CN202652178U - Network signal coupling circuit - Google Patents
Network signal coupling circuit Download PDFInfo
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- CN202652178U CN202652178U CN 201220204033 CN201220204033U CN202652178U CN 202652178 U CN202652178 U CN 202652178U CN 201220204033 CN201220204033 CN 201220204033 CN 201220204033 U CN201220204033 U CN 201220204033U CN 202652178 U CN202652178 U CN 202652178U
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Abstract
The utility model discloses a network signal coupling circuit which is arranged on a circuit board, and the two terminals of the network signal coupling circuit are connected with a network connector and a network chip respectively. The signal coupling circuit is provided with two or more channels, and each channel is provided with two circuits. The two terminals of each channel are provided with a first connecting terminal which is connected with the network connector and a second connecting terminal which is connected with the network chip. One or more channels are connected with coupling modules. Each coupling module is provided with a first capacitor and a second capacitor which are connected in series with the circuits of the channel respectively. The two terminals of the first capacitor and the two terminals of the second capacitor are connected in parallel with a first equivalent resistor, a second equivalent resistor, a third equivalent resistor, and a fourth equivalent resistor respectively. The other terminal of each equivalent resistor is connected with the ground. The other terminals of the equivalent resistors are connected with signal equivalent grounding terminals. The capacitance signal coupling intensity increases along with the increase of the frequency, so the network signal coupling circuit has the excellent network signal coupling effect under the high network frequency, and consequently the signal coupling effect is improved.
Description
Technical field
The utility model relates to a kind of network signal coupling circuit, espespecially be connected with in the signal coupling circuit of network connector and network chip, be provided with respectively coupling module in one or more passage, coupling module is in series with respectively electric capacity with two circuit, electric capacity two ends then are parallel with again signal equivalence ground connection of equivalent resistance, by this to promote the signal coupling effect.
Background technology
The now fast development of computer technology, and desktop computer or notebook computer general be present in each corner in the society, its computer development trend is also strong towards calculation function, speed reaches soon the little direction of volume and strides forward, because during network communications technology is also rapidly flourish, and people are lived, study, work is brought another different brand-new boundary in the past into leisure, make between men and can mutually transmit required real time information by network communication, advertising or contact mail etc., utilize simultaneously the various information of Web search, instant messaging or online game etc. make people more fervent and inseparable with the network Relations Among.
But the part of network is come the transmission of data for having with cable connection and two kinds of modes of wireless transmission, the cable interconnection technique just need be equiped with network connector, the legacy network connector is for having transformer module and common mode inhibition module, see also shown in Figure 5, the way of general manufacturer is that transformation coil B and filter coil C are installed on the circuit board A, and transformation coil B and filter coil C are arranged with wire D1 on core D, the joint of wire D1 end is the contact that is welded in circuit board A, because coil needs to cause production efficiency low with manual the winding, more can't automated production, coil also ruptures easily and allows cost improve, and what twine is tight, distance, the differences such as the number of turns also can impact effect, and causes product quality very different.
Moreover, along with the utilization of network is more and more wider, the data capacity of transmission over networks is also increasing, and network vendors is just drawn high the speed of Internet Transmission for the demand that satisfies the user always, from 10Mbps to 100Mbps or 1Gbps, even the present fiber optic network transmission speed of releasing can reach more than the 10Gbps, yet transformation coil B is inductance, and the impedance of inductance (Z) is referred to as induction reactance, its unit is ohm (Ω), and the formula of induction reactance is:
Z＝2π＊f＊L
F is frequency in the above-mentioned formula, and unit is hertz (Hz); L is the sense value of inductance, unit is Henry (H), because network connector is to utilize the inductance characteristic of transformation coil B to isolate electric and coupled signal, so in order to allow signal be delivered to secondary side by primary side, must allow transformation coil B have predetermined sense value, can be learnt by above-mentioned formula, induction reactance is directly proportional with operating frequency and inductance sense value, so under the situation that signal frequency increases, its induction reactance also can increase thereupon and (sees also shown in Figure 6, it is the frequency of 350 μ H electric capacity and the comparison diagram of induction reactance), but increasing, induction reactance can allow the decay of signal become large, so can produce the slack-off disappearance of network outage or network transfer speeds, please consult simultaneously shown in Figure 7ly, from figure, can learn, when the insertion loss of transformer be-during 3db, frequency response is about 0.45NHz～240MHz, because can allow insertion loss increase fast when surpassing, so the operating frequency of transformer can only be in specific narrower frequency range; In addition, because the characteristic of transformation coil B is by low frequency low-intensity, medium frequency high strength and the formed curve of high-frequency low-intensity, so, can allow on the contrary the signal strength signal intensity of transformation coil B reduce, and be difficult for reaching the requirement that meets product during up to 1Gbps in network transfer speeds.
Therefore, how to solve that existing transformation coil quality is bad, cost is high, can't automated production and when high network transfer speeds problem and the disappearance of strength decreased, be the direction place person that the relevant manufacturer that is engaged in the industry desires most ardently the research improvement.
Summary of the invention
The purpose of this utility model is to solve above-mentioned the deficiencies in the prior art, a kind of networking signal coupling circuit is proposed, the characteristic that this signal coupling circuit utilizes the capacitance signal stiffness of coupling to increase simultaneously with the frequency raising, its use network signal coupling effect of electric capacity when the high-frequency network also can be improved, and then can promote the coupling effect of signal.In addition, because the overall network signal coupling circuit has only used general electric capacity and the passive device that directly is welded on the circuit board, but so just automated production of product, and electric capacity and passive device can be done quality management when stocking up, allow quality maintain in the standard of non-defective unit, and then can reach the purpose of improving product quality, speed of production.
A kind of network signal coupling circuit that the utility model proposes is to be arranged on the circuit board of tool network chip, and circuit board again device connected to the network be electrically connected signal coupling circuit so that signal is coupled, wherein:
Described signal coupling circuit is provided with two of tool two circuit respectively or two with upper channel, two or two the first links that have respectively the interconnection network connector with upper channel two ends, the second link of interconnection network chip, one of them or more than one passage are provided with respectively coupling module, coupling module is connected respectively with two circuit of passage and is provided with the first electric capacity and the second electric capacity, and contiguous the second link one side of the first electric capacity and the second electric capacity respectively parallel connection is provided with the first equivalent resistance and the second equivalent resistance, and contiguous the first link one side of each first electric capacity and the second electric capacity respectively parallel connection is provided with C grade effect resistance and fourth class effect resistance, and being connected in simultaneously signal equivalence earth terminal in each first equivalent resistance and the second equivalent resistance another end, each C grade effect resistance then is connected in the equivalent earth terminal of another signal simultaneously with fourth class effect resistance another end.
A kind of network signal coupling circuit that the utility model proposes, wherein, two of connecting of described the first link or two are provided with respectively filtration module with upper channel and coupling module is connected to the second link, and filtration module is in series with respectively the first coil and the second coil with two circuit of each passage.
A kind of network signal coupling circuit that the utility model proposes, wherein, described two or two form π shape loop with the electric capacity of upper channel institute each circuit of tool and the equivalent resistance of two end parallel connections thereof, and the π shape loop of two circuit is for being symmetrical shape, the equivalent resistance of the electric capacity two end parallel connections of two circuit, wherein the signal equivalence earth terminal that connects simultaneously of two of the adjacent network chip equivalent resistance another ends is earth terminal, and the signal equivalence earth terminal that two equivalent resistance another ends of adjacent network connector connect simultaneously is supply power voltage.
A kind of network signal coupling circuit that the utility model proposes, wherein, described electric capacity and two end equivalent resistances mate, and the electric capacity after the coupling is 0.1 μ farad, the equivalent resistance of electric capacity adjacent network chip one side is 49.9 ohm, and the in addition side equivalent resistance of adjacent network connector is 75 ohm.
A kind of network signal coupling circuit that the utility model proposes is to be arranged on the network connector internal circuit board, and network connector is electrically connected signal coupling circuit so that signal is coupled with network chip again, wherein:
Described signal coupling circuit is provided with two of tool two circuit respectively or two with upper channel, two or two the first links that have respectively the interconnection network connector with upper channel two ends, the second link of interconnection network chip, one or more passage is provided with respectively coupling module, coupling module is connected respectively with two circuit of passage and is provided with the first electric capacity and the second electric capacity, and contiguous the second link one side of the first electric capacity and the second electric capacity respectively parallel connection is provided with the first equivalent resistance and the second equivalent resistance, and contiguous the first link one side of each first electric capacity and the second electric capacity respectively parallel connection is provided with C grade effect resistance and fourth class effect resistance, and being connected in simultaneously signal equivalence earth terminal in each first equivalent resistance and the second equivalent resistance another end, each C grade effect resistance then is connected in the equivalent earth terminal of another signal simultaneously with fourth class effect resistance another end.
A kind of network signal coupling circuit that the utility model proposes, wherein, two of connecting of described the first link or two are provided with respectively filtration module with upper channel and coupling module is connected to the second link, and filtration module is in series with respectively the first coil and the second coil with two circuit of each passage.
A kind of network signal coupling circuit that the utility model proposes, wherein, described two or two form π shape loop with the electric capacity of upper channel institute each circuit of tool and the equivalent resistance of two end parallel connections thereof, and the π shape loop of two circuit is for being symmetrical shape, the equivalent resistance of the electric capacity two end parallel connections of two circuit, wherein the signal equivalence earth terminal that connects simultaneously of two of the adjacent network chip equivalent resistance another ends is earth terminal, and the signal equivalence earth terminal that two equivalent resistance another ends of adjacent network connector connect simultaneously is supply power voltage.
A kind of network signal coupling circuit that the utility model proposes, wherein, described electric capacity and two end equivalent resistances are for mating, and the electric capacity after the coupling is 0.1 μ farad, the equivalent resistance of electric capacity adjacent network chip one side is 49.9 ohm, and the in addition side equivalent resistance of adjacent network connector is 75 ohm.
The beneficial effects of the utility model are, the network signal coupling circuit that provides by the utility model, overcome that transformation coil quality is bad in the prior art, cost is high, can't automated production and when high network transfer speeds the problem and blemish of strength decreased, design by coupling circuit, utilize the electric capacity characteristic that its signal coupling intensity also can increase thereupon under the higher state of frequency, when making network higher, the network signal coupling effect of electric capacity also improves thereupon.In addition, what the network signal coupling circuit that the utility model provides used is general electronic component finished product, must manually not wind the line, but directly be welded on the circuit board, thus can do automated production, and the quality of product can be guaranteed.
Description of drawings
Fig. 1 is calcspar of the present utility model.
Fig. 2 is the circuit diagram of the utility model signal coupling circuit.
Fig. 3 is the comparison diagram of frequency and capacitive reactance.
Fig. 4 is the calcspar of another embodiment of the utility model.
Fig. 5 is the stereo appearance figure of prior art.
Fig. 6 is the comparison diagram of frequency and induction reactance.
Fig. 7 is the frequency response chart of existing transformer.
Description of reference numerals:
The 1-signal coupling circuit; 10-the first link; 142-the second electric capacity; 11-the second link; 143-the first equivalent resistance; The 12-passage; 144-the second equivalent resistance; The 13-filtration module; 145-C grade effect resistance; 131-the first coil; 146-fourth class effect resistance; 132-the second coil; 147-signal equivalence earth terminal; The 14-coupling module; The 1471-earth terminal; 141-the first electric capacity; The 1472-supply power voltage; The 2-network connector; The 3-network chip; The 4-circuit board; The A-circuit board; B-transformation coil; The C-filter coil; The D-core; The D1-wire.
Embodiment
For reaching above-mentioned purpose and effect, the technological means that the utility model adopts and structure thereof, hereby drawing illustrates in detail that with regard to preferred embodiment of the present utility model its features and functions is as follows, in order to understanding fully.
See also Fig. 1,2, shown in 3, be calcspar of the present utility model, the circuit diagram of signal coupling circuit, the comparison diagram of frequency and capacitive reactance, find out this network signal coupling circuit by knowing shown in the figure, for being arranged on the circuit board 4 and two ends are connected with respectively in the signal coupling circuit 1 of network connector 2 and network chip 3, its signal coupling circuit 1 is for being provided with two of tool two circuit respectively or two with upper channel 12, and two or two the first links 10 that have respectively interconnection network connector 2 with upper channel 12 2 ends, the second link 11 of interconnection network chip 3, one or more passages 12 that the first link 10 connects are connected to the second link 11 for being provided with respectively filtration module 13 and coupling module 14, its filtration module 13 is provided with the first coil 131 and the second coil 132 for connecting respectively with two circuit of each passage, 14 each circuit with two passages of coupling module are connected respectively and are provided with the first electric capacity 141 and the second electric capacity 142, and contiguous the second link 11 1 sides of the first electric capacity 141 and the second electric capacity 142 are provided with the first equivalent resistance 143 and the second equivalent resistance 144 for parallel connection respectively, and each first electric capacity 141 and the second electric capacity 142 contiguous the first link 10 1 sides are provided with C grade effect resistance 145 for parallel connection respectively and the fourth class is imitated resistance 146, and being connected in simultaneously signal equivalence earth terminal 147 in each first equivalent resistance 143 and the second equivalent resistance 144 another ends, each C grade effect resistance 145 then is connected in the equivalent earth terminal 147 of another signal simultaneously with fourth class effect resistance 146 another ends.
The first coil 131 that above-mentioned two circuit 121 are connected with respectively and the second coil 132, adjacent one another are to carry out the signal filtering processing, wherein this first electric capacity 141 is imitated resistance 145 in the C grade that contiguous the first link 10 1 ends connect, the signal equivalence earth terminal 147 that its another end is electrically connected is earth terminal 1471, and the first equivalent resistance 143 that contiguous the second link 11 1 ends connect, the signal equivalence earth terminal 147 that its another end is electrically connected is supply power voltage 1472, the fourth class effect resistance 146 that this second electric capacity 142 connects in contiguous the first link 10 1 ends, the signal equivalence earth terminal 147 that its another end is electrically connected is earth terminal 1471, and the second equivalent resistance 144 that contiguous the second link 11 1 ends connect, the signal equivalence earth terminal 147 that its another end is electrically connected is supply power voltage 1472, be connected to again supply power voltage 1472 after its first equivalent resistance 143 and the second equivalent resistance 144 another ends can be connected, and C grade effect resistance 145 and fourth class effect resistance 146 another ends are connected to earth terminal 1471 after can being connected again.
This signal coupling circuit 1 is for being electrically connected at each terminal of network connector 2 with the first link 10, and signal coupling circuit 1 is for being electrically connected at a plurality of pins of network chip 3 with the second link 11, its two or two with each circuit of upper channel 12 for connecting respectively MD0+ and MX0+, MD0-and MX0-, MD1+ and MX1+, MD1-and MX1-, MD2+ and MX2+, MD2-and MX2-, MD3+ and MX3+, MD3-and MX3-, the visual actual design demand conversion of its position, non-so namely limit to claim of the present utility model.
Above-mentioned coupling module 14 is to form π shape loop (such as the first electric capacity 141 with the equivalent resistance of electric capacity and two ends thereof, the first equivalent resistance 143 and C grade effect resistance 145, or second electric capacity 142, the second equivalent resistance 144 and fourth class effect resistance 146), and the π shape loop of each passage two circuit 121 is for being symmetrical shape, it mainly is the tolerant two terminal circuit coupling of electricity consumption, recycle two ends respectively in parallel equivalent resistance carry out impedance matching, to meet the demand of different environments for use, the first electric capacity 141 after its coupling, the second electric capacity 142 is 0.1 μ farad (F), the first equivalent resistance 143 of electric capacity adjacent network chip 3 one sides and the second equivalent resistance 144 are 49.9 ohm (Ω), in addition side the first electric capacity 141 and second electric capacity 142 of adjacent network connector 2 are 75 ohm (Ω), the impedance of its electric capacity (Z) is called capacitive reactance, its unit is ohm (Ω), and the formula of capacitive reactance is:
Z＝1/（2π＊f＊C）
F is frequency in the above-mentioned formula, and unit is hertz (Hz); C is the appearance value of electric capacity, unit is farad (F), owing to be to utilize the characteristic of electric capacity to isolate electric and coupled signal, can be learnt by above-mentioned formula, capacitive reactance and operating frequency and capacitor's capacity are inversely proportional to, so under the situation that signal frequency increases, its capacitive reactance meeting reduces (to see also shown in Figure 3 thereupon, be the frequency of 0.01 μ F electric capacity and the comparison diagram of capacitive reactance), then the decay of signal also can diminish, just can have good network connectivity and signaling rate also can accelerate, owing to utilized the electric capacity characteristic that its characteristic also can increase under the higher state of frequency thereupon, in the situation (greater than 1Gbps) that network (frequency range) is more and more higher now, allow the direct current formation electric field induction of electric capacity utilization isolation computer make signal coupling, and the characteristic of electric capacity also can allow the coupling effect of high frequency network signal improve thereupon.
Moreover, see also Fig. 1, shown in Figure 4, be the calcspar of calcspar of the present utility model, another embodiment, by knowing the circuit board 4 of finding out that this signal coupling circuit 1 arranges shown in the figure, can directly be provided with network chip 3, a plurality of terminals of device 2 connected to the network are electrically connected again; And the circuit board 4 that signal coupling circuit 1 arranges also can be arranged at network connector 2 inside, again network connector 2 is electrically connected at the external circuit board, and with the external circuit board on the network chip 3 that arranges form and be electrically connected, its only tool the signal that transmits between network connector 2 and the network chip 3 is coupled and the function of filtering gets final product, in addition, it is that 10Mbps is during to 100Mbps that its signal coupling circuit 1 is used in network transfer speeds, its signal coupling circuit 1 only need have two passages 12, and signal coupling circuit 1 is used in network transfer speeds greater than 100Mbps(such as 1Gbps or 10Gbps) time, 1 need of its signal coupling circuit have four passages 12, yet related network connector 2 and network chip 3 be configured to prior art, and should consist of non-this case creation main points in the part, hereby repeat no more.
Above-mentioned network signal coupling circuit of the present utility model has following advantage when reality is used, as:
(1) this signal coupling circuit 1 is provided with two of tool two circuit respectively or two with upper channel 12, and one of them or one are to be provided with coupling module 14 between upper channel 12 2 ends, 14 two circuit with each passage of its coupling module are connected respectively and are provided with the first electric capacity 141 and the second electric capacity 142, and the first electric capacity 141 and the second electric capacity 142 contiguous the second link 11 1 sides respectively parallel connection are provided with the first equivalent resistance 143 and the second equivalent resistance 144, and each first electric capacity 141 and the second electric capacity 142 contiguous filtration module 13 1 sides respectively parallel connection are provided with C grade effect resistance 145 and fourth class effect resistance 146, and between each first equivalent resistance 143 and the second equivalent resistance 144 signal equivalence ground connection, the equivalent ground connection of signal then between each C grade effect resistance 145 and the fourth class effect resistance 146, utilize the electric capacity characteristic that its signal coupling intensity also can increase thereupon under the higher state of frequency, when making network higher, the network signal coupling effect of electric capacity also improves thereupon.
(2) because coupling module 14 is the equivalent resistance formation π shape loops with electric capacity and two end parallel connections thereof, general electric capacity and passive device have only been used, because must manually not wind the line, but directly be welded on the circuit board, so can do automated production, and electric capacity and passive device quality on producing can remain in the non-defective unit scope again.
So; the utility model is mainly for the network signal coupling circuit; be provided with two of tool two circuit respectively or two with upper channel 12 in signal coupling circuit 1; one of them or one are with upper channel two ends the first link 10; be provided with coupling module 14 between the second link 11; 14 two circuit with each passage of coupling module are in series with respectively the first electric capacity 141 and the second electric capacity 142; and each first electric capacity 141 and the second electric capacity 142 contiguous the second link 11 1 sides respectively parallel connection are provided with the first equivalent resistance 143 and the second equivalent resistance 144; and each first electric capacity 141 and the second electric capacity 142 contiguous filtration module 13 1 sides respectively parallel connection are provided with C grade effect resistance 145 and fourth class effect resistance 146; and between each first equivalent resistance 143 and the second equivalent resistance 144 signal equivalence ground connection; and signal equivalence ground connection between each C grade effect resistance 145 and the fourth class effect resistance 146; when utilizing electric capacity and equivalent resistance formation π shape loop to make network higher; its capacitance characteristic increases allows the network signal coupling effect also improve thereupon, promotes the signal coupling effect as main key protection point to reach.
More than explanation is just illustrative for the utility model; and it is nonrestrictive; those of ordinary skills understand; in the situation that does not break away from the spirit and scope that following claims limit; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.
Claims (8)
1. a network signal coupling circuit is to be arranged on the circuit board of tool network chip, and circuit board again device connected to the network be electrically connected signal coupling circuit so that signal is coupled, it is characterized in that:
Described signal coupling circuit is provided with two of tool two circuit respectively or two with upper channel, two or two the first links that have respectively the interconnection network connector with upper channel two ends, the second link of interconnection network chip, one of them or more than one passage are provided with respectively coupling module, coupling module is connected respectively with two circuit of passage and is provided with the first electric capacity and the second electric capacity, and contiguous the second link one side of the first electric capacity and the second electric capacity respectively parallel connection is provided with the first equivalent resistance and the second equivalent resistance, and contiguous the first link one side of each first electric capacity and the second electric capacity respectively parallel connection is provided with C grade effect resistance and fourth class effect resistance, and being connected in simultaneously signal equivalence earth terminal in each first equivalent resistance and the second equivalent resistance another end, each C grade effect resistance then is connected in the equivalent earth terminal of another signal simultaneously with fourth class effect resistance another end.
2. network signal coupling circuit according to claim 1, it is characterized in that, two of connecting of described the first link or two are provided with respectively filtration module with upper channel and coupling module is connected to the second link, and filtration module is in series with respectively the first coil and the second coil with two circuit of each passage.
3. network signal coupling circuit according to claim 1, it is characterized in that, described two or two form π shape loop with the electric capacity of upper channel institute each circuit of tool and the equivalent resistance of two end parallel connections thereof, and the π shape loop of two circuit is for being symmetrical shape, the equivalent resistance of the electric capacity two end parallel connections of two circuit, wherein the signal equivalence earth terminal that connects simultaneously of two of the adjacent network chip equivalent resistance another ends is earth terminal, and the signal equivalence earth terminal that two equivalent resistance another ends of adjacent network connector connect simultaneously is supply power voltage.
4. network signal coupling circuit according to claim 1, it is characterized in that, described electric capacity and two end equivalent resistances mate, electric capacity after the coupling is 0.1 μ farad, the equivalent resistance of electric capacity adjacent network chip one side is 49.9 ohm, and the in addition side equivalent resistance of adjacent network connector is 75 ohm.
5. a network signal coupling circuit is to be arranged on the network connector internal circuit board, and network connector is electrically connected signal coupling circuit so that signal is coupled with network chip again, it is characterized in that:
Described signal coupling circuit is provided with two of tool two circuit respectively or two with upper channel, two or two the first links that have respectively the interconnection network connector with upper channel two ends, the second link of interconnection network chip, one or more passage is provided with respectively coupling module, coupling module is connected respectively with two circuit of passage and is provided with the first electric capacity and the second electric capacity, and contiguous the second link one side of the first electric capacity and the second electric capacity respectively parallel connection is provided with the first equivalent resistance and the second equivalent resistance, and contiguous the first link one side of each first electric capacity and the second electric capacity respectively parallel connection is provided with C grade effect resistance and fourth class effect resistance, and being connected in simultaneously signal equivalence earth terminal in each first equivalent resistance and the second equivalent resistance another end, each C grade effect resistance then is connected in the equivalent earth terminal of another signal simultaneously with fourth class effect resistance another end.
6. network signal coupling circuit according to claim 5, it is characterized in that, two of connecting of described the first link or two are provided with respectively filtration module with upper channel and coupling module is connected to the second link, and filtration module is in series with respectively the first coil and the second coil with two circuit of each passage.
7. network signal coupling circuit according to claim 5, it is characterized in that, described two or two form π shape loop with the electric capacity of upper channel institute each circuit of tool and the equivalent resistance of two end parallel connections thereof, and the π shape loop of two circuit is for being symmetrical shape, the equivalent resistance of the electric capacity two end parallel connections of two circuit, wherein the signal equivalence earth terminal that connects simultaneously of two of the adjacent network chip equivalent resistance another ends is earth terminal, and the signal equivalence earth terminal that two equivalent resistance another ends of adjacent network connector connect simultaneously is supply power voltage.
8. network signal coupling circuit according to claim 5, it is characterized in that, described electric capacity and two end equivalent resistances are for mating, electric capacity after the coupling is 0.1 μ farad, the equivalent resistance of electric capacity adjacent network chip one side is 49.9 ohm, and the in addition side equivalent resistance of adjacent network connector is 75 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204033 CN202652178U (en) | 2012-05-08 | 2012-05-08 | Network signal coupling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204033 CN202652178U (en) | 2012-05-08 | 2012-05-08 | Network signal coupling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202652178U true CN202652178U (en) | 2013-01-02 |
Family
ID=47421206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220204033 Expired - Lifetime CN202652178U (en) | 2012-05-08 | 2012-05-08 | Network signal coupling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202652178U (en) |
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2012
- 2012-05-08 CN CN 201220204033 patent/CN202652178U/en not_active Expired - Lifetime
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20130102 |