CN201345415Y - Chip type antenna - Google Patents

Abstract

The utility model provides a chip-type antenna, include: a body having a first surface and a second surface; a microstrip line structure disposed on the first surface and the second surface of the body; and at least one metal sheet arranged in the body and positioned between the first surface and the second surface, wherein the metal sheet is electrically connected with the microstrip line structure. Because the area of the metal sheet is almost the same as that of the first surface or the second surface of the body, the metal sheet can greatly increase the radiation area of the chip-type antenna, so that the chip-type antenna has larger bandwidth and better electrical characteristics.

Description

chip antenna

technical field

The utility model relates to a chip antenna, in particular to a chip antenna with a metal sheet.

Background technique

With the rapid development of the wireless communication industry, most electronic products (such as mobile phones, personal digital assistants, notebook computers, sensing devices, etc.) currently have the function of transmitting signals through wireless communication. The main equipment for transmitting and receiving signals in wireless communication is an antenna (antenna) installed on an electronic product. Therefore, with the development of the wireless communication industry, the demand for antennas is also increasing.

In order to reduce the production cost of the antenna itself and meet the design requirements of light, thin, short, and small electronic products, most of the current electronic products that can communicate wirelessly use a smaller chip antenna (chip antenna) to replace the bulky antenna. Larger conventional antennas (such as rod antennas).

General chip antennas, such as the Ceramic chipantenna proposed by US Patent No. US7,136,021 or the antenna device proposed by US Patent No. US6,222,489, these chip antennas generally appear as a rectangular plate and are made of ceramic materials. made. These chip antennas are provided with a meandering microstrip line (microstrips) as a radiator, and the chip antenna transmits or receives wireless signals through the microstrip line.

Although the chip antenna has the advantage of small size, but also because of the small size, the length of the microstrip line that can be surrounded is limited, so the radiation area of the chip antenna is obviously smaller than that of the traditional antenna. Therefore, the bandwidth of the chip antenna is not large. In order to improve this deficiency, some scholars and manufacturers have proposed some methods, such as changing the way around the microstrip line, so that the chip antenna can wrap more circles of the microstrip line. Or the chip antenna and its manufacturing method proposed in Taiwan Patent Publication No. 518801, which allows part of the microstrip line to protrude from the antenna, thereby increasing the total length of the microstrip line, thereby increasing the bandwidth of the antenna.

However, the above-mentioned improvement method is limited to the increase of the length of the microstrip line or the radiation area, so the improvement of the bandwidth of the antenna is also limited.

Utility model content

The purpose of the utility model is to provide a chip antenna, which increases the area for transmitting and receiving wireless signals through a metal sheet, so that the bandwidth of the chip antenna can be increased accordingly.

In order to achieve the above purpose, the utility model proposes a chip antenna, comprising: a body with a first surface and a second surface;

a microstrip line structure disposed on the first surface and the second surface of the body; and

At least one metal sheet is arranged in the body and between the first surface and the second surface, and the metal sheet is electrically connected to the microstrip line structure.

Compared with the prior art, the utility model has the following beneficial effects:

The area of the metal sheet is almost the same as the area of the first surface or the second surface of the body, so the metal sheet can greatly increase the radiation area of the chip antenna, so that the chip antenna has a larger bandwidth and better performance. electrical characteristics.

Description of drawings

FIG. 1 is a perspective view of the chip antenna of the present invention.

FIG. 2 is a perspective view of another viewing angle of the chip antenna of the present invention.

Fig. 3 is a three-dimensional exploded view of the chip antenna of the present invention.

Fig. 4 is a top view of the chip antenna of the present invention.

FIG. 5 is a schematic diagram of the chip antenna of the present invention disposed on the second circuit board.

FIG. 6 is another schematic diagram of the chip antenna of the present invention disposed on the second circuit board.

FIG. 7 is a perspective view of a second embodiment of the chip antenna of the present invention.

FIG. 8 is an exploded perspective view of the second embodiment of the chip antenna of the present invention.

in,

10 Chip Antennas

11 body

110 first circuit board

111 first surface

112 second surface

12 microstrip line structure

121 The first microstrip line

122 second microstrip line

123 connection hole

13 sheet metal

20 second circuit board

21 Feed into the electrode terminal

22 Connect the electrode terminal

23 Ground electrode terminal

24 metal layers

25 vias

30 coaxial cable

31 inner wire

32 outer wire

Detailed ways

Referring to FIGS. 1 to 3 , the chip antenna 10 of the present invention is shown. The chip antenna 10 includes: a body 11 , a microstrip line structure 12 and a metal sheet 13 .

The main body 11 is composed of three first circuit boards 110. The dimensions of the main body 11 are about 5.4 mm in length, 4.5 mm in width and 1.6 mm in thickness, and the upper two first circuit boards 110 has a thickness of 0.4mm, and the bottommost first circuit board 110 has a thickness of 0.8mm. The material of the first circuit board 110 can be Flame Retardant 4 (FR-4) and other materials.

For the convenience of the following description, the upper surface of the body 11 is defined as a first surface 111, and the lower surface of the body 11 is defined as a second surface 112, and the microstrip line structure 12 is arranged on the first surface 111 and the second surface 112. on two surfaces 112 . The metal sheet 13 is disposed in the body 11 and sandwiched between the two first circuit boards 110 . The area of the metal sheet 13 is slightly smaller than that of the first surface 111 or the second surface 112 . The metal sheet 13 is electrically connected to the microstrip line structure 12, and both (the microstrip line structure 12 and the metal sheet 13) are made of a highly conductive metal material (such as copper). The chip antenna 10 of the present invention uses the microstrip line structure 12 and the metal sheet 13 as radiators to transmit or receive wireless signals.

Referring to FIG. 4 , the microstrip line structure 12 will be described in more detail below.

The microstrip structure 12 has a plurality of first microstrip lines 121 , a plurality of second microstrip lines 122 and a plurality of connection holes 123 . The first microstrip lines 121 are fixed on the first surface 111 , and the first microstrip lines 121 are not directly connected to each other, but have a distance from each other. And the first microstrip line 121 is perpendicular to the long side L of the body 11 (the included angle is 90 degrees).

The second microstrip line 122 is fixed on the second surface 112 and is not directly connected to each other, and the second microstrip line 122 has an angle smaller than 90 degrees with the long side L of the body 11 . From the top view ( FIG. 4 ), except for two ends of each second microstrip line 122 , the remaining part does not overlap with the first microstrip line 121 .

The connection holes 123 are respectively disposed at two ends of each first microstrip line 121 , and the diameter of the connection holes 123 is larger than the line width of the first microstrip line 121 . Each connection hole 123 passes through the body 11 and is connected to one end of the corresponding second microstrip line 122 . Since the connection hole 123 is coated with a metal (not shown), the connection hole 123 can also transmit electrical signals, so that the first microstrip line 121 and the second microstrip line 122 are electrically connected. When the last (lower right) connection hole 123 passes through the body 11 , it also passes through the metal sheet 13 , so that the metal sheet 13 contacts the connection hole 123 to form an electrical connection.

Another characteristic of the connecting holes 123 is that: from the top view ( FIG. 4 ), two adjacent connecting holes 123 are not located at the same vertical position. That is to say, the connection holes 123 are arranged in a staggered manner. This feature allows the first microstrip lines 121 or the second microstrip lines 122 to be arranged more closely, increasing the number of the first microstrip lines 121 or the second microstrip lines 122 .

The above is the description of the characteristics of the microstrip line structure 12 , and how the chip antenna 10 of the present invention transmits and receives wireless signals will be described below. The chip-type antenna 10 of the present utility model transmits and receives wireless signals through the first microstrip line 121, the second microstrip line 122 and the metal sheet 13 as radiators, and the first (lower left) connecting hole 123 is the chip-type The feed point (feed point) of the antenna 10, the signal to be transmitted can be input through the connecting hole 123, and then the signal is passed from the frontmost (leftmost) second microstrip line 122 to the frontmost first microstrip line 121, the frontmost The first microstrip line 121 is then transmitted to the second second microstrip line 122 , and the second second microstrip line 122 is then transmitted to the second first microstrip line 121 .

The signal will be transmitted between the first microstrip line 121 and the second microstrip line 122 in sequence, and when the signal is transmitted to the last second microstrip line 122, it will pass through the second circuit board 20 described later (as shown in Figure 5 ) is transferred to the last (lower right) connection hole 123 and transferred to the metal sheet 13 . During the transmission of the signal, radio waves are generated. Conversely, when the first microstrip line 121, the second microstrip line 122, and the metal sheet 13 receive wireless signals, the received signals will be transmitted to the feed-in point, and then output to other electronic components from the feed-in point (not shown). . The lower right connection hole 123 and the upper right connection hole 123 can also be directly connected with the second microstrip line 122 (not shown), and the signal can be transmitted to the metal sheet 13 without connecting the electrode terminal 22 .

The chip antenna 10 of the present invention greatly increases the radiation area for transmitting and receiving wireless signals through the arrangement of the metal sheet 13 , so the bandwidth of the chip antenna 10 of the present invention can be greatly increased. And by changing the shape of the metal sheet 13, the desired bandwidth and field pattern can be easily adjusted. In addition, the chip antenna 10 of the present invention is a circularly polarized antenna capable of generating an omni-directional field pattern.

Referring to FIG. 5 and FIG. 6 , how the chip antenna 10 of the present invention is disposed on a second circuit board 20 and how to electrically connect with the second circuit board 20 will be described below.

The second circuit board 20 has a feed-in electrode terminal 21, a connection electrode terminal 22, a ground electrode terminal 23, a metal layer 24 and two via holes 25, the feed-in electrode terminal 21, the connection electrode terminal 22, The metal in the ground electrode terminal 23 , the metal layer 24 and the via hole 25 is a highly conductive metal material (such as copper). The feeding electrode terminal 21, connecting electrode terminal 22, and grounding electrode terminal 23 are arranged on the upper surface of the second circuit board 20, the grounding electrode terminal 23 is located at the leftmost end of the second circuit board 20, and the connecting electrode terminal 22 is located at the second circuit board 20. At the rightmost end of the two circuit boards 20 , the feed-in electrode terminal 21 is located between the connection electrode terminal 22 and the ground electrode terminal 23 , and there is a gap between the three. The metal layer 24 is disposed on the lower surface of the second circuit board 20 , and the area of the metal layer 24 is the same as that of the lower surface of the second circuit board 20 . The two through holes 25 are arranged on the upper surface of the second circuit board 20, and are respectively arranged at the upper right corner and the lower right corner of the ground electrode terminal 23, and the two through holes 25 pass through the second circuit board 20 and are connected. to the metal layer 24, and a layer of metal (not shown) is coated in the two via holes 25, so the ground electrode terminal 23 and the metal layer 24 are electrically connected to each other.

When the chip antenna 10 is arranged on the second circuit board 20, the second surface 112 of the chip antenna 10 faces the upper surface of the second circuit board 20, and the frontmost (lower left) connecting hole 123 (feeding point) Welded on the feed-in electrode terminal 21 to be electrically connected to the feed-in electrode terminal 21, the last (lower right) connection hole 123 and the penultimate (upper right) connection hole 123 are welded to the connection electrode terminal 22 to be electrically connected to the connecting electrode terminal 22. The connecting electrode terminal 22 can also transmit signals, and the signal is transmitted from the upper right connection hole 123 to the lower right connection hole 123 . In this way, the signal can be input into the chip antenna 10 through the feeding electrode terminal 21 and then transmitted into radio waves, or the chip antenna 10 can output the wireless signal through the feeding electrode terminal 21 after receiving the wireless signal.

The second circuit board 20 is also connected to a coaxial cable 30, the coaxial cable 30 has an inner conductor (inner conductor) 31 and an outer conductor (outer conductor) 32, and the inner conductor 31 is located on the outer conductor. Layer wire 32 inside. The inner wire 31 is connected and welded to the feeding electrode end 21 , and the outer wire 32 is connected and welded to the ground electrode end 23 . The coaxial cable 30 can transmit a signal to the feeding electrode terminal 21, or receive a signal from the feeding electrode terminal 21, and the coaxial cable 30 uses the grounding electrode terminal 23 and the metal layer 24 as a ground, The metal layer 24 greatly increases the grounding area, thus increasing the antenna efficiency of the chip antenna 10 .

Please refer to Fig. 7 and Fig. 8, the chip antenna 10 of the present invention has a second embodiment, the difference between the second embodiment and the first embodiment is that two metal sheets 13 are arranged in the main body 11 . A metal sheet 13 is sandwiched between every two first circuit boards 110 , and the last (lower right) connection hole 123 runs through the two metal sheets 13 and is electrically connected to the two metal sheets 13 . By adding another piece of metal sheet 13 , the radiation area of the chip antenna 10 can be further increased, so that the chip antenna 10 has a larger bandwidth and better electrical characteristics.

In addition, the chip antenna 10 of the present utility model has a third embodiment (not shown), the difference between the third embodiment and the first and second embodiments is: except for the last connection hole 123 and the metal sheet 13, the rest of the connecting holes 123 can also be electrically connected to the metal sheet 13, thereby increasing the radiation frequency of the chip antenna 10.

Based on the above, the chip antenna 10 of the present invention has the following characteristics:

1. Through the metal sheet 13, the chip antenna 10 of the present invention can greatly increase the radiation area, so that the chip antenna 10 of the present invention has a larger bandwidth, better electrical characteristics, and radiation efficiency.

2. The chip antenna 10 of the present invention is small in size and suitable for use in electronic products with small volumes.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (12)

1. A chip-type antenna, comprising:

a body having a first surface and a second surface;

a microstrip line structure disposed on the first surface and the second surface of the body; and

at least one metal sheet is arranged in the body and positioned between the first surface and the second surface, and the metal sheet is electrically connected with the microstrip line structure.

2. The chip-type antenna according to claim 1, wherein the microstrip line structure has a plurality of first microstrip lines, a plurality of second microstrip lines and a plurality of connection holes, the first microstrip lines are fixed on the first surface, the second microstrip lines are fixed on the second surface, the connection holes communicate with the first surface and the second surface of the body, and the first microstrip lines are electrically connected to at least one of the second microstrip lines through at least one of the connection holes.

3. The chip-type antenna as claimed in claim 2, wherein at least one of the connection holes is electrically connected to at least one of the metal plates.

4. The chip-type antenna as claimed in claim 2, wherein the connection hole at the extreme end is electrically connected to at least one of the metal sheets.

5. The chip-type antenna according to claim 2, wherein said connection holes are arranged in a staggered manner.

6. The chip-type antenna according to claim 2, disposed on a circuit board.

7. The chip-type antenna according to claim 6, wherein the circuit board has a feeding electrode terminal, the feeding electrode terminal is located on the upper surface of the circuit board, and the microstrip line structure is electrically connected to the feeding electrode terminal.

8. The chip-type antenna as claimed in claim 7, wherein the connection hole at the foremost end is electrically connected to the feeding electrode terminal.

9. The chip-type antenna according to claim 6, wherein the circuit board has a connection electrode terminal, the connection electrode terminal is located on the upper surface of the circuit board, and the microstrip line structure is electrically connected to the connection electrode terminal.

10. The chip-type antenna as claimed in claim 9, wherein the connection hole at the endmost is electrically connected to the connection electrode terminal.

11. The chip-type antenna as claimed in claim 7, wherein the circuit board has a ground electrode terminal on an upper surface thereof, and a coaxial cable is electrically connected to the feeding electrode terminal and the ground electrode terminal of the circuit board.

12. The chip type antenna according to claim 11, wherein the circuit board has a metal layer and at least one via hole, the metal layer is disposed on a lower surface of the circuit board, and the at least one via hole communicates the ground electrode terminal and the metal layer.

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