP_OK is at a high level, the channels of the first MOS transistor Q1 and the third MOS transistor Q3 are closed, the first MOS transistor Q1 and the third MOS transistor Q3 are disconnected, and the second MOS transistor Q2 is turned on, so that VBAT is disconnected from VCC, and VOUT is turned on from VCC, so that the RF energy collection chip 245 uses the electric energy converted from RF energy to power the IoT sensor 246.

[0051] Among them, Figure 5 In the switch switching circuit shown, the third MOS tube Q3 is placed in reverse, and its internal diode structure prevents the current from flowing from VCC to VBAT. When the VCC voltage is higher than VBAT, due to the reverse direction of Q3, the current cannot pass through the channel of Q3, thereby preventing VCC from flowing back to VBAT, thereby protecting the battery.

[0052] The above is based on the passive indoor distribution system deployed in the building. Figure 1Taking the system shown as an example, the passive indoor distribution system provided by the embodiment of the present application is described. It is worth mentioning that the passive indoor distribution system deployed in the building can also be other systems, and the passive indoor distribution system provided by the embodiment of the present application can also be obtained by adding an Internet of Things gateway, an Internet of Things-communication combiner, a feeder-sensor coupler, and a radio frequency energy Internet of Things sensor on the basis of other passive indoor distribution systems deployed in the building.

[0053] For example, another passive indoor distribution system deployed in a building has multiple signal sources 110, which can be signal sources of different communication operators' systems. The multiple signal sources 110 are connected to the feeder system 130 through the multi-system access platform 120. Figure 6 As shown, the passive indoor distribution system provided in the embodiment of the present application can be obtained by adding an Internet of Things gateway 210, an Internet of Things-communication combiner 220, a feeder-sensor coupler 230, and an RF energy Internet of Things sensor 240 to the passive indoor distribution system. Among them, after multiple information sources 110 are combined through the multi-system access platform 120, they are connected to the Internet of Things-communication combiner 220 with the Internet of Things gateway 210, and the Internet of Things-communication combiner 220 is inserted into the back end of the multi-system access platform 120 to combine the Internet of Things RF signal with the communication RF signals of all information sources. The Internet of Things gateway 210, the Internet of Things-communication combiner 220, and the multi-system access platform 120 can be deployed at the same point or in a dispersed manner.

[0054] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A passive indoor distribution system, comprising: A signal source, a feeder system and an antenna, wherein the passive indoor distribution system further comprises: IoT gateways, IoT-communication combiners, feeder-sensor couplers, and RF energy IoT sensors; Wherein, the IoT gateway and the information source are connected to the feeder system through the IoT-communication combiner, the feeder-sensor coupler is inserted into the target feeder of the feeder system, and the RF energy IoT sensor is connected to the coupling end of the feeder-sensor coupler; The IoT gateway is used to generate an IoT radio frequency signal through its built-in radio frequency module, and input the IoT radio frequency signal into the IoT-communication combiner; The IoT-communication combiner is used to combine the IoT radio frequency signal with the communication radio frequency signal of the information source, and input the combined radio frequency signal into the feeder system; The feeder-sensor coupler is used to couple part of the RF signal to the RF energy IoT sensor when the target feeder in the feeder system transmits the combined RF signal; The RF energy IoT sensor is used to convert the RF energy of the part of the RF signal into electrical energy, drive its built-in IoT sensor to collect IoT information, and transmit the IoT information back to the IoT gateway through the feeder system.

2. The passive indoor distribution system according to claim 1, characterized in that: The IoT gateway is also used to issue an abnormal warning for the feeder link corresponding to the information feedback failure sensor when the IoT information returned by the RF energy IoT sensor is not received; wherein the information feedback failure sensor is the RF energy IoT sensor whose returned IoT information is not received by the IoT gateway.

3. The passive indoor distribution system according to claim 1, characterized in that: The target feeder includes: an antenna connected to the feeder; the number of the antennas is multiple, and the feeder-sensor coupler, the RF energy IoT sensor and the antenna correspond one to one; The IoT gateway is also used to issue an abnormal wireless communication signal warning for the coverage space of the antenna corresponding to the information feedback failure sensor when the IoT information returned by the RF energy IoT sensor is not received; the information feedback failure sensor is the RF energy IoT sensor whose returned IoT information is not received by the IoT gateway.

4. The passive indoor distribution system according to claim 1, characterized in that: The partial radio frequency signal is: the Internet of Things radio frequency signal; the frequency of the Internet of Things radio frequency signal is lower than the frequency of the communication radio frequency signal.

5. According to the passive indoor distribution system of claim 4, the model of the feeder-sensor coupler is determined based on the transmission power of the Internet of Things RF signal, the link loss of the feeder system, and the signal level strength required to be received by the RF energy collection chip in the RF energy Internet of Things sensor.

6. The passive indoor distribution system according to claim 5, characterized in that: The model of the feeder-sensor coupler is determined based on the transmission power of the Internet of Things RF signal, the link loss of the feeder system, the signal level strength required to be received by the RF energy collection chip in the RF energy Internet of Things sensor, and the insertion loss of the alternative coupler.

7. The passive indoor distribution system according to claim 1, characterized in that: The radio frequency energy IoT sensor comprises: RF interface, balanced-unbalanced impedance converter, matching network, communication chip, RF energy harvesting chip and IoT sensor; Wherein, the radio frequency interface is connected to the coupling end of the feeder-sensor coupler and is used to receive part of the radio frequency signal coupled by the feeder-sensor coupler; The balanced-unbalanced impedance converter is used to convert the part of the radio frequency signal from a single-ended signal to a differential signal; The matching network is used to match the impedance of the balanced-unbalanced impedance converter with that of the communication chip, so that the differential signal is transmitted to the communication chip with maximum power; The communication chip is used to convert the differential signal into a DC signal, and transmit the DC signal to the radio frequency energy collection chip; The RF energy collection chip is used to collect the RF energy of the DC signal, convert the collected RF energy into electrical energy and provide it to the IoT sensor to drive the IoT sensor to work; The IoT sensor is used to collect IoT information when working; The communication chip is also used to obtain the IoT information and transmit it back.

8. The passive indoor distribution system according to claim 7, characterized in that: The radio frequency energy IoT sensor also includes: Battery and switch circuit; The switch switching circuit is used to select the radio frequency energy collection chip or the battery to power the Internet of Things sensor according to the voltage of the energy storage capacitor in the radio frequency energy collection chip.

9. The passive indoor distribution system according to claim 8, characterized in that: The switch switching circuit includes: a first MOS transistor, a second MOS transistor, a third MOS transistor and a pull-down resistor; The drain of the first MOS tube is connected to the voltage output terminal of the battery, and the source of the first MOS tube is connected to the source of the third MOS tube; the gate of the first MOS tube and the gate of the third MOS tube are connected to the voltage detection terminal of the energy storage capacitor in the RF energy collection chip; The source of the second MOS tube is connected to the output end of the RF energy collection chip, and the drain of the second MOS tube is connected to the drain of the third MOS tube; the gate of the second MOS tube is connected between the source of the first MOS tube and the source of the third MOS tube, and is grounded through the pull-down resistor; The drain of the third MOS tube is connected to the voltage input terminal of the IoT sensor.

10. The passive indoor distribution system according to claim 1, characterized in that: The IoT information includes: smoke information, temperature information or humidity information.

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