TWI847367B - Antenna apparatus - Google Patents

Abstract

An antenna apparatus includes a substrate, two T-shaped radiation portions, two feeding portions and an isolation structure. The substrate has a top surface, a side surface and a bottom surface. Two opposite ends of the side surfaces are respectively connected to the top surface and the bottom surface. The two T-shaped radiation portions are located on the top surface of the substrate. The two feeding portions are respectively connected to the two T-shaped radiation portions and are located on the side surface of the substrate. The isolation structure is located on the top surface of the substrate, and the isolation structure is disposed between the two T-shaped radiation portions.

Description

Antenna Device

The present invention relates to an antenna device, in particular to an antenna device with an isolation structure.

With the advancement of wireless communication technology, electronic devices such as mobile phones and personal digital assistants are constantly developing towards diversified functions, thinner and lighter devices, faster and more efficient data transmission, etc. In particular, wireless communication technology will enter the 6G era in 2030 and meet various life applications and business needs that 5G cannot meet.

However, electronic devices have more and more functions, and they are becoming thinner and lighter. Relatively speaking, the space for antennas is getting smaller and smaller. And with the continuous development of wireless communication technology, the demand for antenna bandwidth is also increasing. In addition, the smaller the antenna size, the higher the signal interference between multiple antennas. Therefore, the design of the antenna needs to increase the isolation between antennas and reduce the reflection loss of the antenna. Therefore, how to make the antenna have the characteristics of small size, high bandwidth, high isolation and low reflection loss is one of the problems that R&D personnel should solve.

The present invention provides an antenna device, so that the antenna has the characteristics of small size, high bandwidth, high isolation and low reflection loss.

An antenna device disclosed in an embodiment of the present invention comprises a substrate, two T-shaped radiating parts, two feeding parts and an isolation structure. The substrate has a top surface, a side surface and a bottom surface. The opposite ends of the side surface are connected to the top surface and the bottom surface respectively. The two T-shaped radiating parts are located on the top surface of the substrate. The two feeding parts are respectively connected to the two T-shaped radiating parts and are located on the side surface of the substrate. The isolation structure is located on the top surface of the substrate, and the isolation structure is arranged between the two T-shaped radiating parts.

According to the antenna device of the above embodiment, since an isolation structure is provided between the two T-shaped radiating parts, when the distance design value between the two T-shaped radiating parts is reduced, the isolation structure can be used to isolate the two T-shaped radiating parts to improve the isolation between the two T-shaped radiating parts. In this way, when the two T-shaped radiating parts are closely arranged, the isolation structure can be used to reduce the signal interference between the two T-shaped radiating parts, thereby taking into account the characteristics of reducing the size of the antenna device, high bandwidth of 3.37 GHz to 14.97 GHz, high isolation, and low reflection loss.

The above description of the content of the present invention and the following description of the implementation method are used to demonstrate and explain the principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

Please refer to Figures 1 to 3. Figure 1 is a three-dimensional schematic diagram of the antenna device according to the first embodiment of the present invention. Figure 2 is a top view schematic diagram of the antenna device according to the first embodiment of the present invention. Figure 3 is a partial enlarged schematic diagram of Figure 2.

The antenna device 10 of this embodiment includes a substrate 11, two T-shaped radiating parts 12, two feeding parts 13 and an isolation structure 14. The substrate 11 is made of, for example, glass fiber material. The substrate 11 has a top surface 111, a side surface 112 and a bottom surface 113. The opposite ends of the side surface 113 are connected to the top surface 111 and the bottom surface 113 respectively. The two T-shaped radiating parts 12 are located on the top surface 111 of the substrate 11. Each T-shaped radiating part 12 includes a first radiating unit 121 and a second radiating unit 122, and the first radiating unit 121 is connected to the second radiating unit 122. The two feeding portions 13 are respectively connected to the two second radiating units 122 of the two T-shaped radiating portions 12 and are located on the side surface 112 of the substrate 11 .

In this embodiment, the length L1 of the substrate 10 is 26.2 mm, the width W1 of the substrate 10 is 26 mm, and the thickness A of the substrate 10 is 0.8 mm.

In this embodiment, the length L2 of the two first radiation units 121 is 8.4 mm. The width W2 of the two first radiation units 121 is 6 mm. The distance D1 between each first radiation unit 121 and one side adjacent to the top surface 111 is 0.2 mm. The length L3 of the two second radiation units 122 is 9 mm. The width W3 of the two second radiation units 122 is 1.9 mm. The distance D3 between the two first radiation units 121 is 9 mm. The distance D4 between the two second radiation units 122 is 15 mm.

The isolation structure 14 is located on the top surface 111 of the substrate 11, and the isolation structure 14 is disposed between the two T-shaped radiation portions 12. The isolation structure 14 is made of a material that can shield electromagnetic waves, for example. The isolation structure 14 includes a plurality of isolation units 141. The plurality of isolation units 141 are arranged along a straight line, and any two adjacent isolation units 141 are connected. In detail, each of the plurality of isolation units 141 includes a square portion 1411 and a plurality of T-shaped portions 1412. The plurality of T-shaped portions 1412 are respectively connected to opposite sides of the square portion 1411. Each T-shaped portion 1412 includes a connecting section 14121, a first protruding section 14122, and a second protruding section 14123. The connecting section 14121 is connected to the square section 1411. The first protruding section 14122 and the second protruding section 14123 are connected to the connecting section 14121, and the first protruding section 14122 and the second protruding section 14123 are perpendicular to the connecting section 14121 and protrude in the opposite direction of the connecting section 14121. The lengths of the first protruding section 14122 and the second protruding section 14123 are different. In other words, the multiple T-shaped sections are in an asymmetric T shape. Through the design of the multiple square sections 1411 and the multiple T-shaped sections 1412, in addition to reducing the interference between the two T-shaped radiating sections 12 when transmitting signals, the reflection loss can also be reduced.

In this embodiment, the length L4 and width W4 of the plurality of square portions 141 are both 4.1 mm. The width W5 of the plurality of connecting segments 14121 is 0.2 mm. The length L5 of the plurality of first protruding segments 14122 is 0.6 mm. The width W6 of the plurality of first protruding segments 14122 is 0.3 mm. The length L6 of the plurality of second protruding segments 14123 is 2.7 mm. The width W7 of the plurality of second protruding segments 14123 is 0.1 mm.

Please refer to Figures 4 and 5. Figure 4 is a bottom view of the antenna device according to the first embodiment of the present invention. Figure 5 is a partial enlarged view of Figure 4.

In this embodiment, the antenna device 10 may further include a T-shaped grounding structure 15. The T-shaped grounding structure 15 is located on the bottom surface 113 of the substrate 11. The T-shaped grounding structure 15 includes a first grounding portion 151, a second grounding portion 152, and two third grounding portions 153. The second grounding portion 152 is connected to the middle section of the first grounding portion 151. The two third grounding portions 153 are respectively connected to the opposite sides of the second grounding portion 152. The two third grounding portions 153 and the first grounding portion 151 form two slits 154 together.

In this embodiment, the purpose of providing two third ground portions 153 and forming two slits 154 together with the first ground portion 151 is that since the reflection loss of the antenna device 10 in the 13 GHz to 14.5 GHz frequency band of 6G is lower than -10 dB (amplitude), the antenna device 10 can match the 13 GHz to 14.5 GHz frequency band of 6G.

In this embodiment, the length L7 of the first grounding portion 151 is 26.2 mm. The width W8 of the first grounding portion 151 is 7.8 mm. The length L8 of the second grounding portion 152 is 18.2 mm. The width W9 of the second grounding portion 152 is 6 mm. The length L9 of the third grounding portion 153 is 10.1 mm. The width W10 of the third grounding portion 153 is 0.4 mm. The width W11 of the second slit 154 is 0.25 mm.

Please refer to FIG6. FIG6 is a data comparison diagram of reflection loss between different antenna devices. As shown in FIG6. Compared with the antenna device without an isolation structure and the antenna device without an isolation structure and the first ground portion, the reflection loss of the antenna device of the present invention is below -6dB in the 6G frequency band of 10.7 GHz to 14.5 GHz, the 5G frequency band of n78 (3.3 GHz to 3.8 GHz) or the WIFI-6E frequency band (5.925 GHz to 7.125 GHz). In addition, in the 6G band, 5G n78 band and WIFI-6E band, except for a few bands of WIFI-6E where the reflection loss is slightly higher than -10dB, the reflection loss of the remaining bands is below -10dB. The antenna device without the isolation structure and the first grounding part has a reflection loss higher than -6dB in some bands of the 5G n78 band, and the antenna device without the isolation structure and the antenna device without the isolation structure and the first grounding part have a reflection loss higher than -10dB in some bands of the 6G band. In other words, by setting the isolation structure and the first grounding part in the antenna device, the reflection loss can be reduced.

Please refer to FIG7. FIG7 is another data comparison diagram of reflection loss between different antenna devices. As shown in FIG7. Compared with the antenna device without the third ground portion, the reflection loss of the antenna device of the present invention is less than -6dB in the 6G frequency band of 10.7 GHz to 14.5 GHz, the 5G frequency band of n78 (3.3 GHz to 3.8 GHz) or the WIFI-6E frequency band (5.925 GHz to 7.125 GHz). In addition, in the 6G band, 5G in the n78 band and WIFI-6E band, except for a few bands of WIFI-6E where the reflection loss is slightly higher than -10dB, the reflection loss of the remaining bands is below -10dB. The antenna device without the third grounding part has a reflection loss higher than -10dB in some bands of the 6G band from 10.7 GHz to 14.5 GHz. In other words, by setting the third grounding part in the antenna device, the reflection loss can be reduced.

According to the antenna device of the above embodiment, since an isolation structure is provided between the two T-shaped radiating parts, when the distance design value between the two T-shaped radiating parts is reduced, the isolation structure can be used to isolate the two T-shaped radiating parts to improve the isolation between the two T-shaped radiating parts. In this way, when the two T-shaped radiating parts are closely arranged, the isolation structure can be used to reduce the signal interference between the two T-shaped radiating parts, thereby taking into account the characteristics of reducing the size of the antenna device, high bandwidth from 3.37 GHz to 14.97 GHz, high isolation, and low reflection loss.

Although the present invention is disclosed as above with the aforementioned embodiments, they are not used to limit the present invention. Anyone skilled in similar techniques may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the patent protection scope of the present invention shall be subject to the scope defined by the application patent attached to this specification.

10: Antenna device 11: Substrate 111: Top surface 112: Side surface 113: Bottom surface 12: T-shaped radiating portion 121: First radiating unit 122: Second radiating unit 13: Feeding portion 14: Isolation structure 141: Isolation unit 1411: Square portion 1412: T-shaped portion 14121: Connecting section 14122: First protruding section 14123: Second protruding section 15: T-shaped grounding structure 151: First grounding portion 152: Second grounding portion 153: Third grounding portion 154: Slit L1, L2, L3, L4, L5, L6, L7, L8, L9: Length A: Thickness W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11: Width D1, D2, D3: Distance

FIG. 1 is a three-dimensional schematic diagram of an antenna device according to the first embodiment of the present invention. FIG. 2 is a top view schematic diagram of the antenna device according to the first embodiment of the present invention. FIG. 3 is a partially enlarged schematic diagram of FIG. 2. FIG. 4 is a bottom view schematic diagram of the antenna device according to the first embodiment of the present invention. FIG. 5 is a partially enlarged schematic diagram of FIG. 4. FIG. 6 is a data comparison diagram of reflection loss between different antenna devices. FIG. 7 is another data comparison diagram of reflection loss between different antenna devices.

10: Antenna device 11: Substrate 111: Top surface 112: Side surface 113: Bottom surface 12: T-shaped radiating portion 121: First radiating unit 122: Second radiating unit 13: Feeding portion 14: Isolation structure 141: Isolation unit 1411: Square portion 1412: T-shaped portion 14121: Connecting section 14122: First protruding section 14123: Second protruding section A: Thickness

Claims (9)

An antenna device includes: a substrate having a top surface, a side surface and a bottom surface, wherein two opposite ends of the side surface are connected to the top surface and the bottom surface respectively; two T-shaped radiating portions, wherein the two T-shaped radiating portions are located on the top surface of the substrate; two feeding portions, wherein the two feeding portions are connected to the two T-shaped radiating portions respectively and are located on the side surface of the substrate; and an isolation structure, which is located on the top surface of the substrate and is disposed between the two T-shaped radiating portions, and the isolation structure includes a plurality of isolation units, wherein the isolation units are arranged along a straight line. Any two adjacent isolation units are connected, each of the isolation units includes a square portion and a plurality of T-shaped portions, the T-shaped portions are respectively connected to different sides of the square portion, and each of the T-shaped portions includes a connecting section, a first protruding section and a second protruding section, the connecting section is connected to the square portion, the first protruding section and the second protruding section are connected to the connecting section, and the first protruding section and the second protruding section are perpendicular to the connecting section and protrude in the opposite direction of the connecting section, and the lengths of the first protruding section and the second protruding section are different. The antenna device as described in claim 1, wherein each of the T-shaped radiation parts includes a first radiation unit and a second radiation unit, the first radiation unit is connected to the second radiation unit, and the two second radiation units are respectively connected to the two feeding parts. The antenna device as described in claim 2, wherein the length of the substrate is 26.2 mm, the width of the substrate is 26 mm, the thickness of the substrate is 0.8 mm, the length of the two first radiation units is 8.4 mm, the width of the two first radiation units is 6 mm, the distance between each first radiation unit and one side adjacent to the top surface is 0.2 mm, the length of the two second radiation units is 9 mm, the width of the two second radiation units is 1.9 mm, and the distance between the two first radiation units is 9 mm, and the distance between the two second radiation units is 15 mm. The antenna device as described in claim 1, wherein the length and width of the square portions are both 4.1 mm, the length of the first protruding sections is 0.6 mm, the width of the first protruding sections is 0.3 mm, the length of the second protruding sections is 2.7 mm, the width of the second protruding sections is 0.1 mm, and the width of the connecting sections is 0.2 mm. The antenna device as described in claim 1 further includes a T-shaped grounding structure, which is located on the bottom surface of the substrate. The antenna device as described in claim 5, wherein the T-shaped grounding structure includes a first grounding portion, a second grounding portion and two third grounding portions, the second grounding portion is connected to the middle section of the first grounding portion, the two third grounding portions are respectively connected to the opposite sides of the second grounding portion, and the two third grounding portions respectively form two slits with the first grounding portion. The antenna device as described in claim 6, wherein the length of the first ground portion is 26.2 mm, the width of the first ground portion is 7.8 mm, the length of the second ground portion is 17.55 mm, the width of the second ground portion is 6 mm, the length of the third ground portion is 10.1 mm, the width of the third ground portion is 0.4 mm, and the width of the two slits is 0.25 mm. The antenna device as described in claim 1, wherein the substrate is made of glass fiber material. The antenna device as described in claim 1, wherein the isolation structure is made of a material that can shield electromagnetic waves.