Single-frequency antenna

Abstract

A single-frequency antenna includes: a circuit board; the first radiating body is arranged on the circuit carrier plate; the first radiator is fixedly connected with the circuit carrier plate, the second radiator is fixedly connected with the first radiator, and the first radiator is of a flat structure attached to the surface of the circuit carrier plate and is provided with a radiation part with a U-shaped extension path, a feed-in end arranged at one end of the radiation part and a grounding end arranged at the other end of the radiation part. The position of the feed-in end is in front of the position of the grounding end, the second radiating body comprises a first radiating arm and a second radiating arm, the first radiating arm is connected to the radiating part close to the feed-in end and extends in the direction perpendicular to the circuit carrier plate, and the second radiating arm is connected to the radiating part close to the grounding end and extends in the direction perpendicular to the circuit carrier plate. And the second radiation arm extends from the tail end of the first radiation arm to a direction parallel to the circuit carrier plate.

Description

Technical Field

[0001] This utility model relates to an antenna, and more particularly to a small-sized antenna that can operate stably. Background Technology

[0002] In recent years, with the rapid development of mobile communications, various mobile devices have gradually become wireless. At the same time, people have increasingly higher requirements for mobile devices and their peripherals, expecting both to become smaller and more portable. For these reasons, the miniaturization of electronic devices necessitates a corresponding reduction in the size of the antennas installed within them, thus increasing the demand for small antennas that can operate stably within their provided frequency bands.

[0003] Therefore, it is necessary to provide an antenna that can operate stably in a given frequency band under limited space conditions. Summary of the Invention

[0004] The purpose of this utility model is to provide a single-frequency antenna, comprising: a circuit board; a first radiator disposed on the circuit board; and a second radiator fixed and connected to the first radiator. The first radiator is a flat structure attached to the surface of the circuit board and has a U-shaped radiating portion, a feed end disposed at one end of the radiating portion, and a ground end disposed at the other end of the radiating portion. The feed end is located in front of the ground end. The second radiator includes a first radiating arm and a second radiating arm. The first radiating arm is connected to the radiating portion near the feed end and extends in a direction perpendicular to the circuit board. The second radiating arm extends from the end of the first radiating arm in a direction parallel to the circuit board.

[0005] In some embodiments, the right end of the radiating portion is positioned in front of the left end of the radiating portion.

[0006] In some embodiments, the width of the first radiating arm extension path is fixed.

[0007] In some embodiments, the intersection of the second radiating arm and the first radiating arm is cut inward to form a notch, and the width of the end of the second radiating arm is greater than the width of the first radiating arm.

[0008] In some embodiments, the width of the first radiating arm is equal to the width of the second radiating arm at the notch.

[0009] Another objective of this invention is to provide a single-frequency antenna, comprising: a circuit board; a first radiator printed on the circuit board; and a second radiator fixed and connected to the first radiator, wherein the first radiator is a planar structure, the second radiator is a three-dimensional structure, the first radiator has a U-shaped radiating portion, the right arm of the U-shaped radiating portion has a ground terminal at its end, the left arm of the U-shaped radiating portion has a feed terminal at its end, the length of the right arm of the U-shaped radiating portion is greater than the length of the left arm of the U-shaped radiating portion, and the width of the right arm of the U-shaped radiating portion is greater than the width of the left arm of the U-shaped radiating portion. The second radiator includes a first radiating arm and a second radiating arm, the first radiating arm is connected to the left arm of the U-shaped radiating portion and extends in a direction perpendicular to the circuit board, and the second radiating arm extends from the end of the first radiating arm in a direction parallel to the circuit board.

[0010] As stated above, the single-frequency antenna of this invention has the ability to operate stably in the provided frequency band within a limited space. Attached Figure Description

[0011] To make the above and other objects, features, advantages and embodiments of this utility model more apparent and understandable, the contents of this case can be better understood when read in conjunction with the accompanying drawings.

[0012] Figure 1 This is a three-dimensional view of the single-frequency antenna of this utility model.

[0013] Figure 2 This is a three-dimensional view of the single-frequency antenna of this utility model from another perspective.

[0014] Figure 3 This is a structural diagram of the two radiators of the single-frequency antenna of this utility model.

[0015] Figure 4 This is the Smith chart of the single-frequency antenna of this utility model.

[0016] Figure 5 This is a reflection loss diagram of the single-frequency antenna of this utility model. Detailed Implementation

[0017] To explain in detail the technical content, structural features, achieved objectives, and effects of this single-frequency antenna, the following embodiments are provided in conjunction with the accompanying drawings. For ease of explanation, in this patent specification, "upper" is defined as a higher position in the direction of the drawing, "lower" is defined as a lower position in the direction of the drawing, "left" is defined as the left-hand position in the direction of the drawing, and "right" is defined as the right-hand position in the direction of the drawing.

[0018] Please see Figure 1The single-frequency antenna 100 of this invention is disposed on a circuit board 10 of an electronic device (not shown in the figure). The single-frequency antenna 100 is a planar inverted-F antenna (PIFA) and consists of a first radiator 20 and a second radiator 30. The first radiator 20 is disposed on the circuit board 10, and the second radiator 30 is fixed and connected to the first radiator 20. In this embodiment, one end of the second radiator 30 is soldered to the first radiator 20.

[0019] Please see again Figures 1 to 3 The first radiator 20 is configured as a flat structure attached to the upper surface of the circuit carrier board 10, and includes a U-shaped radiating part 23, a feed end 21 disposed at one end of the radiating part 23, and a ground end 22 disposed at the other end of the radiating part 23. The U-shaped opening of the radiating part 23 faces forward and the position of the feed end 21 is in front of the position of the ground end 22, such that the position of the right end of the radiating part 23 is forward than the position of the left end of the radiating part 23.

[0020] Continue to refer to Figure 1 The second radiator 30 includes a first radiating arm 31 electrically connected to the radiating portion 23 near the feed end 21, the first radiating arm 31 extending in a direction perpendicular to the circuit carrier 10, and a second radiating arm 32 extending from the end of the first radiating arm 31 in a direction parallel to the circuit carrier 10. The width of the extension path of the first radiating arm 31 is fixed, and a notch 33 is formed inward at the intersection of the second radiating arm 32 and the first radiating arm 31, such that the width of the end of the second radiating arm 32 is greater than the width of the first radiating arm 31. In this embodiment, the width of the first radiating arm 31 is equal to the width of the second radiating arm 32 at the notch 33, and the end of the second radiating arm 32 is suspended.

[0021] When the single-frequency antenna 100 of this invention is used for wireless communication, the current is fed in through the feed terminal 21, flows through the radiating part 23, and then through the first radiating arm 31 and the second radiating arm 32, resulting in a frequency band of 2.4GHz to 2.5GHz. This allows the single-frequency antenna 100 of this invention to operate stably in the provided frequency band within a limited space.

[0022] The single-frequency antenna 100 of this invention forms the first radiating arm 31 and the second radiating arm 32 by bending, thereby reducing the installation space and enabling its application in various electronic devices. Furthermore, to ensure that the single-frequency antenna 100 of this invention has optimal antenna characteristics, the second radiating arm 32 needs to be extended as much as possible without exceeding the installation space. In practice, the length of the second radiating arm 32 is 18.5 mm, the width of the second radiating arm 32 is 2 mm, while the width of the first radiating arm 31 is 0.8 mm.

[0023] Please see Figure 4 The figure shows the Smith chart of the single-frequency antenna 100 of this invention. When the single-frequency antenna 100 operates at 2.45 GHz, it intersects the horizontal axis of the Smith chart (M1 in the figure), indicating that the voltage standing wave ratio (VSWR) of the single-frequency antenna 100 is small at 2.45 GHz. Therefore, the single-frequency antenna 100 of this invention can operate stably in the frequency range of 2.4 GHz to 2.5 GHz.

[0024] Please see again Figure 5 ,like Figure 5 As shown, the single-frequency antenna 100 of this invention operates in the frequency band of 2.4GHz to 2.5GHz, and its bandwidth reflection loss is approximately within -10dB, indicating that the single-frequency antenna 100 has low loss and high radiated energy.

[0025] In summary, the single-frequency antenna 100 of this utility model can operate stably in the provided frequency band under limited space conditions, adapting to the development trend of miniaturization and wirelessization of electronic products.

[0026] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A single-frequency antenna, characterized in that: The device comprises: a circuit board; a first radiator disposed on the circuit board; and a second radiator fixed and connected to the first radiator, wherein the first radiator is a flat structure attached to the surface of the circuit board and has a radiating portion extending in a U-shape, a feed end disposed at one end of the radiating portion, and a ground end disposed at the other end of the radiating portion, wherein the feed end is located in front of the ground end; and the second radiator includes a first radiating arm and a second radiating arm, wherein the first radiating arm is connected to the radiating portion near the feed end and extends in a direction perpendicular to the circuit board, and the second radiating arm extends from the end of the first radiating arm in a direction parallel to the circuit board.

2. The single-frequency antenna as described in claim 1, characterized in that: The right end of the radiating part is positioned in front of the left end of the radiating part.

3. The single-frequency antenna as described in claim 1, characterized in that: The width of the first radiating arm extension path is fixed.

4. The single-frequency antenna as described in claim 1, characterized in that: The intersection of the second radiating arm and the first radiating arm is cut inward to form a notch, and the width of the end of the second radiating arm is greater than the width of the first radiating arm.

5. The single-frequency antenna as described in claim 4, characterized in that: The width of the first radiating arm is equal to the width of the second radiating arm at the notch.

6. A single-frequency antenna, characterized in that: The device comprises: a circuit board; a first radiator printed on the circuit board; and a second radiator fixed and connected to the first radiator, wherein the first radiator is a planar structure and the second radiator is a three-dimensional structure. The first radiator has a U-shaped radiating portion, the right arm of the U-shaped radiating portion has a ground terminal at its end, and the left arm of the U-shaped radiating portion has a feed terminal at its end. The length of the right arm of the U-shaped radiating portion is greater than the length of the left arm of the U-shaped radiating portion, and the width of the right arm of the U-shaped radiating portion is greater than the width of the left arm of the U-shaped radiating portion. The second radiator includes a first radiating arm and a second radiating arm. The first radiating arm is connected to the left arm of the U-shaped radiating portion and extends in a direction perpendicular to the circuit board. The second radiating arm extends from the end of the first radiating arm in a direction parallel to the circuit board.

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