CN113300095B

CN113300095B - Antenna structure

Info

Publication number: CN113300095B
Application number: CN202010108557.2A
Authority: CN
Inventors: 吴子民; 赖国仁; 古光原
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2020-02-21
Filing date: 2020-02-21
Publication date: 2024-01-30
Anticipated expiration: 2040-02-21
Also published as: CN113300095A

Abstract

An antenna structure. The antenna structure includes: a substrate, a feed-in radiation part, a first grounding radiation part, a second grounding radiation part and a first circuit element; the substrate is provided with a first surface and a second surface which are opposite; the feed-in radiation part comprises a body part, a bridging part and an extension part, wherein the body part is provided with a feed-in point, and the bridging part is coupled between the body part and the extension part; the first grounding radiation part is coupled to a grounding potential; the first circuit element is coupled between the first grounding radiation part and the second grounding radiation part; the bridging portion of the feed-in radiation part is arranged on the first surface of the substrate, and the first circuit element is arranged on the second surface of the substrate. The invention has the advantages of small size, wide frequency band, low manufacturing cost and the like, so that the invention is very suitable for being applied to various mobile communication devices.

Description

Antenna structure

Technical Field

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

Background

With the development of mobile communication technology, mobile devices are becoming increasingly popular in recent years, and common examples are: portable computers, mobile phones, multimedia players, and other portable electronic devices with hybrid functions. To meet the needs of people, mobile devices often have wireless communication capabilities. Some cover long range wireless communication ranges, such as: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz for communication, while some cover short range wireless communication ranges, such as: wi-Fi, bluetooth systems use the frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz for communication.

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

Accordingly, there is a need to provide an antenna structure to solve the above-mentioned problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, comprising: a substrate having a first surface and a second surface opposite to each other; the feed-in radiation part comprises a body part, a bridging part and an extension part, wherein the body part is provided with a feed-in point, and the bridging part is coupled between the body part and the extension part; a first grounding radiation part coupled to a ground potential; a second grounding radiation part; and a first circuit element coupled between the first ground radiating portion and the second ground radiating portion; the bridge portion of the feed-in radiation portion is disposed on the first surface of the substrate, and the first circuit element is disposed on the second surface of the substrate.

In some embodiments, the antenna structure covers an ultra wideband, and the ultra wideband includes at least a first frequency range between 699MHz and 960MHz, and a second frequency range between 1710MHz and 2690 MHz.

In some embodiments, the body portion of the feed-in radiation portion has an L-shape.

In some embodiments, the length of the body portion of the feeding radiation portion is less than or equal to 0.25 times the wavelength of the second frequency interval.

In some embodiments, the bridge portion of the feed-in radiation portion has a triangle, a T-shape, or a rectangle.

In some embodiments, the extension portion of the feed-in radiation portion has a meandering shape or an elongated square shape and is the smallest width of the feed-in radiation portion.

In some embodiments, the total length of the bridge portion and the extension portion of the feeding radiation portion is less than or equal to 0.25 times the wavelength of the first frequency interval.

In some embodiments, the first grounding radiation portion has a long straight strip shape and further includes a first protruding portion, and the first protruding portion has a trapezoid shape or a straight strip shape.

In some embodiments, the second grounding radiation portion has a shorter straight strip shape and further includes a second protruding portion, and the second protruding portion has an inverted trapezoid shape or a straight strip shape.

In some embodiments, the length of the second ground radiating portion is less than or equal to 0.25 times the wavelength of the first frequency interval.

In some embodiments, the first circuit element is an inductor, and the inductance value of the inductor is greater than or equal to 1nH.

In some embodiments, the bridge portion of the feed-in radiation portion has a vertical projection on the second surface of the substrate, and the vertical projection overlaps at least one of the first protruding portion or the second protruding portion.

In some embodiments, the antenna structure further comprises: and a second circuit element coupled between the second grounding radiation portion and the extension portion of the feed-in radiation portion.

In some embodiments, the second circuit element is a capacitor, and a capacitance value of the capacitor is greater than or equal to 0.1pF.

In some embodiments, the antenna structure further comprises: a first additional radiation part arranged on the second surface of the substrate; and one or more first conductive through elements penetrating the substrate, wherein the extension portion of the feed-in radiating portion is coupled to the second circuit element via the first conductive through elements and the first additional radiating portion.

In some embodiments, the antenna structure further comprises: a second additional radiation part arranged on the first surface of the substrate; and one or more second conductive through-elements penetrating the substrate, wherein the second ground radiating portion is coupled to the second circuit element via the second conductive through-elements and the second additional radiating portion.

In some embodiments, the antenna structure further comprises: and a parasitic radiating portion coupled to the first grounding radiating portion, wherein the parasitic radiating portion is adjacent to the extension portion of the feeding radiating portion but separated from the extension portion of the feeding radiating portion.

In some embodiments, the length of the parasitic radiating portion is less than or equal to 0.25 times the wavelength of the second frequency interval.

In some embodiments, the second grounding radiation portion is disposed on the second surface of the substrate or partially disposed on a plane substantially perpendicular to the first surface of the substrate.

In some embodiments, the antenna structure further comprises an adjusting circuit, which comprises: a plurality of impedance elements; and a switching element for selecting one of the impedance elements according to a control signal so that the first circuit element is coupled to the first ground radiating portion via the selected impedance element.

Compared with the traditional design, the invention has the advantages of at least small size, wide frequency band, low manufacturing cost and the like, so that the invention is very suitable for being applied to various mobile communication devices.

Drawings

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

Fig. 1B shows a top view of a portion of elements of an antenna structure on a first surface of a substrate according to an embodiment of the invention.

Fig. 1C shows a perspective view of another part of the elements of the antenna structure on the second surface of the substrate according to an embodiment of the invention.

Fig. 1D shows a side view of an antenna structure according to an embodiment of the invention.

Fig. 2 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 3 shows a top view of an antenna structure according to an embodiment of the invention.

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

Fig. 5 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 6A shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 6B shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 6C shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 6D shows a top view of an antenna structure according to an embodiment of the invention.

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

Fig. 7B is a schematic diagram of an adjusting circuit according to an embodiment of the invention.

Fig. 8 is a perspective view of an antenna structure according to an embodiment of the invention.

Fig. 9 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 10 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 11 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 12 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 13 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 14 shows a top view of an antenna structure according to an embodiment of the invention.

Description of main reference numerals:

100、200、300、400、500、601、

602、603、604、700、800、900、

1000. 1100, 1200, 1300, 1400 antenna structure

110. Substrate board

120. 820, 920, 1020 feed into the radiating element

130. 830 feed into the body portion of the radiating element

131. First end of body part of feed-in radiation part

132. A second end of the body part fed into the radiation part

140. 940, 1040 feed into the bridging portion of the radiating element

141. First end of bridging portion of feed-in radiation part

142. Second end of bridging portion of feed-in radiation part

150. 950, 1050 feed into the extension of the radiating portion

151. First end of extension part of feed-in radiation part

152. Second end of extension part of feed-in radiation part

160. 1160, 1260, 1360, 1460 first ground radiating portion

165. First protruding portions of first ground radiating portions 1265, 1165, 1465

170. 870, 1270, 1370, 1470 second ground radiating portion

175. Second protruding portions of 1275 and 1375 second ground radiating portions

181. First circuit element

182. Second circuit element

310. Parasitic radiation part

311. First end of parasitic radiating part

312. Second end of parasitic radiation part

420. A first additional radiation part

424. First conductive through element

530. Second additional radiation part

534. Second conductive through element

790. Adjusting circuit

791. 792, 793, 794 impedance elements

795. Switching element

1134. Third conductive through element

E1 A first surface of the substrate

E2 A first surface of the substrate

FP feed point

GC1 coupling gap

H1 Thickness of (L)

Length of L1, L2, L3, L4

SC control signal

VSS ground potential

Width of W1, W2, W3, W4

Detailed Description

The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments of the invention.

Certain terms are used throughout the description and claims to refer to particular components. Those of ordinary skill in the art will appreciate that a hardware manufacturer may refer to the same element by different names. The description and claims do not take the form of an element differentiated by name, but rather by functional differences. 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 that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, and achieve the basic technical effect. In addition, the term "coupled" as used herein includes any direct or indirect electrical connection. Accordingly, 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.

Fig. 1A shows a top view of an antenna structure (Antenna Structure) 100 according to an embodiment of the invention. The antenna structure 100 may be applied to a Mobile Device (Mobile Device), for example: a Smart Phone, a Tablet Computer, or a notebook Computer (Notebook Computer). As shown in fig. 1A, the antenna structure 100 includes at least: a Substrate (Substrate) 110, a feed-in radiating Portion (Feeding Radiation Element) 120, a first grounding radiating Portion (Grounding Radiation Element) 160, a second grounding radiating Portion 170, and a first Circuit Element (Circuit Element) 181, wherein the feed-in radiating Portion 120 comprises a Body Portion (Body Portion) 130, a Bridging Portion (Bridging Portion) 140, and an extension Portion (Extension Portion) 150. The feed-in radiation portion 120, the first grounding radiation portion 160, and the second grounding radiation portion 170 may be made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof.

The substrate 110 may be an FR4 (frame reflector 4) substrate, a laser direct structuring (Laser Direct Structuring, LDS) plastic, or a flexible Polyimide (PI) substrate. The substrate 110 has a first surface E1 and a second surface E2 opposite to each other, wherein the feed-in radiation portion 120 is disposed on the first surface E1 of the substrate 110, and the first ground radiation portion 160 is disposed on the substrate 110. Fig. 1B shows a top view of a portion of the elements of the antenna structure 100 on the first surface E1 of the substrate 110 according to an embodiment of the invention. Fig. 1C shows a perspective view of another part of the element of the antenna structure 100 on the second surface E2 of the substrate 110 according to an embodiment of the invention (i.e. the substrate 110 is regarded as a transparent element). Fig. 1D shows a side view of an antenna structure 100 according to an embodiment of the invention. Please refer to fig. 1A, fig. 1B, fig. 1C, fig. 1D together to understand the present invention.

The body portion 130 of the feeding radiation portion 120 may have a substantially L-shape. In detail, the body portion 130 has a first End 131 and a second End 132, wherein a Feeding Point FP is located at the first End 131 of the body portion 130, and the second End 132 of the body portion 130 is an Open End (Open End). The feed point FP may also be coupled to a Signal Source (not shown), such as: a Radio Frequency (RF) module may be used to excite the antenna structure 100.

The bridge portion 140 of the feeding radiation portion 120 may substantially take a triangle shape. In detail, the bridge portion 140 has a first end 141 and a second end 142, wherein a width W2 of the first end 141 of the bridge portion 140 is greater than or equal to a width W3 of the second end 142 of the bridge portion 140. In addition, the first end 141 of the bridge portion 140 is coupled to the body portion 130 and is adjacent to the feed-in point FP. It should be noted that the term "adjacent" or "adjacent" in the present specification may refer to the corresponding elements having a distance smaller than a predetermined distance (e.g., 5mm or less), and may also include the case where the corresponding elements are in direct contact with each other (i.e., the distance is reduced to 0).

The extension portion 150 of the feeding radiation portion 120 may substantially take a serpentine Shape (Meandering Shape), and belongs to the smallest width of the feeding radiation portion 120. In other words, the width W4 of the extension portion 150 is smaller than the width W1 of the body portion 130 and is also smaller than or equal to the widths W2, W3 of the bridge portion 140. In detail, the extension portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the extension portion 150 is coupled to the second end 142 of the bridge portion 140, and the second end 152 of the extension portion 150 is an open end and extends in a direction substantially opposite to and away from the second end 132 of the body portion 130. That is, the bridge portion 140 is coupled between the body portion 130 and the extension portion 150.

The first Ground radiating portion 160 is coupled to a Ground Voltage (VSS) and includes a first protruding portion (Protruding Portion) 165. The ground potential VSS may be provided by a system ground plane (System Ground Plane) of the antenna structure 100 (not shown). The first ground radiating portion 160 may substantially take the shape of a longer straight bar, and the first protruding portion 165 thereof may substantially take the shape of a trapezoid. In some embodiments, the first grounding radiation portion 160 is a grounding copper foil (Ground Copper Foil) that can extend onto the first surface E1 or the second surface E2 of the substrate 110. However, the present invention is not limited thereto. In other embodiments, the antenna structure 100 may further include an auxiliary ground portion (Auxiliary Grounding Element) (not shown) that may extend onto the first surface E1 of the substrate 110 and be coupled to both the first ground radiating portion 160.

The second ground radiating portion 170 includes a second protruding portion 175 extending in a direction approaching the first protruding portion 165. The second ground radiating portion 170 may substantially take the shape of a short straight bar, and the second protruding portion 175 thereof may substantially take the shape of an inverted trapezoid. Both the first protrusion 165 and the second protrusion 175 may together form a bow Structure (Bowtie Structure) or a symmetrical Structure. In some embodiments, the second ground radiating portion 170 is disposed on the second surface E2 of the substrate 110. However, the present invention is not limited thereto. In other embodiments, the second grounding radiation portion 170 may also be disposed on other planes than the first surface E1 or the second surface E2 of the substrate 110. The bridge portion 140 of the feeding radiation portion 120 has a perpendicular projection (Vertical Projection) on the second surface E2 of the substrate 110, and the perpendicular projection may overlap at least one of the first protruding portion 165 or the second protruding portion 175 of the first grounding radiation portion 160. The first circuit element 181 is coupled between the first protrusion 165 and the second protrusion 175. For example, the first circuit element 181 may be an Inductor (Inductor), and in other embodiments, the first circuit element 181 may be a Capacitor (Capacitor). It should be noted that the first protruding portion 165 and the second protruding portion 175 are optional elements, and may be removed from the antenna structure 100. In other embodiments, the first ground radiating portion 160 does not include the first protruding portion 165, and the second ground radiating portion 170 does not include the second protruding portion 175, such that the first circuit element 181 may be directly coupled between the first ground radiating portion 160 and the second ground radiating portion 170.

According to the actual measurement result, the antenna structure 100 may cover an Ultra-Wideband (UWB) band between 698MHz and 6000 MHz. In detail, the ultra-wideband includes at least a first frequency range (Frequency Interval) between 699MHz and 960MHz, and a second frequency range between 1710MHz and 2690 MHz. In terms of antenna principle, the body portion 130 of the feed-in radiating portion 120 may correspond to a second frequency interval of the antenna structure 100, and both the second ground radiating portion 170 and the extension portion 150 of the feed-in radiating portion 120 may correspond to a first frequency interval of the antenna structure 100. The first circuit element 181 may be used to fine tune the impedance matching of the first frequency interval (Impedance Matching) to increase the operating bandwidth of the first frequency interval (Operation Bandwidth). In addition, the tapered (Taper) design of the bridge portion 140, the first protruding portion 165, and the second protruding portion 175 can be used to improve impedance matching in a second frequency range between 1710MHz and 2690 MHz.

In some embodiments, the element dimensions and element parameters of the antenna structure 100 may be as follows. The thickness H1 of the substrate 110 may be between 0.02mm and 1.6 mm. The length L1 of the body portion 130 fed to the radiating portion 120 may be less than or equal to 0.25 times the wavelength (λ/4) of the second frequency interval of the antenna structure 100. The total length L2 of the bridge portion 140 and the extension portion 150 fed to the radiating portion 120 may be less than or equal to 0.25 times the wavelength (λ/4) of the first frequency interval of the antenna structure 100. The length L3 of the second ground radiating portion 170 may be less than or equal to 0.25 times wavelength (λ/4) of the first frequency interval of the antenna structure 100. The Inductance (Inductance) of the first circuit element 181 may be greater than or equal to 1nH. In the feeding radiation portion 120, the width W1 of the body portion 130 may be less than or equal to 4mm, the width W2 of the first end 141 of the bridge portion 140 may be less than or equal to 3mm, the width W3 of the second end 142 of the bridge portion 140 may be less than or equal to 2mm, and the width W4 of the extension portion 150 may be less than or equal to 2mm. The upper size range is found from a number of experimental results, which helps to optimize the operational bandwidth and impedance matching of the antenna structure 100.

Fig. 2 shows a top view of an antenna structure 200 according to an embodiment of the invention. Fig. 2 is similar to fig. 1A. In the embodiment of fig. 2, the antenna structure 200 further includes a second circuit element 182. The second circuit element 182 may be disposed on the first surface E1 of the substrate 110 and coupled between the second grounding radiation portion 170 and the extension portion 150 of the feeding radiation portion 120. In detail, the second circuit element 182 has a first end and a second end, wherein the first end of the second circuit element 182 is coupled to the second end 152 of the extension portion 150, and the second end of the second circuit element 182 is coupled to the second ground radiating portion 170 via a conductive through element (Conductive Via Element) (not shown). For example, the second circuit element 182 may be a capacitor, and the capacitance value thereof may be greater than or equal to 0.1pF. Based on the actual measurement result, the second circuit element 182 can be used to fine tune the impedance matching of the second frequency region (e.g., between 1710MHz and 2690 MHz) of the antenna structure 200, so as to increase the operation bandwidth of the second frequency region. In other embodiments, the second circuit element 182 may be changed to an inductor. The remaining features of the antenna structure 200 of fig. 2 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 3 shows a top view of an antenna structure 300 according to an embodiment of the invention. Fig. 3 is similar to fig. 1A. In the embodiment of fig. 3, the antenna structure 300 further includes a parasitic radiating portion (Parasitic Radiation Element) 310, which may be made of a metal material and may be disposed on the first surface E1 of the substrate 110. The parasitic radiating portion 310 may generally take on an L-shape. In detail, the parasitic radiator 310 has a first end 311 and a second end 312, wherein the first end 311 of the parasitic radiator 310 can be coupled to the first ground radiator 160 via a conductive through element (not shown), and the second end 312 of the parasitic radiator 310 is an open end. The second end 312 of the parasitic radiating portion 310 is adjacent to the extension portion 150 of the feeding radiating portion 120, but is separated from the extension portion 150 of the feeding radiating portion 120, such that a Coupling Gap (GC 1) may be formed between the parasitic radiating portion 310 and the extension portion 150 of the feeding radiating portion 120, and the width thereof may be less than 2mm. According to the actual measurement result, the parasitic radiator 310 may be used to fine tune the impedance matching of the second frequency region (e.g., between 1710MHz and 2690 MHz) of the antenna structure 300, so as to increase the operation bandwidth of the second frequency region. The length L4 of the parasitic radiating portion 310 may be less than or equal to 0.25 times the wavelength (λ/4) of the second frequency interval of the antenna structure 300. In other embodiments, the parasitic radiator 310 may be disposed on the second surface E2 of the substrate 110 instead, and the first end 311 of the parasitic radiator 310 may be directly coupled to the first ground radiator 160. The remaining features of the antenna structure 300 of fig. 3 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 4 shows a top view of an antenna structure 400 according to an embodiment of the invention. Fig. 4 is similar to fig. 2. In the embodiment of fig. 4, the antenna structure 400 further comprises a first additional radiating portion (Additional Radiation Element) 420 and one or more first conductive through elements 424. The first additional radiating part 420 may be made of a metal material. The first additional radiating portion 420 and the second circuit element 182 may be disposed on the second surface E2 of the substrate 110. In some embodiments, the first additional radiating portion 420 has substantially the same width as the extension portion 150 of the feed-in radiating portion 120. The first conductive through-elements 424 penetrate the substrate 110, wherein the extension portion 150 of the feed-in radiation portion 120 is coupled to the second circuit element 182 via the first conductive through-elements 424 and the first additional radiation portion 420. That is, the second circuit element 182 is coupled between the second ground radiating portion 170 and the first additional radiating portion 420. Since the second ground radiating portion 170, the second circuit element 182, and the first additional radiating portion 420 are all located on the same plane, the design can reduce the assembling difficulty of the second circuit element 182 without affecting the operation bandwidth of the antenna structure 400. It has to be noted that after adding the first additional radiating portion 420, the length of the extension portion 150 feeding the radiating portion 120 may be correspondingly shortened. The remaining features of the antenna structure 400 of fig. 4 are similar to those of the antenna structure 200 of fig. 2, so that similar operation effects can be achieved in both embodiments.

Fig. 5 shows a top view of an antenna structure 500 according to an embodiment of the invention. Fig. 5 is similar to fig. 2. In the embodiment of fig. 5, the antenna structure 500 further comprises a second additional radiating portion 530 and one or more second conductive through-elements 534. The second additional radiating part 530 may be made of a metal material. The second additional radiating portion 530 and the second circuit element 182 may be disposed on the first surface E1 of the substrate 110. In some embodiments, the second additional radiating portion 530 has substantially the same width as the second ground radiating portion 170. The second conductive through-elements 534 can penetrate the substrate 110, wherein the second ground radiating portion 170 is coupled to the second circuit element 182 via the second conductive through-elements 534 and the second additional radiating portion 530. That is, the second circuit element 182 is coupled between the second additional radiating portion 530 and the extension portion 150 of the feeding radiating portion 120. Since the second additional radiating portion 530, the second circuit element 182, and the feeding radiating portion 120 are all located on the same plane, the design can reduce the assembling difficulty of the second circuit element 182, and the operation bandwidth of the antenna structure 500 is not affected. It must be noted that after the addition of the second additional radiating portion 530, the length of the second ground radiating portion 170 may be correspondingly shortened. The remaining features of the antenna structure 500 of fig. 5 are similar to those of the antenna structure 200 of fig. 2, so that similar operation effects can be achieved in both embodiments.

Fig. 6A shows a top view of an antenna structure 601 according to an embodiment of the invention. Fig. 6B shows a top view of an antenna structure 602 according to an embodiment of the invention. Fig. 6C shows a top view of an antenna structure 603 according to an embodiment of the invention. Fig. 6D shows a top view of an antenna structure 604 according to an embodiment of the invention. As shown in fig. 6A, 6B, 6C, and 6D, the bridge portion 140 may also have a trapezoid shape or any triangle shape to fine tune the Coupling Amount (Coupling Amount) between itself and the first protruding portion 165 or the second protruding portion 175. According to the actual measurement result, if the coupling amount increases, the operating frequency of the antenna structure will correspondingly increase, and if the coupling amount decreases, the operating frequency of the antenna structure will correspondingly decrease.

Fig. 7A shows a top view of an antenna structure 700 according to an embodiment of the invention. Fig. 7A is similar to fig. 1A. In the embodiment of fig. 7A, the antenna structure 700 further includes a Tuning Circuit (Tuning Circuit) 790. Fig. 7B is a schematic diagram of the adjusting circuit 790 according to an embodiment of the invention. As shown in fig. 7A and 7B, the adjustment circuit 790 includes a plurality of impedance elements (Impedance Element) 791, 792, 793, 794 and a switching Element (Switch Element) 795. For example, the impedance elements 791, 792, 793, 794 may be inductors having different inductance values, capacitors having different capacitance values, or any combination thereof, but are not limited thereto. The switching element 795 selects one of the impedance elements 791, 792, 793, 794 according to a control signal SC such that the first circuit element 181 can be coupled to the first ground radiating portion 160 via the selected impedance element. For example, the control signal SC may be generated by a processor (not shown) based on a user input. According to the actual measurement result, by using the adjusting circuit 790 to select different ground impedance values, the operation bandwidth of the antenna structure 700 can be greatly increased. It should be noted that the number of the impedance elements 791, 792, 793, 794 is not particularly limited in the present invention, and the shape of the first protruding portion 165 of the first ground radiating portion 160 can be adjusted correspondingly after the adjustment circuit 790 is added. The remaining features of the antenna structure 700 of fig. 7A and 7B are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 8 shows a perspective view of an antenna structure 800 according to an embodiment of the invention. Fig. 8 is similar to fig. 1A. In the embodiment of fig. 8, a second grounding radiation portion 870 of the antenna structure 800 is at least partially disposed on a plane substantially perpendicular to the first surface E1 of the substrate 110, but a second protruding portion 875 of the second grounding radiation portion 870 is still disposed on the second surface E2 of the substrate 110. In addition, a body portion 830 of a feeding radiation portion 820 of the antenna structure 800 may be disposed at least partially on the plane substantially perpendicular to the first surface E1 of the substrate 110. That is, the feeding radiation portion 820 and the second grounding radiation portion 870 may have a planar structure, a three-dimensional structure, or any combination thereof, so as to save the design space on the substrate 110. The remaining features of the antenna structure 800 of fig. 8 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 9 shows a top view of an antenna structure 900 according to an embodiment of the invention. Fig. 9 is similar to fig. 5. In the embodiment of fig. 9, a feed-in radiation portion 920 of the antenna structure 900 includes a body portion 130, a bridge portion 940, and an extension portion 950, wherein the bridge portion 940 may have a substantially rectangular shape, and the extension portion 950 may have a substantially rectangular shape. The shape change of the bridge portion 940 and the extension portion 950 may increase the design flexibility of the antenna structure 900. The remaining features of the antenna structure 900 of fig. 9 are similar to those of the antenna structure 500 of fig. 5, so that similar operation effects can be achieved in both embodiments.

Fig. 10 shows a top view of an antenna structure 1000 according to an embodiment of the invention. Fig. 10 is similar to fig. 5. In the embodiment of fig. 10, a feed radiation portion 1020 of the antenna structure 1000 includes a body portion 130, a bridge portion 1040, and an extension portion 1050, wherein the bridge portion 1040 may substantially have a T-shape, and the extension portion 1050 may substantially have an elongated square shape. The shape change of the bridging portion 1040 and the extension portion 1050 may increase the design flexibility of the antenna structure 1000. The remaining features of the antenna structure 1000 of fig. 10 are similar to those of the antenna structure 500 of fig. 5, so that similar operation effects can be achieved in both embodiments.

Fig. 11 shows a top view of an antenna structure 1100 according to an embodiment of the invention. Fig. 11 is similar to fig. 5. In the embodiment of fig. 11, the antenna structure 1100 further includes one or more third conductive penetrating elements 1134, and a first ground radiation portion 1160 of the antenna structure 1100 is disposed on the first surface E1 of the substrate 110. The third conductive through-elements 1134 may penetrate the substrate 110, wherein the first ground radiation 1160 may be coupled to a first protruding portion 1165 on the second surface E2 of the substrate 110 via the third conductive through-elements 1134. That is, the first ground radiating portion 1160 and the first protruding portion 1165 thereof may be disposed on the first surface E1 and the second surface E2 of the substrate 110, respectively, which may increase the design flexibility of the antenna structure 1100. The remaining features of the antenna structure 1100 of fig. 11 are similar to those of the antenna structure 500 of fig. 5, so that similar operation effects can be achieved in both embodiments.

Fig. 12 shows a top view of an antenna structure 1200 according to an embodiment of the invention. Fig. 12 is similar to fig. 9. In the embodiment of fig. 12, a first ground radiating portion 1260 of the antenna structure 1200 includes a first protruding portion 1265, and a second ground radiating portion 1270 of the antenna structure 1200 includes a second protruding portion 1275, wherein the first protruding portion 1265 and the second protruding portion 1275 may each have a straight strip shape, and the first circuit element 181 is coupled between the first protruding portion 1265 and the second protruding portion 1275. The shape change of the first protruding portion 1265 and the second protruding portion 1275 may increase design flexibility of the antenna structure 1200. The remaining features of the antenna structure 1200 of fig. 12 are similar to those of the antenna structure 900 of fig. 9, so that similar operation effects can be achieved in both embodiments.

Fig. 13 shows a top view of an antenna structure 1300 according to an embodiment of the invention. Fig. 13 is similar to fig. 5. In the embodiment of fig. 13, a first ground radiating portion 1360 of the antenna structure 1300 does not include any first protruding portion, and a second ground radiating portion 1370 of the antenna structure 1300 includes a second protruding portion 1375, wherein the second protruding portion 1375 may have an inverted triangle shape or an inverted trapezoid shape, and the first circuit element 181 is coupled between the second protruding portion 1375 and the first ground radiating portion 1360. The shape change of the first and second ground radiating portions 1360 and 1370 may increase design flexibility of the antenna structure 1300. The remaining features of the antenna structure 1300 of fig. 13 are similar to those of the antenna structure 500 of fig. 5, so that similar operation effects can be achieved in both embodiments.

Fig. 14 shows a top view of an antenna structure 1400 according to an embodiment of the invention. Fig. 14 is similar to fig. 5. In the embodiment of fig. 14, a first ground radiating portion 1460 of the antenna structure 1400 includes a first protruding portion 1465, and a second ground radiating portion 1470 of the antenna structure 1400 does not include any second protruding portion, wherein the first protruding portion 1465 may have a triangular shape or a trapezoid shape, and the first circuit element 181 is coupled between the first protruding portion 1465 and the second ground radiating portion 1470. The shape change of the first and second ground radiating portions 1460 and 1470 may increase the design flexibility of the antenna structure 1400. The remaining features of the antenna structure 1400 of fig. 14 are similar to those of the antenna structure 500 of fig. 5, so that similar operation effects can be achieved in both embodiments.

The present invention proposes a novel antenna structure. Compared with the traditional design, the invention has the advantages of at least small size, wide frequency band, low manufacturing cost and the like, so that the invention is very suitable for being applied to various mobile communication devices.

It should be noted that the device size, device shape, device parameters, and frequency range are not limitations of the present invention. The antenna designer may adjust these settings according to different needs. The antenna structure of the present invention is not limited to the state illustrated in fig. 1A to 14. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1A-14. In other words, not all of the illustrated features need be implemented in the antenna structure of the present invention at the same time.

Ordinal numbers such as "first," "second," "third," and the like in the description and in the claims are used for distinguishing between two different elements having the same name and not necessarily for describing a sequential order.

While the invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited thereto, but rather, it should be apparent to one skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An antenna structure, the antenna structure comprising:

a substrate having a first surface and a second surface opposite to each other;

the feed-in radiation part comprises a body part, a bridging part and an extension part, wherein the body part is provided with a feed-in point, and the bridging part is coupled between the body part and the extension part;

a first ground radiating portion coupled to a ground potential;

a second grounding radiation part; and

a first circuit element coupled between the first and second ground radiating portions;

the bridge portion of the feed-in radiation portion is disposed on the first surface of the substrate, and the first circuit element is disposed on the second surface of the substrate.

2. The antenna structure of claim 1, wherein the antenna structure covers an ultra-wideband frequency band that includes at least a first frequency range from 699MHz to 960MHz and a second frequency range from 1710MHz to 2690 MHz.

3. The antenna structure of claim 1, wherein the body portion of the feed-in radiating portion has an L-shape.

4. The antenna structure of claim 2, wherein the length of the body portion of the feed-in radiating portion is less than or equal to 0.25 times the wavelength of the second frequency interval.

5. The antenna structure of claim 1, wherein the bridge portion of the feed-in radiating portion has a triangular shape, a T-shape, or a rectangular shape.

6. The antenna structure of claim 1, wherein the extension portion of the feed-in radiating portion has a meandering shape or an elongated square shape and is the smallest width of the feed-in radiating portion.

7. The antenna structure of claim 2, wherein a total length of the bridge portion and the extension portion of the feed-in radiating portion is less than or equal to 0.25 times wavelength of the first frequency interval.

8. The antenna structure of claim 1, wherein the first ground radiating portion has a longer straight strip shape and further comprises a first protruding portion, and the first protruding portion has a trapezoid shape or a straight strip shape.

9. The antenna structure of claim 8, wherein the second ground radiating portion presents a shorter straight strip shape and further comprises a second protruding portion, and the second protruding portion presents an inverted trapezoid or straight strip shape.

10. The antenna structure of claim 2, wherein the length of the second ground radiating portion is less than or equal to 0.25 times the wavelength of the first frequency interval.

11. The antenna structure of claim 1, wherein the first circuit element is an inductor, and an inductance value of the inductor is greater than or equal to 1nH.

12. The antenna structure of claim 9, wherein the bridge portion of the feed-in radiating portion has a vertical projection on the second surface of the substrate, and the vertical projection overlaps at least one of the first protruding portion or the second protruding portion.

13. The antenna structure of claim 1, further comprising:

the second circuit element is coupled between the second grounding radiation part and the extension part of the feed-in radiation part.

14. The antenna structure of claim 13, wherein the second circuit element is a capacitor, and a capacitance of the capacitor is greater than or equal to 0.1pF.

15. The antenna structure of claim 13, further comprising:

a first additional radiation part arranged on the second surface of the substrate; and

one or more first conductive through elements penetrating the substrate, wherein the extension portion of the feed-in radiating portion is coupled to the second circuit element via the first conductive through elements and the first additional radiating portion.

16. The antenna structure of claim 13, further comprising:

a second additional radiation part arranged on the first surface of the substrate; and

one or more second conductive through-elements penetrate the substrate, wherein the second ground radiating portion is coupled to the second circuit element via the second conductive through-elements and the second additional radiating portion.

17. The antenna structure of claim 2, further comprising:

and a parasitic radiating portion coupled to the first ground radiating portion, wherein the parasitic radiating portion is adjacent to the extension portion of the feed radiating portion but separated from the extension portion of the feed radiating portion.

18. The antenna structure of claim 17, wherein the length of the parasitic radiating portion is less than or equal to 0.25 times the wavelength of the second frequency interval.

19. The antenna structure of claim 1, wherein the second ground radiating portion is disposed on the second surface of the substrate or partially disposed on a plane substantially perpendicular to the first surface of the substrate.

20. The antenna structure of claim 1, further comprising an adjustment circuit comprising:

a plurality of impedance elements; and

and a switching element selecting one of the impedance elements according to a control signal, such that the first circuit element is coupled to the first ground radiating portion via the selected impedance element.