Homopolar dual-feed antenna and electronic device

Abstract

The application relates to a same-polarization double-fed antenna and an electronic device, the same-polarization double-fed antenna comprising a first antenna unit working at a first frequency band and a second antenna unit working at a second frequency band, the first antenna unit and the second antenna unit extending along a first direction and being separated by a preset distance; a first feeding point is arranged at a middle position of the first antenna unit, the first antenna unit comprising a plurality of radiation sections arranged at intervals; the second antenna unit comprises a folded dipole extending along the first direction, and a second feeding point is arranged at a middle position of the second antenna unit. Both the two antenna units can radiate vertically polarized electromagnetic waves; the two antenna units are separated by a preset distance, and the second antenna unit comprises a folded dipole, an isolation degree pole is introduced, the coupling between the two antenna units is reduced, and the out-of-band coupling suppression is relatively strong, that is, the two antennas have a high isolation degree characteristic.

Description

Technical Field

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

[0002] With the development of mobile communication technology, new-generation communication equipment needs to be backward compatible with traditional standards such as 2.4G and 5G, and to achieve multi-band collaborative operation. This multi-band coexistence scenario poses a severe challenge to antenna systems. For example, two antennas may be placed orthogonally (perpendicularly to each other) to achieve high isolation, but the currents of the two antennas are orthogonal (perpendicular to each other), and the two antennas radiate vertically polarized and horizontally polarized electromagnetic waves respectively, resulting in polarization inconsistency, and the overall segment size is relatively large. Utility Model Content

[0003] The purpose of this application is to provide an antenna and electronic device that aims to solve the problem of insufficient isolation in traditional multi-band antenna systems.

[0004] In a first aspect, embodiments of this application provide a co-polarized dual-fed antenna, including a first antenna element operating in a first frequency band and a second antenna element operating in a second frequency band. The first antenna element and the second antenna element both extend along a first direction and are separated by a preset distance. A first feed point is provided at the middle position of the first antenna element, and the first antenna element includes a plurality of radiating segments arranged at intervals. The second antenna element includes a folded vibrator extending along the first direction, and a second feed point is provided at the middle position.

[0005] In some embodiments, the plurality of radiating segments include two or three radiating segments, which are arranged symmetrically relative to the first feed point.

[0006] In some embodiments, the plurality of radiating segments include a first radiating segment, a second radiating segment, and a third radiating segment arranged sequentially at intervals. The second radiating segment includes a first sub-radiating segment and a second sub-radiating segment separated by a first coupling gap. The first sub-radiating segment is arranged close to the first radiating segment, and the second sub-radiating segment is arranged close to the third radiating segment. The first feed point is located at the first coupling gap.

[0007] In some embodiments, the first sub-radiating segment has a first slit, and the second sub-radiating segment has a second slit. The first slit and the second slit extend along the first direction and are symmetrical with respect to the first coupling gap.

[0008] In some embodiments, the first slit and the second slit are semi-closed slits, and one end of the first slit and one end of the second slit are respectively connected to the first coupling gap.

[0009] In some embodiments, the second slit is L-shaped.

[0010] In some embodiments, the folded oscillator includes a fourth radiating segment, a fifth radiating segment, and a linear radiating segment. The fifth radiating segment is L-shaped and separated from the fourth radiating segment by a second coupling gap. The fourth and fifth radiating segments are symmetrical about the second coupling gap. The second feed point is located at the second coupling gap. The long sides of the fourth and fifth radiating segments are arranged along the first direction. The short side of the fourth radiating segment is located at the end of the fourth radiating segment away from the second coupling gap. The two ends of the linear radiating segment are respectively connected to the outer ends of the short sides of the fourth and fifth radiating segments.

[0011] In some embodiments, a third slit is formed between the straight radiating segment and the long side of the fourth radiating segment and the long side of the fifth radiating segment.

[0012] In some embodiments, the fourth radiating segment has a first groove on the side opposite to the first antenna unit, and the fifth radiating segment has a second groove on the side opposite to the first antenna unit.

[0013] In some embodiments, the plurality of radiating segments include a first radiating segment, a second radiating segment, and a third radiating segment arranged sequentially at intervals. The first radiating segment and the second radiating segment are separated by a third coupling gap, and the second radiating segment and the third radiating segment are separated by a fourth coupling gap. The first groove is directly opposite to the third coupling gap, and the second groove is directly opposite to the fourth coupling gap.

[0014] Secondly, embodiments of this application provide an electronic device, including the co-polarized dual-fed antenna as described above.

[0015] The beneficial effects of this application embodiment compared with related technologies are as follows: The co-polarized dual-fed antenna provided in this application embodiment includes a first antenna element operating in a first frequency band and a second antenna element operating in a second frequency band. The first antenna element and the second antenna element both extend along a first direction and are separated by a preset distance. A first feed point is provided at the middle position of the first antenna element, and the first antenna element includes multiple radiating segments arranged at intervals. The second antenna element includes a folded dipole extending along the first direction, and a second feed point is provided at the middle position. Both antenna elements can radiate vertically polarized electromagnetic waves. The two antenna elements are separated by a preset distance, and the second antenna element includes a folded dipole, introducing an isolation pole to reduce the coupling between the two antenna elements and have strong out-of-band coupling suppression, that is, there is a high isolation characteristic between the two antennas. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of a co-polarized dual-fed antenna provided in an embodiment of this application; Figure 2 for Figure 1 The S-parameter curves of the co-polarized doubly fed antenna are shown. Figure 3A for Figure 1 The radiation pattern of the first antenna element of the co-polarized dual-fed antenna is shown. Figure 3B for Figure 1 The radiation pattern of the second antenna element of the co-polarized dual-fed antenna is shown. Figure 4 for Figure 1 The diagram shows the isolation pole variation of the S-parameter curves of a co-polarized doubly fed antenna. Figure 5 This is a schematic diagram of the structure of a co-polarized dual-fed antenna provided in an embodiment of this application; Figure 6 for Figure 5 The S-parameter curves of the co-polarized doubly fed antenna are shown. Figure 7 for Figure 5 The diagram shows the isolation pole variation of the S-parameter curves of a co-polarized doubly fed antenna. Figure 8 This is a schematic diagram of the structure of a co-polarized dual-fed antenna provided in an embodiment of this application; Figure 9 for Figure 8 The S-parameter curves of the co-polarized doubly fed antenna are shown. Figure 10 for Figure 8 The S-parameter curves of the co-polarized doubly fed antenna with and without slots are shown. Figure 11 This is a schematic diagram of the structure of a co-polarized dual-fed antenna provided in an embodiment of this application; Figure 12 for Figure 11 The S-parameter curves of the co-polarized dual-fed antenna with and without notches are shown. Figure 13 for Figure 11 The S-parameter curves of the co-polarized doubly fed antenna are shown. Figure 14A for Figure 11 The radiation pattern of the second antenna element of the co-polarized dual-fed antenna is shown. Figure 14B for Figure 11 The radiation pattern of the first antenna element of the co-polarized doubly fed antenna is shown. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] Please see Figure 1 One embodiment of this application proposes a co-polarized dual-fed antenna, including a first antenna element 11 operating in a first frequency band and a second antenna element 12 operating in a second frequency band. The first antenna element 11 and the second antenna element 12 both extend along a first direction Y and are separated by a preset distance d. A first feed point 13 is provided at the middle position of the first antenna element 11, and the first antenna element 11 includes a plurality of radiating segments 111 and 112 arranged at intervals. The second antenna element 12 includes a folded vibrator 121 extending along the first direction Y, and a second feed point 14 is provided at the middle position.

[0022] The co-polarized dual-fed antenna can be mounted on the circuit board 100. For example, the first frequency band is a 5GHz band, such as 5.15 GHz to 5.85 GHz. The second frequency band is a 2GHz band, such as 2.4 GHz to 2.5 GHz. The multiple radiating segments 111 and 112 in the first antenna element 11 correspond to or are used to radiate different sub-frequency bands.

[0023] In some embodiments, the first antenna element 11 and the second antenna element 12 are parallel to each other. The preset distance d generally refers to the distance between their inner edges. It is understood that the distance between the inner edges of the first antenna element 11 and the second antenna element 12 may deviate within a certain range, provided that the isolation meets the requirements. For example, the preset distance d is approximately one-tenth of a wavelength at high frequencies (e.g., 5G bands), typically approximately 5 millimeters.

[0024] In some embodiments, the co-polarized dual-fed antenna is placed vertically in the device, with both antenna elements fed in the middle, a process known as center feeding, to radiate vertically polarized electromagnetic waves.

[0025] The second antenna element 12 includes a folded dipole 121, which can introduce an isolation pole in the 5G band, reducing the coupling between the two antenna elements. Furthermore, the folded dipole 121 can improve the matching of the second antenna element 12. The S-parameters are as follows: Figure 2 As shown. See also Figure 2 Curve S1,1 represents the return loss of the 5G band / first antenna element 11; curve S2,2 represents the return loss of the 2G band / second antenna element 12; curve S2,1 represents the isolation between the first antenna element 11 and the second antenna element 12. From Figure 2 It can be seen that an isolation pole (called the first pole) is generated in the 5GHz band, so that the maximum isolation can reach 26dB, and the -10dB bandwidth range of the second antenna unit 12 is 2.36GHz~2.51GHz, which meets the usage requirements.

[0026] Regarding the introduction of isolation poles: The folded dipole 121 in the 2G band has a second-order mode in the 5G band, and its radiation pattern will have a null in the horizontal direction. The maximum direction of the radiation pattern of the first antenna element 11 is exactly the same as the direction of the null of the radiation pattern of the second antenna element 12, so high isolation characteristics can be achieved, such as... Figure 3A and Figure 3B As shown.

[0027] In some embodiments, the folded oscillator 121 includes a fourth radiating segment 122, a fifth radiating segment 123, and a linear radiating segment 124. The fifth radiating segment 123 is L-shaped. The fourth radiating segment 122 and the fifth radiating segment 123 are separated by a second coupling gap. The fourth radiating segment 122 and the fifth radiating segment 123 are symmetrical about the second coupling gap 15. The second feed point 14 is located at the second coupling gap 15. The long side of the fourth radiating segment 122 and the long side of the fifth radiating segment 123 are arranged along the first direction Y. The short side of the fourth radiating segment 122 is located at the end of the fourth radiating segment 122 away from the second coupling gap 15. The two ends of the linear radiating segment 124 are connected to the outer ends of the short sides of the fourth radiating segment 122 and the fifth radiating segment 123, respectively.

[0028] In this embodiment, the copper plating width of the fourth radiating segment 122 and the fifth radiating segment 123 is greater than the copper plating width of the straight radiating segment 124. The second antenna element 12 includes a single, typical folded element 121. In other embodiments, the second antenna element 12 may include a partial folded element, a three-line / four-line λ / 2 folded element 121, a composite folded element, a dual folded element, etc.

[0029] In some embodiments, a third slit 16 is formed between the straight radiating segment 124 and the long side of the fourth radiating segment 122 and the long side of the fifth radiating segment 123. By changing the length L of the third slit 16 in the first direction, the frequency band of the first pole can be changed, while having almost no effect on the isolation of the 2G frequency band, such as... Figure 4 As shown. Figure 4 As can be seen, the frequency of the first isolation pole increases as the length L of the third slit 16 decreases, and the isolation increases.

[0030] In some embodiments, the plurality of radiation segments include two radiation segments 111 and 112 (reference). Figure 1 ) or three radiation segments (reference) Figure 5 113, 114, and 115 are multiple radiating segments arranged symmetrically relative to the first feed point 13. It is understood that the number of radiating segments is not limited to two or three; four or more can be set as needed to meet the requirement of more sub-bands having their own radiators.

[0031] Please see Figure 5 In some embodiments, the plurality of radiation segments include a first radiation segment 113, a second radiation segment 114 and a third radiation segment 115 arranged sequentially at intervals. The second radiation segment 114 includes a first sub-radiation segment 114a and a second sub-radiation segment 114b separated by a first coupling gap 17. The first sub-radiation segment 114a is arranged close to the first radiation segment 113, and the second sub-radiation segment 114b is arranged close to the third radiation segment 115. The first feed point 13 is located at the first coupling gap 17.

[0032] The first radiating segment 113 and the third radiating segment 115 are coupled to the second radiating segment 114, respectively. The first radiating segment 113 and the second radiating segment 114 are separated by a third coupling gap 18, and the second radiating segment 114 and the third radiating segment 115 are separated by a fourth coupling gap 19. The three radiating segments 113, 114, and 115 will generate a second isolation pole (called the second pole), as shown below. Figure 6 As shown. See also Figure 6Curve S1,1 represents the return loss of the 5G band / first antenna element 11; curve S2,2 represents the return loss of the 2G band / second antenna element 12; the blue line represents the isolation between the two ports, and curve S2,1 represents the isolation between the first antenna element 11 and the second antenna element 12. The introduction of the second pole extends the effective bandwidth of coupling suppression, from Figure 2 It can be seen that the isolation is greater than 20dB only in the 5.3GHz~5.6GHz frequency band near the first pole, while Figure 6 The isolation in the 5.2GHz~6.4GHz frequency band near the first and second poles is greater than 20dB.

[0033] For example, the third coupling slot 18 and the fourth coupling slot 19 have the same width in the first direction Y, which is called the coupling slot width. While maintaining the total length of the first antenna element 11 and the coupling slot width, the frequency of the second pole can be changed by altering the length L1 of the second radiating segment 114. Figure 7 As shown, the frequency of the second isolation pole decreases as the length L1 of the second radiation segment 114 decreases, while the isolation increases.

[0034] Please see Figure 8 In some embodiments, the first sub-radiating segment 114a has a first slit 114c, and the second sub-radiating segment 114b has a second slit 114d. The first slit 114c and the second slit 114d extend along the first direction Y and are symmetrical with respect to the first coupling gap 17. The first slit 114c and the second slit 114d are formed on the second radiating segment 114, introducing a third isolation pole (referred to as the third pole), such as... Figure 9 As shown. The introduction of the third pole further extends the effective bandwidth for coupling suppression. Figure 6 The isolation is greater than 20dB in the 5.2GHz~6.4GHz frequency band, while Figure 9 The isolation level in the 5GHz to 7GHz frequency band is greater than 20dB. For example... Figure 10 As shown, the first slit 114c and the second slit 114d (i.e. Figure 10 The slit (as indicated in the image) allows for antenna matching adjustment.

[0035] In some embodiments, the first slit 114c and the second slit 114d are semi-closed slits, with one end of the first slit 114c and one end of the second slit 114d respectively connected to the first coupling gap 17. In other embodiments, taking the first slit 114c as an example, both ends can extend out of the first sub-radiating segment 114a, respectively connecting the third coupling gap and the first coupling gap 17, or extending out in a direction perpendicular to the first direction Y.

[0036] In some embodiments, the second slit 114d is L-shaped, meaning the first slit 114c is an inverted L-shape. In other embodiments, the second slit 114d can be straight or other bent shapes, such as a serpentine shape.

[0037] Please see Figure 11 In some embodiments, the fourth radiating segment 122 has a first groove 122a on the side opposite to the first antenna unit 11, and the fifth radiating segment 123 has a second groove 123a on the side opposite to the first antenna unit 11.

[0038] For example, the two grooves are rectangular. The position of the rectangular grooves can be aligned with the center of the coupling slot of the first antenna element 11, that is, the first groove 122a is directly opposite the third coupling slot 18, and the second groove 123a is directly opposite the fourth coupling slot 19. Of course, they can also be located in other positions.

[0039] The changes in isolation between the fourth radiation section 122 and the fifth radiation section 123 before and after slotting are as follows: Figure 12 As shown, the isolation near the 5.5GHz band has increased from 20dB to 27dB, which improves coupling suppression throughout the entire band.

[0040] The S-parameters of a co-polarized doubly-fed antenna are as follows: Figure 13 As shown. Figure 13 In the diagram, curve S1,1 represents the return loss of the 5G band / first antenna element 11; curve S2,2 represents the return loss of the 2G band / second antenna element 12; the blue line represents the isolation between the two ports, and curve S2,1 represents the isolation between the first antenna element 11 and the second antenna element 12. The bandwidths of the first antenna element 11 and the second antenna element 12 meet the usage requirements, and the out-of-band coupling suppression level, i.e., the inter-frequency isolation, is greater than 25dB.

[0041] Antenna pattern as follows Figure 14A and Figure 14B As shown, there is no distortion. Figure 14A The radiation pattern of the second antenna unit 12 at 2.4 GHz is shown. Figure 14B The radiation pattern of the first antenna element 11 at 5.5 GHz.

[0042] Secondly, embodiments of this application provide an electronic device, including the co-polarized dual-fed antenna as described above.

[0043] Both antenna elements of a co-polarized doubly fed antenna can radiate vertically polarized electromagnetic waves and have strong out-of-band coupling suppression, meaning that there is high isolation between the two antenna elements. Moreover, the two antennas can still work well when placed close to the metal plate (e.g., the device casing) of electronic equipment.

[0044] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A co-polarized doubly-fed antenna, characterized in that, The antenna unit includes a first antenna element operating in a first frequency band and a second antenna element operating in a second frequency band. The first antenna element and the second antenna element both extend along a first direction and are separated by a preset distance. A first feed point is provided at the middle position of the first antenna element, and the first antenna element includes multiple radiating segments arranged at intervals. The second antenna element includes a folded vibrator extending along the first direction and a second feed point is provided at the middle position.

2. The co-polarized doubly-fed antenna as described in claim 1, characterized in that, The plurality of radiation segments include two or three radiation segments, and the plurality of radiation segments are arranged symmetrically relative to the first feed point.

3. The co-polarized dual-fed antenna as described in claim 1, characterized in that, The plurality of radiation segments include a first radiation segment, a second radiation segment, and a third radiation segment arranged sequentially at intervals. The second radiation segment includes a first sub-radiation segment and a second sub-radiation segment separated by a first coupling gap. The first sub-radiation segment is arranged close to the first radiation segment, and the second sub-radiation segment is arranged close to the third radiation segment. The first feed point is located at the first coupling gap.

4. The co-polarized dual-fed antenna as described in claim 3, characterized in that, The first sub-radiating segment has a first slit, and the second sub-radiating segment has a second slit. The first slit and the second slit extend along the first direction and are symmetrical with respect to the first coupling gap.

5. The co-polarized dual-fed antenna as described in claim 4, characterized in that, The first slit and the second slit are semi-closed slits, and one end of the first slit and one end of the second slit are respectively connected to the first coupling gap.

6. The co-polarized dual-fed antenna as described in any one of claims 1 to 5, characterized in that, The folded oscillator includes a fourth radiating segment, a fifth radiating segment, and a linear radiating segment. The fifth radiating segment is L-shaped and separated from the fourth radiating segment by a second coupling gap. The fourth and fifth radiating segments are symmetrical about the second coupling gap. The second feed point is located at the second coupling gap. The long sides of the fourth and fifth radiating segments are arranged along the first direction. The short side of the fourth radiating segment is located at the end of the fourth radiating segment away from the second coupling gap. The two ends of the linear radiating segment are connected to the outer ends of the short sides of the fourth and fifth radiating segments, respectively.

7. The co-polarized dual-fed antenna as described in claim 6, characterized in that, A third slit is formed between the straight radiating segment and the long side of the fourth radiating segment and the long side of the fifth radiating segment.

8. The co-polarized dual-fed antenna as described in claim 6, characterized in that, The fourth radiating segment has a first groove on the side opposite to the first antenna unit, and the fifth radiating segment has a second groove on the side opposite to the first antenna unit.

9. The co-polarized dual-fed antenna as described in claim 8, characterized in that, The plurality of radiation segments include a first radiation segment, a second radiation segment, and a third radiation segment arranged sequentially at intervals. The first radiation segment and the second radiation segment are separated by a third coupling gap, and the second radiation segment and the third radiation segment are separated by a fourth coupling gap. The first groove is directly opposite to the third coupling gap, and the second groove is directly opposite to the fourth coupling gap.

10. An electronic device, characterized in that, Including the co-polarized dual-fed antenna as described in any one of claims 1 to 9.

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