Dual-band antenna structure

Abstract

A dual-band antenna structure includes a substrate, a ground, a conductive patch, a transmitting antenna and a receiving antenna disposed on the substrate. The ground has a first and a second through hole. The transmitting antenna includes a first coupling conductive pad corresponding to the first through hole, a first conductive post electrically coupled to the first coupling conductive pad and the conductive patch, and a first feed-in conductive pad located in the first through hole. The first feed-in conductive pad can each have a capacitive effect with the first coupling conductive pad and the ground. The receiving antenna includes a second coupling conductive pad corresponding to the second through hole, a second conductive post electrically coupled to the second coupling conductive pad and the conductive patch, and a second feed-in conductive pad located in the second through hole. The second feed-in conductive pad can each have a capacitive effect with the second coupling conductive pad and the ground.

Description

Technical Field

[0001] This invention relates to an antenna structure, and more particularly to a dual-band antenna structure. Background Technology

[0002] To achieve dual-band functionality, existing dual-band antennas are designed with highly complex structures. For example, existing dual-band antennas employ intricate copper foil patterns on various circuit board layers. Another example is the use of two independently operating antenna architectures. In other words, the complex component composition and cumbersome manufacturing process of existing dual-band antennas result in high costs.

[0003] Therefore, the inventor believed that the above-mentioned defects could be improved, and thus devoted himself to research and applied scientific principles, and finally proposed an invention that is reasonably designed and effectively improves the above-mentioned defects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-frequency antenna structure that addresses the shortcomings of the prior art.

[0005] This invention discloses a dual-band antenna structure, comprising: a substrate including a first layer and a second layer; a grounding member disposed on the second layer, the grounding member having a first through hole and a second through hole spaced apart from each other; a conductive sheet disposed on the first layer; and a transmitting antenna disposed on the substrate, wherein the transmitting antenna includes: a first coupling conductive pad disposed between the first layer and the second layer, the position of the first coupling conductive pad corresponding to the first through hole; a first conductive post electrically coupled to the first coupling conductive pad and the conductive sheet; and a first feed conductive pad located within the first through hole, the first feed conductive pad and the first coupling conductive pad being capable of a series capacitance effect. The first feed conductive pad and the grounding element can generate a parallel capacitance effect to produce a left-hand circular polarization; and a receiving antenna is disposed on the substrate, and the receiving antenna includes: a second coupling conductive pad disposed between the first layer and the second layer, the position of the second coupling conductive pad corresponding to the second via; a second conductive post electrically coupled to the second coupling conductive pad and the conductive sheet; and a second feed conductive pad disposed on the second layer and located in the second via, the second feed conductive pad and the second coupling conductive pad can generate another series capacitance effect, and the second feed conductive pad and the grounding element can generate another parallel capacitance effect to produce a right-hand circular polarization.

[0006] In summary, the dual-band antenna structure disclosed in this embodiment of the invention, through the design that "the first coupling conductive pad and the second coupling conductive pad are disposed between the first layer and the second layer, and their positions correspond to the first through hole and the second through hole respectively", and "the first feed conductive pad can generate a capacitive effect with the first coupling conductive pad and the grounding component, and the second feed conductive pad can generate a capacitive effect with the second coupling conductive pad and the grounding component", not only has the effect of dual-band operation, but also simplifies the overall structure.

[0007] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0008] Figure 1 This is a three-dimensional schematic diagram of the dual-frequency antenna structure of the present invention.

[0009] Figure 2 For along Figure 1 A schematic diagram of the cross section along section II-II.

[0010] Figure 3 This is a top view of the dual-band antenna structure of the present invention.

[0011] Figure 4 This is a bottom view of the dual-band antenna structure of the present invention.

[0012] Figure 5 This is a schematic diagram of the return loss data measured by the dual-frequency antenna structure of the present invention.

[0013] The reference numerals in the above figures are:

[0014] 100: Dual-band antenna structure

[0015] 1: Substrate

[0016] 11: First floor

[0017] 12: Second layer

[0018] 2: Grounding component

[0019] H21: First through hole

[0020] H22: Second through hole

[0021] 3: Conductive sheet

[0022] S31: First side

[0023] S32: Second side

[0024] S33: Third side

[0025] S34: Fourth side

[0026] S35: Fifth side

[0027] S36: Sixth side

[0028] 4: Transmitting antenna

[0029] 41: First coupling conductive pad

[0030] 42: First conductive pillar

[0031] 43: First feed conductive pad; 5: Receiving antenna

[0032] 51: Second coupling conductive pad

[0033] 52: Second conductive post

[0034] 53: Second feed conductive pad D1: First shortest distance

[0035] D2: Second shortest distance

[0036] D3: Third shortest distance

[0037] G1: Transmit data cable

[0038] G2: Receive data line Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of the "dual-band antenna structure" disclosed in this invention. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. Furthermore, the accompanying drawings of this invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated beforehand. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention.

[0040] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used in this document should, as appropriate, include any combination of one or more of the related listed items.

[0041] Additionally, in the following description, if it is indicated that a specific diagram is referred to or as shown in a specific diagram, it is only to emphasize that most of the relevant content in the following description appears in that specific diagram, but does not limit the following description to refer only to that specific diagram.

[0042] See Figures 1 to 5 As shown, this embodiment provides a dual-band antenna structure 100. Figure 1 and Figure 2 As shown, the dual-band antenna structure 100 is applicable to a transmission frequency band, and the transmission frequency band includes a transmission frequency and a reception frequency. The dual-band antenna structure 100 includes a substrate 1, and a grounding element 2, a conductive sheet 3, a transmitting antenna 4, and a receiving antenna 5 disposed on the substrate 1. Next, the components of the dual-band antenna structure 100 and their connection relationships are described.

[0043] Re-reference Figure 2 As shown, the substrate 1 in this embodiment has a multilayer structure and has two printed circuit boards, which are stacked on top of each other and are respectively defined as a first layer 11 and a second layer 12.

[0044] like Figure 2 and Figure 4 As shown, the grounding element 2 in this embodiment can be a conductive copper foil, but the present invention is not limited thereto. The grounding element 2 is disposed on the side of the second layer 12 away from the first layer 11, and the grounding element 2 has a first through hole H21 and a second through hole H22 spaced apart from each other in a circular shape on the second layer 12. In other words, the side of the second layer 12 away from the first layer 11 has two configuration areas that are not covered by the grounding element 2.

[0045] See Figure 2 and Figure 3 As shown, the conductive sheet 3 is disposed on the side of the first layer 11 away from the second layer 12. In this embodiment, the conductive sheet 3 is a hexagonal conductive copper foil with six sides, and any two opposing sides are parallel to each other and have a first shortest distance D1. The first shortest distance D1 is between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

[0046] For example, the conductive sheet 3 has a first side S31, a second side S32, a third side S33, a fourth side S34, a fifth side S35, and a sixth side S36 in a clockwise direction. The first side S31 and the fourth side S34 are opposite to each other and parallel to each other, the second side S32 and the fifth side S35 are opposite to each other and parallel to each other, and the third side S33 and the sixth side are opposite to each other and parallel to each other. Wherein, when the wavelength corresponding to the center frequency of the transmission band is 12 millimeters (mm), the shortest distance between the first side S31 and the fourth side S34, the shortest distance between the second side S32 and the fifth side S35, and the shortest distance between the third side S33 and the sixth side S36 can be between 5.4 millimeters (mm) and 6.6 millimeters (mm).

[0047] Re-reference Figure 2 and Figure 4 As shown, the transmitting antenna 4 has the transmitting frequency and includes a first coupling conductive pad 41, a first conductive post 42, and a first feed conductive pad 43. In this embodiment, the first coupling conductive pad 41 can be a circular conductive copper foil, but the invention is not limited thereto. The first coupling conductive pad 41 is disposed between the first layer 11 and the second layer 12, such that the first coupling conductive pad 41 is sandwiched between the two printed circuit boards, and the positions of the first coupling conductive pad 41 correspond to the first through-hole H21. That is, the area of ​​the first coupling conductive pad 41 projected onto the second layer 12 is located within the first through-hole H21.

[0048] In this embodiment, the first conductive post 42 may be, for example, a conductive blind hole or a conductive through hole, but the present invention is not limited thereto. The first conductive post 42 is electrically coupled to the first coupling conductive pad 41 and the conductive sheet 3.

[0049] like Figure 2 and Figure 4 As shown, the first feed conductive pad 43 is disposed on the side of the second layer 12 away from the first layer 11 and located within the first through hole H21. The first feed conductive pad 43 and the first coupling conductive pad 41 can generate a series capacitance effect and produce a left-hand circular polarization. Furthermore, the first feed conductive pad 43 can also generate a parallel capacitance effect with the grounding member 2.

[0050] In this embodiment, the first feed conductive pad 43 is a circular conductive copper foil, and the position of the first feed conductive pad 43 projected onto the conductive sheet 3 is adjacent to one of the side edges (i.e., the first side edge S31). The first feed conductive pad 43 and the first through-hole H21 share a center. Furthermore, the center of the first feed conductive pad 43 preferably overlaps with the center of the first coupling conductive pad 41 projected onto the second layer 12, and the area of ​​the first feed conductive pad 43 is approximately equal to that of the first coupling conductive pad 41. In other words, there is a correlation between the dimensions of the first feed conductive pad 43, the first through-hole H21, and the first coupling conductive pad 41.

[0051] Of course, slight variations in the linkage are permissible (i.e., allowable tolerances). For example, in other embodiments of the invention not shown, the area of ​​the first feed conductive pad 43 may be slightly larger or slightly smaller than the area of ​​the first coupling conductive pad 41.

[0052] Re-reference Figure 2 and Figure 4 As shown, the receiving antenna 5 has the receiving frequency and includes a second coupling conductive pad 51, a second conductive post 52, and a second feed conductive pad 53. In this embodiment, the second coupling conductive pad 51 can be a circular conductive copper foil, but the invention is not limited thereto. The second coupling conductive pad 51 is disposed between the first layer 11 and the second layer 12, such that the second coupling conductive pad 51 is sandwiched between the two printed circuit boards, and the positions of the second coupling conductive pad 51 correspond to the second through-hole H22. That is, the area of ​​the first coupling conductive pad 41 projected onto the second layer 12 is located within the second through-hole H22.

[0053] In this embodiment, the second conductive post 52 may be, for example, a conductive blind hole or a conductive through hole, but the present invention is not limited thereto. The second conductive post 52 is electrically coupled to the second coupling conductive pad 51 and the conductive sheet 3.

[0054] like Figure 2 and Figure 4 As shown, the second feed conductive pad 53 is disposed on the side of the second layer 12 away from the first layer 11 and located within the second through hole H22. The second feed conductive pad 53 and the second coupling conductive pad 51 can generate a series capacitance effect and produce a right-hand circular polarization. Furthermore, the second feed conductive pad 53 can also generate a parallel capacitance effect with the grounding member 2.

[0055] In this embodiment, the second feed conductive pad 53 is a circular conductive copper foil, and the position of the second feed conductive pad 53 projected onto the conductive sheet 3 is adjacent to one of the side edges (i.e., the second side edge S32). The second feed conductive pad 53 and the second through-hole H22 share a center. Furthermore, the center of the second feed conductive pad 53 preferably overlaps with the center of the second coupling conductive pad 51 projected onto the second layer 12, and the area of ​​the second feed conductive pad 53 is approximately equal to that of the second coupling conductive pad 51. In other words, there is a correlation between the dimensions of the second feed conductive pad 53, the second through-hole H22, and the first coupling conductive pad 41.

[0056] Of course, slight variations in the linkage are permissible (i.e., allowable tolerances). For example, in other embodiments of the invention not shown, the area of ​​the second feed conductive pad 53 may be slightly larger or slightly smaller than the area of ​​the second coupling conductive pad 51.

[0057] Additionally, it is worth noting that, in order to ensure that the series capacitance effect of the first feed conductive pad 43 and the second feed conductive pad 53 is not disturbed, the area of ​​the first coupling conductive pad 41 projected onto the second layer 12 is not greater than the area of ​​the first through hole H21, and the area of ​​the second coupling conductive pad 51 projected onto the second layer 12 is not greater than the area of ​​the second through hole H22.

[0058] Therefore, the second shortest distance D2 between the position of the first coupling conductive pad 41 (or the first feed conductive pad 43) projected onto the conductive sheet 3 and the first side S31 can be not equal to the third shortest distance D3 between the position of the second coupling conductive pad 51 (or the second feed conductive pad 53) projected onto the conductive sheet 3 and the second side S32, and the second shortest distance D2 is less than the third shortest distance D3, so that the transmission frequency and the receiving frequency can have different ranges.

[0059] It should be noted that, Figure 5 This is a graph showing the return loss data measured by the dual-band antenna structure 100 of the present invention, and the graph includes a transmit data line G1 and a receive data line G2. From the graph, it is clear that the transmit data line G1 has low power between 14 GHz and 15 GHz, and the receive data line G2 has low power between 10 GHz and 12.7 GHz. That is, the transmit frequency of the dual-band antenna structure 100 of the present invention is preferably limited to between 14 GHz and 15 GHz, and the receive frequency is preferably limited to between 10.7 GHz and 12.7 GHz.

[0060] [Technical Effects of the Embodiments of the Invention]

[0061] In summary, the dual-band antenna structure disclosed in this embodiment of the invention, through the design of "two coupling conductive pads disposed between the first layer and the second layer, and their positions respectively corresponding to the two through holes", "the conductive sheet being electrically coupled to the two coupling conductive pads respectively through the two conductive pillars", and "the first feed conductive pad and the first feed conductive pad being able to generate a series capacitance effect with the two coupling conductive pads respectively, so as to produce a left-hand circular polarization and a right-hand circular polarization with opposite directions of rotation", the dual-band antenna structure not only has the effect of dual frequency, but also simplifies the overall structure.

[0062] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

Claims

1. A dual-frequency antenna structure, characterized in that, include: A substrate comprising a first layer and a second layer; A grounding element is disposed on the second layer, the grounding element having a first through hole and a second through hole spaced apart from each other; A conductive sheet is disposed on the first layer; A transmitting antenna is disposed on the substrate, and the transmitting antenna includes: A first coupling conductive pad is disposed between the first layer and the second layer, and the position of the first coupling conductive pad corresponds to the first through hole; A first conductive post is electrically coupled to the first coupling conductive pad and the conductive sheet; and A first feed conductive pad is located within the first through-hole. The first feed conductive pad and the first coupling conductive pad are connected in series with each other, and the first feed conductive pad and the grounding element are connected in parallel with each other, thereby generating a left-hand circular polarization. A receiving antenna is disposed on the substrate, and the receiving antenna comprises: A second coupling conductive pad is disposed between the first layer and the second layer, and the position of the second coupling conductive pad corresponds to the second through hole; A second conductive post, electrically coupled to the second coupling conductive pad and the conductive sheet; and A second feed conductive pad is disposed on the second layer and located in the second through hole. The second feed conductive pad and the second coupling conductive pad can generate another series capacitance effect, and the second feed conductive pad and the grounding element can generate another parallel capacitance effect to produce a right-hand circular polarization. The first feed conductive pad and the first through hole share a center, and the second feed conductive pad and the second through hole share a center; The center of the first feed conductive pad overlaps with the center of the first coupling conductive pad projected onto the second layer, and the center of the second feed conductive pad overlaps with the center of the second coupling conductive pad projected onto the second layer. The first feed conductive pad is approximately equal to the area of ​​the first coupling conductive pad, and the second feed conductive pad is approximately equal to the area of ​​the second coupling conductive pad.

2. The dual-frequency antenna structure according to claim 1, characterized in that, The dual-band antenna structure is applicable to a transmission frequency band; the conductive sheet has a hexagonal structure with six sides, and any two opposite sides are parallel to each other and have a first shortest distance, the first shortest distance being between 0.45 and 0.55 times the wavelength corresponding to a center frequency of the transmission frequency band.

3. The dual-frequency antenna structure according to claim 2, characterized in that, The first feed conductive pad is projected onto the conductive sheet at a position adjacent to one of the sides and has a second shortest distance, and the second feed conductive pad is projected onto the conductive sheet at a position adjacent to one of the sides and has a third shortest distance, wherein the second shortest distance is not equal to the third shortest distance.

4. The dual-frequency antenna structure according to claim 3, characterized in that, The second shortest distance is less than the third shortest distance.

5. The dual-frequency antenna structure according to claim 1, characterized in that, The area of ​​the first coupling conductive pad projected onto the second layer is not greater than the area of ​​the first through hole, and the area of ​​the second coupling conductive pad projected onto the second layer is not greater than the area of ​​the second through hole.

6. The dual-frequency antenna structure according to claim 1, characterized in that, The transmitting antenna has a transmitting frequency between 14 GHz and 15 GHz, and the receiving antenna has a receiving frequency between 10.7 GHz and 12.7 GHz.

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