CN221226561U - Antenna structure - Google Patents

Abstract

An antenna structure includes: a feed radiation part, a first radiation part, a second radiation part, a third radiation part, and a carrier element. The feed radiation part has a feed point. The first radiation part is coupled to the feed radiation part, wherein the first radiation part has a meandering structure. The second radiation part is coupled to the feed radiation part, wherein the second radiation part is adjacent to the first radiation part. The third radiation part is coupled to a ground potential, wherein the third radiation part is adjacent to the second radiation part. The feed radiation part, the first radiation part, the second radiation part, and the third radiation part are all arranged on the carrier element.

Description

Antenna structure

Technical Field

The utility model relates to an antenna structure, and in particular to an antenna structure with a wideband.

Background technique

With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as laptops, mobile phones, multimedia players and other hybrid portable electronic devices. In order to meet people's needs, mobile devices usually have wireless communication functions. Some cover long-distance wireless communication ranges, such as mobile phones using 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz frequency bands used for communication, while some cover short-distance wireless communication ranges, such as Wi-Fi, Bluetooth systems use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

Antennas are indispensable components in the field of wireless communications. If the operational bandwidth of an antenna used to receive or transmit signals is too narrow, it is easy to cause the communication quality of the mobile device to deteriorate. Therefore, how to design a small-sized, wide-bandwidth antenna structure is an important issue for designers.

Utility Model Content

In a preferred embodiment, the utility model proposes an antenna structure, including: a feed radiation portion having a feeding point; a first radiation portion coupled to the feed radiation portion, wherein the first radiation portion has a meandering structure; a second radiation portion coupled to the feed radiation portion, wherein the second radiation portion is adjacent to the first radiation portion; a third radiation portion coupled to a ground potential, wherein the third radiation portion is adjacent to the second radiation portion; and a carrier element, wherein the feed radiation portion, the first radiation portion, the second radiation portion, and the third radiation portion are all arranged on the carrier element.

In some embodiments, the first radiating portion is substantially in a U-shape.

In some embodiments, the first radiating portion includes an unequal width portion and a semicircular arc portion.

In some embodiments, the second radiating portion includes a wider portion and a narrower portion, and the narrower portion is coupled to the feeding radiating portion via the wider portion.

In some embodiments, the third radiating portion is in an L-shape with unequal widths.

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

In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 703 MHz and 803 MHz, the second frequency band is between 1710 MHz and 1880 MHz, and the third frequency band is between 1920 MHz and 2170 MHz.

In some embodiments, a total length of the feeding radiation portion and the first radiation portion is substantially equal to 0.25 times the wavelength of the first frequency band.

In some embodiments, a total length of the feeding radiation portion and the second radiation portion is substantially equal to 0.25 times the wavelength of the second frequency band.

In some embodiments, the length of the third radiation portion is between 0.125 times and 0.25 times the wavelength of the third frequency band.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing an antenna structure according to an embodiment of the present invention.

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

Description of Reference Numerals

100: Antenna structure

110: Feed radiation part

111: first end of the feed radiation part

112: Feed into the second end of the radiation portion

120: First radiation part

121: first end of the first radiation portion

122: second end of the first radiation portion

124: Unequal width portion of the first radiation portion

125: semicircular arc portion of the first radiation portion

130: Second radiation part

131: first end of the second radiation portion

132: second end of the second radiation portion

134: The wider part of the second radiation portion

135: Narrower part of the second radiation part

140: The third radiation

141: first end of the third radiation portion

142: second end of the third radiation portion

148: Gap in the third radiation part

150: carrier element

190:Signal source

FB1: First frequency band

FB2: Second frequency band

FB3: The third frequency band

FP: Feed Point

GC1: First coupling gap

GC2: Second coupling gap

L1, L2, L3: Length

R1: Radius

VSS: Ground potential

Detailed ways

In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the following specifically lists the specific embodiments of the present invention and describes them in detail with reference to the accompanying drawings.

Certain words are used in the specification and claims to refer to specific components. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. The words "include" and "comprise" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "include but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain error range. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

The following disclosure provides many different embodiments or examples to implement the different features of the present invention. The following disclosure describes specific examples of various components and their arrangement to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the present disclosure describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, the same reference symbols and/or marks may be reused in different examples of the following disclosure. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the specific relationship between the different embodiments and/or structures discussed.

In addition, spatially relative terms such as "below," "below," "lower," "above," "higher," and similar terms are used to facilitate description of the relationship between one element or feature and another element or features in the diagram. In addition to the orientation shown in the drawings, these spatially relative terms are intended to include different orientations of the device in use or operation. The device may be turned to different orientations (rotated 90 degrees or other orientations), and the spatially relative terms used herein may be interpreted accordingly.

FIG. 1 is a schematic diagram showing an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, such as a smart phone, a tablet computer, a notebook computer, a wireless access point, a router, or any device with communication function. Alternatively, the antenna structure 100 can be applied to an electronic device, such as any unit in the Internet of Things (IOT).

In the embodiment of FIG. 1 , the antenna structure 100 includes a feeding radiation element 110, a first radiation element 120, a second radiation element 130, a third radiation element 140, and a carrier element 150, wherein the feeding radiation element 110, the first radiation element 120, the second radiation element 130, and the third radiation element 140 can all be made of metal materials, such as copper, silver, aluminum, iron, or alloys thereof.

The feeding radiation portion 110 may be substantially in the shape of a straight strip. Specifically, the feeding radiation portion 110 has a first end 111 and a second end 112, wherein a feeding point FP is located at the first end 111 of the feeding radiation portion 110. The feeding point FP may be further coupled to a signal source 190. For example, the signal source 190 may be a radio frequency (RF) module, which may be used to excite the antenna structure 100.

The first radiating portion 120 has a meandering structure. For example, the first radiating portion 120 may be substantially U-shaped, but is not limited thereto. In detail, the first radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the first radiating portion 120 is coupled to the second end 112 of the feed radiating portion 110, and the second end 122 of the first radiating portion 120 is an open end. In some embodiments, the first radiating portion 120 includes a variable-width portion 124 adjacent to the first end 121 and a half-arc portion 125 adjacent to the second end 122. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements being less than a predetermined distance (e.g., 10 mm or less), and may also include a situation where two corresponding elements are in direct contact with each other (i.e., the aforementioned distance is shortened to 0).

The second radiating portion 130 may be substantially in the shape of a straight strip of unequal width. In detail, the second radiating portion 130 has a first end 131 and a second end 132, wherein the first end 131 of the second radiating portion 130 is coupled to the second end 112 of the feeding radiating portion 110, and the second end 132 of the second radiating portion 130 is an open end. For example, the second end 132 of the second radiating portion 130 and the second end 122 of the first radiating portion 120 may extend substantially in the same direction. In some embodiments, the second radiating portion 130 includes a wider portion (Wide Portion) 134 adjacent to the first end 131 and a narrower portion (Narrow Portion) 135 adjacent to the second end 132, wherein the narrower portion 135 may be coupled to the feeding radiating portion 110 via the wider portion 134. In some embodiments, the wider portion 134 of the second radiating portion 130 is adjacent to the second end 122 of the first radiating portion 120 , such that a first coupling gap GC1 is formed between the first radiating portion 120 and the second radiating portion 130 .

The third radiating portion 140 may be substantially L-shaped with unequal width. In detail, the third radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the third radiating portion 140 is coupled to a ground potential (Ground Voltage) VSS, and the second end 142 of the third radiating portion 140 is an open end. The ground potential VSS may be provided by a system ground plane (System Ground Plane) of the antenna structure 100 (not shown). For example, the second end 142 of the third radiating portion 140 and the second end 132 of the second radiating portion 130 may extend substantially in the same direction. In some embodiments, the third radiating portion 140 is adjacent to the wider portion 134 of the second radiating portion 130, wherein a second coupling gap GC2 may be formed between the second radiating portion 130 and the third radiating portion 140. In some embodiments, the third radiation portion 140 further has a notch 148 , which may be substantially in a rectangular or square shape and may be adjacent to the first end 141 of the third radiation portion 140 .

The feed radiation portion 110, the first radiation portion 120, the second radiation portion 130, and the third radiation portion 140 may all be disposed on the carrier element 150. The shape and type of the carrier element 150 are not particularly limited in the present invention. For example, the carrier element 150 may be a nonconductive support element, such as a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). In some embodiments, the antenna structure 100 may be a planar antenna structure. In other embodiments, the antenna structure 100 may also be changed into a three-dimensional antenna structure.

FIG. 2 is a diagram showing a voltage standing wave ratio (VSWR) of an 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 voltage standing wave ratio. According to the measurement results of FIG. 2 , the antenna structure 100 can cover a first frequency band FB1, a second frequency band FB2, and a third frequency band FB3. For example, the first frequency band FB1 can be between 703 MHz and 803 MHz, the second frequency band FB2 can be between 1710 MHz and 1880 MHz, and the third frequency band FB3 can be between 1920 MHz and 2170 MHz. Therefore, the antenna structure 100 can at least support broadband operation of LTE (Long Term Evolution).

In some embodiments, the operating principle of the antenna structure 100 may be as described below. The feed radiating portion 110 and the first radiating portion 120 may be jointly excited to generate the aforementioned first frequency band FB1. The feed radiating portion 110 and the second radiating portion 130 may be jointly excited to generate the aforementioned second frequency band FB2. The third radiating portion 140 may be coupled and excited by the feed radiating portion 110 and the second radiating portion 130 to generate the aforementioned third frequency band FB3. According to actual measurement results, the semicircular arc portion 125 of the first radiating portion 120 may be used to fine-tune the impedance matching (Impedance Matching) of the aforementioned first frequency band FB1. In addition, the unequal width design of the second radiating portion 130 and the third radiating portion 140 may be used to provide more current paths (Current Path), thereby increasing the bandwidth (Bandwidth) of the aforementioned second frequency band FB2 and the third frequency band FB3.

In some embodiments, the element sizes of the antenna structure 100 may be as described below. The total length L1 of the feed radiation portion 110 and the first radiation portion 120 may be approximately equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure 100. The total length L2 of the feed radiation portion 110 and the second radiation portion 130 may be approximately equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure 100. The length L3 of the third radiation portion 140 may be between 0.125 times and 0.25 times the wavelength (λ/8 to λ/4) of the third frequency band FB3 of the antenna structure 100. The radius R1 of the semicircular arc portion 125 of the first radiation portion 120 may be between 2 mm and 3 mm. The width of the first coupling gap GC1 may be between 3 mm and 4 mm. The width of the second coupling gap GC2 may be between 0.2 mm and 0.4 mm. The above ranges of element sizes are obtained based on multiple experimental results, which are helpful to optimize the operational bandwidth and impedance matching of the antenna structure 100 .

In some embodiments, the antenna structure 100 described above can be applied to a point of sale (POS) system (not shown). Since the POS system includes the antenna structure 100 described above, the POS system can support the function of wireless communication. In some embodiments, the POS system further includes an RF circuit, a filter, an amplifier, a processor, or (and) a housing, but is not limited thereto.

The utility model proposes a novel antenna structure. Compared with the traditional design, the utility model has at least the advantages of small size, wide bandwidth, and low manufacturing cost, so it is very suitable for application in various mobile communication devices or the Internet of Things.

It is worth noting that the above-mentioned component size, component shape, and frequency range are not limiting conditions of the present invention. Antenna designers can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the state shown in Figures 1-2. The present invention may only include any one or more features of any one or more embodiments of Figures 1-2. In other words, not all the features shown in the figure need to be implemented in the antenna structure of the present invention at the same time.

In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to distinguish two different components with the same name.

Although the present invention is disclosed as above with reference to the preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the appended claims.

Claims (10)

1. An antenna structure, comprising: A feeding radiation portion having a feeding point; a first radiating portion, coupled to the feeding radiating portion, wherein the first radiating portion has a meandering structure; a second radiating portion coupled to the feeding radiating portion, wherein the second radiating portion is adjacent to the first radiating portion; a third radiating portion coupled to a ground potential, wherein the third radiating portion is adjacent to the second radiating portion; and A carrier element, wherein the feed radiation part, the first radiation part, the second radiation part, and the third radiation part are all disposed on the carrier element. 2 . The antenna structure as claimed in claim 1 , wherein the first radiating portion is substantially in a U-shape. 3 . The antenna structure as claimed in claim 1 , wherein the first radiating portion comprises an unequal width portion and a semicircular arc portion. 4 . The antenna structure as claimed in claim 1 , wherein the second radiating portion comprises a wider portion and a narrower portion, and the narrower portion is coupled to the feeding radiating portion via the wider portion. 5 . The antenna structure as claimed in claim 1 , wherein the third radiating portion is in an L-shape with unequal width. 6 . The antenna structure as claimed in claim 1 , wherein a first coupling gap is formed between the first radiating portion and the second radiating portion, and a second coupling gap is formed between the second radiating portion and the third radiating portion. 7. The antenna structure as described in claim 1 is characterized in that the antenna structure covers a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 703 MHz and 803 MHz, the second frequency band is between 1710 MHz and 1880 MHz, and the third frequency band is between 1920 MHz and 2170 MHz. 8 . The antenna structure as claimed in claim 7 , wherein a total length of the feed radiation portion and the first radiation portion is substantially equal to 0.25 times the wavelength of the first frequency band. 9 . The antenna structure as claimed in claim 7 , wherein a total length of the feed radiation portion and the second radiation portion is substantially equal to 0.25 times the wavelength of the second frequency band. 10 . The antenna structure as claimed in claim 7 , wherein a length of the third radiating portion is between 0.125 times and 0.25 times the wavelength of the third frequency band.