CN115603038A

CN115603038A - Antenna structure

Info

Publication number: CN115603038A
Application number: CN202110720688.0A
Authority: CN
Inventors: 魏仕强
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2023-01-13

Abstract

An antenna structure. The antenna structure comprises a grounding element, a first radiation part, a second radiation part, a third radiation part and a dielectric substrate; the first radiation part is provided with a feed point, wherein the first radiation part is coupled to a first grounding point on the grounding element; the second radiation part is coupled to the feed point; 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 grounding element, the first radiation part, the second radiation part and the third radiation part are all arranged on the dielectric substrate. Compared with the conventional design, the antenna structure of the present invention has at least the advantages of small size, wide frequency band, low profile, and low manufacturing cost, so that it is well suited for various mobile communication devices (especially narrow-frame devices).

Description

Antenna structure

Technical Field

The present invention relates to an antenna structure, and more particularly, to a Wideband (Wideband) antenna structure.

Background

With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as: portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. To meet the demand of people, mobile devices generally have a function of wireless communication. Some cover long-range wireless communication ranges, such as: the mobile phone uses 2G, 3G, LTE (Long Term Evolution) system and uses 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz frequency bands for communication, while some mobile phones cover short-distance wireless communication ranges, for example: wi-Fi systems use the 2.4, 5.2, and 5.8GHz frequency bands for communication.

An Antenna (Antenna) is an indispensable element in the field of wireless communication. If the Bandwidth (Bandwidth) of the antenna for receiving or transmitting signals is insufficient, the communication quality of the mobile device is easily degraded. Therefore, how to design a small-sized and wide-band antenna element is an important issue for an antenna designer.

Therefore, it is desirable to provide an antenna structure to solve the above problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, which includes: a grounding element; a first radiation part having a feed point, wherein the first radiation part is coupled to a first grounding point on the grounding element; a second radiation part coupled to the feed point; a third radiating portion coupled to a second ground point on the ground element, wherein the third radiating portion is adjacent to the second radiating portion; and a dielectric substrate, wherein the grounding element, the first radiation part, the second radiation part and the third radiation part are all arranged on the dielectric substrate.

In some embodiments, the antenna structure covers a low frequency band, a first high frequency band, a second high frequency band, and a third high frequency band.

In some embodiments, the first radiating portion has an inverted U-shape and at least partially surrounds a slot region.

In some embodiments, the second radiating portion has a straight strip shape.

In some embodiments, the third radiating portion has a T-shape.

In some embodiments, a coupling gap is formed between the third radiating portion and the second radiating portion.

In some embodiments, the antenna structure further comprises: a fourth radiation part, coupled to a first connection point on the first radiation part and disposed in the slot region, wherein the fourth radiation part is in an inverted T shape.

In some embodiments, the antenna structure further comprises: a fifth radiation part coupled to a second connection point on the first radiation part and disposed in the slot region, wherein the fifth radiation part has a rectangular shape.

In some embodiments, the length of the first radiating portion is substantially equal to 0.5 wavelengths of the low frequency band.

In some embodiments, a total length of the second radiation portion and the third radiation portion is substantially equal to 0.5 times a wavelength of the first high frequency band.

In some embodiments, the length of the second radiating portion is equal to 0.25 times the wavelength of the second high frequency band.

In some embodiments, the first radiating portion includes a first segment, a second segment, and a third segment, wherein the second radiating portion includes a fourth segment and a fifth segment, wherein the first segment and the fourth segment are both coupled to the feeding point, and the third segment is coupled to the first ground point.

In some embodiments, the dielectric substrate has a first surface and a second surface opposite to each other, wherein the grounding element, the first section, the third section, the fourth section, and the third radiating portion are disposed on the first surface of the dielectric substrate, and wherein the second section and the fifth section are disposed on the second surface of the dielectric substrate.

In some embodiments, the fourth segment is directly coupled to the first segment and the fifth segment is directly coupled to the second segment.

In some embodiments, a coupling gap is formed between the third section and the first section.

In some embodiments, the second segment has a first perpendicular projection on the first surface of the dielectric substrate, and the first perpendicular projection at least partially overlaps with both the first segment and the third segment.

In some embodiments, the fifth section has a second perpendicular projection on the first surface of the dielectric substrate, and the second perpendicular projection at least partially overlaps the fourth section.

In some embodiments, the fourth section is spaced from the third radiating portion by a distance greater than or equal to 3mm.

In some embodiments, the antenna structure further comprises: one or more conductive through-members penetrating the dielectric substrate and coupled between the third section and the second section.

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

Compared with the conventional design, the invention has the advantages of small size, wide frequency band, low posture, low manufacturing cost and the like, so the invention is very suitable for being applied to various mobile communication devices (particularly devices with narrow frames).

Drawings

Fig. 1 is a top view of an antenna structure according to an embodiment of the invention.

Fig. 2 is a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Fig. 3 shows a radiation efficiency diagram of an antenna structure according to an embodiment of the invention.

Fig. 4A is a top view of an antenna structure according to an embodiment of the invention.

Fig. 4B is a top view of a part of the elements of the antenna structure on the first surface of the dielectric substrate according to an embodiment of the invention.

Fig. 4C is a perspective view of another part of the elements of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the invention.

Fig. 4D is a cross-sectional view of an antenna structure according to an embodiment of the invention.

Fig. 5 is a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Fig. 6 shows a radiation efficiency diagram of an antenna structure according to an embodiment of the invention.

Fig. 7A is a top view of an antenna structure according to an embodiment of the invention.

Fig. 7B is a top view of a portion of the antenna structure on the first surface of the dielectric substrate according to an embodiment of the invention.

Fig. 7C is a perspective view of another part of the elements of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the invention.

Fig. 7D is a cross-sectional view of an antenna structure according to an embodiment of the invention.

Fig. 8 is a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Fig. 9 shows a radiation efficiency diagram of an antenna structure according to an embodiment of the invention.

Description of the main component symbols:

100. 400, 700 antenna structure

105. 405, 705 grounding element

106. System ground

110. 410, 710 first radiation part

111. First end of the first radiation part

112. Second end of the first radiation part

115. Slotted hole area

150. 450, 750 second radiation part

151. First end of the second radiation part

152. Second end of the second radiation part

160. A fourth radiation part

161. First end of the fourth radiation part

162. Second end of the fourth radiation part

163. Third end of the fourth radiation part

170. Fifth radiation part

171. First end of fifth radiation part

172. Second end of the fifth radiation part

180. 480, 780 third radiation part

181. First ends of the 481, 781 third radiating portions

182. 482, 782 a second end of the third radiating portion

183. Third end of the third radiation part

190. 490, 790 dielectric substrate

199. 499, 799 signal source

420. 720 first section

421. 721 first end of the first section

422. 722 a second end of the first section

423. Third end of the first section

430. 730 second section

431. 731 first end of second section

432. 732 second end of the second section

440. 740 third section

441. 741 first end of third section

442. 742 second end of the third section

445. Rectangular widening of the third section

460. 760 fourth segment

461. 761 first end of fourth segment

462. 762 second end of fourth section

470. 770 fifth section

471. 771 first end of fifth section

472. 772 second end of the fifth section

495. Conductive through-member

735. First rectangular widened portion of second section

745. Second rectangular widening of third section

746. Extension branch of third section

CP1 first connection point

CP2 second connection point

Distance between D1 and D2

E0 Surface of

E1, E3 first surface

E2, E4 second surface

FBL1, FBL2, FBL3 low frequency band

FBH1, FBH4, FBH7 first high frequency band

FBH2, FBH5, FBH8 second high frequency band

FBH3, FBH6, FBH9 third high frequency band

FP1, FP2, FP3 feed-in point

GC1, GC2, GC3 coupling gaps

GP1, GP3, GP5 first grounding point

GP2, GP4, GP6 second grounding point

Height H1, H2, H3

L1, L2, L3, L4, L5, L6, L7, L8 are of length

Line cross section of LC1 and LC2

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The scope of the present specification and claims does not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to achieve the basic technical result. In addition, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

The following disclosure provides many different embodiments, or examples, for implementing different features of the disclosure. The following disclosure describes specific examples of components and arrangements thereof to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the specification states a first feature formed over or on a second feature, that is, embodiments that may include the first feature in direct contact with the second feature, embodiments may include additional features formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the same reference signs or (and) signs may be repeated for different examples in the following description. These iterations are for simplicity and clarity and are not intended to limit the particular relationship between the various embodiments or (and) structures discussed.

Furthermore, spatially relative terms, such as "below …," "below," "lower," "above," "upper," and the like, are used for ease of describing the relationship of one element or feature to another element(s) or feature(s) in the figures. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be oriented in different orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 shows a top view of an antenna structure 100 according to an embodiment of the invention. The antenna structure 100 may be used in a Mobile Device (Mobile Device), such as: a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). In the embodiment of fig. 1, the antenna structure 100 at least includes a Ground Element (Ground Element) 105, a first Radiation portion (Radiation Element) 110, a second Radiation portion 150, a third Radiation portion 180, and a Dielectric Substrate (Dielectric Substrate) 190, wherein the Ground Element 105, the first Radiation portion 110, the second Radiation portion 150, and the third Radiation portion 180 are all made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof.

The dielectric substrate 190 may be a Printed Circuit Board (PCB). The grounding element 105, the first radiation portion 110, the second radiation portion 150, and the third radiation portion 180 may be disposed on the same surface E0 of the dielectric substrate 190. The grounding element 105 may be implemented by a Ground Copper Foil (Ground Copper Foil), which may extend beyond the dielectric substrate 190 and may be coupled to a System Ground (System Ground) 106.

The first radiating portion 110 may substantially have an inverted U-shape and may at least partially surround a Slot Region (Slot Region) 115. In detail, the first radiation portion 110 has a first end 111 and a second end 112, wherein a Feeding Point (FP 1) is located at the first end 111 of the first radiation portion 110, and the second end 112 of the first radiation portion 110 is coupled to a first ground Point GP1 on the ground element 105. The feed point FP1 may also be coupled to a Signal Source 199, such as: a Radio Frequency (RF) module may be used to excite the antenna structure 100. In some embodiments, the first radiating portion 110 is a non-uniform width structure to adjust Impedance Matching (Impedance Matching) of the antenna structure 100. In other embodiments, the first radiation portion 110 may be an equal-width structure.

The second radiation portion 150 may substantially have a straight bar shape. In detail, the second radiation portion 150 has a first End 151 and a second End 152, wherein the first End 151 of the second radiation portion 150 is coupled to the feed point FP1, and the second End 152 of the second radiation portion 150 is an Open End (Open End). In some embodiments, the second radiation portion 150 is a non-uniform width structure to adjust the impedance matching of the antenna structure 100. In other embodiments, the second radiation portion 150 may be an equal width structure.

The third radiating portion 180 may substantially have a T-shape. In detail, the third radiation portion 180 has a first end 181, a second end 182, and a third end 183, wherein the first end 181 of the third radiation portion 180 is coupled to a second ground point GP2 on the ground element 105, and the second end 182 and the third end 183 of the third radiation portion 180 are two open ends and extend in a direction away from each other. The second end 182 of the third radiating portion 180 is adjacent to the second end 152 of the second radiating portion 150. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements that is less than a predetermined distance (e.g., 5mm or less), but generally does not include the case where two corresponding elements are in direct contact with each other (i.e., the distance is reduced to 0). In some embodiments, a Coupling Gap (Coupling Gap) GC1 is formed between the second end 182 of the third radiating portion 180 and the second end 152 of the second radiating portion 150.

In some embodiments, the antenna structure 100 further includes a fourth radiation portion 160, which can be made of a metal material and is disposed on the surface E0 of the dielectric substrate 190. The fourth radiation portion 160 may substantially have an inverted T-shape and may be disposed in the slot region 115. In detail, the fourth radiation portion 160 has a first end 161, a second end 162, and a third end 163, wherein the first end 161 of the fourth radiation portion 160 is coupled to a first connection point CP1 on the first radiation portion 110, and the second end 162 and the third end 163 of the fourth radiation portion 160 are two open ends and extend in a direction away from each other.

In some embodiments, the antenna structure 100 further includes a fifth radiation portion 170, which can be made of a metal material and is disposed on the surface E0 of the dielectric substrate 190. The fifth radiating portion 170 may have a substantially rectangular shape and may be disposed within the slot region 115. In detail, the fifth radiation portion 170 has a first end 171 and a second end 172, wherein the first end 171 of the fifth radiation portion 170 is coupled to a second connection point CP2 on the first radiation portion 110, and the second end 172 of the fifth radiation portion 170 is an open end and is adjacent to the third end 163 of the fourth radiation portion 160. The second connection point CP2 is different from the first connection point CP1 and may be adjacent to the feed point FP1. It should be understood that both the fourth radiation portion 160 and the fifth radiation portion 170 are Optional elements (Optional components), and may be removed in other embodiments.

Fig. 2 is a Voltage Standing Wave Ratio (VSWR) diagram of the antenna structure 100 according to the embodiment of the invention, wherein the horizontal axis represents an operating frequency (MHz) and the vertical axis represents a VSWR. According to the measurement results of fig. 2, the antenna structure 100 can cover a low frequency band FBL1, a first high frequency band FBH1, a second high frequency band FBH2, and a third high frequency band FBH3 when excited by the signal source 199. For example, the low frequency band FBL1 may be between 2300MHz and 2600MHz, the first high frequency band FBH1 may be between 4300MHz and 5000MHz, the second high frequency band FBH2 may be between 5000MHz and 6800MHz, and the third high frequency band FBH3 may be between 6800MHz and 8000 MHz. Thus, the antenna structure 100 will at least support broadband operation of legacy WLAN (Wireless Wide Area Network) and new generation Wi-Fi 6E.

In some embodiments, the principles of operation of the antenna structure 100 may be as follows. The first radiation portion 110 can be excited to generate a Fundamental resonance Mode (Fundamental resonance Mode) to form the aforementioned low frequency band FBL1. The third radiation portion 180 may be coupled and excited by the second radiation portion 150 to form the aforementioned first high frequency band FBH1. The second radiation part 150 may be excited by itself to form the aforementioned second high frequency band FBH2. The first radiation portion 110 can also excite and generate a high-Order resonance Mode (high-Order resonance Mode) to form the aforementioned third high-frequency band FBH3. In addition, the fourth radiation portion 160 and the fifth radiation portion 170 can be used to fine tune the impedance matching of the antenna structure 100, so as to simultaneously increase the operating bandwidths (Operation bandwidths) of the low frequency band FBL1, the first high frequency band FBH1, the second high frequency band FBH2, and the third high frequency band FBH3.

Fig. 3 shows a Radiation Efficiency (Radiation Efficiency) diagram of the antenna structure 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the Radiation Efficiency (dB). According to the measurement results shown in fig. 3, the radiation efficiency of the antenna structure 100 in the low frequency band FBL1, the first high frequency band FBH1, the second high frequency band FBH2, and the third high frequency band FBH3 can reach-5 dBi or higher, which can meet the practical application requirements of WLAN and Wi-Fi 6E communication.

In some embodiments, the element dimensions of the antenna structure 100 may be as follows. The length L1 of the first radiation part 110 may be substantially equal to 0.5 times the wavelength (λ/2) of the low frequency band FBL1 of the antenna structure 100, or may be substantially equal to 1.5 times the wavelength (3 λ/2) of the third high frequency band FBH3 of the antenna structure 100. The sum (L2 + L3) of both the length L2 of the second radiation portion 150 and the length L3 of the third radiation portion 180 may be substantially equal to 0.5 times the wavelength (λ/2) of the first high-frequency band FBH1 of the antenna structure 100. The length L2 of the second radiation portion 150 may be substantially equal to 0.25 times the wavelength (λ/4) of the second high frequency band FBH2 of the antenna structure 100. The height H1 of the dielectric substrate 190 may be less than or equal to 4mm. The width of the coupling gap GC1 may be less than or equal to 3mm. The above size ranges are found from a number of experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 100.

The antenna structure 100 is well suited for Narrow bezel (Narrow Border) design due to its broadband, low profile characteristics. The following embodiments will describe other variations of the antenna structure 100, which may also perform similar functions. It must be understood that these drawings and descriptions are only exemplary and are not intended to limit the scope of the present invention.

Fig. 4A is a top view of an antenna structure 400 according to an embodiment of the invention. In the embodiment of fig. 4A, the antenna structure 400 includes: a grounding device 405, a first radiation portion 410, a second radiation portion 450, a third radiation portion 480, and a dielectric substrate 490, wherein the grounding device 405, the first radiation portion 410, the second radiation portion 450, and the third radiation portion 480 can be made of metal material. In detail, the first radiation portion 410 includes a first section (Segment) 420, a second section 430, and a third section 440, and the second radiation portion 450 includes a fourth section 460 and a fifth section 470, wherein the fourth section 460 is directly coupled to the first section 420, and the fifth section 470 is directly coupled to the second section 430.

The dielectric substrate 490 may be a printed circuit board. The dielectric substrate 490 has a first surface E1 and a second surface E2 opposite to each other, wherein the grounding element 405, the first section 420, the third section 440, the fourth section 460, and the third radiating portion 480 are disposed on the first surface E1 of the dielectric substrate 490, and the second section 430 and the fifth section 470 are disposed on the second surface E2 of the dielectric substrate 490. Fig. 4B is a top view of a part of the elements of the antenna structure 400 on the first surface E1 of the dielectric substrate 490 according to an embodiment of the invention. Fig. 4C shows a perspective view of another part of the elements of the antenna structure 400 on the second surface E2 of the dielectric substrate 490 according to an embodiment of the invention (i.e., the dielectric substrate 490 is regarded as a transparent element). Fig. 4D shows a cross-sectional view (along a section line LC1 in fig. 4A) of the antenna structure 400 according to an embodiment of the invention. Please refer to fig. 4A, fig. 4B, fig. 4C, and fig. 4D.

In the first radiation portion 410, the first section 420 may substantially present a smaller inverted U-shape. In detail, the first segment 420 has a first end 421, a second end 422, and a third end 423, wherein a feed point FP2 is located at the first end 421 of the first segment 420, and the second end 422 and the third end 423 of the first segment 420 are two open ends, which may extend in substantially the same direction. The feed point FP2 may also be coupled to a signal source 499 for exciting the antenna structure 400. The second section 430 may generally exhibit a non-uniform width bar shape. In detail, the second section 430 has a first end 431 and a second end 432, wherein the first end 431 of the second section 430 is substantially aligned with the feed point FP2, and the second end 432 of the second section 430 is an open end. The width of the first end 431 of the second section 430 is greater than the width of the second end 432 of the second section 430. In some embodiments, the second segment 430 has a first Vertical Projection (Vertical Projection) on the first surface E1 of the dielectric substrate 490, and the first Vertical Projection may at least partially overlap with both the first segment 420 and the third segment 440.

In the first radiation portion 410, the third segment 440 may substantially have a shape of a large inverted U. In detail, the third section 440 has a first end 441 and a second end 442, wherein the first end 441 of the third section 440 is coupled to a first grounding point GP3 on the grounding element 405, and the second end 442 of the third section 440 is an open end. For example, a coupling gap GC2 may be formed between the second end 442 of the third section 440 and the second end 422 of the first section 420. In some embodiments, the third section 440 also includes a rectangular widening 445 adjacent to its second end 442 to adjust the impedance matching of the antenna structure 400. In some embodiments, the antenna structure 400 further includes one or more Conductive Via elements (Conductive Via elements) 495 that may penetrate the dielectric substrate 490 and are coupled between the third section 440 and the second section 430.

In the second radiation portion 450, the fourth section 460 may substantially exhibit a straight bar shape of unequal width. In detail, the fourth section 460 has a first end 461 and a second end 462, wherein the first end 461 of the fourth section 460 is coupled to the feed point FP2, and the second end 462 of the fourth section 462 is an open end. The fifth section 470 may generally take the shape of an inverted L. In detail, the fifth section 470 has a first end 471 and a second end 472, wherein the first end 471 of the fifth section 470 is coupled to the first end 431 of the second section 430, and the second end 472 of the fifth section 470 is an open end. The second end 472 of the fifth section 470 and the second end 432 of the second section 430 may extend in generally opposite directions. In some embodiments, the fifth section 470 has a second perpendicular projection on the first surface E1 of the dielectric substrate 490, and the second perpendicular projection at least partially overlaps with the fourth section 460.

The third radiating portion 480 may substantially exhibit a loop shape. In detail, the third radiating portion 480 has a first end 481 and a second end 482, wherein the first end 481 of the third radiating portion 480 is coupled to a second ground point GP4 on the ground element 405, and the second end 482 of the third radiating portion 480 is an open end. In the present embodiment, the second end 482 of the third radiating portion 480 is adjacent to the second ground point GP4, but the invention is not limited thereto.

Fig. 5 shows a voltage standing wave ratio diagram of an antenna structure 400 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents voltage standing wave ratio. According to the measurement results of fig. 5, the antenna structure 400 may cover a low frequency band FBL2, a first high frequency band FBH4, a second high frequency band FBH5, and a third high frequency band FBH6 when excited by the signal 499. For example, the low band FBL2 may be between 2350MHz and 2700MHz, the first high band FBH4 may be between 4950MHz and 5350MHz, the second high band FBH5 may be between 5350MHz and 6100MHz, and the third high band FBH6 may be between 6100MHz and 8000 MHz. Thus, the antenna structure 400 will support at least the broadband operation of legacy WLANs and new generation Wi-Fi 6E.

In some embodiments, the principles of operation of the antenna structure 400 may be as follows. The first section 420, the second section 430 and the third section 440 of the first radiating portion 410 can be excited together to generate a fundamental resonance mode, so as to form the aforementioned low frequency band FBL2. The second section 430 and the third radiating part 480 of the first radiating part 410 may be excited together to form the aforementioned first high frequency band FBH4. The fourth section 460 and the fifth section 470 of the second radiation part 450 may be excited together to form the aforementioned second high frequency band FBH5. The first section 420, the second section 430 and the third section 440 of the first radiation portion 410 can also jointly excite a high-order resonance mode to form the aforementioned third high-frequency band FBH6. According to the actual measurement result, even if the first radiation portion 410 and the second radiation portion 450 are discontinuous structures and are distributed on the first surface E1 and the second surface E2 of the dielectric substrate 490, they do not affect the radiation performance of the antenna structure 400.

Fig. 6 shows a radiation efficiency diagram of an antenna structure 400 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents radiation efficiency (dB). According to the measurement results shown in fig. 6, the radiation efficiency of the antenna structure 400 in the low frequency band FBL2, the first high frequency band FBH4, the second high frequency band FBH5, and the third high frequency band FBH6 can reach-5 dBi or higher, which can meet the practical application requirements of WLAN and Wi-Fi 6E communication.

In some embodiments, the element dimensions of the antenna structure 400 may be as follows. The length L4 of the second section 430 may be approximately equal to 0.25 times the wavelength (λ/4) of the first high frequency band FBH4 of the antenna structure 400. The length L5 of the third radiation portion 480 may be substantially equal to 0.25 times the wavelength (λ/4) of the first high frequency band FBH4 of the antenna structure 400. The length L6 of the fourth section 460 may be substantially equal to 0.25 times the wavelength (λ/4) of the second high frequency band FBH5 of the antenna structure 400. The height H2 of the dielectric substrate 490 may be less than or equal to 4mm. The distance D1 between the fourth section 460 and the third radiating portion 480 may be greater than or equal to 3mm. The above size ranges are found from a number of experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 400. The remaining features of the antenna structure 400 of fig. 4A, 4B, 4C, and 4D are similar to the antenna structure 100 of fig. 1, so that similar operation effects can be achieved in both embodiments.

Fig. 7A is a top view of an antenna structure 700 according to an embodiment of the invention. In the embodiment of fig. 7A, the antenna structure 700 includes: a grounding element 705, a first radiation portion 710, a second radiation portion 750, a third radiation portion 780, and a dielectric substrate 790, wherein the grounding element 705, the first radiation portion 710, the second radiation portion 750, and the third radiation portion 780 are all made of metal material. In detail, the first radiating portion 710 includes a first section 720, a second section 730, and a third section 740, and the second radiating portion 750 includes a fourth section 760 and a fifth section 770, wherein the fourth section 760 is directly coupled to the first section 720 and the fifth section 770 is directly coupled to the second section 730.

The dielectric substrate 790 may be a Flexible Printed Circuit (FPC) having a relatively small thickness (e.g., only about 0.1 mm). The dielectric substrate 790 has a first surface E3 and a second surface E4 opposite to each other, wherein the ground element 705, the first section 720, the third section 740, the fourth section 760 and the third radiating portion 780 are disposed on the first surface E3 of the dielectric substrate 790, and the second section 730 and the fifth section 770 are disposed on the second surface E4 of the dielectric substrate 790. Fig. 7B is a top view of a portion of the antenna structure 700 on the first surface E3 of the dielectric substrate 790 according to an embodiment of the invention. Fig. 7C shows a perspective view of another part of the antenna structure 700 on the second surface E4 of the dielectric substrate 790 according to an embodiment of the invention (i.e., the dielectric substrate 790 is regarded as a transparent element). Fig. 7D shows a cross-sectional view (along a section line LC2 in fig. 7A) of the antenna structure 700 according to an embodiment of the invention. Please refer to fig. 7A, fig. 7B, fig. 7C, and fig. 7D.

In the first radiating portion 710, the first section 720 may substantially have an inverted C-shape. In detail, the first section 720 has a first end 721 and a second end 722, wherein a feed point FP3 is located at the first end 721 of the first section 720, and the second end 722 of the first section 720 is an open end, which can extend toward the ground element 705. The feed point FP3 may also be coupled to a signal source 799 to excite the antenna structure 700. The second section 730 may generally exhibit a non-uniform width bar shape. In detail, the second section 730 has a first end 731 and a second end 732, wherein the first end 731 of the second section 730 is substantially aligned with the feeding point FP3, and the second end 732 of the second section 730 is an open end. In addition, the second section 730 may further include a first rectangular widened portion 735. In some embodiments, the second section 730 has a first perpendicular projection on the first surface E3 of the media substrate 790, and the first perpendicular projection may at least partially overlap with both the first section 720 and the third section 740.

In the first radiating portion 710, the third segment 740 may substantially have a larger inverted U-shape. In detail, the third section 740 has a first end 741 and a second end 742, wherein the first end 741 of the third section 740 is coupled to a first grounding point GP5 on the grounding element 705, and the second end 742 of the third section 740 is an open end. For example, a coupling gap GC3 may be formed between the second end 742 of the third section 740 and the second end 722 of the first section 720. In some embodiments, the third section 740 further includes a second rectangular widening 745 and an extension 746 to adjust the impedance matching of the antenna structure 700.

In the second radiation portion 750, the fourth section 760 may substantially exhibit a non-uniform width straight bar shape. In detail, the fourth segment 760 has a first end 761 and a second end 762, wherein the first end 761 of the fourth segment 760 is coupled to the feed point FP3, and the second end 762 of the fourth segment 760 is an open end and can extend toward the third radiation portion 780. The fifth section 770 may generally take the shape of an inverted L. In detail, the fifth section 770 has a first end 771 and a second end 772, wherein the first end 771 of the fifth section 770 is coupled to the first end 731 of the second section 730, and the second end 772 of the fifth section 770 is an open end. The second end 772 of the fifth section 770 and the second end 732 of the second section 730 may extend in generally opposite directions. In some embodiments, the fifth section 770 has a second perpendicular projection on the first surface E3 of the media substrate 790, and the second perpendicular projection at least partially overlaps the fourth section 760.

The third radiating portion 780 may substantially exhibit a loop shape. In detail, the third radiating portion 780 has a first end 781 and a second end 782, wherein the first end 781 of the third radiating portion 780 is coupled to a second ground point GP6 on the ground element 705, and the second end 782 of the third radiating portion 780 is an open end. In the embodiment, the second end 782 of the third radiation portion 780 is adjacent to the second ground point GP6, but the invention is not limited thereto.

Fig. 8 is a graph of vswr of an antenna structure 700 according to an embodiment of the invention, where the horizontal axis represents operating frequency (MHz) and the vertical axis represents vswr. According to the measurement results of fig. 8, the antenna structure 700 covers a low frequency band FBL3, a first high frequency band FBH7, a second high frequency band FBH8, and a third high frequency band FBH9 when excited by the signal 799. For example, the low frequency band FBL3 may be between 2300MHz and 2600MHz, the first high frequency band FBH7 may be between 4950MHz and 6000MHz, the second high frequency band FBH8 may be between 6000MHz and 7500MHz, and the third high frequency band FBH9 may be between 7500MHz and 8000 MHz. Thus, the antenna structure 700 will at least support broadband operation of legacy WLANs and new generation Wi-Fi 6E.

In some embodiments, the principles of operation of the antenna structure 700 may be as follows. The first section 720, the second section 730, and the third section 740 of the first radiating portion 710 can be excited together to generate a fundamental resonance mode, so as to form the aforementioned low frequency band FBL3. The fourth and

fifth sections

760 and 770 of the second radiating part 750 and the third radiating part 780 may be excited together to form the aforementioned first high frequency band FBH7. The first section 720, the second section 730, and the third section 740 of the first radiating portion 710 can also jointly excite a high-order resonance mode to form the aforementioned second high-frequency band FBH8. The second section 730 of the first radiating portion 710 and the fourth and

fifth sections

760 and 770 of the second radiating portion 750 may be excited together to form the aforementioned third high frequency band FBH9. According to the actual measurement result, even if the first radiation portion 710 and the second radiation portion 750 are discontinuous structures and are distributed on the first surface E3 and the second surface E4 of the dielectric substrate 790, they do not affect the radiation performance of the antenna structure 700.

Fig. 9 shows a radiation efficiency graph of an antenna structure 700 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents radiation efficiency (dB). According to the measurement results shown in fig. 9, the radiation efficiency of the antenna structure 700 in the low frequency band FBL3, the first high frequency band FBH7, the second high frequency band FBH8 and the third high frequency band FBH9 can reach-5 dBi or higher, which can meet the practical application requirements of WLAN and Wi-Fi 6E communication.

In some embodiments, the element dimensions of the antenna structure 700 may be as follows. The length L7 of the fourth section 760 may be substantially equal to 0.25 times the wavelength (λ/4) of the first high frequency band FBH7 of the antenna structure 700. The length L8 of the third radiation portion 780 may be substantially equal to 0.25 times the wavelength (λ/4) of the first high frequency band FBH7 of the antenna structure 700. The height H3 of the media substrate 790 may be less than or equal to 4mm. The distance D2 between the fourth section 760 and the third radiating portion 780 may be greater than or equal to 3mm. The above size ranges are found from a number of experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 400. The remaining features of the antenna structure 700 of fig. 7A, 7B, 7C, and 7D are similar to the antenna structure 100 of fig. 1, so that similar operation effects can be achieved in both embodiments.

The present invention provides a novel antenna structure. Compared with the conventional design, the invention has the advantages of small size, wide frequency band, low posture, low manufacturing cost and the like, so the invention is very suitable for being applied to various mobile communication devices (particularly devices with narrow frames).

It is noted that the sizes, shapes and frequency ranges of the above-mentioned components are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the states illustrated in fig. 1-9. The present invention may include only any one or more features of any one or more of the embodiments of figures 1-9. In other words, not all illustrated features may be implemented in the antenna structure of the present invention at the same time.

Ordinal numbers such as "first," "second," "third," etc., in the present specification and in the claims are not used sequentially to indicate that two different elements having the same name are different.

The present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. An antenna structure, comprising:

a grounding element;

a first radiation part having a feed point, wherein the first radiation part is coupled to a first grounding point on the grounding element;

a second radiation part coupled to the feed point;

a third radiating portion coupled to a second ground point on the ground element, wherein the third radiating portion is adjacent to the second radiating portion; and

a dielectric substrate, wherein the grounding element, the first radiation portion, the second radiation portion and the third radiation portion are all disposed on the dielectric substrate.

2. The antenna structure of claim 1 wherein the antenna structure covers a low frequency band, a first high frequency band, a second high frequency band, and a third high frequency band.

3. The antenna structure of claim 1, wherein the first radiating portion has an inverted U-shape and at least partially surrounds a slot area.

4. The antenna structure according to claim 1, wherein the second radiating portion has a straight strip shape.

5. The antenna structure of claim 1, wherein the third radiating portion has a T-shape.

6. The antenna structure of claim 1, wherein a coupling gap is formed between the third radiating portion and the second radiating portion.

7. The antenna structure of claim 3, further comprising:

a fourth radiation part, coupled to a first connection point on the first radiation part and disposed in the slot region, wherein the fourth radiation part is in an inverted T shape.

8. The antenna structure of claim 7, further comprising:

a fifth radiation part, coupled to a second connection point on the first radiation part, and disposed in the slot region, wherein the fifth radiation part has a rectangular shape.

9. The antenna structure of claim 2, wherein the length of the first radiating portion is substantially equal to 0.5 wavelength of the low frequency band.

10. The antenna structure according to claim 2, wherein a total length of the second radiation portion and the third radiation portion is substantially equal to 0.5 times a wavelength of the first high frequency band.

11. The antenna structure according to claim 2, wherein the length of the second radiation section is equal to 0.25 times the wavelength of the second high frequency band.

12. The antenna structure of claim 1, wherein the first radiating portion comprises a first segment, a second segment, and a third segment, wherein the second radiating portion comprises a fourth segment and a fifth segment, wherein the first segment and the fourth segment are both coupled to the feed point, and the third segment is coupled to the first ground point.

13. The antenna structure according to claim 12, wherein the dielectric substrate has a first surface and a second surface opposite to each other, wherein the ground element, the first segment, the third segment, the fourth segment, and the third radiating portion are disposed on the first surface of the dielectric substrate, and wherein the second segment and the fifth segment are disposed on the second surface of the dielectric substrate.

14. The antenna structure of claim 12, wherein the fourth segment is directly coupled to the first segment and the fifth segment is directly coupled to the second segment.

15. The antenna structure of claim 12 wherein a coupling gap is formed between the third segment and the first segment.

16. The antenna structure of claim 12, wherein the second segment has a first vertical projection on the first surface of the dielectric substrate, and the first vertical projection at least partially overlaps with both the first segment and the third segment.

17. The antenna structure of claim 12, wherein the fifth segment has a second orthogonal projection on the first surface of the dielectric substrate, and the second orthogonal projection at least partially overlaps the fourth segment.

18. The antenna structure of claim 12, wherein the fourth segment is spaced from the third radiating portion by a distance greater than or equal to 3mm.

19. The antenna structure of claim 12, further comprising:

one or more conductive through-members penetrating the dielectric substrate and coupled between the third section and the second section.

20. The antenna structure of claim 1, wherein the dielectric substrate is a printed circuit board or a flexible circuit board.