Antenna structure

Abstract

This invention discloses an antenna structure, comprising: a grounding element, a first radiating portion, a second radiating portion, a third radiating portion, and a non-conductive support element. The first radiating portion is coupled to a first grounding point on the grounding element. The second radiating portion has a feed point, wherein the second radiating portion is adjacent to the first radiating portion. The third radiating portion is coupled to a second grounding point on the grounding element, wherein the third radiating portion is adjacent to the second radiating portion. The first, second, and third radiating portions are all disposed on the non-conductive support element. The second radiating portion is at least partially surrounded by the first radiating portion, and the third radiating portion is at least partially surrounded by the second radiating portion.

Description

Technical Field

[0001] This invention relates to an antenna structure, and more particularly to a wideband antenna structure. Background Technology

[0002] With the advancement of mobile communication technology, mobile devices have become increasingly common in recent years, such as laptops, mobile phones, multimedia players, and other portable electronic devices with multiple functions. To meet people's needs, mobile devices typically have wireless communication capabilities. Some cover long-range wireless communication ranges; for example, mobile phones use 2G, 3G, and LTE (Long Term Evolution) systems and the frequency bands they use: 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz. Others cover short-range wireless communication ranges; for example, Wi-Fi and Bluetooth systems use the frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz.

[0003] Antennas are indispensable components in wireless communication. If the operating bandwidth of an antenna used for receiving or transmitting signals is too narrow, it can easily lead to a degradation in the communication quality of mobile devices. Therefore, designing a small-size, wide-bandwidth antenna structure is an important task for designers. Summary of the Invention

[0004] In a preferred embodiment, the present invention provides an antenna structure comprising: a grounding element; a first radiating portion coupled to a first grounding point on the grounding element; a second radiating portion having a feed point, wherein the second radiating portion is adjacent to the first radiating portion; a third radiating portion coupled to a second grounding point on the grounding element, wherein the third radiating portion is adjacent to the second radiating portion; and a non-conductive support element, wherein the first radiating portion, the second radiating portion, and the third radiating portion are all disposed on the non-conductive support element; wherein the second radiating portion is at least partially surrounded by the first radiating portion, and the third radiating portion is at least partially surrounded by the second radiating portion.

[0005] In some embodiments, the second radiating portion is substantially located between the first radiating portion and the third radiating portion.

[0006] In some embodiments, the first radiating portion is L-shaped and includes a wider portion and a narrower portion, wherein the narrower portion is coupled to the first grounding point via the wider portion.

[0007] In some embodiments, the second radiating portion has a meandering shape and further includes a first end widening portion.

[0008] In some embodiments, the third radiating portion is in the shape of an inverted U and also includes a second end widening portion.

[0009] In some embodiments, a first coupling gap is formed between the second radiating portion and the first radiating portion, and a second coupling gap is formed between the third radiating portion and the second radiating portion, wherein the width of each of the first coupling gap and the second coupling gap is between 0.5 mm and 3 mm.

[0010] In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, wherein the first frequency band is between 800MHz and 860MHz, the second frequency band is between 1710MHz and 2170MHz, and the third frequency band is between 2500MHz and 2690MHz.

[0011] In some embodiments, the length of the first radiating portion is approximately equal to 0.25 times the wavelength of the first frequency band.

[0012] In some embodiments, the length of the second radiating portion is approximately equal to 0.25 times the wavelength of the second frequency band.

[0013] In some embodiments, the length of the third radiating portion is approximately equal to 0.25 times the wavelength of the third frequency band. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an antenna structure according to an embodiment of the present invention;

[0015] Figure 2 This is a voltage standing wave ratio (VSWR) diagram of an antenna structure according to an embodiment of the present invention.

[0016] Symbol Explanation

[0017] 100: Antenna Structure

[0018] 110: Grounding element

[0019] 120: First Radiation Department

[0020] 121: The first end of the first radiating section

[0021] 122: The second end of the first radiating section

[0022] 124: The wider portion of the first radiating section

[0023] 125: The narrower portion of the first radiating section

[0024] 130: Second Radiation Section

[0025] 131: The first end of the second radiating section

[0026] 132: The second end of the second radiating section

[0027] 138: The widened portion at the first end of the second radiating section

[0028] 140: Third Radiation Section

[0029] 141: The first end of the third radiating section

[0030] 142: The second end of the third radiating section

[0031] 148: The widened portion at the second end of the third radiating section

[0032] 149: Gap

[0033] 170: Non-conductor support element

[0034] 190: Signal Source

[0035] D1: Spacing

[0036] FB1: First Band

[0037] FB2: Second Band

[0038] FB3: Third Band

[0039] FP: Feed Point

[0040] GC1: First coupling gap

[0041] GC2: Second coupling gap

[0042] GP1: First grounding point

[0043] GP2: Second grounding point

[0044] L1, L2, L3: Length

[0045] W11, W12, W2, W3, WA, WB: Width Detailed Implementation

[0046] To make the objectives, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0047] Certain terms are used in the specification and claims to refer to specific elements. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The term "generally" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain margin of error. Furthermore, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described as 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.

[0048] The following disclosure provides many different embodiments or examples to implement the various features of this invention. The following disclosure describes specific examples of the various components and their arrangements for simplification. Of course, these specific examples are not intended to be limiting. For example, if this invention describes a first feature formed on or above a second feature, it indicates that it may include embodiments where the first and second features are in direct contact, or embodiments where an additional feature is formed between the first and second features, so that the first and second features may not be in direct contact. Furthermore, the same reference numerals and / or designations may be repeated in different examples of the following disclosure. These repetitions are for simplification and clarity and are not intended to limit the specific relationship between the different embodiments and / or structures discussed.

[0049] Furthermore, spatially related terms, such as "below," "lower," "above," "higher," and similar terms, are used to facilitate the description of the relationship between one element or feature and another element(s) in the illustration. In addition to the orientations shown in the accompanying drawings, these spatially related terms are intended to encompass different orientations of the device in use or operation. The device may be rotated to different orientations (90 degrees or other orientations), and the spatially related terms used herein can be interpreted in the same way.

[0050] Figure 1This is a schematic diagram showing an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be incorporated into a mobile device, such as a smartphone, tablet computer, notebook computer, wireless access point, router, or any device with communication capabilities. Alternatively, the antenna structure 100 can be incorporated into an electronic device, such as any unit in an Internet of Things (IoT) network.

[0051] exist Figure 1 In one embodiment, the antenna structure 100 includes: a ground element 110, a first radiating element 120, a second radiating element 130, a third radiating element 140, and a nonconductive support element 170, wherein the ground element 110, the first radiating element 120, the second radiating element 130, and the third radiating element 140 can all be made of metal, such as copper, silver, aluminum, iron, or their alloys.

[0052] The grounding element 110 may be implemented by a ground copper foil, which can provide a ground voltage. For example, the grounding element 110 may be coupled to a system ground plane (not shown) of the antenna structure 100.

[0053] The first radiating portion 120 can generally be L-shaped. Specifically, the first radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the first radiating portion 120 is coupled to a first grounding point GP1 on the grounding element 110, and the second end 122 of the first radiating portion 120 is an open end. In some embodiments, the first radiating portion 120 includes a wider portion 124 adjacent to the first end 121 and a narrower portion 125 adjacent to the second end 122, wherein the narrower portion 125 is coupled to the first grounding point GP1 via the wider portion 124. It should be noted that the terms "adjacent" or "adjacent" in this specification can refer to a distance between two corresponding elements being less than a predetermined distance (e.g., 10 mm or less), or it can include the case where the two corresponding elements are in direct contact with each other (i.e., the aforementioned distance is reduced to 0).

[0054] The second radiating portion 130 may generally have a meandering shape. The second radiating portion 130 may be at least partially surrounded by the first radiating portion 120. Furthermore, the second radiating portion 130 is adjacent to the first radiating portion 120, wherein a first coupling gap GC1 may be formed between the second radiating portion 130 and the first radiating portion 120. Specifically, the second radiating portion 130 has a first end 131 and a second end 132, wherein a feeding point FP is located at the first end 131 of the second radiating portion 130, and the second end 132 of the second radiating portion 130 is an open-circuit end. The feeding point FP may also be coupled to a signal source 190. The signal source 190 may be a radio frequency (RF) module, which can be used to excite the antenna structure 100. For example, the second end 132 of the second radiating portion 130 and the second end 122 of the first radiating portion 120 may extend in generally the same direction. In some embodiments, the second radiating portion 130 further includes a first terminal widening portion 138 located at the second end 132 of the second radiating portion 130. For example, the first terminal widening portion 138 of the second radiating portion 130 may be generally rectangular, but is not limited thereto. In other embodiments, the first terminal widening portion 138 of the second radiating portion 130 may also be circular, elliptical, triangular, or trapezoidal.

[0055] The third radiating portion 140 may generally be in the shape of an inverted U. The third radiating portion 140 may be at least partially surrounded by the second radiating portion 130. Furthermore, the third radiating portion 140 is adjacent to the second radiating portion 130, wherein a second coupling gap GC2 may be formed between the third radiating portion 140 and the second radiating portion 130. In some embodiments, the second radiating portion 130 is generally located between the first radiating portion 120 and the third radiating portion 140. Specifically, the third radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the third radiating portion 140 is coupled to a second grounding point GP2 on the grounding element 110, and the second end 142 of the third radiating portion 140 is an open-circuit end. For example, the second end 142 of the third radiating portion 140 and the second end 122 of the first radiating portion 120 may extend in generally the same direction. The second grounding point GP2 may be different from the aforementioned first grounding point GP1, wherein the feed point FP may be generally located between the first grounding point GP1 and the second grounding point GP2. In some embodiments, the third radiating portion 140 further includes a second end widening portion 148 located at the second end 142 of the third radiating portion 140. For example, the second end widening portion 148 of the third radiating portion 140 may generally be a square with a notch 149, but is not limited thereto. In other embodiments, the second end widening portion 148 of the third radiating portion 140 may also be a circle, an ellipse, a triangle, or a trapezoid.

[0056] The non-conductive support element 170 can be an FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). The first radiating portion 120, the second radiating portion 130, and the third radiating portion 140 can all be disposed on the same surface of the non-conductive support element 170, allowing the antenna structure 100 to be a planar antenna structure. However, the invention is not limited to this. In other embodiments, the first radiating portion 120, the second radiating portion 130, and the third radiating portion 140 can also be disposed on different surfaces of the non-conductive support element 170 to form a three-dimensional antenna structure.

[0057] Figure 2 This is a voltage standing wave ratio (VSWR) graph showing the antenna structure 100 according to an embodiment of the present invention, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio. According to... Figure 2Based on the measurement results, antenna structure 100 can cover a first frequency band FB1, a second frequency band FB2, and a third frequency band FB3. For example, the first frequency band FB1 can be between 800MHz and 860MHz, the second frequency band FB2 can be between 1710MHz and 2170MHz, and the third frequency band FB3 can be between 2500MHz and 2690MHz. Therefore, antenna structure 100 will at least support broadband operation of LTE (Long Term Evolution).

[0058] In some embodiments, the operating principle of the antenna structure 100 may be as follows. The second radiating element 130 can be individually excited to generate the aforementioned second frequency band FB2. The first radiating element 120 can be coupled and excited by the second radiating element 130 to form the aforementioned first frequency band FB1. The third radiating element 140 can be coupled and excited by the second radiating element 130 to form the aforementioned third frequency band FB3. Based on actual measurement results, the first end widening portion 138 of the second radiating element 130 can be used to fine-tune the impedance matching of the aforementioned first frequency band FB1. Furthermore, the second end widening portion 148 of the third radiating element 140 can be used to simultaneously fine-tune the impedance matching of the aforementioned second frequency band FB2 and third frequency band FB3. It should be noted that since all radiating elements corresponding to LTE communication can be integrated into a single antenna structure 100, the overall size of the antenna structure 100 can be effectively miniaturized.

[0059] In some embodiments, the component dimensions of the antenna structure 100 may be as described below. The length L1 of the first radiating portion 120 may be approximately equal to 0.25 times the wavelength (λ / 4) of the first frequency band FB1 of the antenna structure 100. In the first radiating portion 120, the width W11 of the wider portion 124 may be between 3.5 mm and 4.5 mm, while the width W12 of the narrower portion 125 may be between 2.5 mm and 3.5 mm. The length L2 of the second radiating portion 130 may be approximately equal to 0.25 times the wavelength (λ / 4) of the second frequency band FB2 of the antenna structure 100. The width WA of the first end widening portion 138 of the second radiating portion 130 may be between 5 mm and 7 mm. The width W2 of the remaining portion of the second radiating portion 130 may be between 1 mm and 3 mm. The width WB of the second end widening portion 148 of the third radiating portion 140 may be between 5 mm and 8 mm. The width W3 of the remaining portion of the third radiating portion 140 may be between 1 mm and 3 mm. The width of the first coupling gap GC1 can be between 0.5 mm and 3 mm. The width of the second coupling gap GC2 can be between 0.5 mm and 3 mm. The distance D1 between the widened portion 138 at the first end of the second radiating part 130 and the second end 122 of the first radiating part 120 can be between 10 mm and 13 mm. The above dimensions and parameter ranges are derived from the results of multiple experiments and help to optimize the operating bandwidth and impedance matching of the antenna structure 100.

[0060] In some embodiments, the aforementioned antenna structure 100 can be applied to a point-of-sale (POS) system (not shown). Since the POS system includes the aforementioned antenna structure 100, it will be able to support wireless communication functionality. In some embodiments, the POS system may also include a radio frequency (RF) circuit, a filter, an amplifier, a processor, and / or a housing, but is not limited thereto.

[0061] This invention proposes a novel antenna structure. Compared with traditional designs, this invention has advantages such as small size, wide bandwidth, and low manufacturing cost, making it well-suited for various mobile communication devices or the Internet of Things.

[0062] It is worth noting that the component dimensions, shapes, and frequency ranges described above are not limiting factors of this invention. Antenna designers can adjust these settings according to different needs. The antenna structure of this invention is not limited to... Figures 1-2The state illustrated. This invention may include only... Figures 1-2 Any one or more features of any one or more embodiments. In other words, not all the features illustrated need to be implemented simultaneously in the antenna structure of the present invention.

[0063] The ordinal numbers in this specification and claims, such as "first," "second," "third," etc., are not sequential in any particular order; they are only used to distinguish between two different elements with the same name.

[0064] Although the present invention has been disclosed in conjunction with the above preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An antenna structure, comprising: Grounding element; The first radiating part is coupled to the first grounding point on the grounding element; A second radiating section has a feed point, wherein the second radiating section is adjacent to the first radiating section; A third radiating part is coupled to a second grounding point on the grounding element, wherein the third radiating part is adjacent to the second radiating part; as well as A non-conductive support element, wherein the first radiating portion, the second radiating portion, and the third radiating portion are all disposed on the non-conductive support element; The second radiating portion is at least partially surrounded by the first radiating portion, and the third radiating portion is at least partially surrounded by the second radiating portion. The third radiating part is in the shape of an inverted U and also includes a second widened portion at the end. The second widened portion at the end of the third radiating part is a square with a notch.

2. The antenna structure as claimed in claim 1, wherein the second radiating part is located between the first radiating part and the third radiating part.

3. The antenna structure of claim 1, wherein the first radiating portion is L-shaped and includes a wider portion and a narrower portion, and the narrower portion is coupled to the first grounding point via the wider portion.

4. The antenna structure of claim 1, wherein the second radiating portion has a meandering shape and further includes a first end widening portion.

5. The antenna structure as claimed in claim 1, wherein a first coupling gap is formed between the second radiating portion and the first radiating portion, and a second coupling gap is formed between the third radiating portion and the second radiating portion, wherein the width of each of the first coupling gap and the second coupling gap is between 0.5 mm and 3 mm.

6. The antenna structure as claimed in claim 1, wherein the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band being between 800MHz and 860MHz, the second frequency band being between 1710MHz and 2170MHz, and the third frequency band being between 2500MHz and 2690MHz.

7. The antenna structure as claimed in claim 6, wherein the length of the first radiating part is equal to 0.25 times the wavelength of the first frequency band.

8. The antenna structure as claimed in claim 6, wherein the length of the second radiating part is equal to 0.25 times the wavelength of the second frequency band.

9. The antenna structure as claimed in claim 6, wherein the length of the third radiating part is equal to 0.25 times the wavelength of the third frequency band.

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