CN104681993A - Antenna device - Google Patents

Abstract

An antenna device includes a radiation sheet, a ground layer, a dielectric layer and a parasitic antenna. The dielectric layer is disposed between the radiation sheet and the ground layer, the radiation sheet and the ground layer are parallel to each other, and the parasitic antenna is connected to the ground layer and is perpendicular to the ground layer. The present invention improves the radiation pattern of the antenna and enhances the communication quality of electronic products using the antenna device by setting the parasitic antenna on the ground layer with the extension direction parallel to the normal direction of the ground layer.

Description

Antenna device

【Technical field】

The present invention relates to an antenna device, and in particular to an antenna device capable of improving the radiation pattern.

【Background technique】

With the improvement of communication technology, the application of wireless communication technology in technological products is also increasing day by day, making related communication products increasingly diversified, such as mobile phones (Cell Phone), personal digital assistants (Personal Digital Assistant, PDA) with wireless Internet access. ), Global Positioning System (Global Positioning System, GPS), etc., all belong to the category of wireless communication. Moreover, in recent years, consumers have higher and higher requirements for the functions of communication products, so many communication products with different designs and functions are constantly being proposed, and computer network products with wireless communication are a hot trend recently.

As far as wireless communication products are concerned, the most important key in their design is the design of the antenna, because the quality of the antenna design will affect the quality of communication. For example, antennas include non-built-in and built-in types. Non-built-in antennas include monopole antennas, dipole antennas, and helix antennas, while built-in antennas include Planar Inverted F Antennas (PIFA) ) and microstrip antenna (microstrip antenna), among which the planar inverted F antenna is widely used in communication products.

The traditional wireless communication technology mainly uses the patch antenna (Patch Antenna) to achieve the Broadside Radiation Pattern (Broadside Radiation Pattern). However, due to the large space required by the flat-panel antenna, it cannot be used in miniaturized communication products. Therefore, the planar inverted-F antenna is generally used to reduce the size of the antenna. However, the radiation pattern of the planar inverted-F antenna is easily affected by the surrounding objects. Influenced, and then the distribution of its radiation field is limited.

【Content of invention】

The invention provides an antenna device which can improve the radiation pattern of the antenna.

The antenna device of the present invention includes a radiation sheet, a ground layer, a dielectric layer and a parasitic antenna. The radiation sheet is used to receive or transmit radio frequency signals. The ground plane is used for grounding. The dielectric layer is disposed between the radiation sheet and the ground layer, wherein the radiation sheet and the ground layer are parallel to each other. The parasitic antenna is connected to the ground plane, and the extension direction of the parasitic antenna is parallel to the normal direction of the ground plane.

In an embodiment of the present invention, the above-mentioned radiation sheet further includes a feed-in portion and a short-circuit portion. The above-mentioned feed-in point is located on the feed-in part, and the feed-in part has a feed-in point, and the radiation sheet is electrically connected to the feed-in line through the feed-in part. The short circuit portion is electrically connected to the ground layer.

In an embodiment of the present invention, the above-mentioned radiation sheet has slots, so that the radiation sheet forms a C-shaped pattern, and the opening of the C-shaped pattern is adjacent to the feed-in portion and the short-circuit portion.

In an embodiment of the present invention, the aforementioned parasitic antenna is disposed beside the opening of the C-shaped pattern.

In an embodiment of the present invention, the above-mentioned C-shaped pattern has a long axis and a short axis, and the opening of the C-shaped pattern is disposed close to the short axis and close to one side of the feed-in portion and the short-circuit portion.

In an embodiment of the present invention, the length of the above-mentioned C-shaped pattern is a multiple of a quarter of the length of the wavelength of the frequency transmitted or received by the antenna device.

In an embodiment of the present invention, the above-mentioned antenna device is a planar inverted-F antenna.

In an embodiment of the present invention, the above-mentioned radiation sheet has a feed-in point.

In an embodiment of the present invention, the above-mentioned geometric shapes of the radiation sheet include rectangle, triangle, circle and ellipse.

In an embodiment of the present invention, the above-mentioned parasitic antenna is disposed outside the projection area of the radiation sheet on the ground layer.

In an embodiment of the present invention, the aforementioned antenna device is a planar antenna.

In an embodiment of the present invention, the length of the above-mentioned parasitic antenna is a multiple of 1/4 of the wavelength length of the frequency transmitted or received by the antenna device.

In an embodiment of the present invention, the above ground layer is located on the printed circuit board.

Compared with the prior art, the present invention improves the radiation pattern of the antenna and enhances the communication quality of electronic products using the antenna device by setting the parasitic antenna on the ground layer with the extension direction parallel to the normal direction of the ground layer.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

【Description of drawings】

FIG. 1 is a schematic side view of an antenna device according to an embodiment of the present invention.

FIG. 2 is a schematic side view of an antenna device according to another embodiment of the present invention.

FIG. 3 is a schematic oblique view of the antenna device of the embodiment shown in FIG. 2 .

4 and 5 are schematic diagrams of a notebook computer provided with an antenna device according to an embodiment of the present invention.

FIG. 6 is a schematic oblique view of an antenna device according to another embodiment of the present invention.

FIG. 7 is a schematic oblique view of an antenna device according to another embodiment of the present invention.

【Detailed ways】

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 1 is a schematic side view of an antenna device according to an embodiment of the present invention. Referring to FIG. 1 , the antenna device 100 includes a radiation sheet 102 , a ground layer 104 , a dielectric layer 106 and a parasitic antenna 108 . The dielectric layer 106 is disposed between the radiation sheet 102 and the ground layer 104 , and the radiation sheet 102 and the ground layer 104 are parallel to each other. The radiating sheet 102 can be made of a metal sheet or a sheet with a metal plated surface, which is used for receiving a radio frequency signal or emitting a radio frequency signal. The ground layer 104 can be, for example, a ground metal sheet or a ground plane on a printed circuit board, which is used for grounding.

In addition, the parasitic antenna 108 is connected to the ground layer 104, and the parasitic antenna 108 is arranged outside the projection area of the radiation sheet 102 on the ground layer 104, and the extension direction of the parasitic antenna 108 is parallel to the normal direction of the ground layer 104, wherein the parasitic antenna The length of 108 is a multiple of a quarter of the length of the wavelength of the frequency transmitted or received by the antenna device 100 . In this way, by disposing the parasitic antenna 108 perpendicular to the ground layer 104 on the ground layer 104, the radiation pattern generated by the antenna device 100 can be concentrated upwards, that is, even if the signals radiated by the antenna device 100 are also directed toward The extension direction of the parasitic antenna 108 improves the communication quality of electronic products using the antenna device 100 .

FIG. 2 is a schematic side view of an antenna device according to another embodiment of the present invention. FIG. 3 is a schematic oblique view of the antenna device of the embodiment shown in FIG. 2 . As shown in Fig. 2 and Fig. 3, in the present embodiment, the antenna device 200 is a patch antenna (patch antenna), and the radiation piece 202 is a rectangular metal sheet or a metal plated sheet on the surface. There is a feed point FI. The feed-in point FI can be connected to one end of a feed-in line (not shown), and the other end of the feed-in line is connected to a signal source (not shown), so that the signal source can feed the signal into the to the feeding point FI, and then transmit the signal in the form of electromagnetic waves through the radiation sheet 202 . When the feed-in line is a coaxial cable, one end of the core conductor for signal transmission can be connected to the feed-in point FI, and one end of the outer conductor for signal shielding can be connected to the ground layer 104 .

It should be noted that although this embodiment uses the rectangular radiation sheet 202 as an example for illustration, the shape of the radiation sheet 202 is not limited to this. In some embodiments, the radiation sheet 202 can also be other geometric figures. , such as rectangles, triangles, circles, ellipses...etc. In addition, the position of the feed-in point FI is not limited to the position shown in FIG. 2 , and the designer can change the position of the feed-in point FI according to actual application requirements.

In addition, the parasitic antenna 108 is not limited to the vertical formation 104, and the parasitic antenna 108 can also be configured as an adjustable antenna. 4 and 5 are schematic diagrams of a notebook computer provided with an antenna device according to an embodiment of the present invention. The notebook computer 250 in FIG. 4 includes an upper cover 251 and a lower cover 252, wherein the upper cover 251 has a display surface 251A. In this embodiment, the antenna device 200 is arranged on the upper cover 251, and the angle of the parasitic antenna 108 can be adjusted as shown in FIG. 4 The direction shown is towards the z-axis, that is, the direction parallel to the planar extension of the upper cover 251 , so as to obtain better signal transmission. It should be noted that the angle of the parasitic antenna 108 is not limited thereto, and the angle of the parasitic antenna 108 can be within the angle range between the normal line of the upper cover 251 and the plane of the upper cover 251 . Referring to FIG. 5 again, when the upper cover 251 is folded on the lower cover 252 and the display surface 251A faces outward, the parasitic antenna 108 will be shielded by other components of the notebook computer 250 arranged on the lower cover 252 and lose its function. The communication direction is the direction facing the radiation sheet 202, that is, the receiving direction is still the z-axis direction.

FIG. 6 is a schematic oblique view of an antenna device according to another embodiment of the present invention. The antenna device 200 in Fig. 6 is a planar inverted F antenna (planar inverted Fantenna), and the radiation piece 302 except having the part parallel to the ground layer 104, it also includes the feeding part 302A extending toward the ground layer 104 direction and Short circuit part 302B. The short circuit part 302B is electrically connected to the ground layer 104, and the feed-in part 302A has a feed-in point FI, which is used to connect to a feed-in line (not shown) to receive a signal from a signal source (not shown), and It conducts to the radiation sheet 302 parallel to the ground layer 104, and transmits the signal in the form of electromagnetic waves. The radiation sheet 302 parallel to the ground layer 104 has a slot OP, so that the radiation sheet 302 parallel to the ground layer 104 presents a C-shaped pattern, and the opening of the C-shaped pattern is adjacent to the feed-in portion 302A and the short-circuit portion 302B.

As shown in FIG. 6 , the C-shaped pattern of the radiation sheet 302 has a long axis X and a short axis Y, and the opening of the C-shaped pattern is close to the short axis Y and close to the feed-in portion 302A and the short-circuit portion 302B. In addition, the parasitic antenna 108 is disposed next to the opening of the C-shaped pattern, so that the radiation pattern generated by the antenna device 300 is focused upward, thereby improving the communication quality of electronic products using the antenna device 300 . Wherein the length of the parasitic antenna 108 is a multiple of 1/4 of the wavelength length of the frequency transmitted or received by the antenna device 300, and the length of the C-shaped pattern (the dashed line length as shown in Figure 6) is also the transmission or reception frequency of the antenna device 300. A multiple of one quarter of the wavelength length of the received frequency.

It should be noted that the opening of the above-mentioned C-shaped pattern is not limited to the position shown in the embodiment shown in FIG. It is arranged in different positions depending on the position of the opening of the type pattern. In addition, the C-shaped pattern is not limited to have major and minor axes. For example, the C-shaped pattern can also be approximated as a pie pattern with openings.

In some embodiments, the pattern of the radiation sheet 302 parallel to the ground layer 104 may not even be limited to the above-mentioned C-shaped pattern, and the designer may design the required antenna pattern according to the actual application situation. By arranging the parasitic antenna 108 perpendicular to the ground layer 104 on the ground layer 104 , the field pattern of the antenna device can be improved, making it concentrated upward, thereby improving the communication quality of the electronic product using the antenna device.

It should be noted that the implementation of the above parasitic antenna 108 of the antenna device 200 is only an exemplary embodiment, and it is not limited that the parasitic antenna 108 must be completely perpendicular to the ground layer 104 in practical application. For example, FIG. 7 is a schematic oblique view of an antenna device according to another embodiment of the present invention. Please refer to FIG. 7 , the difference between the antenna device 400 of this embodiment and the antenna device 200 is that the parasitic antenna 108 includes a vertical portion 108A, a first extension portion 108B, and a second extension portion 108C, and the total length of the parasitic antenna 108 is still A multiple of a quarter of the wavelength length of the frequency transmitted or received by the antenna device 400 . The vertical portion 108A and the first extension portion 108B are located on the first side S1 of the radiation sheet 202 , one end of the vertical portion 108A is connected to the ground layer 104 , and the extension direction of the vertical portion 108A is parallel to the normal direction of the ground layer 104 . One end of the first extension part 108B is connected to the other end of the vertical part 108A, and the extension direction of the first extension part 108B is parallel to the first side S1 of the radiation sheet 202 and the ground layer 104, wherein the first extension part 108B and the first side S1 form a The angle between the plane of the radiating sheet 202 and the plane of the radiating sheet 202 is between 15° and 80°, and the horizontal distance between the first extension 108B and the first side of the radiating sheet 202 is a first length t1, the range of the first length t1 It is substantially distributed between 1 and 3 mm. In addition, the second extension portion 108C is connected to the other end of the first extension portion 108B, the extension direction of the second extension portion 108C is parallel to the second side S2 of the radiation sheet 202 , and the second extension portion 108C is connected to the second side S2 of the radiation sheet 202 The horizontal distance between them is a second length t2, and the range of the second length t2 is substantially distributed between 1 mm and 3 mm. In addition, the total length of the vertical portion 108A, the first extension portion 108B and the second extension portion 108C is greater than or equal to one-eighth of the wavelength length of the frequency transmitted or received by the antenna device 300 . Moreover, in some embodiments, the shapes of the first extension portion 108B and the second extension portion 108C are not limited to this embodiment. In some embodiments, the first extension portion 108B and the second extension portion 108C can also be in other shapes and extend directly above the parallel radiation sheet 202 to modify the radiation pattern of the antenna device 400 .

To sum up, the present invention improves the radiation pattern of the antenna and enhances the communication quality of the electronic product using the antenna device by setting the parasitic antenna on the ground layer with the extension direction parallel to the normal direction of the ground layer.

Claims (17)

1. An antenna device, characterized in that the device comprises: A radiation sheet for receiving or emitting a radio frequency signal; a ground layer for grounding; a dielectric layer disposed between the radiation sheet and the ground layer, wherein the radiation sheet and the ground layer are parallel to each other; A parasitic antenna is connected to the ground layer, and the extension direction of the parasitic antenna is parallel to the normal direction of the ground layer. 2. The antenna device according to claim 1, wherein the radiation sheet further comprises: a feed-in part having a feed-in point, and the radiation sheet is electrically connected to a feed-in line through the feed-in part; A short circuit portion is electrically connected to the ground layer. 3. The antenna device according to claim 2, wherein the radiation sheet has a slot, so that the radiation sheet forms a C-shaped pattern, and the opening of the C-shaped pattern is adjacent to the feed-in portion and the short circuit department. 4. The antenna device according to claim 3, wherein the parasitic antenna is disposed beside the opening of the C-shaped pattern. 5. The antenna device according to claim 3, wherein the C-shaped pattern has a long axis and a short axis, and the opening of the C-shaped pattern is disposed close to the short axis, and close to the feed-in portion and the short circuit position on one side of the head. 6 . The antenna device according to claim 3 , wherein the length of the C-shaped pattern is a multiple of a quarter of the length of the wavelength of the frequency transmitted or received by the antenna device. 7. The antenna device according to claim 2, wherein the antenna device is a planar inverted-F antenna. 8. The antenna device according to claim 1, wherein the radiation piece has a feeding point. 9 . The antenna device according to claim 1 , wherein the geometric shape of the radiation piece includes a rectangle, a triangle, a circle and an ellipse. 10 . The antenna device according to claim 9 , wherein the parasitic antenna is disposed outside the projected area of the radiation piece on the ground layer. 11 . 11. The antenna device according to claim 9, wherein the antenna device is a panel antenna. 12 . The antenna device according to claim 1 , wherein the length of the parasitic antenna is a multiple of a quarter of the length of the wavelength of the frequency transmitted or received by the antenna device. 13 . 13. The antenna device according to claim 1, wherein the ground layer is located on a printed circuit board or a ground metal sheet. 14. The antenna device according to claim 1, wherein the parasitic antenna further comprises: a vertical portion, one end of which is connected to the ground layer, and the extension direction of the vertical portion is parallel to the normal direction of the ground layer; A first extension part, one end of which is connected to the other end of the vertical part, the extension direction of the first extension part is parallel to the first side of the radiation sheet and the ground layer, and the first extension part is connected to the first side of the radiation sheet the horizontal distance between the sides is a first length; and A second extension part, connected to the other end of the first extension part, the extension direction of the second extension part is parallel to the second side of the radiation sheet, and the distance between the second extension part and the second side of the radiation sheet Horizontal distance—second length. 15. The antenna device according to claim 14, wherein the first length is substantially distributed in a range of 1 to 3 mm. 16. The antenna device according to claim 14, wherein the second length is substantially distributed in a range of 1 to 3 mm. 17. The antenna device according to claim 14, wherein the total length of the vertical part, the first extension part and the second extension part is greater than or equal to eighth of the wavelength length of the frequency transmitted or received by the antenna device one.