Antenna system

Abstract

The utility model provides an antenna system. The antenna system comprises a multilayer circuit board, a first radiation part, a second radiation part, a first ground plane, a first feed-in part, a second feed-in part, a second ground plane and a plurality of conductive through components. The multilayer circuit board includes a first layer and a second layer. The first radiation part is provided with a first slotted hole. The second radiation part is provided with a second slotted hole, wherein the second radiation part is adjacent to the first radiation part. The first radiation part, the second radiation part and the first ground plane are arranged on the first layer. The first feed-in portion may extend across the first slot. The second feed-in portion may extend across the second slot. The first feed-in portion, the second feed-in portion, and the second ground plane are disposed on the second layer. The conductive through assembly can be used for coupling the second ground plane to the first ground plane.

Description

Technical Field

[0001] The utility model relates to an antenna system, in particular to an antenna system with a wideband. Background Art

[0002] With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as laptop computers, mobile phones, multimedia players and other hybrid portable electronic devices. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-distance wireless communication ranges, such as mobile phones using 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz frequency bands used for communication, while some cover short-distance wireless communication ranges, such as Wi-Fi, Bluetooth systems use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

[0003] Antennas are essential components in the field of wireless communications. If the operational bandwidth of an antenna used to receive or transmit signals is too narrow, it is easy to cause a decrease in the communication quality of the mobile device. Therefore, how to design a small-sized, wide-bandwidth antenna system is an important issue for designers. Utility Model Content

[0004] In a preferred embodiment, the utility model provides an antenna system, comprising: a multi-layer circuit board, comprising a first layer and a second layer; a first radiating portion, having a first slot; a second radiating portion, having a second slot, wherein the second radiating portion is adjacent to the first radiating portion; a first ground plane, wherein the first radiating portion, the second radiating portion, and the first ground plane are all arranged on the first layer of the multi-layer circuit board; a first feeding portion, having a first feeding point, wherein the first feeding portion extends across the first slot; a second feeding portion, having a second feeding point, wherein the second feeding portion extends across the second slot; a second ground plane, wherein the first feeding portion, the second feeding portion, and the second ground plane are all arranged on the second layer of the multi-layer circuit board; and a plurality of conductive through components for coupling the second ground plane to the first ground plane.

[0005] In some embodiments, the first radiating portion and the second radiating portion are each in a square shape.

[0006] In some embodiments, the first slot and the second slot are each in a straight bar shape.

[0007] In some embodiments, the first feeding portion includes a first portion, a second portion, and a third portion, the first portion is coupled to the first feeding point, the third portion is coupled to the first portion via the second portion, and the first portion and the third portion are substantially perpendicular to each other.

[0008] In some embodiments, the second feeding portion includes a fourth portion, a fifth portion, and a sixth portion, the fourth portion is coupled to the second feeding point, the sixth portion is coupled to the fourth portion via the fifth portion, and the fourth portion and the sixth portion are substantially perpendicular to each other.

[0009] In some embodiments, the multi-layer circuit board further includes a third layer, and the second layer is between the first layer and the third layer.

[0010] In some embodiments, the antenna system further includes: a reflective ground plane disposed on the third layer of the multi-layer circuit board, wherein the plurality of conductive through-hole components are further used to couple the reflective ground plane to the second ground plane.

[0011] In some embodiments, the antenna system covers an operating frequency band, and the operating frequency band is between 2400 MHz and 2500 MHz.

[0012] In some embodiments, a length of each of the first radiation portion and the second radiation portion is between 0.25 times and 0.5 times the wavelength of the operating frequency band.

[0013] In some embodiments, a length of each of the first feeding portion and the second feeding portion is substantially equal to 0.25 times the wavelength of the operating frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0015] Figure 1A It is a top view showing a part of components of the antenna system according to an embodiment of the present invention.

[0016] Figure 1B It is a top view showing another part of the components of the antenna system according to an embodiment of the present invention.

[0017] Figure 2 FIG. 4 is a diagram showing the return loss of an antenna system according to an embodiment of the present invention.

[0018] Figure 3 It is an exploded view showing an antenna system according to an embodiment of the present invention.

[0019] Figure 4 The figure shows the radiation pattern of the first radiating portion of the antenna system according to an embodiment of the present invention.

[0020] Figure 5 The figure shows the radiation pattern of the second radiating portion of the antenna system according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 100,300: Antenna system

[0023] 110,310:Multilayer circuit board

[0024] 111: The first layer of a multi-layer circuit board

[0025] 112: The second layer of a multi-layer circuit board

[0026] 120: First radiation part

[0027] 125: First slot

[0028] 130: Second radiation part

[0029] 135: Second slot

[0030] 140: First ground plane

[0031] 150: First feed section

[0032] 151: first end of the first feeding portion

[0033] 152: second end of the first feeding portion

[0034] 154: first part of the first feeding portion

[0035] 155: The second part of the first feeding part

[0036] 156: The third part of the first feeding part

[0037] 160: Second feeding part

[0038] 161: first end of the second feeding portion

[0039] 162: second end of the second feeding portion

[0040] 164: The fourth part of the second feed-in section

[0041] 165: The fifth part of the second feeding part

[0042] 166: The sixth part of the first feeding part

[0043] 170: Second ground plane

[0044] 180-1,180-2,180-N,380-1,380-2,380-M: Conductive feedthrough components

[0045] 191: First signal source

[0046] 192: Second signal source

[0047] 313: The third layer of a multi-layer circuit board

[0048] 395: Reflection ground plane

[0049] D1: Spacing

[0050] FB: Operation frequency band

[0051] FP1: First Feed Point

[0052] FP2: Second feeding point

[0053] L1, L2, L3, L4, L5, L6, L7, L8, L9, L10: Length

[0054] W5,W6,W7,W8,W9,W10: Width

[0055] X: X-axis

[0056] Y: Y axis

[0057] Z: Z axis

[0058] θ1: first obtuse angle

[0059] θ2: Second obtuse angle

[0060] θ3: The third obtuse angle

[0061] θ4: the fourth obtuse angle DETAILED DESCRIPTION

[0062] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are listed below and described in detail with reference to the accompanying drawings.

[0063] Certain words are used in the specification and the scope of the patent application 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. This specification and the scope of the patent application do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. The words "including" and "comprising" mentioned throughout the specification and the scope of the patent application 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.

[0064] 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.

[0065] In addition, spatially relative terms such as "below," "below," "lower," "above," "upper," and similar terms are used to facilitate description of the relationship between one component or feature and another component or feature in the diagram. In addition to the orientation shown in the drawings, these spatially relative terms are intended to include different orientations of the device in use or operation. 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.

[0066] Figure 1A It is a top view showing a part of components of an antenna system 100 according to an embodiment of the present invention. Figure 1B is a top view showing another part of the components of the antenna system 100 according to an embodiment of the present invention. Figure 1A , 1BThe antenna system 100 can be applied to a mobile device, such as a smart phone, a tablet computer, a notebook computer, a wireless access point, a router, or any device with communication function. Alternatively, the antenna system 100 can be applied to an electronic device, such as any unit in the Internet of Things (IOT).

[0067] exist Figure 1A , 1B In the embodiment of the present invention, the antenna system 100 includes: a multilayer circuit board 110, a first radiation element 120, a second radiation element 130, a first ground plane 140, a first feeding element 150, a second feeding element 160, a second ground plane 170, and a plurality of conductive via elements 180-1, 180-2, ..., 180-N, wherein "N" can be any positive integer greater than or equal to 2. The first radiation element 120, the second radiation element 130, the first ground plane 140, the first feeding element 150, the second feeding element 160, and the second ground plane 170 can be made of metal materials, such as copper, silver, aluminum, iron, or alloys thereof.

[0068] The multilayer circuit board 110 includes at least a first layer 111 and a second layer 112, wherein the first layer 111 can be stacked on the second layer 112. For example, the first layer 111 and the second layer 112 of the multilayer circuit board 110 can each be implemented by a FR4 (Flame Retardant 4) substrate, but it is not limited thereto. In some embodiments, the first layer 111 and the second layer 112 of the multilayer circuit board 110 can have the same size and shape, so that the first layer 111 of the multilayer circuit board 110 can just completely cover the second layer 112 thereof.

[0069] The first radiation portion 120 has a first slot 125, which may be a closed slot and may be located at the center of the first radiation portion 120. For example, the first radiation portion 120 may be substantially square, and the first slot 125 may be substantially strip-shaped, but is not limited thereto.

[0070] The second radiating portion 130 has a second slot 135, which may be another closed slot and may be located at the center of the second radiating portion 130. For example, the second radiating portion 130 may be substantially in the shape of another square, and its second slot 135 may be substantially in the shape of another straight bar, but is not limited thereto. In some embodiments, the second slot 135 of the second radiating portion 130 may be substantially aligned with the first slot 125 of the first radiating portion 120. In addition, the second radiating portion 130 may also be disposed adjacent to the first radiating portion 120. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a spacing between two corresponding components that is less than a predetermined distance (e.g., 15 mm or less), but generally does not include a situation where the two corresponding components are in direct contact with each other (i.e., the aforementioned spacing is shortened to 0). In some embodiments, both the first radiating portion 120 and the second radiating portion 130 may be in a floating state.

[0071] For example, the first ground plane 140 may be substantially in the shape of a larger rectangle, but is not limited thereto. In some embodiments, the first radiating portion 120 , the second radiating portion 130 , and the first ground plane 140 may all be disposed on the first layer 111 of the multilayer circuit board 110 , wherein the first radiating portion 120 and the second radiating portion 130 may all be adjacent to the first ground plane 140 .

[0072] The first feeding portion 150 has a first feeding point FP1, wherein the first feeding point FP1 can be further coupled to a first signal source 191. For example, the first signal source 191 can be a radio frequency (RF) module, which can be used to excite the first radiating portion 120. In detail, the first feeding portion 150 has a first end 151 and a second end 152 (i.e., an open end), and includes a first portion 154, a second portion 155, and a third portion 156, wherein the first portion 154 (or the first end 151) is coupled to the first feeding point FP1, and the third portion 156 can be coupled to the first portion 154 via the second portion 155. In the first feeding portion 150, the first portion 154 and the third portion 156 may be substantially perpendicular to each other, a first obtuse angle θ1 may be formed between the second portion 155 and the first portion 154, and a second obtuse angle θ2 may be formed between the second portion 155 and the third portion 156. The third portion 156 (or the second end 152) of the first feeding portion 150 may extend across the center point of the first slot 125 of the first radiating portion 120. In some embodiments, the third portion 156 of the first feeding portion 150 has a first vertical projection on the first radiating portion 120, wherein the first vertical projection may at least partially overlap with the first slot 125 of the first radiating portion 120. That is, although the first feeding portion 150 is disposed adjacent to the first radiating portion 120, the first feeding portion 150 is not in direct contact with the first radiating portion 120.

[0073] The second feeding portion 160 has a second feeding point FP2, wherein the second feeding point FP2 can be further coupled to a second signal source 192. For example, the second signal source 192 can be another RF module, which can be used to excite the second radiating portion 130. In detail, the second feeding portion 160 has a first end 161 and a second end 162 (i.e., another open end), and includes a fourth portion 164, a fifth portion 165, and a sixth portion 166, wherein the fourth portion 164 (or the first end 161) is coupled to the second feeding point FP2, and the sixth portion 166 can be coupled to the fourth portion 164 via the fifth portion 165. In the second feeding portion 160, the fourth portion 164 can be substantially perpendicular to the sixth portion 166, a third obtuse angle θ3 can be formed between the fifth portion 165 and the fourth portion 164, and a fourth obtuse angle θ4 can be formed between the fifth portion 165 and the sixth portion 166. The sixth portion 166 (or the second end 162) of the second feeding portion 160 may extend across the center point of the second slot 135 of the second radiating portion 130. In some embodiments, the sixth portion 166 of the second feeding portion 160 has a second vertical projection on the second radiating portion 130, wherein the second vertical projection may at least partially overlap with the second slot 135 of the second radiating portion 130. That is, although the second feeding portion 160 is disposed adjacent to the second radiating portion 130, the second feeding portion 160 is not in direct contact with the second radiating portion 130.

[0074] For example, the second ground plane 170 may be substantially a smaller rectangle (compared to the first ground plane 140 ), and may be disposed relative to the first ground plane 140 , but is not limited thereto. In some embodiments, the first feeding portion 150 , the second feeding portion 160 , and the second ground plane 170 may all be disposed on the second layer 112 of the multi-layer circuit board 110 .

[0075] The aforementioned conductive through-components 180-1, 180-2, ..., 180-N may penetrate through the first layer 111 and the second layer 112 of the multi-layer circuit board 110, and may be used to couple the second ground plane 170 to the first ground plane 140. It should be understood that, since the second ground plane 170 has a relatively small area, a portion of the plurality of conductive through-components 180-1, 180-2, ..., 180-N may be located outside the second ground plane 170. In some embodiments, the first portion 154 of the first feeding portion 150 and the fourth portion 164 of the second feeding portion 160 may both extend and pass through a plurality of gaps (gaps) between the adjacent conductive through-components 180-1, 180-2, ..., 180-N.

[0076] Figure 21 is a graph showing the return loss of the antenna system 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). Figure 2 According to the measurement results, the antenna system 100 can cover an operational frequency band FB. For example, the operational frequency band FB can be between 2400 MHz and 2500 MHz. Therefore, the antenna system 100 can at least support the broadband operation of Bluetooth Low Energy (BLE) and WLAN (Wireless Local Area Network) 2.4 GHz.

[0077] In some embodiments, the operating principle of the antenna system 100 may be as described below. The first radiating portion 120 and its first slot 125 may be coupled and excited by the first feeding portion 150 to generate the aforementioned operating frequency band FB. Similarly, the second radiating portion 130 and its second slot 135 may be coupled and excited by the second feeding portion 160 to contribute to the aforementioned operating frequency band FB. In order to improve the impedance matching (Impedance Matching) of the antenna system 100, the first feeding portion 150 and the second feeding portion 160 may each have an unequal width structure. According to actual measurement results, the addition of the aforementioned conductive through-hole components 180-1, 180-2, ..., 180-N also helps to suppress the leakage of electromagnetic waves (Leakage of Electromagnetic Waves) of the first feeding portion 150 and the second feeding portion 160, thereby improving the radiation efficiency (Radiation Efficiency) of the antenna system 100.

[0078] In some embodiments, the component dimensions of the antenna system 100 may be as follows. The length L1 of the first radiating portion 120 may be between 0.25 times and 0.5 times the wavelength of the operating frequency band FB of the antenna system 100 (λ / 4-λ / 2), for example, about 0.3 times the wavelength (3λ / 10). The length L2 of the second radiating portion 130 may be between 0.25 times and 0.5 times the wavelength of the operating frequency band FB of the antenna system 100 (λ / 4-λ / 2), for example, about 0.3 times the wavelength (3λ / 10). The length L3 of the first slot 125 may be between 0.125 times and 0.25 times the wavelength of the operating frequency band FB of the antenna system 100 (λ / 8-λ / 4), for example, about 0.2 times the wavelength (λ / 5). The length L4 of the second slot 135 may be between 0.125 times and 0.25 times the wavelength (λ / 8-λ / 4) of the operating frequency band FB of the antenna system 100, for example, about 0.2 times the wavelength (λ / 5). The distance D1 between the first radiating portion 120 and the second radiating portion 130 may be between 8 mm and 12 mm, for example, about 9.9 mm. In the first feeding portion 150, the length L7 of the third portion 156 may be substantially equal to the length L5 of the first portion 154, the length L6 of the second portion 155 may be between 1 mm and 2 mm, the width W5 of the first portion 154 may be between 0.1 mm and 0.3 mm, the width W6 of the second portion 155 may be between 0.1 mm and 0.3 mm, and the width W7 of the third portion 156 may be between 0.5 mm and 0.7 mm. The length of the first feeding portion 150 (i.e., L5+L6+L7) may be substantially equal to 0.25 times the wavelength (λ / 4) of the operating frequency band FB of the antenna system 100. In the second feeding portion 160, the length L10 of the sixth portion 166 may be substantially equal to the length L8 of the fourth portion 164, the length L9 of the fifth portion 165 may be between 1 mm and 2 mm, the width W8 of the fourth portion 164 may be between 0.1 mm and 0.3 mm, the width W9 of the fifth portion 165 may be between 0.1 mm and 0.3 mm, and the width W10 of the sixth portion 166 may be between 0.5 mm and 0.7 mm. The length of the second feeding portion 160 (i.e., L8+L9+L10) may be substantially equal to 0.25 times the wavelength (λ / 4) of the operating frequency band FB of the antenna system 100. The first obtuse angle θ1 may be between 120 degrees and 150 degrees, for example, about 135 degrees. The second obtuse angle θ2 may be between 120 degrees and 150 degrees, for example, about 135 degrees. The third obtuse angle θ3 may be between 120 degrees and 150 degrees, for example, about 135 degrees. The fourth obtuse angle θ4 may be between 120 degrees and 150 degrees, for example, about 135 degrees. The above component size ranges are obtained based on multiple experimental results, which help optimize the operational bandwidth, impedance matching, and radiation efficiency of the antenna system 100.

[0079] Figure 3 It is an exploded view showing an antenna system 300 according to an embodiment of the present invention. Figure 3 and Figure 1A , 1B Similar. Figure 3 In the embodiment, in addition to the aforementioned first layer 111 and second layer 112, a multi-layer circuit board 310 of the antenna system 300 further includes a third layer 313, wherein the second layer 112 is between the first layer 111 and the third layer 313. In addition, the antenna system 300 further includes a reflective ground plane 395, which is made of a metal material and is disposed on the third layer 313 of the multi-layer circuit board 310. In addition, a plurality of conductive through-hole components 380-1, 380-2, ..., 380-M of the antenna system 300 can penetrate the first layer 111, the second layer 112, and the third layer 313 of the multi-layer circuit board 310, and can be used to couple the reflective ground plane 395 to the first ground plane 140 and the second ground plane 170, wherein "M" can be any positive integer greater than or equal to 3. Figure 3 The remaining features of the antenna system 300 are similar to those of the antenna system 100 in FIGS. 1A and 1B , so the two embodiments can achieve similar operating effects.

[0080] Figure 4 FIG. 1 is a diagram showing the radiation pattern of the first radiating portion 120 of the antenna system 300 according to an embodiment of the present invention (which can be measured along the YZ plane). Figure 4 According to the measurement results, the addition of the reflective ground plane 395 helps to improve the radiation gain of the first radiating portion 120 in the +Y-axis direction.

[0081] Figure 5 1 is a diagram showing the radiation pattern of the second radiating portion 130 of the antenna system 300 according to an embodiment of the present invention (which can be measured along the YZ plane). Figure 5 According to the measurement results, the addition of the reflective ground plane 395 also helps to improve the radiation gain of the second radiating portion 130 in the +Y-axis direction.

[0082] The utility model provides a novel antenna system. Compared with the traditional design, the utility model has at least the advantages of small size, wide bandwidth, and high radiation efficiency, so it is very suitable for application in various mobile communication devices or the Internet of Things.

[0083] 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-5 The utility model may only include Figure 1A-5 In other words, not all features shown in the drawings need to be implemented in the antenna system of the present invention at the same time.

[0084] Ordinal numbers in this specification and the scope of patent application, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to mark and distinguish two different components with the same name.

[0085] 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. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the appended claims.

Claims

1. An antenna system, characterized in that: include: A multi-layer circuit board, comprising a first layer and a second layer; A first radiating portion having a first slot; a second radiating portion having a second slot, wherein the second radiating portion is adjacent to the first radiating portion; a first ground plane, wherein the first radiation portion, the second radiation portion, and the first ground plane are all disposed on the first layer of the multi-layer circuit board; A first feeding portion having a first feeding point, wherein the first feeding portion extends across the first slot; A second feeding portion having a second feeding point, wherein the second feeding portion extends across the second slot; a second ground plane, wherein the first feeding portion, the second feeding portion, and the second ground plane are all disposed on the second layer of the multi-layer circuit board; as well as A plurality of conductive through-components are used to couple the second ground plane to the first ground plane.

2. The antenna system according to claim 1, characterized in that The first radiation portion and the second radiation portion are each in a square shape.

3. The antenna system according to claim 1, characterized in that The first slot and the second slot are each in a straight strip shape.

4. The antenna system according to claim 1, characterized in that The first feeding portion includes a first portion, a second portion, and a third portion. The first portion is coupled to the first feeding point, the third portion is coupled to the first portion via the second portion, and the first portion and the third portion are substantially perpendicular to each other.

5. The antenna system according to claim 4, characterized in that The second feeding portion includes a fourth portion, a fifth portion, and a sixth portion. The fourth portion is coupled to the second feeding point. The sixth portion is coupled to the fourth portion via the fifth portion. The fourth portion and the sixth portion are substantially perpendicular to each other.

6. The antenna system according to claim 1, characterized in that The multi-layer circuit board further includes a third layer, and the second layer is between the first layer and the third layer.

7. The antenna system according to claim 6, characterized in that Also includes: A reflective ground plane is disposed on the third layer of the multi-layer circuit board, wherein the plurality of conductive through-components are further used to couple the reflective ground plane to the second ground plane.

8. The antenna system according to claim 1, characterized in that The antenna system covers an operating frequency band between 2400 MHz and 2500 MHz.

9. The antenna system according to claim 8, characterized in that The length of each of the first radiation portion and the second radiation portion is between 0.25 times and 0.5 times the wavelength of the operating frequency band.

10. The antenna system according to claim 8, characterized in that The length of each of the first feeding portion and the second feeding portion is substantially equal to 0.25 times the wavelength of the operating frequency band.

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