Multifrequency antenna

Abstract

A multi-frequency antenna includes a first radiator, a feed-in element, a first ground element, a second radiator, a cross-over element, and a second ground element. The first radiator is made of a metal plate. The feed-in element is electrically connected to the first radiator and is used to feed in a signal. The first ground element is electrically connected to the first radiator. The second radiator is made of a metal plate. The second radiator surrounds the first radiator and is separated from the first radiator by a distance. The cross-over element is electrically connected to the first radiator and the second radiator. The second ground element is electrically connected to the second radiator. Thus, the multi-frequency antenna is suitable for transmitting signals of multiple frequency bands.

Description

Technical Field

[0001] This invention relates to metal antennas; in particular, it refers to a multi-frequency antenna applicable to multiple frequency bands. Background Technology

[0002] With the development of technology, the application of wireless signals is becoming more and more common. Taking wireless communication products as an example, most existing wireless communication products, such as mobile phones, tablet computers, and laptops, use metal antennas to transmit and receive wireless signals. The most widely used frequency bands for metal antennas are 2.4GHz or 5GHz. With the development of WiFi 6E products, the application of the 6GHz frequency band has been added.

[0003] The metal antennas of WiFi 6E wireless communication products mostly use planar inverted F antennas or monopole antennas, which are applicable to a single frequency band. Therefore, WiFi 6E wireless communication products need multiple antennas to be applicable to multiple frequency bands. As a result, the volume occupied by multiple antennas increases, which in turn increases the overall size of the wireless communication product. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a multi-frequency antenna that is applicable to multi-band wireless communication products.

[0005] To achieve the above objectives, the present invention provides a multi-frequency antenna, comprising a first radiator, a feed member, a first ground member, a second radiator, a bridging member, and a second ground member. The first radiator is made of a metal plate. The feed member is electrically connected to the first radiator and supplies a feed signal. The first ground member is electrically connected to the first radiator and grounds the first radiator. The second radiator is made of a metal plate and surrounds a portion of the periphery of the first radiator, with a gap between the first radiator and the second radiator. The bridging member is electrically connected to the first radiator and the second radiator. The second ground member is electrically connected to the second radiator and grounds the second radiator.

[0006] The advantage of this invention is that it allows signals to be fed in by a single feeder and has two radiators that can be used to transmit signals in multiple frequency bands, effectively improving upon the shortcomings of conventional wireless communication products that require multiple antennas. Attached Figure Description

[0007] Figure 1 This is a perspective view of a multi-frequency antenna according to a first preferred embodiment of the present invention.

[0008] Figure 2 This is a top view of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0009] Figure 3 This is a front view of a multi-frequency antenna according to a first preferred embodiment of the present invention.

[0010] Figure 4 This is a rear view of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0011] Figure 5 This is a left-side view of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0012] Figure 6 This is a right-side view of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0013] Figure 7 This is a bottom view of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0014] Figure 8 The return loss curve of the multi-frequency antenna operating at 2-8 GHz according to the first preferred embodiment of the present invention is shown.

[0015] Figure 9 This is a top view of another orientation of the multi-frequency antenna according to the first preferred embodiment of the present invention.

[0016] Figure 10 The radiation pattern diagram of the multi-frequency antenna operating at 2.45 GHz according to the first preferred embodiment of the present invention.

[0017] Figure 11 The radiation pattern diagram of the multi-frequency antenna operating at 5.5 GHz according to the first preferred embodiment of the present invention.

[0018] Figure 12 The radiation pattern diagram of the multi-frequency antenna operating at 6.5 GHz according to the first preferred embodiment of the present invention is shown.

[0019] Figure 13 This is a perspective view of a multi-frequency antenna according to a second preferred embodiment of the present invention.

[0020] Figure 14 This is a top view of a multi-frequency antenna according to a second preferred embodiment of the present invention.

[0021] Figure 15 This is a front view of a multi-frequency antenna according to a second preferred embodiment of the present invention.

[0022] Figure 16 This is a rear view of the multi-frequency antenna according to the second preferred embodiment of the present invention.

[0023] Figure 17 This is a left-side view of a multi-frequency antenna according to a second preferred embodiment of the present invention.

[0024] Figure 18This is a right-side view of a multi-frequency antenna according to a second preferred embodiment of the present invention.

[0025] Figure 19 This is a bottom view of the multi-frequency antenna according to the second preferred embodiment of the present invention. Detailed Implementation

[0026] To more clearly illustrate the present invention, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figures 1 to 7 As shown, the multi-frequency antenna 1 of the first preferred embodiment of the present invention includes a first radiator 10, a feed element 12, a first grounding element 14, a second radiator 16, a bridging element 18, and a second grounding element 20. In this embodiment, the multi-frequency antenna 1 is used as an example in a WiFi wireless communication device, and its frequency band can be 2GHz, 5GHz, 6GHz, etc. For ease of explanation, a first axis X, a second axis Y, and a third axis Z that are perpendicular to each other are defined.

[0027] The first radiator 10 is made of a metal plate. In this embodiment, the first radiator 10 is a triangular metal plate, such as an isosceles triangle, but not limited thereto. The first radiator 10 has an edge 102, i.e., the base of the triangle. The width of the first radiator 10 along the first axis X gradually decreases from the edge 102 along the second axis Y to the other end. The first radiator 10 has a first surface 10a and a second surface 10b facing each other along the third axis Z. The first surface 10a faces the outside of the multi-frequency antenna 1. The length L of the first radiator 10 along the second axis Y is approximately 16.77 mm, and the width W of the edge 102 is approximately 8.1 mm.

[0028] The feed element 12 is electrically connected to the first radiator 10, and the feed element 12 provides a feed signal. In this embodiment, the feed element 12 is a metal plate located on one side of the second surface 10b. One end of the feed element 12 is connected to the second surface 10b, and the other end provides a feed signal. The width of the feed element 12 extends along the first axial direction X, and the length extends along the third axial direction Z.

[0029] The first grounding element 14 is electrically connected to the first radiator 10, and provides grounding for the first radiator 10. In this embodiment, the first grounding element 14 is a metal plate and is located on one side of the second surface 10b, that is, both the first grounding element 14 and the feed element 12 are located beside the second surface 10b. One end of the first grounding element 14 is connected to the second surface 10b. The first grounding element 14 and the feed element 12 are separated by a distance D along the second axial direction Y, where D is approximately 10.2 mm. The width direction of the first grounding element 14 extends along the first axial direction X, and the length direction extends along the third axial direction Z.

[0030] The second radiator 16 is made of a metal sheet and surrounds a portion of the periphery of the first radiator 10. A gap exists between the inner periphery of the second radiator 16 and the outer periphery of the first radiator 10. In this embodiment, the second radiator 16 is recessed along a second axial direction Y to form a receiving groove 162. The receiving groove 162 has an open side 162a and a closed side 162b opposite to each other along the second axial direction Y. The width of the receiving groove 162 along the first axial direction X gradually decreases from the open side 162a to the closed side 162b. At least a portion of the first radiator 10 is located in the receiving groove 162, and its edge 102 corresponds to the open side 162a. The width of the first radiator 10 also gradually decreases from the open side 162a to the closed side 162b. More specifically, the second radiator 16 includes a first arm 164 and a second arm 166. The first arm 164 and the second arm 166 are located on opposite sides of the first radiator 10 along the first axial direction X and are V-shaped. The space between the first arm 164 and the second arm 166 forms the receiving groove 162. The first arm 164 and the second arm 166 surround a portion of the first radiator 10, and the first arm 164 and the second arm 166 are spaced apart from and parallel to the two sides of the first radiator 10. One end of the first arm 164 is connected to one end of the second arm 166 to form the closed side 162a of the receiving groove 162, and the other end of the first arm 164 and the other end of the second arm 166 form the open side 162a of the receiving groove 162. The edge 102 of the first radiator 10 is flush with the other end of the first arm 164 and the other end of the second arm 166 in the second axial direction Y, but this is not a limitation; it may also slightly protrude beyond the open side 162a or slightly retract into the receiving groove 162. The distance D1 between the two ends of the edge 102 of the first radiator 10 in the first axial direction X and the first arm 164 and the second arm 166 is approximately 1.52 mm, and the distance D1 is equal to the distance between the inner periphery of the second radiator 16 and the outer periphery of the first radiator 10.

[0031] The second radiator 16 has a third surface 16a and a fourth surface 16b facing each other along the third axis Z. The third surface 16a faces outward of the multi-frequency antenna 1, that is, the third surface 16a of the second radiator 16 and the first surface 10a of the first radiator 10 face the same direction. The length L1 of the second radiator 16 along the second axis Y is approximately 25.5 mm. The width W1 of one end of the second radiator 16 along the second axis Y is approximately 21.5 mm, and the width W2 of the other end is approximately 7.8 mm.

[0032] The bridging member 18 electrically connects the first radiator 10 and the second radiator 16 to conduct resonant current. In this embodiment, the bridging member 18 is located on one side of the second surface 10b and the fourth surface 16b, and both ends of the bridging member 18 are connected to the second surface 10b and the fourth surface 16b, respectively. This prevents the bridging member 18 from affecting the radiation of the first radiator 10 and the second radiator 16 in the horizontal plane (XY plane). More specifically, the bridging member 18 has two longitudinal segments 182 and 184 and a transverse segment 186. Each longitudinal segment 182 and 184 extends along the third axis Z. One end of one of the longitudinal segments 182 is located in the second axis Y between the edge of the feed member 12 and the first radiator 10, and one end of the other longitudinal segment 184 is connected to the first arm 164. The distance D2 between the two longitudinal segments 182 and 184 in the first axis X is approximately 5 mm. The transverse segment 186 extends along the first axial direction X, and the two ends of the transverse segment 186 are respectively connected to the other ends of the two longitudinal segments 182 and 184.

[0033] The second grounding member 20 is electrically connected to the second radiator 16, and provides grounding for the second radiator 16. In this embodiment, the second grounding member 20 is a metal plate located on one side of the fourth surface 16b of the second radiator 16. One end of the second grounding member 20 is connected to the fourth surface 16b on the second arm 166 of the second radiator 16, and along the second axial direction Y, the second grounding member 20 is located between the first grounding member 14 and the feed member 12. The second grounding member 20 and the first grounding member 14 are electrically connected to ground.

[0034] In this embodiment, the multi-frequency antenna 1 further includes a carrier plate 22, which provides grounding for the first grounding member 14 and the second grounding member 20. The carrier plate 22 is exemplified by a metal plate, but is not limited thereto; it can also be a printed circuit board. One surface 22a of the carrier plate 22 is spaced apart from the second surface 10b and the fourth surface 16b along the third axis Z, and the other surface of the carrier plate 22 is attached to a circuit board 24. The first grounding member 14 is connected between the carrier plate 22 and the second surface 10b of the first radiator 10, and the second grounding member 20 is connected between the carrier plate 22 and the fourth surface 16b of the second arm 166 of the second radiator 16. The distance D3 from the surface 22a of the carrier plate 22 to the second surface 10b and the fourth surface 16b along the third axis Z is approximately 4.5–5 mm; in this embodiment, D3 is approximately 4.6 mm.

[0035] The first grounding member 14 supports the first radiator 10 on the carrier plate 22, and the second grounding member 20 supports the second radiator 16 on the carrier plate 22. That is, the first radiator 10 is supported on the carrier plate 22 only by the first grounding member 14, and the second radiator 16 is supported on the carrier plate 22 only by the second grounding member 20. The first radiator 10 and the second radiator 16 are not directly connected to the carrier plate 22 through other supporting members.

[0036] The feeder 12 forms a high-frequency (above 4.5 GHz) resonant current path from the first radiator 10 to the first grounding member 14, and forms a low-frequency (2-3 GHz) resonant current path from the feeder 12 to the second grounding member 20 via the jumper 18, the first arm 164, the second arm 166.

[0037] Figure 8 The diagram shows the S11 return loss curves of the multi-frequency antenna 1 operating in the 2–8 GHz frequency band. It exhibits a resonant mode in the 2.4 GHz band, and broadband resonant modes with approximately 38% bandwidth in the 5 GHz and 6 GHz bands. Figure 8 It is known that the multi-frequency antenna 1 covers frequency bands that support WiFi 6E and WiFi 7, namely 2.4-2.5GHz, 5.15-5.85GHz, and 5.925-7.125GHz.

[0038] Please cooperate. Figures 9-12 ,in Figures 10-12 They are respectively the corresponding Figure 9 Radiation field patterns on the horizontal plane when the device is positioned and operated at 2.45 GHz, 5.5 GHz, and 6.5 GHz. (From...) Figures 10-12 It is known that the multi-frequency antenna 1 has omnidirectional characteristics in the three frequency bands of 2.45GHz, 5.5GHz and 6.5GHz, and can be used in a variety of wireless communication products.

[0039] Figures 13 to 19The multi-frequency antenna 2 shown is a second preferred embodiment of the present invention. It has a structure substantially the same as the first embodiment, also including a first radiator 30, a feed member 32, a first ground member 34, a second radiator 36, a bridging member 38, a second ground member 40, and a carrier plate 42. The difference is that the first radiator 30 is a long rectangular metal plate, and the width of the first radiator 30 along the second axis Y is the same as that of the feed member 32. The second radiator 36 includes a first arm 362, a second arm 364, and a connecting segment 366. The first arm 362 and the second arm 364 are parallel and extend along the second axis Y. The connecting segment 366 extends along the first axis X and connects the first arm 362 and the second arm 364 at both ends, respectively, so that the second radiator 36 has a shape with three surrounding edges and an open side 368a. One end of the bridging member 38 is located between the feed member 32 and the first ground member 34 along the second axis Y, and is close to the feed member 32. The second grounding element 40 is connected to the second arm 364 near the connecting section 366. The edge 302 of the first radiator 30 protrudes from the open side 368a of the accommodating groove 368 of the second radiator 36 by 0.5 mm, but is not limited thereto.

[0040] In this embodiment, L = 17.225mm, W = 3mm, D = 9.95mm, L1 = 23.75mm, W1 = 21mm, W2 = 21mm, D1 = 4mm, D2 = 6.125mm, and D3 = 5mm, but are not limited to the aforementioned dimensions. The multi-frequency antenna 2 can also be applied to the three frequency bands of 2.4–2.5GHz, 5.15–5.85GHz, and 5.925–7.125GHz, and has omnidirectional characteristics.

[0041] In addition to being a V-shaped metal plate or a metal plate with three surrounding edges, the second radiator in the above embodiments may also be a metal plate with a groove, such as a semi-circular or oval shape, surrounding the periphery of the first radiator.

[0042] As described above, the multi-frequency antenna of the present invention is fed with a signal by a single feed element and has two radiators suitable for transmitting signals in multiple frequency bands, applicable to multiple frequency bands from 2GHz, 5GHz, 6GHz to even 7GHz, and has good omnidirectional characteristics, making it suitable for various wireless communication products. It effectively addresses the shortcomings of conventional wireless communication products that require multiple antennas.

[0043] The above description is only a preferred and feasible embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the claims should be included within the patent scope of the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 1: Multi-frequency antenna

[0046] 10: First radiator

[0047] 10a: First surface

[0048] 10b: Second surface

[0049] 102: Edge

[0050] 12: Feeding component

[0051] 14: First grounding component

[0052] 16: Second radiator

[0053] 16a: Third surface

[0054] 16b: Fourth surface

[0055] 162: Container

[0056] 162a: Open side

[0057] 162b: Closed side

[0058] 164: First Arm

[0059] 166: Second Arm

[0060] 18: Jumper

[0061] 182: Longitudinal segment

[0062] 184: Longitudinal segment

[0063] 186: Horizontal segment

[0064] 20: Second grounding component

[0065] 22: Carrier board

[0066] 22a: Surface

[0067] 24: Circuit board

[0068] 2: Multi-frequency antenna

[0069] 30: First radiator

[0070] 302: Edge

[0071] 32: Feeding component

[0072] 34: First grounding component

[0073] 36: Second radiator

[0074] 362: First Arm

[0075] 364: The Second Arm

[0076] 366: Connector segment

[0077] 368: Container

[0078] 368a: Open side

[0079] 38: Jumper

[0080] 40: Second grounding component

[0081] 42: Carrier board

[0082] D, D1, D2: Distance

[0083] L, L1: Length

[0084] W, W1, W2: Width

[0085] X: First axis

[0086] Y: Second axis

[0087] Z: Third axis

Claims

1. A multi-frequency antenna, comprising: The first radiator is made of a metal sheet; A feeder is electrically connected to the first radiator, and the feeder supplies a feed signal; A first grounding component is electrically connected to the first radiator, and the first grounding component provides grounding for the first radiator; A second radiator, made of a metal sheet, surrounds a portion of the periphery of the first radiator, with a gap between the two radiators; the second radiator has a receiving groove having an open side and a closed side, and at least a portion of the first radiator is located in the receiving groove; the width of the receiving groove gradually decreases from the open side to the closed side; the width of the first radiator also gradually decreases from the open side to the closed side. A jumper connector electrically connects the first radiator and the second radiator; and A second grounding component is electrically connected to the second radiator, and the second grounding component provides grounding for the second radiator.

2. A multi-frequency antenna, comprising: A first radiator, made of a metal sheet, having an edge; A feeder is electrically connected to the first radiator, and the feeder supplies a feed signal; A first grounding component is electrically connected to the first radiator, and the first grounding component provides grounding for the first radiator; A second radiator, made of a metal sheet, surrounds a portion of the periphery of the first radiator, and the first radiator and the second radiator are separated by a gap; the second radiator has a cavity, the cavity having an open side and a closed side, at least a portion of the first radiator being located in the cavity; the edge protrudes from the open side of the cavity; A jumper connector electrically connects the first radiator and the second radiator; as well as A second grounding component is electrically connected to the second radiator, and the second grounding component provides grounding for the second radiator.

3. A multi-frequency antenna, comprising: A first radiator is made of a metal sheet and has a first surface and a second surface facing away from each other. A feeder is electrically connected to the first radiator, and the feeder supplies a feed signal; A first grounding element is electrically connected to the first radiator, and the first grounding element provides grounding for the first radiator. The feed element and the first grounding element are located on one side of the second surface and connected to the second surface. A second radiator, made of a metal sheet, surrounds a portion of the periphery of the first radiator, and the first radiator and the second radiator are separated by a gap; the second radiator has a third surface and a fourth surface facing away from each other, the first surface and the third surface facing the same direction; the second radiator includes a first arm and a second arm, the first arm and the second arm being located on opposite sides of the first radiator; A jumper is provided to electrically connect the first radiator and the second radiator, with one end of the jumper connected to the first arm; as well as A second grounding element is electrically connected to the second radiator, and the second grounding element provides grounding for the second radiator; the second grounding element is located on one side of the fourth surface and connected to the fourth surface, and the second grounding element is connected to the second arm.

4. The multi-frequency antenna as described in claim 3, wherein, The jumper is located on one side of the second surface and the fourth surface, and the two ends of the jumper are respectively connected to the second surface and the fourth surface.

5. The multi-frequency antenna as described in claim 4, wherein, The jumper has two longitudinal segments and one transverse segment, one end of one of the longitudinal segments is connected to the second surface, one end of the other longitudinal segment is connected to the fourth surface, and the two ends of the transverse segment are respectively connected to the other ends of the two longitudinal segments.

6. The multi-frequency antenna as described in claim 3, wherein, It includes a carrier plate spaced between the second surface and the fourth surface, a first grounding member connected between the carrier plate and the second surface, and a second grounding member connected between the carrier plate and the fourth surface.

7. The multi-frequency antenna as described in claim 6, wherein, The first radiator and the second radiator are respectively supported on the carrier plate by the first grounding member and the second grounding member.

8. The multi-frequency antenna as described in claim 3, wherein, A groove is formed between the first arm and the second arm of the second radiator. The first radiator has two sides, which are spaced apart from and parallel to the first arm and the second arm, respectively.

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