TWI769323B - Dual-band antenna - Google Patents

Abstract

A dual-band antenna includes a first radiation part and a second radiation part. The first radiation part includes a first main block, a first and a second extension part, a first and a second bending part. The first extension part and the second extension part are connected to one side of the first main block. The first and the second bending part is connected separately to an end of the first and the second extension part thereof opposite the end that is connected to the first main block. The second radiation part includes a second main block, a connecting part and a matching part. The first main block disposed adjacent to the second main part by a first gap, the connecting part disposed adjacent to the first main block by a second gap, and the second main block disposed adjacent to the second extension part by a third gap.

Description

Dual frequency antenna

The present invention relates to a dual-frequency antenna, especially a kind of small area, small space, low cost, independent design, can be used on a substrate of insulating material (such as a printed circuit board), and can easily adjust the resonance mode of the antenna. frequency to achieve the desired frequency band of the wireless local area network system dual-band antenna.

In today's era of rapid technological development, antennas of various sizes or types have been developed to be applied in handheld electronic devices (such as mobile phones or notebook computers) or wireless transmission devices (USB Dongle , Wireless LAN Card or AP). For example, printed antennas that are light in structure, have good transmission performance and can be easily installed on the inner wall of handheld electronic devices already exist, and are widely used in wireless transmission of various handheld electronic devices, notebook computers or in a wireless communication device.

However, conventional antennas have many nasty shortcomings. For example, the conventional dual-band antenna is large in area, occupies a large space, has a high cost, requires an additional lower ground, and is limited by the limitation that it must be connected to the system ground, so it is not suitable for increasingly miniaturized electronic devices.

According to this, how to have a small area, small space, low cost, independent design, can be used on a substrate of insulating material (such as a printed circuit board), can easily adjust the frequency of the antenna resonance mode, in order to achieve wireless The "dual-band antenna" of the frequency band required by the local area network system is an urgent problem to be solved by those skilled in the related art.

In one embodiment, the present invention provides a dual-band antenna, comprising: a first radiating portion, made of conductive material, comprising: a first main body area; a first extension portion connected to the first main body area one side of the block; a second extension part connected to the side of the first main body block on which the first extension part is provided, and the first extension part extending in different directions, the second extension part and the first extension part extending in different directions An included angle is formed between the extension parts; a first turning part is connected to the other end of the first extension part opposite to the first main body block, and the length direction of the first turning part and the first extension part are connected The length direction of the second turning part is different from the length direction of the second turning part, the length direction of the second turning part is different from the length direction of the second extending part. and a second radiating portion, which is a conductive material, comprising: a second main body block; a connecting portion connected to one side of the second main body block; a matching portion connected to the opposite side of the connecting portion on the other side where the second main body block is provided; the first main body block and the second main body block are arranged adjacent to each other with a first distance, and the connection part is adjacent to the first main body block The second main body block and the second extension part are adjacently arranged with a second distance therebetween, and the first main body block is welded to the welding section of a signal line. One end is used as the feed-in signal end; the other end of the welding section is welded to the second main body block, and the other end is used as the feed-in signal ground end.

The various embodiments of the present disclosure will be described in detail below, and the drawings will be used as examples. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and any easy substitutions, modifications, and equivalent changes of any of the embodiments are included within the scope of the present application, and the subsequent patent scope is allow. In the description of the specification, numerous specific details are provided in order to provide the reader with a more complete understanding of the present invention; however, the present invention may be practiced without some or all of these specific details. Also, well-known steps or elements have not been described in detail to avoid unnecessarily limiting the invention. The same or similar elements in the drawings will be represented by the same or similar symbols. It should be noted that the drawings are for illustrative purposes only, and do not represent the actual size or number of elements unless otherwise specified.

Please refer to FIG. 1 as an embodiment of the dual-frequency antenna 1 provided by the present invention, which mainly includes a first radiating part 10 and a second radiating part 20, which are used as two radiating branches in a dipole antenna structure. The first radiating portion 10 and the second radiating portion 20 are made of conductive material, such as metal sheets, or, for example, the first radiating portion 10 and the second radiating portion 20 can be printed on a substrate of an insulating material (such as a printed circuit board) on the same side and are two metal patterns separated from each other. FIG. 1 shows an embodiment structure in which the first radiating portion 10 and the second radiating portion 20 are two metal sheets.

The first radiating portion 10 includes a first main body block 11 , a first extending portion 12 , a second extending portion 13 , a first turning portion 14 and a second turning portion 15 ; the first extending portion 12 is connected to the first extending portion 12 . One side of the main body block 11 ; the second extension part 13 is connected to the side of the first main body block 11 where the first extension part 12 is provided, and extends in different directions from the first extension part 12 , and the second extension part 13 There is an included angle θ1 with the first extension portion 12 , and the included angle θ1 is approximately 90 degrees. The first turning portion 14 is connected to the other end of the first extending portion 12 opposite to the first main body block 11. The length direction of the first turning portion 14 is different from the length direction of the first extending portion 12. For example, the first turning portion The length direction of the portion 14 and the length direction of the first extension portion 12 form an included angle θ2 of approximately 90 degrees; the second turning portion 15 is connected to the other end of the second extension portion 13 relative to the first main body block 11, and The length directions of the two turning portions 15 are different from the length directions of the second extending portions 13 .

The function of the second radiating part 20 is to ground and match. The second radiating part 20 includes a second radiating part 20 including a second main body block 21 , a connecting part 22 and a matching part 23 ; the connecting part 22 is connected and disposed on one side of the second main body block 21 ; the matching part 23 is connected It is disposed on the other side of the connecting portion 22 relative to the second main body block 21 to adjust the impedance matching of the antenna.

The first main body block 11 and the second main body block 21 are disposed adjacent to each other with a first distance G1, the connecting portion 22 and the first main body block 11 are adjacently disposed with a second distance G2, the first The two main body blocks 21 and the second extension portion 13 are adjacently disposed with a third distance G3, and the first main body block 11 is welded to one end 311 of the welding section 31 of a signal line 30 as a feeding signal end; The other end 312 of the segment 31 is welded to the second body block 21 as a grounding end of the incoming signal. The signal line 30 is welded to one end of the second main body block 21 and connected to a signal module. The portion of the welding section 31 spanning the first distance G1 serves as an intermediate isolation layer between the feed-in signal end and the feed-in signal ground end. The dimensions of the first gap G1 , the second gap G2 and the third gap G3 are not limited, and are designed according to actual needs.

The length directions of the first body block 11 , the first extension part 12 , the second turning part 15 , and the second body block 21 are parallel to a first direction F1 , and the length directions of the second extension part 13 and the first turning part 14 parallel to a second direction F2.

The first main body block 11 and the first extension part 12 are used to transmit and receive a signal having a first frequency, and the first frequency has a first wavelength λ1. The total length of the segment 31 from one end 311) and the first extension 12 is the first length L1, and the relationship between the first length L1 and the first wavelength λ1 conforms to the following formula: L1=(λ1)/4; The unit of the value of the length L1 and the unit of the value of the first wavelength λ1 are both centimeters. For example, when the first frequency is 2450MHz, the first wavelength λ1 is 12.2 cm, so the total length (first length L1 ) of the first body 11 and the first extension 12 is 12.2/4=3.05 cm.

The first main body block 11 and the second extension part 13 are used to transmit and receive a signal having a second frequency, and the second frequency has a second wavelength λ2. The total length of the segment 31 from one end 311) and the second extension 13 is the second length L2, and the relationship between the second length L2 and the second wavelength λ2 conforms to the following formula: L2=(λ2)/4; The unit of the value of the length L2 and the unit of the value of the second wavelength λ2 are both centimeters. For example, when the second frequency is 5000MHz, the second wavelength λ2 is 6.0 cm, so the total length (second length L2 ) of the first body 11 and the second extension 13 is 6.0/4=1.5 cm.

The first extending portion 12 has a first width W1, the second turning portion 15 has a second width W2, and a fourth distance G4 is formed between the first extending portion 12 and the second turning portion 15, the first width W1, the second turning portion 15 The relationship between the two widths W2 and the fourth distance G4 conforms to the following formula: G4>(W1+W2)/2; wherein, the units of the values of the first width W1, the second width W2 and the fourth distance G4 are the same. Through this design, it can be ensured that the two paths of the first body block 11 and the first extension part 12 and the first body block 11 and the second extension part 13 form a dual-frequency structure.

It must be noted that, in the embodiment shown in FIG. 1 , the first extending portion 12 is not completely parallel to the first direction F1, but forms an arc with the connecting portion 22 and the matching portion 23, but this design is only an implementation For example, and does not affect the definition of the above-mentioned numerical values, in other words, when defining the first length L1, the second length L2 or the first width W1, the second width W2 and the fourth distance G4 of the present invention, as long as the above formula can be met, that is It is possible that the shapes of the first radiation portion 10 and the second radiation portion 20 are not limited to the drawings. In addition, the lengths of the first turning portion 14 and the second turning portion 15 are not limited, depending on the frequency of practical application.

Please refer to the structure of an embodiment of the dual-band antenna 2 provided by the present invention as shown in FIG. 2. As mentioned above, the first radiating portion 10 and the second radiating portion 20 can be printed on a substrate 40 made of insulating material. A first bare copper area 111 is set on the first body block 11 , and a second bare copper area 211 is set on the second body block 21 , which are respectively welded to the two ends 311 and 312 of the welding section 31 of the signal line 30 , so as to They are respectively used as the feed-in signal terminal and the feed-in signal ground terminal.

Please refer to Figure 3 and Figure 4. The practical application area shown in the figure is generally applicable to wireless systems with dual-band system requirements whose operating frequency band is 11/bg[2400MHz~2500MHz]+11/ac[4900MHz~5850MHz] in the communication device. Figure 3 shows that the minimum return loss can be achieved in the above-mentioned different operating frequency bands (about 2.4GHz, 5.15GHz). Figure 4 shows that the radiation efficiency can be stably maintained in the above-mentioned different operating frequency bands.

It must be noted that the present invention can be adjusted and modified according to the needs of the product to achieve suitable applications. For example, it can be applied to operating frequency bands located at: 802.11a (5150~5850MHz), 802.11b (2400~2500MHz), 802.11g (2400~5800MHz) 2500MHz), 802.11n (2.4GHz or 5GHz Band) system frequency band requirements, or can adjust the frequency band and apply it to other wireless communication system device antenna applications operating in a wide frequency band.

To sum up, the dual-band antenna provided by the present invention has a small area, a small footprint, and an independent design, which can be used on a substrate of insulating material (such as a printed circuit board), and can easily adjust the resonance mode of the antenna. Compared with the conventional dual-band antenna, the present invention reduces the width by more than 25-50%, which can greatly save the material cost of the printed antenna and reduce the area of the antenna. At the same time, the efficiency of the antenna is not reduced. In addition, the present invention can avoid the mold cost and assembly cost of the stereoscopic antenna and the risk of easy deformation of the stereoscopic antenna.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

1, 2: Dual frequency antenna 10: First radiation part 11: First body block 111: First bare copper area 12: First extension part 13: Second extension part 14: First turning part 15: Second turning Part 20: Second radiation part 21: Second body block 211: Second bare copper area 22: Connection part 23: Matching part 30: Signal line 31: Soldering section 311, 312: Two ends 40: Substrate F1: First Direction F2: Second direction G1: First spacing G2: Second spacing G3: Third spacing G4: Fourth spacing W1: First width W2: Second width θ1, θ2, θ3: included angle

FIG. 1 is a schematic structural diagram of an embodiment of the present invention. FIG. 2 is a schematic diagram of the structure printed on the substrate according to the embodiment of FIG. 1 . FIG. 3 is a table of the antenna reflection loss of the embodiment of FIG. 1 . FIG. 4 is a diagram of the radiation efficiency of the antenna of the embodiment of FIG. 1 .

none

1: Dual frequency antenna

10: The first radiation department

11: The first main body block

12: The first extension

13: Second extension

14: The first turning point

15: The second turning point

20: Second Radiation Department

21: The second main body block

22: Connection part

23: Matching Department

30: Signal line

31: Welding segment

311, 312: two ends

F1: first direction

F2: Second direction

G1: first pitch

G2: Second Gap

G3: Third Gap

G4: Fourth Gap

W1: first width

W2: Second width

θ 1, θ 2, θ 3: included angle

Claims (9)

A dual-frequency antenna, comprising: a first radiating part, made of conductive material, comprising: a first main body block; a first extension part connected to one side of the first main body block; a second extension a part connected to the side of the first main body block where the first extension part is provided, and the first extension part and the first extension part extend in different directions, and there is an included angle between the second extension part and the first extension part; A first turning portion is connected to the other end of the first extension portion opposite to the first main body block, and the length direction of the first turning portion is different from the length direction of the first extending portion; a second turning portion a part connected to the other end of the second extension part opposite to the first main body block, the length direction of the second turning part is different from the length direction of the second extension part; and a second radiating part, which is The conductive material includes: a second main body block; a connection part connected to one side of the second main body block; a matching part connected to the connection part opposite to the second main body block the other side; the first body block and the second body block are adjacently arranged with a first spacing, and the connecting portion and the first body block are adjacent with a second spacing the second main body block and the second extension part are arranged adjacent to each other with a third distance, and the first main body block is welded connected to one end of a welding section of a signal line, and using the one end as a feeding signal terminal; the other end of the welding section is welded to the second main body block, and using the other end as a grounding terminal for the feeding signal; wherein the first The length direction of the main body block, the first extension part, the second turning part, and the second main body block is parallel to a first direction, and the length direction of the second extension part and the first turning part is parallel to a first direction two directions. The dual-frequency antenna as described in claim 1, wherein the first body block and the first extension are used to transmit and receive a signal having a first frequency, and the first frequency has a first wavelength λ1 , the total length of the first main body block and the first extension is the first length L1, and the relationship between the first length L1 and the first wavelength λ1 conforms to the following formula: L1=(λ1)/4; A main body block and the second extension part are used to transmit and receive a signal with a second frequency, the second frequency has a second wavelength λ2, and the total length of the first main body block and the second extension part is The second length L2, the relationship between the second length L2 and the second wavelength λ2 conforms to the following formula: L2=(λ2)/4; wherein, the unit of the value of the first length L1, the unit of the value of the first wavelength λ1 The unit, the unit of the value of the second length L2, and the unit of the value of the second wavelength λ2 are all centimeters. The dual-band antenna as described in claim 1, wherein the first extending portion has a first width W1, the second turning portion has a second width W2, the first extending portion and the second turning portion There is a fourth distance G4 between them, and the relationship between the first width W1, the second width W2 and the fourth distance G4 conforms to the following formula: G4>(W1+W2)/2; Wherein, the units of the values of the first width W1, the second width W2 and the fourth distance G4 are the same. The dual-band antenna as described in claim 1, wherein the signal wire is welded to one end of the second main body block and connected to a signal module. The dual-band antenna as described in claim 4, wherein the welding section spans the first distance. The dual-band antenna as described in claim 1, wherein the first radiating portion and the second radiating portion are disposed on a substrate made of insulating material. The dual-band antenna as described in claim 1, wherein the included angle between the second extension portion and the first extension portion is approximately 90 degrees. The dual-frequency antenna as described in claim 1, wherein the length direction of the first turning portion and the length direction of the first extension portion form an included angle of approximately 90 degrees. The dual-band antenna as described in claim 1, wherein the length direction of the second turning portion and the length direction of the second extension portion form an included angle of approximately 90 degrees.

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