Multi-frequency printed antenna

Abstract

A multi-frequency printed antenna includes: a circuit board; a first radiator disposed on the circuit board; a slot disposed on the right side of the first radiator; and a second radiator disposed on the right side of the slot. The two radiators are spaced apart. The second radiator has a first radiating portion extending downward from the upper right corner of the circuit board, and a second radiating portion extending downward and to the left from the bottom end of the first radiating portion to a sixth radiating portion. The top and bottom ends of the first radiating portion are flush with the top and bottom of the circuit board. The sixth radiating portion has a feed end at its left end. The left end of the top opening of the slot extends to the bottom edge of the circuit board and to the left between the two radiators, and the right end extends to the bottom edge of the circuit board and to the right inside the second radiator.

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 first radiator disposed on the circuit board in an inverted L-shape; a slot disposed on the right side of the first radiator; and a second radiator disposed on the right side of the slot. The second radiator includes a first radiating portion extending downward in a straight line from the upper right corner of the circuit board; a second radiating portion extending to the left in a straight line from the bottom end of the first radiating portion; a third radiating portion extending upward in a straight line from the left end of the second radiating portion; a fourth radiating portion extending to the right in a straight line from the upper right corner of the third radiating portion; a fifth radiating portion extending to the left in a straight line from the lower left corner of the third radiating portion; and a third radiating portion extending to the left in a straight line from the lower left corner of the fifth radiating portion. The sixth radiating part, wherein the top and bottom ends of the first radiating part are respectively aligned with the top and bottom edges of the circuit board, the second radiating part and the fourth radiating part are transversely elongated, the right end of the fourth radiating part is kept at a distance from the left edge of the first radiating part, and the left end of the sixth radiating part is provided with a feed end. The slot includes a top opening located at the top edge of the circuit board and a bottom opening penetrating the bottom edge of the circuit board. The top opening is located above the third radiating part, the left end of the top opening extends to the bottom edge of the circuit board and to the left between the first radiator and the second radiator, and the right end of the top opening extends to the bottom edge of the circuit board and to the right inside the second radiator.

[0005] In some embodiments, the first radiator includes a first extension extending upward in a straight line from the lower left corner of the circuit board, and a second extension extending to the right in a straight line from the upper right corner of the first extension. The first extension is longitudinally elongated, with its top and bottom ends aligned with the top and bottom edges of the circuit board, respectively. The right edge of the first extension is kept at a distance from the fifth and sixth radiating portions. The top end of the second extension is aligned with the top edge of the circuit board, and the right end of the second extension is kept at a distance from the third radiating portion.

[0006] In some embodiments, the slotting includes a first slot segment extending from the left end of the top opening toward the bottom edge of the circuit board, a second slot segment extending from the bottom end of the first slot segment toward the left side edge of the circuit board, a third slot segment extending from the left end of the second slot segment toward the bottom edge of the circuit board, a fourth slot segment extending from the lower left corner of the third slot segment toward the bottom edge of the circuit board, a fifth slot segment extending from the right end of the top opening toward the bottom edge of the circuit board, and a cutout area extending from the lower left corner of the fifth slot segment toward the left side edge of the circuit board. The feed end is located to the right of the fourth slot segment, and the horizontal position of the bottom end of the cutout area is higher than the top end of the fourth slot segment.

[0007] In some embodiments, the fifth groove segment is located between the left edge of the first radiating part and the right end of the fourth radiating part, and the hollowed-out area is located between the left edge of the first radiating part and the right edge of the third radiating part.

[0008] In some embodiments, the fourth groove is located between the left ends of the first radiator and the sixth radiator, the third groove is located between the left ends of the first radiator and the fifth radiator, the second groove is located between the top edges of the first radiator and the fifth radiator, and the first groove is located between the left edges of the first radiator and the third radiator.

[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, objectives, and effects of this multi-frequency printed antenna, the following embodiments are provided with accompanying drawings.

[0017] Please see Figure 1 The multi-frequency printed antenna 100 of this utility model is configured as a monopole antenna and includes a first radiator 20, a slot 50 disposed to the right of the first radiator 20, and a second radiator 30 disposed to the right of the slot 50. The first radiator 20 and the second radiator 30 are printed on a metal layer 40 disposed on a circuit board 10.

[0018] The circuit board 10 has opposing top and bottom edges, as well as opposing left and right edges. The slot 50 extends from the top edge of the circuit board 10 to the bottom edge and penetrates the metal layer 40. The slot 50 includes a top opening 51 at the top edge of the circuit board 10, a first slot segment 53 extending from the left end of the top opening 51 toward the bottom edge of the circuit board 10, a second slot segment 54 extending from the bottom end of the first slot segment 53 toward the left edge of the circuit board 10, a third slot segment 55 extending from the left end of the second slot segment 54 toward the bottom edge of the circuit board 10, a fourth slot segment 56 extending from the lower left corner of the third slot segment 55 toward the bottom edge of the circuit board 10, and a bottom opening 52 penetrating from the bottom end of the fourth slot segment 56 toward the bottom edge of the circuit board 10. A feed end 31 located on the right side of the fourth slot segment 56 is provided at the second radiator 30.

[0019] Continue reading Figure 1 The slot 50 has a fifth slot segment 57 extending from the right end of the top opening 51 toward the bottom edge of the circuit board 10, and the fifth slot segment 57 further extends to form a hollow area 58. The hollow area 58 is formed by extending from the lower left corner of the fifth slot segment 57 toward the left side edge of the circuit board 10, and the bottom of the hollow area 58 is horizontally higher than the top of the fourth slot segment 56.

[0020] Please see Figure 1The first radiator 20 extends in an inverted L-shape and includes a first extension 21 and a second extension 22. The first extension 21 extends upwards in a straight line from the lower left corner of the circuit board 10 and is longitudinally elongated. The top and bottom ends of the first extension 21 are respectively flush with the top and bottom edges of the circuit board 10. The second extension 22 extends to the right from the upper right corner of the first extension 21, and the top end of the second extension 22 is flush with the top edge of the circuit board 10.

[0021] Continue reading Figure 1 The second radiator 30 is provided with a first radiating portion 32, a second radiating portion 33, a third radiating portion 34, a fourth radiating portion 35, a fifth radiating portion 36, and a sixth radiating portion 37. The first radiating portion 32 extends downwards in a straight line from the upper right corner of the circuit carrier 10, and is longitudinally elongated, with its top and bottom ends respectively aligned with the top and bottom edges of the circuit carrier 10. The second radiating portion 33 extends to the left from the bottom end of the first radiating portion 32, and is transversely elongated. The third radiating portion 34 extends upwards in a straight line from the left end of the second radiating portion 33, extending upwards without touching the top edge of the circuit carrier 10, such that the top opening 51 is located above the third radiating portion 34. The fourth radiating section 35 extends linearly to the right from the upper right corner of the third radiating section 34, and is horizontally elongated. The right end of the fourth radiating section 35 maintains a distance from the left side edge of the first radiating section 32. The fifth radiating section 36 extends linearly to the left from the lower left corner of the third radiating section 34. The sixth radiating section 37 extends to the left from the lower left corner of the fifth radiating section 36, and is provided with the feed end 31. In this embodiment, the fifth groove segment 57 is located between the left side edge of the first radiating section 32 and the right end of the fourth radiating section 35, and the hollowed-out area 58 is located between the left side edge of the first radiating section 32 and the right side edge of the third radiating section 34.

[0022] The right edge of the first extension 21 maintains a distance from the fifth radiating portion 36 and the sixth radiating portion 37. The right end of the second extension 22 maintains a distance from the third radiating portion. In this embodiment, the fourth groove segment 56 is located between the right edge of the first extension 21 and the left end of the sixth radiating portion 37, the third groove segment 55 is located between the right edge of the first extension 21 and the left end of the fifth radiating portion 36, the second groove segment 54 is located between the bottom edge of the second extension 22 and the top edge of the fifth radiating portion 36, and the first groove segment 53 is located between the right end of the second extension 22 and the left edge of the third radiating 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 31, flows through the sixth radiating part 37, and then through the fifth radiating part 36, the third radiating part 34, the second radiating part 33, and the first radiating part 32, and can oscillate in a frequency band of 2.4GHz to 2.5GHz. Alternatively, when the current flows through the sixth radiating part 37, and then through the fifth radiating part 36, the third radiating part 34, and the fourth radiating part 35, and the third radiating part 34 and the fourth radiating part 35 are coupled relative to each other to the first extension part 21 and the second extension part 22, and can oscillate in a frequency band of 5GHz to 6GHz.

[0024] In this embodiment, the first slot segment 53 to the fifth slot segment 57 and the hollowed-out area 58 have certain size requirements, so that the first slot segment 53 to the fifth slot segment 57 and the hollowed-out area 58 have a coupling effect. Through the mutual transmission or interaction of electromagnetic waves from the first radiator 20 and the second radiator 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 width of the first groove segment 53 is 3.7 mm, the width of the second groove segment 54 is 1.15 mm, the width of the third groove segment 55 is 3.8 mm, the width of the fourth groove segment 56 is 1.5 mm, the width of the fifth groove segment 57 is 0.8 mm, and the width of the excavated area 58 is 5.2 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 1.3808 (M1 in the figure); when operating at 2.45 GHz, the VSWR is 1.2052 (M2 in the figure); when operating at 2.5 GHz, the VSWR is 1.251 (M3 in the figure); when operating at 5.15 GHz, the VSWR is 1.5177 (M4 in the figure); and when operating at 5.85 GHz, the VSWR is 1.7418 (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 -15dB, 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 65%. 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 utility model 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: It comprises: a circuit board; a first radiator disposed on the circuit board in an inverted L-shape; a slot disposed on the right side of the first radiator; and a second radiator disposed on the right side of the slot. The second radiator includes a first radiating portion extending downward in a straight line from the upper right corner of the circuit board; a second radiating portion extending to the left in a straight line from the bottom end of the first radiating portion; a third radiating portion extending upward in a straight line from the left end of the second radiating portion; a fourth radiating portion extending to the right in a straight line from the upper right corner of the third radiating portion; a fifth radiating portion extending to the left in a straight line from the lower left corner of the third radiating portion; and a sixth radiating portion extending to the left from the lower left corner of the fifth radiating portion. The top and bottom ends of the first radiating part are respectively aligned with the top and bottom edges of the circuit board. The second and fourth radiating parts are transversely elongated. The right end of the fourth radiating part is kept at a distance from the left edge of the first radiating part. The left end of the sixth radiating part is provided with a feed end. The slot includes a top opening located at the top edge of the circuit board and a bottom opening penetrating the bottom edge of the circuit board. The top opening is located above the third radiating part. The left end of the top opening extends to the bottom edge of the circuit board and to the left between the first radiator and the second radiator. The right end of the top opening extends to the bottom edge of the circuit board and to the right inside the second radiator.

2. The multi-frequency printed antenna as described in claim 1, characterized in that: The first radiator includes a first extension extending upward in a straight line from the lower left corner of the circuit board, and a second extension extending to the right in a straight line from the upper right corner of the first extension. The first extension is longitudinally elongated, and its top and bottom ends are respectively aligned with the top and bottom edges of the circuit board. The right edge of the first extension is kept at a distance from the fifth and sixth radiating parts. The top end of the second extension is aligned with the top edge of the circuit board, and the right end of the second extension is kept at a distance from the third radiating part.

3. The multi-frequency printed antenna as described in claim 2, characterized in that: The slotting includes a first slot extending from the left end of the top opening toward the bottom edge of the circuit board, a second slot extending from the bottom end of the first slot toward the left side edge of the circuit board, a third slot extending from the left end of the second slot toward the bottom edge of the circuit board, a fourth slot extending from the lower left corner of the third slot toward the bottom edge of the circuit board, a fifth slot extending from the right end of the top opening toward the bottom edge of the circuit board, and a cutout extending from the lower left corner of the fifth slot toward the left side edge of the circuit board. The feed end is located to the right of the fourth slot, and the bottom of the cutout is horizontally higher than the top of the fourth slot.

4. The multi-frequency printed antenna as described in claim 3, characterized in that: The fifth groove is located between the left edge of the first radiating part and the right end of the fourth radiating part, and the hollowed-out area is located between the left edge of the first radiating part and the right edge of the third radiating part.

5. The multi-frequency printed antenna as described in claim 3, characterized in that: The fourth groove is located between the left ends of the first radiator and the sixth radiator, the third groove is located between the left ends of the first radiator and the fifth radiator, the second groove is located between the top edges of the first radiator and the fifth radiator, and the first groove is located between the left edges of the first radiator and the third radiator.

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