TWI725642B - Multi-band antenna - Google Patents

Abstract

A multi-band antenna includes a grounding conductor, a first radiation component and a second radiation component. The radiation component includes a first radiation portion, a second radiation portion and a feeding portion which is configured to connect a signal source. The second radiation component includes a third radiation portion, a fourth radiation portion, and a first grounding portion. The length of the third radiating portion or the fourth radiating portion is greater than the first radiation portion and the second radiation portion. The third radiation portion or the fourth radiation portion is radiatively coupled to the first radiation portion and the second radiation portion.

Description

Multi-frequency antenna

The present invention relates to an antenna, especially an antenna suitable for multiple frequency bands.

At present, the application of communication technology in various fields has become more extensive, and the development of communication technology has become increasingly mature.

In order to achieve richer and more versatile communication technologies, antennas need to be suitable for signals of different frequency bands. However, the space of the communication device equipped with the antenna is limited. If multiple antennas are installed in the limited space of the same communication device at the same time, it is necessary to design to reduce the space occupied by the antenna.

Therefore, how to reduce the space occupied by the antenna and ensure that the antenna is suitable for different frequency bands is a problem that the industry urgently wants to invest in research and development resources to solve.

In view of this, an object of the present invention is to provide a multi-frequency antenna that can solve the above-mentioned problems.

In order to achieve the above objective, according to an embodiment of the present invention, a multi-frequency antenna including a ground conductor, a first radiator, and a second radiator is disclosed. The grounding conductor has a grounding function. The first radiator includes a first radiating part, a second radiating part and a feeding part, wherein the feeding part is configured to be connected to a signal source. The second radiator includes a third radiating part, a fourth radiating part and a first grounding part. The length of the third radiating part or the fourth radiating part is greater than that of the first radiating part and the second radiating part, and the third radiating part or the fourth radiating part The radiating part is radiatively coupled with the first radiating part and the second radiating part.

In the embodiment of the present invention, the distance between the third radiating portion or the fourth radiating portion and the first radiating portion and the second radiating portion is less than or equal to 2 mm.

In the embodiment of the present invention, the multi-frequency antenna may further include a third radiator configured to radiately couple the first radiating part or the second radiating part.

In the embodiment of the present invention, the distance between the first radiating part or the second radiating part and the fifth radiating part is less than or equal to 5 mm.

In the embodiment of the present invention, the second radiator may further include an inductance unit, and the inductance unit is disposed in one of the third radiating part or the fourth radiating part.

In the embodiment of the present invention, the inductor unit is a distributed inductor.

In the embodiment of the present invention, the distributed inductor is formed by wires with a wire diameter less than or equal to 0.5 mm.

In the embodiment of the present invention, the wire is generally wound into a rectangular, circular, elliptical or triangular shape.

In summary, the multi-band antenna of the present invention is radiatively coupled to each other through the configuration relationship of the first radiator, the second radiator, and the third radiator to achieve the effect of adding additional radiation paths, thereby making the present invention more versatile. The frequency antenna can be applied to multiple frequency bands. In addition, the present invention can adjust the space occupied by the antenna through the design of the inductance unit, thereby helping to meet the demand for miniaturization of the communication device.

The above description is only used to illustrate the problem to be solved by the present invention, the technical means to solve the problem, and the effects produced by it, etc. The specific details of the present invention will be described in detail in the following embodiments and related drawings.

Hereinafter, a plurality of embodiments of the present invention will be disclosed in drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings.

Please refer to Fig. 1, which is an equivalent schematic diagram of an embodiment of the present invention. Among them, the multi-frequency antenna 100 of the present invention includes a ground conductor 110, a first radiator 120 and a second radiator 130. The ground conductor 110 has a grounding function. The first radiator 120 includes a first radiating part 121, a second radiating part 123 and a feeding part 125. The feeding part 125 is configured to be connected to the signal source 160, and the signal source 160 is configured to feed a signal into the feeding part 125. The second radiator 130 includes a third radiating portion 131, a fourth radiating portion 133 and a first grounding portion 135. The length of the third radiating portion 131 or the fourth radiating portion 133 is greater than the length of the first radiating portion 121 and the length of the second radiating portion 123, and the third radiating portion 131 or the fourth radiating portion 133 and the first radiating portion 121 and the second radiating portion The two radiating parts 123 are radiatively coupled.

The "radiation coupling" in the present invention refers to the generation of a signal path from the feed-in signal to the coupling point and to the ground when the radiating part approaches other objects (usually conductors).

Please refer to FIG. 1. Specifically, the first radiator 120 and the second radiator 130 are disposed on one side of the ground conductor 110. The first radiator 120 further includes a first free end 121a and a second free end 123a. One end of the first radiator 120 coupled to the signal source 160 is the feeding portion 125. The first radiator 120 extends toward both sides of the feeding portion 125, and its two ends away from the feeding portion 125 are a first free end 121a and a second free end 123a, wherein the first free end 121a to the feeding portion 125 and the second free end 123a All the feeding parts 125 need to pass through the first turning point 125a to turn. The first radiating portion 121 is defined by the first free end 121 a to the feeding portion 125. The second radiating portion 123 is defined by the second free end 123a to the feeding portion 125. The first radiator 120 includes a first radiating portion 121 and a second radiating portion 123, so it is roughly T-shaped.

Please refer to FIG. 1. Specifically, the second radiator 130 further includes a third free end 131a and a fourth free end 133a. One end of the second radiator 130 coupled to the ground conductor 110 is the first ground portion 135. The second radiator 130 extends toward both sides of the first grounding portion 135, and its two ends away from the first grounding portion 135 are a third free end 131a and a fourth free end 133a. From the third free end 131a to the feeding portion 125 and the fourth free end 133a to the feeding portion 125, all need to pass through the second turning point 135a to turn. The third radiating portion 131 is defined by the third free end 131 a to the first ground portion 135, and the fourth radiating portion 133 is defined by the fourth free end 133 a to the first ground portion 135. The second radiator 130 includes a third radiating portion 131 and a fourth radiating portion 133, so it is roughly T-shaped.

The length of the third radiating portion 131 or the fourth radiating portion 133 is greater than that of the first radiating portion 121 and the second radiating portion 123, specifically referring to the length from the first grounding portion 135 to the third free end 131a or the first grounding portion The length from 135 to the fourth free end 133a is greater than the length from the feeding portion 125 to the first free end 121a and the length from the feeding portion 125 to the second free end 123a. In other words, the radiation path of the third radiation part 131 or the fourth radiation part 133 is larger than the radiation path of the first radiation part 121 and the second radiation part 123. The present invention is not limited to this, and the length of the third radiating portion 131 and the length of the fourth radiating portion 133 are both greater than the length of the first radiating portion 121 and the length of the second radiating portion 123, that is, the third radiating portion The radiation paths of the portion 131 and the fourth radiation portion 133 are both larger than the radiation paths of the first radiation portion 121 and the second radiation portion 123.

In this embodiment, the first radiator 120 may be disposed in the area formed by the third radiating portion 131, that is, within the range formed by the third free end 131 a to the first ground portion 135. The first radiator 120 may also be disposed in the area formed by the fourth radiating portion 133, that is, within the range formed by the fourth free end 133a to the first ground portion 135.

In this embodiment, the distance between the third radiating portion 131 or the fourth radiating portion 133 and the first radiating portion 121 and the second radiating portion 123 is less than or equal to 2 mm to achieve a better radiation coupling effect. . Specifically, it means that the distance between the first free end 121a to the second free end 123a in the first radiator 120 and the third free end 131a to the second turning point 135a in the second radiator 130 is less than or equal to 2. Mm; or, the distance between the first free end 121a to the second free end 123a of the first radiator 120 and the fourth free end 133a to the second turning point 135a of the second radiator 130 is less than or equal to 2 mm .

In another embodiment of the present invention, the multi-frequency antenna 100 further includes a third radiator 140. The third radiator 140 includes a second ground portion 143 and a fifth radiator 141, wherein the length of the fifth radiator 141 is smaller than that of the first radiator. The length of a radiating portion 121 or the second radiating portion 123, and the first radiating portion 121 or the second radiating portion 123 and the fifth radiating portion 141 are radiatively coupled.

Please refer to FIG. 1. Specifically, the first radiator 120, the second radiator 130 and the third radiator 140 are disposed on one side of the ground conductor 110. The third radiator 140 further includes a fifth free end 141a. One end of the third radiator 140 coupled to the ground conductor 110 is the second ground portion 143, and the end of the third radiator 140 away from the second ground portion 143 is the fifth free end 141a. The second grounding portion 143 to the fifth free end 141a need to pass through the third turning point 143a, and the fifth radiating portion 141 is defined by the second grounding portion 143 to the fifth free end 141a, so the fifth radiating portion 141 and the third radiating The body 140 is substantially L-shaped.

The length of the fifth radiating portion 141 is smaller than that of the first radiating portion 121 or the second radiating portion 123. Specifically, the length from the second ground portion 143 to the fifth free end 141a is smaller than the length from the feeding portion 125 to the first free end 121a or the length from the feeding portion 125 to the second free end 123a. That is, the radiation path of the fifth radiation part 141 is smaller than the radiation path of the first radiation part 121 or the second radiation part 123. It may also be that the length of the fifth radiating portion 141 is smaller than the length of the first radiating portion 121 and the second radiating portion 123, that is, the radiation path of the fifth radiating portion 141 is smaller than that of the first radiating portion 121 and the second radiating portion 123. The radiation path of the person, the present invention is not limited by this.

In this embodiment, the third radiator 140 may be disposed in the area formed by the first radiating portion 121, that is to say, the third radiator 140 is disposed in the range formed by the first free end 121a to the feeding portion 125. Within. The third radiator 140 may also be arranged in the area formed by the second radiating portion 123, that is, within the range formed by the second free end 123a to the feeding portion 125. The user can make adjustments according to the desired radiation path, and the present invention is not limited by this.

In this embodiment, the distance between the fifth radiating portion 141 and the first radiating portion 121 or the second radiating portion 123 is less than or equal to 5 mm to achieve a better radiation coupling effect. Specifically, it refers to the portion from the first free end 121a to the first turning point 125a and the portion from the fifth free end 141a to the third turning point 143a, the distance between which is less than or equal to 5 mm; or, the second free end 123a to the third turning point 143a. The distance between the first turning point 125a and the fifth free end 141a to the third turning point 143a is less than or equal to 5 mm.

Please refer to FIG. 1, in the embodiment of the present invention, the second radiator 130 further includes an inductance unit 137, wherein the inductance unit 137 and the first radiator 120 are respectively disposed on both sides of the first ground portion 135.

With the arrangement of the inductance unit 137, the length of the radiating part can be reduced. Specifically, when the inductance unit 137 is disposed between the third free end 131a and the second turning point 135a, the distance from the third free end 131a to the second turning point 135a can be reduced while still having the same radiation path. When the inductance unit 137 is disposed between the fourth free end 133a and the second turning point 135a, the distance from the fourth free end 133a to the second turning point 135a can be reduced while still having the same radiation path. In addition, with the arrangement of distributed inductors, the multi-frequency antenna 100 can add additional radiation paths, thereby achieving the effect of being suitable for multi-frequency bands and miniaturization.

Specifically, the inductance unit 137 is a distributed inductor, which is formed by a wire with a wire diameter less than or equal to 0.5 mm. The wire is coupled to the third radiating portion 131 or the fourth radiating portion 133, wherein the wire coupled to the wire is divided into two sections, and the two separated sections are respectively coupled to both ends of the wire. Among them, the wires will be wound to form a distributed inductance, but the wires will not overlap or interlace.

In this embodiment, the wire is wound roughly into a rectangle, but the present invention is not limited to this, and the wire can also be wound into a circle, an ellipse, or a triangle. Taking the rectangular shape as an example, the shape of the wire wound will extend toward the ground conductor 110. Specifically, the two ends of the wire coupled to the radiating part first extend toward the ground conductor 110, then turn 90 degrees in the same direction and extend, then turn 90 degrees and extend away from the ground conductor 110, and then turn 90 degrees. The angle extends toward the direction where the wire is coupled to the radiating part and is connected to form a closed loop, but the present invention is not limited to this.

Please refer to Figure 2. Figure 2 is a comparison diagram of the return loss of the multi-frequency antenna 100 in the embodiment shown in Figure 1. It is obvious from the curve S1 that the multi-frequency antenna 100 is suitable for multiple frequency bands, and it can be seen that the curve S1 has Obviously eight different wave troughs represent that the multi-frequency antenna 100 has eight resonant frequency points. Therefore, the present invention can meet the requirements of being applicable to different frequency bands.

In summary, the multi-band antenna of the present invention is radiatively coupled to each other through the configuration relationship of the first radiator, the second radiator, and the third radiator to achieve the effect of adding additional radiation paths, thereby making the present invention more versatile. The frequency antenna can be applied to multiple frequency bands. In addition, the present invention can adjust the space occupied by the antenna through the design of the inductance unit, thereby helping to meet the demand for miniaturization of the communication device.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with the art will not depart from the present invention. Within the spirit and scope, various changes and modifications can be made. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100: Multi-frequency antenna 110: Grounding conductor 120: The first radiator 121: First Radiation Department 121a: first free end 123: Second Radiation Department 123a: second free end 125: Infeed 125a: the first turning point 130: second radiator 131: Third Radiation Department 131a: third free end 133: Fourth Radiation Department 133a: fourth free end 135: The first grounding part 135a: The second turning point 137: Inductance unit 140: Third Radiator 141: Fifth Radiation Department 141a: Fifth free end 143: The second ground part 143a: The third turning point 160: signal source S1: Curve

Figure 1 is an equivalent schematic diagram of a multi-frequency antenna according to an embodiment of the present invention. Fig. 2 is a comparison diagram of the return loss of the multi-frequency antenna in the embodiment shown in Fig. 1.

100: Multi-frequency antenna

110: Grounding conductor

120: The first radiator

121: First Radiation Department

121a: first free end

123: Second Radiation Department

123a: second free end

125: Infeed

125a: the first turning point

130: second radiator

131: Third Radiation Department

131a: third free end

133: Fourth Radiation Department

133a: fourth free end

135: The first grounding part

135a: The second turning point

137: Inductance unit

140: Third Radiator

141: Fifth Radiation Department

141a: Fifth free end

143: The second ground part

143a: The third turning point

160: signal source

Claims (7)

A multi-frequency antenna, including: a grounding conductor with a grounding function; a first radiator, including a first radiating part, a second radiating part, and a feeding part, wherein the feeding part is configured to be connected to a signal source; The second radiator includes a third radiating part, a fourth radiating part, a first grounding part and a distributed inductor, wherein the length of the third radiating part or the fourth radiating part is greater than that of the first radiating part and The second radiating portion, the third radiating portion or the fourth radiating portion are radiatively coupled with the first radiating portion and the second radiating portion, and the distributed inductor is disposed on the third radiating portion or the fourth radiating portion One of; and a third radiator, including a second grounding portion and a fifth radiating portion, wherein the length of the fifth radiating portion is smaller than the first radiating portion and the second radiating portion, and the first radiating Part or the second radiating part and the fifth radiating part are radiatively coupled. The multi-frequency antenna according to claim 1, wherein the distance between the third radiating portion or the fourth radiating portion and the first radiating portion and the second radiating portion is less than or equal to 2 mm. The multi-frequency antenna according to claim 1, wherein the first radiator and the second radiator are substantially T-shaped. The multi-frequency antenna according to claim 3, wherein the distance between the first radiating portion or the second radiating portion and the fifth radiating portion is less than or equal to 5 mm. The multi-frequency antenna according to claim 3, wherein the third radiating part is substantially L-shaped. The multi-frequency antenna according to claim 1, wherein the distributed inductor is formed by a wire with a wire diameter less than or equal to 0.5 mm. The multi-frequency antenna according to claim 6, wherein the wire is generally wound into a rectangular, circular, elliptical, or triangular shape.

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