CN-122029696-A - Flexible printed circuit substrate and antenna assembly comprising same

Abstract

The present disclosure relates to a flexible printed circuit substrate and an antenna assembly including the same. A flexible printed circuit board according to an embodiment of the present disclosure is configured of a plurality of layers, and includes a first substrate portion including a first power feeding pattern disposed on any one of the plurality of layers and electrically connected to an antenna and a plurality of first ground patterns disposed on both sides of the first power feeding pattern, a second substrate portion including a second power feeding pattern disposed on any one of the plurality of layers and electrically connected to a cable and a plurality of second ground patterns disposed on both sides of the second power feeding pattern, and a third substrate portion disposed between the first substrate portion and the second substrate portion so as to cover a portion of a side of a glass, the third substrate portion including a third power feeding pattern disposed on a first layer adjacent to the glass among the plurality of layers, and a third ground pattern disposed on a second layer, both ends of the third power feeding pattern being electrically connected to the first power feeding pattern and the second ground pattern, respectively, the third ground pattern being connected to the second ground pattern and the second ground pattern adjacent to the first power feeding pattern and the second power feeding pattern, and a portion adjacent to the second power feeding pattern being spaced apart from the first side of the glass, respectively, and the third substrate portion being adjacent to the second power feeding pattern and the second side of the glass.

Inventors

• Zheng Kangzai
• JIN DONGCHEN
• JIN YISHAN
• ZHENG BINGYUN
• LI SUYAN
• CUI GUOXIAN
• Pu Bingyong

Assignees

• LG电子株式会社

Dates

Publication Date

20260512

Application Date

20231017

Claims (15)

1. 1. A flexible printed circuit board comprising a plurality of layers, the flexible printed circuit board comprising: a first substrate section including a first power feeding pattern arranged on any one of the plurality of layers and electrically connected to the antenna, and a plurality of first ground patterns arranged on both sides of the first power feeding pattern; A second substrate part including a second power feeding pattern arranged on any one of the layers and electrically connected with the cable, and a plurality of second grounding patterns arranged on both sides of the second power feeding pattern, and A third substrate portion disposed between the first substrate portion and the second substrate portion so as to cover a part of the glass side edge, The third substrate portion includes a third power feeding pattern disposed on a first layer adjacent to the glass among the plurality of layers, and a third ground pattern disposed on a second layer, Both ends of the third power feeding pattern are electrically connected with the first power feeding pattern and the second power feeding pattern respectively, Both ends of the third ground pattern are electrically connected to the first ground pattern and the second ground pattern, respectively, The third power feeding pattern includes a first power feeding portion adjacent to one face of the glass, a second power feeding portion adjacent to a side of the glass, and a third power feeding portion adjacent to the other face of the glass, The interval between the orthographic projections of the first feeding portion and the third feeding portion increases as being away from the second feeding portion.
2. 2. The flexible printed circuit substrate of claim 1, wherein the flexible printed circuit substrate comprises, The third substrate portion includes a plurality of fourth ground patterns disposed on the first layer and on both sides of the third power feeding pattern.
3. 3. The flexible printed circuit substrate of claim 1, wherein the flexible printed circuit substrate comprises, The first feeding portion includes: a first line portion extending from one end of the third feeding pattern electrically connected to the first feeding pattern along a first direction, and A second wire portion extending from an end of the first wire portion after being bent at a predetermined angle in a second direction perpendicular to the first direction, The second feeding portion includes a third wire portion extending from an end of the second wire portion, The third feeding portion includes a fourth wire portion extending from an end of the third wire portion along the first direction.
4. 4. The flexible printed circuit substrate of claim 3 wherein, The third line portion extends along the first direction.
5. 5. The flexible printed circuit substrate of claim 3 wherein, The third feeding part includes a fifth wire part connecting the other end of the third feeding pattern electrically connected to the second feeding pattern and the end of the fourth wire part, The fifth line portion is formed in a shape bent along the second direction.
6. 6. The flexible printed circuit substrate of claim 5, wherein the flexible printed circuit comprises, The spacing between the orthographic projections of the first line portion and the fifth line portion exceeds the spacing between the orthographic projections of the second line portion and the fourth line portion.
7. 7. The flexible printed circuit substrate of claim 1, wherein the flexible printed circuit substrate comprises, The angle formed by the orthographic projections of the first power feeding portion and the third power feeding portion is equal to or more than a predetermined angle, and the predetermined angle corresponds to the maximum value of the length of a predetermined area where the orthographic projections of the first power feeding portion and the third power feeding portion overlap.
8. 8. The flexible printed circuit substrate of claim 7, wherein the flexible printed circuit comprises a plurality of conductive traces, The maximum value of the length of the predetermined region is set based on a waveguide wavelength corresponding to the maximum value of a frequency used in communication through the antenna.
9. 9. An antenna assembly, comprising: a main antenna including a main power supply line and a plurality of main ground patterns; A sub antenna including a sub feed line connected to the main feed line and a plurality of sub ground patterns connected to the plurality of main ground patterns, and A flexible printed circuit substrate composed of a plurality of layers, Comprising the following steps: A first substrate section including a first power supply pattern arranged on any one of the plurality of layers and connected to the sub power supply line, and a plurality of first ground patterns connected to the plurality of sub ground patterns; a second substrate section including a second power feeding pattern arranged on any one of the plurality of layers and electrically connected to the cable, and a plurality of second ground patterns arranged on both sides of the second power feeding pattern; A third substrate portion disposed between the first substrate portion and the second substrate portion so as to cover a part of the glass side edge, The third substrate portion includes a third power feeding pattern disposed on a first layer adjacent to the glass among the plurality of layers, and a third ground pattern disposed on a second layer, Both ends of the third power feeding pattern are electrically connected with the first power feeding pattern and the second power feeding pattern respectively, Both ends of the third ground pattern are electrically connected to the first ground pattern and the second ground pattern, respectively, The third power feeding pattern includes a first power feeding portion adjacent to one face of the glass, a second power feeding portion adjacent to a side of the glass, and a third power feeding portion adjacent to the other face of the glass, The interval between the orthographic projections of the first feeding portion and the third feeding portion increases as being away from the second feeding portion.
10. 10. The antenna assembly of claim 9 wherein the antenna assembly, The main antenna and the sub-antenna are located in a transparent region of the glass, The flexible printed circuit substrate is located in an opaque region of the glass.
11. 11. The antenna assembly of claim 9 wherein the antenna assembly, The transparency of the secondary antenna is lower than that of the primary antenna.
12. 12. The antenna assembly of claim 9 wherein the antenna assembly, The secondary antenna has a smaller area resistance than the primary antenna.
13. 13. The antenna assembly of claim 9 wherein the antenna assembly, The frequency of the signal corresponding to the auxiliary antenna exceeds the frequency of the signal corresponding to the main antenna.
14. 14. The antenna assembly of claim 9 wherein the antenna assembly, The first feeding portion includes: a first line portion extending from one end of the third feeding pattern electrically connected to the first feeding pattern along a first direction, and A second wire portion extending from an end of the first wire portion after being bent at a predetermined angle in a second direction perpendicular to the first direction, The second feeding portion includes a third wire portion extending from an end of the second wire portion, The third feeding portion includes a fourth wire portion extending from an end of the third wire portion along the first direction.
15. 15. The antenna assembly of claim 9 wherein the antenna assembly, The first feeding portion includes a first line portion extending in a first direction from one end of the third feeding pattern electrically connected to the first feeding pattern, The second feeding portion includes a third wire portion extending from an end of the first wire portion, The third feeding portion includes a fourth wire portion extending from an end of the third wire portion along the first direction and a fifth wire portion connecting the other end of the third feeding pattern electrically connected to the second feeding pattern and an end of the fourth wire portion, The fifth line portion is formed in a shape bent along a second direction perpendicular to the first direction.

Description

Flexible printed circuit substrate and antenna assembly comprising same Technical Field The present disclosure relates to a flexible printed circuit substrate and an antenna assembly including the same, and more particularly, to a flexible printed circuit substrate electrically connected with an antenna and an antenna assembly including the same. Background A vehicle (vehicle) refers to a means capable of transporting people or goods using kinetic energy. A typical example of the vehicle is an automobile. Recently, development work of various vehicle-mounted systems is being actively advanced for convenience and safety of users. In particular, wireless communication systems in which a vehicle wirelessly communicates with other vehicles, surroundings, base stations, and the like are increasingly important. In addition, wireless communication systems employing 5G communication technology are expected to be commercialized in the future, thereby providing more diversified services through vehicles. Conventionally, an antenna for realizing wireless communication is provided on one side of a vehicle body or is disposed in a lower portion of the vehicle body or a roof in a separate structure. However, if the antenna is provided on one side of the vehicle body in a separate structure, the area where the antenna is disposed may be abrupt unlike other areas, which may be a problem in terms of design. In addition, when the antenna is disposed in the lower portion of the vehicle body or roof, there is a problem in that the antenna efficiency is greatly reduced due to the material of the vehicle body or roof. On the other hand, in view of design aesthetics and antenna efficiency, a transparent antenna disposed on a vehicle glass (glass) may be disposed. In order to feed (feed) a transparent antenna, a method of connecting an RF cable to a substrate connected to the transparent antenna by soldering (welding) is currently used. However, the conventional method has problems such as inconvenient assembly and increased volume between the transparent antenna and the related structure. In addition, when the transparent antenna operates as a broadband antenna (broadband antenna), a scheme capable of minimizing the antenna feed loss and maximizing the antenna efficiency is required. Disclosure of Invention Technical problem to be solved The present disclosure is directed to solving the above-described problems, as well as other problems. Another object is to provide a flexible printed circuit board stably connecting an antenna and a connector and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate having various structures optimized for a glass position of an attached antenna in two layers of glass and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate capable of achieving thickness minimization and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate capable of reducing a feeding loss to an antenna operating in a broadband and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate capable of improving antenna efficiency in broadband operation and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate capable of preventing interference between power feeding lines to reduce power feeding loss, and an antenna assembly including the same. Another object is to provide a flexible printed circuit substrate capable of providing an antenna optimized for an area of an opaque region of glass and an antenna assembly including the same. Means for solving the technical problems The flexible printed circuit board according to an embodiment of the present disclosure for achieving the above object may include a first substrate portion including a first power feeding pattern disposed on any one of the plurality of layers to be electrically connected to an antenna and a plurality of first ground patterns disposed on both sides of the first power feeding pattern, a second substrate portion including a second power feeding pattern disposed on any one of the plurality of layers to be electrically connected to a cable and a plurality of second ground patterns disposed on both sides of the second power feeding pattern, and a third substrate portion disposed between the first substrate portion and the second substrate portion to cover a portion of a side of a glass, the third substrate portion including a third power feeding pattern disposed on a first layer adjacent to the glass among the plurality of layers, and a third ground pattern disposed on a second layer, both ends of the third power feeding pattern being electrically connected to the first power feeding pattern and the second power feeding pattern, respectively, and a portion of the third ground pattern being disposed on both sides o