Antenna structure and electronic device

Abstract

This disclosure relates to an antenna structure and an electronic device. The antenna structure includes: a ground layer; a dielectric substrate disposed on the surface of the ground layer; a feed line disposed within the dielectric substrate; and a radiator disposed on the surface of the dielectric substrate facing away from the ground layer. The radiator includes a radiating portion, a hollow region, a feed point, and a ground point spaced apart from the feed point. The radiating portion encloses the hollow region. The feed point and the ground point are both disposed within the radiating portion. The ground point is electrically connected to the ground layer, and the feed point is electrically connected to the feed line. The radiating portion includes a first radiating region and a second radiating region spaced apart from the first radiating region. The first radiating region radiates signals in a first frequency band, and the second radiating region radiates signals in a second frequency band. The first frequency band is distinct from the second frequency band, and both the first and second frequency bands belong to ultra-wideband frequency bands.

Description

Technical Field

[0001] This disclosure relates to the field of terminal technology, and in particular to an antenna structure and electronic device. Background Technology

[0002] In recent years, with the maturity of UWB technology solutions and the reduction in costs, and based on the accurate indoor positioning function of UWB technology, major manufacturers have tried to apply UWB antennas to the terminal devices that users need in their daily lives, such as mobile phones, in order to improve the shortcomings of current mobile phones in poor positioning in tunnels or indoors.

[0003] In one related technology, a rectangular radiator and a power divider feed structure can be used. A row of grounding vias is formed in the middle of the rectangular radiator as an isolation wall, dividing the radiator into two parts. The power divider feed structure is then used to adjust the power input to the two parts, achieving dual-frequency resonance in the UWB band. However, the power divider feed structure is highly susceptible to impedance mismatch due to manufacturing errors, which can affect radiation performance. Summary of the Invention

[0004] This disclosure provides an antenna structure and electronic device to address the shortcomings of related technologies.

[0005] According to a first aspect of the present disclosure, an antenna structure is provided, comprising:

[0006] Grounding layer;

[0007] A dielectric substrate, wherein the dielectric substrate is disposed on the surface of the ground layer;

[0008] A feed line is disposed within the dielectric substrate;

[0009] A radiator is disposed on the surface of the dielectric substrate away from the ground layer. The radiator includes a radiating part, a hollow region, a feed point, and a ground point spaced apart from the feed point. The radiating part surrounds the hollow region. The feed point and the ground point are both disposed on the radiating part. The ground point is conductive to the ground layer, and the feed point is electrically connected to the feed line.

[0010] The radiating part includes a first radiating area and a second radiating area spaced apart from the first radiating area. The first radiating area is used to radiate signals in a first frequency band, and the second radiating area is used to radiate signals in a second frequency band. The first frequency band is different from the second frequency band, and both the first frequency band and the second frequency band belong to the ultra-wideband frequency band.

[0011] Optionally, the frequency of the first frequency band is lower than the frequency of the second frequency band, the radiator is rectangular, the first radiation area and the second radiation area are respectively located at the corners of the radiating part, and the corners where the first radiation area is located and the corners where the second radiation area is located are adjacent to each other.

[0012] The feed point is located at the middle of the edge where the radiating part connects to the second radiating area and is far from the first radiating area, and the grounding point is located at the corner where it is focused on the second radiating area.

[0013] Optionally, the first radiation region and / or the second radiation region include a stepped portion for limiting the current path.

[0014] Optionally, the first radiation region and the second radiation region each include a stepped portion, the stepped portion being located on adjacent side edges of the radiation portion.

[0015] Optionally, the width of the edge of the radiating part located between the first radiating area and the second radiating area is smaller than the width of the opposite edge.

[0016] Optionally, the radiator has a length of 11.56 mm and a width of 9.35 mm, and the edge between the first radiating area and the second radiating area is set along the length direction of the radiating part.

[0017] Optionally, a protective layer is also included, which is disposed on the side of the dielectric substrate opposite to the ground layer and covers the radiator.

[0018] Optionally, the dielectric substrate includes a first dielectric substrate and a second dielectric substrate stacked together, the feed line is disposed between the first dielectric substrate and the second dielectric substrate, the radiator is disposed on the surface of the first dielectric substrate, the second dielectric substrate is connected to the ground layer, the first dielectric substrate includes a through hole, and the feed point and the feed line are connected through the through hole.

[0019] Optionally, the center frequency of the first frequency band is 6.5 GHz, and the center frequency of the second frequency band is 8 GHz.

[0020] According to a second aspect of the present disclosure, an electronic device is provided, including an antenna structure as described in any of the above embodiments.

[0021] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0022] As can be seen from the above embodiments, this disclosure forms a hollow area by hollowing out the middle region of the radiator. With the reasonable arrangement of the feed point and grounding point, the current path when the radiator radiates the first frequency band signal and the current path when radiating the second frequency band signal can be adjusted, so that the positions of the current strong point and the current weak point on the current path are different, thereby achieving the purpose of dual-frequency resonance of the radiator. Compared with the related technology, which sets a row of grounding through holes on the same radiator as an isolation wall and further uses a power distribution structure to achieve dual-frequency radiation, this disclosure can adjust the current path by adjusting the structure of the radiator. While achieving dual-frequency resonance, it avoids the isolation wall and power distribution structure in the related technology, simplifies the power distribution structure, and reduces the risk of impedance mismatch caused by the processing error of the power distribution structure.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0025] Figure 1 This is a schematic diagram of an antenna structure according to an exemplary embodiment.

[0026] Figure 2 yes Figure 1 A schematic diagram of the antenna structure disassembly.

[0027] Figure 3 yes Figure 1 A cross-sectional schematic diagram of the antenna structure.

[0028] Figure 4 yes Figure 1 A top view of the antenna structure.

[0029] Figure 5 This is an S-parameter graph of an antenna structure according to an exemplary embodiment.

[0030] Figure 6 This is an antenna efficiency curve illustrating an antenna structure according to an exemplary embodiment.

[0031] Figure 7 This is a far-field radiation diagram of an antenna structure at 6.5 GHz, according to an exemplary embodiment.

[0032] Figure 8 This is an electric field distribution diagram of an antenna structure at 6.5 GHz, according to an exemplary embodiment.

[0033] Figure 9 This is a current distribution diagram of an antenna structure at 6.5 GHz, according to an exemplary embodiment.

[0034] Figure 10 This is a far-field radiation diagram of an antenna structure at 8 GHz, according to an exemplary embodiment.

[0035] Figure 11 This is an electric field distribution diagram of an antenna structure at 8 GHz, according to an exemplary embodiment.

[0036] Figure 12 This is a current distribution diagram of an antenna structure at 8 GHz, according to an exemplary embodiment. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0038] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0039] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0040] Figure 1 This is a schematic diagram of an antenna structure 100 according to an exemplary embodiment. Figure 2 yes Figure 1 100-degree exploded view of the antenna structure. Figure 3 yes Figure 1 A cross-sectional schematic diagram of the antenna structure 100. (See diagram below.) Figures 1-3As shown, the antenna structure 100 may include a ground layer 1, a dielectric substrate 2, a feed line 3, and a radiator 4. The dielectric substrate 2 may be disposed on the surface of the ground layer 1, and the radiator 4 may be disposed on the surface of the dielectric substrate 2 opposite to the ground layer 1. The feed line 3 may be arranged within the dielectric substrate 2. The radiator 4 may include a radiating portion 41, a hollow region 42, a feed point 43, and a ground point 44. The ground point 44 and the feed point 43 are arranged at intervals on the radiating portion 41. The ground point 44 can be connected to the ground layer 1 through a grounding via disposed on the dielectric substrate 2, enabling the signal fed by the feed line 3 to return to ground. The feed point 43 can be connected through a feed blind via disposed on the dielectric substrate 2. Specifically, electrical connection can be achieved through metal, conductive wire, or conductive spring located within the feed blind via. A single radiator 4 may be disposed on the same dielectric substrate 2. In other embodiments, multiple radiators 4 may be disposed on the same dielectric substrate 2, and each radiator 4 is electrically connected to a corresponding feed line 3.

[0041] The radiating section 41 can form a hollow region 42. The radiating section 41 can include a first radiating region 411 and a second radiating region 412, which are arranged at intervals on the radiating section 41. The first radiating region 411 can be used to radiate signals in a first frequency band, and the second radiating region 412 can be used to radiate signals in a second frequency band. The first frequency band is distinct from the second frequency band, and both the first and second frequency bands belong to UWB (Ultra Wideband). Band (ultra-wideband) frequency band; by hollowing out the middle region of the radiator 4 to form a hollow area 42 and coordinating the reasonable arrangement of the feed point 43 and the grounding point 44, the current path of the radiator 41 when radiating the first frequency band signal and the current path when radiating the second frequency band signal can be adjusted, so that the positions of the current strong point and the current weak point on the current path are different, thereby achieving the purpose of dual-frequency resonance of the radiator 4. Compared with the related technology, which sets a row of grounding through holes on the same radiator as an isolation wall and further uses a power distribution structure to achieve dual-frequency radiation, this disclosure can adjust the current path by adjusting the structure of the radiator 4, thereby achieving dual-frequency resonance while avoiding the isolation wall and power distribution structure in the related technology, simplifying the power distribution structure, and reducing the risk of impedance mismatch caused by the processing error of the power distribution structure.

[0042] Furthermore, to protect the radiator 4, the antenna structure 100 may also include a protective layer 5. This protective layer 5 is disposed on the side of the dielectric substrate 2 facing away from the ground layer 1, and it can cover the radiator 4, reducing scratches on the radiator 4. The protective layer 5 may include an insulating layer, such as a plastic film, to prevent interference with the radiation from the radiator 4. In the above embodiment, the dielectric substrate 2 may include a first dielectric substrate 21 and a second dielectric substrate 22. The feed line 3 may be disposed between the first dielectric substrate 21 and the second dielectric substrate 22. The radiator 4 may be disposed on the surface of the first dielectric substrate 21. The second dielectric substrate 22 may be connected to the ground layer 1. A through-hole (not shown) may be provided on the first dielectric substrate 21. The feed point 43 and the feed line 3 can be connected through a conductive element disposed in the through-hole. The first dielectric substrate 21 and the second dielectric substrate 22 may be bonded together to prevent the feed line 3 from being exposed. The first dielectric substrate 21 and the second dielectric substrate 22 may include a liquid crystal polymer substrate. By utilizing the high-frequency and low-loss characteristics of the liquid crystal polymer substrate, signal loss in the first and second frequency bands can be reduced.

[0043] Currently, according to the US Federal Communications Commission (FCC) regulations, the UWB band can cover a frequency range of 3.1 GHz to 10.6 GHz, with a minimum operating bandwidth of 500 MHz. The current mainstream UWB bands in China have center frequencies of 6.5 GHz and 8 GHz, with bandwidths exceeding 500 MHz. They operate on the fifth and ninth channels of the UWB channel allocation, with the fifth channel covering 6.25 GHz to 6.75 GHz and the ninth channel covering 7.75 GHz to 8.25 GHz. Therefore, by adjusting the size and shape of the radiator 4, the center frequency of the first band can be set to 6.5 GHz, with a range of 6.25 GHz to 6.75 GHz, and the center frequency of the second band can be set to 8 GHz, with a range of 7.75 GHz to 8.25 GHz, thus achieving coverage of the mainstream UWB bands by this antenna structure.

[0044] For example, in the embodiments provided in this disclosure, the radiator 4 can be rectangular, the hollow region 42 can also be rectangular, the first radiation region 411 and the second radiation region 412 can be located at the corners of the radiating part 41, and the corners of the first radiation region 411 and the second radiation region 412 are adjacent to each other. The feed point 43 can be located at the middle of the edge of the radiating part 41 that is connected to the second radiation region 412 and away from the first radiation region 411. The grounding point 44 can be located at the corner diagonally opposite to the second radiation region 412. Figure 4Taking the illustrated embodiment as an example, the first radiation region 411 can be located at the upper left corner of the radiator 4, the second radiation region 412 can be located at the upper right corner of the radiator 4, the feed point 43 is located in the middle area of ​​the left edge of the radiating part 41, and the grounding point 44 is located at the small left corner. Thus, the length of the effective current path of the first radiation region 411 is greater than the length of the effective current path of the second radiation region 412. The length of the effective current path is inversely proportional to the radiation frequency. Therefore, the frequency of the first frequency band radiated by the radiating part 41 will be less than the frequency of the second frequency band.

[0045] based on Figure 4 The antenna structure 100 provided in the simulation is based on a first frequency band with a center frequency of 6.5 GHz and a range of 6.25 GHz to 6.75 GHz, and a second frequency band with a center frequency of 8 GHz and a range of 7.75 GHz to 8.25 GHz. Figure 5 As can be seen from the S-parameter curves shown, this antenna structure can cover the aforementioned frequency band, and according to... Figure 6 As shown in the antenna efficiency curves, the antenna efficiency reaches -8.35 dB at 6.5 GHz and -7.38 dB at 8 GHz, meeting the communication requirements of antenna structure 100. Furthermore, based on this simulation, we can obtain... Figures 7-9 The simulation diagram shown is related to the center frequency of 6.5 GHz, and as shown in the figure. Figures 10-12 The simulation diagram shown is for a center frequency of 8 GHz.

[0046] according to Figure 7 and Figure 10 The far-field radiation pattern shown demonstrates that within the plane above the dielectric substrate 2, the first radiation region 411 and the second radiation region 412 can achieve good omnidirectional radiation, which is beneficial for improving the radiation efficiency of the antenna structure 100; according to Figure 8 and Figure 11 The electric field distribution diagram shows that the electric field is strongest in the first radiation region 411 at 6.5 GHz, therefore this first radiation region 411 is the main radiation region for signals within the first frequency band. The electric field is strongest in the second radiation region 412 at 8 GHz, therefore this second radiation region 412 is the main radiation region for signals within the second frequency band. According to... Figure 9 and Figure 12The current distribution diagram shows that at 6.5 GHz, the strong current point is located near the grounding point 44, and the current direction is from left to right and from top to bottom, forming a weak current point in the first radiation region 411; at 8 GHz, the strong current point is located near the feed point 43, and the current direction is from bottom to top, forming a weak current point in the second radiation region 412. It can be seen that at 6.5 GHz and 8 GHz, the strong current point and the weak current point on the current path are different, and the direction of the current path is also different. This can reduce the mutual interference between resonances of different frequency bands while realizing dual-frequency resonant vibration.

[0047] It is understandable that when antenna structure 100 is applied to different electronic devices, the different environments within the electronic devices may cause a certain frequency offset to antenna structure 100. Therefore, as Figure 4 As shown, the first radiation region 411 may include a first step portion 413, and the second radiation region 412 may include a second step portion 414. The first step portion 413 can limit the current path at 6.5 GHz and adjust the effective length of the current path at 6.5 GHz, thereby avoiding frequency deviation caused by the internal environment of the electronic device. Similarly, the second step portion 414 can limit the current path at 8 GHz and adjust the effective length of the current path at 8 GHz, thereby avoiding frequency deviation caused by the internal environment of the electronic device.

[0048] The first stepped portion 413 and the second stepped portion 414 are located on adjacent side edges of the radial portion 41, for example... Figure 4 As shown, the first step portion 413 is located at the right edge of the radiating portion 41, and the second step portion 414 is located at the upper edge of the radiating portion 41. This allows the first step portion 413 to limit the current path at 6.5 GHz while reducing the impact on the current path at 8 GHz, facilitating independent adjustment of the first and second frequency bands. In this disclosure, the first radiating region 411 including the first step portion 413 and the second radiating region 412 including the second step portion 414 are used as examples. In other embodiments, the first radiating region 411 may include the first step portion 413 or the second radiating region 412 may include the second step portion 414; this disclosure does not impose any limitations on this. The above embodiments are all described using the example of a center frequency of 6.5 GHz for the first frequency band and 8 GHz for the second frequency band. Of course, with reasonable settings, the center frequency of the first frequency band can also be the center frequency of other channels in the UWB band, and the center frequency of the second frequency band can also be the center frequency of other channels in the UWB band; this disclosure does not impose any limitations on this.

[0049] Still with Figure 4 In the illustrated embodiment, the width of the edge of the radiating portion 41 located between the first radiating region 411 and the second radiating region 412 is smaller than the width of the opposite edge. That is, in Figure 4 As shown, the width of the upper edge in the vertical direction is smaller than the width of the lower edge in the vertical direction. This reduces the current at the edge between the first radiation region 411 and the second radiation region 412, which helps to reduce interference between signals in the first frequency band and signals in the second frequency band. (Continuing with...) Figure 4 As shown, taking a first frequency band with a center frequency of 6.5 GHz and a range of 6.25 GHz-6.75 GHz, a second frequency band with a center frequency of 8 GHz and a range of 7.75 GHz-8.25 GHz as an example, the length of the radiator 4 can be 11.56 mm and the width can be 9.35 mm, and the edge between the first radiation area 411 and the second radiation area 412 is set along the length direction of the radiating part 41.

[0050] Based on the above embodiments, this disclosure also provides an electronic device that may include the antenna structure 100 described in any of the above embodiments. By configuring the antenna structure 100, the electronic device can achieve indoor positioning, especially compensating for the shortcomings of GPS positioning systems in relatively enclosed environments.

[0051] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0052] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna structure, characterized in that, include: Grounding layer; A dielectric substrate, wherein the dielectric substrate is disposed on the surface of the ground layer; A feed line is disposed within the dielectric substrate; A radiator is disposed on the surface of the dielectric substrate away from the ground layer. The radiator includes a radiating part, a hollow region, a feed point, and a ground point spaced apart from the feed point. The radiating part surrounds the hollow region. The feed point and the ground point are both disposed on the radiating part. The ground point is conductive to the ground layer, and the feed point is electrically connected to the feed line. The radiating part includes a first radiating area and a second radiating area spaced apart from the first radiating area. The first radiating area is used to radiate signals in a first frequency band, and the second radiating area is used to radiate signals in a second frequency band. The first frequency band is different from the second frequency band, and both the first frequency band and the second frequency band belong to the ultra-wideband frequency band. The radiator is rectangular in shape, and the first radiation area and the second radiation area are respectively located at the corners of the radiating part, and the corners where the first radiation area is located and the corners where the second radiation area is located are adjacent to each other. The feed point is located at the middle of the edge where the radiating part connects to the second radiating area and is far from the first radiating area, and the grounding point is located at the corner diagonally opposite to the second radiating area.

2. The antenna structure according to claim 1, characterized in that, The frequency of the first frequency band is lower than the frequency of the second frequency band.

3. The antenna structure according to claim 2, characterized in that, The first radiation region and / or the second radiation region include a stepped portion, which is used to limit the current path.

4. The antenna structure according to claim 3, characterized in that, The first radiation zone and the second radiation zone each include a stepped portion, which is located on adjacent side edges of the radiation portion.

5. The antenna structure according to claim 2, characterized in that, The width of the edge of the radiating part located between the first radiating area and the second radiating area is smaller than the width of the opposite edge.

6. The antenna structure according to claim 2, characterized in that, The radiator has a length of 11.56 mm and a width of 9.35 mm, and the edge between the first radiating area and the second radiating area is set along the length direction of the radiating part.

7. The antenna structure according to claim 1, characterized in that, It also includes a protective layer disposed on the side of the dielectric substrate opposite to the ground layer and covering the radiator.

8. The antenna structure according to claim 1, characterized in that, The dielectric substrate includes a first dielectric substrate and a second dielectric substrate stacked together. The feed line is disposed between the first dielectric substrate and the second dielectric substrate. The radiator is disposed on the surface of the first dielectric substrate. The second dielectric substrate is connected to the ground layer. The first dielectric substrate includes a through hole. The feed point and the feed line are connected through the through hole.

9. The antenna structure according to claim 1, characterized in that, The center frequency of the first frequency band is 6.5 GHz, and the center frequency of the second frequency band is 8 GHz.

10. An electronic device, characterized in that, The antenna structure includes any one of claims 1-9.

Images