Antenna System

Abstract

An antenna system. The antenna structure includes a near field communication antenna, a coupling metal part, and a second dielectric substrate; the near field communication antenna includes a metal coil and a first dielectric substrate, the metal coil is arranged on the first dielectric substrate; the coupling metal part is adjacent to the metal coil, wherein the coupling metal part is not in direct contact with the metal coil; the coupling metal part is arranged on the second dielectric substrate, wherein the coupling metal part is used to adjust the operating frequency of the near field communication antenna. Compared with the prior art, the antenna structure of the present invention has at least the advantages of small size, low manufacturing cost, and adjustable operating frequency, so it is very suitable for application in various mobile communication devices in different environments.

Description

Technical Field

[0001] The present invention relates to an antenna system, and in particular to an antenna system with adjustable operating frequency. Background Art

[0002] Near Field Communication (NFC), also known as short-range wireless communication, is a short-range high-frequency wireless communication technology that allows contactless point-to-point data transmission between electronic devices and exchanges data within ten centimeters (3.9 inches). However, due to different usage environments, the operating frequency of the NFC antenna may shift, resulting in a decrease in the overall communication quality. Therefore, a new solution must be proposed to overcome the problems faced by previous technologies. Summary of the invention

[0003] In a preferred embodiment, the present invention provides an antenna system, which includes: a near-field communication antenna, which includes a metal coil and a first dielectric substrate, wherein the metal coil is disposed on the first dielectric substrate; a coupling metal portion, which is adjacent to the metal coil, wherein the coupling metal portion is not in direct contact with the metal coil; and a second dielectric substrate, wherein the coupling metal portion is disposed on the second dielectric substrate; wherein the coupling metal portion is used to adjust an operating frequency of the near-field communication antenna.

[0004] In some embodiments, the coupling metal portion is in a floating state.

[0005] In some embodiments, the coupling metal portion has a vertical projection on the near field communication antenna, and the vertical projection at least partially overlaps with the metal coil.

[0006] In some embodiments, if the width of the coupling metal portion is reduced, the operating frequency of the near field communication antenna will be reduced.

[0007] In some embodiments, if the width of the coupling metal portion increases, the operating frequency of the near field communication antenna will increase.

[0008] In some embodiments, the coupling metal portion has a spiral shape.

[0009] In some embodiments, the coupling metal portion has a meandering shape.

[0010] In some embodiments, the length of the metal coil is less than or equal to 0.25 times the wavelength of the operating frequency of the near field communication antenna.

[0011] In some embodiments, a length of the coupling metal portion is less than or equal to 0.5 times the wavelength of the operating frequency of the near field communication antenna.

[0012] In some embodiments, the width of the metal coil is between 0.2 mm and 2 mm.

[0013] In some embodiments, the width of the coupling metal portion is between 0.1 mm and 4 mm.

[0014] In some embodiments, a distance between the metal coil and the coupling metal portion is between 0.01 mm and 1.6 mm.

[0015] In some embodiments, the antenna system further includes: a ferrite layer, the ferrite layer being adjacent to the first dielectric substrate.

[0016] In some embodiments, the antenna system further includes: an insulating layer, wherein the insulating layer is used to separate the metal coil from the coupling metal portion.

[0017] In some embodiments, the antenna system further includes: one or more inductors, wherein the inductor is coupled in series with the coupling metal portion.

[0018] In some embodiments, the antenna system further includes: one or more capacitors, wherein the capacitor is coupled in series with the coupling metal portion.

[0019] In some embodiments, the first dielectric substrate has a first surface and a second surface opposite to each other, and a thickness of the first dielectric substrate is between 0.1 mm and 0.8 mm.

[0020] In some embodiments, the antenna system further includes: one or more first conductive through-elements, the first conductive through-elements penetrating the first dielectric substrate, wherein the metal coil is distributed on the first surface and the second surface of the first dielectric substrate by using the first conductive through-elements.

[0021] In some embodiments, the second dielectric substrate has a third surface and a fourth surface opposite to each other, and a thickness of the second dielectric substrate is between 0.1 mm and 0.8 mm.

[0022] In some embodiments, the antenna system further includes: a second conductive through-element, the second conductive through-element penetrating the second dielectric substrate, wherein the coupling metal portion is distributed on the third surface and the fourth surface of the second dielectric substrate by using the second conductive through-element.

[0023] Compared with the prior art, the antenna structure of the present invention has at least the advantages of small size, low manufacturing cost, and adjustable operating frequency, so it is very suitable for application in various mobile communication devices in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A A top view of an antenna system according to an embodiment of the present invention is shown.

[0025] Figure 1B A side view of an antenna system according to an embodiment of the present invention is shown.

[0026] Figure 2 A diagram showing the operating characteristics of an antenna system according to an embodiment of the present invention

[0027] Figure 3A A side view of an antenna system according to an embodiment of the present invention is shown.

[0028] Figure 3B A side view of an antenna system according to an embodiment of the present invention is shown.

[0029] Figure 3C A side view of an antenna system according to an embodiment of the present invention is shown.

[0030] Figure 3D A side view of an antenna system according to an embodiment of the present invention is shown.

[0031] Figure 4A A top view of an antenna system according to an embodiment of the present invention is shown.

[0032] Figure 4B A top view of an antenna system according to an embodiment of the present invention is shown.

[0033] Figure 4C A top view of an antenna system according to an embodiment of the present invention is shown.

[0034] Figure 5A A top view of an antenna system according to an embodiment of the present invention is shown.

[0035] Figure 5B A top view of an antenna system according to an embodiment of the present invention is shown.

[0036] Figure 5C A top view of an antenna system according to an embodiment of the present invention is shown.

[0037] Figure 6 A top view of an antenna system according to an embodiment of the present invention is shown.

[0038] Fig. 7AA top view of an antenna system according to an embodiment of the present invention is shown.

[0039] Figure 7B A perspective view showing an antenna system according to an embodiment of the present invention.

[0040] Figure 7C A side view of an antenna system according to an embodiment of the present invention is shown.

[0041] Main component symbols:

[0042] 110 Near Field Communication Antenna

[0043] 120 Metal Coil

[0044] 121 First end of the metal coil

[0045] 122 The second end of the metal coil

[0046] 130 first dielectric substrate

[0047] 140, 440, 540, 640, 740 Coupling metal part

[0048] 141, 641, 741 first end of the coupling metal part

[0049] 142, 642, 742 Second end of the coupling metal portion

[0050] 150 second dielectric substrate

[0051] 160 Ferrite layer

[0052] 170 Insulation layer

[0053] 191, 192 first conductive through element

[0054] 193 Second conductive through element

[0055] 745 The first part of the coupling metal part

[0056] 746 The second part of the coupling metal part

[0057] C1, C2, C3 capacitors

[0058] D1 Spacing

[0059] E1 First Surface

[0060] E2 Second Surface

[0061] E3 Third Surface

[0062] E4 Fourth Surface

[0063] FC Center frequency

[0064] FH High frequency offset frequency

[0065] FL Low frequency offset frequency

[0066] FP1 First feeding point

[0067] FP2 Second feeding point

[0068] G1, G2 internal clearance

[0069] H1, H2 thickness

[0070] L1, L2, L3 Inductors

[0071] W1, W2 Width

[0072] 100, 301, 302, 303, 304, 401, 402, 403, 501, 502, 503, 600, 700 antenna systems DETAILED DESCRIPTION

[0073] In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are given below and described in detail with reference to the accompanying drawings.

[0074] Certain words are used in the scope of the specification and claims to refer to specific components. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and claims does not use differences in names as a way to distinguish components, but uses differences in the functions of components as the criteria for distinction. The words "including" and "comprising" mentioned in the scope of the entire specification and claims are open-ended terms and should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0075] The following disclosure provides many different embodiments or examples to implement the different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if this specification describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the same reference symbols and / or marks may be reused in different examples in the following specification. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the specific relationship between the different embodiments and / or structures discussed.

[0076] In addition, spatially relative terms such as "below," "below," "lower," "above," "upper," and similar terms used in the specification and claims are intended to facilitate description of the relationship between one element or feature and another element or features in the drawings. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the spatially relative terms used herein may be interpreted accordingly.

[0077] Figure 1A A top view of an antenna system 100 according to an embodiment of the present invention is shown. Figure 1B A side view of an antenna system 100 according to an embodiment of the present invention is shown. Figure 1A , Figure 1B The antenna system 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. Figure 1A , Figure 1B As shown, the antenna system 100 at least includes: a near field communication antenna (NFC Antenna) 110, which includes a metal coil (Metal Coil) 120 and a first dielectric substrate (Dielectric Substrate) 130, a coupling metal element (Coupling Metal Element) 140, and a second dielectric substrate 150. It should be understood that although not shown in Figure 1A , Figure 1BHowever, the antenna system 100 may further include other components, such as: a system ground plane, a radio frequency (RF) module, and a housing.

[0078] The metal coil 120 is disposed on the first dielectric substrate 130. The shape and number of turns of the metal coil 120 are not particularly limited in the present invention. In detail, the metal coil 120 has a first end 121 and a second end 122, wherein a first feeding point FP1 is located at the first end 121 of the metal coil 120, and a second feeding point FP2 is located at the second end 122 of the metal coil 120. The first feeding point FP1 and the second feeding point FP2 can also be respectively coupled to the positive and negative poles (not shown) of a signal source via a matching circuit, so that the near field communication antenna 110 can be excited by the aforementioned signal source.

[0079] The first dielectric substrate 130 may be a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit board (FPC). The first dielectric substrate 130 has a first surface E1 and a second surface E2 opposite to each other. In some embodiments, the antenna system 100 further includes one or more first conductive via elements 191, 192, which can penetrate the first dielectric substrate 130, and the metal coil 120 can be distributed on the first surface E1 and the second surface E2 of the first dielectric substrate 130 by using the aforementioned first conductive via elements 191, 192 (a dotted line segment between the first conductive via elements 191, 192 represents that the two are coupled to each other). However, the present invention is not limited thereto. In other embodiments, the metal coil 120 can also be distributed only on the first surface E1 or the second surface E2 of the first dielectric substrate 130.

[0080] The coupling metal part 140 is disposed on the second dielectric substrate 150. For example, the coupling metal part 140 may be substantially in the shape of a spiral. The shape and number of turns of the coupling metal part 140 are not particularly limited in the present invention. In detail, the coupling metal part 140 has a first end 141 and a second end 142, which are two open ends. In other words, the coupling metal part 140 may be in a floating state. The coupling metal part 140 is adjacent to the metal coil 120, wherein the coupling metal part 140 is not in direct contact with the metal coil 120. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a spacing between two corresponding elements that is less than a predetermined distance (for example, 5 mm or less), but generally does not include a situation where the two corresponding elements are in direct contact with each other (that is, the aforementioned spacing is shortened to 0). In some embodiments, the coupling metal part 140 has a vertical projection on the near field communication antenna 110, wherein the vertical projection at least partially overlaps with the metal coil 120.

[0081] The second dielectric substrate 150 may be a FR4 substrate, a printed circuit board, or a flexible circuit board, and may be independent of the first dielectric substrate 130. The second dielectric substrate 150 has a third surface E3 and a fourth surface E4 opposite to each other, wherein the coupling metal portion 140 may be distributed only on the third surface E3 of the second dielectric substrate 150. However, the present invention is not limited thereto. In other embodiments, the coupling metal portion 140 may also be distributed only on the fourth surface E4 of the second dielectric substrate 150.

[0082] Figure 2 The operating characteristic diagram of the antenna system 100 according to an embodiment of the present invention is shown, wherein the horizontal axis represents frequency and the vertical axis represents radiation efficiency. In an ideal state, an operating frequency of the near field communication antenna 110 is located at a center frequency FC. However, in response to different usage environments, the operating frequency of the near field communication antenna 110 may drop to a low frequency offset frequency FL, or rise to a high frequency offset frequency FH. At this time, the coupling metal portion 140 may resonate with the metal coil 120 and be used to readjust the operating frequency of the near field communication antenna 110. For example, if the width W2 of the coupling metal portion 140 is reduced (it may be less than or equal to the width W1 of the metal coil 120), the operating frequency of the near field communication antenna 110 may be reduced from the high frequency offset frequency FH ​​back to the center frequency FC; conversely, if the width W2 of the coupling metal portion 140 is increased (it may be greater than or equal to the width W1 of the metal coil 120), the operating frequency of the near field communication antenna 110 may be increased from the low frequency offset frequency FL back to the center frequency FC. According to Figure 2According to the measurement results, by appropriately changing the width W2 of the coupling metal portion 140, the operating frequency of the near field communication antenna 110 can achieve an optimized result. In other embodiments, the aforementioned adjustment of the operating frequency can be further achieved by appropriately changing the number of turns and / or the internal gap G2 of the coupling metal portion 140.

[0083] In some embodiments, the element dimensions of the antenna system 100 may be as described below. The length of the metal coil 120 (i.e., the length from the first end 121, through the first conductive through elements 191, 192, to the second end 122) may be less than or equal to 0.25 times the wavelength (λ / 4) of the operating frequency of the near field communication antenna 110. The width (or line width, LineWidth) W1 of the metal coil 120 may be approximately between 0.2 mm and 2 mm. The width of the internal gap G1 of the metal coil 120 (i.e., the distance between any two adjacent parallel metal lines of the metal coil 120) may be approximately between 0.2 mm and 2 mm. The thickness H1 of the first dielectric substrate 130 (i.e., the distance between the first surface E1 and the second surface E2) may be between 0.1 mm and 0.8 mm. The length of the coupling metal portion 140 (i.e., the length from the first end 141 to the second end 142) may be less than or equal to 0.5 times the wavelength (λ / 2) of the operating frequency of the near field communication antenna 110. The width (or line width) W2 of the coupling metal portion 140 may be approximately between 0.1 mm and 4 mm. The width of the internal gap G2 of the coupling metal portion 140 (i.e., the distance between any two adjacent parallel metal lines of the coupling metal portion 140) may be approximately between 0.1 mm and 4 mm. The thickness H2 of the second dielectric substrate 150 (i.e., the distance between the third surface E3 and the fourth surface E4) may be between 0.1 mm and 0.8 mm. The distance D1 between the metal coil 120 and the coupling metal portion 140 (i.e., the shortest distance between the two) may be approximately between 0.01 mm and 1.6 mm. The above ranges of component sizes are obtained based on multiple experimental results, which are helpful in optimizing the operational bandwidth and impedance matching of the antenna system 100 .

[0084] Figure 3A A side view of an antenna system 301 according to an embodiment of the present invention is shown. Figure 3A and Figure 1B Similar. Figure 3AIn the embodiment of the present invention, the antenna system 301 further includes a ferrite sheet 160, which is adjacent to the first dielectric substrate 130. For example, the ferrite sheet 160 can be directly attached to the second surface E2 of the first dielectric substrate 130, but is not limited thereto. The ferrite sheet 160 can be used to suppress electromagnetic interference (EMI) from other metal or circuit elements. Figure 3A The remaining features of the antenna system 301 are the same as Figure 1A , Figure 1B The antenna system 100 is similar, so both embodiments can achieve similar operating effects.

[0085] Figure 3B A side view of an antenna system 302 is shown in accordance with an embodiment of the present invention. Figure 3B and Figure 3A Similar. Figure 3B In the embodiment of the present invention, the coupling metal portion 140 may be distributed only on the fourth surface E4 of the second dielectric substrate 150. It should be noted that the fourth surface E4 of the second dielectric substrate 150 and the first surface E1 of the first dielectric substrate 130 are facing each other. In order to prevent the coupling metal portion 140 from directly contacting the metal coil 120, the antenna system 302 further includes an isolation layer 170, which can be used to completely separate the metal coil 120 from the coupling metal portion 140. For example, the isolation layer 170 can be implemented with a very thin (e.g., less than or equal to 0.1 mm) solder mask ink layer, but is not limited thereto. Figure 3B The remaining features of the antenna system 302 are the same as Figure 3A The antenna system 301 is similar, so both embodiments can achieve similar operating effects.

[0086] Figure 3C A side view of an antenna system 303 is shown according to an embodiment of the present invention. Figure 3C and Figure 3A Similar. Figure 3C In the embodiment of FIG. 1 , the metal coil 120 may be mainly distributed on the second surface E2 of the first dielectric substrate 130. Figure 3A The metal coils 120 may be mainly distributed on the first surface E1 of the first dielectric substrate 130 . Figure 3C The remaining features of the antenna system 303 are the same as Figure 3A The antenna system 301 is similar, so both embodiments can achieve similar operating effects.

[0087] Figure 3D A side view of an antenna system 304 is shown in accordance with an embodiment of the present invention. Figure 3D and Figure 3C Similar. Figure 3D In the embodiment of FIG. 3 , the coupling metal portion 140 may be distributed only on the fourth surface E4 of the second dielectric substrate 150 , and the antenna system 304 further includes an insulating layer 170 , which may be used to completely separate the metal coil 120 from the coupling metal portion 140 . Figure 3D The remaining features of the antenna system 304 are the same as Figure 3C The antenna system 303 is similar, so both embodiments can achieve similar operating effects.

[0088] Figure 4A A top view of an antenna system 401 according to an embodiment of the present invention is shown. Figure 4B A top view of an antenna system 402 according to an embodiment of the present invention is shown. Figure 4C FIG. 4 is a top view of an antenna system 403 according to an embodiment of the present invention. To simplify the drawing, the corresponding near field communication antennas are omitted. Figure 4A , Figure 4B , Figure 4C In the embodiment of the present invention, the antenna systems 401, 402, 403 may each include one or more inductors L1, L2, L3, which may be coupled in series with a coupling metal portion 440. The number and arrangement of the inductors L1, L2, L3 may be freely adjusted. According to actual measurement results, since the inductance characteristics of the coupling metal portion 440 are enhanced, the operating frequency of the corresponding near field communication antenna will be significantly increased. Figure 4A , Figure 4B , Figure 4C The remaining features of the antenna systems 401, 402, 403 are the same as Figure 1A , Figure 1B The antenna system 100 is similar to that of the present invention, so these embodiments can achieve similar operating effects.

[0089] Figure 5A A top view of an antenna system 501 according to an embodiment of the present invention is shown. Figure 5B A top view of an antenna system 502 according to an embodiment of the present invention is shown. Figure 5C FIG. 5 is a top view of an antenna system 503 according to an embodiment of the present invention. To simplify the drawing, the corresponding near field communication antennas are omitted. Figure 5A , Figure 5B , Figure 5CIn the embodiment of the present invention, the antenna systems 501, 502, 503 may each include one or more capacitors C1, C2, C3, which may be coupled in series with a coupling metal portion 540. The number and arrangement of the capacitors C1, C2, C3 may be freely adjusted. According to actual measurement results, since the inductance characteristic of the coupling metal portion 540 is weakened, the operating frequency of the corresponding near field communication antenna will be significantly reduced. Figure 5A , Figure 5B , Figure 5C The remaining features of the antenna systems 501, 502, and 503 are the same as Figure 1A , Figure 1B The antenna system 100 is similar to that of the present invention, so these embodiments can achieve similar operating effects.

[0090] Figure 6 FIG. 6 is a top view of an antenna system 600 according to an embodiment of the present invention. In order to simplify the drawing, the corresponding near field communication antenna is omitted. Figure 6 In the embodiment of the present invention, a coupling metal portion 640 of the antenna system 600 presents a meandering shape, which may include a plurality of U-shapes connected to each other. Specifically, the coupling metal portion 640 has a first end 641 and a second end 642, which are two open ends. According to actual measurement results, even if the coupling metal portion 640 has a different shape (e.g., non-spiral shape), it can also be used to fine-tune the operating frequency of the corresponding near field communication antenna. Figure 6 The remaining features of the antenna system 600 are the same as Figure 1A , Figure 1B The antenna system 100 is similar, so both embodiments can achieve similar operating effects.

[0091] Fig. 7A A top view of an antenna system 700 according to an embodiment of the present invention is shown. Figure 7B A perspective view of an antenna system 700 is shown in accordance with an embodiment of the present invention. Figure 7C A side view of an antenna system 700 according to an embodiment of the present invention is shown. Fig. 7A , Figure 7B , Figure 7C In order to simplify the drawing, the corresponding near field communication antenna is omitted. Fig. 7A , Figure 7B , Figure 7CIn the embodiment of the present invention, a coupling metal portion 740 of the antenna system 700 includes a first portion 745 and a second portion 746, wherein the first portion 745 is disposed on the third surface E3 of the second dielectric substrate 150, and the second portion 746 is disposed on the fourth surface E4 of the second dielectric substrate 150. In detail, the coupling metal portion 740 has a first end 741 and a second end 742, wherein the first end 741 of the coupling metal portion 740 is adjacent to the first portion 745, and the second end 742 of the coupling metal portion 740 is adjacent to the second portion 746. For example, the first portion 745 of the coupling metal portion 740 may be substantially in a spiral shape, and the second portion 746 of the coupling metal portion 740 may be substantially in a meandering shape, but the present invention is not limited thereto. In other embodiments, the first portion 745 and the second portion 746 of the coupling metal portion 740 may both be in a spiral shape or a meandering shape. It should be noted that the antenna system 700 further includes a second conductive through-element 193, which can penetrate the second dielectric substrate 150 and can be coupled between the first portion 745 and the second portion 746 of the coupling metal portion 740. The coupling metal portion 740 can be distributed on the third surface E3 and the fourth surface E4 of the second dielectric substrate 150 by using the second conductive through-element 193. According to actual measurement results, such a double-sided coupling metal portion 740 can further adjust the operating frequency of the corresponding near field communication antenna. Fig. 7A , Figure 7B , Figure 7C The remaining features of the antenna system 700 are the same as Figure 1A , Figure 1B The antenna system 100 is similar, so both embodiments can achieve similar operating effects.

[0092] The present invention provides a novel antenna system. Compared with the prior art, the antenna structure of the present invention has at least the advantages of small size, low manufacturing cost, and adjustable operating frequency, so it is very suitable for application in various mobile communication devices in different environments.

[0093] It is worth noting that the above-mentioned component size, component shape, and frequency range are not limiting conditions of the present invention. Antenna designers can adjust these settings according to different needs. The antenna system of the present invention is not limited to Figure 1A -7. The present invention may only include Figure 1A -7. In other words, not all features of the drawings need to be implemented in the antenna system of the present invention at the same time.

[0094] In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to distinguish two different components with the same name.

[0095] Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art should be able to make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the attached claims.

Claims

1. An antenna system, comprising: A near field communication antenna, comprising a metal coil and a first dielectric substrate, wherein the metal coil is disposed on the first dielectric substrate; a coupling metal portion, the coupling metal portion being adjacent to the metal coil, wherein the coupling metal portion is not in direct contact with the metal coil; as well as a second dielectric substrate, wherein the coupling metal portion is disposed on the second dielectric substrate; The coupling metal portion is used to adjust an operating frequency of the near field communication antenna; The length of the coupling metal portion is less than or equal to 0.5 times the wavelength of the operating frequency of the near field communication antenna. 2 . The antenna system as claimed in claim 1 , wherein the coupling metal portion is in a floating state. 3 . The antenna system as claimed in claim 1 , wherein the coupling metal portion has a vertical projection on the near field communication antenna, and the vertical projection at least partially overlaps with the metal coil. 4 . The antenna system as claimed in claim 1 , wherein if the width of the coupling metal portion is reduced, the operating frequency of the near field communication antenna will be reduced. 5 . The antenna system as claimed in claim 1 , wherein if the width of the coupling metal portion increases, the operating frequency of the near field communication antenna will increase. The antenna system as claimed in claim 1 , wherein the coupling metal portion has a spiral shape. The antenna system as claimed in claim 1 , wherein the coupling metal portion has a meandering shape. 8 . The antenna system as claimed in claim 1 , wherein a length of the metal coil is less than or equal to 0.25 times the wavelength of the operating frequency of the near field communication antenna. 9 . The antenna system as claimed in claim 1 , wherein a width of the metal coil is between 0.2 mm and 2 mm. 10 . The antenna system as claimed in claim 1 , wherein a width of the coupling metal portion is between 0.1 mm and 4 mm. 11 . The antenna system as claimed in claim 1 , wherein a distance between the metal coil and the coupling metal portion is between 0.01 mm and 1.6 mm.

12. The antenna system of claim 1, further comprising: A ferrite layer is adjacent to the first dielectric substrate.

13. The antenna system of claim 1, further comprising: An insulating layer is used to separate the metal coil from the coupling metal part.

14. The antenna system of claim 1, further comprising: One or more inductors are coupled in series with the coupling metal portion.

15. The antenna system of claim 1, further comprising: One or more capacitors are coupled in series with the coupling metal portion. 16 . The antenna system as claimed in claim 1 , wherein the first dielectric substrate has a first surface and a second surface opposite to each other, and a thickness of the first dielectric substrate is between 0.1 mm and 0.8 mm.

17. The antenna system of claim 16, further comprising: One or more first conductive through-element, the first conductive through-element penetrates the first dielectric substrate, wherein the metal coil is distributed on the first surface and the second surface of the first dielectric substrate by using the first conductive through-element. 18 . The antenna system as claimed in claim 1 , wherein the second dielectric substrate has a third surface and a fourth surface opposite to each other, and a thickness of the second dielectric substrate is between 0.1 mm and 0.8 mm.

19. The antenna system of claim 18, further comprising: A second conductive through-element is provided, the second conductive through-element penetrates the second dielectric substrate, wherein the coupling metal portion is distributed on the third surface and the fourth surface of the second dielectric substrate by using the second conductive through-element.

Images