Metal frame antenna system of low frequency band can be integrated

Abstract

The application provides a metal frame antenna system capable of integrating low frequency bands, which effectively increases the electric length of antenna radiation by using a closed metal ring and a metal chain connected to the closed metal ring of an electronic device itself, and combining a low-frequency excitation source loaded between a mainboard and the closed metal ring, excites a low-frequency special-shaped dipole mode, realizes the transmission and reception of low frequency bands in the metal frame antenna system, and adjusts the frequency band and bandwidth of the low frequency by adjusting the positional relationship between the connection point of the low-frequency excitation source and the metal chain and / or the length of the metal chain, thereby widening the low frequency band of the metal frame antenna system while ensuring the aesthetic degree, and realizing the integration of low frequency and high frequency; in addition, other high-frequency excitation sources can be loaded between the mainboard and the closed metal ring according to needs in addition to the low-frequency excitation source, thereby further improving the integration degree of the antenna.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a metal frame antenna system capable of integrating low-frequency bands. Background Technology

[0002] With the development and widespread adoption of mobile consumer smart terminals and other devices, people's demands for electronic products are also increasing. Besides more functions, stylish appearance has become a hot trend. Metal frames, with their aesthetic appeal, sturdiness, and comfortable feel, have become a mainstream design choice. However, metal frames can shield electromagnetic signals, posing a significant challenge to antenna design. Therefore, how to integrate metal frames with antenna design has become an important research direction in antenna technology.

[0003] In current technology, incorporating the metal frame as part of the antenna design is the mainstream design approach in the market. For example, in mobile phones with metal frames, multiple antennas are implemented by adding multiple breaks in the metal frame. This is often combined with switching components to expand bandwidth and achieve multi-band antenna design. However, this approach disrupts the continuity of the metal frame, affecting the overall aesthetics of the phone. Furthermore, when a hand or other conductor grips the breaks in the frame, the antenna performance deteriorates drastically, resulting in poor signal transmission and reception. Another example is smartwatches with metal frames. While a seamless metal frame can maximize the overall aesthetics of the watch, its size limitation restricts its use to designs for high-frequency antennas such as GNSS, Wi-Fi, and Bluetooth. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an integrable low-frequency metal frame antenna system to solve the problems of aesthetics and antenna performance degradation caused by the design of metal frame antennas that integrates multiple antennas by setting breakpoints, while the breakpoint-free method cannot achieve low-frequency antenna integration.

[0005] To achieve the above and other related objectives, the present invention provides an integrable low-frequency band metal frame antenna system, the metal frame antenna system comprising: a main board, a seamless closed metal ring, one or two metal chains, and at least one excitation source; wherein,

[0006] The motherboard is located inside the closed metal ring and is spaced apart from the closed metal ring;

[0007] All the metal chains are connected to the outside of the closed metal ring, and there are one or two connection points between all the metal chains and the closed metal ring;

[0008] All of the excitation sources are loaded between the motherboard and the closed metal ring, and one of the excitation sources is a low-frequency excitation source.

[0009] Optionally, the gap between the motherboard and the closed metal ring is greater than 2 mm.

[0010] Optionally, the metal chain and the closed metal ring are connected by an electrical connection or a non-electrical connection.

[0011] Optionally, the metal chain is coated with a medium material.

[0012] Optionally, the metal frame antenna system includes one metal chain, with both ends of the metal chain connected to the outside of the closed metal ring; or the metal frame antenna system includes two metal chains, with one end of each of the two metal chains connected to the outside of the closed metal ring; or the metal frame antenna system includes one metal chain, with one end of the metal chain connected to the outside of the closed metal ring.

[0013] Furthermore, the metal frame antenna system includes one metal chain, one end of which is connected to the outside of the closed metal ring, and the length of the metal chain is no greater than 150 mm; or the metal frame antenna system includes two metal chains, one end of which is connected to the outside of the closed metal ring, and the length of each metal chain is no greater than 150 mm; or the metal frame antenna system includes one metal chain, both ends of which are connected to the outside of the closed metal ring, and the length of the metal chain is no greater than 300 mm.

[0014] Optionally, the circumferential angle between the low-frequency excitation source and all the connection points relative to the center of the closed metal ring is 30° to 330°.

[0015] Furthermore, the circumferential angle between the low-frequency excitation source and all the connection points relative to the center of the closed metal ring is 150°~210°.

[0016] Furthermore, the metal frame antenna system includes one of the excitation sources, and the excitation source is the low-frequency excitation source; the metal frame antenna system also includes a grounding structure, which is electrically connected between the motherboard and the closed metal ring.

[0017] Furthermore, the grounding structure is in the form of a screw lock or a metal spring.

[0018] Optionally, the metal frame antenna system includes at least two excitation sources, one of which is a low-frequency excitation source, and the other excitation sources are high-frequency excitation sources.

[0019] Furthermore, all of the aforementioned excitation sources are non-synchronous excitation sources.

[0020] Optionally, the metal frame antenna system further includes a grounding structure electrically connected between the motherboard and the enclosed metal ring.

[0021] Optionally, the metal frame antenna system further includes at least two grounding structures, all of which are electrically connected between the motherboard and the closed metal ring, and the connection point of the low-frequency excitation source and all the metal chains along the circumference of the closed metal ring corresponds to the annular portion of the closed metal ring between two adjacent grounding structures.

[0022] Furthermore, two adjacent high-frequency excitations have the same frequency band, and a grounding structure is provided between them.

[0023] Optionally, the low-frequency excitation source and the adjacent high-frequency excitation source have the same frequency band, and a grounding structure is provided between them.

[0024] Optionally, the grounding structure may take the form of a screw lock or a metal spring.

[0025] Optionally, the motherboard may also be equipped with a patch antenna and / or a ceramic antenna.

[0026] Optionally, the excitation source may be in the form of direct excitation or coupled excitation.

[0027] Optionally, the closed metal ring is a closed circular ring, and the main board is circular.

[0028] As described above, the integrable low-frequency metal frame antenna system of the present invention utilizes the closed metal ring and the metal chain connected to the closed metal ring of the electronic device itself, and combines a low-frequency excitation source loaded between the motherboard and the closed metal ring, effectively increasing the electrical length of the antenna radiation, exciting low-frequency irregular dipole modes, and realizing low-frequency transmission and reception in the metal frame antenna system. The frequency band and bandwidth of the low frequency can be adjusted by adjusting the positional relationship between the connection point of the low-frequency excitation source and the metal chain and / or the length of the metal chain, thus widening the metal frame antenna system to the low-frequency band while ensuring aesthetics, and realizing the integration of low and high frequencies. In addition, besides the low-frequency excitation source, other high-frequency excitation sources can be loaded between the motherboard and the closed metal ring as needed to further improve the integration of the antenna. Attached Figure Description

[0029] Figure 1 , Figures 4 to 7 , Figures 9 to 13 , Figure 15 and Figure 16The diagram shown is a structural schematic of the metal frame antenna system for integrating low-frequency bands according to the present invention.

[0030] Figure 2 and Figure 3 The diagram shows a simulation of the current distribution at different locations on the motherboard and the closed metal ring when no grounding structure is provided in the integrable low-frequency band metal frame antenna system of the present invention.

[0031] Figure 2a Displayed as Figure 1 3D radiation pattern of low-frequency irregular dipole mode excited by a low-frequency excitation source in an integrable low-frequency band metal frame antenna system.

[0032] Figure 8 The diagram shown is a simulation of the current distribution on the motherboard and the closed metal ring with a low-frequency excitation source when a grounding structure is set in the integrable low-frequency band metal frame antenna system of the present invention.

[0033] Figure 14 The diagram shown is a simulation of the current distribution on the motherboard and the closed metal ring when the low-frequency excitation source and the connection points of all metal chains in the integrable low-frequency band metal frame antenna system of the present invention are located in the annular portion of the closed metal ring between two adjacent grounding structures.

[0034] Figure 14a Displayed as Figure 13 3D radiation pattern of low-frequency irregular dipole mode excited by a low-frequency excitation source in an integrable low-frequency band metal frame antenna system.

[0035] Figure 14b The diagram shown is a simulation of the current distribution of the low-frequency excitation source loaded on the motherboard and the closed metal ring in the integrable low-frequency band metal frame antenna system of the present invention, when the connection points of the low-frequency excitation source and all metal chains do not correspond to the annular portion of the closed metal ring between two adjacent grounding structures.

[0036] Figure 17 The diagram shown is a simulated return loss diagram of the LTE antenna in the integrable low-frequency band metal frame antenna system of Embodiment 1 of the present invention.

[0037] Figure 18 The diagram shown is a simulated return loss diagram of the GPS antenna in the integrable low-frequency band metal frame antenna system of Embodiment 1 of the present invention.

[0038] Figure 19 The diagram shown is a simulated return loss diagram of the UWB antenna in the integrable low-frequency metal frame antenna system of Embodiment 1 of the present invention.

[0039] Figure 20The diagram shown is a simulation isolation diagram between the LTE antenna, UWB antenna, and GPS antenna in the integrable low-frequency band metal frame antenna system of Embodiment 1 of the present invention.

[0040] Figure 21 The diagram shows the simulated antenna efficiency of the LTE antenna, UWB antenna, and GPS antenna in the integrable low-frequency band metal frame antenna system of Embodiment 1 of the present invention.

[0041] Figure 22 The diagram shown is a simulated return loss diagram of the Wi-Fi antenna in the integrable low-frequency band metal frame antenna system of Embodiment 2 of the present invention.

[0042] Figure 23 The diagram shown is a simulated return loss diagram of the LTE antenna in the metal frame antenna system that can be integrated into low-frequency bands according to Embodiment 2 of the present invention.

[0043] Figure 24 The diagram shown is a simulated return loss diagram of the UWB antenna in the integrable low-frequency metal frame antenna system of Embodiment 2 of the present invention.

[0044] Figure 25 The diagram shown is a simulation isolation diagram between the LTE antenna, UWB antenna, and Wi-Fi antenna in the integrable low-frequency band metal frame antenna system of Embodiment 2 of the present invention.

[0045] Figure 26 The diagram shows the simulated antenna efficiency of the LTE antenna, UWB antenna, and Wi-Fi antenna in the integrable low-frequency band metal frame antenna system of Embodiment 2 of the present invention.

[0046] Figure 27 The diagram shows the measured return loss of the 5G (FR1) / LTE antenna in the metal frame antenna system that can be integrated into low-frequency bands according to Embodiment 3 of the present invention.

[0047] Figure 28 The diagram shown is a measured return loss diagram of the GPS / BT antenna in the integrable low-frequency band metal frame antenna system of Embodiment 3 of the present invention.

[0048] Figure 29 The diagram shown is a measured return loss diagram of the BT antenna in the integrable low-frequency band metal frame antenna system of Embodiment 3 of the present invention.

[0049] Figure 30 The diagram shows the measured isolation between the 5G (FR1) / LTE antenna, GPS / BT antenna, and BT antenna in the integrable low-frequency band metal frame antenna system of Embodiment 3 of the present invention.

[0050] Figure 31The diagram shows the measured antenna efficiency of the 5G (FR1) / LTE antenna, GPS / BT antenna, and BT antenna in the integrable low-frequency band metal frame antenna system of Embodiment 3 of the present invention.

[0051] Component designation explanation

[0052] 10 motherboard 11 Closed metal ring 12 metal chain 120 Connection point 13 Motivation source 130 With low-frequency excitation source 131 First high-frequency excitation source 132 Second high-frequency excitation source 14 Grounding structure 15 Patch antenna 16 Ceramic antenna Detailed Implementation

[0053] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0054] Please see Figures 1 to 31 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0055] like Figures 1 to 16 As shown, this embodiment provides an integrable low-frequency band metal frame antenna system, which includes: a main board 10, a seamless closed metal ring 11, one or two metal chains 12, and at least one excitation source 13; wherein,

[0056] The motherboard 10 is located inside the closed metal ring 11 and is spaced apart from the closed metal ring 11;

[0057] All of the metal chains 12 are connected to the outside of the closed metal ring 11, and there are one or two connection points 120 between all the metal chains 12 and the closed metal ring 11.

[0058] All of the excitation sources 13 are loaded between the motherboard 10 and the closed metal ring 11, and one of the excitation sources 13 is a low-frequency excitation source 130.

[0059] It should be noted that the seamless closed metal ring 11 refers to a metal ring that extends circumferentially to form a complete circle, making it a closed ring without any breaks in the extension direction. Furthermore, the spacing between the motherboard 10 and the closed metal ring 11 refers to an electrical spacing; there is no direct electrical contact between them. Moreover, the low-frequency and high-frequency bands of the low-frequency excitation source 130 can be selected according to actual needs, without excessive restrictions, as long as the low-frequency excitation source 130 simultaneously provides both low-frequency and high-frequency excitation effects. Furthermore, the closed metal ring 11 and metal chain 12 in this embodiment are based on the metal ring and metal chain structures inherent in the electronic device itself. Since the focus of this embodiment is on the antenna system, the electronic device will not be described in detail. The antenna system of this embodiment is applicable to any electronic device with a closed metal ring, metal chain, and motherboard.

[0060] This embodiment of the integrable low-frequency metal frame antenna system utilizes the closed metal ring inherent in the electronic device and the metal chain connected to the closed metal ring, combined with a low-frequency excitation source loaded between the motherboard and the closed metal ring. This effectively increases the electrical length of the antenna radiation, excites low-frequency irregular dipole modes, and enables low-frequency transmission and reception in the metal frame antenna system. The low-frequency band and bandwidth can be adjusted by changing the positional relationship between the connection point of the low-frequency excitation source and the metal chain, and / or the length of the metal chain. This achieves the expansion of the metal frame antenna system to the low-frequency band while maintaining aesthetics, realizing the integration of low and high frequencies. In addition to the low-frequency excitation source, other high-frequency excitation sources can be loaded between the motherboard and the closed metal ring as needed to further improve the antenna integration.

[0061] The spacing between the motherboard 10 and the closed metal ring 11 is set according to actual needs, and preferably the spacing is greater than 2mm, including the stated value.

[0062] The connection method between the metal chain 12 and the closed metal ring 11 is not overly restricted. It can be an electrical connection, i.e., a direct contact connection, or a non-electrical connection, i.e., a connection through a dielectric material. When the connection method between the metal chain 12 and the closed metal ring 11 is a direct electrical connection, the electrical signal between the metal chain 12 and the closed metal ring 11 can be directly transmitted; when the connection method between the metal chain 12 and the closed metal ring 11 is a non-electrical connection, the electrical signal between the metal chain 12 and the closed metal ring 11 is transmitted through coupling. Therefore, a direct electrical connection between the metal chain 12 and the closed metal ring 11 is preferred.

[0063] The metal chain 12 can be designed to be directly exposed, or it can be covered with a dielectric material to conceal its direct exposure, depending on design requirements. The choice of dielectric material depends on the specific needs. The metal chain 12 serves as both a radiator and an external component of the intelligent electronic device. Therefore, the material and shape of the metal chain 12 should satisfy its function as an antenna radiator while also possessing aesthetic appeal. It can be similar to a conventional chain, exhibiting a variable shape for easy storage.

[0064] The number of metal chains 12 can be one or more. Considering that the metal chains 12 also serve as conventional appearance components, the number is generally not large. In this embodiment, one or two chains are preferred. For example, Figure 1 The metal chain 12 described herein is configured as two chains, such as... Figure 5 and Figure 6 The metal chain 12 described herein is configured as a single chain. For example... Figure 1 As shown, two metal chains 12 are provided, and one end of each metal chain 12 is connected to the outside of the closed metal ring 11; as Figure 5 As shown, a metal chain 12 is provided, and one end of the metal chain 12 is connected to the outside of the closed metal ring 11; as Figure 6 As shown, a metal chain 12 is provided, and the two ends of the metal chain 12 are connected to the outside of the closed metal ring 11.

[0065] Better, such as Figure 5 As shown, when the metal frame antenna system includes a metal chain 12, and one end of the metal chain 12 is connected to the outside of the closed metal ring 11, preferably the length of the metal chain 12 is no greater than 150mm, to facilitate effective excitation in the LTE / 5G low-frequency band; Figure 1 As shown, the metal frame antenna system includes two metal chains 12, and when one end of each metal chain 12 is connected to the outside of the closed metal ring 11, preferably the length of each metal chain 12 is no greater than 150mm, to facilitate effective excitation in the LTE / 5G low-frequency band; Figure 6 As shown, when the metal frame antenna system includes a metal chain 12, and both ends of the metal chain 12 are connected to the outside of the closed metal ring 11, it is preferable that the length of the metal chain 12 is no more than 300mm, so as to facilitate effective excitation of the LTE / 5G low frequency band.

[0066] The shapes of the enclosed metal ring 11 and the motherboard 10 are not excessively restricted; they can be selected according to actual design needs, for example... Figure 1 The closed metal ring 11 is selected to be a closed circular ring, and the main board 10 is selected to be circular; Figure 4The closed metal ring 11 is selected as a closed rectangle, and the main board 10 is selected as a rectangle.

[0067] The low-frequency excitation source 130 serves as the low-frequency excitation source in the integrable low-frequency metal frame antenna system of this embodiment. Its positional relationship with the connection point 120 between the metal chain 12 and the closed metal ring 11 affects the radiation efficiency of the low-frequency antenna. Research has shown that, in the case of only one low-frequency excitation source 130 and no grounding structure 14, the low-frequency excitation source 130 and the connection point 120 should not be too close. Here, the circumferential angle relative to the center of the closed metal ring 11, either clockwise or counterclockwise, is used as the standard for determining their proximity. Preferably, the circumferential angle between the low-frequency excitation source 130 and all the connection points 120 relative to the center of the closed metal ring 11 is 30°~330° to facilitate the excitation of low-frequency irregular dipole modes; more preferably, 150°~210° is selected. Figure 2 In this configuration, the distance between the low-frequency excitation source 130 and all the connection points 120 is approximately at its maximum, and the circumferential angle relative to the center of the closed metal ring 11 is close to 180°. At this point, the current generated by the low-frequency excitation source 130 between the motherboard 10 and the closed metal ring 11 exists in both the closed metal ring 11 region and the metal chain 12 region, and the current distribution is very uniform. Therefore, the low-frequency excitation source 130 can excite... Figure 2a Low-frequency irregular dipole modes in; such as Figure 3 In this configuration, the low-frequency excitation source 130 is very close to all the connection points 120, and the circumferential angle relative to the center of the closed metal ring 11 is less than 30° or greater than 330°. At this point, the low-frequency excitation source 130 loaded between the motherboard 10 and the closed metal ring 11 essentially only induces current in the region of the closed metal ring 11, while the current in the region of the metal chain 12 is very small and practically nonexistent. Therefore, the efficiency of the low-frequency signal is very low. It should be noted here that... Figure 2 and Figure 3 In the simulation diagram, different colors represent different current magnitudes, and the current strength is in the order of red > orange > green > blue. The following... Figure 8 , Figure 14 and Figure 14b The same representation is used in the simulation diagram.

[0068] To enhance the effect of low-frequency resonance, this can be achieved by setting up grounding structure 14, such as... Figure 7As shown, the metal frame antenna system includes an excitation source 13, which is the low-frequency excitation source 130. The metal frame antenna system also includes a grounding structure 14, which is electrically connected between the motherboard 10 and the enclosed metal ring 11. The electrical connection position of the grounding structure 14 between the motherboard 10 and the enclosed metal ring 11 is not excessively restricted; it can be selected according to actual needs. The grounding structure 14 can adopt any suitable existing structure, such as a screw, metal spring, etc. Figure 8 In the current simulation diagram, the grounding structure 14 is located on the left side of the low-frequency excitation source 130. The excitation current distribution is such that the current intensity is stronger on the right side of the grounding structure 14 and weaker on the left side, resulting in an uneven overall current distribution. However, this arrangement can enhance the low-frequency resonance effect, improve the low-frequency radiation efficiency, and obtain a wider low-frequency bandwidth.

[0069] To further improve the antenna integration of the integrable low-frequency metal frame antenna system in this embodiment, in addition to the low-frequency excitation source 130, the excitation source 13 can also add one or more high-frequency excitation sources. For example... Figure 9 In addition to the low-frequency excitation source 130, two high-frequency excitation sources are added: a first high-frequency excitation source 131 and a second high-frequency excitation source 132. To ensure better isolation between the three antennas, it is preferable that the low-frequency excitation source 130, the first high-frequency excitation source 131, and the second high-frequency excitation source 132 are non-co-frequency excitation sources. This allows for the effective integration of multiple non-co-frequency antennas without requiring a grounding structure to achieve better isolation.

[0070] As described above, the low-frequency resonance effect can be enhanced by setting a grounding structure 14, thereby improving low-frequency radiation efficiency and obtaining a wider low-frequency bandwidth. This theory also applies when at least one high-frequency excitation source is added. Furthermore, the grounding structure 14 can also improve the isolation between the low-frequency excitation source 130 and its adjacent high-frequency excitation source, especially when the low-frequency excitation source 130 and its adjacent high-frequency excitation source have the same frequency band, the isolation effect of the grounding structure is more obvious. For example, as... Figure 10 In the middle, a grounding structure 14 is provided between the low-frequency excitation source 130 located at the lower part and the first high-frequency excitation source 131 to the right of the low-frequency excitation source 130. This grounding structure 14 can enhance the low-frequency resonance effect and improve the isolation between the low-frequency excitation source 130 and the first high-frequency excitation source 131, thereby realizing the integration of two non-co-frequency antennas. Figure 11In the middle, a grounding structure 14 is provided between the low-frequency excitation source 130 located at the bottom and the first high-frequency excitation source 131 to the right of the low-frequency excitation source 130. This grounding structure 14 can enhance the low-frequency resonance effect and improve the isolation between the low-frequency excitation source 130 and the first high-frequency excitation source 131. There is also a second high-frequency excitation source 132 located to the left of the low-frequency excitation source 130. In the case of only one grounding structure 14, in order to ensure high isolation between the second high-frequency excitation source 132 and the first high-frequency excitation source 131, as well as high isolation between the second high-frequency excitation source 132 and the low-frequency excitation source 130, it is preferable that the second high-frequency excitation source 132 is not in the same frequency as the first high-frequency excitation source 131 and the low-frequency excitation source 130. More preferably, the second high-frequency excitation source 132 is located in the middle position between the first high-frequency excitation source 131 and the low-frequency excitation source 130, thereby realizing the integration of three non-co-frequency antennas.

[0071] When a grounding structure 14 is used to enhance the low-frequency resonance effect, thereby improving low-frequency radiation efficiency and obtaining a wider low-frequency bandwidth, at least one additional grounding structure 14 electrically connected between the motherboard 10 and the closed metal ring 11 is needed to improve the isolation between two adjacent excitation sources. This grounding structure 14 can also adopt any existing suitable structure, such as a screw, metal spring, etc. That is, when more than two grounding structures 14 need to be set, the connection point 120 of the low-frequency excitation source 130 and all the metal chains 12 must satisfy the following: along the circumference of the closed metal ring 11, the connection point 120 of the low-frequency excitation source 130 and all the metal chains 12 corresponds to the annular portion of the closed metal ring 11 between two adjacent grounding structures 14. This can be achieved through… Figure 14 The current distribution simulation diagram is used for illustration. Figure 14 In this configuration, the connection points 120 of the low-frequency excitation source 130 and all the metal chains 12 correspond to the annular portion of the closed metal ring 11 between two adjacent grounding structures 14. Only then can the low-frequency excitation source 130 excite current on the metal chains 12, thereby achieving low-frequency radiation. At this time, the low-frequency excitation source 130 can excite current such as... Figure 14a The low-frequency irregular dipole mode in, while Figure 14b In this case, the connection point 120 between the low-frequency excitation source 130 and all the metal chains 12 does not correspond to the annular portion of the closed metal ring 11 between two adjacent grounding structures 14. Instead, the low-frequency excitation source 130 is located outside this annular portion. In this case, the current excited by the low-frequency excitation source 130 is mainly distributed in the area outside this annular portion. That is to say, the low-frequency excitation source 130 can basically not excite current on the metal chain 12, thus failing to achieve low-frequency radiation.

[0072] As an example, when two adjacent high-frequency excitations have the same frequency band, a grounding structure 14 can be set between them to improve the isolation between them, such as... Figure 12 and Figure 13 In this configuration, the first high-frequency excitation source 131 and the second high-frequency excitation source 132 have the same frequency band, and a grounding structure 14 is provided between them to achieve high isolation between them.

[0073] As an example, when the low-frequency excitation source 130 and its adjacent high-frequency excitation source have the same frequency band, a grounding structure 14 can be provided between them to improve the isolation between them, such as... Figure 13 In this configuration, the first high-frequency excitation source 131 and the low-frequency excitation source 130 share the same frequency band, and a grounding structure 14 is provided between them. Similarly, the second high-frequency excitation source 132 and the low-frequency excitation source 130 share the same frequency band, and a grounding structure 14 is also provided between them. In this configuration, the two grounding structures 14, which are isolated from the low-frequency excitation source 130, not only improve the isolation between adjacent antennas but also serve as the starting point for low-frequency excitation. The principle can be explained by… Figure 14 illustrate.

[0074] As an example, a patch antenna 15 and / or a ceramic antenna 16 may also be further integrated on the motherboard 10. Figure 15 and Figure 16 As shown, Figure 16 The diagram shows a layout of an actual device. Patch antenna 15 and ceramic antenna 16 are further integrated on the motherboard 10 to further improve the integration of the entire antenna system.

[0075] As an example, in the metal frame antenna system that can be integrated into the low-frequency band in this embodiment, the excitation source 13 can be in the form of direct excitation or coupled excitation, depending on the actual needs.

[0076] The integrable low-frequency metal frame antenna system of the present invention will be described in detail and simulated and verified below with reference to specific accompanying drawings and corresponding examples. Obviously, the described examples are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] Example 1

[0078] This embodiment integrates three antennas: LTE antenna, GPS antenna, and UWB antenna. Figure 9This is a schematic diagram of the structure of the integrable low-frequency band metal frame antenna system of this embodiment. It includes: a circular main board 10, a seamless circular closed metal ring 11, two metal chains 12, and three excitation sources 13; wherein, the main board 10 is located inside the closed metal ring 11 and spaced apart from it; both metal chains 12 are connected to the outside of the closed metal ring 11, with one end of each chain connected to the closed metal ring 11, thus having two connection points 120; the three excitation sources 13 are loaded between the main board 10 and the closed metal ring 11, one of which is a low-frequency excitation source 130, and the other two are high-frequency excitation sources, namely a first high-frequency excitation source 131 and a second high-frequency excitation source 132. The low-frequency excitation source 130 is located... Approximately at the middle position of the lower semicircle of the horizontal diameter AA within the closed metal ring 11, the first high-frequency excitation source 131 and the second high-frequency excitation source 132 are located above the horizontal diameter AA and on both sides of the two metal chains 12; the low-frequency excitation source 130 is used to excite the LTE antenna, which can cover the 700MHz~2700MHz frequency band; the first high-frequency excitation source 131 is used to excite the GPS antenna, which can cover the 1570MHz~1580MHz frequency band; the second high-frequency excitation source 132 is used to excite the UWB antenna, which can cover the 6100MHz~8400MHz frequency band; the positions of the first high-frequency excitation source 131 and the second high-frequency excitation source 132 can be interchanged.

[0079] pass Figure 9 The antenna system's structure, combined with matching networks and filtering circuits, achieves the integrated design of three antennas: LTE antenna, GPS antenna, and UWB antenna, while maintaining acceptable isolation between the antennas. Figures 17 to 21 The simulated S-parameter plots (including return loss and isolation) and efficiency plots for the three antennas both meet the design expectations.

[0080] Example 2

[0081] This embodiment integrates three antennas: LTE antenna, Wi-Fi antenna, and UWB antenna. Figure 12This is a schematic diagram of the structure of the integrable low-frequency band metal frame antenna system of this embodiment. It includes: a circular main board 10, a seamless annular closed metal ring 11, two metal chains 12, two grounding structures 14, and three excitation sources 13. The main board 10 is located inside the closed metal ring 11 and spaced apart from it. Both metal chains 12 are connected to the outside of the closed metal ring 11, with one end of each chain connected to the closed metal ring 11, thus having two connection points 120. The three excitation sources 13 are loaded between the main board 10 and the closed metal ring 11. One excitation source 13 is a low-frequency excitation source 130, and the other two are high-frequency excitation sources, namely a first high-frequency excitation source 131 and a second high-frequency excitation source 132. The first high-frequency excitation source 131 is located approximately at the middle position of the lower semicircle of the horizontal diameter AA passing through the inside of the closed metal ring 11, and the second high-frequency excitation source 132 is located at the... The lower semicircle of the horizontal diameter AA inside the closed metal ring 11, near the right edge, has a low-frequency excitation source 130 located above the horizontal diameter AA and to the left of the two metal chains 12. A grounding structure 14 is located between the low-frequency excitation source 130 and the first high-frequency excitation source 131, and another grounding structure 14 is located between the first high-frequency excitation source 131 and the second high-frequency excitation source 132. The low-frequency excitation source 130 is used to excite the LTE antenna, covering the 700MHz~2700MHz frequency band. The first high-frequency excitation source 131 is used to excite the Wi-Fi antenna, covering the 2400MHz~2500MHz and 5150MHz~7125MHz frequency bands. The second high-frequency excitation source 132 is used to excite the UWB antenna, covering the 6100MHz~8400MHz frequency band.

[0082] pass Figure 12 The antenna system's structure, combined with matching networks and filtering circuits, achieves the integrated design of three antennas: LTE antenna, Wi-Fi antenna, and UWB antenna, while maintaining acceptable isolation between the antennas. Figures 22 to 26 The simulated S-parameter plots (including return loss and isolation) and efficiency plots for the three antennas both meet the design expectations.

[0083] Example 3

[0084] This embodiment integrates three antennas: 5G (FR1) / LTE antenna / GPS / BT antenna / BT antenna. Figure 16This is a schematic diagram of the physical structure of the integrable low-frequency band metal frame antenna system of this embodiment. It includes: a circular main board 10, a seamless circular annular closed metal ring 11, two metal chains 12, a grounding structure 14, and three excitation sources 13. The main board 10 is located inside the closed metal ring 11 and spaced apart from it. Both metal chains 12 are connected to the outside of the closed metal ring 11, with one end of each chain connected to the closed metal ring 11, thus having two connection points 120. One of the three excitation sources 13, a low-frequency excitation source 130, is loaded between the main board 10 and the closed metal ring 11, while the other two excitation sources are loaded on the main board 10. The low-frequency excitation source 130 is located horizontally on the closed metal ring 11. The diameter is located below the right edge; a grounding structure 14 is located below the horizontal diameter of the closed metal ring 11 near the left edge; a low-frequency excitation source 130 excites the 5G (FR1) / LTE antenna through a metal spring, with the operating frequency band covering the 600MHz~960MHz band and the 1710MHz~60000MHz band; the other two excitation sources are located in the following antennas: one is the FPC-type patch antenna 15 located on the left side of the upper semicircle of the motherboard 10, designed as a GPS / BT antenna; the other is the ceramic antenna 16 located on the right side of the upper semicircle of the motherboard 10, designed as a BT antenna.

[0085] pass Figure 16 The antenna system's structure, combined with matching networks and filtering circuits, achieves the integrated design of three antennas: a 5G (FR1) / LTE antenna, a GPS / BT antenna, and a BT antenna, while maintaining acceptable isolation between the antennas. Figures 27 to 31 The measured S-parameter plots (including return loss and isolation) and efficiency plots for the three antennas are shown, and both meet the design expectations.

[0086] In summary, this invention provides an integrable low-frequency metal-frame antenna system. By utilizing the closed metal ring inherent in the electronic device and the metal chain connected to the closed metal ring, combined with a low-frequency excitation source loaded between the motherboard and the closed metal ring, the electrical length of the antenna radiation is effectively increased, exciting low-frequency irregular dipole modes. This enables low-frequency transmission and reception in the metal-frame antenna system. Furthermore, the low-frequency band and bandwidth can be adjusted by changing the positional relationship between the connection point of the low-frequency excitation source and the metal chain, and / or the length of the metal chain. This achieves both aesthetic appeal and expansion of the metal-frame antenna system into the low-frequency band, realizing the integration of low and high frequencies. In addition to the low-frequency excitation source, other high-frequency excitation sources can be loaded between the motherboard and the closed metal ring as needed, further improving the antenna's integration. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial applicability.

[0087] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A metal frame antenna system capable of integrating low-frequency bands, characterized in that, The metal frame antenna system includes: a main board, a seamless closed metal ring, one or two metal chains, and at least one excitation source; wherein... The motherboard is located inside the closed metal ring and is spaced apart from the closed metal ring; All the metal chains are connected to the outside of the closed metal ring, and there are one or two connection points between all the metal chains and the closed metal ring; wherein, the connection between the metal chains and the closed metal ring is electrical or non-electrical, and the metal chains serve as antenna radiators; All of the excitation sources are loaded between the motherboard and the closed metal ring, and one of the excitation sources is a low-frequency excitation source, which has both low-frequency and high-frequency excitation effects.

2. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The gap between the motherboard and the closed metal ring is greater than 2mm.

3. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The metal chain is covered with a medium material.

4. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The metal frame antenna system includes one metal chain, with both ends of the metal chain connected to the outside of the closed metal ring; or the metal frame antenna system includes two metal chains, with one end of each of the two metal chains connected to the outside of the closed metal ring; or the metal frame antenna system includes one metal chain, with one end of the metal chain connected to the outside of the closed metal ring.

5. The integrable low-frequency band metal frame antenna system according to claim 4, characterized in that: The metal frame antenna system includes one metal chain, one end of which is connected to the outside of the closed metal ring, and the length of the metal chain is no greater than 150 mm; or the metal frame antenna system includes two metal chains, one end of which is connected to the outside of the closed metal ring, and the length of each metal chain is no greater than 150 mm; or the metal frame antenna system includes one metal chain, both ends of which are connected to the outside of the closed metal ring, and the length of the metal chain is no greater than 300 mm.

6. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The circumferential angle between the low-frequency excitation source and all the connection points relative to the center of the closed metal ring is 30°~330°.

7. The integrable low-frequency band metal frame antenna system according to claim 6, characterized in that: The circumferential angle between the low-frequency excitation source and all the connection points relative to the center of the closed metal ring is 150°~210°.

8. The integrable low-frequency band metal frame antenna system according to any one of claims 1 to 7, characterized in that: The metal frame antenna system includes one of the excitation sources, and the excitation source is the low-frequency excitation source; the metal frame antenna system also includes a grounding structure, which is electrically connected between the motherboard and the closed metal ring.

9. The integrable low-frequency band metal frame antenna system according to claim 8, characterized in that: The grounding structure is in the form of a screw or a metal spring.

10. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The metal frame antenna system includes at least two excitation sources, one of which is a low-frequency excitation source, and the other is a high-frequency excitation source.

11. The integrable low-frequency band metal frame antenna system according to claim 10, characterized in that: All of the excitation sources are non-synchronous excitation sources.

12. The integrable low-frequency band metal frame antenna system according to claim 10, characterized in that: The metal frame antenna system also includes a grounding structure electrically connected between the motherboard and the enclosed metal ring.

13. The integrable low-frequency band metal frame antenna system according to claim 10, characterized in that: The metal frame antenna system further includes at least two grounding structures, all of which are electrically connected between the motherboard and the closed metal ring, and the connection point of the low-frequency excitation source and all the metal chains along the circumference of the closed metal ring corresponds to the annular portion of the closed metal ring between two adjacent grounding structures.

14. The integrable low-frequency band metal frame antenna system according to claim 13, characterized in that: Two adjacent high-frequency excitation sources have the same frequency band, and a grounding structure is provided between them.

15. The integrable low-frequency band metal frame antenna system according to claim 13 or 14, characterized in that: The low-frequency excitation source and the adjacent high-frequency excitation source have the same frequency band, and a grounding structure is provided between them.

16. The integrable low-frequency band metal frame antenna system according to claim 12 or 13, characterized in that: The grounding structure is in the form of a screw or a metal spring.

17. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The motherboard is also equipped with a patch antenna and / or a ceramic antenna.

18. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The incentive source can be either a direct incentive or a coupled incentive.

19. The integrable low-frequency band metal frame antenna system according to claim 1, characterized in that: The closed metal ring is a closed circular ring, and the main board is circular.

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