Multi-band antennas and wireless devices

Abstract

The present invention relates to the field of antenna technology, specifically disclosing a multi-band antenna and wireless device, comprising a circuit board and a first antenna and a second antenna vertically disposed on the same surface of the circuit board. The first antenna and the second antenna support different frequency bands and are spaced apart. The first antenna includes a semi-enclosed structure and a first connecting section connecting the semi-enclosed structure to the circuit board, with an opening of the semi-enclosed structure opening toward one side of the second antenna. This arrangement improves isolation between the first and second antennas, achieving good dual-band performance while also reducing the overall spatial dependency of the product.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and particularly discloses a multi-band antenna and a wireless device. Background Art

[0002] In real life, with the development of information technology and the advancement of science and technology, wireless devices are increasingly entering our lives, and various wireless devices also put forward higher requirements for antenna design.

[0003] Communication antennas used in smart home devices must support LoRa, BT, and WiFi. Each antenna has its own unique operating frequency band, so isolation between different antennas must be ensured to reduce interference. Maximizing the use of shared antennas can also significantly reduce costs. While ensuring isolation between antennas, reducing the distance between antennas can also significantly reduce space requirements. Summary of the Invention

[0004] The main purpose of the present invention is to provide a multi-band antenna and a wireless device, aiming to provide a multi-band antenna with high isolation and small size.

[0005] To achieve the above-mentioned objectives, the first aspect of the present invention proposes a multi-band antenna, comprising a circuit board and a first antenna and a second antenna vertically arranged on the same surface of the circuit board, wherein the first antenna and the second antenna support different frequency bands, the first antenna and the second antenna are arranged at intervals, the first antenna includes a semi-enclosed structure and a first connecting section connecting the semi-enclosed structure to the circuit board, and the opening of the semi-enclosed structure is open toward one side of the second antenna.

[0006] A second aspect of the present invention provides a wireless device including the multi-band antenna as described above.

[0007] In addition, the multi-band antenna of the present invention may also have the following additional technical features.

[0008] According to one embodiment of the present invention, the first antenna supports the full frequency band of LoRa and the full frequency band of BT, and the second antenna supports the full frequency band of WiFi.

[0009] According to one embodiment of the present invention, the low frequency band of the first antenna is 863-928 MHz, the high frequency band of the first antenna is 2400-2500 MHz, the low frequency band of the second antenna is 2400-2500 MHz, and the high frequency band of the second antenna is 5150-5850 MHz.

[0010] According to one embodiment of the present invention, the plane where the first antenna is located is perpendicular to the plane where the circuit board is located, and the projection of the first antenna on the circuit board coincides with the first edge of the circuit board.

[0011] According to one embodiment of the present invention, the plane where the second antenna is located is perpendicular to the plane where the circuit board is located, and the projection of the second antenna on the circuit board is perpendicular to the projection of the first antenna on the circuit board.

[0012] According to one embodiment of the present invention, the semi-enclosed structure is in a broken line shape or an arc shape.

[0013] According to one embodiment of the present invention, the semi-enclosed structure includes a first horizontal section, a first inclined section, a second horizontal section and a second inclined section connected in sequence, wherein the first connecting section is vertically connected to the first horizontal section and the circuit board respectively, the first inclined section extends obliquely in a direction away from the second antenna, and the second inclined section extends obliquely in a direction close to the second antenna.

[0014] According to an embodiment of the present invention, the first connecting section is connected to the circuit board via a metal spring.

[0015] According to one embodiment of the present invention, the minimum spatial distance between the second antenna and the first antenna is 15 mm.

[0016] According to one embodiment of the present invention, the length of the first antenna is 80-100 mm, the line width of the first antenna is 2 mm, the thickness of the first antenna is 0.5 mm, the height of the first antenna is 20 mm, and the projected length of the first antenna on the circuit board is 50 mm.

[0017] According to an embodiment of the present invention, the sum of the projected lengths of the first horizontal segment, the first inclined segment, and the first connecting segment on the circuit board is 1 / 2 of the first edge length.

[0018] According to one embodiment of the present invention, the second antenna includes a second connecting section, an L-shaped first resonant branch and a U-shaped second resonant branch, the end of the L-shaped first resonant branch is formed as a feeding end, and the first resonant branch and the second resonant branch intersect at the top of the second connecting section.

[0019] According to one embodiment of the present invention, the second antenna has a height of 15-25 mm, a length of 20 mm, and a thickness of 0.5 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By arranging a first antenna and a second antenna supporting different frequency bands on the same surface of the circuit board at intervals, and configuring the first antenna to be a semi-enclosed structure with its opening opening toward the second antenna, the isolation between the first antenna and the second antenna is improved, achieving better dual-band working performance, while also reducing the overall spatial dependence of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 is a three-dimensional diagram of a multi-band antenna according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 for Figure 1 Side view Figure 1 ;

[0026] Figure 4 for Figure 1 Side view Figure 2 .

[0027] Reference numerals:

[0028] Multi-band antenna 100, circuit board 10, long side 101, short side 102, first antenna 11, semi-enclosed structure 110, first horizontal section 110a, first inclined section 110b, second horizontal section 110c, second inclined section 110d, first connecting section 111, second antenna 12, second connecting section 120, first resonant branch 121, second resonant branch 122, feeding end 123, and metal dome 13.

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0033] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Refer to the following Figure 1-4 A multi-band antenna 100 according to some embodiments of the present invention is described.

[0036] like Figure 1-4 As shown, an embodiment of the present invention provides a multi-band antenna, which is mainly used in wireless devices. The multi-band antenna 100 includes a circuit board 10 and a first antenna 11 and a second antenna 12 vertically arranged on the same surface of the circuit board 10, wherein the first antenna 11 and the second antenna 12 support different frequency bands, and the first antenna 11 and the second antenna 12 are arranged at intervals. The first antenna 11 includes a semi-enclosed structure 110 and a first connecting section 111 connecting the semi-enclosed structure 110 to the circuit board 10, and the opening of the semi-enclosed structure 110 is open toward one side of the second antenna 12.

[0037] Specifically, in this embodiment, the circuit board 10 can be rectangular, and the circuit board 10 has a long side 101 and a short side 102, wherein the plane where the first antenna 11 is located is arranged perpendicular to the plane where the circuit board 10 is located, and the projection of the first antenna 11 on the circuit board 10 coincides with the short side 102 of the circuit board 10, and the plane where the second antenna 12 is located is arranged perpendicular to the plane where the circuit board 10 is located, and the projection of the second antenna 12 on the circuit board 10 is parallel to the long side 101 of the circuit board 10, and the projection of the second antenna 12 on the circuit board 10 is located on the inner side of the long side 101 of the circuit board 10, so that the extension line of the projection of the first antenna 11 on the circuit board 10 and the extension line of the projection of the second antenna 12 on the circuit board 10 are perpendicular to each other.

[0038] In one embodiment of the present invention, the first antenna 11 can support the LoRa full frequency band and the BT full frequency band. Specifically, the low frequency band of the first antenna 11 is 863-928 MHz, and the high frequency band of the first antenna 11 is 2400-2500 MHz.

[0039] Furthermore, the semi-enclosed structure 110 of the first antenna 11 is in a broken line or arc shape. Figure 1 The semi-enclosed structure 110 is in a broken line shape. Specifically, the semi-enclosed structure 110 and the first connecting segment 111 constitute a first antenna 11 with five broken line segments, wherein the total length of the first antenna 11 is approximately 80-100 mm, its height is 20 mm, the maximum width is 50 mm, the line width is 2 mm, and the thickness is 0.5 mm. The projected length of the first antenna 11 on the circuit board 10 is 50 mm.

[0040] Specifically, continue to refer to Figure 3 The semi-enclosed structure 110 includes a first horizontal section 110a, a first inclined section 110b, a second horizontal section 110c, and a second inclined section 110d, which are connected in sequence. The first connecting section 111 is perpendicularly connected to the first horizontal section 110a and the circuit board 10, and the second inclined section 110d extends obliquely toward the second antenna 12. The length of the first connecting section 111 is 7 mm, and the length of the first horizontal section 110a is 14 mm. It should be noted that the dimensions of the first connecting section 111 and the first horizontal section 110a enable the first antenna 11 to operate in the 2400-2500 MHz BT operating frequency band. Furthermore, the first inclined section 110b extends obliquely 7 mm away from the second antenna 12, which ensures high isolation between the first antenna 11 and the second antenna 12 and achieves good dual-band performance.

[0041] In addition, the sum of the projected lengths of the first horizontal section 110 a , the first inclined section 110 b , and the first connecting section 111 on the circuit board 10 is ½ of the length of the short side of the circuit board 10 .

[0042] In the embodiment of the present invention, continue to refer to Figure 3 The first connecting section 111 is connected to the circuit board 10 via the metal spring 13. It should be noted that the first connecting section 111 and the circuit board 10 can also be connected via other contact structures, such as welding or other methods, which will not be described in detail in this embodiment.

[0043] It's worth noting that the minimum spatial distance between the second antenna 12 and the first antenna 11 is 15mm. Specifically, the first antenna 11 and the second antenna 12 each have a point closest to each other, and the line connecting these two points represents this minimum distance. This arrangement shortens the distance between the first antenna 11 and the second antenna 12, reducing the complexity of the circuit board 10 layout. Compared to traditional high-isolation antenna combinations, it eliminates the need to connect the two antennas to distant ends, thus avoiding the need for additional transmission lines.

[0044] In this embodiment, continue to refer to Figure 4 , the second antenna 12 can support the full frequency band of WiFi. Specifically, the low frequency of the second antenna 12 is 2400MHz~2500MHz, and the high frequency band of the second antenna 12 is 5150MHz~5850MHz. Among them, the height of the second antenna 12 is 10mm, the length is 15-25mm, and the thickness is 0.5mm. The second antenna 12 includes a second connecting section 120, an L-shaped first resonant branch 121 and a U-shaped second resonant branch 122. The end of the L-shaped first resonant branch 121 is formed as a feeding end 123. The first resonant branch 121 and the second resonant branch 122 intersect at the top of the second connecting section 120.

[0045] It should be noted that the feed end 123 can be soldered to the RF circuit end on the circuit board 10. The first resonant branch 121 is a resonant branch for the 5 GHz frequency band, enabling the second antenna 12 to meet the performance requirements of the 5150 MHz to 5850 MHz operating frequency band. The second resonant branch 122 is a resonant branch for the 2.4 GHz frequency band, enabling the second antenna 12 to meet the performance requirements of the 2400 MHz to 2500 MHz operating frequency band. The second connecting section 120 is an antenna impedance tuning grounding unit, enabling the second antenna 12 to meet the 50 ohm impedance matching requirement.

[0046] Another embodiment of the present invention provides a wireless device, wherein the multi-band antenna 100 of the present invention is applied to various wireless devices such as mobile phones and tablet computers. The wireless device includes the multi-band antenna 100 as described in the above embodiment.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-band antenna, characterized in that: The invention comprises a circuit board and a first antenna and a second antenna vertically arranged on the same surface of the circuit board, wherein the first antenna and the second antenna support different frequency bands and are spaced apart from each other. The first antenna comprises a semi-enclosed structure and a first connecting section connecting the semi-enclosed structure to the circuit board, and an opening of the semi-enclosed structure opens toward one side of the second antenna. The semi-enclosed structure includes a first horizontal section, a first inclined section, a second horizontal section, and a second inclined section connected in sequence, wherein the first connecting section is vertically connected to the first horizontal section and the circuit board respectively, the first inclined section extends obliquely in a direction away from the second antenna, and the second inclined section extends obliquely in a direction close to the second antenna; The second antenna includes a second connecting section, an L-shaped first resonant branch and a U-shaped second resonant branch. The second connecting section is an antenna impedance tuning grounding unit. The end of the L-shaped first resonant branch is formed as a feeding end. The first resonant branch and the second resonant branch intersect at the top of the second connecting section.

2. The multi-band antenna according to claim 1, wherein: The first antenna supports LoRa full frequency band and BT full frequency band, and the second antenna supports WiFi full frequency band.

3. The multi-band antenna according to claim 2, wherein: The low frequency band of the first antenna is 863-928 MHz, the high frequency band of the first antenna is 2400-2500 MHz, the low frequency band of the second antenna is 2400-2500 MHz, and the high frequency band of the second antenna is 5150-5850 MHz.

4. The multi-band antenna according to claim 1, wherein: The plane where the first antenna is located is perpendicular to the plane where the circuit board is located, and the projection of the first antenna on the circuit board coincides with a first edge of the circuit board.

5. The multi-band antenna according to claim 4, wherein: The plane where the second antenna is located is perpendicular to the plane where the circuit board is located, and the projection of the second antenna on the circuit board is perpendicular to the projection of the first antenna on the circuit board.

6. The multi-band antenna according to claim 1, wherein: The first connecting section is connected to the circuit board via a metal spring.

7. The multi-band antenna according to claim 5, wherein: The minimum spatial distance between the second antenna and the first antenna is 15 mm.

8. The multi-band antenna according to claim 7, wherein: The length of the first antenna is 80-100 mm, the line width of the first antenna is 2 mm, the thickness of the first antenna is 0.5 mm, the height of the first antenna is 20 mm, and the projected length of the first antenna on the circuit board is 50 mm.

9. The multi-band antenna according to claim 8, wherein: The sum of the projected lengths of the first horizontal segment, the first inclined segment, and the first connecting segment on the circuit board is 1 / 2 of the first edge length.

10. The multi-band antenna according to claim 1, wherein: The second antenna has a height of 10 mm, a length of 15-25 mm, and a thickness of 0.5 mm.

11. A wireless device, characterized in that: The invention comprises the multi-band antenna according to any one of claims 1 to 10.

Images