A multi-frequency co-body antenna

Abstract

The present invention provides a multi-frequency co-body antenna, comprising an antenna substrate with a V-shaped extension and an L-shaped extension on the left and right sides, respectively; the vertical branches of the L-shaped extension are provided with an ultra-low frequency radiation branch; the lower branches of the V-shaped extension are provided with a high frequency radiation branch, the upper branches of the V-shaped extension are provided with a low frequency radiation branch, and the horizontal branches of the L-shaped extension are provided with a first resonant branch, an intermediate frequency radiation branch, and a second resonant branch at intervals; the high frequency radiation branch and the intermediate frequency radiation branch are connected and connected to a first feeding point and a grounding point, the two ends of the first resonant branch are respectively connected to the right end of the low frequency radiation branch and the right end of the intermediate frequency radiation branch; the two ends of the second resonant branch are respectively connected to the first feeding point on the antenna substrate and the ultra-low frequency radiation branch. The multi-frequency co-body antenna of the present invention achieves full coverage of high frequency, intermediate frequency, low frequency, and ultra-low frequency radiation frequencies.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-frequency antennas, and in particular to a multi-frequency co-body antenna. Background Art

[0002] See also Figure 1 Conventional multi-band coexisting antennas, primarily composed of a main antenna A and a parasitic antenna B, can meet the performance requirements of the 700-960MHz and 1710-2690MHz frequency bands. However, they cannot meet the requirements of the NFC near-field communication frequency (13.56MHz). Therefore, existing technologies still need to develop a communication antenna that can meet the requirements of a wider frequency band to achieve more comprehensive support for 2G / 3G / 4G / NFC communications.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] The present invention provides a multi-frequency co-body antenna, aiming to solve the technical problems mentioned in the background art of the prior art multi-frequency co-body antenna.

[0005] The technical solutions of the present invention are as follows:

[0006] A multi-frequency co-body antenna includes an antenna substrate, wherein a V-shaped extension with an opening facing left is provided on the left side of the antenna substrate, and a downward-bending L-shaped extension is provided on the right side of the antenna substrate; a first feeding point and a grounding point are provided on the antenna substrate at intervals, and a vertical branch of the L-shaped extension is provided with an ultra-low frequency radiation branch and a second feeding point connected to the ultra-low frequency radiation branch; a high-frequency radiation branch is provided on the lower branch of the V-shaped extension, and a low-frequency radiation branch is provided on the upper branch of the V-shaped extension; and a first resonant branch, an intermediate frequency radiation branch, and a second resonant branch are provided on the horizontal branches of the L-shaped extension from top to bottom.

[0007] The right end of the high-frequency radiation branch is connected to the left end of the intermediate-frequency radiation branch, the first feeding point is connected to the right end of the high-frequency radiation branch, and the grounding point is connected to the left end of the intermediate-frequency radiation branch; the left and right ends of the first resonant branch are respectively connected to the right end of the low-frequency radiation branch and the right end of the intermediate-frequency radiation branch; the left and right ends of the second resonant branch are respectively connected to the first feeding point and the ultra-low-frequency radiation branch.

[0008] In an optional embodiment of the first aspect of the present invention, the multi-frequency community antenna further includes a first NFC community line; two ends of the first NFC community line are respectively connected to the first end of the NFC antenna and the second feeding point, a first inductor is provided on the first NFC community line, and a first capacitor is connected to a branch on the first NFC community line between the first inductor and the first end of the NFC antenna, and the other end of the first capacitor is grounded.

[0009] In an optional embodiment of the first aspect of the present invention, the multi-frequency community antenna further includes a second NFC community circuit; two ends of the second NFC community circuit are respectively connected to the second end of the NFC antenna and the first feeding point, a second inductor is provided on the second NFC community circuit, and a second capacitor is connected to a branch on the second NFC community circuit between the second inductor and the second end of the NFC antenna, and the other end of the second capacitor is grounded; a debugging circuit is provided on the second NFC community circuit between the first feeding point and the second inductor.

[0010] In an optional embodiment of the first aspect of the present invention, the lower branch of the V-shaped extension is bent in a direction away from the upper branch of the V-shaped extension, and the high-frequency radiation branch is also bent following the lower branch of the V-shaped extension.

[0011] In an optional embodiment of the first aspect of the present invention, a first inner concave portion is provided on the transverse branch at the inner corner of the L-shaped extension portion, and the inner concave width of the first inner concave portion is 2-3 mm.

[0012] In an optional embodiment of the first aspect of the present invention, the non-opening side end of the upper branch of the V-shaped extension is provided with a first step portion, and the non-opening side end of the low-frequency radiation branch follows the upper branch of the V-shaped extension to form a step shape.

[0013] In an optional implementation manner of the first aspect of the present invention, a second concave portion is provided on the upper edge of the antenna substrate corresponding to the first feeding point, and the concave width of the second concave portion is 1-2 mm.

[0014] In an optional embodiment of the first aspect of the present invention, a second step portion is provided on the lateral branch at the outer corner of the L-shaped extension portion, and the intermediate frequency radiation branch at the position of the second step portion follows the lateral branch of the L-shaped extension portion to form a stepped shape.

[0015] In an optional implementation of the first aspect of the present invention, the distance between the first resonant branch and the intermediate frequency radiation branch is 0.3-0.4 mm; the distance between the second resonant branch and the intermediate frequency radiation branch is 0.3-0.4 mm.

[0016] In an optional embodiment of the first aspect of the present invention, the radiation frequency of the high-frequency radiation branch is 2300-2700 MHz, the radiation frequency of the medium-frequency radiation branch is 1700-2200 MHz, the radiation frequency of the low-frequency radiation branch is 700-1000 MHz, and the radiation frequency of the ultra-low-frequency radiation branch is 12-15 MHz.

[0017] The beneficial effects are as follows: the present invention provides a multi-frequency co-body antenna, comprising an antenna substrate with a V-shaped extension and an L-shaped extension on the left and right sides respectively, the vertical branches of the L-shaped extension being provided with an ultra-low frequency radiation branch; the lower branches of the V-shaped extension being provided with a high frequency radiation branch, the upper branches of the V-shaped extension being provided with a low frequency radiation branch, and the horizontal branches of the L-shaped extension being provided with a first resonant branch, an intermediate frequency radiation branch, and a second resonant branch at intervals; the high frequency radiation branch and the intermediate frequency radiation branch being connected and connected to a first feeding point and a grounding point, the two ends of the first resonant branch being respectively connected to the right end of the low frequency radiation branch and the right end of the intermediate frequency radiation branch; the two ends of the second resonant branch being respectively connected to the first feeding point and the ultra-low frequency radiation branch on the antenna substrate. The multi-frequency co-body antenna of the present invention achieves full coverage of high frequency, intermediate frequency, low frequency, and ultra-low frequency radiation frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic structural diagram of an existing multi-frequency co-body antenna of the present invention.

[0019] Figure 2 This is a structural schematic diagram of a multi-frequency co-body antenna of the present invention.

[0020] Figure 3 This is a structural diagram of a first NFC community circuit of the present invention.

[0021] Figure 4 This is a structural diagram of a second NFC community circuit of the present invention.

[0022] The reference numerals in the figures are as follows:

[0023] 10-antenna substrate; 20-V-shaped extension; 30-L-shaped extension; 40-first feeding point; 50-grounding point; 60-ultra-low frequency radiation branch; 70-second feeding point; 80-high frequency radiation branch; 90-low frequency radiation branch; 100-first resonant branch; 110-intermediate frequency radiation branch; 120-second resonant branch; 130-first NFC common circuit; 140-first inductor; 150-first capacitor; 160-second NFC common circuit; 170-second inductor; 180-second capacitor; 190-debugging circuit; 200-first recessed portion; 210-first stepped portion; 220-second recessed portion; 230-second stepped portion. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0027] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, when the phrases "in one embodiment" or "in some embodiments" appear in various places throughout this specification, not all references are to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] See also Figure 2The present invention provides a multi-frequency co-body antenna, including an antenna substrate 10, which can be exemplarily an FR4 substrate. A V-shaped extension portion 20 with an opening facing left is provided on the left side of the antenna substrate 10, and an L-shaped extension portion 30 with a downward bend is provided on the right side of the antenna substrate 10. In the present invention, the opening facing left means that the V-shaped extension portion 20 is connected to the left side of the antenna substrate 10 through a tip portion, and the downward bend means that the L-shaped extension portion 30 is first horizontally (i.e., Figure 2 to the right) and then vertically (i.e. Figure 2 downward) to form an L-shape.

[0029] In the present invention, a first feeding point 40 and a grounding point 50 are arranged at intervals on the antenna substrate 10. The first feeding point 40 is used for antenna feeding and is compatible with NFC excitation. The vertical branch of the L-shaped extension 30 is provided with an ultra-low frequency radiation branch 60 (the radiation frequency of the ultra-low frequency radiation branch 60 can be 12-15 MHz) and a second feeding point 70 connected to the ultra-low frequency radiation branch 60. The second feeding point 70 is used for antenna grounding and is also compatible with NFC excitation; a high-frequency radiation branch 80 is provided on the lower branch of the V-shaped extension 20 (the radiation frequency of the high-frequency radiation branch 80 can be 230 0-2700MHz), the upper branch of the V-shaped extension portion 20 is provided with a low-frequency radiation branch 90 (the radiation frequency of the low-frequency radiation branch 90 can be 700-1000MHz), and the lateral branches of the L-shaped extension portion 30 are provided with a first resonant branch 100, an intermediate frequency radiation branch 110 (the radiation frequency of the intermediate frequency radiation branch 110 can be 1700-2200MHz) and a second resonant branch 120 from top to bottom, and the first resonant branch 100, the intermediate frequency radiation branch 110 and the second resonant branch 120 are all arranged horizontally on the lateral branches of the L-shaped extension portion 30.

[0030] In the present invention, the right end of the high-frequency radiation branch 80 is connected to the left end of the intermediate-frequency radiation branch 110, the first feeding point 40 is connected to the right end of the high-frequency radiation branch 80, and the grounding point 50 is connected to the left end of the intermediate-frequency radiation branch 110. More specifically, the first feeding point 40 and the grounding point 50 are respectively connected to the left and right sides of the intersection of the right end of the high-frequency radiation branch 80 and the intermediate-frequency radiation branch 110, and the first feeding point 40 and the grounding point 50 are spaced apart on the left and right sides. The left and right ends of the first resonant branch 100 are respectively connected to the right end of the low-frequency radiation branch 90 and the right end of the intermediate-frequency radiation branch 110. The left and right ends of the second resonant branch 120 are respectively connected to the first feeding point 40 and the ultra-low-frequency radiation branch 60. The multi-frequency co-body antenna of the present invention has a compact structure and achieves full coverage of high-frequency, intermediate-frequency, low-frequency, and ultra-low-frequency radiation frequencies.

[0031] See also Figure 2 In an optional embodiment of the present invention, the distance from the leftmost end of the multi-frequency co-body antenna (i.e., the leftmost end of the low-frequency radiation branch 90) to the rightmost end (the rightmost end of the ultra-low-frequency radiation branch 60) is 40-60 mm (exemplary, for example, 40.00 mm, 48.12 mm, 50.00 mm and 60.00 mm), and the distance from the top end of the multi-frequency co-body antenna (the top edge of the first resonant branch 100) to the bottom end (the bottom edge of the second resonant branch 120) is 40-60 mm (exemplary, for example, 40.00 mm, 48.12 mm, 50.00 mm and 60.00 mm). ) is 9-11mm (for example, 9.00mm, 9.54mm, 10.00mm and 11mm), the spacing a between the first resonant branch 100 and the intermediate frequency radiation branch 110 is 0.3-0.4mm (for example, 0.3mm, 0.35mm and 0.4mm); the spacing b between the second resonant branch 120 and the intermediate frequency radiation branch 110 is 0.3-0.4mm (for example, 0.3mm, 0.35mm and 0.4mm). In the present invention, the distance a between the first resonant branch 100 and the intermediate frequency radiation branch 110 can adjust the bandwidth between the intermediate frequency radiation branch 110 and the high frequency radiation branch 80, and the distance b between the second resonant branch 120 and the intermediate frequency radiation branch 110 can adjust the resonance between the ultra-low frequency radiation branch 60 and the intermediate frequency radiation branch 110. The ultra-low frequency radiation branch 60 is set in this way, which has little impact on the intermediate frequency radiation branch 110, and can also solve the problem of low efficiency when the antenna is switched to ultra-low frequency.

[0032] See also Figure 3 In an optional embodiment of the first aspect of the present invention, the multi-frequency co-body antenna further includes a first NFC co-body circuit 130; the two ends of the first NFC co-body circuit 130 are respectively connected to the first end of the NFC antenna and the second feeding point 70. A first inductor 140 (18-47 nH) is provided on the first NFC co-body circuit 130. A first capacitor 150 (90-110 pF) is connected to a branch of the first NFC co-body circuit 130 between the first inductor 140 and the first end of the NFC antenna. The other end of the first capacitor 150 is grounded. In the present invention, the second feeding point 70 is compatible with NFC excitation. The main function of providing the first inductor 140 and the first capacitor 150 in the first NFC co-body circuit 130 of the second feeding point 70 is to provide isolation. Based on the above parameter values, the first NFC co-body circuit 130 has little impact on the antenna's 4G frequency band.

[0033] See also Figure 4In an optional embodiment of the first aspect of the present invention, the multi-frequency antenna further includes a second NFC antenna circuit 160; the two ends of the second NFC antenna circuit 160 are connected to the second end of the NFC antenna and the first feed point 40, respectively. A second inductor 170 is provided on the second NFC antenna circuit 160. A second capacitor 180 is connected to a branch of the second NFC antenna circuit 160 between the second inductor 170 and the second end of the NFC antenna, and the other end of the second capacitor 180 is grounded. A debugging circuit 190 is provided on the second NFC antenna circuit 160 between the first feed point 40 and the second inductor 170. Similarly, the second NFC antenna circuit 160 can also function as the first NFC antenna circuit 130 described above. In the present invention, the debugging circuit 190 primarily adjusts the frequency of the multi-frequency antenna. In embodiments of the present invention combining the second NFC antenna circuit 160 with the first NFC antenna circuit 130, the multi-frequency antenna can function as both a diversity antenna and a second NFC antenna, enabling 360-degree scanning of NFC.

[0034] See also Figure 2 In an optional embodiment of the first aspect of the present invention, the lower branch of the V-shaped extension 20 is bent away from the upper branch of the V-shaped extension 20, and the high-frequency radiation branch 80 is also bent following the lower branch of the V-shaped extension 20. In this embodiment, the high-frequency radiation branch 80 is also bent following the lower branch of the V-shaped extension 20, which can reduce mutual interference between the high-frequency radiation branch 80 and the low-frequency radiation branch 90.

[0035] See also Figure 2 In an optional embodiment of the first aspect of the present invention, a first recessed portion 200 is provided on the transverse branch at the inner corner of the L-shaped extension 30. The recessed width c of the first recessed portion 200 is 2-3 mm. In this embodiment, the first recessed portion 200 can optimize the resonance between the second resonant branch 120 and the intermediate frequency radiation branch 110, thereby optimizing the radiation waveform of the ultra-low frequency radiation branch 60.

[0036] See also Figure 2 In an optional embodiment of the first aspect of the present invention, a first stepped portion 210 is provided at the non-opening end of the upper branch of the V-shaped extension 20. The non-opening end of the low-frequency radiating branch 90 follows the upper branch of the V-shaped extension 20 to form a stepped shape. In this embodiment, the first stepped portion 210 can optimize the radiation waveform of the low-frequency radiating branch 90.

[0037] See also Figure 2In an optional embodiment of the first aspect of the present invention, a second recessed portion 220 is provided on the upper edge of the antenna substrate 10 corresponding to the first feed point 40. The recessed width d of the second recessed portion 220 is 1-2 mm. In this embodiment, the second recessed portion 220 can optimize the resonance between the first resonant branch 100 and the intermediate-frequency radiation branch 110, thereby optimizing the radiation waveform of the low-frequency radiation branch 90.

[0038] In an optional embodiment of the first aspect of the present invention, a second stepped portion 230 is provided on the transverse branch at the outer corner of the L-shaped extension 30. The intermediate frequency radiation branch 110 at the position of the second stepped portion 230 follows the transverse branch of the L-shaped extension 30 to form a stepped shape. In this embodiment, the provision of the second stepped portion 230 can optimize the radiation waveform of the ultra-low frequency radiation branch 60.

[0039] In summary, the present invention provides a multi-frequency co-body antenna, comprising an antenna substrate with a V-shaped extension and an L-shaped extension on the left and right sides respectively, the vertical branches of the L-shaped extension being provided with an ultra-low frequency radiation branch; the lower branches of the V-shaped extension being provided with a high frequency radiation branch, the upper branches of the V-shaped extension being provided with a low frequency radiation branch, and the horizontal branches of the L-shaped extension being provided with a first resonant branch, an intermediate frequency radiation branch, and a second resonant branch at intervals; the high frequency radiation branch and the intermediate frequency radiation branch being connected and connected to a first feeding point and a grounding point, the two ends of the first resonant branch being respectively connected to the right end of the low frequency radiation branch and the right end of the intermediate frequency radiation branch; the two ends of the second resonant branch being respectively connected to the first feeding point and the ultra-low frequency radiation branch on the antenna substrate. The multi-frequency co-body antenna of the present invention achieves full coverage of high frequency, intermediate frequency, low frequency, and ultra-low frequency radiation frequencies.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A multi-frequency co-body antenna, characterized in that: The antenna comprises an antenna substrate, wherein a V-shaped extension with an opening facing left is provided on the left side of the antenna substrate, and an L-shaped extension with a downward bend is provided on the right side of the antenna substrate; a first feeding point and a grounding point are provided on the antenna substrate at intervals, and a vertical branch of the L-shaped extension is provided with an ultra-low frequency radiation branch and a second feeding point connected to the ultra-low frequency radiation branch; a high-frequency radiation branch is provided on the lower branch of the V-shaped extension, and a low-frequency radiation branch is provided on the upper branch of the V-shaped extension; and a first resonant branch, an intermediate frequency radiation branch, and a second resonant branch are provided on the horizontal branches of the L-shaped extension from top to bottom. The right end of the high-frequency radiation branch is connected to the left end of the intermediate-frequency radiation branch, the first feeding point is connected to the right end of the high-frequency radiation branch, and the grounding point is connected to the left end of the intermediate-frequency radiation branch; the left and right ends of the first resonant branch are respectively connected to the right end of the low-frequency radiation branch and the right end of the intermediate-frequency radiation branch; the left and right ends of the second resonant branch are respectively connected to the first feeding point and the ultra-low-frequency radiation branch.

2. The multi-frequency co-body antenna according to claim 1, characterized in that: The multi-frequency common body antenna further includes a first NFC common body circuit; two ends of the first NFC common body circuit are respectively connected to the first end of the NFC antenna and the second feeding point, a first inductor is provided on the first NFC common body circuit, and a first capacitor is connected to a branch on the first NFC common body circuit between the first inductor and the first end of the NFC antenna, and the other end of the first capacitor is grounded.

3. The multi-frequency co-body antenna according to claim 2, characterized in that: The multi-frequency community antenna also includes a second NFC community circuit; two ends of the second NFC community circuit are respectively connected to the second end of the NFC antenna and the first feeding point, a second inductor is provided on the second NFC community circuit, and a second capacitor is connected to a branch of the second NFC community circuit between the second inductor and the second end of the NFC antenna, and the other end of the second capacitor is grounded; a debugging circuit is provided on the second NFC community circuit between the first feeding point and the second inductor.

4. The multi-frequency co-body antenna according to claim 1, characterized in that: The lower branch of the V-shaped extension is bent in a direction away from the upper branch of the V-shaped extension, and the high-frequency radiation branch is also bent following the lower branch of the V-shaped extension.

5. The multi-frequency co-body antenna according to claim 1, characterized in that: A first inner concave portion is provided on the transverse branch at the inner corner of the L-shaped extension portion, and the inner concave width of the first inner concave portion is 2-3 mm.

6. The multi-frequency co-body antenna according to claim 1, characterized in that: The non-opening side end portion of the upper branch of the V-shaped extension portion is provided with a first step portion, and the non-opening side end portion of the low-frequency radiation branch follows the upper branch of the V-shaped extension portion to form a step shape.

7. The multi-frequency co-body antenna according to claim 1, characterized in that: A second concave portion is provided on the upper edge of the antenna substrate corresponding to the first feeding point, and the concave width of the second concave portion is 1-2 mm.

8. The multi-frequency co-body antenna according to claim 1, characterized in that: A second step portion is provided on the transverse branch at the outer corner of the L-shaped extension portion, and the intermediate frequency radiation branch at the position of the second step portion follows the transverse branch of the L-shaped extension portion to form a step shape.

9. The multi-frequency co-body antenna according to claim 1, characterized in that: The distance between the first resonant branch and the intermediate frequency radiation branch is 0.3-0.4 mm; the distance between the second resonant branch and the intermediate frequency radiation branch is 0.3-0.4 mm.

10. The multi-frequency co-body antenna according to any one of claims 1 to 9, characterized in that: The radiation frequency of the high-frequency radiation branch is 2300-2700 MHz, the radiation frequency of the medium-frequency radiation branch is 1700-2200 MHz, the radiation frequency of the low-frequency radiation branch is 700-1000 MHz, and the radiation frequency of the ultra-low-frequency radiation branch is 12-15 MHz.

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