CN107346842A - dual frequency antenna - Google Patents

Abstract

The invention discloses a dual-frequency antenna which comprises a substrate, a first group of antennas, an isolation metal sheet and a second group of antennas. The first group of antennas comprises a first planar inverted-F antenna and a second planar inverted-F antenna. The first planar inverted-F antenna includes a first radiating portion and a first grounding portion. The second planar inverted-F antenna includes a second radiation portion and a second grounding portion. The first planar inverted-F antenna and the second planar inverted-F antenna are symmetrical to each other and are arranged on the first surface of the substrate. The isolation metal sheet is coupled between the first grounding part and the second grounding part. The second group of antennas includes a third antenna and a fourth antenna. The third antenna is coupled to the first ground portion. The fourth antenna is coupled to the second ground. The third antenna and the fourth antenna are mutually symmetrical and arranged on the second surface of the substrate. The first set of antennas operates at a first frequency and the second set of antennas operates at a second frequency.

Description

dual frequency antenna

technical field

The present invention relates to an antenna device, and in particular to a dual-frequency antenna.

Background technique

In devices such as handheld electronic devices (such as mobile phones or notebook islands) or wireless transmission devices, lightweight antennas of various sizes are usually used. For example, a planar inverted-F antenna (Planar Inverted-F Antenna, PIFA) or a monopole antenna (Monopole Antenna), which is light in structure, good in transmission performance, and can be easily arranged on the inner wall of a handheld electronic device, is widely used in multi- Wireless transmission of a handheld electronic device or a notebook computer or a wireless communication device. However, in order to reduce the size of the existing dual-band antennas, the distance between the antenna structures is too close to easily generate radiation interference. Therefore, how to provide a method to eliminate radiation interference between antenna structures while maintaining a compact size is one of the problems that the industry wants to solve at present.

Contents of the invention

According to an embodiment of the present invention, a dual-band antenna is provided. The dual-band antenna includes a substrate, a first group of antennas, an isolated metal sheet and a second group of antennas. The substrate has a first surface and a second surface parallel to each other. The first group of antennas is arranged on the first surface of the substrate. The first group of antennas includes a first planar inverted-F antenna and a second planar inverted-F antenna. The first planar inverted-F antenna includes a first radiation part and a first ground part. The first radiating portion is coupled to the first grounding portion, and the first grounding portion has a first feeding end and a first grounding end. The second planar inverted-F antenna includes a second radiating portion and a second grounding portion, the second radiating portion is coupled to the second grounding portion, and the second grounding portion has a second feeding end and a second grounding end. Wherein the first planar inverted-F antenna and the second planar inverted-F antenna are symmetrical to each other and are arranged on the first surface of the substrate. The isolated metal sheet is coupled between the first ground portion of the first planar inverted-F antenna and the second ground portion of the second planar inverted-F antenna. The second group of antennas is arranged on the second surface of the substrate. The second group of antennas includes a third antenna and a fourth antenna. The third antenna includes a third radiating part and a first feed connection part, and the first feed connection part is coupled to the first ground part of the first planar inverted-F antenna. The fourth antenna includes a fourth radiating portion and a second feeding connection portion, and the second feeding connection portion is coupled to the second ground portion of the second planar inverted-F antenna. Wherein the third antenna and the fourth antenna are symmetrical to each other and are arranged on the second surface of the substrate. The first planar inverted-F antenna and the second planar inverted-F antenna operate at a first frequency, the third antenna and the fourth antenna operate at a second frequency, and the first frequency is greater than the second frequency.

Description of drawings

FIG. 1 is a schematic diagram of a dual-frequency antenna 100 according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a dual-frequency antenna 200 according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of a dual-frequency antenna 300 according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of a dual-frequency antenna 400 according to another embodiment of the present invention;

FIG. 5 is a schematic diagram of a dual-frequency antenna 500 according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of a dual-frequency antenna 600 according to another embodiment of the present invention;

FIG. 7 is a schematic diagram of a dual-frequency antenna 700 according to another embodiment of the present invention;

FIG. 8 is a schematic diagram of a dual-frequency antenna 800 according to another embodiment of the present invention;

FIG. 9 is a schematic diagram of a dual-frequency antenna 900 according to another embodiment of the present invention;

FIG. 10 is a schematic diagram of a dual-frequency antenna 1000 according to another embodiment of the present invention;

FIG. 11 is a schematic diagram of a dual-band antenna 1100 according to another embodiment of the present invention.

Symbol Description

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100: dual-band antenna

110: Substrate

120: The first group of antennas

130: isolated metal sheet

140: The second set of antennas

1202: The first planar inverted-F antenna

1204: Second Planar Inverted-F Antenna

122: The first radiation department

124, 524, 624, 724, 824, 924, 1024, 1124: the first grounding part

126: The second radiation department

128, 528, 628, 727, 828, 928, 1028, 1128: the second grounding part

132: Isolation connection part

134: Isolation extension

1402: Third Antenna

1404: Fourth Antenna

142: Third Radiant Department

144: first feed-in connection part

146: The Fourth Radiant Division

148: Second feed connection part

1321, 1322, 1341, 1342, 1441, 1442, 1481, 1482, 2361, 2362, 2381, 2382: endpoints

A1: the first side

A2: Second side

G1: ground plane

FP1: the first feed end

FP2: Second feed end

GP1: the first ground terminal

GP2: Second ground terminal

d1: Spacing

236, 336, 436: first branch

238, 338, 438: second branch

X1, X2: distance

detailed description

FIG. 1 is a schematic diagram of a dual-band antenna 100 according to an embodiment of the present invention. As shown in FIG. 1 , the dual-band antenna 100 includes a substrate 110 , a first group of antennas 120 , an isolated metal sheet 130 and a second group of antennas 140 . The substrate 110 has a first surface A1 and a second surface A2 parallel to each other. The first group of antennas 120 is disposed on the first surface A1 of the substrate 110 . The first group of antennas 120 includes a first planar inverted-F antenna 1202 and a second planar inverted-F antenna 1204 . The first planar inverted-F antenna 1202 includes a first radiating portion 122 and a first grounding portion 124 . The first radiation part 122 is coupled to the first ground part 124, and the first ground part 124 has a first feed-in terminal FP1 and a first ground terminal GP1. The second planar inverted-F antenna 1204 includes a second radiating portion 126 and a second grounding portion 128, the second radiating portion 126 is coupled to the second grounding portion 128, and the second grounding portion 128 has a second feeding end FP2 and a second ground terminal GP2. The first ground terminal GP1 and the second ground terminal GP2 are coupled to a ground plane G1. The first planar inverted-F antenna 1202 and the second planar inverted-F antenna 1204 are symmetrical to each other and disposed on the first surface A1 of the substrate 110 .

The isolation metal sheet 130 is coupled between the first ground portion 124 of the first planar inverted-F antenna 1202 and the second ground portion 128 of the second planar inverted-F antenna 1204 . The second group of antennas 140 is disposed on the second surface A2 of the substrate 110 . The second group of antennas 140 includes a third antenna 1402 and a fourth antenna 1404 . The third antenna 1402 includes a third radiation portion 142 and a first feeding connection portion 144 , and the first feeding connection portion 144 is coupled to the first ground portion 124 of the first planar inverted-F antenna 1202 . The fourth antenna 1404 includes a fourth radiation portion 146 and a second feeding connection portion 148 , and the second feeding connection portion 148 is coupled to the second ground portion 128 of the second planar inverted-F antenna 1204 .

In this embodiment, the first feed connection portion 146 and the second feed connection portion 148 are, for example, a through hole (Via). The third antenna 1402 and the fourth antenna 1404 are symmetrical to each other and are disposed on the second surface A2 of the substrate 110 . The first planar inverted-F antenna 1202 and the second planar inverted-F antenna 1204 operate at a first frequency, the third antenna 1402 and the fourth antenna 1404 operate at a second frequency, and the first frequency is greater than the second frequency. first frequency.

For example, the first frequency is located in a frequency band of 5 GHz, and the second frequency is located in a frequency band of 2.4 GHz. The isolating metal sheet 130 is used to isolate the radiation between the first planar inverted-F antenna 1202 and a second planar inverted-F antenna 1204 , that is, to adjust the matching and isolation effect of the high frequency part.

In detail, in this embodiment, the isolation metal sheet is, for example, a T-shaped structure. The isolation metal sheet 130 includes an isolation connection portion 132 and an isolation extension portion 134 . The isolation connection part 132 has a first end 1321 and a second end 1322 . The first end 1321 and the second end 1322 of the isolation connection portion are respectively coupled to the first ground portion 124 and the second ground portion 128 . The isolation extension 134 has a first end 1341 and a second end 1342 , and the first end 1341 of the isolation extension is coupled to a midpoint between the first end 1321 and the second end 1322 of the isolation connection portion 132 . The isolation extension portion 134 is perpendicular to the isolation connection portion 132 . The isolation connection portion 132 is parallel to the ground plane G1 with a distance d1. This distance is, for example, no more than 2 mm, or no more than one-tenth of the corresponding wavelength of the first frequency.

In this embodiment, the matching and matching of the high-frequency part antenna (that is, the first planar inverted-F antenna 1202 and the second planar inverted-F antenna 1204) can be adjusted by adjusting the size of the isolation connecting portion 132 and the isolation extension portion 134. isolation effect. For example, the distance from the first ground terminal GP1 to the second end 1342 of the isolation extension 134 via the first end 1321 of the isolation connection portion 132 and the first end 1341 of the isolation extension 134 (as X1 in FIG. 1 ) is equal to the first Frequency (5GHz) corresponds to a quarter of the wavelength. Because the first planar inverted-F antenna 1202 and the second planar inverted-F antenna 1204 are symmetrical to each other, the second ground terminal GP2 reaches the isolation extension through the second end 1322 of the isolation connection part 132 and the first end 1341 of the isolation extension part 134. The distance of the second end 1342 of the portion 134 will also be equal to one quarter of the corresponding wavelength of the first frequency (5 GHz). Therefore, the present invention can adjust the size of the isolation connection portion 132 and the isolation extension portion 134 according to the frequency of the high-frequency part antenna to adjust the matching and isolation effects of the high-frequency part to isolate the first planar inverted-F antenna 1202 and a second planar antenna 1202. Radiation between planar inverted-F antennas 1204.

On the other hand, the first ground part 124 and the second ground part 128 are used to isolate the radiation between the third antenna 1302 and the fourth antenna 1304 respectively, that is, to adjust the matching and isolation effect of the low frequency part.

In detail, the first feed connection part 144 has a first connection end 1441 and a second connection end 1442, the first connection end 1441 is coupled to the first grounding part 124, and the second connection end 1442 is coupled to the third Radiation section 142 . The second feeding connection portion 148 has a first connection end 1481 and a second connection end 1482 , the first connection end 1481 is coupled to the second ground portion 128 , and the second connection end 1482 is coupled to the fourth radiation portion 146 .

In one embodiment, the matching and isolation effects of the low-frequency part antenna (ie, the third antenna 1402 and the fourth antenna 1404 ) can be adjusted by adjusting the size of the first ground portion 124 and the second ground portion 128 . For example, the distance from the first connection end 1441 of the first feed connection portion 144 to the first ground end GP1 along the first ground portion 124 (such as X2 in FIG. 1 ) is a quarter of the corresponding wavelength of the second frequency or an eighth. Because the third antenna 1402 and the fourth antenna 1404 are symmetrical to each other, the distance from the first connection end 1481 of the second feed connection portion 148 to the second ground end GP2 along the second ground portion 128 is also the corresponding wavelength of the second frequency one-fourth or one-eighth of that. Therefore, the present invention can also adjust the size of the first ground portion 124 and the second ground portion 128 according to the frequency of the antenna of the low frequency portion to adjust the matching and isolation effect of the low frequency portion to isolate the third antenna 1402 and the fourth antenna 1404. radiation.

In the present invention, the shape of the isolation metal sheet 130 is not limited. Please refer to FIG. 2 , which is a schematic diagram of a dual-band antenna 200 according to another embodiment of the present invention. In FIG. 2 , for convenience of description, the second group of antennas 140 disposed on the second surface A2 of the substrate 110 is not shown. The difference between the dual-band antenna 200 in FIG. 2 and the dual-band antenna 100 in FIG. 1 is that the isolated metal sheet is an I-shaped structure. The isolation metal sheet 130 further includes a first branch 236 and a second branch 238 . The first branch 236 and the second branch 238 are symmetrical to each other. The first branch 236 has a first end and 2361 a second end 2362 . The first end 2361 of the first branch 236 is coupled to the second end 1342 of the isolation extension 134 . The second branch 238 has a first end 2381 and a second end 2382 . The first end 2381 of the second branch 238 is coupled to the second end 1342 of the isolation extension 134 . Wherein, the distance from the first ground terminal GP1 to the second end 2362 of the first branch 236 via the first end 1321 of the isolation connection portion 132, the first end 1341 of the isolation extension portion 134, and the second end 1342 of the isolation extension portion 134 is equal to The first frequency corresponds to a quarter of a wavelength. Similarly, the distance from the second ground terminal GP2 to the second end 2382 of the second branch 238 via the second end 1322 of the isolation connection portion 132, the first end 1341 of the isolation extension portion 134, and the second end 1342 of the isolation extension portion 134 equal to one quarter of the corresponding wavelength of the first frequency.

As another example, as shown in FIG. 3 , the difference between the dual-band antenna 300 in FIG. 3 and the dual-band antenna 100 in FIG. 1 lies in that the first branch 336 and the second branch 338 included in the isolation metal sheet 130 are mutually symmetrical V-shaped structures. As another example, as shown in FIG. 4 , the difference between the dual-band antenna 400 in FIG. 4 and the dual-band antenna 100 in FIG. 1 lies in that the first branch 436 and the second branch 438 included in the isolation metal sheet 130 each have a bend. Therefore, in the present invention, the shape of the isolated metal sheet 130 is not limited, and the shape or size of the isolated metal sheet 130 can be adjusted according to actual needs to match the first planar inverted-F antenna 1202 and the second planar inverted-F antenna 1204. Match or isolate effect.

Likewise, the present invention does not limit the structure or shape of the first group of antennas 120 . For example, as shown in FIG. 5, the difference between the dual-band antenna 500 in FIG. 5 and the dual-band antenna 100 in FIG. . As another example shown in FIG. 6 , the difference between the dual-band antenna 600 in FIG. 6 and the dual-band antenna 100 in FIG. 1 lies in that the first ground portion 624 and the second ground portion 628 are an arc-shaped inverted U-shaped structure.

Please also refer to FIGS. 7 to 11. The difference between the dual-frequency antenna 700, 800, 900, 1000 and 1100 in FIGS. 7-11 and the dual-frequency antenna 100 in FIG. and 1124 are different from the structures of the second grounding portions 728 , 828 , 928 , 1028 and 1128 . Although not shown in the figure, the present invention does not limit the shape or structure of the first radiation portion 122 . Therefore, the structure or shape of the first group of antennas 120 can be adjusted according to actual needs.

Similarly, although not shown in the figure, the present invention does not limit the structure or shape of the second group of antennas 140 . The second group of antennas 140 can be a single dipole antenna, a planar inverted-F antenna, a three-dimensional antenna or other types of antennas. The second group of antennas is disposed on the second surface A2 of the substrate 110 and is respectively coupled to the first ground portion 124 and the second ground portion 124 of the first planar inverted-F antenna 1202 through the first feed connection portion 144 and the second feed connection portion 148. The second ground portion 128 of the two-plane inverted-F antenna 1204 . Moreover, the position where the first feeding connection portion 144 is coupled to the first ground portion 124 of the first planar inverted-F antenna 1202 is not limited, that is, a through hole ( Via) to couple to the third antenna 1402 . Likewise, a via can be used at any position of the second ground portion 128 to couple to the fourth antenna 1404 .

In summary, the dual-frequency antenna provided by the present invention uses an isolating metal sheet to isolate the radiation between the first planar inverted-F antenna and a second planar inverted-F antenna, so as to adjust the matching of the high-frequency part and have High isolation effect. The dual-frequency antenna further isolates the radiation between the third antenna and the fourth antenna through the first ground part and the second ground part, so as to adjust the matching of the low-frequency part and have a high isolation effect. In addition, the antenna designer can easily adjust the operating frequency of the antenna by changing the structure such as the length or shape of the isolation metal sheet and/or the length or shape of the radiation portion and/or the ground portion. In addition, the dual-frequency antenna provided by the present invention has the advantages of simple structure and light weight, so it can be combined with various communication electronic products according to different application requirements.

In summary, although the present invention has been disclosed in conjunction with the above multiple embodiments, they are not intended to limit the present invention. Those skilled in the art to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (8)

1. a kind of dual-band antenna, comprising：

Substrate, there is one first face and one second face parallel to each other；

First group of antenna, first face of the substrate is arranged on, comprising：

First planar inverted F-shape antenna, include the first irradiation unit and the first grounding parts, first radiation Portion is couple to first grounding parts, and first grounding parts have the first feed side and the first earth terminal；And

Second planar inverted F-shape antenna, include the second irradiation unit and the second grounding parts, second radiation Portion is couple to second grounding parts, and second grounding parts have the second feed side and the second earth terminal；

Wherein first planar inverted F-shape antenna is mutually symmetrical with second planar inverted F-shape antenna and sets Put in first face of the substrate；

Isolating metal piece, it is second flat with this to be coupled in first grounding parts of first planar inverted F-shape antenna Between second grounding parts of face inverted F shaped antenna；And

Second group of antenna, second face of the substrate is arranged on, comprising：

Third antenna, include the 3rd irradiation unit and the first feed-in connecting portion, the first feed-in connecting portion It is couple to first grounding parts of first planar inverted F-shape antenna；And

4th antenna, include the 4th irradiation unit and the second feed-in connecting portion, the second feed-in connecting portion It is couple to second grounding parts of second planar inverted F-shape antenna；

Wherein the third antenna and the 4th antenna it is mutually symmetrical with and be arranged on the substrate this second Face；

Wherein first planar inverted F-shape antenna and second planar inverted F-shape antenna operation is in one first frequency In a second frequency, the first frequency is more than second frequency for rate, the third antenna and the 4th antenna operation Rate.

2. dual-band antenna as claimed in claim 1, wherein the isolating metal piece include：

Isolate connecting portion, there is first end and the second end, the first end and second end be respectively coupled to this One grounding parts and second grounding parts；And

Isolate extension, there is the 3rd end and the 4th end, the 3rd end is couple to being somebody's turn to do for the isolation connecting portion Midpoint between first end and second end, to isolate connecting portion orthogonal with this for the isolation extension.

3. dual-band antenna as claimed in claim 2, wherein first earth terminal is via the isolation connecting portion The first end and the isolation extension the 3rd end to the 4th end of the isolation extension distance Equal to a quarter of the corresponding wavelength of the first frequency, second earth terminal is via the isolation connecting portion Second end and the 3rd end of the isolation extension are to the distance at the 4th end of the isolation extension etc. In a quarter of the corresponding wavelength of the first frequency.

4. dual-band antenna as claimed in claim 2, wherein the isolating metal piece also include：

First branch, has the 5th end and the 6th end, the 5th end be couple to the isolation extension this four End；And

Second branch, there is one the 7th end and one the 8th end, the 7th end is couple to the isolation extension Four end；

Wherein first branch and second branch is mutually symmetrical with, and first earth terminal connects via the isolation 4th end of the first end in portion, the 3rd end of the isolation extension and the isolation extension to this The distance at the 6th end of one branch is equal to a quarter of the corresponding wavelength of the first frequency, and this second connects Ground terminal extends via second end of the isolation connecting portion, the 3rd end of the isolation extension and the isolation The distance at the 4th end in portion to the 8th end of second branch is equal to the corresponding wavelength of the first frequency A quarter.

5. dual-band antenna as claimed in claim 1, wherein the first feed-in connecting portion have one first to connect Connect end and a second connection end, first connection end are couple to first grounding parts, the second connection end coupling The 3rd irradiation unit is connected to, the second feed-in connecting portion has one the 3rd connection end and one the 4th connection end, 3rd connection end is couple to second grounding parts, and the 4th connection end is couple to the 4th irradiation unit, its In distance of first connection end along first grounding parts to first earth terminal for the second frequency The a quarter of corresponding wavelength or 1/8th, the 3rd connection end along second grounding parts to this second The distance of earth terminal is a quarter or 1/8th of the corresponding wavelength of the second frequency.

6. dual-band antenna as claimed in claim 1, wherein the first feed-in connecting portion and second feed-in Connecting portion is respectively a perforation (Via).

7. dual-band antenna as claimed in claim 2, wherein first earth terminal and the second earth terminal coupling A ground plane is connected to, the isolation connecting portion is parallel each other with the ground plane and has a spacing.

8. dual-band antenna as claimed in claim 7, wherein this is smaller than or equal to 2mm.