Antenna, antenna assembly, fire-fighting detector and fire-fighting detection system

Abstract

The utility model provides an antenna, an antenna assembly, a fire-fighting detector and a fire-fighting detection system. The antenna includes: an antenna body; a first included angle is formed between the antenna feed circuit branch knot and the antenna main body; a second included angle is formed between the antenna tail end and the antenna main body; wherein the antenna main body, the antenna feed circuit branch knot and the antenna tail end are integrated on the same circuit board, and the first included angle is different from the second included angle. According to the antenna, the antenna main body, the antenna feed circuit branch knot and the antenna tail end are integrated on the same circuit board, the integration level is high, the antenna is not easily influenced by the environment, and the reliability and the stability of the antenna can be improved. In addition, the antenna disclosed by the utility model supports ISM frequency bands of European and North America, and meets the requirements of multiple countries or regions.

Description

Technical Field

[0001] The present disclosure generally relates to the field of communication technologies, and particularly to an antenna, an antenna assembly, a fire detector, and a fire detection system. Background Art

[0002] In the context of the rapid development of smart home and Internet of Things technologies, wireless smoke detector alarms have been widely used in the field of fire safety due to their advantages such as easy installation, no need for wiring, easy maintenance, and wide communication range.

[0003] Most common fire detectors on the market currently adopt a design scheme of a separate antenna and / or a separate radio frequency module. Although this design scheme meets the requirements of wireless signal transmission to a certain extent, it has the following disadvantages: the separate antenna and / or the separate radio frequency module are vulnerable to the environment, easy to be damaged, the signal is unstable, which affects the reliability of the fire detector, and the structure is not simple enough, the installation is complex, and it is inconvenient to use. Therefore, there is an urgent need to provide an antenna and / or an antenna assembly to solve the above defects and improve the reliability of the fire detector.

[0004] The content of the background art section is only the technology known to the inventor and does not of course represent the prior art in this field. Summary of the Utility Model

[0005] In view of one or more of the problems existing in the prior art, the present disclosure provides an antenna, including:

[0006] An antenna body;

[0007] An antenna feed line stub, forming a first angle with the antenna body; and

[0008] An antenna end, forming a second angle with the antenna body;

[0009] Wherein, the antenna body, the antenna feed line stub, and the antenna end are integrated on the same circuit board, and the first angle is different from the second angle.

[0010] Optionally, the antenna is in a "π" shape; the first angle is 90°, and the second angle is 135°.

[0011] Optionally, the antenna body is 22.72 ± 1 mm in length and 3.01 ± 1 mm in width; the antenna feed line stub is 16.44 ± 1 mm in length and 3.01 ± 1 mm in width; the antenna end is 25.62 ± 1 mm in length and 3.01 ± 1 mm in width.

[0012] Optionally, the operating frequency band supported by the antenna is 862 - 870 MHz.

[0013] Optionally, the operating frequency band supported by the antenna is 902 - 928 MHz.

[0014] Optionally, the circuit board includes the circuit board of a fire detector.

[0015] Optionally, the circuit board includes a solder mask layer and a three-proof layer, the three-proof layer covers the solder mask layer, and the solder mask layer covers the antenna.

[0016] Optionally, there are no components at the end direction of the antenna, and no copper is laid.

[0017] The present disclosure also provides an antenna assembly, including:

[0018] The antenna as described above;

[0019] A radio frequency module connected to the antenna; and

[0020] A "π"-type antenna matching circuit connected to the antenna and the radio frequency module;

[0021] Wherein, the antenna, the radio frequency module and the "π"-type antenna matching circuit are arranged on the same circuit board.

[0022] Optionally, the antenna assembly further includes: a plurality of matching positions arranged on the circuit board, connected to the antenna feeder stub, suitable for impedance matching; the plurality of matching positions successively include a first parallel matching position, a series matching position and a second parallel matching position from near to far relative to the antenna feeder stub.

[0023] Optionally, the radio frequency module is fixedly arranged on the circuit board or detachably arranged on the circuit board.

[0024] The present disclosure also provides a fire detector, including:

[0025] A wireless communication module including the antenna assembly as described above;

[0026] A control module connected to the wireless communication module; and

[0027] A smoke sensing module connected to the control module;

[0028] Wherein, the wireless communication module, the control module and the smoke sensing module are arranged on the same circuit board.

[0029] Optionally, the fire detector further includes: a power supply switch and a power supply module arranged on the circuit board, the power supply switch connects the power supply module and the control module, and when the power supply switch is closed, the power supply module can supply power to the wireless communication module, the control module and the smoke sensing module.

[0030] Optionally, the control module includes:

[0031] An information processing unit; and

[0032] A buzzer module, connected to the power supply switch and the information processing unit, includes:

[0033] A buzzer;

[0034] A buzzer driving module; and

[0035] A boost driving module, connected to the power supply switch, the buzzer, and the buzzer driving module, and powered from the power supply module through the power supply switch to supply power to the buzzer and the buzzer driving module; the boost driving module is further connected to the information processing unit, and the information processing unit can collect the output voltage of the boost driving module and control the operation of the boost driving module based on the output voltage.

[0036] Optionally, the fire detector further includes:

[0037] A clock module, an encryption module, and a storage module connected to the information processing unit, where the clock module and the encryption module are integrated in the control module, and the storage module is integrated in the control module or externally disposed to the control module;

[0038] The fire detector further includes: a first shielding cover covering the information processing unit in the control module; and a second shielding cover covering the information processing unit in the wireless communication module.

[0039] Optionally, the smoke sensing module includes:

[0040] A smoke maze, disposed on the circuit board;

[0041] A red light-emitting diode, connected to the information processing unit, adapted to emit red light to preliminarily sense whether there are smoke particles in the smoke maze;

[0042] A blue light-emitting diode, connected to the information processing unit, adapted to emit blue light to re-sense whether there are the smoke particles in the smoke maze;

[0043] A photoelectric receiver, connected to the information processing unit, adapted to receive the scattered light of the red light and generate a first current, and / or receive the scattered light of the blue light and generate a second current;

[0044] A current-voltage conversion circuit, connected to the photoelectric receiver and the information processing unit, capable of converting the first current into a first voltage, and / or converting the second current into a second voltage and amplifying it, and the information processing unit determines the smoke concentration based on the first voltage and / or the amplified second voltage.

[0045] Optionally, the wireless communication module further includes one or more of a WiFi module, a 4G module, a 5G module, a Zigbee module, an NB-IOT module, or a Bluetooth module, and the fire detector can be communicatively connected to other fire detectors through the wireless communication module.

[0046] Optionally, the fire detector further includes:

[0047] An upper shell including a light guide portion;

[0048] A middle shell connected to the upper shell and including the circuit board; and

[0049] A bottom shell connected to the middle shell.

[0050] Optionally, the fire detector further includes:

[0051] A base connecting the bottom shell.

[0052] Optionally, the middle shell includes an opening, and the RF module is detachably disposed on the circuit board through the opening.

[0053] The present disclosure also provides a fire detection system, including:

[0054] A plurality of fire detectors as described above; and

[0055] A total control module connected to the fire detectors to monitor the operation of the fire detectors, and the fire detectors can be communicatively connected through the wireless communication module to achieve synchronous alarm.

[0056] The antenna of the present disclosure integrates the antenna main body, the antenna feed line stub, and the antenna end on the same circuit board, with high integration, not easily affected by the environment, and can improve the reliability and stability of the antenna. In addition, the antenna of the present disclosure supports the ISM frequency bands in Europe and North America, meeting the requirements of multiple countries or regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the embodiments of the present disclosure, and do not constitute a limitation to the present disclosure. In the drawings:

[0058] Figure 1 The schematic diagram of the antenna assembly according to some embodiments of the present disclosure is shown,

[0059] Figure 2 The partial enlarged schematic diagram of the antenna assembly according to some embodiments of the present disclosure is shown.

[0060] Figure 3Shows an overall schematic diagram of a fire detector according to some embodiments of the present disclosure.

[0061] Figure 4 Shows a top view of a fire detector according to some embodiments of the present disclosure.

[0062] Figure 5 Shows a side view of a fire detector according to some embodiments of the present disclosure.

[0063] Figure 6 Shows an exploded schematic diagram of a fire detector according to some embodiments of the present disclosure.

[0064] Figure 7 Shows a partial schematic diagram of a fire detector according to some embodiments of the present disclosure.

[0065] Figure 8 Shows a circuit schematic diagram of a fire detector according to some embodiments of the present disclosure.

[0066] Figure 9 Shows a schematic diagram of a fire detection system according to some embodiments of the present disclosure. Detailed implementation manners

[0067] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and the description are considered to be exemplary in nature and not restrictive.

[0068] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless otherwise specifically defined.

[0069] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0070] In the present disclosure, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0071] Many different embodiments or examples are provided below to implement different structures of the present disclosure. To simplify the present disclosure, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0072] The preferred embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not used to limit the present disclosure.

[0073] The present disclosure provides an antenna and an antenna assembly. Figure 1 The schematic diagram of the antenna assembly 10 according to some embodiments of the present disclosure is shown. Figure 2 The partial enlarged schematic diagram of the antenna assembly 10 according to some embodiments of the present disclosure is shown. The following references Figure 1 and Figure 2 are used for description.

[0074] The antenna assembly 10 includes an antenna 11, a radio frequency module 12, and a "π"-type antenna matching circuit 13. The radio frequency module 12 is connected to the antenna 11. The "π"-type antenna matching circuit 13 is connected to the antenna 11 and the radio frequency module 12. The antenna 11, the radio frequency module 12, and the "π"-type antenna matching circuit 13 are arranged on the same circuit board B, with high integration, not easily affected by the environment, and can improve the reliability and stability of the antenna.

[0075] The antenna 11 includes an antenna body 111, an antenna feed branch 112 and an antenna end 113. The antenna feed branch 112 forms a first angle θ1 with the antenna body 111. The antenna end 113 forms a second angle θ2 with the antenna body 111. The first angle θ1 is different from the second angle θ2. Preferably, the first angle θ1 is approximately 90°, and the second angle θ2 is approximately 135°. The shape of the antenna 11 is roughly "π"-shaped. The antenna body 111, the antenna feed branch 112 and the antenna end 113 are integrated on the same circuit board B. In other words, the antenna 11 is a board-mounted antenna. Clearance treatment is performed around the antenna 11 to ensure the radiation efficiency of the antenna.

[0076] The routing of the antenna body 111 is perpendicular or approximately perpendicular to the antenna feed branch 112, and runs along the edge of the circuit board B to the end of the board, opposite to the direction of the reference ground, with clearance around it. This section of routing increases the overall area and size of the antenna, so that the antenna can obtain better radiation performance and radiation directivity. The shape and length of the antenna body 111 determine the layout and shape of the antenna structure. In some embodiments, the length L1 of the antenna body 111 is 22.72±1mm, and the width W is 3.01±1mm. Maintaining this width when the circuit board area is limited can enable the antenna to obtain a wider bandwidth, while leaving enough circuit board area to ensure the routing length of the antenna, so that the antenna can be debugged to the required operating frequency band. It should be understood that the relative distance between the antenna routing and the reference ground is adjustable, which is used to optimize the antenna's performance such as return loss, radiation efficiency and radiation direction.

[0077] The antenna feed branch 112 is led out from the RF module 12, passes through the "π"-shaped antenna matching circuit 13, and is routed to the clearance area at the edge of the circuit board B. The hardware layout is compact, which can save the area of ​​the circuit board to save costs, and enable the antenna 11 to obtain a larger clearance area. The antenna feed branch 112 can be routed in the opposite direction of the reference ground to the edge of the circuit board structure to obtain a larger clearance area and better antenna radiation directivity. The length L2 of the antenna feed branch 112 determines the overall layout and routing shape of the antenna, which can be adjusted according to the actual circuit board size and environmental clearance. The width W of the antenna feed branch 112 structurally strives for a larger clearance for the overall antenna layout, and adjusting the width W can adjust the impedance and bandwidth, which can optimize the return loss of the antenna. In some embodiments, the length L2 of the antenna feed branch 112 is 16.44±1mm, and the width W is 3.01±1mm.

[0078] The antenna end 113 runs along the edge of the circuit board, forming an angle of approximately 135° with the antenna body 111. The length L3 of the antenna end 113 determines the final required operating frequency point of the antenna. In some embodiments, the length L3 of the antenna end 113 is 25.62 ± 1 mm, and the width W3 is 0.01 ± 1 mm. The direction of the antenna end 113 has no device setting and no copper plating is provided to improve the anti-interference performance of the antenna 11 and enhance the radiation performance of the antenna 11.

[0079] It should be understood that the various parameters of the above antenna 11 are only exemplarily shown, and the present disclosure is not limited thereto. In actual applications, appropriate adjustments can be made according to requirements, and these are all within the protection scope of the present disclosure.

[0080] In some embodiments, the antenna 11 supports the ISM band (Industrial, Scientific, Medical Band). Specifically, the antenna 11 supports the European ISM band. For example, the operating frequency band supported by the antenna 11 is 862 - 870 MHz. Further, the antenna 11 supports the 868 - 868.6 MHz band. Furthermore, the antenna 11 supports the 868.3 MHz band. In addition, the antenna 11 also supports the North American ISM band. For example, the operating frequency band supported by the antenna 11 is 902 - 928 MHz. Further, the antenna 11 supports the 915 MHz band. It should be understood that the various parameters of the antenna 11 can be at least partially adjusted to meet the requirements of the ISM bands in different regions.

[0081] In some embodiments, the antenna assembly 10 further includes a plurality of matching positions provided on the circuit board B. The plurality of matching positions are connected to the antenna feed stub 112 and are adapted for impedance matching. The plurality of matching positions include a first parallel matching position P1, a series matching position S, and a second parallel matching position P2 in sequence from near to far relative to the antenna feed stub 112. By means of series and parallel inductors and capacitors, the antenna performance can be assisted and optimized on the basis of antenna trace debugging, enabling the antenna to obtain better impedance matching and a wider operating bandwidth. It should be understood that the first parallel matching position P1 is the matching position closest to the antenna feed stub 112 and takes effect first. For the single-frequency operating frequency band of the present disclosure, the matching scheme used is not unique, and the optimal matching circuit can be selected according to actual debugging, and these are all within the protection scope of the present disclosure.

[0082] The RF module 12 includes an RF transceiver circuit, and the RF transceiver circuit is connected to the antenna 11 to implement a wireless communication function. In some embodiments, the RF module 12 can be fixedly disposed on the circuit board B, so as to be integrally formed with the antenna 11 and the circuit board B, with high integration, not easily affected by the environment, which can improve the stability and reliability of the antenna assembly, and can simplify the structural complexity of the antenna assembly, reduce the complexity of installation and maintenance, and improve the automation production efficiency. In other embodiments, the RF module 12 is detachably disposed on the circuit board B. In other words, the RF module 12 can be detachably connected to the circuit board B and can be detachably connected to the antenna 11, which is convenient for disassembly, repair or replacement, can improve the flexibility of use of the antenna assembly, and meet different requirements.

[0083] In some embodiments, the circuit board B includes, but is not limited to, the circuit board of a fire detector. The circuit board B includes a solder mask layer (not shown in the figure) and a three-proof layer (not shown in the figure). The three-proof layer covers the solder mask layer, and the solder mask layer covers the antenna 11, which plays a role in protecting the antenna 11, enhancing the abilities of the antenna 11 such as anti-oxidation, anti-soldering bridge, moisture-proof, humidity-proof, dust-proof, salt spray-proof, and mildew-proof, and improving the durability, stability and reliability of the antenna.

[0084] For the antenna of the present disclosure, the antenna body, the antenna feed line stub and the antenna end are integrated on the same circuit board, with high integration and not easily affected by the environment, which can improve the reliability and stability of the antenna. In addition, the antenna of the present disclosure supports the ISM frequency bands in Europe and North America, meeting the requirements of multiple countries or regions.

[0085] For the antenna assembly of the present disclosure, by adopting the above antenna, and the RF module can be integrated with the above antenna on the same circuit board, with high integration and not easily affected by the environment, which can improve the reliability and stability of the antenna assembly.

[0086] The present disclosure also provides a fire detector. Figures 3 to 5 The overall schematic diagram, top view and side view of the fire detector 20 according to some embodiments of the present disclosure are respectively shown. Figure 6 The exploded schematic diagram of the fire detector 20 according to some embodiments of the present disclosure is shown. Figure 7 The partial schematic diagram of the fire detector 20 according to some embodiments of the present disclosure is shown. Figure 8 The circuit schematic diagram of the fire detector 20 according to some embodiments of the present disclosure is shown. The following is combined with Figures 3 to 8 description.

[0087] The fire detector 20 includes an upper shell 21, a middle shell 22 and a bottom shell 23. The upper shell 21 includes a light guide portion 211. The light guide portion 211 can guide the prompt light to make the prompt light more uniform, so as to more effectively remind the user. The middle shell 22 is connected to the upper shell 21, and the middle shell 22 includes a circuit board B. The above antenna assembly 10 is arranged on the circuit board B. The bottom shell 23 is connected to the middle shell 22. In some embodiments, the fire detector 20 may further include a base (not shown in the figure). The base can be connected to the bottom shell 23 to fix the fire detector to positions such as the roof.

[0088] The fire detector 20 includes a wireless communication module 24, a control module 25 and a smoke sensing module 26. The control module 25 is connected to the wireless communication module 24. The smoke sensing module 26 is connected to the control module 25. The wireless communication module 24, the control module 25 and the smoke sensing module 26 are arranged on the same circuit board B to improve the integration of the fire detector and realize a miniaturized design.

[0089] The wireless communication module 24 includes the antenna assembly 10 as described above, and the antenna assembly 10 includes a radio frequency module 12. In addition, the wireless communication module 24 may further include one or more of a WiFi module, a 4G module, a 5G module, a Zigbee module, an NB-IOT module or a Bluetooth module. The fire detector 20 can be communicatively connected to other fire detectors through the wireless communication module 24 to achieve interconnected synchronous alarm with other fire detectors, which is beneficial to achieving a more effective, reliable and timely alarm. In addition, the fire detector 20 can also be connected to a total control module (see the schematic total control module C) through the wireless communication module 24, and can report alarm information or operating status and other information to the total control module. The total control module can be a cloud controller, or can also be a controller of a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a wearable device, etc. It should be understood that the fire detector 20 can also be interconnected with the mobile terminal through the wireless communication module 24, and these are all within the protection scope of the present disclosure. Figure 9 In some embodiments, the middle shell 22 may include an opening (not shown in the figure). The radio frequency module 12 can be detachably arranged on the circuit board B through the opening, which is convenient for disassembly, maintenance or replacement, can improve the flexibility of use of the fire detector, and meet different requirements. In other embodiments, the middle shell 22 can also be of a closed design, and the radio frequency module 12 can be fixedly integrated on the circuit board B, which can improve the integration degree, reduce the installation complexity, and avoid environmental interference at the same time.

[0090]

[0091] ​In some embodiments, the fire detector 20 further includes a power supply switch K and a power supply module 27 disposed on the circuit board B. The power supply switch K is connected to the power supply module 27 and the control module 25. When the power supply switch K is closed, the power supply module 27 can supply power to the wireless communication module 24, the control module 25, and the smoke sensing module 26. The power supply switch K can be a mechanical switch, but the present disclosure is not limited thereto. In other embodiments, the power supply switch K can also be a semiconductor switch. In this case, the circuit structure of the fire detector can be appropriately adjusted, and these are all within the protection scope of the present disclosure.

[0092] In some embodiments, the control module 25 includes an information processing unit 251 and a buzzer module 252. The buzzer module 252 is connected to the power supply switch K and the information processing unit 251. The buzzer module 252 includes a buzzer 2521, a buzzer driving module 2522, and a boost driving module 2523. The buzzer driving module 2522 is connected to the boost driving module 2523 to drive the buzzer 2521 to sound through the boost driving module 2523. The boost driving module 2523 is connected to the power supply switch K, the buzzer 2521, and the buzzer driving module 2522. The boost driving module 2523 can draw power from the power supply module 27 through the power supply switch K to supply power to the buzzer 2521 and the buzzer driving module 2522. The boost driving module 2523 is also connected to the information processing unit 251. The information processing unit 251 can collect the output voltage of the boost driving module 2523 and control the operation of the boost driving module 2523 based on the output voltage.

[0093] In some embodiments, the fire detector 20 further includes a clock module 28, an encryption module 29, and a storage module 30 connected to the information processing unit 251. The clock module 28 and the encryption module 29 can be integrated into the control module 27. The clock module 28 is used to provide a synchronous clock. The encryption module 29 can encrypt the inherent parameter information, operation log data, user data information, etc. of the fire detector 20 to ensure the security of information data. The storage module 30 can be integrated into the control module 27. Or the storage module 30 can also be externally disposed relative to the control module 27. The storage module 30 is used to store the inherent parameter information, operation log data, user data information, etc. of the fire detector 20.

[0094] In some embodiments, the storage module 30 may include a random access memory (RAM), and may also include a non-volatile memory. Further, it may include at least one of a phase-change random access memory (PRAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a read-only memory (ROM), and an electrically erasable programmable read only memory (EEPROM).

[0095] In some embodiments, the fire detector 20 further includes a first shield (not shown in the figure) covering the information processing unit 251 in the coverage control module 27 and a second shield (not shown in the figure) covering the information processing unit (not shown in the figure) in the wireless communication module 24, which can improve the signal stability in an electromagnetic interference environment, thereby improving the reliability of the fire detector.

[0096] In some embodiments, the smoke sensing module 26 includes a smoke maze, a red light-emitting diode, a blue light-emitting diode, a photoelectric receiver, and a current-voltage conversion circuit. The smoke maze is disposed on the circuit board B. The red light-emitting diode is connected to the information processing unit 251 and is adapted to emit red light to initially sense whether there are smoke particles (e.g., large-particle black smoke) in the smoke maze. The blue light-emitting diode is connected to the information processing unit 251 and is adapted to emit blue light to sense again whether there are smoke particles (e.g., small-particle white smoke) in the smoke maze, with strong anti-water vapor false alarm ability, which is conducive to achieving accurate alarm. The photoelectric receiver is connected to the information processing unit 251 and is adapted to receive the scattered light of the red light and generate a first current I1, and / or receive the scattered light of the blue light and generate a second current I2. The current-voltage conversion circuit is connected to the photoelectric receiver and the information processing unit 251, and can convert the first current I1 into a first voltage U1, and / or convert the second current I2 into a second voltage U2 and amplify it. The information processing unit determines the smoke concentration based on the first voltage U1 and / or the amplified second voltage U2'. When the smoke concentration is higher than the threshold, the information processing unit 251 triggers the fire detector to alarm, drives the buzzer 2521 to emit an alarm signal through the buzzer driving module 2522 to remind the user to pay attention, and sends an alarm signal to other fire detectors connected by communication through the wireless communication module 24, thereby triggering the synchronized alarm of multiple networked fire detectors to timely prompt personnel to evacuate and escape and extinguish the fire.

[0097] In some embodiments, the fire detector 20 may further include an LED indicator light (not shown in the figure) connected to the information processing unit 251. For example, for foreign countries, it can be a single red light indicator. For domestic use, it can be a red, green, and yellow three-color light indicator. The indicator light can be used for fire alarm indication, standby status indication, low battery reminder, or other custom functions, providing richer and more intuitive alarm information. The light emitted by the indicator light can be displayed to the user through the light guide component 211.

[0098] For the fire detector of the present disclosure, by adopting the above antenna assembly, the antenna, radio frequency module, and "π"-type antenna matching circuit of the antenna assembly can be integrated on the circuit board of the fire detector, making it less susceptible to the environment, not easily damaged, with more stable signal transmission, which is beneficial to improving the reliability and stability of the fire detector, achieving timely and accurate alarm, and having a more concise structure, simple installation, and convenient use.

[0099] It should be noted that the fire detector of the present disclosure is not limited to the smoke detector, and may also include other types of detectors, which can be realized by appropriately adding or reducing some modules, and can be specifically set according to actual needs. In addition, the fire detector of the present disclosure is widely used in various scenarios, including but not limited to the following scenarios: For example, it is applied to residential buildings, installed in rooms such as kitchens and bedrooms and corridors to detect fire hazards in a timely manner and protect the safety of the residential building and its family members. Another example is that it is applied to commercial buildings, such as office buildings, shopping malls, hotels, etc., to ensure the fire safety of public places and reduce the fire risk. For example, it is applied to industrial facilities, such as installed in industrial sites such as factories and warehouses, to monitor fire hazards during the production process and ensure production safety. In addition, it can also be applied to public transportation, such as installed on means of transportation such as subways, trains, and airplanes to detect fires in a timely manner and ensure the safety of drivers and passengers.

[0100] The present disclosure also provides a fire detection system. Figure 9 The schematic diagram of a fire detection system 300 according to some embodiments of the present disclosure is shown. As Figure 9 shown, the fire detection system 300 includes a plurality of fire detectors 20 as described above and a total control module C. The total control module C is connected to the fire detectors 20 to monitor the operation of the fire detectors 20. The fire detectors 20 can be communicatively connected through the wireless communication module 24 to achieve synchronous alarm and interconnected alarm, which is beneficial to improving the effectiveness and reliability of the fire protection system and ensuring the safety of users' lives and property.

[0101] The fire detection system of the present disclosure enables fire detectors to form a network with other fire detectors, achieving data sharing, mutual interconnection and wake-up, and synchronous alarm. This effectively addresses the limitation of traditional fire detectors that can only alarm through local sound prompts, and also effectively solves the problem that in the same building, the alarm sounds on different floors or in remote rooms cannot be heard, resulting in untimely evacuation of personnel, providing an important guarantee for fire safety.

[0102] In some embodiments, the control module / overall control module / information processing unit may include a Central Processing Unit (CPU), a Micro Control Unit (MCU), and may also include other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), Complex Programmable Logic Devices (CPLDs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and similar devices and their peripheral circuits.

[0103] Finally, it should be noted that the above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. An antenna, characterized in that: include: Antenna body; The antenna feed branch forms a first angle with the antenna body; and The antenna end forms a second angle with the antenna body; The antenna body, the antenna feed branch and the antenna end are integrated on the same circuit board, and the first angle is different from the second angle.

2. The antenna according to claim 1, characterized in that The antenna is in a "π" shape; the first angle is 90°, and the second angle is 135°.

3. The antenna according to claim 1 or 2, characterized in that: The antenna body is 22.72±1mm long and 3.01±1mm wide; the antenna feed branch is 16.44±1mm long and 3.01±1mm wide; the antenna end is 25.62±1mm long and 3.01±1mm wide.

4. The antenna according to claim 3, characterized in that: The antenna supports an operating frequency band of 862~870Mhz.

5. The antenna according to claim 1 or 2, characterized in that: The antenna supports an operating frequency band of 902~928Mhz.

6. The antenna according to claim 1 or 2, characterized in that: The circuit board comprises a circuit board of a fire detector.

7. The antenna according to claim 6, characterized in that The circuit board comprises a solder resist layer and a three-proof layer, wherein the three-proof layer covers the solder resist layer, and the solder resist layer covers the antenna.

8. The antenna according to claim 1 or 2, characterized in that: There is no component at the end of the antenna and no copper is laid.

9. An antenna assembly, characterized in that: include: The antenna according to any one of claims 1 to 8; A radio frequency module connected to the antenna; and A "π"-shaped antenna matching circuit connected to the antenna and the radio frequency module; Wherein, the antenna, the radio frequency module and the "π"-type antenna matching circuit are arranged on the same circuit board.

10. The antenna assembly according to claim 9, characterized in that: Also includes: A plurality of matching positions arranged on the circuit board are connected to the antenna feed branch and are suitable for impedance matching; the plurality of matching positions include a first parallel matching position, a series matching position and a second parallel matching position in order from near to far relative to the antenna feed branch.

11. The antenna assembly according to claim 9 or 10, characterized in that: The radio frequency module is fixedly arranged on the circuit board, or detachably arranged on the circuit board.

12. A fire detector, characterized in that: include: A wireless communication module, comprising an antenna assembly as claimed in any one of claims 9 to 11; A control module connected to the wireless communication module; and A smoke sensing module connected to the control module; Wherein, the wireless communication module, the control module and the smoke sensing module are arranged on the same circuit board.

13. The fire detector according to claim 12, characterized in that: Also includes: A power switch and a power supply module are arranged on the circuit board, wherein the power switch connects the power supply module and the control module. When the power switch is closed, the power supply module can supply power to the wireless communication module, the control module and the smoke sensing module.

14. The fire detector according to claim 13, characterized in that: The control module comprises: information processing unit; and A buzzer module, connected to the power switch and the information processing unit, includes: buzzer; Buzzer driver module; and A boost driving module is connected to the power switch, the buzzer and the buzzer driving module, and draws power from the power supply module through the power switch to power the buzzer and the buzzer driving module; the boost driving module is also connected to the information processing unit, and the information processing unit can collect the output voltage of the boost driving module and control the operation of the boost driving module based on the output voltage.

15. The fire detector according to claim 14, characterized in that: Also includes: A clock module, an encryption module and a storage module connected to the information processing unit, wherein the clock module and the encryption module are integrated into the control module, and the storage module is integrated into the control module or is external to the control module; The fire detector further comprises: a first shielding cover covering the information processing unit in the control module; and a second shielding cover covering the information processing unit in the wireless communication module.

16. The fire detector according to claim 14, characterized in that: The smoke sensing module comprises: a smoke maze, disposed on the circuit board; a red light emitting diode, connected to the information processing unit, adapted to emit red light to preliminarily sense whether there are smoke particles in the smoke maze; a blue light emitting diode, connected to the information processing unit, adapted to emit blue light to again sense whether the smoke particles exist in the smoke maze; a photoelectric receiver, connected to the information processing unit, adapted to receive the scattered light of the red light and generate a first current, and / or receive the scattered light of the blue light and generate a second current; A current-to-voltage conversion circuit is connected to the photoelectric receiver and the information processing unit, and can convert the first current into a first voltage, and / or convert the second current into a second voltage and amplify it. The information processing unit determines the smoke concentration based on the first voltage and / or the amplified second voltage.

17. The fire detector according to claim 12 or 13, characterized in that: The wireless communication module also includes one or more of a WiFi module, a 4G module, a 5G module, a Zigbee module, a NB-IOT module or a Bluetooth module, and the fire detector can be communicated with other fire detectors through the wireless communication module.

18. The fire detector according to claim 12 or 13, characterized in that: Also includes: An upper shell, including a light guide portion; A middle shell connected to the upper shell and including the circuit board; and The bottom shell is connected to the middle shell.

19. The fire detector according to claim 18, characterized in that: Also includes: A base is connected to the bottom shell.

20. The fire detector according to claim 18, characterized in that: The middle shell comprises an opening, and the radio frequency module is detachably arranged on the circuit board through the opening.

21. A fire detection system, characterized in that: include: A plurality of fire detectors according to any one of claims 12 to 20; and The general control module is connected to the fire detectors to monitor the operation of the fire detectors. The fire detectors can be connected to each other through the wireless communication module to achieve synchronous alarm.

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