Antenna structure

Abstract

An antenna structure is provided that includes first and second radiating elements, first and second ground planes, and a connection structure. The first ground plane is disposed adjacent to and coupled to the first radiating element. The second ground plane is disposed adjacent to and coupled to the second radiating element. The connection structure connects an edge of the first ground plane to an edge of the second ground plane such that the first ground plane is connected to the second ground plane through the connection structure.

Description

Cross-references to related documents

[0001] This application claims priority to U.S. patent application No. 63 / 400,744, filed on August 24, 2022, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The present invention generally relates to an antenna structure having a pair of ground planes. More particularly, the present invention relates to an antenna structure having a connection structure having a high dielectric constant for connecting the ground planes. Background Art

[0003] Sector antennas are directional antennas that transmit and receive signals in a specific direction and are suitable for cellular networks where interference needs to be minimized. The front-to-back ratio (F / B ratio) is an important factor in evaluating directional antennas, because a high F / B ratio means that the antenna is less susceptible to interference from other directions. Many technologies have been developed to enhance the F / B ratio of antennas and antenna arrays. A common method is to add large metal plates or additional components to the antenna ground plane to reflect the RF signal back to the front. However, this method increases the size and wind load of the antenna, making it less ideal for use in outdoor environments.

[0004] Another method is to add absorbers, choke walls, metal rings or artificial magnetic conductors (AMC) to the edge of the antenna ground plane to reduce edge diffraction and suppress backlobe radiation. However, the height of these additional components depends on the resonant frequency of the antenna, usually resulting in an increase in the overall height of the antenna. Moreover, this method can only be implemented at narrowband frequencies and is not suitable for all antenna types.

[0005] Closed antenna structures (such as horn antennas) inherently exhibit high F / B ratio radiation, but are very bulky compared to other antenna types (such as patch antennas, monopoles, dipoles, or slot antennas). Other approaches use complementary single-sided antennas, such as a combination of electric and magnetic dipoles, to cancel backlobe radiation. However, these approaches require special antenna element designs and are not universal techniques suitable for all antenna types.

[0006] Therefore, it is necessary to develop a novel antenna structure to solve the above problems. Summary of the invention

[0007] According to a first aspect of the present invention, an antenna structure comprises a first radiating element, a first ground plane, a second radiating element, a second ground plane and a high dielectric constant connection structure. The first ground plane is arranged adjacent to the first radiating element and coupled to the first radiating element. The second ground plane is arranged adjacent to the second radiating element and coupled to the second radiating element. The first ground plane is located between the second ground plane and the first radiating element, and the second ground plane is located between the first ground plane and the second radiating element. The high dielectric constant connection structure connects an edge of the first ground plane to an edge of the second ground plane, so that the first ground plane is connected to the second ground plane through the connection structure.

[0008] According to an embodiment of the present invention, the dielectric constant of the high dielectric constant connection structure is in the range of 6 to 10.

[0009] According to an embodiment of the present invention, the material of the high dielectric constant connection structure includes aluminum oxide.

[0010] According to one embodiment of the present invention, the high dielectric constant connection structure includes a top portion connected to an edge of a first ground plane, a bottom portion connected to an edge of a second ground plane, and a middle portion connecting the top portion and the bottom portion and located therebetween.

[0011] According to one embodiment of the invention, the top portion, the middle portion and the bottom portion are made of the same material.

[0012] According to one embodiment of the invention, the top portion and the bottom portion are made of the same material, and the middle portion is made of a material different from the material of the top portion and the bottom portion.

[0013] According to one embodiment of the present invention, the first radiation element includes a first feed portion and a pair of first radiation portions. The first radiation portions are located at two opposite sides of the first feed portion and connected to the first feed portion. The first feed portion is spaced apart from each of the radiation portions along a first direction, wherein the first direction is different from an extension direction of the first feed portion.

[0014] According to one embodiment of the present invention, the antenna structure further comprises a pair of first supporting elements penetrating the first radiation element and the first ground plane.

[0015] According to an embodiment of the present invention, the antenna structure further comprises a first feeding probe located between the first feeding portion of the first radiating element and the first ground plane. The first ground plane is coupled to the first radiating element through the first feeding probe and the first feeding portion.

[0016] According to one embodiment of the present invention, the second radiation element comprises a second feed portion and a pair of second radiation portions. The second radiation portions are located at two opposite sides of the feed portion and connected to the second feed portion. The second feed portion is spaced apart from each of the second radiation portions along a first direction, wherein the first direction is different from an extension direction of the second feed portion.

[0017] According to one embodiment of the present invention, the antenna structure further comprises a pair of second supporting elements penetrating the second radiation element and the second ground plane.

[0018] According to one embodiment of the present invention, the antenna structure further comprises a second feeding probe located between the second feeding portion of the second radiating element and the second ground plane. The second ground plane is coupled to the second radiating element through the second feeding probe and the second feeding portion.

[0019] According to an embodiment of the present invention, the shape of the first radiation element is the same as the shape of the second radiation element.

[0020] According to an embodiment of the invention, the first radiating element and the second radiating element are E-shaped.

[0021] According to an embodiment of the invention, each of the radiating elements has two grooves.

[0022] According to one embodiment of the invention, the opening of the groove of the first radiating element faces a first side of the antenna structure, and the opening of the groove of the second radiating element faces a second side of the antenna structure opposite to the first side.

[0023] According to an embodiment of the invention, the first radiating element vertically overlaps the second radiating element.

[0024] According to one embodiment of the present invention, the high dielectric constant connection structure extends vertically between the first ground plane and the second ground plane.

[0025] Based on the above, in an embodiment of the present invention, the two radiating elements of the antenna structure are arranged back to back, and they are connected by a connecting structure to form a side wall (or side branch) of the antenna structure. The material of the connecting structure is selected to have a high dielectric constant. With this configuration, the antenna structure of the present invention can concentrate the power gain in the direction in front of it while maintaining a compact volume. Therefore, the F / B ratio of the antenna structure can be enhanced, making it conducive to coverage sectorization. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Embodiments of the present invention are described in more detail below with reference to the accompanying drawings, in which:

[0027] Figure 1A A perspective view showing an antenna array according to a first embodiment of the present invention;

[0028] Figure 1B Show Figure 1A The reflection frequency characteristics of the upper antenna array part in FIG.

[0029] Figure 1C Show Figure 1A Two-dimensional (2D) radiation pattern of the antenna array in;

[0030] Figure 2A A perspective view showing an antenna array according to a comparative embodiment;

[0031] Figure 2B Show Figure 2A The reflection frequency characteristics of the upper antenna array part in FIG.

[0032] Figure 2C Show Figure 2A 2D radiation pattern of the antenna array in;

[0033] Figure 3A A perspective view showing an antenna array according to a second embodiment of the present invention;

[0034] Figure 3B Show Figure 3A The reflection frequency characteristics of the upper antenna array part in FIG.

[0035] Figure 3C Show Figure 3A 2D radiation pattern of the antenna array in;

[0036] Figure 4A A perspective view showing an antenna array according to a third embodiment of the present invention;

[0037] Figure 4B Show Figure 4A The reflection frequency characteristics of the upper antenna array portion in; and

[0038] Figure 4C Show Figure 4A 2D radiation pattern of the antenna array in. DETAILED DESCRIPTION

[0039] In the following description, antenna arrays or antenna structures, etc. are described as preferred examples. It will be clear to those skilled in the art that modifications including additions and / or substitutions can be made without departing from the scope and spirit of the invention. Certain details may be omitted so as not to obscure the invention; however, this disclosure is written to enable those skilled in the art to practice the teachings herein without undue experimentation.

[0040] For ease of explanation, in the embodiments of the present invention, the antenna structure and the antenna array are located in a space defined by different X-axis, Y-axis and Z-axis, wherein the X-axis, Y-axis and Z-axis are perpendicular to each other. The direction parallel to the X-axis is called the X-axis direction, the direction parallel to the Y-axis is called the Y-axis direction, and the direction parallel to the Z-axis is called the Z-axis direction.

[0041] Figure 1A A perspective view is shown of an antenna array 200 according to a first embodiment of the present invention. Figure 1B Show Figure 1A Reflection frequency characteristics of the upper antenna array part. Figure 1C Show Figure 1A Two-dimensional (2D) radiation pattern of the antenna array 200 in FIG.

[0042] refer to Figure 1A The following description is made. According to the first embodiment of the present invention, the antenna array 200 includes a plurality of antenna structures 100. Each of the antenna structures 100 includes a radiation element 110, 120, a ground plane 130, 140, a feed probe 152, a connection structure 160 and support elements 172, 174.

[0043] A radiating element is a component used to transmit electromagnetic waves. The function of a radiating element is to radiate electromagnetic waves from a conductor or to convert received electromagnetic waves into electrical signals. Radiating elements are usually made of conductors such as metal wires, plates, patches, etc. Figure 1A , the upper radiation element 110 includes a feeding portion 112 and a pair of radiation portions 114 located at two opposite sides of the feeding portion 112. The feeding portion 112 is located between and connected to the radiation portions 114. The feeding portion 112 is located between and connected to the two radiation portions 114. The feeding portion 112 extends along the X-axis direction, and an edge of the feeding portion 112 is aligned with an edge of the radiation portion 114. In the radiation element 110, the two radiation portions 114 are symmetrically arranged with respect to the feeding portion 112.

[0044] The radiation element 110 has a pair of grooves G1, and is, for example, an L-shaped groove. A portion of the groove G1 extends in the Z-axis direction and extends into the radiation portion 114, and another portion of the L-shaped groove G1 extends along the X-axis direction, so that the opening OG1 of the groove G1 faces one side S1 of the antenna structure 100. In the radiation element 110, the two grooves G1 are arranged symmetrically with respect to the feeding portion 112. The feeding portion 112 is spaced apart from each of the radiation portions 114 along the Z-axis direction by the corresponding groove G1. Overall, the shape of the radiation element 110 is, for example, an E-shape.

[0045] In the first embodiment, the upper radiating element 110 in the antenna structure 100 can be connected to other upper radiating elements in other antenna structures 100 through a connector to form an upper antenna array portion facing the +Y axis direction, wherein the connector can be, for example, an RF power (radio frequency power) combiner. In addition, Figure 1A The number of the upper radiation elements 110 in the embodiment is, for example, 4. In other embodiments, the number of the upper radiation elements can be modified according to the requirements of ordinary technicians in the relevant field, but the present invention is not limited thereto.

[0046] Similarly, the lower radiation element 120 includes a feeding portion 122 and a pair of radiation portions 124 located at two opposite sides of the feeding portion 122. The feeding portion 122 is located between and connected to the radiation portions 124. The feeding portion 122 is located between and connected to the two radiation portions 124. The feeding portion 122 extends along the X-axis direction, and an edge of the feeding portion 122 is aligned with an edge of the radiation portion 124. In the radiation element 120, the two radiation portions 124 are symmetrically arranged with respect to the feeding portion 122.

[0047] The radiation element 120 has a pair of grooves G2, and is, for example, an L-shaped groove. A portion of the groove G2 extends in the Z-axis direction and extends into the radiation portion 124, and another portion of the groove G2 extends along the X-axis direction, so that the opening of the groove G2 (not shown) faces the other side S2 of the antenna structure 100. The openings of the radiation elements 110, 120 face the opposite sides S1, S2 of the antenna structure 100, respectively, indicating that the two radiation elements 110, 120 are arranged back to back. The back-to-back configuration of the two radiation elements 110, 120 provides advantages such as reduced backlobe radiation, increased total gain, and improved directivity of the antenna structure 100. In the radiation element 120, the two grooves G2 are arranged symmetrically with respect to the feeding portion 122. In the Z-axis direction, the feeding portion 122 is spaced apart from each of the radiation portions 124 along the Z-axis direction by the corresponding groove G1. Overall, the shape of the radiation element 124 is, for example, an E-shape. The radiation element 110 overlaps the radiation element 120 vertically.

[0048] It should be noted that in the first embodiment, the radiation elements 110 and 120 can be designed to be E-shaped according to specific requirements. In other embodiments, ordinary technicians in the relevant field can design the appearance / shape of the radiation element according to their own needs, and the present invention is not limited thereto.

[0049] In the first embodiment, the lower radiating element 120 in the antenna structure 100 can be connected to other lower radiating elements in other antenna structures 100 through a connector to form a lower antenna array portion facing the -Y axis direction, wherein the connector can be, for example, an RF power combiner. The lower antenna array is terminated with a matching load. In addition, considering the symmetry, Figure 1A The number of lower radiation elements 110 in is the same as the number of radiation elements 110.

[0050] The ground plane refers to a component for providing a reference point or zero potential in the antenna structure 100. The ground plane 130 is disposed adjacent to the radiating element 110 and is coupled to the feed portion 112 of the radiating element 110 through, for example, a feed probe 152. The ground plane 130 is located between the ground plane 140 and the radiating element 110. The ground plane 140 is disposed adjacent to the radiating element 120 and is coupled to the feed portion 122 of the radiating element 120 through, for example, a feed probe (not shown). The ground plane 140 is located between the ground plane 130 and the radiating element 120. Each of the ground planes 130, 140 has, for example, a rectangular shape, wherein each of the ground planes 130, 140 has two short edges parallel to the X-axis direction and two long edges parallel to the Z-axis direction. The ground plane 130 or 140 is used to connect the antenna structure 100 to the ground, and is used to fix the antenna structure 100. The material of the radiating elements 110, 120, 130, 140 and the feeding probe may be a conductive material such as a metal, wherein the metal may be, for example, copper or aluminum. With this configuration, the radiating element 110 (or 120) may be excited by a corresponding feeding portion having a corresponding feeding point at a corresponding ground plane 130 (or 140).

[0051] The connection structure 160 is used to connect the edge (i.e., the long edge) of the ground plane 130 to the edge (i.e., the long edge) of the ground plane 140, so that the ground plane 130 is connected to the ground plane 140 through the connection structure 160. The connection structure 160 is vertically arranged between the two ground planes 130 and 140. Specifically, the connection structure 160 has a top portion 162, a middle portion 164, and a bottom portion 166, wherein the middle portion 164 is located between the top portion 162 and the bottom portion 164. Each of the portions 162, 164, and 166 extends along the Z-axis direction. The top portion 162 is directly connected to the long edge of the ground plane 130 and the middle portion 164. The middle portion 164 is directly connected to the top portion 162 and the bottom portion 164. The bottom portion 166 is directly connected to the middle portion 164 and the long edge of the ground plane 140. With this configuration, the connection structure 160 can act as a side wall (or side chain) of the antenna structure 100.

[0052] In order to further reduce the back lobe radiation, a material with a high dielectric constant can be selected for the connection structure 160. The above material selection is conducive to reducing edge diffraction, resulting in less radiation being emitted to the back side of the antenna structure 100, thereby enhancing the F / B ratio of the antenna structure 100. In an embodiment of the present invention, the high dielectric constant of the connection structure 160 is defined as a dielectric constant in the range of 6 to 10. In a first embodiment, the connection structure 160 can be made of, for example, metal. The top portion 162, the middle portion 164 and the bottom portion 166 of the connection structure 160 are made of the same material.

[0053] To further explain Figure 1A The effect of the connection structure 160 shown in FIG. Figure 2A Comparative embodiments of an antenna structure 10 and an antenna array 20 are shown. Figure 2B Show Figure 2A Reflection frequency characteristics of the upper antenna array part. Figure 2C Show Figure 2A 2D radiation pattern of the antenna array 20 in FIG. For the following description, refer to Figure 2A The antenna structure 10 (or antenna array 20) of the comparative embodiment is similar to that of the reference Figure 1A The antenna structure 100 (or antenna array 200) of the first embodiment described and illustrated, and the main difference is that the antenna structure 10 in the comparative embodiment lacks Figure 1A That is, the ground planes 13, 14 of the antenna structure 10 are not connected.

[0054] First, referring to the first embodiment Figure 1B , showing that the operating frequency range of the antenna array 200 is within the range of 1.45 GHz to 1.5 GHz. Figure 1C , the antenna array 200 exhibits a gain of 13.2 dBi in the +Y-axis direction and a gain of 3.5 dBi in the -Y-axis direction.

[0055] On the contrary, referring to the comparative example Figure 2B , showing that the operating frequency range of the antenna array 20 is in the range of 1.45 GHz to 1.5 GHz. Figure 2C , the antenna array 20 exhibits a gain of 5.3 dBi in the +Y-axis direction and a gain of 10.1 dBi in the -Y-axis direction.

[0056] From the above results, it can be observed that Figure 2A Compared with the comparative embodiment in FIG. 1 , the configuration of the connection structure 160 can sharpen the waveform of the operating frequency. Figure 2ACompared to the comparative embodiment in , the configuration of the connection structure 160 can reduce the power radiated in the −Y-axis direction, thereby resulting in a significant improvement in the front-to-back (F / B) ratio of the antenna array 200.

[0057] Return to reference Figure 1A , each of the support elements 172 penetrates the radiating portion 114 of the radiating element 110 and the ground plane 130. Similarly, each of the support elements 174 penetrates the radiating portion 124 of the radiating element 120 and the ground plane 140. In some embodiments, the support elements 172, 174 can be, for example, plastic columns. The configuration of the support elements 172, 174, the radiating elements 110, 120, and the ground planes 130, 140 can provide good mechanical support for the antenna structure 100.

[0058] Figure 3A A perspective view showing an antenna array 200a according to a second embodiment of the present invention. Figure 3B Show Figure 3A Reflection frequency characteristics of the upper antenna array part. Figure 3C Show Figure 3A 2D radiation pattern of the antenna array 200a in FIG.

[0059] For the following description reference Figure 3A According to the second embodiment of the present invention, the antenna structure 100a (or antenna array 200a) of the third embodiment is similar to the one described in reference Figure 1A The antenna structure 100 (or antenna array 200) of the first embodiment is described and illustrated, and the main difference is that the antenna structure 100a in the second embodiment has a connection structure 160a for connecting the ground plane 130 to the ground plane 140, and the connection structure 160a can be made of, for example, aluminum oxide (Al2O3) with a relative dielectric constant of 10. The top portion 162a, the middle portion 164a, and the bottom portion 166a of the connection structure 160a are made of the same material.

[0060] Referring to the second embodiment Figure 3B , showing that the operating frequency range of the antenna array 200a is within the range of 1.45 GHz to 1.5 GHz. Figure 3C , the antenna array 200a exhibits a gain of 13.4dBi in the +Y-axis direction and a gain of -5.6dBi in the -Y-axis direction.

[0061] Based on the above results, it can be observed that Figure 2A Compared with the comparative embodiment in FIG. 1 , the configuration of the connection structure 160a can sharpen the waveform of the operating frequency. Figure 2ACompared to the comparative embodiment in , the configuration of the connection structure 160a can further reduce the power radiated in the -Y-axis direction, thereby resulting in a significant improvement in the F / B ratio of the antenna array 200a.

[0062] Figure 4A A perspective view showing an antenna array 200b according to a third embodiment of the present invention. Figure 4B Show Figure 4A Reflection frequency characteristics of the upper antenna array part. Figure 4C Show Figure 4A 2D radiation pattern of the antenna array 200b in FIG.

[0063] For the following description reference Figure 4A According to the third embodiment of the present invention, the antenna structure 100b (or antenna array 200b) of the third embodiment is similar to the reference Figure 1A The antenna structure 100 (or antenna array 200) of the first embodiment described and illustrated, and the main difference is that the antenna structure 100b in the third embodiment has a connection structure 160b for connecting the ground plane 130 to the ground plane 140, wherein the connection structure 160b can be made of, for example, at least two different materials with a high dielectric constant. In detail, the connection structure 160b includes a top portion 162b, a middle portion 164b and a bottom portion 166b. The top portion 162b and the bottom portion 166b can be made of the same material, such as aluminum oxide. The middle portion 164b can be made of a material (such as metal) different from the material of the top portion 162b and the bottom portion 166b. That is, the connection structure 160b has a sandwich structure and is a composite connection structure.

[0064] Referring to the third embodiment Figure 4B , showing that the operating frequency range of the antenna array 200b is within the range of 1.45 GHz to 1.5 GHz. Figure 4C , the antenna array 200b exhibits a gain of 13.3 dBi in the +Y-axis direction and a gain of -2.0 dBi in the -Y-axis direction.

[0065] Based on the above results, it can be observed that Figure 2A Compared with the comparative embodiment in FIG. 1 , the configuration of the connection structure 160 b can sharpen the waveform of the operating frequency. Figure 2A Compared with the comparative embodiment in FIG. 1 , the provision of the connection structure 160 b can reduce the power radiated in the −Y axis direction, thereby greatly improving the F / B ratio of the antenna array 200 b.

[0066] In addition, through this material selection, the antenna array 200b can have a light weight and a good F / B ratio.

[0067] It should be noted that the configuration of the present invention is not limited to a specific resonant frequency, a specific type of antenna, and a specific wireless application.

[0068] Based on the above, in an embodiment of the present invention, the back-to-back arrangement of the upper radiating element and the lower radiating element and the connection structure between the ground planes allow for focused power gain in the front direction, which is conducive to coverage sectorization with a compact size. In addition, the material of the connection structure is selected as a material with a high dielectric constant; therefore, the connection structure can reduce edge diffraction, resulting in less radiation being emitted to the back side of the antenna structure. Therefore, the antenna structure of the present invention can have an excellent F / B ratio and a compact volume.

[0069] In addition, in order to balance the weight issue and the back lobe suppression effect, the connection structure can be a sandwich structure including a dielectric top part, a dielectric bottom part and a metal middle part located therebetween. In some embodiments, the material of the dielectric top part and the dielectric bottom part can be alumina. With this configuration, the antenna structure can have an excellent F / B ratio and keep the weight of the antenna structure low.

[0070] The functional units and modules of the antenna structures and antenna arrays according to the embodiments disclosed herein can be implemented using a computing device, a computer processor or an electronic circuit system, including but not limited to an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a microcontroller and other programmable logic devices configured or programmed according to the teachings of the present disclosure. The computer instructions or software codes running in the computing device, computer processor or programmable logic device can be easily made by practitioners in the field of software or electronic technology based on the teachings of the present disclosure.

[0071] All or part of the method according to the embodiment may be executed in one or more computing devices including a server computer, a personal computer, a laptop computer, a mobile computing device (eg, a smart phone), and a tablet computer.

[0072] Embodiments may include computer storage media, transient and non-transitory memory devices having stored therein computer instructions or software codes that may be used to program or configure a computing device, a computer processor, or an electronic circuit system to perform any of the processes of the present invention. Storage media, transient and non-transitory memory devices may include, but are not limited to, floppy disks, optical disks, Blu-ray disks, DVDs, CD-ROMs and magneto-optical disks, ROMs, RAMs, flash memory devices, or any type of media or device suitable for storing instructions, codes, and / or data.

[0073] Each of the functional units and modules according to various embodiments may also be implemented in a distributed computing environment and / or a cloud computing environment, where all or part of the machine instructions are executed in a distributed manner by one or more processing devices interconnected by a communication network, such as an intranet, a wide area network (WAN), a local area network (LAN), the Internet, and other forms of data transmission media.

[0074] The foregoing description of the present invention has been provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations will be apparent to those skilled in the art.

[0075] The embodiment was chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. An antenna structure, characterized in that: include: a first radiating element; a first ground plane disposed adjacent to and coupled to the first radiating element; a second radiating element; a second ground plane disposed adjacent to and coupled to the second radiating element, wherein the first ground plane is between the second ground plane and the first radiating element, and the second ground plane is between the first ground plane and the second radiating element; as well as A high dielectric constant connection structure connects an edge of the first ground plane to an edge of the second ground plane, so that the first ground plane is connected to the second ground plane through the connection structure.

2. The antenna structure according to claim 1, characterized in that: The dielectric constant of the high dielectric constant connection structure is in the range of 6 to 10.

3. The antenna structure according to claim 2, characterized in that: The material of the high dielectric constant connection structure includes aluminum oxide.

4. The antenna structure according to claim 1, characterized in that: The high dielectric constant connection structure includes a top portion connected to an edge of the first ground plane, a bottom portion connected to an edge of the second ground plane, and a middle portion connecting the top portion and the bottom portion and located therebetween.

5. The antenna structure according to claim 4, characterized in that: The top portion, the middle portion and the bottom portion are made of the same material.

6. The antenna structure according to claim 4, characterized in that: The top portion and the bottom portion are made of the same material, and the middle portion is made of a material different from that of the top portion and the bottom portion.

7. The antenna structure according to claim 1, characterized in that: The first radiating element comprises: a first feeding portion; and a pair of first radiating portions located at two opposite sides of the first feeding portion and connected to the first feeding portion, wherein the first feeding portions are spaced apart from each of the radiating portions along a first direction, wherein the first direction is different from an extending direction of the feeding portions.

8. The antenna structure according to claim 7, characterized in that: Further including: A pair of first supporting elements penetrates the first radiation element and the first ground plane.

9. The antenna structure according to claim 7, characterized in that: Further including: A first feeding probe is located between a first feeding portion of the first radiating element and the first ground plane, wherein the first ground plane is coupled to the first radiating element through the first feeding probe and the first feeding portion.

10. The antenna structure according to claim 1, characterized in that: The second radiating element comprises: a second feed portion; and a pair of second radiating portions located at two opposite sides of the feeding portion and connected to the second feeding portion, wherein the second feeding portion is spaced apart from each of the second radiating portions along a first direction, wherein the first direction is different from an extending direction of the second feeding portion.

11. The antenna structure according to claim 10, characterized in that: Further including: A pair of second supporting elements penetrates the second radiation element and the second ground plane.

12. The antenna structure according to claim 10, characterized in that: Further including: A second feeding probe is located between a second feeding portion of the second radiating element and the second ground plane, wherein the second ground plane is coupled to the second radiating element through the second feeding probe and the second feeding portion.

13. The antenna structure according to claim 1, characterized in that: The shape of the first radiation element is the same as that of the second radiation element.

14. The antenna structure according to claim 13, characterized in that: The first radiating element and the second radiating element are E-shaped.

15. The antenna structure according to claim 1, characterized in that: Each of the radiating elements has two grooves.

16. The antenna structure according to claim 15, characterized in that: An opening of the groove of the first radiating element faces a first side of the antenna structure, and an opening of the groove of the second radiating element faces a second side of the antenna structure opposite to the first side.

17. The antenna structure according to claim 1, characterized in that: The first radiating element vertically overlaps the second radiating element.

18. The antenna structure according to claim 1, characterized in that: The high dielectric constant connection structure extends vertically between the first ground plane and the second ground plane.

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