阅读说明：本技术 具有滤波功能的传输线 (Transmission line with filtering function ) 是由 谢旻峻 赖瑞宏 于 2019-06-11 设计创作，主要内容包括：本发明提供一种具有滤波功能的传输线,包括：第一电连接部、第二电连接部、导线及滤波装置。第一电连接部用以容置第一端子,并通过第一端子接收第一电信号。导线连接于第一端子及第二电连接部之间。滤波装置设置于第一电连接部,电性连接于第一端子及导线。滤波装置对第一电信号进行滤波操作以提供第二电信号,并将第二电信号通过导线传送至第二电连接部。(The present invention provides a transmission line with a filtering function, comprising: the first electric connection part, the second electric connection part, the conducting wire and the filter device. The first electric connection part is used for accommodating the first terminal and receiving a first electric signal through the first terminal. The wire is connected between the first terminal and the second electric connection part. The filtering device is arranged on the first electric connection part and is electrically connected with the first terminal and the lead. The filtering device filters the first electric signal to provide a second electric signal and transmits the second electric signal to the second electric connection part through the lead.)

1. A transmission line with filtering, comprising:

the first electric connection part is used for accommodating at least one first terminal and receiving a first electric signal through the at least one first terminal;

a second electrical connection portion;

at least one wire, wherein each wire is connected between one of the at least one first terminal and the second electrical connection portion; and

the filtering device is arranged on the first electric connection part and is electrically connected with each first terminal and each lead, wherein the filtering device performs filtering operation on the first electric signal to provide a second electric signal, and the second electric signal is transmitted to the second electric connection part through the at least one lead.

2. The transmission line according to claim 1, wherein the filtering means comprise a microstrip-line form filter connected to the at least one first terminal.

3. The transmission line of claim 2, wherein the filtering device comprises a capacitor portion and an inductor portion connected in series, the first electrical connection portion receives the first electrical signal through the at least one first terminal, and the filtering device performs the filtering operation on the first electrical signal through the capacitor portion and the inductor portion to provide the second electrical signal.

4. The transmission line of claim 1, wherein the filtering means suppresses noise in the first electrical signal by the filtering operation to provide the second electrical signal.

5. The transmission line according to claim 1, wherein the filtering means includes a plurality of microstrip line form filters connected to the at least one first terminal, the first electrical connection portion receives the first electrical signal through the at least one first terminal, and the filtering means performs the filtering operation on the first electrical signal through the plurality of microstrip line form filters to suppress a plurality of noises in the first electrical signal and provide the second electrical signal.

6. The transmission line of claim 1, wherein the first electrical signal comprises a differential mode signal and a common mode signal, and the filtering device further comprises:

and a coupling element electrically connected to the at least one first terminal, wherein the common mode signal is coupled to the coupling element by a coupling method.

7. The transmission line of claim 6, wherein the filtering means filters out the common mode signal by the filtering operation to provide the second electrical signal comprising only the differential mode signal.

8. The transmission line of claim 1, wherein said first electrical connection is connected to an electronic component and receives said first electrical signal from said electronic component.

9. The transmission line of claim 8, wherein the electronic component includes a panel and the second connector is connected to a motherboard.

Technical Field

The present invention relates to transmission lines, and particularly to a transmission line with a filtering function.

Background

In the prior art, transmission lines are often used to connect between different electronic components and to transmit electrical signals between these electronic components. In some applications, an electronic component may transmit noise in addition to transmitting an electrical signal to another electronic component through a transmission line. Since the conventional transmission line does not have the capability of suppressing noise, a specific noise suppression element must be usually disposed on the electronic component to prevent the transmission performance of the electrical signal from being affected by noise.

Taking the transmission line connected between the motherboard and the panel as an example, since it does not have the capability of suppressing noise, the motherboard needs to be provided with an inductor/capacitor filter for preventing the noise from the motherboard from being transmitted to the panel through the transmission line. However, this method cannot prevent noise from the panel from being transmitted to the main board.

Therefore, it is necessary for those skilled in the art to design a transmission line with filtering function to effectively improve the above problems.

Disclosure of Invention

The present invention provides a transmission line with filtering function, which can solve the above technical problems.

The present invention provides a transmission line with a filtering function, comprising: the first electric connection part, the second electric connection part, at least one lead and a filter device. The first electric connection part is used for accommodating at least one first terminal and receiving a first electric signal through the at least one first terminal. Each wire is connected between one of the at least one first terminal and the second electrical connection portion. The filtering device is arranged on the first electric connection part and is electrically connected with each first terminal and each lead. The filtering device performs a filtering operation on the first electric signal to provide a second electric signal, and transmits the second electric signal to the second electric connection part through at least one wire.

Based on the above, the transmission line provided by the present invention may perform a filtering operation on the received first electrical signal through the filtering device disposed therein, so as to achieve an effect of suppressing/filtering a specific component (e.g., noise) in the first electrical signal.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of a transmission line according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a transmission line structure according to an embodiment of the present invention;

FIG. 3A is a graph of the performance of filtering by placing capacitors;

FIG. 3B is a graph of the performance of filtering by placing a capacitor and an inductor in series;

FIG. 3C is a graph of the performance of filtering by the embodiment of FIG. 2;

FIG. 4A is a diagram of transmission line performance without a filter device;

FIG. 4B is a graph of transmission line performance for implementing a filtering function using the transmission line of FIG. 2;

FIG. 5A is a diagram of transmission line performance without a filter device;

FIG. 5B is a graph of transmission line performance for implementing a filtering function using the transmission line of FIG. 2;

FIG. 6 is a partial block diagram of a transmission line according to the embodiment of FIG. 2;

FIG. 7A is a diagram of transmission line performance without a filter device;

fig. 7B is a graph of transmission line performance for implementing a filtering function using the transmission line of fig. 6;

fig. 8 is a graph of transmission line performance with multiple filtering devices connected to a first terminal in a single terminal pair;

FIG. 9 is a schematic diagram of a transmission line according to an embodiment of the present invention;

FIG. 10A is a diagram illustrating a transmission line structure according to an embodiment of the present invention;

FIG. 10B is a perspective view of the first electrical connection shown in accordance with FIG. 10A;

FIG. 11A is a graph of the differential mode performance of the transmission line according to FIGS. 10A and 10B;

fig. 11B is a graph of the transmission line common mode performance according to fig. 10A and 10B.

The reference numbers illustrate:

100. 200, 600, 900, 1000: transmission line

110. 210, 910, 1010: first electric connection part

112. 212, 912a, 912b, 1012a, 1012 b: first terminal

114. 214, 614, 914, 1014: filter device

120. 220, 920, 1020: second electric connection part

122. 222, 922a, 922b, 1022a, 1022 b: second terminal

130. 230, 930a, 930b, 1030a, 1030 b: conducting wire

214a, 614a, 10141 a: capacitor unit

214b, 614b, 10141 b: inductance part

10141: microstrip line type filter

10142: coupling element

1110. 1120, 1130, 1140: curve line

E1: first electric signal

E2: second electrical signal

Detailed Description

Fig. 1 is a schematic diagram of a transmission line according to an embodiment of the invention. In fig. 1, the transmission line 100 is, for example, a flat cable capable of being connected between electronic devices, and is used for transmitting signals such as SDIO and clock, but not limited thereto. As shown in fig. 1, the transmission line 100 may include a first electrical connection portion 110, a second electrical connection portion 120, a conductive line 130, and a filtering device 114.

In the present embodiment, each of the conductive wires 130 can be used to connect the first electrical connection portion 110 and the second electrical connection portion 120. More specifically, the first electrical connection portion 110 can be used for accommodating one or more first terminals (e.g., the first terminal 112), the second electrical connection portion 120 can be used for accommodating a second terminal corresponding to the first terminal (e.g., the second terminal 122 corresponding to the first terminal 112), and each of the wires 130 can be used for connecting the first terminal and the second terminal corresponding to each other. In the embodiment of the present invention, the first terminal and the second terminal are, for example, gold fingers known to those skilled in the art, but the present invention is not limited thereto.

For convenience of description, the first terminal and the second terminal corresponding to each other may be referred to as a terminal pair. Accordingly, the transmission line 100 of fig. 1 can be considered to include 5 terminal pairs, and the structure and operation of each terminal pair are the same. Therefore, the following description will be based on only a specific terminal pair consisting of the first terminal 112 and the second terminal 122, and those skilled in the art should be able to deduce the structure and operation of other terminal pairs.

In fig. 1, each terminal pair may be provided with a corresponding filter device 114. Taking the specific terminal pair as an example, the filter device 114 can be configured to be electrically connected to the first terminal 112 and the conducting wire 130. In an embodiment, the filtering device 114 may be connected to the first terminal 112, but the invention is not limited thereto.

In one embodiment, the transmission line 100 can be used to connect between two electronic components to suppress certain signal components (e.g., noise) from the electronic components connected to the first electrical connection 110 through a filtering device in each terminal pair. Taking the specific terminal pair as an example, when the first electrical connection portion 110 is connected to a first electronic component (e.g., a panel), the first electrical signal E1 from the first electronic component can be received through the first terminal 112. The filtering device 114 can then filter the first electrical signal E1 to provide a second electrical signal E2, and transmit the second electrical signal E2 to a second electrical connector 120 connected to a second electronic component (e.g., a motherboard) through a wire 130. More specifically, the second electrical signal E2 is transmitted to the second terminal 122 in the second electrical connection 120, although the invention may not be limited thereto. In other embodiments, the first electronic component may be a motherboard, and the second electronic component may be a panel or other device, depending on the user's needs. In addition, in some embodiments, the first electronic element and the second electronic element may be disposed in the first electronic device and the second electronic device, respectively. In this case, the first electronic element may be provided in a connection terminal of the first electronic device for connection with the second electronic element of the second electronic device.

In one embodiment, the filtering device 114 may suppress noise in the first electrical signal E1 through the above-mentioned filtering operation to provide the second electrical signal E2. Specifically, the designer may adjust the relevant resonance characteristics of the filtering device 114 to make the filtering device 114 have the characteristics of a low-pass, high-pass or band-rejection filter (stopband filter), so as to achieve the effect of suppressing the specific frequency component (e.g., noise) in the first electrical signal E1. Thus, the noise from the first electronic component (e.g., panel) is not transmitted to the second electronic component (e.g., motherboard) connected to the second electrical connector 120 through the transmission line 100.

Fig. 2 is a schematic diagram of a transmission line structure according to an embodiment of the invention. In the present embodiment, the transmission line 200 includes a first electrical connection portion 210, a second electrical connection portion 220, a conductive wire 230 and a filter 214.

As described in the previous embodiments, the transmission line 200 can be considered to include 5 terminal pairs, and the terminal pairs are configured with corresponding filtering devices. Taking the particular terminal pair comprising the first terminal 212 and the second terminal 222 as an example, it may be configured with a filtering device 214.

In the present embodiment, the filter device 214 is, for example, a microstrip filter connected to the first terminal 212, and may include a capacitor portion 214a and an inductor portion 214 b. It should be appreciated that the capacitive portion 214a and the inductive portion 214b can equivalently provide the structure of the capacitor and inductor functions, rather than the actual capacitor and inductor. In this case, when the first terminal 212 receives a first electrical signal from an electronic component, the filtering device 214 can perform a filtering operation on the first electrical signal through the capacitor portion 214a and the inductor portion 214b to provide a second electrical signal, and transmit the second electrical signal to the second terminal 222 through the conducting wire 230. In various embodiments, the patterns of the capacitor portion 214a and the inductor portion 214b may be designed correspondingly according to the specific frequency (e.g., noise) to be suppressed, and the pattern shown in fig. 2 may be used to suppress noise in the 2.4GHz band, for example, but the invention is not limited thereto.

In order to prove the technical effect of the transmission line of the present invention, the following is further explained based on the related experimental data.

Referring to fig. 3A, fig. 3B and fig. 3C, fig. 3A is a performance diagram of filtering performed by arranging a capacitor, fig. 3B is a performance diagram of filtering performed by arranging a capacitor and an inductor in series, and fig. 3C is a performance diagram of filtering performed by the embodiment of fig. 2.

In the context of fig. 3A, the filtering function is realized by a capacitor (and its parasitic inductance) having 12 pF. As shown in fig. 3A, S (1,1) (i.e., reflection coefficient) and S (2,1) (i.e., transmission coefficient) can achieve a larger bandwidth by using only capacitor for filtering, but the bandwidth cannot be controlled and may cause the undesirable result that the baseband signal is filtered out.

In the scenario of fig. 3B, the filtering function is realized by serially connecting a capacitor and an inductor. As shown in S (1,1) and S (2,1) of fig. 3B, the filtering function achieved by using the serially connected capacitor and inductor can achieve a controllable bandwidth. However, the capacitor and the inductor connected in series are too large in size, and thus are not suitable for being disposed in a general transmission line.

In the scenario of fig. 3C, the filtering function is realized by the filtering device 214 of fig. 2. As shown in S (1,1) and S (2,1) of fig. 3C, the filter 214 can control the bandwidth to a desired frequency band (e.g., 2.4GHz), and is also suitable for being disposed in a conventional transmission line.

In addition, the performance of the transmission line of the embodiment of the invention is not affected by the length. Referring to fig. 4A and 4B, fig. 4A is a transmission line performance diagram without a filter device, and fig. 4B is a transmission line performance diagram with the transmission line of fig. 2 for filtering. In the context of fig. 4A and 4B, the wire length employed is, for example, 70 mm.

As can be seen from S (1,1) and S (2,1) shown in fig. 4A, the transmission line without the filter device can hardly suppress any noise in the 2.4GHz band. On the other hand, as can be seen from S (1,1) and S (2,1) shown in fig. 4B, noise in the 2.4GHz band has been effectively suppressed.

Referring to fig. 5A and 5B, fig. 5A is a transmission line performance diagram without a filter device, and fig. 5B is a transmission line performance diagram with the transmission line of fig. 2 for filtering. In the context of fig. 5A and 5B, the wire length employed is, for example, 100 mm.

As can be seen from S (1,1) and S (2,1) shown in fig. 5A, the transmission line without the filter device can hardly suppress any noise in the 2.4GHz band. On the other hand, as can be seen from S (1,1) and S (2,1) shown in fig. 5B, the noise in the 2.4GHz band can be effectively suppressed. In other words, as can be seen from fig. 4B and 5B, the performance of the transmission line provided by the present invention is not affected by the length of the conductive line.

In addition, in order to confirm that the bandwidth of the transmission line of the present invention can be adjusted according to the requirement, the following is additionally described with reference to fig. 6, fig. 7A and fig. 7B.

Fig. 6 is a partial structure diagram of a transmission line according to the embodiment shown in fig. 2. In the present embodiment, the structure of the transmission line 600 is substantially the same as the transmission line 200 of fig. 2, but the patterns of the capacitor 614a and the inductor 614b in the filter 614 have been adjusted accordingly to the illustrated aspect according to the 900mhz frequency band under consideration, but the invention is not limited thereto.

Referring to fig. 7A and 7B, fig. 7A is a transmission line performance diagram without a filter device, and fig. 7B is a transmission line performance diagram for implementing a filtering function by using the transmission line of fig. 6.

As can be seen from S (1,1) and S (2,1) shown in fig. 7A, the transmission line without the filter device can hardly suppress any noise in the 900mhz band. On the other hand, as can be seen from S (1,1) and S (2,1) shown in fig. 7B, noise in the 900MHz band can be effectively suppressed. In other words, as can be seen from fig. 4B, fig. 5B and fig. 7B, the bandwidth of the transmission line of the present invention can be adjusted according to the requirement.

In some embodiments, for a single terminal pair, the invention can achieve the effect of simultaneously filtering out multiple frequency band signals in the first electrical signal by providing multiple filtering devices (i.e., microstrip line filters) connected to the first terminal.

Fig. 8 is a diagram of transmission line performance of a single terminal pair with a plurality of filter devices connected to a first terminal. In the present embodiment, it is assumed that a certain terminal pair of the transmission line of the present invention is provided with three microstrip line type filters connected to the first terminal, and each of the filters can be designed to suppress noise in the frequency bands of 850MHz, 1.940GHz, and 2.450 GHz. As can be seen from S (1,1) and S (2,1) in fig. 8, the transmission line of the present invention can achieve effective suppression of signals in the above frequency bands.

In other embodiments, for a transmission line that uses differential lines for transmission, the present invention also provides a scheme for providing a filtering function by disposing a filtering device therein. As will be further explained below.

Fig. 9 is a schematic diagram of a transmission line according to an embodiment of the invention. In fig. 9, a transmission line 900 is, for example, a flat cable that can be connected between electronic components and can be used for transmitting signals such as PCIe, USB, EDP, and MIPI. As shown in fig. 9, the transmission line 900 may include a first electrical connection portion 910, a second electrical connection portion 920, conductive wires 930a and 930b, and a filter 914.

In this embodiment, the conductive wires 930a and 930b can form a differential wire pair and can be used for transmitting differential signals between the first electrical connection portion 910 and the second electrical connection portion 920. As shown in fig. 9, the first terminals in the first electrical connection 910 may be arranged in pairs and may be connected to the second electrical connection 920 through respective pairs of differential wires. For example, the first terminals 912a and 912b of the first electrical connection portion 910 are connected to the second terminals 922a and 922b of the second electrical connection portion 920 through wires 930a and 930b, respectively.

For ease of description, the first terminal and the second terminal connected by the differential pair of terminals may be referred to as a differential pair of terminals instead. It can be seen that the transmission line 900 of fig. 9 can be considered to include 5 differential terminal pairs, and the structure and operation of each differential terminal pair are the same. Therefore, the following description will be based on only a specific differential terminal pair consisting of the first terminals 912a, 912b and the second terminals 922a and 922b, and those skilled in the art should be able to deduce the structure and operation of other differential terminal pairs.

In fig. 9, each differential terminal pair may be provided with a corresponding filter device. Taking the specific differential terminal pair as an example, the filter 914 electrically connected to the first terminals 912a, 912b and the conductive wires 930a and 930b may be disposed. In one embodiment, the filter 914 may be connected to the first terminals 912a and 912b, but the invention is not limited thereto.

In one embodiment, the transmission line 900 may be used to connect between two electronic components to suppress certain signal components (e.g., noise) from the electronic components connected to the first electrical connection 910 through a filtering device in each differential terminal pair. Taking the specific differential terminal pair as an example, when the first electrical connection portion 910 is connected to a first electronic component (e.g., a panel), the first electrical signal E1 from the first electronic component can be received through the first terminals 912a and 912 b. The filter 914 can then filter the first electrical signal E1 to provide a second electrical signal E2, and transmit the second electrical signal E2 to a second electrical connector 920 connected to a second electronic component (e.g., a motherboard) via wires 930a and 930 b. More specifically, the second electrical signal E2 is transmitted to the second terminals 922a and 922b in the second electrical connection 920, although the invention may not be limited thereto.

In one embodiment, the filtering device 914 can suppress noise in the first electrical signal E1 through the above-mentioned filtering operation to provide the second electrical signal E2. For example, the first electrical signal E1 in the present embodiment may include a differential mode signal and a common mode signal, and the common mode signal may be regarded as noise in the first electrical signal E1 and may be suppressed/filtered by the filtering device 914. Specifically, the designer can adjust the relevant resonance characteristics of the filter 914 to make the filter 914 have the characteristics of a low-pass, high-pass or band-reject filter, so as to achieve the effect of suppressing the specific frequency component (e.g. noise) in the first electrical signal E1. Thus, the noise from the first electronic component (e.g., panel) is not transmitted to the second electronic component (e.g., motherboard) connected to the second electrical connection portion 920 through the transmission line 900.

Referring to fig. 10A and 10B, fig. 10A is a structure diagram of a transmission line according to an embodiment of the invention, and fig. 10B is a perspective view of a first electrical connection portion shown in fig. 10A. In this embodiment, the transmission line 1000 includes a first electrical connection 1010, a second electrical connection 1020, wires 1030a, 1030b, and a filtering device 1014.

As described in the previous embodiments, the transmission line 1000 may be considered to include 5 differential terminal pairs, and each of the differential terminal pairs is configured with a corresponding filtering device. Taking the particular differential terminal pair comprising first terminals 1012a, 1012b, second terminals 1022a and 1022b as an example, it may be configured with a filtering device 1014.

In the present embodiment, the filtering device 1014 may include a microstrip filter 10141 and a coupling element 10142, wherein the microstrip filter 10141 may be connected to the first terminals 1012a and 1012b, and may include a capacitor 10141a and an inductor 10141 b. The coupling element 10142 may be electrically connected to the first terminals 1012a and 1012 b. In this case, when the first terminals 1012a and 1012b receive a first electrical signal (which includes, for example, a differential mode signal and a common mode signal) from an electronic element, the filtering device 1014 can couple the common mode signal to the coupling element 10142 by way of coupling. The filtering device 1014 may then perform a filtering operation through the capacitor portion 10141a and the inductor portion 10141b to provide a second electrical signal. More specifically, the filtering device 1014 may filter out the common mode signal by the filtering operation described above to provide the second electrical signal comprising only the differential mode signal. The filtering device 1014 may then transmit this second electrical signal to the second terminals 1022a and 1022b over the wires 1030a and 1030 b.

In various embodiments, the patterns of the capacitor portion 10141a and the inductor portion 10141B may be designed accordingly according to a specific frequency (e.g., noise) to be suppressed, and the pattern shown in fig. 10B may be used to suppress noise in the 2.4GHz band, for example, but the invention is not limited thereto.

In order to prove the technical effect of the transmission line of the present invention, the following is further explained based on the related experimental data. Fig. 11A is a diagram illustrating differential mode performance of transmission lines according to fig. 10A and 10B. In the present embodiment, the curve 1110 is, for example, an S21dd curve (i.e., differential mode attenuation) when the filter 1014 is provided in the transmission line 1000, and the curve 1120 is, for example, an S21dd curve when the filter of the present invention is not provided in the transmission line.

As shown in fig. 11A, the attenuation exhibited by the curve 1110 is substantially no higher than that exhibited by the curve 1120, which is sufficient for the transmission line 1000 of the present invention to maintain (or even improve) the transmission performance of the differential mode signal.

Referring to fig. 11B, a common mode performance diagram of the transmission lines shown in fig. 10A and 10B is shown. In the present embodiment, the curve 1130 is, for example, an S21cc curve (i.e., common mode attenuation) when the filter 1014 is disposed in the transmission line 1000, and the curve 1140 is, for example, an S21cc curve when the filter of the present invention is not disposed in the transmission line.

As can be seen from fig. 11B, the curve 1130 exhibits a significant attenuation at 2.4GHz (i.e., at the beginning of the dashed line), compared to the curve 1140, which is sufficient for the transmission line 1000 proposed by the present invention to suppress noise (i.e., common mode signal) in the 2.4GHz band.

In summary, the transmission line provided by the present invention may perform a filtering operation on the received first electrical signal through a filtering device (e.g., a microstrip line filter) disposed therein, so as to achieve an effect of suppressing/filtering a specific component (e.g., noise) in the first electrical signal. In addition, for a transmission line that transmits using differential lines, the present invention also proposes a scheme that provides a filtering function by disposing therein a filtering device (which includes, for example, a coupling element and a filter in the form of a microstrip line).

Therefore, the noise from the first electronic component (for example, a panel) connected to the first electrical connection portion is not transmitted to the second electronic component (for example, a motherboard) connected to the second electrical connection portion through the transmission line of the present invention.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.