Multifrequency printed antenna

Abstract

A multi-frequency printed antenna includes a circuit carrier plate, a radiator arranged on the right side of the circuit carrier plate, and a ground arranged on the left side of the circuit carrier plate. The radiator and the ground are arranged with a first interval therebetween. The radiator includes a first longitudinal radiation portion, a second radiation portion and a fifth radiation portion respectively extended rightward from the top end and the bottom end of the first radiation portion, a third radiation portion extended from the middle of the first radiation portion and bent multiple times and arranged with a feeding end at the left end, and a fourth radiation portion extended from the third radiation portion and arranged in an L shape. The ground includes a first longitudinal ground portion, a second ground portion and a fourth ground portion respectively extended leftward from the top end and the bottom end of the first ground portion, and a third ground portion extended from the middle of the first ground portion and arranged in a cross shape and arranged with a ground end at the right end.

Description

Technical Field

[0001] This utility model relates to an antenna, and more particularly to a printed antenna with multiple frequency bands. Background Technology

[0002] With the rapid advancement of mobile communication technology in recent years, various mobile devices have become wireless. Simultaneously, consumers' preference for more portable mobile devices has driven the miniaturization of commercially available mobile devices and peripherals. As mobile devices and peripherals become increasingly smaller, such as smart doorbells with built-in network cameras, the device itself is shrinking, which in turn limits the space occupied by the antenna housed within the casing. Within this limited space, the antenna needs to be able to provide multiple operating frequency bands to support the Wi-Fi frequency range. However, the miniaturization of the antenna itself makes providing multiple frequency bands challenging.

[0003] Therefore, it is necessary to provide a multi-band printed antenna that can provide multiple frequency bands in situations where space is limited. Summary of the Invention

[0004] The purpose of this utility model is to provide a multi-frequency printed antenna, comprising: a circuit board; a radiator disposed on the circuit board; and a grounding electrode disposed on the circuit board and isolated from the radiator. The radiator comprises a first radiating portion that is longitudinally elongated, a second radiating portion extending linearly to the right from the top of the first radiating portion, a third radiating portion extending to the right from the middle of the first radiating portion and bending multiple times, a fourth radiating portion extending to the right from the right end of the third radiating portion, and a fifth radiating portion extending linearly to the right from the bottom end of the first radiating portion. The second and fifth radiating portions are both transversely elongated. The third and fourth radiating portions maintain a distance from the second and fifth radiating portions. The right end of the third radiating portion has a feed end, and the upper right corner of the fourth radiating portion is cut inwards. The extension path of the fourth radiating part is approximately L-shaped; the grounding body is located to the left of the radiating body and is separated from the radiating body by a first distance. The grounding body is provided with a first grounding part that is longitudinally elongated, a second grounding part that extends straight to the left from the top of the first grounding part, a third grounding part that extends straight to the left from the middle of the first grounding part, and a fourth grounding part that extends straight to the left from the bottom of the first grounding part. The first grounding part is separated from the first radiating part by the first distance, and the top and bottom of the two are tangent to each other. The second grounding part and the fourth grounding part are both transversely elongated. The third grounding part is kept at a distance from the second grounding part and the fourth grounding part, and the upper left corner and the lower left corner of the third grounding part are both cut inward, so that the extension path of the third grounding part is approximately cross-shaped, and a grounding end is provided at the right end of the third grounding part.

[0005] In some embodiments, the third radiating portion includes a first radiating segment extending straight to the right from the middle position of the first radiating portion and a second radiating segment extending to the right from the right end of the first radiating segment and formed by four bends, wherein the first radiating segment is a horizontal strip and the second radiating segment is a wave shape with alternating vertical bends.

[0006] In some embodiments, the fourth radiating portion includes a first extension extending to the right from the right end of the first radiating segment and a second extension extending downward from the bottom of the first extension. The first extension is elongated, with a concave upper right corner such that the right end of the first extension is narrower than the right end of the first radiating segment. The second extension is formed by extending downward from the bottom of the first extension aligned with the right end of the fifth radiating portion. The bottom end of the second extension is at a distance from the fifth radiating portion, and the right end of the first extension is located to the right of both the right end of the second radiating portion and the right end of the fifth radiating portion.

[0007] In some embodiments, the third grounding portion includes a first grounding segment extending linearly to the left from the middle position of the first grounding portion, a second grounding segment extending upward from the left end of the first grounding segment, and a third grounding segment extending downward from the left end of the first grounding segment. The first grounding segment is transversely elongated, and the distance the first grounding segment extends to the left is greater than the distance the second grounding portion and the fourth grounding portion extend to the left. The distance the second grounding segment extends upward does not exceed the top edge of the second grounding portion. The upper left corner of the second grounding segment is concave, making the left end of the second grounding segment narrower than the right end of the second grounding segment. The distance the third grounding segment extends downward does not exceed the bottom edge of the fourth grounding portion. The lower left corner of the third grounding segment is concave, making the left end of the third grounding segment narrower than the right end of the third grounding segment.

[0008] In some embodiments, the left end of the second radiating portion is flush with the left end of the fifth radiating portion, the left end of the second grounding portion is flush with the left end of the fourth grounding portion, and the right edge of the second grounding segment is flush with the right edge of the third grounding segment. The right edge of the second grounding segment is separated from the left end of the second grounding portion by a second distance.

[0009] As stated above, the multi-frequency printed antenna of this invention can have multi-band functionality and support Wi-Fi bands in a limited space. Attached Figure Description

[0010] 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.

[0011] Figure 1 This is a structural diagram of the multi-frequency printed antenna of this utility model.

[0012] Figure 2 This is a voltage standing wave ratio (VSWR) test diagram of the multi-frequency printed antenna of this utility model.

[0013] Figure 3 This is the Smith chart of the multi-frequency printed antenna of this utility model.

[0014] Figure 4 This is a reflection loss diagram of the multi-frequency printed antenna of this utility model.

[0015] Figure 5 This is an efficiency diagram of the multi-frequency printed antenna of this utility model. Detailed Implementation

[0016] To explain in detail the technical content, structural features, achieved objectives, and effects of this multi-frequency printed 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.

[0017] Please see Figure 1 The multi-frequency printed antenna 100 of this invention is disposed on a circuit board 10 of an electronic device (not shown in the figure). The multi-frequency printed antenna 100 is composed of a radiator 20 and a grounding electrode 30, both of which are disposed on the circuit board 10. In this embodiment, the radiator 20 and the grounding electrode 30 are isolated from each other, and a first gap s1 is formed between them.

[0018] Please see again Figure 1 The radiator 20 is provided with a first radiating part 21, a second radiating part 22, a third radiating part 23, a fourth radiating part 24, and a fifth radiating part 25. The first radiating part 21 is longitudinally elongated and located at the center of the circuit carrier board 10. The second radiating part 22 extends straight to the right from the top of the first radiating part 21 and is transversely elongated. The third radiating part 23 extends to the right from the middle of the first radiating part 21 and is formed by multiple bends to extend the path length from the first radiating part 21 to the end of the third radiating part 23, and a feed end 26 is provided at the left end of the third radiating part 23. The fourth radiating part 24 extends to the right from the right end of the third radiating part 23, and the upper right corner of the fourth radiating part 24 is cut inward, making the extension path of the fourth radiating part 24 approximately L-shaped. The fifth radiating part 25 extends straight to the right from the bottom of the first radiating part 21 and is transversely elongated. In this embodiment, the third radiating part 23 and the fourth radiating part 24 are both kept at a distance from the second radiating part 22 and the fifth radiating part 25, and the distance that the second radiating part 22 extends to the right is equal to the distance that the fifth radiating part 25 extends to the right, so that the right end of the second radiating part 22 is aligned with the right end of the fifth radiating part 25.

[0019] The third radiating portion 23 includes a first radiating segment 231 extending straight to the right from the middle position of the first radiating portion 21, and a second radiating segment 232 extending to the right from the right end of the first radiating segment 231 and formed by four bends. The first radiating segment 231 is a horizontally elongated strip. In this embodiment, the second radiating segment 232 has a wave-like shape with alternating vertical bends.

[0020] The fourth radiating portion 24 includes a first extension segment 241 extending straight to the right from the right end of the first radiating segment 231 and a second extension segment 242 extending downward from the bottom end of the first extension segment 241. The first extension segment 241 is elongated, and its upper right corner is cut inward, making the right end of the first extension segment 241 narrower than the right end of the first radiating segment 231. The second extension segment 242 is formed by extending downward from the bottom end of the first extension segment 241 aligned with the right end of the fifth radiating portion 25, and the bottom end of the second extension segment 242 maintains a distance from the fifth radiating portion 25. In this embodiment, the distance the first extension segment 241 extends to the right is greater than the distance the first radiating segment 231 extends to the right, so that the right end of the first extension segment 241 is located to the right of the right ends of both the second radiating portion 22 and the fifth radiating portion 25.

[0021] Continue to refer to Figure 1 The grounding body 30 is located to the left of the radiator 20 and includes a first grounding portion 31, a second grounding portion 32, a third grounding portion 33, and a fourth grounding portion 34. The first grounding portion 31 is longitudinally elongated and is separated from the first radiator 21 by a first distance s1, with the top and bottom ends of both portions tangent to each other. The second grounding portion 32 extends linearly to the left from the top end of the first grounding portion 31 and is transversely elongated. The third grounding portion 33 extends to the left from the middle of the first grounding portion 31, its extension path approximating a cross shape, and a grounding end 36 is provided at its right end. The fourth grounding portion 34 extends linearly to the left from the bottom end of the first grounding portion 31 and is transversely elongated. In this embodiment, the third grounding part 33 maintains a distance from the second grounding part 32 and the fourth grounding part 34, and the distance that the second grounding part 32 extends to the left is equal to the distance that the fourth grounding part 34 extends to the left, so that the left end of the second grounding part 32 is aligned with the left end of the fourth grounding part 34.

[0022] The third grounding portion 33 includes a first grounding segment 331 extending linearly to the left from the middle of the first grounding portion 31, a second grounding segment 332 extending upward from the left end of the first grounding segment 331, and a third grounding segment 333 extending downward from the left end of the first grounding segment 331. The first grounding segment 331 is transversely elongated, and the distance the first grounding segment 331 extends to the left is greater than the distance the second grounding portion 32 and the fourth grounding portion 34 extend to the left. The right edge of the second grounding segment 332 is flush with the right edge of the third grounding segment 333, such that the right edge of the second grounding segment 332 is separated from the left end of the second grounding portion 32 by a second distance s2, and the right edge of the third grounding segment 333 is separated from the left end of the fourth grounding portion 34 by the same second distance s2. The upper left corner of the second grounding segment 332 is cut inward, making the left end of the second grounding segment 332 narrower than its right end. The lower left corner of the third grounding segment 333 is cut inward, making the left end of the third grounding segment 333 narrower than its right end. In this embodiment, the upward extension distance of the second grounding segment 332 does not exceed the top edge of the second grounding portion 32, and the downward extension distance of the third grounding segment 333 does not exceed the bottom edge of the fourth grounding portion 34.

[0023] When the multi-frequency printed antenna 100 of this utility model is used for wireless communication, the current is fed in through the feed terminal 26, flows through the first radiating part 21, and then through the third radiating part 23 and the fourth radiating part 24. Simultaneously, the first radiating part 21, the third radiating part 23, and the fourth radiating part 24 are relatively coupled to the first ground part 31 and the third ground part 33, and can oscillate in a frequency band of 2.4GHz to 2.5GHz. Conversely, when the current flows through the first radiating part 21, and then through the second radiating part 22 and the fifth radiating part 25, simultaneously, the second radiating part 22 and the fifth radiating part 25 are relatively coupled to the second ground part 32 and the fourth ground part 34, and can oscillate in a frequency band of 5GHz to 6GHz.

[0024] In this embodiment, the first spacing s1 and the second spacing s2 have certain size requirements, so that the first spacing s1 and the second spacing s2 have a coupling effect. Through the mutual transmission or interaction of electromagnetic waves from the radiator 20 and the grounding body 30, frequency bands of 2.4GHz to 2.5GHz and 5GHz to 6GHz can be oscillated. This allows the multi-frequency printed antenna 100 of this invention to increase the frequency bands it can provide within a limited space.

[0025] In practice, the first spacing s1 is 1 mm and the second spacing s2 is 2 mm.

[0026] Please see Figure 2 and Figure 3 The figures show the voltage standing wave ratio (VSWR) test results and Smith chart for the multi-frequency printed antenna 100 of this invention. When the multi-frequency printed antenna 100 operates at 2.4 GHz, the VSWR is 1.7573 (M1 in the figure); when operating at 2.45 GHz, the VSWR is 1.2659 (M2 in the figure); when operating at 2.5 GHz, the VSWR is 1.6786 (M3 in the figure); when operating at 5 GHz, the VSWR is 1.1561 (M4 in the figure); and when operating at 6 GHz, the VSWR is 1.4803 (M5 in the figure). Therefore, the multi-frequency printed antenna 100 of this invention can operate stably in the frequency bands of 2.4GHz to 2.5GHz and 5GHz to 6GHz.

[0027] Please see again Figure 4 ,like Figure 4 As shown, the multi-frequency printed antenna 100 of this utility model operates in the frequency bands of 2.4GHz to 2.5GHz and 5GHz to 6GHz, and its bandwidth reflection loss is approximately within -10dB, indicating that the multi-frequency printed antenna 100 has low loss and high radiated energy.

[0028] Please see Figure 5 The diagram shows the efficiency of the multi-frequency printed antenna 100 of this invention. When the antenna operates at different frequencies, a higher efficiency value derived from the average power indicates better antenna performance. In this embodiment, the efficiency of the multi-frequency printed antenna 100 in the operating frequency bands of 2.4GHz to 2.5GHz and 5GHz to 6GHz is approximately 55%. Therefore, the multi-frequency printed antenna 100 of this invention can achieve high efficiency in the operating frequency band within a limited space while maintaining a certain level of performance.

[0029] In summary, the multi-frequency printed antenna 100 of this invention can increase the number of frequency bands provided in a limited space and supports the frequency band of Wi-Fi, thus adapting to the trend of miniaturization of electronic products.

[0030] 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 multi-frequency printed antenna, characterized in that: The circuit includes: a circuit board; a radiator disposed on the circuit board; and a grounding electrode disposed on the circuit board and isolated from the radiator. The radiator comprises a first radiating section that is longitudinally elongated, a second radiating section extending linearly to the right from the top of the first radiating section, a third radiating section extending to the right from the middle of the first radiating section and bending multiple times, a fourth radiating section extending to the right from the right end of the third radiating section, and a fifth radiating section extending linearly to the right from the bottom end of the first radiating section. The second and fifth radiating sections are both transversely elongated. The third and fourth radiating sections maintain a distance from the second and fifth radiating sections. The right end of the third radiating section has a feed-in end. The upper right corner of the fourth radiating section is cut inwards to extend the path of the fourth radiating section. The diameter is approximately L-shaped; the grounding body is located to the left of the radiator and is separated from the radiator by a first distance. The grounding body has a first grounding part that is longitudinally elongated, a second grounding part that extends straight to the left from the top of the first grounding part, a third grounding part that extends straight to the left from the middle of the first grounding part, and a fourth grounding part that extends straight to the left from the bottom of the first grounding part. The first grounding part is separated from the first radiator by the first distance, and the top and bottom of the two are tangent to each other. The second grounding part and the fourth grounding part are both transversely elongated. The third grounding part is kept at a distance from the second grounding part and the fourth grounding part, and the upper left corner and the lower left corner of the third grounding part are both cut inward, so that the extension path of the third grounding part is approximately cross-shaped, and a grounding end is provided at the right end of the third grounding part.

2. The multi-frequency printed antenna as described in claim 1, characterized in that: The third radiating part includes a first radiating segment extending straight to the right from the middle position of the first radiating part and a second radiating segment extending to the right from the right end of the first radiating segment and formed by four bends, wherein the first radiating segment is a horizontal strip and the second radiating segment is a wave shape with alternating vertical bends.

3. The multi-frequency printed antenna as described in claim 2, characterized in that: The fourth radiating portion includes a first extension segment extending to the right from the right end of the first radiating segment and a second extension segment extending downward from the bottom of the first extension segment. The first extension segment is elongated and concave at its upper right corner, making the right end of the first extension segment narrower than the right end of the first radiating segment. The second extension segment extends downward from the bottom of the first extension segment aligned with the right end of the fifth radiating portion. The bottom end of the second extension segment is at a distance from the fifth radiating portion, and the right end of the first extension segment is located to the right of both the right end of the second radiating portion and the right end of the fifth radiating portion.

4. The multi-frequency printed antenna as described in claim 2, characterized in that: The third grounding portion includes a first grounding segment extending linearly to the left from the middle of the first grounding portion, a second grounding segment extending upward from the left end of the first grounding segment, and a third grounding segment extending downward from the left end of the first grounding segment. The first grounding segment is horizontally elongated, and the distance the first grounding segment extends to the left is greater than the distance the second grounding portion and the fourth grounding portion extend to the left. The distance the second grounding segment extends upward does not exceed the top edge of the second grounding portion. The upper left corner of the second grounding segment is concave, making the left end of the second grounding segment narrower than the right end of the second grounding segment. The distance the third grounding segment extends downward does not exceed the bottom edge of the fourth grounding portion. The lower left corner of the third grounding segment is concave, making the left end of the third grounding segment narrower than the right end of the third grounding segment.

5. The multi-frequency printed antenna as described in claim 4, characterized in that: The left end of the second radiating part is flush with the left end of the fifth radiating part, the left end of the second grounding part is flush with the left end of the fourth grounding part, and the right edge of the second grounding segment is flush with the right edge of the third grounding segment. The right edge of the second grounding segment is separated from the left end of the second grounding part by a second distance.

Images