Mainboard integrated with antenna and entrance type scanner

Abstract

The utility model provides a mainboard integrated with an antenna and an entrance type scanner, the mainboard integrated with the antenna comprises at least one antenna assembly and a mainboard, and the antenna assembly is integrated on the mainboard; the mainboard comprises at least one antenna clearance area, each antenna assembly is arranged at the edge of one antenna clearance area, the antenna clearance area is arranged on the side wall of the end part of the mainboard, and the antenna clearance area is an area without any metal material; the antenna assembly comprises a microstrip line, a chip capacitor and a chip inductor, and the microstrip line is sequentially connected with the chip inductor, the chip capacitor and the grounding end of the mainboard; the chip capacitor is used for adjusting the resonant frequency of the antenna; the chip inductor is used for adjusting impedance matching of the antenna. The antenna is internally arranged, space is saved, the health protection requirement of a user is met, flexible adjustment of the antenna radiation frequency and impedance matching is achieved by arranging the capacitor and the inductor, and the antenna transmission efficiency is improved.

Description

Technical Field

[0001] The present specification relates to the field of antenna technology, and more particularly to a mainboard with integrated antenna and an entry scanner. Background Art

[0002] With the continuous advancement of technology, the application of portal scanners in the medical field has become more and more extensive. By adopting advanced antenna design and optimization, portal scanners can achieve reliable data transmission in wireless networks, ensure the real-time transmission and accuracy of medical data, and provide timely and effective data support for medical staff. Establishing a reliable wireless connection allows medical staff to easily share and access medical data, conduct real-time collaboration and communication, so as to quickly solve problems, optimize medical processes, and provide patients with more comprehensive and personalized medical services.

[0003] However, there are some challenges in the antenna design of existing portal scanners. First, with the development of communication technology, the requirements for antenna performance are increasing, especially in miniaturized portal scanners. Due to limited space, antennas are usually faced with complex electromagnetic environments. Large-area metal devices such as batteries, heat sinks and brackets absorb, reflect and couple the electromagnetic radiation of antennas, which leads to low transmission efficiency and deterioration of performance of existing antennas. Secondly, existing antennas usually need to be placed on the scanner body with the help of additional connecting wires, thereby increasing the overall volume of the scanner, limiting its application in portal scanning, and the antenna is close to the human body, which poses a safety hazard of excessive electromagnetic absorption ratio (SAR). In addition, the antenna design needs to be constantly debugged to match the impedance of surrounding equipment, and the debugging of existing antennas usually relies on changing the wiring layout. The debugging is difficult and lacks flexibility, and it is difficult to adapt to the diverse needs in different environments. Utility Model Content

[0004] In order to overcome the problems existing in the related art, this specification provides a mainboard with integrated antenna and an entry scanner.

[0005] According to a first aspect of an embodiment of this specification, there is provided a mainboard with an integrated antenna, comprising at least one antenna component and a mainboard, wherein the antenna component is integrated on the mainboard;

[0006] The mainboard includes at least one antenna clearance area, each antenna assembly is arranged at the edge of an antenna clearance area, the antenna clearance area is arranged at the end of the mainboard, and the antenna clearance area is an area that does not contain any metal material;

[0007] The antenna assembly includes a microstrip line, a patch capacitor and a patch inductor, and the microstrip line is sequentially connected to the patch inductor, the patch capacitor and the ground terminal of the mainboard;

[0008] The chip capacitor is used to adjust the resonant frequency of the antenna; the chip inductor is used to adjust the impedance matching of the antenna.

[0009] Furthermore, the number of the antenna clearance areas is two, and the two antenna clearance areas are symmetrically arranged at the ends of the mainboard; each antenna component is arranged at the edge of an antenna clearance area.

[0010] Furthermore, the clearance area of ​​each antenna is greater than or equal to 75 mm 2 , the distance between the antenna clearance areas is greater than or equal to 5 mm and less than or equal to 15 mm.

[0011] Furthermore, the chip inductors and chip capacitors are arranged at equal intervals along the long side of the antenna clearance area.

[0012] Furthermore, each of the antenna components includes a chip inductor and three chip capacitors, and the capacitance value of the chip capacitors is greater than or equal to 0.5 pF and less than or equal to 5 pF.

[0013] Furthermore, the corners of the microstrip line are curved.

[0014] According to a second aspect of the embodiments of this specification, there is provided an entry-type scanner, comprising any one of the above-mentioned mainboards, WiFi modules and main control chips, wherein the WiFi module is connected to the main control chip, and the WiFi module and the main control chip are both arranged on the mainboard;

[0015] The WiFi module is also connected to the microstrip line.

[0016] Furthermore, the working frequency band of the WiFi module is a dual-band band of 2.4G and 5G;

[0017] The WiFi module is arranged at a position close to the antenna clearance area;

[0018] The main control chip is arranged near the WiFi module;

[0019] The main control chip is arranged at a position away from the edge of the main board.

[0020] Furthermore, the WiFi module is arranged at a position which is greater than or equal to 3 mm and less than or equal to 10 mm away from the antenna clearance area;

[0021] The main control chip is arranged within 10 mm from the WiFi module and more than 10 mm from the edge of the mainboard.

[0022] Furthermore, the portal scanner also includes a battery compartment, which is arranged below the main board; the metal portion of the battery compartment away from the antenna clearance area is hollowed out, and the horizontal and vertical distances between the hollowed-out area and the antenna clearance area are not less than 3 mm.

[0023] Furthermore, the portal scanner also includes a battery, and the battery is arranged inside the battery compartment, and the vertical distance between the battery and the antenna clearance area is greater than or equal to 5 mm.

[0024] Furthermore, the entry scanner also includes a scanning component, which is arranged on the main board and connected to the main control chip; the distance between the scanning component and the antenna clearance area is greater than or equal to 3 mm.

[0025] The technical solutions provided by the embodiments of this specification may have the following beneficial effects:

[0026] In the embodiments of this specification, firstly, the antenna is integrated on the mainboard to achieve an integrated and compact design of the antenna and the mainboard, thereby saving space and making it easier to integrate with other components; at the same time, the antenna is built-in, which is beneficial to reducing the size of the scanner, increasing the distance between the antenna and the human body, reducing the SAR value, and meeting the health protection needs of the user; secondly, the antenna component is arranged in a clear area on the mainboard to avoid direct contact with other metal devices, effectively avoiding electromagnetic interference and improving the stability of antenna performance; in addition, the structure of the antenna is also improved, and a microstrip line and a patch capacitor and inductor are used to form the antenna body, so that the antenna radiation frequency and impedance matching can be flexibly adjusted by adjusting the capacitor and inductor values, thereby reducing the difficulty of debugging and ensuring more efficient and smooth data transmission.

[0027] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0029] Figure 1 is a structural schematic diagram of a mainboard with an integrated antenna according to an exemplary embodiment of the present specification;

[0030] Figure 2 is a schematic diagram of the internal structure of an entry-type scanner according to an exemplary embodiment of the present specification;

[0031] Figure 3 is a schematic diagram of the internal structure of another entry-type scanner according to an exemplary embodiment of the present specification;

[0032] Figure 4 is a schematic diagram of the internal structure of another entry-type scanner according to an exemplary embodiment of the present specification;

[0033] Figure 5 It is a schematic diagram of the overall external structure of an entry-type scanner shown in this specification according to an exemplary embodiment.

[0034] Figure numerals: antenna assembly 100, main board 200, antenna clearance area 201, microstrip line 101, chip capacitor 103, chip inductor 102, WiFi module 300, main control chip 400, battery compartment 500, battery 600, scanning assembly 700. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this specification. Instead, they are merely examples of devices and methods consistent with some aspects of this specification as detailed in the appended claims.

[0036] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this specification. The singular forms "a", "the" and "the" used in this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0037] It should be understood that although the terms first, second, third, etc. may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0038] With the continuous advancement of technology, the application of portal scanners in the medical field has become more and more extensive. By adopting advanced antenna design and optimization, portal scanners can achieve reliable data transmission in wireless networks, ensure the real-time transmission and accuracy of medical data, and provide timely and effective data support for medical staff. Establishing a reliable wireless connection allows medical staff to easily share and access medical data, conduct real-time collaboration and communication, so as to quickly solve problems, optimize medical processes, and provide patients with more comprehensive and personalized medical services.

[0039] However, there are some challenges in the antenna design of existing portal scanners. First, with the development of communication technology, the requirements for antenna performance are increasing, especially in miniaturized portal scanners. Due to limited space, antennas are usually faced with complex electromagnetic environments. Large-area metal devices such as batteries, heat sinks and brackets absorb, reflect and couple the electromagnetic radiation of antennas, which leads to low transmission efficiency and deteriorated performance of existing antennas. Secondly, existing antennas usually need to be placed on the scanner body with the help of additional connecting wires, thereby increasing the overall volume of the scanner, limiting its application in portal scanning, and are close to the human body, posing a safety hazard of excessive electromagnetic absorption ratio (SAR). In addition, the antenna design needs to be constantly debugged to match the impedance of surrounding equipment, and the debugging of existing antennas usually relies on changing the wiring layout. The debugging is difficult and lacks flexibility, and it is difficult to adapt to the diverse needs in different environments.

[0040] In view of the above problems, the present application aims to achieve a better antenna transmission effect by improving the positional relationship and structure between the antenna and the scanning device. First, the present application proposes to integrate the antenna on the mainboard to realize an integrated and compact design of the antenna and the mainboard, thereby saving space and making it easier to integrate with other components. This move also realizes the built-in antenna, which is conducive to reducing the volume of the adapted scanner, increasing the distance between the antenna and the human body, reducing the SAR value, and meeting the user's health protection needs. Secondly, the antenna assembly is arranged in the clear area on the mainboard to avoid direct contact with other metal devices, effectively avoiding electromagnetic interference, and improving the stability of antenna performance. In addition, the present application also improves the structure of the antenna, using microstrip lines and patch capacitors and inductors to form the antenna body, so that the antenna radiation frequency and impedance matching can be flexibly adjusted by adjusting the capacitor and inductor values, thereby reducing the difficulty of debugging and ensuring more efficient and smooth data transmission.

[0041] Next, the embodiments of this specification are described in detail.

[0042] Figure 1 It is a structural schematic diagram of a mainboard with an integrated antenna according to an exemplary embodiment of this specification.

[0043] like Figure 1As shown, the mainboard with integrated antenna includes:

[0044] At least one antenna assembly 100 and a mainboard 200, wherein the antenna assembly 100 is integrated on the mainboard 200;

[0045] The mainboard includes at least one antenna clearance area 201, each of the antenna components 100 is arranged at the edge of an antenna clearance area 201, the antenna clearance area 201 is arranged at the end of the mainboard 200, and the antenna clearance area 201 is an area that does not contain any metal material;

[0046] The antenna assembly 100 includes a microstrip line 101, a patch capacitor 103 and a patch inductor 102, and the microstrip line 101 is connected to the patch inductor 102, the patch capacitor 103 and the ground terminal of the mainboard 200 in sequence;

[0047] The chip capacitor 103 is used to adjust the resonant frequency of the antenna; the chip inductor 102 is used to adjust the impedance matching of the antenna.

[0048] In the above-mentioned embodiments, the mainboard integrated with the antenna can be applied to various electronic devices that can use the antenna to transmit wireless signals, such as entry scanners and other types of equipment.

[0049] There is no limit on the number of antenna components integrated on the motherboard. It can be set according to the number of signal input and output channels supported by the antenna signal transmission module in the electronic device during actual application, such as the WiFi module. For example, a device supporting 2x2 MIMO will usually have two antenna components, while a device supporting 3x3 MIMO will have three antenna components.

[0050] The antenna clearance area is used to carry antenna components, and its number should match the number of antenna components. It is located at the end of the mainboard, which is conducive to the antenna components to radiate and transmit signals outward. The specific distribution can be adjusted accordingly based on its number and the layout of other components in the electronic device. As for the area and shape of the antenna clearance area, it can also be adjusted accordingly based on the size, shape and antenna performance requirements of the actual mainboard. For example, the shape of the antenna clearance area can be a rectangle, a rounded rectangle, and other shapes. This application does not make specific restrictions on this.

[0051] When the above-mentioned antenna is applicable to an entry-type scanner, taking into account that such scanners generally adopt a signal transmission module using 2x2MIMO technology, in order to achieve seamless connection with the antenna signal transmission module in the scanner and improve the efficiency of signal transmission, in some embodiments, the number of antenna clearance areas 201 can be optimized to 2, and the two antenna clearance areas 201 are symmetrically arranged at the ends of the mainboard 200; each antenna component 100 is arranged at the edge of an antenna clearance area 201 to ensure that each antenna component 100 can perform at maximum efficiency in its respective clearance area.

[0052] In addition, the antenna design for the entry-type scanner needs to take into special consideration its use environment, that is, the scanner needs to scan deep into the user's mouth, and the oral space is relatively limited. Therefore, the volume of the scanner must be controlled within a small range to avoid affecting the user experience and the quality of the scanning results. Correspondingly, the size of the mainboard 200 in the antenna is also strictly limited. In the design process, the mainboard size, antenna transmission efficiency, and mainboard space utilization can be comprehensively considered to optimize the size and spacing of the antenna clearance area 201 in the mainboard 200 to ensure the optimal signal transmission effect.

[0053] To achieve this goal, in some embodiments, the area of ​​each antenna clearance region 201 may be greater than or equal to 75 mm. 2 To reduce mutual interference between antenna components, in some embodiments, the area of ​​each antenna clearance area 201 can be preferably set to 75mm 2 , in order to reduce mutual interference between antenna components and maximize space utilization within the limited motherboard space. When the antenna clearance area is in the shape of a rectangle or a rounded rectangle, its area can be specifically preferably set to 5mm*15mm.

[0054] In addition, in order to further optimize the antenna performance, in other embodiments, the distance between the antenna clearance areas 201 can also be optimized and set within a range of greater than or equal to 5 mm and less than or equal to 15 mm to reduce interference between different antenna components and improve signal transmission quality and the overall performance of the system.

[0055] At the same time, in the above embodiment, the antenna assembly 100 mainly includes a microstrip line 101, a patch capacitor 103 and a patch inductor 102. The operating frequency of the antenna is adjusted by changing the capacitance of the patch capacitor 103 to adapt it to different wireless communication standards or optimize the signal transmission characteristics; and the patch inductor 102 can be used to reduce the common mode interference and noise in the antenna transmission path, improve the electromagnetic compatibility and performance of the antenna as a whole, and in addition, the patch inductor 102 can also be used to adjust the impedance matching of the antenna to ensure that the energy transmission between the antenna and the transmission line is more efficient and smooth, thereby improving the transmission and receiving efficiency of the antenna. Among them, the specific number of patch capacitors 103 and patch inductors 102 can be adjusted accordingly according to factors such as antenna transmission requirements, frequency band debugging difficulty and cost in actual applications, and the positional relationship between them can also be reasonably set based on the specific size of the antenna clearance area.

[0056] As for the antennas in the entry scanner, since most of them have a specific operating frequency, the number and position relationship of the patch capacitors 103 and the patch inductors 102 can be further optimized based on the operating frequency, combined with factors such as cost, debugging difficulty and aesthetics. Therefore, in some embodiments, each antenna component 100 can be optimized to include one patch inductor 102 and three patch capacitors 103, the capacitance value of the patch capacitor 103 is greater than or equal to 0.5pF and less than or equal to 5pF, and the patch inductors 102 and the patch capacitors 103 are arranged at equal intervals along the long side of the antenna clearance area 201 to achieve a balance between transmission performance, cost and aesthetics. It can be seen from the above description that in the entry scanner, when the antenna clearance area 201 is a rectangle or a rounded rectangle, its area can be preferably set to 5mm*15mm, that is, its long side is 15mm. Therefore, in other embodiments, the spacing between the patch inductor 102 and the patch capacitor 103 can be specifically preferably set to 5mm to obtain a more beautiful visual effect. Of course, in other cases, the spacing between the patch inductor 102 and the patch capacitor 103 can also be set to an unequal spacing arrangement, such as increasing, decreasing, irregular spacing, etc., and this application does not make specific restrictions on this.

[0057] As for the microstrip line 101 in the antenna assembly 100, its line width setting will affect the signal transmission performance. After comprehensively considering factors such as the antenna mainboard size limit, transmission performance, cost, debugging difficulty and aesthetics, in some embodiments, the line width of the microstrip line 101 can be preferably set to 0.5 mm to achieve the best antenna transmission effect.

[0058] In addition, since the microstrip line 101 has an electromagnetic field distribution during signal transmission, especially at its corners, the electromagnetic field distribution will change. If a right-angle corner design is adopted, the current will suddenly change at the corner, which will lead to reflection, impedance mismatch, and additional electromagnetic radiation and interference, affecting the signal transmission quality. Therefore, in some embodiments, the shape of the corner of the microstrip line 101 can also be optimized to be a curved shape to smooth the current change, reduce electromagnetic radiation and interference, effectively control electromagnetic leakage and radiation interference in the high-frequency circuit, and maintain the stability and reliability of the radio frequency circuit.

[0059] Corresponding to the aforementioned embodiment of the main board with integrated antenna, the present specification also provides an embodiment of an entry scanner applied by the aforementioned main board with integrated antenna.

[0060] Figure 2 It is a schematic diagram of the internal structure of an entry-type scanner shown in this specification according to an exemplary embodiment.

[0061] like Figure 2 As shown, the entry scanner includes:

[0062] The mainboard with integrated antenna (the antenna assembly is not shown in the figure), the WiFi module 300 and the main control chip 400 described in any of the above embodiments, the WiFi module 300 is connected to the main control chip 400, and the WiFi module 300 and the main control chip 400 are both arranged on the mainboard 200;

[0063] The WiFi module 300 is also connected to the microstrip line 101 .

[0064] In the entry scanner, the WiFi module 300 is the main output module of the antenna signal. The antenna signal is output from the WiFi module 300 and transmitted to the patch inductor 102 and the patch capacitor 103 located in the antenna clearance area 201 through the microstrip line 101, and finally realizes the outward signal transmission. The efficiency of signal transmission depends to a large extent on the distance from the WiFi module 300 to the antenna clearance area 201. If this distance is too long, the signal may suffer severe attenuation during the transmission process, thereby reducing the final transmission efficiency. In order to reduce signal loss and improve transmission efficiency, in some embodiments, the WiFi module 300 can be preferably set at a position close to the antenna clearance area 201. However, at the same time, if the distance from the WiFi module 300 to the antenna clearance area 201 is too low, it may also cause serious performance deterioration.

[0065] Therefore, further considering the size limitation and performance requirements of the entry scanner, in some embodiments, the WiFi module 300 may be specifically set at a position greater than or equal to 3 mm and less than or equal to 10 mm away from the antenna clearance area.

[0066] In addition, in order to adapt to diverse usage requirements and scenarios, in some embodiments, the working frequency band of the WiFi module can be preferably set to a dual-band band of 2.4G and 5G to provide a wider compatibility and application range.

[0067] As for the main control chip 400, it is mainly used to control the start and stop of the WiFi module 300 or other devices in the scanner. In order to reduce the attenuation of the control signal, ensure the effect of the control signal, and achieve a compact design and reduce the size of the scanner, in some embodiments, the main control chip 400 can be preferably set near the WiFi module 300.

[0068] Likewise, considering the size limitation of the entry scanner, in some embodiments, the main control chip 400 may be disposed within 10 mm of the WiFi module.

[0069] In addition, since the main control chip 400 may radiate clutter outwards and affect the transmission of antenna signals, in some embodiments, the main control chip 400 may be set at a position away from the edge of the main board 200 to avoid interference with signal transmission. Specifically, considering the size limit of the entry scanner, the main control chip 400 may be set at a position more than 10 mm away from the edge of the main board 200. Of course, the position of the main control chip 400 from the edge of the main board can also be adjusted according to the specific layout design of the device.

[0070] If possible, the main control chip 400 should not be placed between the WiFi module 300 and the antenna assembly 100 to avoid the signal circulating between the main control chip 400 and the WiFi module 300 and affecting the antenna signal transmission.

[0071] Figure 3 It is a schematic diagram of the internal structure of another entry-type scanner shown in this specification according to an exemplary embodiment.

[0072] like Figure 3 As shown, when the entry scanner is in normal use, it may also include a battery 600 and a battery compartment 500. The battery 600 is arranged inside the battery compartment 500 to provide power for various devices in the scanner. However, both the battery 600 and the battery compartment 500 are large-area metal devices, which may interfere with the antenna signal, so they should be avoided as much as possible when designing the antenna. Therefore, the metal part of the battery compartment 500 away from the antenna clearance area 201 can be hollowed out, and the horizontal and vertical distances of the hollowed-out area from the antenna clearance area 201 are set to be no less than 3mm, and the vertical distance between the battery 600 and the antenna clearance area 201 is greater than or equal to 5mm, so as to maximize the distance between the antenna and the battery compartment 500, thereby reducing the possibility of interference.

[0073] also, Figure 4 FIG. 1 is a schematic diagram of the internal structure of another inlet type scanner according to an exemplary embodiment of the present specification. Figure 4 As shown, the entry scanner may also include various scanning components 700 for performing scanning work, such as cameras, fans, light sources, etc., and most of these scanning components contain metal materials. Therefore, similarly, in order to avoid interference with the antenna transmission signal, the distance between the scanning component and the antenna clearance area 201 can be optimized to be greater than or equal to 3 mm to prevent interference as much as possible.

[0074] Figure 5 It is a schematic diagram of the external overall structure of an entry-type scanner according to an exemplary embodiment of the present specification. The mainboard with integrated antenna described in the above embodiment is arranged inside the entry-type scanner.

[0075] Those skilled in the art will readily appreciate other embodiments of the specification after considering the specification and practicing the utility model claimed herein. The specification is intended to cover any variations, uses or adaptations of the specification that follow the general principles of the specification and include common knowledge or customary techniques in the art that are not claimed in the specification. The specification and examples are to be considered exemplary only, and the true scope and spirit of the specification are indicated by the following claims.

[0076] It should be understood that the present description is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present description is limited only by the appended claims.

[0077] The above description is only a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this specification should be included in the scope of protection of this specification.

Claims

1. A motherboard with an integrated antenna, characterized in that: comprising at least one antenna assembly and a mainboard, wherein the antenna assembly is integrated on the mainboard; The mainboard includes at least one antenna clearance area, each antenna assembly is arranged at the edge of an antenna clearance area, the antenna clearance area is arranged at the end of the mainboard, and the antenna clearance area is an area that does not contain any metal material; The antenna assembly includes a microstrip line, a patch capacitor and a patch inductor, and the microstrip line is sequentially connected to the patch inductor, the patch capacitor and the ground terminal of the mainboard; The chip capacitor is used to adjust the resonant frequency of the antenna; the chip inductor is used to adjust the impedance matching of the antenna.

2. The mainboard according to claim 1, characterized in that: The number of the antenna clearance areas is 2, and the two antenna clearance areas are symmetrically arranged at the ends of the mainboard; each antenna component is arranged at the edge of an antenna clearance area.

3. The mainboard according to claim 2, characterized in that: The area of ​​each antenna clearance area is greater than or equal to 75 mm 2 , the distance between the two antenna clearance areas is greater than or equal to 5 mm and less than or equal to 15 mm.

4. The mainboard according to claim 2, characterized in that: The patch inductors and the patch capacitors are arranged at equal intervals along the long side of the antenna clearance area.

5. The mainboard according to claim 2, characterized in that: Each of the antenna components includes a chip inductor and three chip capacitors, and the capacitance value of the chip capacitors is greater than or equal to 0.5 pF and less than or equal to 5 pF.

6. The mainboard according to any one of claims 1 to 5, characterized in that: The corners of the microstrip line are curved.

7. An entry scanner, characterized in that: The mainboard, WiFi module and main control chip comprise any one of claims 1 to 6, wherein the WiFi module is connected to the main control chip, and the WiFi module and the main control chip are both arranged on the mainboard; The WiFi module is also connected to the microstrip line.

8. The portal scanner according to claim 7, characterized in that: The working frequency band of the WiFi module is a dual-band band of 2.4G and 5G; The WiFi module is arranged at a position close to the antenna clearance area; The main control chip is arranged near the WiFi module; The main control chip is arranged at a position away from the edge of the main board.

9. The portal scanner according to claim 7, characterized in that: The WiFi module is arranged at a position which is greater than or equal to 3 mm and less than or equal to 10 mm away from the antenna clearance area; The main control chip is arranged within 10 mm from the WiFi module and more than 10 mm from the edge of the mainboard.

10. The portal scanner according to claim 7, characterized in that: Also includes: A battery compartment, the battery compartment is arranged below the main board; The metal portion of the battery compartment away from the antenna clearance area is hollowed out, and the horizontal and vertical distances between the hollowed-out area and the antenna clearance area are not less than 3 mm.

11. The portal scanner according to claim 10, characterized in that: Also includes: A battery is arranged inside the battery compartment, and a vertical distance between the battery and the antenna clearance area is greater than or equal to 5 mm.

12. The portal scanner according to claim 7, characterized in that: Also includes: A scanning component, which is arranged on the main board and connected to the main control chip; The distance between the scanning component and the antenna component is greater than or equal to 3 mm.

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