TWM677350U - Multiband printed antenna - Google Patents

Abstract

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

Description

Multi-frequency printed antenna

This work relates to an antenna, and more particularly to a printed antenna with multiple frequency bands.

With the rapid advancement of mobile communication technology in recent years, various mobile devices have become wireless. Simultaneously, consumers prefer more portable mobile devices, driving the miniaturization of commercially available mobile devices and peripherals. As mobile devices and peripherals become smaller, such as smart doorbells with built-in network cameras, the device itself is becoming increasingly smaller. This, in turn, limits the space occupied by the antenna housed within the casing. To maintain this limited space, the antenna needs 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.

Therefore, it is necessary to provide a multi-frequency printed antenna that can provide multiple frequency bands in situations where space is limited.

The purpose of this invention is to provide a multi-frequency printed antenna, comprising: a circuit substrate; a first radiator disposed on the circuit substrate 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 from the upper right corner of the circuit substrate, a second radiating portion extending to the left from the bottom end of the first radiating portion, a third radiating portion extending upward from the left end of the second radiating portion, a fourth radiating portion extending to the right from the upper right corner of the third radiating portion, a fifth radiating portion extending to the left from the lower left corner of the third radiating portion, and a third radiating portion extending to the left from the lower left corner of the fifth radiating portion. The circuit has six radiating sections, wherein the top and bottom ends of the first radiating section are respectively aligned with the top and bottom edges of the circuit substrate; the second and fourth radiating sections are horizontally elongated; the right end of the fourth radiating section is at a distance from the left edge of the first radiating section; the left end of the sixth radiating section has a feed inlet; and the slot includes a section located at the top edge of the circuit substrate. The circuit board has a top opening and a bottom opening that extends through 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.

In some embodiments, the first radiator includes a first extension extending upward in a straight line from the lower left corner of the circuit substrate, 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 respectively aligning with the top and bottom edges of the circuit substrate. 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 substrate, and the right end of the second extension is kept at a distance from the third radiating portion.

In some embodiments, the slot 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 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 edge of the circuit board. The feed inlet 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.

In some embodiments, 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.

In some embodiments, the fourth groove segment is located between the left end of the first radiator and the sixth radiating part, the third groove segment is located between the left end of the first radiator and the fifth radiating part, the second groove segment is located between the top edge of the first radiator and the fifth radiating part, and the first groove segment is located between the left edge of the first radiator and the third radiating part.

As mentioned above, this invention provides a multi-band printed antenna that can function in a limited space and supports Wi-Fi bands.

To explain in detail the technical content, structural features, purpose, and effects of this multi-frequency printed antenna, the following examples are provided with accompanying drawings. For ease of explanation, in this patent specification, "above" is defined as a higher position facing the drawing, "below" is defined as a lower position facing the drawing, "left" is defined as the left-hand side facing the drawing, and "right" is defined as the right-hand side facing the drawing.

Please refer to the first figure. The multi-frequency printed antenna 100 of this invention is designed 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 substrate 10.

The circuit carrier 10 has opposite top edges and bottom edges, as well as opposite left and right edges. The slot 50 extends from the top edge of the circuit carrier 10 to the bottom edge of the circuit carrier 10 and penetrates the metal layer 40. The slot 50 includes a top opening 51 disposed at the top edge of the circuit carrier 10, a first slot segment 53 extending from the left end of the top opening 51 toward the bottom edge of the circuit carrier 10, a second slot segment 54 extending from the bottom end of the first slot segment 53 toward the left edge of the circuit carrier 10, a third slot segment 55 extending from the left end of the second slot segment 54 toward the bottom edge of the circuit carrier 100, a fourth slot segment 56 extending from the lower left corner of the third slot segment 55 toward the bottom edge of the circuit carrier 100, and a bottom opening 52 penetrating from the bottom end of the fourth slot segment 56 toward the bottom edge of the circuit carrier 10, and a feed end 31 for the second radiator 30 is provided on the right side of the fourth slot segment 56.

Referring again to 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 carrier 10, and the fifth slot segment 57 further extends to form a cutout area 58. The cutout area 58 is formed by extending from the lower left corner of the fifth slot segment 57 toward the left edge of the circuit carrier 10, and the bottom of the cutout area 58 is horizontally higher than the top of the fourth slot segment 56.

Please refer to the first figure. The extension path of the first radiator 20 is inverted L-shaped, and it is provided with a first extension 21 and a second extension 22. The first extension 21 extends upward in a straight line from the lower left corner of the circuit carrier 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 carrier 10. The second extension 22 extends to the right in a straight line 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 carrier 10.

Referring again to 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 downward 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 aligning 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 section 34 extends upward in a straight line from the left end of the second radiating section 33. The third radiating section 34 extends upward without touching the top edge of the circuit substrate 10, such that the top opening 51 is located above the third radiating section 34. The fourth radiating section 35 extends to the right in a straight line 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 edge of the first radiating section 32. The fifth radiating section 36 extends to the left in a straight line 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 the sixth radiating section 37 is provided with the feed inlet end 31. In this embodiment, the fifth groove segment 57 is located at the left 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 edge of the first radiating section 32 and the right edge of the third radiating section 34.

The right edge of the first extension 21 is kept at a distance from the fifth radiating part 36 and the sixth radiating part 37. The right end of the second extension 22 is kept at a distance from the third radiating part. 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 part 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 part 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 part 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 part 34.

When this multi-frequency printed antenna 100 is used for wireless communication, current is fed in through the feed terminal 31, flows through the sixth radiating section 37, and then through the fifth radiating section 36, the third radiating section 34, the second radiating section 33, and the first radiating section 32, producing a frequency band of 2.4GHz to 2.5GHz. When the current flows through the sixth radiating section 37, and then through the fifth radiating section 36, the third radiating section 34, and the fourth radiating section 35, and the third radiating section 34 and the fourth radiating section 35 are coupled to the first extension section 21 and the second extension section 22, producing a frequency band of 5GHz to 6GHz.

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, and can oscillate in the 2.4GHz~2.5GHz and 5GHz~6GHz frequency bands by mutual transmission or interaction of electromagnetic waves from the first radiator 20 and the second radiator 30. This allows the multi-frequency printed antenna 100 to increase the number of frequency bands it can provide within a limited space.

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.

Please refer to Figures 2 and 3, which show the voltage standing wave ratio (VSWR) test graphs and Smith charts for this multi-frequency printed antenna 100. 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); and when operating at 2.5 GHz, the VSWR is 1.251 (M3 in the figure). When the present invention's multi-frequency printed antenna 100 operates at 5.15 GHz, the voltage standing wave ratio (VSWR) is 1.5177 (M4 in the figure), and when the present invention's multi-frequency printed antenna 100 operates at 5.85 GHz, the voltage VSWR is 1.7418 (M5 in the figure). Therefore, the present invention's multi-frequency printed antenna 100 can operate stably in the frequency bands of 2.4 GHz to 2.5 GHz and 5 GHz to 6 GHz.

Please refer to Figure 4. As shown in Figure 4, the multi-frequency printed antenna 100 of this invention operates in the frequency range of 2.4GHz~2.5GHz and 5GHz~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.

Please refer to Figure 5, which shows the efficiency of the multi-frequency printed antenna 100 of this invention. When the antenna operates at different frequencies, the higher the efficiency value derived from the average power conversion, the better the antenna performance. In this embodiment, the efficiency of the multi-frequency printed antenna 100 in the operating frequency bands of 2.4GHz~2.5GHz and 5GHz~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.

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

Although the above-disclosed examples are provided in this case, they are not intended to limit the scope of this case. Anyone with ordinary knowledge in the relevant technical field may make some modifications and embellishments without departing from the spirit and scope of this case. Therefore, the scope of protection of this case shall be determined by the scope of the attached patent application.

100: Multi-frequency printed antenna 10: Circuit carrier 20: First radiator 21: First extension 22: Second extension 30: Second radiator 31: Feed-in end 32: First radiating section 33: Second radiating section 34: Third radiating section 35: Fourth radiating section 36: Fifth radiating section 37: Sixth radiating section 40: Metal layer 50: Groove 51: Top opening 52: Bottom opening 53: First groove segment 54: Second groove segment 55: Third groove segment 56: Fourth groove segment 57: Fifth groove segment 58: Cutout area M1~M5: Dot

The first figure is a structural diagram of the multi-frequency printed antenna of this invention. The second figure is a voltage standing wave ratio (VSWR) test diagram of the multi-frequency printed antenna of this invention. The third figure is a Smith chart of the multi-frequency printed antenna of this invention. The fourth figure is a reflection loss diagram of the multi-frequency printed antenna of this invention. The fifth figure is an efficiency diagram of the multi-frequency printed antenna of this invention.

100: Multi-frequency printed antenna

10: Circuit board

20: First Radiator

21: First Extension

22: Second Extension

30: Second Radiator

31: Feeding End

32: First Radiating Section

33: Second Radiation Section

34: Third Radiation Section

35: Fourth Radiation Section

36: Fifth Radiation Division

37: Sixth Radiation Division

40: Metal layer

50: Grooving

51: Top opening

52: Bottom opening

53: First Slot

54: Second section

55: Third section

56: Fourth section

57: Fifth section

58: Excavated Area

Claims (5)

A multi-frequency printed antenna includes: a circuit substrate; a first radiator disposed on the circuit substrate 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 from the upper right corner of the circuit substrate, a second radiating portion extending to the left from the bottom end of the first radiating portion, a third radiating portion extending upward from the left end of the second radiating portion, a fourth radiating portion extending to the right from the upper right corner of the third radiating portion, a fifth radiating portion extending to the left 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. Furthermore, the top and bottom ends of the first radiating portion are respectively aligned with the top and bottom edges of the circuit substrate; the second and fourth radiating portions are horizontally elongated; the right end of the fourth radiating portion maintains a distance from the left edge of the first radiating portion; the left end of the sixth radiating portion has a feed inlet; and the slot includes a top edge located at the top edge of the circuit substrate. The circuit board has an end opening and a bottom opening extending through 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. As described in claim 1, the multi-frequency printed antenna, wherein the first radiator includes a first extension extending upward in a straight line from the lower left corner of the circuit substrate, 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 respectively aligning with the top and bottom edges of the circuit substrate, and its right edge maintaining a distance from the fifth and sixth radiating portions. The top end of the second extension aligns with the top edge of the circuit substrate, and its right end maintains a distance from the third radiating portion. As described in claim 2, the multi-frequency printed antenna, wherein the slotting includes a first slot extending from the left end of the top opening toward the bottom edge of the circuit substrate, a second slot extending from the bottom end of the first slot toward the left edge of the circuit substrate, a third slot extending from the left end of the second slot toward the bottom edge of the circuit substrate, a fourth slot extending from the lower left corner of the third slot toward the bottom edge of the circuit substrate, a fifth slot extending from the right end of the top opening toward the bottom edge of the circuit substrate, and a cutout extending from the lower left corner of the fifth slot toward the left edge of the circuit substrate, wherein the feed inlet 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. The multi-frequency printed antenna as described in claim 3, wherein the fifth groove segment is located between the left edge of the first radiating section and the right end of the fourth radiating section, and the cutout area is located between the left edge of the first radiating section and the right edge of the third radiating section. The multi-frequency printed antenna as described in claim 3, wherein the fourth slot is located between the left end of the first radiator and the sixth radiator, the third slot is located between the left end of the first radiator and the fifth radiator, the second slot is located between the top edge of the first radiator and the fifth radiator, and the first slot is located between the left edge of the first radiator and the third radiator.