4g band fpc antenna and terminal device

Abstract

The embodiment of the present specification provides a 4G frequency band FPC antenna and a terminal device, and relates to the technical field of wireless communication. The FPC antenna comprises a circuit board body, an antenna assembly is arranged on the circuit board body, the antenna assembly comprises a radiation branch and a ground branch; the radiation branch is provided with an antenna feed point, the radiation branch comprises a first radiation branch and a second radiation branch, the first radiation branch is in the shape of L, the second radiation branch is in the shape of C, one end of the second radiation branch is connected to the middle part of the first radiation branch, and the second radiation branch is arranged at intervals around the first radiation branch; the ground branch is provided with an antenna feed point, the ground branch is arranged at intervals with the radiation branch, and part of the ground branch is arranged side by side to generate coupling, so that the antenna efficiency of the FPC antenna can be improved.

Description

Technical Field

[0001] The embodiments described in this specification relate to the field of wireless communication technology, specifically to a 4G band FPC antenna and terminal device. Background Technology

[0002] With the rapid development of wireless communication and the Internet of Things (IoT) industry, terminal devices are trending towards lighter, thinner, and smaller designs. To enhance product competitiveness and strictly control manufacturing costs, major manufacturers have a strong need to reduce antenna prices. Achieving high-performance antennas while meeting cost constraints and limiting the internal space available for antennas presents a significant challenge to antenna research and development. Utility Model Content

[0003] In view of this, this specification provides several embodiments of a 4G band FPC antenna and terminal device to improve antenna efficiency.

[0004] This specification provides a 4G band FPC antenna, which includes a circuit board body on which an antenna assembly is disposed. The antenna assembly includes radiating stubs and grounding stubs. The radiating stubs are provided with antenna feed points and include a first radiating stub and a second radiating stub. The first radiating stub is L-shaped and the second radiating stub is C-shaped. One end of the second radiating stub is connected to the middle of the first radiating stub, and the second radiating stubs are spaced around the first radiating stub. The grounding stub is provided with antenna feed points and is spaced apart from the radiating stubs, and is partially side-by-side to generate coupling.

[0005] In some embodiments, the first radiating stub includes a third and a fourth radiating stub connected in an L-shape; the antenna feed point is located at the end of the third radiating stub that is not connected to the fourth radiating stub; the second radiating stub includes a fifth, a sixth, and a seventh radiating stub connected in sequence; the end of the fifth or seventh radiating stub that is not connected to the sixth radiating stub is connected to the connection point between the third and fourth radiating stubs; the second radiating stub is arranged around the fourth radiating stub.

[0006] In some embodiments, the grounding stub includes a first grounding stub and a second grounding stub connected in an L-shape in sequence; the antenna feed point is located at the end of the first grounding stub that is not connected to the second grounding stub.

[0007] In some embodiments, the third and fourth radiating branches are at 90°, the fifth and sixth radiating branches are at 90°, the sixth and seventh radiating branches are at 90°, and the first grounding branch is at 90° to the second grounding branch.

[0008] In some embodiments, the first grounding branch is spaced apart from the third radiating branch in a manner that is at least partially parallel and adjacent to it, and the second grounding branch is spaced apart from the seventh radiating branch in a manner that is at least partially parallel and adjacent to it.

[0009] In some embodiments, the distance between the second grounding branch and the seventh radiating branch is greater than the distance between the first grounding branch and the third radiating branch.

[0010] In some embodiments, the FPC antenna includes an antenna outline, and the antenna assembly is disposed within the antenna outline; the antenna outline is convex to fit the inner wall of the housing of the mounted terminal device.

[0011] In some embodiments, the fourth, fifth, and sixth radiating stubs of the antenna assembly are located in or near the upper small region of the antenna profile, and the third and seventh radiating stubs of the antenna assembly are located in or near the lower large region of the antenna profile.

[0012] In some embodiments, the antenna feed point and the antenna feed location are used to connect the antenna assembly to the π-type matching network; the π-type matching network includes a wireless module, which is connected to the antenna feed point and the antenna feed location via a serial point, the serial point using a 0Ω resistor; a grounded first parallel point is provided between the wireless module and the serial point, the first parallel point not having any device attached; a grounded second parallel point is provided between the serial point and the antenna assembly, the second parallel point not having any device attached.

[0013] This specification provides a terminal device, which includes the FPC antenna described in any of the above embodiments.

[0014] In several embodiments provided in this specification, the FPC antenna includes a circuit board body, on which an antenna assembly is disposed. The antenna assembly includes radiating stubs and grounding stubs. The radiating stubs are provided with antenna feed points and include a first radiating stub and a second radiating stub. The first radiating stub is L-shaped, and the second radiating stub is C-shaped. One end of the second radiating stub is connected to the middle of the first radiating stub, and the second radiating stubs are spaced around the first radiating stubs. The grounding stubs are provided with antenna feed points and are spaced apart from the radiating stubs, and are partially side by side to generate coupling. In this way, the antenna efficiency of the FPC antenna can be improved. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of an FPC antenna provided for an embodiment of this specification; Figure 2 Another structural schematic diagram of the FPC antenna provided for the embodiments of this specification; Figure 3 Another schematic diagram of the FPC antenna provided for the embodiments of this specification; Figure 4 A schematic diagram of the π-type matching network provided for the embodiments of this specification; Figure 5 A schematic diagram of the voltage standing wave ratio of the FPC antenna provided for the embodiments of this specification; Figure 6 Efficiency test diagram of the FPC antenna provided for the embodiments of this specification; The labels in the accompanying drawings are explained as follows: 100 - Radiating stub; 200 - Grounding stub; 300 - Antenna feed point; 400 - Antenna feed location; 110 - First radiating stub; 120 - Second radiating stub; 111 - Third radiating stub; 112 - Fourth radiating stub; 121 - Fifth radiating stub; 122 - Sixth radiating stub; 123 - Seventh radiating stub; 210 - First grounding stub; 220 - Second grounding stub; 500 - Antenna outline. Detailed Implementation

[0016] To enable those skilled in the art to better understand the solutions described in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this specification.

[0017] With the booming development of the wireless communication industry, the Internet of Things (IoT) industry has also ushered in a technological leap. The application areas of IoT cover all aspects of life. In infrastructure fields such as industry, agriculture, environment, transportation, logistics, and security, its application has effectively promoted the intelligent development of these areas, enabling more rational use and allocation of limited resources, thereby improving industry efficiency and effectiveness. In sectors closely related to daily life, such as home, healthcare, education, finance and services, and tourism, its application has brought significant improvements in service scope, methods, and quality, greatly enhancing people's quality of life. In the field of national defense and military, although still in the research and exploration stage, the impact of IoT applications cannot be underestimated. From large-scale equipment systems such as satellites, missiles, aircraft, and submarines to individual soldier combat equipment, the embedding of IoT technology has effectively improved military intelligence, informatization, and precision, greatly enhancing military combat capabilities and becoming a key to future military transformation.

[0018] In wireless communication systems and IoT products, the device used to radiate and receive radio waves is called an antenna. Like transmitters and receivers, antennas are an important component of wireless equipment. An antenna is a transducer that converts guided electromagnetic waves on a transmission line into electromagnetic waves propagating in the air. Essentially, an antenna can be used for both transmitting and receiving, exhibiting reciprocity. Currently, the antenna performance of IoT products is limited by two factors: first, as IoT devices become smaller, the electromagnetic environment for antennas becomes more restrictive and complex; second, the performance requirements for antennas in IoT devices are gradually increasing, with some devices requiring operator certification (such as AT&T and T-Mobile).

[0019] In related technologies, 4G antennas are typically used in fourth-generation mobile communication systems (4G / LTE), and their operating frequency bands can include multiple ranges, primarily 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz, 2300MHz, and 2600MHz. These frequency bands can be broadly divided into low-frequency, mid-frequency, and high-frequency bands. Low-frequency bands (e.g., 700MHz, 800MHz, 900MHz): offer long propagation distances and strong penetration capabilities, suitable for rural and suburban coverage. Mid-frequency bands (e.g., 1800MHz, 1900MHz, 2100MHz): strike a balance between coverage and capacity, suitable for urban areas. High-frequency bands (e.g., 2300MHz, 2600MHz): provide higher data transmission rates but have smaller coverage areas, making them more suitable for densely populated urban areas. The commonly used 4G frequency bands may vary between different countries and regions, depending on local spectrum allocation.

[0020] In some related technologies, the reference ground of antennas in 4G frequency bands such as 824-960MHz and 1710-2690MHz is relatively long, resulting in low antenna efficiency.

[0021] This specification provides a 4G band flexible printed circuit board (FPC) antenna. The FPC antenna includes a circuit board body, on which an antenna assembly is disposed. Please refer to [link to documentation]. Figure 1 The antenna assembly includes a radiating stub 100 and a grounding stub 200.

[0022] The radiating stub 100 is provided with an antenna feed point 300. The radiating stub 100 includes a first radiating stub 110 and a second radiating stub 120. The first radiating stub 110 is L-shaped and the second radiating stub 120 is C-shaped. One end of the second radiating stub 120 is connected to the middle of the first radiating stub 110, and the second radiating stub 120 is arranged at intervals around the first radiating stub 110.

[0023] The grounding stub 200 is provided with an antenna feed point 400. The grounding stub 200 and the radiating stub 100 are spaced apart and partially side by side to generate coupling.

[0024] Among them, antenna feed point 300 and antenna feed point 400 are respectively set metal copper leakage areas.

[0025] In some implementations, please refer to [the relevant documentation]. Figure 1 The first radiating stub 110 includes a third radiating stub 111 and a fourth radiating stub 112 connected in an L-shape; the antenna feed point 300 is located at the end of the third radiating stub 111 that is not connected to the fourth radiating stub 112.

[0026] In some implementations, please refer to [the relevant documentation]. Figure 1 The second radiating branch 120 includes a fifth radiating branch 121, a sixth radiating branch 122, and a seventh radiating branch 123 connected sequentially; the end of the fifth radiating branch 121 or the seventh radiating branch 123 that is not connected to the sixth radiating branch 122 is connected to the connection point between the third radiating branch 111 and the fourth radiating branch 112. The second radiating branches 120 are spaced around the fourth radiating branch 112.

[0027] As an example, please continue reading Figure 1The end of the fifth radial branch 121 that is not connected to the sixth radial branch 122 is connected to the connection point between the third radial branch 111 and the fourth radial branch 112. The other end of the fifth radial branch 121 is connected to one end of the sixth radial branch 122. That is, the second radial branch 120 is connected to the outside of the L-shaped first radial branch 110 through the fifth radial branch 121, specifically to the outside of the connection point between the third radial branch 111 and the fourth radial branch 112.

[0028] As another example, the end of the seventh radial branch 123 that is not connected to the sixth radial branch 122 is connected to the connection point between the third radial branch 111 and the fourth radial branch 112. The other end of the seventh radial branch 123 is connected to one end of the sixth radial branch 122. That is, the second radial branch 120 is connected to the inside of the L-shaped first radial branch 110 through the seventh radial branch 123, specifically to the inside of the connection point between the third radial branch 111 and the fourth radial branch 112.

[0029] In some implementations, please refer to [the relevant documentation]. Figure 1 The grounding stub 200 includes a first grounding stub 210 and a second grounding stub 220 connected in an L-shape; the antenna feed point 400 is located at the end of the first grounding stub 210 that is not connected to the second grounding stub 220.

[0030] In some implementations, please refer to [the relevant documentation]. Figure 1 The third and fourth radiating branches 111 and 112 are at 90°, the fifth and sixth radiating branches 121 and 122 are at 90°, and the sixth and seventh radiating branches 122 and 123 are at 90°. The first grounding branch 210 and the second grounding branch 220 are at 90°.

[0031] In some implementations, please refer to [the relevant documentation]. Figure 1 The first grounding branch 210 and the third radiating branch 111 are at least partially parallel and adjacent to each other, and the second grounding branch 220 and the seventh radiating branch 123 are at least partially parallel and adjacent to each other.

[0032] In some implementations, please refer to [the relevant documentation]. Figure 1 The distance between the second grounding branch 220 and the seventh radiating branch 123 is greater than the distance between the first grounding branch 210 and the third radiating branch 111.

[0033] In some implementations, please refer to Figure 2The FPC antenna includes an antenna outline 500, within which antenna components are disposed. The antenna outline 500 is convex to fit the inner wall of the housing of the mounted terminal device. It is understood that, depending on the actual situation, for example, to accommodate the actual space size of the inner wall of the terminal device housing, the antenna outline 500 may also be of other shapes.

[0034] In some implementations, please refer to [the relevant documentation]. Figure 1 and Figure 2 The antenna outline 500, shaped like a convex character, includes a small area at the upper end and a large area at the lower end. The fourth radiating stub 112, the fifth radiating stub 121, and the sixth radiating stub 122 of the antenna assembly are located in or near the small area of ​​the antenna outline 500, which is used to adapt to or conform to the top or rounded corner joint of the housing of the terminal device. The third radiating stub 111 and the seventh radiating stub 123 of the antenna assembly are located in or near the large area of ​​the antenna outline 500, which can conform to the inner wall of the housing of the terminal device.

[0035] In some implementations, please refer to Figure 3 Please see Figure 3 The antenna assembly size, or antenna outline dimensions, can be 30.8*23.5 mm with an error of ±0.2 mm. The minimum required PCBA size is 35.8*28.7 mm. This allows for excellent antenna performance with only a small clearance area. Furthermore, the shorter reference ground and smaller antenna area reduce antenna cost. Thus, antenna performance can be improved while reducing antenna cost and overall system size, achieving superior antenna performance with only a small antenna area, antenna clearance, and short PCBA board length.

[0036] In some implementations, the antenna feed point and antenna feed location are used to connect the antenna assembly to the π-type matching network.

[0037] Please see Figure 4 The π-type matching network may include a wireless module, which is connected to the antenna feed point 300 and the antenna feed point 400 of the antenna assembly via a serial point, which uses a 0Ω resistor.

[0038] Specifically, a grounded first parallel contact is provided between the wireless module and the serial contact point. No device is attached to the first parallel contact point, which is normally closed (NC), indicating that it is empty, unconnected, and not soldered.

[0039] Specifically, a grounded second parallel contact NC is provided between the serial contact point and the antenna assembly. The second parallel contact point is not attached to any device, that is, it is a normally closed contact, indicating that it is empty, unconnected, and not soldered.

[0040] This specification provides a terminal device, which includes the FPC antenna described in any of the above embodiments. The antenna assembly is mounted on the inner wall of the terminal device housing using adhesive on the back of the circuit board body.

[0041] For example, please refer to Figure 5 , Figure 5 This is a schematic diagram of the voltage standing wave ratio (VSWR) of the embodiments described in this specification. In the VSWR diagram, the horizontal axis is the frequency (MHz) and the vertical axis is the VSWR. The VSWR for 824-960MHz is 3.1-4.6 and the VSWR for 1710-2690MHz is 1.1-4.7.

[0042] For example, please refer to Figure 6 , Figure 6 This diagram illustrates the passive efficiency test of the antenna according to the embodiments described in this specification. The horizontal axis represents frequency (MHz), and the vertical axis represents antenna efficiency (in %). The efficiency for 824-960MHz is 26.7%-41.4%, and the efficiency for 1710-2690MHz is 38.2%-69.0%.

[0043] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments described herein, and are not intended to limit the scope of this utility model.

[0044] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the implementation methods in this specification are not limited in this respect.

[0045] Unless otherwise stated, all technical and scientific terms used in the embodiments of this specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0046] The above description is merely a specific embodiment of this specification, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this specification should be included within the protection scope of this specification. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A 4G band FPC antenna, characterized in that, The FPC antenna includes a circuit board body, on which an antenna assembly is disposed, and the antenna assembly includes a radiating stub and a grounding stub. The radiating stub is provided with an antenna feed point. The radiating stub includes a first radiating stub and a second radiating stub. The first radiating stub is L-shaped and the second radiating stub is C-shaped. One end of the second radiating stub is connected to the middle of the first radiating stub, and the second radiating stub is arranged at intervals around the first radiating stub. The grounding stub is provided with an antenna feed point. The grounding stub and the radiating stub are spaced apart and partially side by side to generate coupling.

2. The FPC antenna according to claim 1, characterized in that, The first radiating stub includes a third radiating stub and a fourth radiating stub connected in an L-shape in sequence; the antenna feed point is located at the end of the third radiating stub that is not connected to the fourth radiating stub. The second radial branch includes a fifth radial branch, a sixth radial branch, and a seventh radial branch connected in sequence; The end of the fifth or seventh radial branch that is not connected to the sixth radial branch is connected to the connection point between the third and fourth radial branches. The second radiating branch is arranged around the fourth radiating branch.

3. The FPC antenna according to claim 2, characterized in that, The grounding branch includes a first grounding branch and a second grounding branch connected in an L-shape in sequence; the antenna feed point is located at the end of the first grounding branch that is not connected to the second grounding branch.

4. The FPC antenna according to claim 3, characterized in that, The third and fourth radiating branches are at 90°, the fifth and sixth radiating branches are at 90°, and the sixth and seventh radiating branches are at 90°. The first grounding branch is at a 90° angle to the second grounding branch.

5. The FPC antenna according to claim 3, characterized in that, The first grounding branch and the third radiating branch are arranged at least partially parallel and adjacent to each other at a distance, and the second grounding branch and the seventh radiating branch are arranged at least partially parallel and adjacent to each other at a distance.

6. The FPC antenna according to claim 3, characterized in that, The distance between the second grounding branch and the seventh radiating branch is greater than the distance between the first grounding branch and the third radiating branch.

7. The FPC antenna according to claim 2, characterized in that, The FPC antenna includes an antenna outline, and the antenna assembly is disposed within the antenna outline; the antenna outline is convex in shape to fit the inner wall of the housing of the installed terminal device.

8. The FPC antenna according to claim 7, characterized in that, The fourth, fifth, and sixth radiating stubs in the antenna assembly are located in or near the upper small region of the antenna outline, while the third and seventh radiating stubs in the antenna assembly are located in or near the lower large region of the antenna outline.

9. The FPC antenna according to claim 1, characterized in that, The antenna feed point and the antenna feed location are used to connect the antenna assembly to the π-type matching network; The π-type matching network includes a wireless module, which is connected to the antenna feed point and the antenna feed point through a serial point, and the serial point uses a 0Ω resistor; A grounded first parallel point is provided between the wireless module and the serial point, and no device is attached to the first parallel point. A grounded second parallel point is provided between the serial point and the antenna assembly, and no device is attached to the second parallel point.

10. A terminal device, characterized in that, The terminal device includes the FPC antenna as described in any one of claims 1 to 9.

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