Antenna structure

Abstract

This invention discloses an antenna structure, comprising: a first radiating portion, a second radiating portion, a third radiating portion, a fourth radiating portion, a fifth radiating portion, and a dielectric substrate. The first radiating portion has a feed point. The second radiating portion is coupled to the first radiating portion. The third radiating portion is coupled to a first ground point. The third radiating portion is also coupled to a second ground point via the fourth radiating portion. The fifth radiating portion is coupled to the third and fourth radiating portions, wherein the fifth radiating portion is adjacent to the second radiating portion. The first, second, third, fourth, and fifth radiating portions are all disposed on the dielectric substrate. The first and second radiating portions are at least partially surrounded by the third, fourth, and fifth radiating portions.

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 first radiating portion having a feed point; a second radiating portion coupled to the first radiating portion; a third radiating portion coupled to a first ground point; a fourth radiating portion, wherein the third radiating portion is further coupled to a second ground point via the fourth radiating portion; a fifth radiating portion coupled to the third radiating portion and the fourth radiating portion, wherein the fifth radiating portion is adjacent to the second radiating portion; and a dielectric substrate, wherein the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, and the fifth radiating portion are all disposed on the dielectric substrate; wherein the first radiating portion and the second radiating portion are at least partially surrounded by the third radiating portion, the fourth radiating portion, and the fifth radiating portion.

[0005] In some embodiments, the combination of the first radiating portion and the second radiating portion presents an L-shape.

[0006] In some embodiments, the third radiating portion and the fourth radiating portion are used to avoid the surrounding environment from negatively affecting the radiation performance of the antenna structure.

[0007] In some embodiments, the fourth radiating portion further has a hollowed-out portion.

[0008] In some embodiments, the antenna structure further includes a sixth radiating portion coupled to the first radiating portion, wherein the sixth radiating portion and the second radiating portion extend in substantially opposite directions.

[0009] In some embodiments, the antenna structure further includes a seventh radiating portion coupled to the third radiating portion, wherein the seventh radiating portion is adjacent to the sixth radiating portion.

[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 700MHz and 900MHz, the second frequency band is between 1700MHz and 2200MHz, and the third frequency band is between 2500MHz and 2700MHz.

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

[0012] In some embodiments, the total length of the third radiating portion and the fourth radiating portion is approximately equal to 0.5 times the wavelength of the first frequency band.

[0013] In some embodiments, the total length of the third radiating portion and the fifth radiating portion is approximately equal to 1.5 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] Figure 3 This is a schematic diagram of a sales time information system according to an embodiment of the present invention.

[0017] Symbol Explanation

[0018] 100: Antenna Structure

[0019] 110: First Radiation Department

[0020] 111: The first end of the first radiating section

[0021] 112: The second end of the first radiating section

[0022] 120: Second Radiation Section

[0023] 121: The first end of the second radiating section

[0024] 122: The second end of the second radiating section

[0025] 130: Third Radiation Section

[0026] 131: The first end of the third radiating section

[0027] 132: The second end of the third radiating section

[0028] 140: Fourth Radiation Department

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

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

[0031] 144: The hollowed-out section of the fourth radiating part

[0032] 150: Fifth Radiation Department

[0033] 151: The first end of the fifth radiating section

[0034] 152: The second end of the fifth radiating section

[0035] 160: Sixth Radiation Department

[0036] 161: The first end of the sixth radiating section

[0037] 162: The second end of the sixth radiating section

[0038] 170: Seventh Radiation Department

[0039] 171: The first end of the seventh radiating section

[0040] 172: The second end of the seventh radiating section

[0041] 180: Dielectric substrate

[0042] 181: First opening

[0043] 182: Second opening

[0044] 183: Third opening

[0045] 190: Signal Source

[0046] 300: Point-of-Sale Information System

[0047] CP: Connection Point

[0048] FB1: First Band

[0049] FB2: Second Band

[0050] FB3: Third Band

[0051] FP: Feed Point

[0052] GC1: First coupling gap

[0053] GC2: Second coupling gap

[0054] GP1: First grounding point

[0055] GP2: Second grounding point

[0056] L1, L2, L3, L4, L5, LH: Length

[0057] VSS: Grounding Potential

[0058] WH: Width Detailed Implementation

[0059] 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.

[0060] 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.

[0061] The following disclosure provides numerous 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 disclosure 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 any specific relationship between the different embodiments and / or structures discussed.

[0062] 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(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.

[0063] Figure 1 This 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.

[0064] like Figure 1As shown, the antenna structure 100 includes at least: a first radiating element 110, a second radiating element 120, a third radiating element 130, a fourth radiating element 140, a fifth radiating element 150, and a dielectric substrate 180, wherein the first radiating element 110, the second radiating element 120, the third radiating element 130, the fourth radiating element 140, and the fifth radiating element 150 can all be made of metal materials, such as copper, silver, aluminum, iron, or their alloys.

[0065] The first radiating section 110 can be generally shaped like a straight strip. Specifically, the first radiating section 110 has a first end 111 and a second end 112, wherein a feeding point FP is located at the first end 111 of the first radiating section 110. The feeding point FP can also be coupled to a signal source 190. For example, the signal source 190 can be a radio frequency (RF) module, which can be used to excite the antenna structure 100.

[0066] The second radiating portion 120 can generally be a long, straight strip, and can be generally perpendicular to the first radiating portion 110. For example, the combination of the first radiating portion 110 and the second radiating portion 120 can generally form an L-shape. In detail, the second radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the second radiating portion 120 is coupled to the second end 112 of the first radiating portion 110, and the second end 122 of the second radiating portion 120 is an open end.

[0067] The third radiating section 130 can generally exhibit a meandering shape. Specifically, the third radiating section 130 has a first end 131 and a second end 132, wherein the first end 131 of the third radiating section 130 is coupled to a first grounding point GP1. The first grounding point GP1 can also be coupled to a ground voltage VSS. For example, the ground voltage VSS can be provided by a system ground plane (not shown).

[0068] The fourth radiating portion 140 may generally exhibit another meandering shape. Specifically, the fourth radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the fourth radiating portion 140 is coupled to a second grounding point GP2, and the second end 142 of the fourth radiating portion 140 is coupled to the second end 132 of the third radiating portion 130. That is, the third radiating portion 130 may be coupled to the second grounding point GP2 via the fourth radiating portion 140, wherein the second grounding point GP2 may also be coupled to a grounding potential VSS. In some embodiments, the fourth radiating portion 140 further has a hollow portion 144. For example, the hollow portion 144 of the fourth radiating portion 140 may generally be trapezoidal or semi-circular, but is not limited to these forms.

[0069] The fifth radiating portion 150 may generally be U-shaped. Specifically, the fifth radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the fifth radiating portion 150 is coupled to the second end 132 of the third radiating portion 130 and the second end 142 of the fourth radiating portion 140, while the second end 152 of the fifth radiating portion 150 is an open-circuit end. For example, the second end 152 of the fifth radiating portion 150 and the second end 122 of the second radiating portion 120 may extend in generally the same direction. The fifth radiating portion 150 is adjacent to the second radiating portion 120. It should be noted that the terms "adjacent" or "adjacent" in this specification may refer to a distance between corresponding two elements that is less than a predetermined distance (e.g., 5 mm or less), but generally does not include cases where corresponding two elements are in direct contact with each other (i.e., the aforementioned distance is reduced to 0). In some embodiments, a first coupling gap GC1 is formed between the fifth radiating portion 150 and the second radiating portion 120. It should be noted that the first radiating part 110 and the second radiating part 120 are at least partially surrounded by the third radiating part 130, the fourth radiating part 140, and the fifth radiating part 150.

[0070] In some embodiments, the antenna structure 100 further includes a sixth radiating element 160, which may be made of metal. The sixth radiating element 160 may generally be a straight strip of unequal width. Specifically, the sixth radiating element 160 has a first end 161 and a second end 162, wherein the first end 161 of the sixth radiating element 160 is coupled to the second end 112 of the first radiating element 110, and the second end 162 of the sixth radiating element 160 is an open-circuit end. For example, the second end 162 of the sixth radiating element 160 and the second end 122 of the second radiating element 120 may extend in generally opposite and distant directions. In some embodiments, the combination of the first radiating element 110, the second radiating element 120, and the sixth radiating element 160 generally forms a T-shape. It must be understood that the sixth radiating element 160 is only an optional component and may be removed in other embodiments.

[0071] In some embodiments, the antenna structure 100 further includes a seventh radiating element 170, which may be made of metal. The seventh radiating element 170 may generally be a short, straight strip. Specifically, the seventh radiating element 170 has a first end 171 and a second end 172, wherein the first end 171 of the seventh radiating element 170 is coupled to a connection point CP on the third radiating element 130, and the second end 172 of the seventh radiating element 170 is an open-circuit end. For example, the seventh radiating element 170 is adjacent to the sixth radiating element 160 and may be generally perpendicular to the sixth radiating element 160. In some embodiments, a second coupling gap GC2 is formed between the seventh radiating element 170 and the sixth radiating element 160. It must be understood that the seventh radiating element 170 is only another optional element and may be removed in other embodiments.

[0072] In some embodiments, the third radiating portion 130 further has a first opening 181, which may be adjacent to the seventh radiating portion 170. In some embodiments, the fourth radiating portion 140 further has a second opening 182 and a third opening 183, wherein the second opening 182 may be adjacent to the first end 141 of the fourth radiating portion 140, and the third opening 183 may be adjacent to the second end 142 of the fourth radiating portion 140. For example, each of the first opening 181, the second opening 182, and the third opening 183 may be generally circular, square, or equilateral triangular, but is not limited thereto. In some embodiments, the third radiating portion 130 and the fourth radiating portion 140 may be fixed to the dielectric substrate 180 by using the first opening 181, the second opening 182, and the third opening 183. However, the invention is not limited thereto. In other embodiments, the first opening 181, the second opening 182, and the third opening 183 may also be filled with a metallic material.

[0073] The dielectric substrate 180 can be an FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). The first radiating portion 110, the second radiating portion 120, the third radiating portion 130, the fourth radiating portion 140, the fifth radiating portion 150, the sixth radiating portion 160, and the seventh radiating portion 170 can all be disposed on the same surface of the dielectric substrate 180, so that the antenna structure 100 can be a planar antenna structure. However, the present invention is not limited thereto. In other embodiments, the first radiating portion 110, the second radiating portion 120, the third radiating portion 130, the fourth radiating portion 140, the fifth radiating portion 150, the sixth radiating portion 160, and the seventh radiating portion 170 can also be disposed on different surfaces of the dielectric substrate 180 to form a three-dimensional antenna structure.

[0074] 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 2 Based 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 700MHz and 900MHz, the second frequency band FB2 can be between 1700MHz and 2200MHz, and the third frequency band FB3 can be between 2500MHz and 2700MHz. Therefore, antenna structure 100 will at least support broadband operation of LTE (Long Term Evolution).

[0075] In some embodiments, the operating principle of the antenna structure 100 may be as follows. The first radiating section 110 and the second radiating section 120 can be excited to generate the aforementioned second frequency band FB2. The third radiating section 130 and the fourth radiating section 140 can be coupled and excited by the first radiating section 110 and the second radiating section 120 to form the aforementioned first frequency band FB1. The third radiating section 130 and the fifth radiating section 150 can be coupled and excited by the first radiating section 110 and the second radiating section 120 to form the aforementioned third frequency band FB3. According to actual measurement results, the third radiating section 130 and the fourth radiating section 140 can be used to avoid the negative impact of the surrounding environment (perhaps the presence of nearby metal components) on the radiation performance of the antenna structure 100. Furthermore, the cutout portion 144 of the fourth radiating section 140 can be used to provide an additional current path, thereby increasing the operational bandwidth of the first frequency band FB1. It should be noted that since all the 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.

[0076] In some embodiments, the component dimensions of the antenna structure 100 may be as described below. The total length L1 of the first radiating section 110 and the second radiating section 120 may be approximately equal to 0.25 times the wavelength (λ / 4) of the second frequency band FB2 of the antenna structure 100. The total length L2 of the third radiating section 130 and the fourth radiating section 140 may be approximately equal to 0.5 times the wavelength (λ / 2) of the first frequency band FB1 of the antenna structure 100. The total length L3 of the third radiating section 130 and the fifth radiating section 150 may be approximately equal to 1.5 times the wavelength (3λ / 2) of the third frequency band FB3 of the antenna structure 100, or approximately equal to 0.5 times the wavelength (λ / 2) of the first frequency band FB1 of the antenna structure 100. The length L4 of the sixth radiating section 160 may be between 5 mm and 15 mm. The length L5 of the seventh radiating section 170 may be between 3 mm and 7 mm. In the fourth radiating section 140, the length LH of the cutout portion 144 can be between 10 mm and 14 mm, while the width WH of the cutout portion 144 can be between 3 mm and 7 mm. The above dimensions and parameter ranges are derived from the results of multiple experiments, which helps to optimize the operating bandwidth and impedance matching of the antenna structure 100.

[0077] Figure 3 This is a schematic diagram showing a Point of Sale (POS) system 300 according to an embodiment of the present invention. Figure 3In some embodiments, the point-of-sale information system 300 includes the aforementioned antenna structure 100, thus enabling the point-of-sale information system 300 to support wireless communication functionality. In some embodiments, the point-of-sale information system 300 may also include a radio frequency circuit, a filter, an amplifier, a processor, and / or a housing, but is not limited thereto. It should be noted that the antenna structure 100 may be slightly adjusted in its three-dimensional structure according to the shape of the point-of-sale information system 300 without affecting its communication quality. Figure 3 The remaining features of the point-of-sale information system 300 are all the same as Figure 1 Since the antenna structures are similar to those of the 100, both embodiments can achieve similar operational effects.

[0078] 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.

[0079] 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 1-3 The state illustrated. This invention may include only... Figures 1-3 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.

[0080] 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.

[0081] While the present invention has been disclosed above with reference to 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 defined by the appended claims.

Claims

1. An antenna structure, comprising: The first radiating section has a feed point; The second radiating part is coupled to the first radiating part; The third radiating section is coupled to the first grounding point; The fourth radiating part, wherein the third radiating part is also coupled to the second grounding point via the fourth radiating part; The fifth radiating part is coupled to the third radiating part and the fourth radiating part, wherein the fifth radiating part is adjacent to the second radiating part; as well as A dielectric substrate, wherein the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, and the fifth radiating portion are all disposed on the dielectric substrate; The first radiating portion and the second radiating portion are at least partially surrounded by the third radiating portion, the fourth radiating portion, and the fifth radiating portion. The fourth radiating section also has a hollowed-out portion. A first coupling gap is formed between the fifth radiating part and the second radiating part.

2. The antenna structure as claimed in claim 1, wherein the combination of the first radiating part and the second radiating part presents an L-shape.

3. The antenna structure as claimed in claim 1, wherein the third radiating part and the fourth radiating part are used to avoid the surrounding environment from negatively affecting the radiation performance of the antenna structure.

4. The antenna structure as described in claim 1, further comprising: A sixth radiating part is coupled to the first radiating part, wherein the sixth radiating part and the second radiating part extend in substantially opposite directions.

5. The antenna structure as described in claim 4, further comprising: A seventh radiating part is coupled to the third radiating part, wherein the seventh radiating part is adjacent to the sixth radiating part.

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 700MHz and 900MHz, the second frequency band being between 1700MHz and 2200MHz, and the third frequency band being between 2500MHz and 2700MHz.

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

8. The antenna structure as claimed in claim 6, wherein the total length of the third radiating part and the fourth radiating part is approximately equal to 0.5 times the wavelength of the first frequency band.

9. The antenna structure as claimed in claim 6, wherein the total length of the third radiating part and the fifth radiating part is approximately equal to 1.5 times the wavelength of the third frequency band.

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