CN111276810A

CN111276810A - Chip antenna

Info

Publication number: CN111276810A
Application number: CN202010098489.6A
Authority: CN
Inventors: 简瑞志; 谢智森; 游舜荃; 翁嘉骏; 周建宏
Original assignee: Universal Global Technology Kunshan Co Ltd
Current assignee: Universal Global Technology Kunshan Co Ltd
Priority date: 2020-02-18
Filing date: 2020-02-18
Publication date: 2020-06-12

Abstract

The invention provides a chip antenna which comprises a body, a grounding radiation metal and a feed-in radiation metal, wherein the body comprises a first surface and a second surface. The grounding radiation metal comprises two longitudinal radiation arms, a transverse radiation arm and a coupling hole, the two longitudinal radiation arms are arranged on the first surface at intervals, each longitudinal radiation arm comprises a front end and a tail end, the front ends are electrically connected with the grounding wire, the tail ends are opposite to the front ends, and the transverse radiation arms are connected with the two tail ends. The coupling hole penetrates the body from the transverse radiating arm to the second surface and comprises radiating inner wall metal, wherein one end of the radiating inner wall metal is connected to the transverse radiating arm to be used for electrical connection, and the other end of the radiating inner wall metal is not used for electrical connection. The feed radiation metal comprises a feed radiator which is positioned on the first surface and between the two longitudinal radiation arms. Thereby reducing the volume.

Description

Chip antenna

Technical Field

The present invention relates to an antenna, and more particularly, to a chip antenna having a coupling hole for coupling.

Background

The development of technology has led to the prevalence of electronic devices, which are generally equipped with wireless communication or satellite positioning functions, and in order to achieve such functions, the electronic devices need to be equipped with antennas for communication or positioning.

With the miniaturization of electronic devices, the size of antennas is also required to be reduced, but the performance requirements of antennas are increasing, so the conventional antennas are not suitable for the needs. Therefore, manufacturers have developed chip antennas that use the epsilon change of the material or winding method to reduce the size of the antenna. However, when the antenna is downsized, it is easily interfered by other electronic components or metal components on the circuit board, and easily causes deterioration of radiation characteristics. In order to solve the problem, a clearance area is disposed on the circuit board to reduce the interference degree, but when the clearance area is disposed on the circuit board, the configuration space of other electronic components is compressed, and therefore, the size of the circuit board is often increased to place the electronic components, so that the size of the module cannot be effectively reduced as a whole.

In view of the above, how to effectively improve the structure of the chip antenna so as to maintain good performance while reducing the size thereof has become an object of the related art.

Disclosure of Invention

In order to solve the above problems, the present invention provides a chip antenna, which can effectively reduce the size by the structural configuration thereof.

According to an embodiment of an aspect of the present invention, a chip antenna is provided, which includes a body, a ground radiation metal and a feed radiation metal, wherein the body includes a first surface and a second surface, and the second surface is opposite to the first surface. The grounding radiation metal comprises two longitudinal radiation arms, a transverse radiation arm and at least one coupling hole, the two longitudinal radiation arms are arranged on the first surface at intervals, each longitudinal radiation arm comprises a front end and a tail end, the front end is electrically connected with a grounding wire, the tail end is opposite to the front end, and the transverse radiation arm is connected with the two tail ends. The at least one coupling hole penetrates into the body from the transverse radiating arm to the second surface and comprises a radiating inner wall metal, wherein one end of the radiating inner wall metal is connected with the transverse radiating arm to be used for electrical connection, and the other end of the radiating inner wall metal is not used for electrical connection. The feed radiation metal comprises a feed radiator which is positioned on the first surface and between the two longitudinal radiation arms.

Therefore, the chip antenna can be used as a coupling condition to achieve the purpose of miniaturization through the structural configuration of at least one coupling hole.

According to various embodiments of the chip antenna, the feeding radiation metal further includes a feeding hole penetrating through the body from the feeding radiator toward the second surface and including a feeding inner wall metal, wherein one end of the feeding inner wall metal is connected to the feeding radiator for electrical connection, and the other end of the feeding inner wall metal is electrically connected to a feeding line for electrical connection.

According to various embodiments of the chip antenna, the feeding radiator further includes a leading edge and a trailing edge, the leading edge is adjacent to each of the front ends, and the trailing edge is adjacent to each of the tail ends. Wherein the relationship of D2< (1/2) D1 is satisfied, D1 represents the length from the leading edge to the trailing edge, and D2 represents the length from the leading edge to the feed aperture.

According to various embodiments of the chip antenna, the front end of each longitudinal radiating arm abuts against a front boundary of the first surface, and a distance is kept between the front edge of the feeding radiator and the front boundary.

According to the above embodiments of the chip antenna, the ground radiation metal further includes two ground holes, each of the ground holes penetrates through the body from the front end to the second surface and includes a ground inner wall metal, wherein one end of each of the ground inner wall metals is connected to each of the front ends for electrical connection, and the other end of each of the ground inner wall metals is electrically connected to the ground line for electrical connection.

According to the embodiments of the chip antenna, the antenna further includes a ground pad and a feed-in pad, the ground pad is located on the second surface and connected to the other end of each ground inner wall metal, and the feed-in pad is located on the second surface and connected to the other end of the feed-in inner wall metal.

According to various embodiments of the chip antenna, the chip antenna further includes a fixing pad located on the second surface.

According to various embodiments of the chip antenna, the at least one coupling hole has a blind via structure.

In accordance with various embodiments of the chip antenna described above, the lateral radiating arm is at a distance from a rear boundary of the first surface.

According to various embodiments of the chip antenna, the ground radiating metal includes four coupling holes, and the four coupling holes are arranged along an extending direction of the transverse radiating arm.

Drawings

Fig. 1 is a schematic perspective view of a chip antenna according to an embodiment of the invention;

FIG. 2 shows a schematic cross-sectional view of the chip antenna of the embodiment of FIG. 1 along a section line 2-2;

FIG. 3 shows a schematic top view of a circuit board for providing a chip antenna arrangement of the embodiment of FIG. 1;

FIG. 4 shows an equivalent circuit schematic of the chip antenna of the embodiment of FIG. 1;

FIG. 5 is a graph showing S parameter measurements for the chip antenna of the embodiment of FIG. 1;

FIG. 6 shows a graph of voltage standing wave ratio measurements for the chip antenna of the embodiment of FIG. 1; and

fig. 7 shows a graph of antenna efficiency measurements for the chip antenna of the embodiment of fig. 1.

Wherein the reference numerals are as follows:

10 … chip antenna

100 … body

110 … first surface

120 … second surface

200 … grounded radiating metal

210 … longitudinal radiating arm

211 … front end

220 … transverse radiating arm

230 … coupling hole

231 … radiating inner wall metal

231a, 231b … end

240 … ground hole

241 … grounded inner wall metal

241a, 241b … end

300 … feeding radiant metal

310 … feed radiator

311 … leading edge

312 … trailing edge

320 … feed hole

321 … feeding in inner wall metal

321a, 321b … end

400 … ground pad

500 … feed pad

600 … fixed pad

C1 … input capacitance

C2 … output capacitor

Length D1, D2 …

L1 … input inductor

L2 … output inductor

P1 … circuit board

P11, P12, P13 … connection pads

P14 … metal

X, Y, Z … axle

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. For the purpose of clarity, numerous implementation details are set forth in the following description. However, the reader should understand that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, these implementation details are not necessary. In addition, some conventional structures and elements are shown in simplified schematic form in the drawings for the sake of simplifying the drawings; and repeated elements will likely be referred to using the same reference number or similar reference numbers.

In addition, when an element (or a mechanism or a module, etc.) is "connected," "disposed" or "coupled" to another element, it can be directly connected, disposed or coupled to the other element, or it can be indirectly connected, disposed or coupled to the other element, that is, there are other elements between the element and the other element. When an element is explicitly connected, directly disposed, or directly coupled to another element, it is intended that no other element is interposed between the element and the other element. The terms first, second, third, etc. are used merely to describe various elements or components, but the elements/components themselves are not limited, so that the first element/component can be also referred to as the second element/component. And the combination of elements/components/mechanisms/modules herein is not a commonly known, conventional or existing combination in the art, and cannot be readily determined by one of ordinary skill in the art based on whether the elements/components/mechanisms/modules themselves are present.

Referring to fig. 1 and fig. 2, in which fig. 1 is a schematic perspective view of a chip antenna 10 according to an embodiment of the invention, and fig. 2 is a schematic cross-sectional view of the chip antenna 10 along a section line 2-2 in the embodiment of fig. 1. The chip antenna 10 includes a body 100, a ground radiation metal 200, and a feed radiation metal 300, wherein the body 100 includes a first surface 110 and a second surface 120, and the second surface 120 is opposite to the first surface 110. The ground radiation metal 200 includes two longitudinal radiation arms 210, a transverse radiation arm 220 and at least one coupling hole 230, the two longitudinal radiation arms 210 are disposed on the first surface 110 at intervals, each longitudinal radiation arm 210 includes a front end 211 and a tail end (not labeled), the front end 211 is electrically connected to a ground line (not shown), the tail end is opposite to the front end 211, and the transverse radiation arm 220 is connected to the two tail ends. The at least one coupling hole 230 penetrates the body 100 from the lateral radiating arm 220 toward the second surface 120 and includes a radiating inner wall metal 231, wherein one end 231a of the radiating inner wall metal 231 is connected to the lateral radiating arm 220 for electrical connection, and the other end 231b of the radiating inner wall metal 231 is not used for electrical connection. The feeding radiation metal 300 includes a feeding radiator 310 located on the first surface 110 and between the two longitudinal radiation arms 210.

Therefore, the chip antenna 10 can be miniaturized by using the structural configuration of at least one coupling hole 230 as a coupling condition. Details of the chip antenna 10 will be described later.

The body 100 may be made of a dielectric material and have a rectangular structure, and the body 100 may be formed by combining a plurality of dielectric layers, and the size of the body 100 may be, for example, but not limited to, 10(mm) × 3.6(mm) × 3.3 (mm). The longitudinal radiating arm 210, the transverse radiating arm 220 and the feeding radiator 310 may be formed on the first surface 110 of the body 100 by exposure, development and etching, or formed on the first surface 110 by silk-screen printing, electroplating or pasting, and the processes of this part are the key points of the prior art and are not described in detail herein.

An extending direction of the longitudinal radiating arms 210 is parallel to the Y-axis direction, and an outer edge (not labeled) of each longitudinal radiating arm 210 is aligned with the side boundary of the first surface 110. An extending direction of the transversal radiating arm 220 is parallel to the X-axis direction, and the transversal radiating arm 220 is connected to the end of each longitudinal radiating arm 210, and is connected to the two longitudinal radiating arms 210 to form an n-shape with a notch, and the feeding radiator 310 is located in the notch. It should be noted that, the longitudinal radiating arm 210 and the transverse radiating arm 220 are actually integrally connected, so there is no boundary therebetween, and only for describing the shape and structure of the ground radiating metal 200 more clearly, the portion of the ground radiating metal 200 on the first surface 110 is divided into the longitudinal radiating arm 210 and the transverse radiating arm 220, which is not limited by the present invention.

The coupling hole 230 is formed by VIA formation, and the coupling hole 230 may have a blind hole structure, i.e., the coupling hole 230 does not penetrate through the body 100 and is spaced from the second surface 120 by a distance, which may be, for example, but not limited to, 0.4 mm. In the manufacturing stage, a blind via structure penetrating from the first surface 110 to the inside of the body 100 along a Z-axis direction is formed on the body 100, the aperture width may be, for example, but not limited to, 1mm, and then the radiation inner wall metal 231 is plated on the inner wall of the blind via structure, so that one end 231a of the radiation inner wall metal 231 is electrically connected to the lateral radiation arm 220. In the embodiments of fig. 1 to 2, the ground radiation metal 200 may include four coupling holes 230, the four coupling holes 230 may be arranged along the extending direction of the lateral radiation arm 220, that is, the four coupling holes 230 are arranged along the X-axis direction, and the four coupling holes 230 may be arranged equidistantly on the lateral radiation arm 220.

The ground radiation metal 200 further includes two ground holes 240, each of the ground holes 240 penetrates the body 100 from the front end 211 toward the second surface 120 and includes a ground inner wall metal 241, wherein one end 241a of each of the ground inner wall metals 241 is connected to each of the front ends 211 for electrical connection, and the other end 241b of each of the ground inner wall metals 241 is electrically connected to the ground line for electrical connection, so that the ground radiation metal 200 can be electrically connected to the ground line through the ground hole 240. In detail, each grounding hole 240 is also formed by VIA formation, and the aperture width thereof can be, for example, but not limited to, 1mm, unlike the coupling hole 230, in that the grounding hole 240 penetrates through the body 100. In other words, the length of the ground hole 240 in the Z-axis direction is greater than the length of the coupling hole 230 in the Z-axis direction.

Similarly, the feeding radiation metal 300 may further include a feeding hole 320 penetrating the body 100 from the feeding radiator 310 toward the second surface 120 and including a feeding inner wall metal 321, wherein one end 321a of the feeding inner wall metal 321 is connected to the feeding radiator 310 for electrical connection, and the other end 321b of the feeding inner wall metal 321 is electrically connected to a feeding line (not shown) for electrical connection.

The feed radiator 310 may further include a leading edge 311 and a trailing edge 312, the leading edge 311 being adjacent to each front end 211, the trailing edge 312 being adjacent to each end. The feed radiator 310 satisfies the relationship of D2< (1/2) D1, where D1 represents the length from the leading edge 311 to the trailing edge 312, and D2 represents the length from the leading edge 311 to the feed hole 320. More specifically, an extending direction of the feed radiator 310 is parallel to the Y-axis direction, the feed hole 320 is connected to the first half section of the feed radiator 310, and D2 is more specifically a length from the leading edge 311 to the center line of the feed hole 320.

As shown in fig. 1 to 2, the front end 211 of each longitudinal radiating arm 210 can abut against a front boundary (not labeled) of the first surface 110, and the front edge 311 of the feed radiator 310 keeps a distance from the front boundary. The lateral radiating arm 220 is spaced from a rear boundary (not labeled) of the first surface 110.

Referring to fig. 3 and fig. 1 to 2 together, fig. 3 is a schematic top view of a circuit board P1 provided for the chip antenna 10 of the embodiment of fig. 1. The chip antenna 10 can be disposed on the circuit board P1, and therefore, the chip antenna 10 can further include a ground pad 400 and a feed pad 500, the ground pad 400 is disposed on the second surface 120 and connected to the other end 241b of each grounding inner wall metal 241, and the feed pad 500 is disposed on the second surface 120 and connected to the other end 321b of the feed inner wall metal 321. The formation of the ground pad 400 and the feed pad 500 is conventional and will not be described in detail, and the chip antenna 10 can be electrically connected to the circuit board P1 more conveniently through the ground pad 400 and the feed pad 500.

In addition, in order to connect the chip antenna 10 and the circuit board P1 more firmly, the chip antenna 10 may further include a fixing pad 600 located on the second surface 120 and far away from the ground pad 400, so as to prevent the chip antenna 10 from being separated from the circuit board P1.

Therefore, the circuit board P1 may be correspondingly provided with connection pads P11, P12, P13 for respectively connecting the ground pad 400, the feed pad 500 and the fixed pad 600, wherein the connection pad P11 corresponds to the ground pad 400, the connection pad P12 corresponds to the feed pad 500, the connection pad P13 corresponds to the fixed pad 600, and the other surface of the circuit board P1 may be fully covered with the metal P14. Therefore, the chip antenna 10 can increase its applicability without requiring a clearance area. It should be noted that, for simplicity, the circuit board P1 is not drawn for electrical connection, and the circuit board P1 may be a multi-layer combination, which should not limit the present invention.

Referring to fig. 4, in which fig. 4 shows an equivalent circuit diagram of the chip antenna 10 in the embodiment of fig. 1, the feeding radiation metal 300 may be equivalent to an input capacitor C1 and an input inductor L1, and the grounding radiation metal 200 may be equivalent to an output capacitor C2 and an output inductor L2, so that the size of the chip antenna 10 can be effectively reduced, and the area can be reduced by shortening the feeding to achieve the required antenna efficiency.

Referring to fig. 5, fig. 6 and fig. 7, wherein fig. 5 shows a graph of S parameter measurement results of the chip antenna 10 of the embodiment of fig. 1, fig. 6 shows a graph of voltage standing wave ratio measurement results of the chip antenna 10 of the embodiment of fig. 1, and fig. 7 shows a graph of antenna efficiency measurement results of the chip antenna 10 of the embodiment of fig. 1. As shown in FIG. 5, when the chip antenna 10 is operated at about 2.4GHz to 2.5GHz, the maximum return loss (return loss) of the chip antenna 10 is-8 dB; as shown in fig. 6, the chip antenna 10 has a maximum Voltage Standing Wave Ratio (VSWR) of 2.3: 1; as can be seen from fig. 7, the average efficiency of the chip antenna 10 was 50%, and the average gain of the chip antenna 10 was-3.5 dBi. Therefore, the chip antenna 10 can still have good performance with a reduced size.

Although the present invention has been described with reference to the above 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.

Claims

1. A chip antenna, comprising:

a body, comprising:

a first surface; and

a second surface opposite to the first surface; a ground-radiating metal, comprising:

two longitudinal radiating arms, set up in this first surface at interval, each this longitudinal radiating arm contains:

the front end is electrically connected with a grounding wire; and

a distal end opposite the front end;

a transverse radiating arm connected to the two ends; and

at least one coupling hole penetrating into the body from the transverse radiating arm toward the second surface and comprising a radiating inner wall metal, wherein one end of the radiating inner wall metal is connected to the transverse radiating arm for electrical connection, and the other end of the radiating inner wall metal is not used for electrical connection; and a feed radiation metal comprising:

a feed radiator located on the first surface and between the two longitudinal radiating arms.

2. The chip antenna according to claim 1, wherein the feed radiating metal further comprises:

and the feed-in hole penetrates through the body from the feed-in radiator to the second surface and comprises feed-in inner wall metal, wherein one end of the feed-in inner wall metal is connected to the feed-in radiator to be used as electric connection, and the other end of the feed-in inner wall metal is electrically connected to a feed-in line to be used as electric connection.

3. The chip antenna according to claim 2, wherein the feed radiator comprises:

a leading edge adjacent each of the front ends; and

a trailing edge adjacent each of the ends;

wherein, the relation of D2< (1/2) D1 is satisfied, D1 represents the length from the leading edge to the trailing edge, and D2 represents the length from the leading edge to the feed hole.

4. The chip antenna according to claim 3, wherein the front end of each of the longitudinal radiating arms abuts against a front boundary of the first surface, and the front edge of the feeding radiator is spaced apart from the front boundary.

5. The chip antenna according to claim 2, wherein the ground radiating metal further comprises:

and each grounding hole penetrates through the body from the front end to the second surface and comprises a grounding inner wall metal, wherein one end of each grounding inner wall metal is connected to each front end to be used as electrical connection, and the other end of each grounding inner wall metal is electrically connected to the grounding wire to be used as electrical connection.

6. The chip antenna according to claim 5, further comprising:

a grounding welding pad which is positioned on the second surface and is connected with the other end of each grounding inner wall metal; and

a feed-in welding pad located on the second surface and connected to the other end of the feed-in inner wall metal.

7. The chip antenna according to claim 6, further comprising:

a fixed pad on the second surface.

8. The chip antenna according to claim 5, wherein the at least one coupling hole has a blind via structure.

9. The chip antenna according to claim 1, wherein the lateral radiating arm is spaced from a rear boundary of the first surface.

10. The chip antenna according to claim 1, wherein the ground radiating metal comprises four coupling holes, the four coupling holes being arranged along an extending direction of the lateral radiating arm.