Single-frequency printed antenna

Abstract

A single-frequency printed antenna includes: a circuit board; the grounding body is arranged on the circuit carrier plate; the circuit carrier plate is provided with an upper side edge, a lower side edge, a left side edge and a right side edge, the upper side edge and the lower side edge are opposite, the left side edge and the right side edge are opposite, and the grounding body extends from the upper right corner of the circuit carrier plate to the right side edge, the lower side edge and the left side edge. The grounding body is provided with a left side edge and a right side edge, the center of the left side edge extends rightwards to form a C shape with an upward opening, and the radiating body extends rightwards from the upper left direction of the grounding body, turns and extends downwards, then enters the C-shaped opening of the grounding body and extends rightwards to the middle of the right portion of the circuit carrier plate, so that a step shape bent twice is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to an antenna, in particular to a printed antenna with small size and stable operation in a single frequency band. BACKGROUND

[0002] In recent years, with the vigorous development of mobile communication, various mobile devices gradually have the trend of wireless, at the same time, people's requirements for mobile devices and peripheral devices are higher and higher, and both of them are expected to develop towards small size. The volume of mobile devices and peripheral devices is getting smaller and smaller. For example, the volume of digital cameras is getting smaller and smaller, so the antenna set in the internal antenna must be reduced accordingly, so the demand for antenna that can work stably in the provided frequency band and small size is increasing.

[0003] Therefore, it is necessary to provide a printed antenna that can work stably in the provided frequency band under the condition of limited space. SUMMARY

[0004] The utility model discloses a single frequency printed antenna, which comprises a circuit carrier plate, a grounding body arranged on the circuit carrier plate, and a radiation body arranged on the circuit carrier plate and isolated from the grounding body. The circuit carrier plate has opposite upper and lower edges and opposite left and right edges. The grounding body extends from the upper right corner of the circuit carrier plate to the right edge, the lower edge and the left edge, and extends rightward from the central position of the left edge to form a C-shaped opening upward. The radiation body extends rightward from the upper left of the grounding body, then bends downward, and then extends rightward to the middle of the right part of the circuit carrier plate after entering the C-shaped opening of the grounding body, forming a two-bend stepped structure.

[0005] In some embodiments, the ground body is provided with a ground end and comprises a first ground portion formed by extending linearly from a right upper corner of the circuit carrier board along the upper side edge to the left, a second ground portion formed by extending linearly from the right upper corner along the right side edge downward, a third ground portion formed by extending linearly from a bottom end of the second ground portion along the lower side edge to the left, a fourth ground portion formed by extending linearly from a left end of the third ground portion along the left side edge upward, and a fifth ground portion formed by extending linearly from a top end of the fourth ground portion to the right, wherein the first, third and fifth ground portions are horizontally long strips, the second and fourth ground portions are vertically long strips, a left end of the first ground portion is spaced apart from the radiator by a first distance, a right upper corner of the third ground portion is cut to form a long strip-shaped notch, and the ground end is located at a left end near the notch, the top end of the fourth ground portion is located at a central position of the left side edge, and a right end of the fifth ground portion is spaced apart from the radiator by a second distance.

[0006] In some embodiments, the radiator is provided with a feed-in end and comprises a first radiation portion formed by extending from near a left upper corner of the circuit carrier board along the upper side edge to the right, a second radiation portion formed by extending linearly from a right end of the first radiation portion downward, a third radiation portion formed by extending linearly from a bottom end of the second radiation portion to the right, and a fourth radiation portion formed by extending linearly from a middle of a lower edge of the third radiation portion downward, wherein the first and third radiation portions are horizontally long strips, the second radiation portion is a vertically long strip, a left end of the first radiation portion is spaced apart from the left side edge by a third distance, and a lower edge of the first radiation portion is spaced apart from an upper edge of the fifth ground portion by a fourth distance, a bottom end of the second radiation portion is spaced apart from the third ground portion by a fifth distance, a right end of the third radiation portion is spaced apart from the second ground portion by a sixth distance, an upper edge of the third radiation portion is spaced apart from a lower edge of the first ground portion by a seventh distance, a lower edge of the fourth radiation portion is spaced apart from the third ground portion by an eighth distance, and the feed-in end is located near the lower edge of a left portion of the fourth radiation portion.

[0007] Another purpose of the present application is to provide an antenna, comprising: a carrier board; a ground body arranged on the carrier board; and a radiator arranged on the carrier board and isolated from the ground body, and wherein the ground body forms a C-shaped opening upward, a right end of the ground body is higher than a left end of the ground body, the radiator forms a Z-shaped structure, a left end of the radiator is higher than the left end of the ground body, the left end of the radiator extends out of the opening of the ground body, and a middle portion and a right end of the radiator are surrounded by the ground body and arranged in the opening of the ground body.

[0008] In summary, the single-frequency printed antenna has the ability to stably work in the provided frequency band in limited space. BRIEF DESCRIPTION OF DRAWINGS

[0009] For the above and other purposes, features, advantages and embodiments of the present application can be better understood by reading the following detailed description in conjunction with the accompanying drawings.

[0010] Figure 1 is a structural diagram of the single-frequency printed antenna of the present application.

[0011] Figure 2 is a voltage standing wave ratio test diagram of the single-frequency printed antenna of the present application.

[0012] Figure 3 is a Smith chart of the single-frequency printed antenna of the present application.

[0013] Figure 4 is a reflection loss diagram of the single-frequency printed antenna of the present application.

[0014] Figure 5 is an efficiency diagram of the single-frequency printed antenna of the present application. DETAILED DESCRIPTION

[0015] To explain the technical content, structural features, purposes and effects of the single-frequency printed antenna of the present application in detail, the following embodiments are illustrated in conjunction with the drawings. For the convenience of explanation, in the present patent specification, the upper side is defined as the higher position in the direction facing the drawing, the lower side is defined as the lower position in the direction facing the drawing, the left side is defined as the left-hand position in the direction facing the drawing, and the right side is defined as the right-hand position in the direction facing the drawing.

[0016] Referring to Figure 1 The single-frequency printed antenna 100 of the present application is a dipole antenna arranged on a circuit carrier 10 of an electronic device (not shown in the drawing), and is composed of a ground body 20 and a radiation body 30, both of which are arranged on the circuit carrier 10. In the present embodiment, the circuit carrier 10 is in the shape of a rectangle, and for the convenience of explanation, the four sides of the circuit carrier 10 are defined as an upper side 11, a lower side 12, a left side 13 and a right side 14, respectively. The ground body 20 and the radiation body 30 are arranged separately on the surface of the circuit carrier 10, and a space is formed between the ground body 20 and the radiation body 30.

[0017] Referring to Figure 1The ground body 20 is formed in a C-shape by extending from the right upper corner of the circuit board 10 to the right side edge 14, the lower side edge 12 and the left side edge 13, and extending from the center of the left side edge 13 to the right.

[0018] In the present embodiment, the ground body 20 includes a first ground portion 21, a second ground portion 22, a third ground portion 23, a fourth ground portion 24 and a fifth ground portion 25. The first ground portion 21, the third ground portion 23 and the fifth ground portion 25 are horizontally long strips, and the second ground portion 22 and the fourth ground portion 24 are vertically long strips. The first ground portion 21 is formed by extending linearly from the right upper corner of the circuit board 10 to the upper side edge 11, and the left end of the first ground portion 21 is spaced apart from the radiator 30 by a first spacing s1. The second ground portion 22 is formed by extending linearly from the right upper corner to the right side edge 14. The third ground portion 23 is formed by extending linearly from the bottom end of the second ground portion 22 to the lower side edge 12, and the right upper corner of the third ground portion 23 is cut to form a long strip-shaped notch 231. The fourth ground portion 24 is formed by extending linearly from the left end of the third ground portion 23 to the upper side edge 11, and the top end of the fourth ground portion 24 is located at the center of the left side edge 13. The fifth ground portion 25 is formed by extending linearly from the top end of the fourth ground portion 24 to the right side edge 14, and the right end of the fifth ground portion 25 is spaced apart from the radiator 30 by a second spacing s2.

[0019] The radiator 30 extends to the right from the left upper corner of the ground body 20, is bent to extend downward, and then extends to the right to the middle of the right portion of the circuit board 10 after entering the C-shaped opening of the ground body 20, thereby forming a two-bend stepped shape.

[0020] Continuing to refer to Figure 1 In the present embodiment, the radiator 30 includes a first radiator portion 31, a second radiator portion 32, a third radiator portion 33 and a fourth radiator portion 34. The first radiator portion 31 and the third radiator portion 33 are horizontally long strips, the second radiator portion 32 is a vertically long strip, and the second radiator portion 32, the third radiator portion 33 and the fourth radiator portion 34 are disposed in the space surrounded by the first ground portion 21, the second ground portion 22, the third ground portion 23, the fourth ground portion 24 and the fifth ground portion 25.

[0021] The first radiation part 31 is formed by extending rightwards along the upper side edge 11 near the upper left corner of the circuit board 10, and the left end of the first radiation part 31 is spaced apart from the left side edge 13 by a third spacing s3, and the lower edge of the first radiation part 31 is spaced apart from the upper edge of the fifth grounding part 25 by a fourth spacing s4. The second radiation part 32 is formed by extending straight downwards from the right end of the first radiation part 31, and the bottom end of the second radiation part 32 is spaced apart from the third grounding part 23 by a fifth spacing s5. The third radiation part 33 is formed by extending straight rightwards from the bottom end of the second radiation part 32, and the right end of the third radiation part 33 is spaced apart from the second grounding part 22 by a sixth spacing s6, and the upper edge of the third radiation part 33 is spaced apart from the lower edge of the first grounding part 21 by a seventh spacing s7. The fourth radiation part 34 is formed by extending straight downwards from the middle of the lower edge of the third radiation part 33, and the lower edge of the fourth radiation part 34 is spaced apart from the third grounding part 23 by an eighth spacing s8.

[0022] In the embodiment, the grounding body 20 is provided with a grounding end 40, and the grounding end 40 is located at the left end of the third grounding part 23 near the notch 231. The radiation body 30 is provided with a feeding end 50, and the feeding end 50 is located at the left part of the fourth radiation part 34 near the lower edge.

[0023] When the single-frequency printed antenna 100 is used for wireless communication, the current is fed in through the feeding end 50, and the current flows through the fourth radiation part 34, and then the third radiation part 33, the second radiation part 32 and the first radiation part 31, and the frequency band that can be oscillated is 2.4GHz to 2.5GHz.

[0024] In the embodiment, the first spacing s1 to the eighth spacing s8 have certain size requirements, so that the first spacing s1 to the eighth spacing s8 have a coupling effect, and the electromagnetic waves of the grounding body 20 and the radiation body 30 can be transmitted or interacted with each other, so as to oscillate the frequency band of 2.4GHz to 2.5GHz. Therefore, the single-frequency printed antenna 100 can stably work in the provided frequency band in a limited space.

[0025] In the implementation, the first spacing s1 is 2mm, the second spacing s2 is 5mm, the third spacing s3 is 1.6mm, the fourth spacing s4 is 2.5mm, the fifth spacing s5 is 1.5mm, the sixth spacing s6 is 1mm, the seventh spacing s7 is 2.5mm, and the eighth spacing s8 is 1mm.

[0026] Please refer to Figure 2 and Figure 3, the voltage standing wave ratio (VSWR) test chart of the single-frequency printed antenna 100 of the utility model and Smith chart. When the utility model single-frequency printed antenna 100 operates at 2.4GHz, the voltage standing wave ratio is 1.2772 (M1 in the figure), when the utility model single-frequency printed antenna 100 operates at 2.44GHz, the voltage standing wave ratio is 1.1558 (M2 in the figure), when the utility model single-frequency printed antenna 100 operates at 2.48GHz, the voltage standing wave ratio is 1.2899 (M3 in the figure). Therefore, the utility model single-frequency printed antenna 100 can stably operate in the frequency range of 2.4GHz to 2.5GHz.

[0027] Please refer to Figure 4 , as Figure 4 indicated, the utility model single-frequency printed antenna 100 operates in the frequency range of 2.4GHz to 2.5GHz, and the reflection loss of its frequency width is approximately within -20dB, which shows that the loss degree of the single-frequency printed antenna 100 is small, and the radiation energy of the printed antenna 30 is large.

[0028] Please refer to Figure 5 , the efficiency chart of the utility model single-frequency printed antenna 100. When the antenna works at different frequencies, the higher the efficiency value converted from the average power, the better the performance of the antenna. In the embodiment, the efficiency of the single-frequency printed antenna 100 in the working frequency range of 2.4GHz to 2.5GHz is approximately 50%, therefore, the utility model single-frequency printed antenna 100 can achieve high efficiency in the working frequency range in limited space, and its efficiency remains at a certain level.

[0029] In summary, the utility model single-frequency printed antenna 100 can stably work in the provided frequency range in limited space, and adapts to the development trend of miniaturization and wireless of electronic products.

[0030] Although the case has been disclosed as above by the embodiment, it is not used to limit the case, anyone with ordinary knowledge in the art can make some changes and decorations without departing from the spirit and scope of the case, therefore, the protection scope of the case shall be subject to the appended claims.

Claims

1. A single frequency printed antenna, characterized by: The application relates to a circuit board, which comprises a circuit board, a grounding body arranged on the circuit board, and a radiation body arranged on the circuit board and separated from the grounding body, wherein the circuit board is provided with opposite upper and lower edges and opposite left and right edges, the grounding body extends from the right upper corner of the circuit board to the right edge, the lower edge and the left edge, and extends rightwards from the central position of the left edge to form a C-shaped opening upwards, and the radiation body extends rightwards from the left upper corner of the grounding body, turns downwards, and then extends rightwards into the middle of the right part of the circuit board after entering the C-shaped opening of the grounding body, thereby forming a two-bend stepped structure.

2. The single-frequency printed antenna of claim 1, wherein: The grounding body is provided with a grounding end, and comprises a first grounding part formed by extending linearly leftwards along the upper edge from the right upper corner of the circuit board, a second grounding part formed by extending linearly downwards along the right edge from the right upper corner, a third grounding part formed by extending linearly leftwards along the lower edge from the bottom end of the second grounding part, a fourth grounding part formed by extending linearly upwards along the left edge from the left end of the third grounding part, and a fifth grounding part formed by extending linearly rightwards from the top end of the fourth grounding part, wherein the first grounding part, the third grounding part and the fifth grounding part are horizontally long strips, the second grounding part and the fourth grounding part are vertically long strips, the left end of the first grounding part is separated from the radiation body by a first spacing, the right upper corner of the third grounding part is cut to form a long-strip-shaped notch, the left end of the grounding end is located near the notch, the top end of the fourth grounding part is located at the central position of the left edge, and the right end of the fifth grounding part is separated from the radiation body by a second spacing.

3. The single-frequency printed antenna of claim 2, wherein: The radiation body is provided with a feeding end, and comprises a first radiation part formed by extending rightwards along the upper edge from near the left upper corner of the circuit board, a second radiation part formed by extending linearly downwards from the right end of the first radiation part, a third radiation part formed by extending linearly rightwards from the bottom end of the second radiation part, and a fourth radiation part formed by extending linearly downwards from the middle of the lower edge of the third radiation part, wherein the first radiation part and the third radiation part are horizontally long strips, the second radiation part is a vertically long strip, the left end of the first radiation part is separated from the left edge by a third spacing, and the lower edge of the first radiation part is separated from the upper edge of the fifth grounding part by a fourth spacing, the bottom end of the second radiation part is separated from the third grounding part by a fifth spacing, the right end of the third radiation part is separated from the second grounding part by a sixth spacing, the upper edge of the third radiation part is separated from the lower edge of the first grounding part by a seventh spacing, the lower edge of the fourth radiation part is separated from the third grounding part by an eighth spacing, and the feeding end is located near the lower edge of the left part of the fourth radiation part.

4. An antenna, characterized by: The application relates to a radiator, comprising: a carrier plate; a grounding body arranged on the carrier plate; and a radiator arranged on the carrier plate and separated from the grounding body, wherein the grounding body forms an open upward C-shaped structure, the right end of the grounding body is higher than the left end of the grounding body, the radiator forms a Z-shaped structure, the left end of the radiator is higher than the left end of the grounding body, the left end of the radiator extends out of the opening of the grounding body, and the middle part and the right end of the radiator are surrounded by the grounding body and arranged in the opening of the grounding body.

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