CN210271842U - Low loss transmission line and apparatus - Google Patents
Low loss transmission line and apparatus Download PDFInfo
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- CN210271842U CN210271842U CN201921442689.8U CN201921442689U CN210271842U CN 210271842 U CN210271842 U CN 210271842U CN 201921442689 U CN201921442689 U CN 201921442689U CN 210271842 U CN210271842 U CN 210271842U
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Abstract
The utility model provides a low-loss transmission line and a device, which relate to the technical field of communication electronics and comprise at least three metal layers and at least three media; the at least three metal layers comprise a first metal layer, a second metal layer and a third metal layer; the at least three layers of media include a first media, a second media, and a third media; the second medium and the second metal layer form a transmission layer; the second metal layer comprises at least one signal wire for transmitting signals; the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer; an air gap is formed among the first metal layer, the third metal layer, the first medium and the third medium, so that electric conduction is realized; by arranging the medium structure between the first metal layer and the third metal layer, air gaps are increased, and loss in the signal transmission process is reduced.
Description
Technical Field
The utility model belongs to the technical field of the communication electronics technique and specifically relates to a low-loss transmission line and device.
Background
As the user's demand for mobile terminal devices has increased, higher demands have been placed on the signal quality of the devices. Signal transmission is a very important ring in a terminal device, and the overall signal quality of the device can be effectively improved due to lower signal transmission loss.
As mobile terminal devices are gradually developed to be thinner and lighter, and signal transmission devices corresponding to the mobile terminal devices are also required to be thinner, flat strip lines are gaining attention, and the use of flat strip lines for signal transmission is one of the trends in future applications. The conventional flat strip line is usually connected by adding an adhesive layer between the dielectric layer and the connection layer, and the connection mode has the problem of large signal loss.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a low-loss transmission line to solve the problem of large signal loss in the prior art.
In a first aspect, an embodiment of the present invention provides a low-loss transmission line, including: at least three metal layers and at least three dielectrics;
the at least three metal layers comprise a first metal layer, a second metal layer and a third metal layer;
the at least three layers of media include a first media, a second media, and a third media; the second medium and the second metal layer form a transmission layer; the second metal layer comprises at least one signal wire for transmitting signals;
the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer;
and an air gap is formed among the first metal layer, the third metal layer, the first medium and the third medium.
Optionally, the transmission layer is disposed in the air gap and connected to the first metal layer.
Optionally, the first metal layer includes a first metal, a second metal, and a third metal, and the first metal is connected to the second metal and the third metal, respectively;
the third metal layer comprises a fourth metal, a fifth metal and a sixth metal, and the sixth metal is respectively connected with the fourth metal and the fifth metal; the connection mode comprises welding and double-sided conductive adhesive.
Optionally, the third dielectric further includes a plurality of metalized through holes, and the plurality of metalized through holes connect the first metal layer and the third metal layer.
Optionally, the first metal layer includes a first signal island and a second signal island; the first signal island and the second signal island are respectively arranged at two ends of the first metal layer; the metallized through holes are connected with signal lines arranged in the second metal layer.
Optionally, the material of the at least three layers of dielectric is one or a combination of a high-frequency plate, a carrier-like plate and a ceramic plate.
Optionally, the metal layer further includes a fourth dielectric and a fifth dielectric, a bottom surface of the fourth dielectric is connected to the top surface of the first metal layer, and a top surface of the fifth dielectric is connected to the bottom surface of the third metal layer.
Optionally, the connection manner of the fourth medium and the first metal layer and the connection manner of the fifth medium and the third metal layer are both press-fit connections.
Optionally, the transmission layer is laminated on the first metal layer.
In a second aspect, embodiments of the present invention provide a low-loss transmission device, including any one of the low-loss transmission lines mentioned in the first aspect.
The embodiment of the utility model provides a low-loss transmission line, which comprises three metal layers and at least three media; the three metal layers comprise a first metal layer, a second metal layer and a third metal layer; the at least three layers of media include a first media, a second media, and a third media; the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer; an air gap is formed between the first medium and the third medium, so that electric conduction is realized; by arranging the medium structure between the first metal layer and the third metal layer, air gaps are increased, and loss in the signal transmission process is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a cross-sectional side view of a low-loss transmission line according to an embodiment of the present invention;
fig. 2 is a cross-sectional side view of a low-loss transmission line assembly according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an overall stacked layer of a low-loss transmission line according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an assembled low-loss transmission line according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an overall stacked layer of a low-loss transmission line according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a plurality of signal lines of a low-loss transmission line according to an embodiment of the present invention;
fig. 7 is a view of an overall stacked layer of a low-loss transmission line metal structure according to an embodiment of the present invention.
Icon: 301-a fourth medium; 302-a first metal; 303-a second metal; 304-a third metal; 305-a second metal layer; 306-a first medium; 307-a second medium; 308-a third medium; 309-a fourth metal; 310-a fifth metal; 311-sixth metal; 312-a fifth medium; 313-a via hole; 314-air gap; d1 — first metal layer; d2-transport layer; d3 — a third metal layer; 510-a first signal island; 520-second signal island.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As the user's demand for mobile terminal devices has increased, higher demands have been placed on the signal quality of the devices. Signal transmission is a very important ring in terminal equipment, and during the signal transmission process, the overall signal quality of the equipment can be effectively improved due to lower signal transmission loss, so that the reduction of the signal loss during the transmission process is very important. At present, the widely used flat strip transmission line is popular due to its light, thin and easy-to-fold structure. A plurality of medium layers are generally arranged on a conventional flat strip transmission line, a bonding layer is required to be added between the medium layers and the connecting layers for connection, or the medium layers and the connecting layers are connected in a full-page laminating mode, the processing cost is increased in the two modes, and the signal loss is large.
Consider the great problem of transmission line signal loss that exists among the prior art, the embodiment of the utility model provides a low-loss transmission line: comprises at least three metal layers and at least three media; the at least three metal layers comprise a first metal layer, a second metal layer and a third metal layer; the at least three layers of media include a first media, a second media, and a third media; the second medium and the second metal layer form a transmission layer; the second metal layer comprises at least one signal wire for transmitting signals; the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer; an air gap is formed among the first metal layer, the third metal layer, the first medium and the third medium, so that electric conduction is realized; through the structure that sets up the medium between first metal level and third metal level, increased the air gap, solved the great problem of loss in the signal transmission process.
The two embodiments shown in fig. 1 and 2 are both cross-sectional views X1-X1 of fig. 4. In the embodiment shown in fig. 1 and 2, the low loss transmission line comprises three metal layers: first metal layer D1, second metal layer 305, and third metal layer D3; wherein the first metal layer D1 includes a first metal 302, a second metal 303, and a third metal 304; third metal layer D3 includes fourth metal 309, fifth metal 310, and sixth metal 311.
Embodiments provide a low loss transmission line further comprising at least three layers of dielectric: a first medium 306, a second medium 307, and a third medium 308. Wherein, the second medium 307 is attached to the second metal layer 305 to form a transmission layer D2; the top surface of the first dielectric 306 is connected to the second metal 303 at the side of the first metal layer D1, and the bottom surface of the first dielectric 306 is connected to the fourth metal 309 at the side of the third metal layer D3; the top surface of the third dielectric 308 is connected to the third metal 304 on the other side of the first metal layer D1, and the bottom surface of the third dielectric 308 is connected to the fifth metal 310 on the other side of the third metal layer D3.
An air gap 314 is formed among the first metal layer D1, the third metal layer D3, the first medium 306 and the third medium 308, and a transmission layer D2 composed of the second medium 307 and the second metal layer 305 is arranged in the air gap 314 and connected with the first metal layer D1; the second metal layer 305 further includes at least one signal line for transmitting an electrical signal.
In some embodiments, the materials constituting the first medium 306, the second medium 307 and the third medium 308 may be any one of a high frequency plate, a carrier-like plate, a ceramic plate, or a combination thereof, or a combination with other high frequency materials; the material of the first metal layer D1, the second metal layer 305, and the third metal layer D3 may be copper, or may be other metals that can be used for soldering.
In the embodiment shown in fig. 1, a first metal layer D1 composed of a first metal 302, a second metal 303, and a third metal 304, and a third metal layer D3 composed of a fourth metal 309, a fifth metal 310, and a sixth metal 311 are respectively located at two sides of a transmission layer D2 composed of a second medium 307 and a second metal layer 305, and are used for protecting signal lines disposed on the transmission layer D2, shielding external interference, and reducing signal loss.
The low-loss transmission line provided by the embodiments shown in fig. 1 and 2 further includes a fourth dielectric 301 and a fifth dielectric 312, the fourth dielectric 301 is disposed above the first metal layer D1, and the fifth dielectric 312 is disposed below the third metal layer D3; the fourth medium 301 and the fifth medium 312 function to shield external interference and protect signal lines located on the transmission layer D2.
In some embodiments, as shown in fig. 1, the first metal layer D1 and the transmission layer D2 are connected to the second medium 307 through the first metal 302, the first metal 302 and the second medium 307 are connected in a full-page lamination manner, and a contact area between the first metal 302 of the first metal layer D1 and the second medium 307 of the transmission layer D2 is smaller, which reduces a lamination area; the cost caused by pressing is greatly reduced.
In the above embodiment, the first medium 306 and the third medium 308 are disposed on both the right and left sides of the transfer layer D2 in the manner shown in fig. 1, and an air gap 314 is left. Since the Dielectric Constant (DK) and the loss factor (Df) of air are the lowest compared to other media, i.e., the ability to obstruct signal transmission is smaller than that of other media, the loss of signal is the least, so the air gap 314 can sufficiently reduce the loss during signal transmission; meanwhile, due to the existence of the air gap 314, the transmission layer D2 can be assembled more conveniently, the contact area between the transmission layer and the first metal layer D1 is reduced, and the pressing cost is further reduced.
Additionally, the first dielectric 306 and the third dielectric 308 may also include a number of metalized via holes 313 in some embodiments. The through via 313 connects the first metal layer D1 and the third metal layer D3 to form a complete closed-loop ground.
In some embodiments, the connections between the layers as shown in fig. 3 may be in the following manner: the first metal 302, the second metal 303 and the third metal 304 which form the first metal layer D1 are respectively connected in a welding or double-sided conductive adhesive bonding mode; the sixth metal 311 and the fourth metal 309 and the fifth metal 310 which form the third metal layer D3 are connected by welding or double-sided conductive adhesive. The first metal layer D1 is connected with the third metal layer D3 through the first medium 306 and the third medium 308; the first dielectric 306 is connected with the second metal 303 and the fourth metal 309 in a pressing or double-sided conductive adhesive manner, and the third dielectric 308 is connected with the third metal 304 and the fifth metal 310 in a pressing or double-sided conductive adhesive manner.
Fig. 4 is a schematic diagram of an assembled transmission line according to the above embodiment. In addition, the first metal layer D1 includes a first signal island 510 and a second signal island 520, the first signal island 510 and the second signal island 520 are respectively disposed at two ends of the first metal layer D1, and are connected to signal lines disposed in the second metal layer 305 through a plurality of metalized through vias, so as to lead out the signal lines disposed in the second metal layer 305 to the signal islands, thereby implementing a signal transmission function.
In some embodiments as shown in fig. 5, the second metal 303, the third metal 304, the first medium 306, the third medium 308, the fourth metal 309 and the fifth metal 310 may be discontinuous segment structures, which can save cost, increase air gap, increase contact area with air, and reduce dielectric constant and loss factor, thereby reducing signal loss.
In some embodiments, the second metal layer 305 may include a plurality of signal lines, while transmitting multiple signals. In the specific embodiment shown in fig. 6, two signal lines are disposed on the second metal layer 305, so that two signals can be simultaneously transmitted.
Note that, in some embodiments, as shown in fig. 7, the first metal layer D1 and the third metal layer D3 are single metal structures; the first metal layer D1 includes a first metal 302, and the third metal layer D3 includes a sixth metal 311. The first dielectric 306 and the third dielectric 308, which are respectively connected to the first metal 302 and the sixth metal 311, act as a support between the first metal layer D1 and the third metal layer D3, thereby creating a condition for the existence of the air gap 314.
The low-loss transmission line provided by the above embodiment can be directly used for assembling and forming a low-loss transmission line device during signal transmission. An embodiment provides a low loss transmission device, including: at least three metal layers and at least three dielectrics; the at least three metal layers comprise a first metal layer, a second metal layer and a third metal layer; the at least three layers of media include a first media, a second media, and a third media; the second medium and the second metal layer form a transmission layer; the second metal layer comprises at least one signal wire for transmitting signals; the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer; an air gap is formed among the first metal layer, the third metal layer, the first medium and the third medium.
Wherein the second medium and the second metal layer form a transmission layer; the transmission layer is arranged in the air gap and is connected with the first metal layer in a pressing mode.
The first metal layer comprises a first metal, a second metal and a third metal, and the first metal is respectively connected with the second metal and the third metal; the third metal layer comprises a fourth metal, a fifth metal and a sixth metal, and the sixth metal is respectively connected with the fourth metal and the fifth metal; the connection mode comprises welding and double-sided conductive adhesive. Wherein the first metal layer comprises a first signal island and a second signal island; the first signal island and the second signal island are respectively arranged at two ends of the first metal layer and are connected with signal lines arranged in the second metal layer through a plurality of metallized through holes.
In some optional embodiments, the third dielectric further includes a plurality of metalized through vias, and the plurality of metalized through vias connect the third metal layer and the first metal layer.
In some optional embodiments, the material of the at least three layers of dielectric is one of a high frequency plate, a carrier-like plate, a ceramic plate, or a combination thereof.
In some optional embodiments, the low-loss transmission line device provided in this embodiment further includes a fourth dielectric and a fifth dielectric, a bottom surface of the fourth dielectric is connected to the top surface of the first metal layer, and a top surface of the fifth dielectric is connected to the bottom surface of the third metal layer. And the connection mode of the fourth medium and the first metal layer and the connection mode of the fifth medium and the third metal layer are both in press fit connection.
In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A low loss transmission line, comprising: at least three metal layers and at least three dielectrics;
the at least three metal layers comprise a first metal layer, a second metal layer and a third metal layer;
the at least three layers of media include a first media, a second media, and a third media; the second medium and the second metal layer form a transmission layer; the second metal layer comprises at least one signal wire for transmitting signals;
the upper surface and the lower surface of the first medium are respectively connected with one side of the first metal layer and one side of the third metal layer; the upper surface and the lower surface of the third medium are respectively connected with the other sides of the first metal layer and the third metal layer;
and an air gap is formed among the first metal layer, the third metal layer, the first medium and the third medium.
2. The low loss transmission line according to claim 1, wherein said transmission layer is disposed in said air gap and is connected to said first metal layer.
3. The low loss transmission line according to claim 1, wherein the first metal layer comprises a first metal, a second metal and a third metal, the first metal being connected to the second metal and the third metal, respectively;
the third metal layer comprises a fourth metal, a fifth metal and a sixth metal, and the sixth metal is respectively connected with the fourth metal and the fifth metal; the connection mode comprises welding and double-sided conductive adhesive.
4. The low loss transmission line of claim 1, further comprising a plurality of metalized through vias on said third dielectric, said plurality of metalized through vias connecting said first metal layer and said third metal layer.
5. The low loss transmission line of claim 4, wherein said first metal layer comprises a first signal island and a second signal island; the first signal island and the second signal island are respectively arranged at two ends of the first metal layer and are connected with signal lines arranged in the second metal layer through the plurality of metalized through holes.
6. The low loss transmission line according to claim 1, wherein the material of said at least three layers of dielectric is one of a high frequency board, a carrier-like board, a ceramic board or a combination thereof.
7. The low loss transmission line according to claim 1 further comprising a fourth dielectric and a fifth dielectric, a bottom surface of said fourth dielectric being connected to said first metal layer top surface and a top surface of said fifth dielectric being connected to said third metal layer bottom surface.
8. The low loss transmission line according to claim 7, wherein the fourth dielectric is connected to the first metal layer and the fifth dielectric is connected to the third metal layer by a press-fit connection.
9. The low loss transmission line of claim 1, wherein the transmission layer is laminated to the first metal layer.
10. A low loss transmission apparatus comprising a low loss transmission line as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921442689.8U CN210271842U (en) | 2019-09-02 | 2019-09-02 | Low loss transmission line and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921442689.8U CN210271842U (en) | 2019-09-02 | 2019-09-02 | Low loss transmission line and apparatus |
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| Publication Number | Publication Date |
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| CN210271842U true CN210271842U (en) | 2020-04-07 |
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| CN201921442689.8U Active CN210271842U (en) | 2019-09-02 | 2019-09-02 | Low loss transmission line and apparatus |
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| CN (1) | CN210271842U (en) |
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- 2019-09-02 CN CN201921442689.8U patent/CN210271842U/en active Active
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