Antenna structure

Abstract

An antenna structure is disclosed. The antenna structure includes: a grounding element, a feed radiator, a short-circuit radiator, a connecting radiator, a first radiator, and a second radiator. The feed radiator has a feed point and is coupled to the grounding element via the short-circuit radiator. The connecting radiator is coupled between the first radiator and the short-circuit radiator. The second radiator is coupled to the feed radiator. A coupling slot region is formed and is generally surrounded by the feed radiator, the short-circuit radiator, the connecting radiator, the first radiator, and the second radiator. Compared to conventional designs, the antenna structure of this invention has advantages such as low specific absorption rate, small size, wide bandwidth, and low manufacturing cost, making it well-suited for use in various mobile communication devices.

Description

Technical Field

[0001] This invention relates to an antenna structure, and more particularly to an antenna structure that can reduce a specific absorption rate. 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, such as mobile phones using 2G, 3G, and LTE (Long Term Evolution) systems, which use frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz. Others cover short-range wireless communication, such as Wi-Fi and Bluetooth systems, which use frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz.

[0003] Antennas are indispensable components in mobile devices that support wireless communication. However, antennas are easily affected by nearby conductive elements, often causing interference and a decline in overall communication quality, or resulting in excessively high Specific Absorption Rate (SAR) that fails to meet regulatory requirements. Therefore, a novel solution is needed to overcome the problems faced by traditional technologies.

[0004] Therefore, an antenna structure is needed to solve the above problems. Summary of the Invention

[0005] In a preferred embodiment, the present invention provides an antenna structure comprising: a grounding element; a feed radiator having a feed point; a short-circuit radiator, wherein the feed radiator is coupled to the grounding element via the short-circuit radiator; a connecting radiator; a first radiator, wherein the connecting radiator is coupled between the first radiator and the short-circuit radiator; and a second radiator coupled to the feed radiator; wherein a coupling slot region is formed and is generally surrounded by the feed radiator, the short-circuit radiator, the connecting radiator, the first radiator, and the second radiator.

[0006] In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

[0007] In some embodiments, the coupling slot region is used to reduce a specific absorption rate of the antenna structure in a first frequency band, a second frequency band, and a third frequency band.

[0008] In some embodiments, the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5150MHz and 5850MHz, and the third frequency band is between 5875MHz and 7125MHz.

[0009] In some embodiments, the grounding element further includes a protruding branch.

[0010] In some embodiments, the short-circuit radiating section includes a grounding branch coupled to a grounding element.

[0011] In some embodiments, the connecting radiating section further includes an extension branch.

[0012] In some embodiments, the extended branch forms a triangle.

[0013] In some embodiments, the second radiating portion is a straight strip of unequal width.

[0014] In some embodiments, the second radiating portion includes a wider portion and a narrower portion, with the narrower portion coupled to the feed radiating portion via the wider portion.

[0015] In some embodiments, the second radiating portion and the first radiating portion extend in substantially the same direction.

[0016] In some embodiments, the total length of the feed radiator, the short-circuit radiator, the connecting radiator, and the first radiator is approximately equal to 0.25 times the wavelength of the first frequency band.

[0017] In some embodiments, the total length of the feed radiator, the short-circuit radiator, and the connecting radiator is approximately equal to 0.25 times the wavelength of the second frequency band.

[0018] In some embodiments, the total length of the feed radiator and the second radiator is approximately equal to 0.25 times the wavelength of the third frequency band.

[0019] In some embodiments, the width ratio of the short-circuit radiating portion to the first radiating portion is between 0.5 and 1.5.

[0020] In some embodiments, the width of the coupling slot area is between 0.15 mm and 3.5 mm.

[0021] In some embodiments, a first current flows through a first radiating section, and a second current flows through a second radiating section, a feed radiating section, and a short-circuit radiating section, wherein the second current and the first current have substantially opposite directions.

[0022] In some embodiments, the antenna structure further includes a dielectric substrate, wherein the feed radiating portion, the short-circuit radiating portion, the connection radiating portion, the first radiating portion, and the second radiating portion are all disposed on the dielectric substrate.

[0023] In some embodiments, the dielectric substrate is a flexible circuit board or a printed circuit board.

[0024] This invention proposes a novel antenna structure. Compared to traditional designs, this invention offers advantages such as low specific absorption rate, small size, wide bandwidth, and low manufacturing cost, making it well-suited for use in a wide variety of mobile communication devices. Attached Figure Description

[0025] Figure 1 This shows a top view of an antenna structure according to an embodiment of the present invention.

[0026] Figure 2 This diagram shows the current distribution of an antenna structure according to an embodiment of the present invention.

[0027] Figure 3 This shows a top view of an antenna structure according to another embodiment of the present invention.

[0028] Explanation of key component symbols:

[0029] 100 and 300 antenna structures

[0030] 110, 310 grounding elements

[0031] 115 Protruding branch of grounding element

[0032] 120° and 320° feed radiators

[0033] 121 First end of the feed radiator

[0034] 122 Second end of the feed radiator

[0035] 130, 330 short-circuit radiation section

[0036] 131 The first end of the short-circuit radiating section

[0037] 132 The second end of the short-circuit radiating section

[0038] 135 Grounding branch of short-circuit radiation section

[0039] 140, 340 connecting radiating section

[0040] 141 The first end connecting the radiating section

[0041] 142 The second end connecting the radiating section

[0042] 143 Side connecting the radiating section

[0043] 145 Extension branch connecting the radiating section

[0044] 150, 350 First Radiation Section

[0045] 151 First end of the first radiating section

[0046] 152 The second end of the first radiating section

[0047] 160°, 360° Second Radiation Section

[0048] 161 The first end of the second radiating section

[0049] 162 The second end of the second radiating section

[0050] 164 The wider portion of the second radiating section

[0051] 165 Narrower section of the second radiating part

[0052] 170 and 370 coupling slot areas

[0053] 171 Closed end of coupling slot region

[0054] 172 Opening end of the coupling slot area

[0055] 180, 380 dielectric substrates

[0056] 190 signal source

[0057] D1 Spacing

[0058] FP feed point

[0059] I1 First Current

[0060] I2 Second Current

[0061] Lengths of L1, L2, and L3

[0062] W1, W2, WS width Detailed Implementation

[0063] 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 detail with reference to the accompanying drawings.

[0064] 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.

[0065] 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 specification 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 additional features are 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 specification. These repetitions are for simplification and clarity and are not intended to limit any specific relationship between the different embodiments or / and structures discussed.

[0066] Furthermore, spatially related terms such as "below," "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.

[0067] Figure 1This diagram shows a top view of an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, such as a smartphone, a tablet computer, or a notebook computer. Figure 1 In one embodiment, the antenna structure 100 includes at least: a ground element 110, a feeding radiation element 120, a shorting radiation element 130, a connection radiation element 140, a first radiation element 150, and a second radiation element 160. The ground element 110, the feeding radiation element 120, the shorting radiation element 130, the connection radiation element 140, the first radiation element 150, and the second radiation element 160 can all be made of metal, such as copper, silver, aluminum, iron, or alloys thereof.

[0068] The grounding element 110 may be a system ground plane, which can be used to provide a ground voltage. The shape of the grounding element 110 is not particularly limited in this invention. In some embodiments, the grounding element 110 may also include a protruding branch 115, which may be generally rectangular.

[0069] The feed radiator 120 can be generally shaped like a straight strip. Specifically, the feed radiator 120 has a first end 121 and a second end 122, with a feeding point FP located at the first end 121. The feeding point FP can also be coupled to a positive electrode of a signal source 190. For example, the signal source 190 can be a radio frequency (RF) module used to excite the antenna structure 100. Additionally, a negative electrode of the signal source 190 can be coupled to a protruding branch 115 of the grounding element 110. In some embodiments, the signal source 190 is also coupled to the feed radiator 120 via a coaxial cable, wherein a central conductive line of this coaxial cable is coupled to the feeding point FP, and a conductive housing of this coaxial cable is coupled to the protruding branch 115.

[0070] The short-circuit radiating section 130 may be generally irregular in shape. Specifically, the short-circuit radiating section 130 has a first end 131 and a second end 132, wherein the first end 131 of the short-circuit radiating section 130 is coupled to the second end 122 of the feed radiating section 120. In some embodiments, the short-circuit radiating section 130 includes a grounding branch 135 coupled to the grounding element 110, which is adjacent to the second end 132 of the short-circuit radiating section 130. It should be noted that the terms "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements that is less than a predetermined distance (e.g., 10 mm or less), or may include a situation where two corresponding elements are in direct contact with each other (i.e., the aforementioned distance is reduced to 0). Therefore, the feed radiating section 120 can be coupled to the grounding element 110 via the short-circuit radiating section 130.

[0071] The connecting radiating portion 140 may be generally rectangular. Specifically, the connecting radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the connecting radiating portion 140 is coupled to the second end 132 of the short-circuit radiating portion 130. In some embodiments, the connecting radiating portion 140 further includes an extension branch 145, which may be generally triangular.

[0072] The first radiating portion 150 may generally be a straight strip of uniform width. Specifically, the first radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the first radiating portion 150 is coupled to the second end 142 of the connecting radiating portion 140, and the second end 152 of the first radiating portion 150 is an open end. Therefore, the connecting radiating portion 140 can be coupled between the first radiating portion 150 and the short-circuited radiating portion 130. In some embodiments, the first radiating portion 150 may also be a straight strip of unequal width.

[0073] The second radiating portion 160 may generally be a straight strip of unequal width. Specifically, the second radiating portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the second radiating portion 160 is coupled to the second end 122 of the feed radiating portion 120, and the second end 162 of the second radiating portion 160 is an open-circuit end. For example, the second end 162 of the second radiating portion 160 and the second end 152 of the first radiating portion 150 may extend in generally the same direction. In some embodiments, the second radiating portion 160 includes a wider portion 164 adjacent to the first end 161 and a narrower portion 165 adjacent to the second end 162, wherein the narrower portion 165 is coupled to the feed radiating portion 120 via the wider portion 164.

[0074] A coupling slot region 170 is formed and is generally surrounded by the feed radiator 120, the short-circuit radiator 130, the connecting radiator 140, the first radiator 150, and the second radiator 160. For example, the coupling slot region 170 may be a straight slot with a closed end 171 and an open end 172.

[0075] In some embodiments, the antenna structure 100 further includes a dielectric substrate 180, wherein the grounding element 110, the feed radiating portion 120, the short-circuit radiating portion 130, the connection radiating portion 140, the first radiating portion 150, and the second radiating portion 160 can all be disposed on the same surface of the dielectric substrate 180. For example, the dielectric substrate 180 can be a flexible printed circuit (FPC) or a printed circuit board (PCB), but is not limited thereto.

[0076] In some embodiments, the antenna structure 100 may cover a first frequency band, a second frequency band, and a third frequency band. For example, the first frequency band may be between 2400MHz and 2500MHz, the second frequency band may be between 5150MHz and 5850MHz, and the third frequency band may be between 5875MHz and 7125MHz. Therefore, the antenna structure 100 will at least support broadband operation of traditional WLAN (Wireless Wide Area Network) 2.4GHz / 5GHz and next-generation Wi-Fi 6E.

[0077] In terms of operating principle, the feed radiator 120, short-circuit radiator 130, connecting radiator 140, and first radiator 150 can jointly generate the aforementioned first frequency band. The feed radiator 120, short-circuit radiator 130, and connecting radiator 140 can jointly generate the aforementioned second frequency band. The feed radiator 120 and second radiator 160 can jointly generate the aforementioned third frequency band. According to actual measurement results, the addition of the extension branch 145 of the connecting radiator 140 helps to increase the equivalent resonant length. In addition, the addition of the protruding branch 115 of the grounding element 110 can reduce the overall manufacturing complexity.

[0078] Figure 2 This displays a current distribution diagram of an antenna structure 100 according to an embodiment of the present invention. Figure 2 In this embodiment, when the antenna structure 100 is excited by the signal source 190, a first current I1 flows through the first radiating section 150, while a second current I2 flows through the second radiating section 160, the feed radiating section 120, and the short-circuit radiating section 130. It is important to note that the second current I2 and the first current I1 have approximately opposite directions. In some embodiments, the second current I2 may also flow through the connecting radiating section 140 before forming the first current I1. According to actual measurements, this current cancellation design associated with the coupling slot region 170 helps reduce a specific absorption rate (SAR) of the antenna structure 100 in the aforementioned first, second, and third frequency bands. It should be noted that since the grounding branch 135 is located between the feed point FP and the connecting radiating part 140, and the feed point FP is far away from the connecting radiating part 140, the equivalent resonant length of the antenna structure 100 can be increased, and the aforementioned reverse design of the first current I1 and the second current I2 can be further enhanced.

[0079] In some embodiments, the component dimensions of the antenna structure 100 may be as described below. The total length L1 of the feed radiator 120, the short-circuit radiator 130, the connecting radiator 140, and the first radiator 150 (which may be measured from the feed point FP and extend to the second end 152 of the first radiator 150) may be approximately equal to 0.25 times the wavelength (λ / 4) of the first frequency band of the antenna structure 100. The total length L2 of the feed radiator 120, the short-circuit radiator 130, and the connecting radiator 140 (which may be measured from the feed point FP and extend to one side 143 of the connecting radiator 140) may be approximately equal to 0.25 times the wavelength (λ / 4) of the second frequency band of the antenna structure 100. The total length L3 of the feed radiator 120 and the second radiator 160 (which can be measured from the feed point FP and extended to the second end 162 of the second radiator 160) is approximately equal to 0.25 times the wavelength (λ / 4) of the third frequency band of the antenna structure 100. The short-circuit radiator 130 has a width W1, and the first radiator 150 has a width W2, wherein the width ratio (W1 / W2) of the short-circuit radiator 130 and the first radiator 150 is between 0.5 and 1.5. The width WS of the coupling slot region 170 is between 0.15 mm and 3.5 mm. The distance D1 between the connecting radiator 140 and the grounding element 110 is between 1 mm and 3 mm. The above component size ranges are derived from multiple experimental results and help optimize the specific absorptivity (SAR), operating bandwidth, and impedance matching of the antenna structure 100.

[0080] Figure 3 This shows a top view of an antenna structure 300 according to another embodiment of the present invention. Figure 3 and Figure 1 Similar. Figure 3 In one embodiment, the antenna structure 300 includes: a grounding element 310, a feed radiator 320, a short-circuit radiator 330, a connecting radiator 340, a first radiator 350, a second radiator 360, and a dielectric substrate 380, wherein a coupling slot region 370 is formed in the antenna structure 300. It should be noted that the grounding element 310 may be approximately a complete rectangle (without any notches or protruding branches), the connecting radiator 340 may not include any extending branches, and the second radiator 360 may be approximately a straight strip of equal width. According to actual measurement results, this structural fine-tuning does not negatively affect the radiation performance of the antenna structure 300. Figure 3 The remaining features of the antenna structure 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.

[0081] This invention proposes a novel antenna structure. Compared to traditional designs, this invention offers advantages such as low specific absorption rate, small size, wide bandwidth, and low manufacturing cost, making it well-suited for use in a wide variety of mobile communication devices.

[0082] 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 to 3 The state illustrated. This invention may include only... Figures 1 to 3 Any one or more features of any one or more embodiments of the present invention. In other words, not all of the illustrated features need to be implemented simultaneously in the antenna structure of the present invention.

[0083] 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.

[0084] 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 should be able to 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 scope of the appended claims.

Claims

1. An antenna structure comprising: A grounding element; A feed radiator having a feed point; A short-circuit radiating section, wherein the feed radiating section is coupled to the grounding element via the short-circuit radiating section; One connecting radiating part; A first radiating part, wherein the connecting radiating part is coupled between the first radiating part and the short-circuited radiating part; as well as A second radiating section, the second radiating section being coupled to the feed radiating section; One of the coupling slot regions is formed and is surrounded by the feed radiation section, the short-circuit radiation section, the connection radiation section, the first radiation section, and the second radiation section; The coupling slot area is a straight strip-shaped slot.

2. 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.

3. The antenna structure of claim 2, wherein the coupling slot region is used to reduce a specific absorption rate of the antenna structure in the first frequency band, the second frequency band, and the third frequency band.

4. The antenna structure as claimed in claim 2, wherein the first frequency band is between 2400 MHz and 2500 MHz, the second frequency band is between 5150 MHz and 5850 MHz, and the third frequency band is between 5875 MHz and 7125 MHz.

5. The antenna structure as claimed in claim 1, wherein the grounding element further includes a protruding branch.

6. The antenna structure of claim 1, wherein the short-circuit radiating section includes a grounding branch coupled to the grounding element.

7. The antenna structure as claimed in claim 1, wherein the connecting radiating part further includes an extension branch.

8. The antenna structure of claim 7, wherein the extended branch forms a triangle.

9. The antenna structure as claimed in claim 1, wherein the second radiating portion is a straight strip of unequal width.

10. The antenna structure of claim 1, wherein the second radiating portion includes a wider portion and a narrower portion, and the narrower portion is coupled to the feed radiating portion via the wider portion.

11. The antenna structure as claimed in claim 1, wherein the second radiating portion and the first radiating portion extend in the same direction.

12. The antenna structure as claimed in claim 2, wherein the total length of the feed radiator, the short-circuit radiator, the connecting radiator, and the first radiator is equal to 0.25 times the wavelength of the first frequency band.

13. The antenna structure as claimed in claim 2, wherein the total length of the feed radiator, the short-circuit radiator, and the connecting radiator is equal to 0.25 times the wavelength of the second frequency band.

14. The antenna structure as claimed in claim 2, wherein the total length of the feed radiating section and the second radiating section is equal to 0.25 times the wavelength of the third frequency band.

15. The antenna structure as claimed in claim 1, wherein the width ratio of the short-circuit radiating portion to the first radiating portion is between 0.5 and 1.

5.

16. The antenna structure of claim 1, wherein the width of the coupling slot region is between 0.15 mm and 3.5 mm.

17. The antenna structure as claimed in claim 1, wherein a first current flows through the first radiating section, a second current flows through the second radiating section, the feed radiating section, and the short-circuit radiating section, and the second current and the first current have opposite directions.

18. The antenna structure as described in claim 1, further comprising: A dielectric substrate, wherein the feed radiation portion, the short-circuit radiation portion, the connection radiation portion, the first radiation portion, and the second radiation portion are all disposed on the dielectric substrate.

19. The antenna structure of claim 18, wherein the dielectric substrate is a flexible circuit board or a printed circuit board.

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