CN115275571A - Antenna structure - Google Patents

Abstract

The invention provides an antenna structure, which comprises a first radiation part, a second radiation part, a third radiation part, a fourth radiation part and a dielectric substrate. The first radiating portion is coupled to a ground potential, wherein the first radiating portion includes an unequal width portion. The second radiation part is provided with a feed point, wherein the second radiation part is adjacent to the first radiation part. The third radiating portion is coupled to the unequal-width portion of the first radiating portion. The fourth radiation portion is coupled to the second radiation portion. The dielectric substrate is provided with a first surface and a second surface which are opposite, wherein the second radiation part and the fourth radiation part are arranged on the first surface of the dielectric substrate, and the first radiation part and the third radiation part are arranged on the second surface of the dielectric substrate. The antenna structure of the invention has small size, wide frequency band and low manufacturing cost, and is suitable for various mobile communication devices.

Description

Antenna structure

Technical Field

The present invention relates to antenna structures, and particularly to a broadband 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: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz used therein for communication, and some cover short-distance wireless communication ranges, for example: wi-Fi and Bluetooth systems use 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 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.

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, including: a first radiating portion coupled to a ground potential, wherein the first radiating portion includes a non-uniform width portion; a second radiation part with a feed point, wherein the second radiation part is adjacent to the first radiation part; a third radiating portion coupled to the unequal-width portion of the first radiating portion; a fourth radiation part coupled to the second radiation part; the dielectric substrate is provided with a first surface and a second surface which are opposite; the second radiation part and the fourth radiation part are arranged on the first surface of the dielectric substrate, and the first radiation part and the third radiation part are arranged on the second surface of the dielectric substrate.

In some embodiments, the unequal width portion of the first radiating portion exhibits a trapezoidal shape.

In some embodiments, the second radiating portion exhibits a serpentine shape.

In some embodiments, the third radiating portion has an L-shape.

In some embodiments, the fourth radiation portion has a straight bar shape.

In some embodiments, the antenna structure further comprises: a fifth radiation part, coupled to the feed point, disposed on the first surface of the dielectric substrate, wherein the fifth radiation part is L-shaped.

In some embodiments, the fifth radiation part has a vertical projection on the second surface of the dielectric substrate, and the vertical projection at least partially overlaps with the unequal width portion of the first radiation part.

In some embodiments, the antenna structure further comprises: and the sixth radiation part is coupled to the grounding potential and arranged on the first surface of the dielectric substrate, wherein the sixth radiation part is in a straight strip shape.

In some embodiments, the antenna structure covers a first frequency band between 600MHz to 700MHz, a second frequency band between 700MHz to 960MHz, a third frequency band between 1710MHz to 2170MHz, a fourth frequency band between 2300MHz to 2700MHz, a fifth frequency band between 3300MHz to 4800MHz, and a sixth frequency band between 5000MHz to 6000 MHz.

In some embodiments, the length of the first radiating portion is substantially equal to 0.25 times the wavelength of the first frequency band, the length of the second radiating portion is substantially equal to 0.25 times the wavelength of the second frequency band, the length of the third radiating portion is between 0.125 times and 0.25 times the wavelength of the third frequency band, the length of the fourth radiating portion is less than or equal to 0.125 times the wavelength of the fourth frequency band, the length of the fifth radiating portion is substantially equal to 0.25 times the wavelength of the fifth frequency band, and the length of the sixth radiating portion is substantially equal to 0.25 times the wavelength of the sixth frequency band.

The invention has the beneficial effects that: the antenna structure of the invention has small size, wide frequency band and low manufacturing cost, and is suitable for various mobile communication devices.

Drawings

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

Fig. 2 is a top view of a part of elements of the antenna structure on the first surface of the dielectric substrate according to an embodiment of the invention.

Fig. 3 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. 4 shows a side view of an antenna structure according to an embodiment of the invention.

Fig. 5 shows a return loss diagram of an antenna structure according to an embodiment of the invention.

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

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

Description of reference numerals:

100,700 antenna structure

110 first radiation part

111 first end of first radiating section

112 second end of the first radiating portion

115 unequal width part of the first radiating part

120 second radiation part

121 first end of second radiation part

122 second end of the second radiating part

130: third radiation part

131 first end of third radiation part

132 second end of third radiation part

135, the narrower part of the third radiating part

136 wide part of the third radiation part

140 fourth radiation part

141 first end of fourth radiation part

142 the second end of the fourth radiation part

150 fifth radiation part

151 first end of fifth radiation part

152 second end of fifth radiation part

160 sixth radiation part

161 first end of sixth radiation part

162 second end of sixth radiating portion

170 dielectric substrate

CP1 first connection Point

CP2 second connection Point

E1 first surface

E2 second surface

FB1 first frequency band

FB 2-second frequency band

FB3: third frequency band

FB 4-fourth frequency band

FB5 fifth frequency band

FB6 sixth frequency band

FP feed point

GC1 first coupling gap

GC2 second coupling gap

H1: height

H2 thickness

L1, L2, L3, L4, L5, L6 length

VSS ground potential

W2, W31, W32, W4, W6, WB, WT width

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 herein to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The present invention does not use the difference in names as a way of distinguishing elements, but uses the difference in functions of elements as a criterion for distinguishing. In the following description, 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 their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the disclosure states a first feature formed over or on a second feature, that description may include embodiments in which the first and second features are formed in direct contact, that description may also include embodiments in which additional features may be formed interposing the first and second features, such that the first and second features may not be in direct contact. In addition, different examples of the following disclosure may repeat reference numerals and/or signs. These iterations are not intended to limit the specific relationship between the various embodiments and/or configurations discussed herein for purposes of simplicity and clarity.

Fig. 1 shows a top view of an Antenna Structure (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 includes: a first Radiation portion (Radiation Element) 110, a second Radiation portion 120, a third Radiation portion 130, a fourth Radiation portion 140, a fifth Radiation portion 150, a sixth Radiation portion 160, and a Dielectric Substrate (Dielectric Substrate) 170, wherein the first Radiation portion 110, the second Radiation portion 120, the third Radiation portion 130, the fourth Radiation portion 140, the fifth Radiation portion 150, and the sixth Radiation portion 160 are all made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof.

The dielectric substrate 170 may be an FR4 (film resistor 4) substrate, a Printed Circuit Board (PCB), or a Flexible Printed Circuit (FPC). The dielectric substrate 170 has a first surface E1 and a second surface E2 opposite to each other, wherein the second radiation portion 120, the fourth radiation portion 140, the fifth radiation portion 150, and the sixth radiation portion 160 are disposed on the first surface E1 of the dielectric substrate 170, and the first radiation portion 110 and the third radiation portion 130 are disposed on the second surface E2 of the dielectric substrate 170. Fig. 2 is a top view of a part of elements of the antenna structure 100 on the first surface E1 of the dielectric substrate 170 according to an embodiment of the invention. Fig. 3 is a perspective view of another part of the elements of the antenna structure 100 on the second surface E2 of the dielectric substrate 170 according to an embodiment of the invention (i.e., the dielectric substrate 170 is regarded as a transparent element). Fig. 4 shows a side view of the antenna structure 100 according to an embodiment of the invention. Please refer to fig. 1 to 4 together to understand the present invention.

The first radiation portion 110 may substantially exhibit a Meandering Structure (Meandering Structure) of unequal width. In detail, the first radiation portion 110 has a first End 111 and a second End 112, wherein the first End 111 of the first radiation portion 110 is coupled to a Ground Voltage VSS (e.g., 0V), and the second End 112 of the first radiation portion 110 is an Open End (Open End). For example, the Ground potential VSS may be provided by a System Ground Plane (not shown). It should be noted that the first radiation portion 110 includes a non-uniform width portion 115, which may substantially assume a trapezoid shape. In addition, the top side width WT of the unequal width sections 115 may be greater than the bottom side width WB of the unequal width sections 115.

The second radiating portion 120 may have a substantially serpentine structure with a uniform width. In detail, the second radiation portion 120 has a first End 121 and a second End 122, wherein a Feeding Point (Feeding Point) FP is located at the first End 121 of the second radiation portion 120, and the second End 122 of the second radiation portion 120 is an Open End (Open End). The feed point FP may be further coupled to a Signal Source (not shown), for example: a Radio Frequency (RF) module may be used to excite the antenna structure 100. The second radiating portion 120 is adjacent to the first radiating portion 110, wherein a first Coupling Gap (Coupling Gap) GC1 may be formed between the second radiating portion 120 and the first radiating portion 110. 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., 5mm or less), and may also include the case where two corresponding elements are in direct contact with each other (i.e., the distance is shortened to 0). In some embodiments, the second radiating portion 120 is configured along at least a portion of the first radiating portion 110. For example, the second end 122 of the second radiation portion 120 and the second end 112 of the first radiation portion 110 may extend in substantially the same direction, and the two ends may be aligned with each other.

The third radiation portion 130 may substantially have an L-shape. In detail, the third radiation portion 130 has a first end 131 and a second end 132, wherein the first end 131 of the third radiation portion 130 is coupled to a first Connection Point (Connection Point) CP1 on the unequal-width portion 115 of the first radiation portion 110, and the second end 132 of the third radiation portion 130 is an open end. In some embodiments, the third radiation portion 130 includes a narrow portion 135 and a wide portion 136, wherein the narrow portion 135 is adjacent to the first end 131 of the third radiation portion 130, and the wide portion 136 is adjacent to the second end 132 of the third radiation portion 130.

The fourth radiation portion 140 may substantially have a straight bar shape. In detail, the fourth radiation portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the fourth radiation portion 140 is coupled to a second connection point CP2 on the second radiation portion 120, and the second end 142 of the fourth radiation portion 140 is an open end. For example, the second end 142 of the fourth radiation portion 140 and the second end 132 of the third radiation portion 130 may extend in substantially the same direction.

The fifth radiation portion 150 may substantially have an L-shape. In detail, the fifth radiation portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the fifth radiation portion 150 is coupled to the feed point FP, and the second end 152 of the fifth radiation portion 150 is an open end. For example, the second end 152 of the fifth radiation portion 150 and the second end 142 of the fourth radiation portion 140 may extend in substantially opposite directions. In some embodiments, the fifth radiation portion 150 has a Vertical Projection (Vertical Projection) on the second surface E2 of the dielectric substrate 170, and the Vertical Projection at least partially overlaps with the unequal-width portion 115 of the first radiation portion 110. In addition, the fifth radiation part 150 is adjacent to the first radiation part 110, wherein a second coupling gap GC2 may be formed between the fifth radiation part 150 and the first radiation part 110. It should be understood that the fifth radiation portion 150 is an Optional Element (Optional Element), and may be removed in other embodiments.

The sixth radiation portion 160 may substantially have a straight bar shape. In detail, the sixth radiation portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the sixth radiation portion 160 is coupled to the ground potential VSS, and the second end 162 of the sixth radiation portion 160 is an open end and is adjacent to the feed point FP. For example, the second end 162 of the sixth radiation portion 160 and the second end 152 of the fifth radiation portion 150 may extend in substantially the same direction. It should be understood that the sixth radiation portion 160 is an optional element, and can be removed in other embodiments.

Fig. 5 shows a Return Loss (Return Loss) diagram of the antenna structure 100 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the Return Loss (dB). According to the measurement results shown in fig. 5, the antenna structure 100 covers a first Frequency Band (Frequency Band) FB1, a second Frequency Band FB2, a third Frequency Band FB3, a fourth Frequency Band FB4, a fifth Frequency Band FB5, and a sixth Frequency Band FB6. For example, the first frequency band FB1 may be between 600MHz and 700MHz, the second frequency band FB2 may be between 700MHz and 960MHz, the third frequency band FB3 may be between 1710MHz and 2170MHz, the fourth frequency band FB4 may be between 2300MHz and 2700MHz, the fifth frequency band FB5 may be between 3300MHz and 4800MHz, and the sixth frequency band FB6 may be between 5000MHz and 6000 MHz. Therefore, the antenna structure 100 will support at least the wide band operation of the Sub-6GHz band for new generation 5G communications.

In terms of antenna principle, the first radiation portion 110 can excite the first frequency band FB1, the second radiation portion 120 can excite the second frequency band FB2, the third radiation portion 130 can excite the third frequency band FB3, the fourth radiation portion 140 can excite the fourth frequency band FB4, the fifth radiation portion 150 can excite the fifth frequency band FB5, and the sixth radiation portion 160 can excite the sixth frequency band FB6. According to the actual measurement result, the unequal width part 115 of the first radiation part 110 helps to fine tune the Impedance Matching (Impedance Matching) of the first frequency band FB1 and the second frequency band FB2, while effectively increasing the Operation Bandwidth (Operation Bandwidth) thereof. Similarly, the design of the third radiation portion 130 with different widths can also increase the operation bandwidth of the third frequency band FB 3.

Fig. 6 shows a Radiation Efficiency (Radiation Efficiency) diagram of an antenna structure of the mobile device 100 according to an embodiment of the present 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 100 in the first frequency band FB1, the second frequency band FB2, the third frequency band FB3, the fourth frequency band FB4, the fifth frequency band FB5, and the sixth frequency band FB6 can almost reach-6 dB or higher, which can meet the practical application requirements of the new generation 5G 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 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure 100. In the first radiation section 110, a top side width WT of the non-uniform width portion 115 may be between 5mm and 10mm, a bottom side width WB of the non-uniform width portion 115 may be between 2mm and 5mm, and a height H1 of the non-uniform width portion 115 may be between 8mm and 10 mm. The length L2 of the second radiation part 120 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure 100. The width W2 of the second radiation part 120 may be between 1mm and 2mm. The length L3 of the third radiation portion 130 may be between 0.125 and 0.25 wavelengths (λ/8- λ/4) of the third frequency band FB3 of the antenna structure 100. In the third radiation portion 130, the width W32 of the wider portion 136 may be 2 to 5 times the width W31 of the narrower portion 135. The length L4 of the fourth radiation part 140 may be less than or equal to 0.125 times the wavelength (λ/8) of the fourth frequency band FB4 of the antenna structure 100. The width W4 of the fourth radiation portion 140 may be between 2mm and 6 mm. The length L5 of the fifth radiation part 150 may be substantially equal to 0.25 times the wavelength (λ/4) of the fifth frequency band FB5 of the antenna structure 100. The length L6 of the sixth radiation part 160 may be substantially equal to 0.25 times the wavelength (λ/4) of the sixth frequency band FB6 of the antenna structure 100. The width W6 of the sixth radiation portion 160 may be between 3mm and 5 mm. The thickness H2 of the dielectric substrate 170 may be between 0.02mm and 1.6 mm. The width of the first coupling gap GC1 may be less than or equal to 2mm. The width of the second coupling gap GC2 may be between 1mm and 2mm. The above size ranges are found from multiple experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 100.

Fig. 7 is a top view of an antenna structure 700 according to another embodiment of the invention. Fig. 7 is similar to fig. 1. In the embodiment of fig. 7, the antenna structure 700 does not include the fifth and sixth radiating portions 150 and 160. According to the actual measurement results, even if the fifth radiation portion 150 and the sixth radiation portion 160 are removed, the antenna structure 700 can cover the first frequency band FB1, the second frequency band FB2, the third frequency band FB3, and the fourth frequency band FB4, which can meet the medium and low frequency operation requirements of the new generation 5G communication. The remaining features of the antenna structure 700 of fig. 7 are similar to those of the antenna structure 100 of fig. 1-4, so that similar operation can be achieved in both embodiments.

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

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 shown in fig. 1-7. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1-7. 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 specification and in the claims, do not have a sequential relationship with each other, but are used merely to identify two different elements having the same name.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An antenna structure, comprising:

a first radiating portion coupled to a ground potential, wherein the first radiating portion includes a non-uniform width portion;

a second radiation part with a feed point, wherein the second radiation part is adjacent to the first radiation part;

a third radiating portion coupled to the unequal-width portion of the first radiating portion;

a fourth radiation part coupled to the second radiation part; and

the dielectric substrate is provided with a first surface and a second surface which are opposite;

the second radiation part and the fourth radiation part are arranged on the first surface of the dielectric substrate, and the first radiation part and the third radiation part are arranged on the second surface of the dielectric substrate.

2. The antenna structure of claim 1, wherein the unequal width portion of the first radiating portion exhibits a trapezoidal shape.

3. The antenna structure of claim 1, wherein the second radiating portion exhibits a serpentine shape.

4. The antenna structure of claim 1, wherein the third radiating portion has an L-shape.

5. The antenna structure of claim 1, wherein the fourth radiating portion has a straight strip shape.

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

a fifth radiation part coupled to the feed point and disposed on the first surface of the dielectric substrate, wherein the fifth radiation part has an L-shape.

7. The antenna structure of claim 6, wherein the fifth radiating portion has a vertical projection on the second surface of the dielectric substrate, and the vertical projection at least partially overlaps with the unequal width portion of the first radiating portion.

8. The antenna structure of claim 6, further comprising:

and a sixth radiation part coupled to the ground potential and disposed on the first surface of the dielectric substrate, wherein the sixth radiation part has a straight strip shape.

9. The antenna structure of claim 8, wherein the antenna structure covers a first frequency band between 600MHz to 700MHz, a second frequency band between 700MHz to 960MHz, a third frequency band between 1710MHz to 2170MHz, a fourth frequency band between 2300MHz to 2700MHz, a fifth frequency band between 3300MHz to 4800MHz, and a sixth frequency band between 5000MHz to 6000 MHz.

10. The antenna structure of claim 9, characterized in that:

the length of the first radiation part is approximately equal to 0.25 times of the wavelength of the first frequency band;

a length of the second radiation section is substantially equal to 0.25 times a wavelength of the second frequency band;

the length of the third radiation part is between 0.125 and 0.25 times the wavelength of the third frequency band;

the length of the fourth radiation part is less than or equal to 0.125 times of the wavelength of the fourth frequency band;

a length of the fifth radiating portion is substantially equal to 0.25 times a wavelength of the fifth frequency band; and

the length of the sixth radiation section is substantially equal to 0.25 wavelength of the sixth frequency band.

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