Flexible flat cable

Abstract

The invention relates to a flexible flat cable, which is provided with a coaxial line so as to reduce the degree of interference and loss of the flexible flat cable when transmitting an RF (Radio Frequency) signal or a high-speed signal through the coaxial line. In addition, an external insulating layer is omitted from the coaxial line adopted by the flexible flat cable provided by the utility model, so that the thickness of the flexible flat cable can be effectively reduced, and the flexible flat cable can be used in a space with limited height.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and more specifically, to a flexible flat cable that uses a coaxial line without an external insulating layer to transmit RF signals or high-speed signals. Background Art

[0002] Flexible cables are flat (thickness of about 0.20 to 0.40 mm) and bendable wires that can be used to transmit electrical signals in electronic devices with limited space. For example, as mobile phones and tablet computers are becoming thinner and lighter, flexible cables that can be bent to save space are needed to connect electrical components including antennas, displays, touch panels, buttons, batteries, etc. to transmit electrical signals.

[0003] It should be noted that the common types of flexible cables are flexible flat cables (FFC) and flexible printed circuit boards (FPC). The flexible flat cables are usually made of a film tape layer bonded to a metal conductor arrangement layer, and the metal conductor arrangement layer is composed of a plurality of slender metal conductors arranged. The flexible printed circuit board is usually an embedded circuit design on a film substrate.

[0004] Therefore, the structural design of the existing flexible flat cable and the flexible cable of the flexible printed circuit board cannot effectively prevent the leakage of the transmitted RF signal or high-speed signal. As a result, when the existing flexible cable transmits RF signals or high-speed signals in electronic devices, leakage loss or noise interference sources are easily generated, making it easy for RF signals or high-speed signals to be lost and distorted when transmitted in the flexible cable, thereby severely limiting the allowable transmission distance of RF signals or high-speed signals in the flexible cable, causing the performance of the flexible cable in transmitting RF signals or high-speed signals to fail to meet expectations.

[0005] Therefore, how to reduce the interference and loss of the flexible cable when transmitting RF signals or high-speed signals, and thus effectively increase the transmission distance of the flexible cable for RF signals or high-speed signals, is an urgent issue for those skilled in the art. Summary of the invention

[0006] In view of the shortcomings of the above-mentioned prior art, the present application provides a flexible flat cable, which includes: a flat cable assembly, the flat cable assembly having a first coaxial line and a second coaxial line, wherein the first coaxial line has a first coaxial line inner conductor layer, a first coaxial line inner insulation layer and a first coaxial line outer conductor layer, the first coaxial line inner insulation layer covers the first coaxial line inner conductor layer, and the first coaxial line outer conductor layer covers the first coaxial line inner insulation layer; the second coaxial line has a second coaxial line inner conductor layer, a second coaxial line inner insulation layer and a second coaxial line outer conductor layer, the second coaxial line inner insulation layer covers the first coaxial line inner conductor layer A second coaxial line inner conductor layer, the second coaxial line outer conductor layer covers the second coaxial line inner insulation layer; and a wiring rubber, the wiring rubber has an upper rubber film and a lower rubber film, the upper rubber film and the lower rubber film can be joined at both sides, so that the wiring rubber becomes an annular body that can cover and position the wiring group, and the wiring group and the wiring rubber can constitute a wiring component, in which the upper rubber film and the lower rubber film are respectively located above and below the first coaxial line outer conductor layer and the second coaxial line outer conductor layer, and the upper rubber film and the lower rubber film contact the first coaxial line outer conductor layer and the second coaxial line outer conductor layer.

[0007] Preferably, in the flexible cable of the present application, the cable component has a curved extension section, and the cable assembly is curved and extended in the curved extension section.

[0008] Preferably, in the flexible cable of the present application, the cable assembly further has at least one non-coaxial line, and in the cable assembly, the upper adhesive film and the lower adhesive film are respectively located above and below the non-coaxial line, wherein the first coaxial line, the second coaxial line and the non-coaxial line have substantially the same or different contour shapes or sizes of cross-sections; the non-coaxial line is a metal wire, an electronic wire or a plastic wire.

[0009] Preferably, in the flexible cable of the present application, the cable arrangement component further includes a coaxial line layout area and a non-coaxial line layout area, the first coaxial line and the second coaxial line are respectively laid in the coaxial line layout area, the non-coaxial line is laid in the non-coaxial line layout area, the coaxial line layout area and the non-coaxial line layout area can overlap or be separated, wherein, when the coaxial line layout area and the non-coaxial line layout area overlap, the non-coaxial line is located between the first coaxial line and the second coaxial line, and when the coaxial line layout area and the non-coaxial line layout area are separated, the non-coaxial line avoids the coaxial line layout area.

[0010] Preferably, in the flexible cable of the present application, the cable component further includes a wire separation space, which separates the first coaxial line, the second coaxial line and the non-coaxial line, and the separation distance between adjacent ones of the first coaxial line, the second coaxial line and the non-coaxial line is the same or different.

[0011] Preferably, in the flexible cable of the present application, in the cable component, the first coaxial line, the second coaxial line and the non-coaxial line are adjacent to each other.

[0012] Preferably, in the flexible cable of the present application, the upper adhesive film and the lower adhesive film respectively have an upper adhesive layer and a lower adhesive layer, the upper adhesive layer adheres the first coaxial line outer conductor layer and the second coaxial line outer conductor layer above the cable group, and the lower adhesive layer adheres the first coaxial line outer conductor layer and the second coaxial line outer conductor layer below the cable group.

[0013] Preferably, in the flexible cable of the present application, the upper adhesive film and the lower adhesive film respectively have an upper conductive layer and a lower conductive layer, the upper conductive layer electrically connects the first coaxial line outer conductor layer and the second coaxial line outer conductor layer, and the lower conductive layer electrically connects the first coaxial line outer conductor layer and the second coaxial line outer conductor layer.

[0014] Preferably, in the flexible flat cable of the present application, the upper adhesive film and the lower adhesive film are adhesive films, thermal adhesive films, or hot-pressed films; and the first coaxial line outer conductor layer and the second coaxial line outer conductor layer have a single-layer conductor structure or a multi-layer conductor structure composed of at least one of braided metal, wrapped metal, and wound metal.

[0015] Preferably, the flexible flat cable of the present application further comprises a plurality of auxiliary bonding lines, which are respectively located on both sides of the flat cable group to assist bonding of both sides of the upper adhesive film and the lower adhesive film.

[0016] Compared to the prior art, the present application provides a flexible flat cable, which is provided with a coaxial line to reduce the interference and loss of the flexible flat cable when transmitting RF signals or high-speed signals, thereby effectively increasing the transmission distance of the flexible flat cable for RF signals or high-speed signals. In addition, the coaxial line used in the flexible flat cable omits the outer insulation layer, so that the thickness of the flexible flat cable can be effectively reduced and used in a space with limited height. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings of this application will be combined with the description of the following embodiments to make the features and other advantages of the present application more clearly understood.

[0018] Figure 1 It is a three-dimensional schematic diagram of the flexible flat cable of the present application with multiple coaxial lines arranged side by side without the external insulation layer;

[0019] Figure 2 is a cross-sectional schematic diagram of two adjacent coaxial lines of the flexible cable of the present application arranged closely together;

[0020] Figure 3It is a cross-sectional schematic diagram of a plurality of coaxial lines of the flexible cable of the present application, in which two adjacent ones are spaced apart and arranged;

[0021] Figure 4 It is a three-dimensional schematic diagram of the flexible flat cable of the present application having non-coaxial lines arranged side by side and multiple coaxial lines without an external insulating layer;

[0022] Figure 5 It is a cross-sectional schematic diagram of a non-coaxial line and a plurality of coaxial lines of the flexible cable of the present application being closely arranged;

[0023] Figure 6 It is a cross-sectional schematic diagram of a non-coaxial line and a plurality of coaxial lines of the flexible cable of the present application, which are arranged in a spaced relationship;

[0024] Figure 7 It is a three-dimensional schematic diagram of the non-coaxial line and multiple coaxial lines of the flexible cable of the present application arranged in different zones;

[0025] Figure 8 It is a cross-sectional schematic diagram of the non-coaxial line and multiple coaxial lines of the flexible cable of the present application arranged in zones;

[0026] Fig. 9 It is a cross-sectional schematic diagram of the non-coaxial line and multiple coaxial lines of the flexible flat cable of the present application having the same wire diameter;

[0027] Fig.10 It is a cross-sectional schematic diagram of the non-coaxial line and multiple coaxial lines of the flexible cable of the present application with different wire diameters;

[0028] Fig.11 It is a cross-sectional schematic diagram of the cable rubber of the flexible cable of the present application having an adhesive layer;

[0029] Fig.12 It is a cross-sectional schematic diagram of the flexible cable rubber of the present application having a conductive layer;

[0030] Fig.13 is a cross-sectional schematic diagram of the flexible flat cable of the present application having a plurality of auxiliary bonding lines; and

[0031] Fig.14 It is a top view schematic diagram showing that the cable component of the flexible cable of the present application has a curved extension section. Description of Reference Numerals 1. Flexible cable 10 wiring components 101 Lines separate spaces 102 curved extension section 11 cable sets 111 First coaxial line 1111 Inner conductor layer of the first coaxial line 1112 Inner insulation layer of the first coaxial line 1113 First coaxial line outer conductor layer 112 Second coaxial line 1121 Second coaxial line inner conductor layer 1122 Inner insulation layer of the second coaxial line 1123 Second coaxial line outer conductor layer 113 non-coaxial line 1131 Non-coaxial conductor 114Joining auxiliary lines 12 cable rubber 121 adhesive film 1211 Upper adhesive layer 1212 upper conductive layer 122 lower film 1221 Lower adhesive layer 1222 lower conductive layer A1 Coaxial Cable Layout Area A2 Non-coaxial cable layout area DETAILED DESCRIPTION

[0032] The following content will be accompanied by the accompanying drawings to illustrate the technical content of the present application through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. In particular, the proportional relationship and relative position of each component in the accompanying drawings are only for exemplary purposes and do not represent the actual situation of the implementation of the present application.

[0033] For the technical ideas of the flexible cable in this application, please refer to Figures 1 to 14 The following are examples of embodiments.

[0034] In the above embodiment, the flexible flat cable 1 includes: a flat cable assembly 11 and a flat cable rubber 12. The flat cable assembly 11 has a first coaxial line 111 and a second coaxial line 112. The flat cable rubber 12 provides a covering and positioning function for the flat cable assembly 11. Figures 1 to 13 In the embodiment shown, the cable rubber 12 has an upper adhesive film 121 and a lower adhesive film 122. It should be noted that the upper adhesive film 121 and the lower adhesive film 122 can be selected as an adhesive film, a hot adhesive film, or a hot pressing film, but are not limited to these. Any material that can cover the positioning cable assembly 11 can be used as the upper adhesive film 121 and the lower adhesive film 122.

[0035] like Figures 1 to 13In the embodiment shown, the first coaxial line 111 omits the outer insulating layer and becomes a three-layer wire structure, wherein the three-layer wire structure means that the first coaxial line 111 has a first coaxial line inner conductor layer 1111, a first coaxial line inner insulating layer 1112 and a first coaxial line outer conductor layer 1113. The first coaxial line inner conductor layer 1111 provides transmission of RF signals or high-speed signals. The first coaxial line inner insulating layer 1112 covers and isolates the first coaxial line inner conductor layer 1111, thereby providing impedance matching for the transmission of RF signals or high-speed signals of the first coaxial line inner conductor layer 1111. The first coaxial line outer conductor layer 1113 covers the first coaxial line inner insulating layer 1112 to provide shielding as a metal shielding layer, thereby preventing the RF signals or high-speed signals transmitted by the first coaxial line inner conductor layer 1111 from leakage loss or forming a noise interference source for signal transmission, so that the performance of the flexible flat cable 1 in transmitting RF signals or high-speed signals, including the transmission distance, meets expectations. Optionally, the first coaxial line outer conductor layer 1113 has a single-layer conductor structure or a multi-layer conductor structure formed by at least one of braided metal, wrapped metal and wound metal.

[0036] Likewise, if Figures 1 to 13 In the embodiment shown, the second coaxial line 112 omits the outer insulating layer and becomes a three-layer wire structure, wherein the three-layer wire structure means that the second coaxial line 112 has a second coaxial line inner conductor layer 1121, a second coaxial line inner insulating layer 1122 and a second coaxial line outer conductor layer 1123. The second coaxial line inner conductor layer 1121 provides transmission of RF signals or high-speed signals. The second coaxial line inner insulating layer 1122 covers and isolates the second coaxial line inner conductor layer 1121, thereby providing impedance matching for the transmission of the RF signal or high-speed signal of the second coaxial line inner conductor layer 1121. The second coaxial line outer conductor layer 1123 covers the second coaxial line inner insulating layer 1122 to provide shielding as a metal shielding layer, thereby preventing the RF signal or high-speed signal transmitted by the second coaxial line inner conductor layer 1121 from leakage loss or forming a noise interference source for signal transmission, so that the performance of the flexible flat cable 1 in transmitting RF signals or high-speed signals, including the transmission distance, meets expectations. Optionally, the second coaxial line outer conductor layer 1123 has a single-layer conductor structure or a multi-layer conductor structure formed by at least one of braided metal, wrapped metal, and wound metal.

[0037] like Figures 1 to 13In the embodiment shown, the upper glue film 121 and the lower glue film 122 are respectively located above and below the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123, and the upper glue film 121 and the lower glue film 122 can be joined by, for example, bonding, so that the cable rubber 12 becomes an annular body that can cover and position the cable assembly 11, so that the upper glue film 121 and the lower glue film 122 can contact the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123, so that the first coaxial line 111 and the second coaxial line 112 can be arranged to form a flat and flexible cable component 10, so that the flexible cable 1 can be arranged in an electronic device with limited space to provide electrical signal transmission.

[0038] Alternatively, if Fig.14 As shown, the cable member 10 has a curved extension section 102, and the cable assembly 11 is curved and extended in the curved extension section 102, so that the flexible cable 1 can be arranged in an electronic device with limited space. Fig.14 As shown, the cable member 10 has a straight extension section, and the cable assembly 11 extends straight in the straight extension section, so that the flexible cable 1 can be arranged in an electronic device with limited space. Fig.13 As shown, the flexible cable 1 also has a plurality of auxiliary joining lines 114, which are coaxial lines or non-coaxial bodies (for example, the non-coaxial bodies) respectively located on both sides of the cable group 11. For example, the auxiliary joining lines 114 can be strip-shaped plastic lines, and can join the upper glue film 121 and the lower glue film 122 by melting, thereby assisting the joining of the upper glue film 121 and the lower glue film 122 on both sides.

[0039] like Fig.11 In the embodiment shown, the upper adhesive film 121 and the lower adhesive film 122 respectively have an upper adhesive layer 1211 and a lower adhesive layer 1221. It should be noted that the upper adhesive layer 1211 and the lower adhesive layer 1221 respectively adhere the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123 above and below the wiring assembly 11 to provide adhesive positioning for the first coaxial line 111 and the second coaxial line 112 so that the first coaxial line 111 and the second coaxial line 112 can be arranged to form a wiring assembly 10.

[0040] In addition, if Fig.12In the embodiment shown, the upper adhesive film 121 and the lower adhesive film 122 respectively have an upper conductive layer 1212 and a lower conductive layer 1222. It should be noted that the upper conductive layer 1212 and the lower conductive layer 1222 are respectively electrically connected to the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123 to provide a jumper between the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123, so that the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123 can be electrically connected to provide a shielding environment for the electrical signal transmission between the first coaxial line inner conductor layer 1111 and the second coaxial line inner conductor layer 1121, thereby avoiding the leakage loss of RF signals or high-speed signals transmitted between the first coaxial line inner conductor layer 1111 and the second coaxial line inner conductor layer 1121 or forming a noise interference source for signal transmission.

[0041] like Figures 4 to 10 In the embodiment shown, the cable assembly 11 may also have a plurality of non-coaxial lines 113, and the non-coaxial lines 113 may be strip-shaped metal wires, electronic wires, or plastic wires. In addition, the number of non-coaxial lines 113 in the cable assembly 11 is not limited to a plurality of lines, and it is not excluded that the number of non-coaxial lines 113 in the cable assembly 11 is one line. Furthermore, the cross-sectional profiles or dimensions of the first coaxial line 111, the second coaxial line 112, and the non-coaxial line 113 may be substantially the same or different. For example, the wire diameter d1 of the first coaxial line 111, the wire diameter d2 of the second coaxial line 112, and the wire diameter d3 of the non-coaxial line 113 may be substantially the same (please refer to Fig. 9 ) or different (please refer to Fig.10 ), moreover, the contour shape of the cross section of the non-coaxial line 113 can be selected to be non-circular.

[0042] like Figures 4 to 10 In the embodiment shown, the upper adhesive film 121 and the lower adhesive film 122 are not only located on the first coaxial line outer conductor layer 1113 and the second coaxial line outer conductor layer 1123, but can also be located above and below the non-coaxial line 113, respectively, so that the first coaxial line 111, the second coaxial line 112 and the second coaxial line outer conductor layer 1123 can be arranged to form a flat and flexible cable component 10, so that the flexible cable 1 can be used in electronic devices with limited space to transmit electrical signals including RF signals (or high-speed signals) and non-RF signals.

[0043] The first coaxial line 111 and the second coaxial line 112 are respectively arranged in the coaxial line arrangement area A1 of the wiring member 10, and the non-coaxial line 113 is arranged in the non-coaxial line arrangement area A2 of the wiring member 10. Figure 6In the embodiment shown, the coaxial line layout area A1 and the non-coaxial line layout area A2 can overlap. When the coaxial line layout area A1 and the non-coaxial line layout area A2 overlap, the non-coaxial line 113 is located between the first coaxial line 111 and the second coaxial line 112 to meet the requirements of electronic equipment for signal transmission. However, it is not limited to the above. The coaxial line layout area A1 and the non-coaxial line layout area A2 can be separated. When the coaxial line layout area A1 and the non-coaxial line layout area A2 are separated, the non-coaxial line 113 avoids the coaxial line layout area A1, so that the first coaxial line 111, the second coaxial line 112 and the non-coaxial line 113 are separated to meet the requirements of electronic equipment for signal transmission.

[0044] like Figure 5 and Figure 8 In the embodiment shown, in the cable arrangement member 10, the first coaxial line 111, the second coaxial line 112 and the non-coaxial line 113 are close to each other. However, the present invention is not limited thereto, and the first coaxial line 111, the second coaxial line 112 and the non-coaxial line 113 can be separated from each other, such as Figure 6 and Figures 9 and 10 In the embodiment shown, the wiring component 10 also includes a wire separation space 101 to separate the first coaxial line 111, the second coaxial line 112 and the non-coaxial line 113 through the wire separation space 101. In this regard, it should be noted that the separation distance between adjacent ones of the first coaxial line 111, the second coaxial line 112 and the non-coaxial line 113 can be selected to be the same or different.

[0045] It should be noted that the flexible cable of the present application may also omit some components and is not limited to the above embodiments.

[0046] For example, the flexible cable of the present application includes: a cable assembly and a cable rubber. The cable assembly has a first coaxial line and a second coaxial line, wherein the first coaxial line has a first coaxial line inner conductor layer, a first coaxial line inner insulation layer and a first coaxial line outer conductor layer, the first coaxial line inner insulation layer covers the first coaxial line inner conductor layer, and the first coaxial line outer conductor layer covers the first coaxial line inner insulation layer; the second coaxial line has a second coaxial line inner conductor layer, a second coaxial line inner insulation layer and a second coaxial line outer conductor layer, the second coaxial line inner insulation layer covers the second coaxial line inner conductor layer, and the second coaxial line outer conductor layer covers the second coaxial line inner insulation layer. The cable rubber has an upper rubber film and a lower rubber film, and the two sides of the upper rubber film and the lower rubber film can be joined to make the cable rubber an annular body that can cover and position the cable group, so that the cable group and the cable rubber can constitute a cable component. In the cable component, the upper rubber film and the lower rubber film are respectively located above and below the outer conductor layer of the first coaxial line and the outer conductor layer of the second coaxial line, and the upper rubber film and the lower rubber film contact the outer conductor layer of the first coaxial line and the outer conductor layer of the second coaxial line.

[0047] In summary, the present application provides a flexible flat cable, which is provided with a coaxial line to reduce the interference and loss of the flexible flat cable when transmitting RF signals or high-speed signals through the coaxial line, thereby effectively increasing the transmission distance of the flexible flat cable for RF signals or high-speed signals. In addition, the coaxial line used in the provided flexible flat cable omits the outer insulation layer, so that the thickness of the flexible flat cable can be effectively reduced and used in a space with limited height.

[0048] The above embodiments are merely illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art may modify and change the above embodiments without violating the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be as set forth in the claims of the present application.

Claims

1. A flexible cable, comprising: A cable assembly, wherein the cable assembly comprises a first coaxial line and a second coaxial line, wherein: The first coaxial line comprises a first coaxial line inner conductor layer, a first coaxial line inner insulation layer and a first coaxial line outer conductor layer, the first coaxial line inner insulation layer covers the first coaxial line inner conductor layer, and the first coaxial line outer conductor layer covers the first coaxial line inner insulation layer; The second coaxial line comprises a second coaxial line inner conductor layer, a second coaxial line inner insulation layer and a second coaxial line outer conductor layer, the second coaxial line inner insulation layer covers the second coaxial line inner conductor layer, and the second coaxial line outer conductor layer covers the second coaxial line inner insulation layer; and A cable arrangement rubber, wherein the cable arrangement rubber comprises an upper rubber film and a lower rubber film, wherein the upper rubber film and the lower rubber film can be joined at both sides to make the cable arrangement rubber an annular body that can cover and position the cable arrangement wire group, and the cable arrangement wire group and the cable arrangement rubber can constitute a cable arrangement component, wherein the upper rubber film and the lower rubber film are respectively located above and below the outer conductor layer of the first coaxial line and the outer conductor layer of the second coaxial line, and the upper rubber film and the lower rubber film contact the outer conductor layer of the first coaxial line and the outer conductor layer of the second coaxial line.

2. The flexible flat cable according to claim 1, wherein: The cable arrangement member has a curved extension section, and the cable arrangement wire group is curved and extends in the curved extension section.

3. The flexible flat cable according to claim 1, wherein: The wiring arrangement group also has at least one non-coaxial line. In the wiring arrangement component, the upper glue film and the lower glue film are respectively located above and below the non-coaxial line, wherein the contour shape or size of the cross-section of the first coaxial line, the second coaxial line and the non-coaxial line are substantially the same or different; the non-coaxial line is a metal wire, an electronic wire or a plastic wire.

4. The flexible flat cable according to claim 3, wherein: The wiring component also includes a coaxial line layout area and a non-coaxial line layout area, the first coaxial line and the second coaxial line are respectively laid in the coaxial line layout area, the non-coaxial line is laid in the non-coaxial line layout area, the coaxial line layout area and the non-coaxial line layout area can overlap or be separated, wherein, when the coaxial line layout area and the non-coaxial line layout area overlap, the non-coaxial line is located between the first coaxial line and the second coaxial line, and when the coaxial line layout area and the non-coaxial line layout area are separated, the non-coaxial line avoids the coaxial line layout area.

5. The flexible flat cable according to claim 3, wherein: The wire arrangement component further includes a wire separation space, which separates the first coaxial line, the second coaxial line and the non-coaxial line. The separation distances between adjacent ones of the first coaxial line, the second coaxial line and the non-coaxial line are the same or different.

6. The flexible flat cable according to claim 3, wherein: In the cable arrangement component, adjacent ones of the first coaxial line, the second coaxial line, and the non-coaxial line are closely adjacent to each other.

7. The flexible flat cable according to claim 1, wherein: The upper adhesive film and the lower adhesive film respectively have an upper adhesive layer and a lower adhesive layer, the upper adhesive layer adheres the first coaxial line outer conductor layer and the second coaxial line outer conductor layer above the wiring assembly, and the lower adhesive layer adheres the first coaxial line outer conductor layer and the second coaxial line outer conductor layer below the wiring assembly.

8. The flexible flat cable according to claim 1, wherein: The upper glue film and the lower glue film respectively have an upper conductive layer and a lower conductive layer, the upper conductive layer electrically connects the first coaxial line outer conductor layer and the second coaxial line outer conductor layer, and the lower conductive layer electrically connects the first coaxial line outer conductor layer and the second coaxial line outer conductor layer.

9. The flexible flat cable according to claim 1, wherein: The upper adhesive film and the lower adhesive film are adhesive films, thermal adhesive films, and hot-pressed films; and the first coaxial line outer conductor layer and the second coaxial line outer conductor layer have a single-layer conductor structure or a multi-layer conductor structure composed of at least one of braided metal, wrapped metal, and wound metal.

10. The flexible flat cable according to claim 1, wherein: It also includes a plurality of auxiliary bonding lines, which are respectively located on both sides of the wiring line group to assist the bonding of the upper glue film and the lower glue film.

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