CN102223162B - Combiner/divider, and method and system for covering mobile signals of elevator - Google Patents
Combiner/divider, and method and system for covering mobile signals of elevator Download PDFInfo
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Abstract
The invention provides a combiner/divider, and a method and a system for covering mobile signals of an elevator. The combiner/divider comprises an impedance matching module and a signal coupling module, wherein the impedance matching module is used for carrying out impedance conversion on ascending and descending mobile communication signals; the signal coupling module is used for separating the ascending and descending mobile communication signals which are coupled into corresponding video coaxial cables or corresponding wire telephone twisted-pair cables and used for coupling the ascending and descending mobile communication signals into the corresponding video coaxial cables or the corresponding wire telephone twisted-pair cables. By adoption of the combiner/divider, the mobile communication signals can be coupled into the original video coaxial cables or the original wire telephone twisted-pair cables in the elevator, so special wire-arranging construction is not required during the covering of signals of an elevator cage, and construction difficulty is reduced. Moreover, the arrangement of cables for specially transmitting wireless communication signals in an elevator well is not required, so investment cost is reduced.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to method and the system thereof of a kind of combiner-divider, the covering of elevator movable signal.
Background technology
Along with the fast development of urban construction, rise residential and work in high level building are more and more.In China's Code for design of dwelling houses, stipulate: the height on seven layers and above house or resident family's outdoor design of entrance floor identity distance ground surpasses the above house of 16m elevator must be set.Elevator is as a special environment for use, its elevator hoistways body of wall is thicker, and lift car mostly is metal cabinet, and the mobile communication signal decay is serious, the mobile communication signal rapid fading phenomenon of turnover elevator is serious, so the interior general mobile phone signal of elevator is fainter, there is no signal even fully.
Faint or even there is no the problem of signal in order to improve mobile phone signal in elevator, at present, those skilled in the art mainly adopts following several mode:
1) be illustrated in figure 1 the structural representation that hoistway trunk feeder top covers, at main feeder 2 of the interior introducing of elevator hoistways 1, wherein, main feeder 2 general employings 7/8 inch or 1/2 inch mobile communication dedicated coaxial cable, this main feeder 2 is fixed on elevator hoistways 1 inwall, and every 4～6 layer heights, on this main feeder 2, connecting the signal that a coupler 3 separates certain power, coupler 3 is connected to carry out the signal radiation with directional antenna 4 (for example Yagi antenna), make wireless communication signals be full of whole elevator hoistways 1, and then be penetrated into by elevator hoistways 1 that lift car 5 is interior realizes that signal covers.Be illustrated in figure 2 the structural representation that hoistway trunk feeder bottom covers, it is identical with Fig. 1 on principle, repeat no more here.Aforesaid way has the following disadvantages: (1) signal coverage goal is not direct, and a large amount of signal powers are wasted in hoistway, therefore causes the investment waste; (2) engineering construction difficulty, introduce main feeder and when butt coupling device and directional antenna 4 (for example Yagi antenna), need to interrupt the elevator operation on main feeder in elevator hoistways, by the workman, entered in elevator hoistways and carried out work high above the ground; (3) there is certain potential safety hazard, in case the coupler or the directional antenna that in elevator hoistways, arrange come off, by the operation of severe jamming elevator, cause serious accident;
2) as shown in Figure 3, adopt the mode of elevator hall, namely, at the ceiling mounted antennas 6 on 7 doorways, every layer of elevator hall, with 6 pairs of lift cars of this antenna 5, carry out the signal covering.The deficiency of this mode has: (1) elevator hall cabling difficulty, and difficulty of construction is large; (2) the closed twinkling signal of lift car decreases notably, and easily causes call drop; (3), because the antenna cover radius is limited, be not suitable for a fairly large number of occasion of elevator.
3) as shown in Figure 4, adopt the mode of leaky cable, along hoistway, lay a vertical leakage cable 8 each elevator hoistways 1 is interior, in the upper end of revealing cable or lower end directional antenna 4 (for example Yagi antenna) is installed.Also can be as shown in Figure 5, in upper end or the lower end installation power load 9 of revealing cable.Can also as shown in Figure 6, in conjunction with trunk, use.Adopt to reveal the mode of cable, although can well carry out the signal covering to lift car 5,, it exists, and to reveal cable expensive, cause investing high, and in elevator hoistways the large problem of difficulty of construction.
4) as shown in Figure 7, adopt the mode of retinue direct amplification machine, namely at the top of each elevator hoistways 1, a secondary directional antenna 4 (for example Yagi antenna) is installed, by this directional antenna 4 (for example Yagi antenna) to the interior radiation signal of elevator hoistways 1, the one secondary directional antenna 12 (for example Yagi antenna) that receives is installed simultaneously on the lift car 5 of correspondence, receive the signal in elevator hoistways 1, and the signal that will receive is after a direct amplification machine 10 amplifies, then carries out the signal covering by the 11 pairs of lift cars of retransmitting antenna 5 in lift car 5.Certainly, also can be as shown in Figure 8, a direct amplification machine 13 that is connected with directional antenna 4 (for example Yagi antenna) is set at the top of elevator hoistways 1, between lift car side direct amplification machine and elevator hoistways top direct amplification machine, by frequency-shift signaling, transmits like this, avoid self-excitation to disturb.This kind mode has following deficiency: (1) requires the higher power of elevator hoistways top directional antenna output; (2) retinue direct amplification machine service behaviour is had relatively high expectations, at signal controlling easy interference base station at that time not; (3) this kind signal soverlay technique is still immature at present.
5) as shown in Figure 9, adopt the mode of retinue cable, i.e. the special retinue cable 15 that is used for transmitting mobile communication signal that moves with lift car, i.e. cable, optical cable or the category-5 cable of arranging in hoistway.For this kind mode, have the following disadvantages: during (1) cable wiring manufacture, need to close down for a long time elevator; (2) these special cables that transmit mobile communication signal that are used for that arrange bend with the up-downgoing of elevator, are prone in the course of time hydraulic performance decline (as the increase of cable standing wave, the increase of optical cable light decay etc.), the problem that core fractures even occurs.In addition, for the mode of optical cable and category-5 cable, two ends all need to be provided with source device, cause the problem that cost is higher, and particularly for the mode of category-5 cable, its two ends also need to add Up/Down Conversion and digital processing device, and its equipment manufacturing cost can be higher.
Summary of the invention
The invention provides method and system thereof that a kind of combiner-divider, elevator movable signal cover, the engineering construction difficulty that exists in prior art is large, cost of investment is high to solve, to elevator safety operation, have hidden danger and can produce the problem of disturbing to base station.
The invention provides a kind of method that elevator movable signal covers, comprising:
The first impedance matching module is carried out impedance transformation to descending mobile communication signal;
The second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance transformation through described the first impedance module;
Described the second impedance matching module is also carried out impedance transformation to up mobile communication signal;
Described the first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance transformation through described the second impedance;
The first signal coupling module will be through described the first impedance matching module, the described descending mobile communication signal that carries out after impedance transformation is coupled into video coaxial cable or the telephone twisted-pair feeder in elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfers to described the first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfer to described the second impedance matching module, also will be through described the second impedance matching module, the described up mobile communication signal that carries out after impedance transformation is coupled into described video coaxial cable or described telephone twisted-pair feeder.
The present invention also provides a kind of combiner-divider, comprising:
Impedance matching module, for carrying out impedance transformation to the uplink and downlink mobile communication signal;
The signal coupling module, separate for the uplink and downlink mobile communication signal that will be coupled in video coaxial cable or telephone twisted-pair feeder; Also for the uplink and downlink mobile communication signal being coupled into to described video coaxial cable or described telephone twisted-pair feeder.
The present invention also provides a kind of elevator movable signal covering system, comprise two above-mentioned combiner-dividers, two one of described combiner-dividers are the far-end combiner-divider, another is the near-end combiner-divider, described near-end combiner-divider is arranged at outside elevator hoistways, described far-end combiner-divider is arranged on lift car, and described far-end combiner-divider and described near-end combiner-divider are connected with corresponding video coaxial cable or the telephone twisted-pair feeder of elevator.
The method that elevator movable signal provided by the invention covers, that mobile communication signal is coupled in elevator in original video coaxial cable or telephone twisted-pair feeder, adopt this kind method can carry out again special cable wiring manufacture, therefore reduced difficulty of construction, caused a hidden trouble also can for simultaneously the safe operation of elevator.And, owing to need in elevator hoistways, not laying the cable of special transmit wireless communication signal, therefore reduced input cost.Also have, wireless communication signals along cable transmission, has been avoided occurring existing the problem of disturbing to occur to base station in elevator hoistways.
The accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms the part of specification, be used to explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that hoistway trunk feeder top covers;
Fig. 2 is the structural representation that hoistway trunk feeder bottom covers;
Fig. 3 is the structural representation of the mode of employing elevator hall;
Fig. 4 is for installing the leaky cable mode structural representation of directional antenna;
Fig. 5 is the leaky cable mode structural representation of installation power load;
Fig. 6 is the leaky cable mode structural representation that uses in conjunction with trunk;
Fig. 7 is for adopting the structural representation of direct amplification machine mode;
Fig. 8 is the structural representation that the elevator hoistways top arranges direct amplification machine;
Fig. 9 is for adopting the structural representation of retinue cable mode;
Figure 10 is the structural representation of combiner device embodiment of the present invention;
Figure 11 is the structural representation of elevator movable signal covering system embodiment 1 of the present invention;
Figure 12 is near, far-end combiner-divider operation principle schematic diagram;
Figure 13 is that signal source is the structural representation of wireless direct amplification machine;
Figure 14 is the structural representation of elevator movable signal covering system embodiment 2 of the present invention;
Figure 15 is the theory diagram of signal-conversion equipment and signal inverse transformation device.
Reference numeral:
The 1-elevator hoistways; The 2-main feeder; The 3-coupler;
The 4-directional antenna; The 5-lift car; 6,23-antenna;
The 7-elevator hall; 8-reveals cable; The 9-power termination;
10,13-direct amplification machine; The 11-retransmitting antenna; 12-receives directional antenna;
The 14-impedance matching module; The 15-cable of accompanying; 16-signal coupling module;
17-near-end combiner device; 18-distal portion mixer; The 19-elevator(lift) machine room;
The 20-antenna; The 21-signal source; The 22-signal-conversion equipment;
The inverse transformation of 24-signal is established
Standby.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
The embodiment of the method that elevator movable signal of the present invention covers comprises:
The first impedance matching module is carried out impedance transformation to descending mobile communication signal;
The second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance transformation through described the first impedance module;
Described the second impedance matching module is also carried out impedance transformation to up mobile communication signal;
Described the first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance transformation through described the second impedance;
The first signal coupling module will be through described the first impedance matching module, the described descending mobile communication signal that carries out after impedance transformation is coupled into video coaxial cable or the telephone twisted-pair feeder in elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfers to described the first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfer to described the second impedance matching module, also will be through described the second impedance matching module, the described up mobile communication signal that carries out after impedance transformation is coupled into described video coaxial cable or described telephone twisted-pair feeder.
Adopt said method, that mobile communication signal is coupled in elevator in original video coaxial cable or telephone twisted-pair feeder, adopt this kind method can carry out again special cable wiring manufacture, therefore reduced difficulty of construction, cause a hidden trouble also can for simultaneously the safe operation of elevator.And, owing to need in elevator hoistways, not laying separately the cable of special transmit wireless communication signal, therefore reduced input cost.Also have, wireless communication signals along cable transmission, has been avoided occurring existing the problem of disturbing to occur to base station in elevator hoistways.
At present, the general coaxial cable that adopts 75 Ω-3D or 75 Ω-5D of video monitoring base band signal transmission, owing in the middle of such cable, adopting copper core and tyre gauze screen, therefore its signal attenuation is little, antijamming capability is strong, transmission range in 200 meters (approximately 70 floors) video signal quality without obvious decline.Twisted-pair feeder is the balance transmission mode of 100 Ω, utilizes two opposite characteristics of cable signal equal direction to suppress external disturbance, and transmission range is at 0-1500 rice.These two kinds of cables all have outfit in existing elevator trailing cable.The transmission of adopting above-mentioned two kinds of cables to carry out mobile communication signal is little to the change of existing elevator, and the engineering construction amount is little, is easy to realize.But, because mobile communication radio frequency signal requires characteristic impedance, be the radio-frequency transmission line of 50 ohm, and above-mentioned video monitoring cable be characteristic impedance is the coaxial cable of 75 ohm, and twisted-pair feeder is the balance transmission of 100 ohm.Therefore, need to be by the impedance transformation of radio frequency or intermediate frequency mobile communication signal work 50 Ω-75 Ω or 50 Ω-100 Ω, the impedance that makes to transmit the mobile communication signal in video coaxial cable, telephone twisted-pair feeder is converted to 75 Ω, 100 Ω accordingly, to meet the requirement of signal transmission.
When movable signal was coupled into video coaxial cable or telephone twisted-pair feeder, because the video monitoring signal bandwidth is 0～6MHz, the speech signal bandwidth that telephone transmits was below 200KHz, and it all belongs to the category of baseband signal.And mobile communication 2G signal mainly concentrates between 800～960MHz, and signal bandwidth is at 1710～1850MHz for another frequency range of 2G (being the DCS system), and the 3G signal is near 1810～2170MHz.At present, part mobile communication equipment (as digital optical fiber repeater) is down-converted to the radiofrequency signal of mobile communication in intermediate frequency 70～140MHz scope and processes on certain frequency.Therefore; quite long protection bandwidth is all arranged between above-mentioned base band, intermediate frequency, radiofrequency signal; therefore in same transmission cable when transmission of video pilot signal, telephone signal and wireless communication signals; between them, can, to forming and disturb each other, not guarantee the quality of each signal transmission.
Also have, before described descending mobile communication signal carries out impedance transformation, described descending mobile communication signal is carried out to analog-to-digital conversion, after described up mobile communication signal carries out the impedance inverse transformation, described up mobile communication signal is carried out to the digital-to-analogue conversion; After described descending mobile communication signal carries out the impedance inverse transformation, described descending mobile communication signal is carried out to the digital-to-analogue conversion, before described up mobile communication signal carries out impedance transformation, described up mobile communication signal is carried out to analog-to-digital conversion.Here said impedance transformation refers to, according to the difference of using cable, characteristic impedance is transformed to 75 Ωs corresponding with the cable characteristic impedance or 100 ohm by 50 Ω, and the impedance inverse transformation refers to the inverse process of above-mentioned impedance transformation, is about to 75 Ωs corresponding with the cable characteristic impedance or 100 ohm and is converted to 50 Ω.
After above-mentioned uplink and downlink mobile communication signal is carried out to the D/A conversion, the uplink and downlink mobile communication signal that transmits on video coaxial cable is digital signal, adopt digital signal to transmit all lossy little, antijamming capability is strong, relatively is suitable for using high rise elevator higher at floor, that the retinue cable is long, the speed of service is fast.
It is to be noted in addition, restriction due to video coaxial cable and telephone twisted-pair feeder own characteristic, the uplink and downlink mobile communication signal is before carrying out the D/A conversion, while being analog signal, can only carry out with video coaxial cable the coupled transfer of signal, and after carrying out the digitlization conversion, it both can carry out with video coaxial cable the coupled transfer of signal, can carry out with the telephone twisted-pair feeder coupled transfer of signal again.
As shown in figure 10, the structural representation of combiner-divider embodiment of the present invention, comprise impedance matching module 14 and signal coupling module 16.
As shown in figure 11, the structural representation of elevator movable signal covering system embodiment 1 of the present invention, comprise two combiner-dividers, and a combiner-divider is arranged in elevator(lift) machine room 19, and another combiner-divider is arranged on lift car.Two combiner-dividers all are connected with the video coaxial cable in elevator.The combiner-divider that is positioned at elevator(lift) machine room is near-end combiner-divider 17, and the combiner-divider that is positioned on lift car is far-end combiner-divider 18.Near-end combiner device 17 is coupled into video coaxial cable for the mobile communication signal by signal source 21 (being descending mobile communication signal), also for up mobile communication signal is separated in video coaxial cable.Far-end combiner-divider 18 is separated from video coaxial cable for the descending mobile communication signal that will be coupled in video coaxial cable, and the antenna in being arranged on lift car 5 20 carries out the signal covering to lift car 5, also for the mobile phone signal that antenna 20 is received, be coupled into video coaxial cable, form up mobile communication signal.For the quantity that reduces equipment in elevator and improve the beautifying property in lift car, antenna 20 and the monitoring camera in elevator can be integral.
As a special case, as shown in figure 13, above-mentioned signal source 21 can be wireless direct amplification machine, by the antenna 23 that is erected at the elevator(lift) machine room outside, obtain the mobile communication signal that send base station, and the mobile communication signal that it obtains is transferred to wireless direct amplification machine, wireless direct amplification machine carries out power amplification to above-mentioned mobile communication signal, and then is coupled into video coaxial cable through the near-end combiner-divider.
As shown in figure 12, the operation principle schematic diagram of near, far-end combiner- divider 17,18, this part is to utilize the video coaxial cable to transmit mobile communication signal as example.Descending mobile communication signal, i.e. mobile communication signal from base-station transmission to near-end combiner-divider 17, at first through the impedance matching module of near-end combiner-divider 17, carry out the conversion of impedance, the impedance transition that makes its radiofrequency signal is 75 Ω, afterwards, the signal coupling module of near-end combiner-divider 17 is coupled to above-mentioned descending mobile communication signal in video coaxial cable, and transmits to the far-end combiner-divider.For same signal stream, distal portion mixer 18 is opposite with the course of work of near-end combiner device 17, the signal coupling module that is distal portion mixer 18 is separated above-mentioned descending mobile communication signal in video coaxial cable, and make its impedance be converted to again 50 Ω, namely carry out the impedance inverse transformation.
For up mobile communication signal, namely far-end combiner-divider 18 is coupled to video coaxial cable by mobile phone signal (being up mobile communication signal) and vision signal input, and then by near-end combiner-divider 17, mobile phone signal and vision signal output is separated.This process is identical with the operation principle of said process, repeats no more here.
As shown in figure 14, the structural representation of elevator movable signal covering system embodiment 2 of the present invention, on the basis of above-described embodiment, be provided with signal-conversion equipment 22 between near-end combiner-divider and signal source; Between far-end combiner-divider and antenna, be provided with signal inverse transformation device 24.
Wherein, the theory diagram of signal-conversion equipment 22 and signal inverse transformation device 24 as shown in figure 15.For signal-conversion equipment 22, it comprises duplexer, and duplexer separates the uplink and downlink mobile communication signal, guarantees that the uplink and downlink mobile communication signal can work simultaneously.In signal-conversion equipment 22, descending mobile communication signal carries out down-converted through down conversion module DCM, make analog radio-frequency signal be downconverted to intermediate frequency, then by analog-to-digital conversion module ADC, change above-mentioned intermediate-freuqncy signal into digital signal, and carry out the filtering processing by descending digital filtering module DDC, with the signal by filtering, again through group/decoding and after the signal condition module processes accordingly, transfer to the near-end combiner-divider and be coupled into video coaxial cable.For the up mobile communication signal of separating through near-end combiner device, it is at first through group/decoding and after the signal condition module processes accordingly, again after upstream digital filtration module DUC carries out filtering, DAC is converted into analog if signal by the digital-to-analogue conversion module, by up-converter module UCM, this analog if signal is upconverted to radiofrequency signal more subsequently, and finally through duplexer, send.
For signal inverse transformation device 24, its principle and signal-conversion equipment 22 are basic identical.Its difference only is, between up-converter module and duplexer, is provided with amplifier PA the descending mobile communication signal after up-conversion is carried out to power amplification; Between down conversion module and duplexer, be provided with low noise amplifier LNA up mobile communication signal is carried out to the small-signal amplification.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, or part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. the method that the elevator movable signal covers, is characterized in that, comprising:
The first impedance matching module is carried out impedance transformation to descending mobile communication signal;
The second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance transformation through described the first impedance module;
Described the second impedance matching module is also carried out impedance transformation to up mobile communication signal;
Described the first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance transformation through described the second impedance;
The first signal coupling module will be through described the first impedance matching module, the described descending mobile communication signal that carries out after impedance transformation is coupled into video coaxial cable or the telephone twisted-pair feeder in elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfers to described the first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or described telephone twisted-pair feeder is separated, and transfer to described the second impedance matching module, also will be through described the second impedance matching module, the described up mobile communication signal that carries out after impedance transformation is coupled into described video coaxial cable or described telephone twisted-pair feeder;
After described descending mobile communication signal carries out impedance transformation, described descending mobile communication signal is carried out to down-converted, and the descending mobile communication signal that carries out after down-converted is carried out to analog-to-digital conversion, before described up mobile communication signal carries out impedance transformation, described up mobile communication signal is carried out to the digital-to-analogue conversion, and the up mobile communication signal after the logarithmic mode conversion carries out upconversion process;
Before described descending mobile communication signal carries out the impedance inverse transformation, described descending mobile communication signal is carried out to the digital-to-analogue conversion, and the descending mobile communication signal after the logarithmic mode conversion carries out upconversion process, after described up mobile communication signal carries out the impedance inverse transformation, described up mobile communication signal is carried out to down-converted, and the up mobile communication signal after down-converted is carried out to analog-to-digital conversion.
2. elevator movable signal covering system, it is characterized in that, comprise two combiner-dividers, two one of described combiner-dividers are the far-end combiner-divider, another is the near-end combiner-divider, described near-end combiner-divider is arranged at outside elevator hoistways, described far-end combiner-divider is arranged on lift car, and described far-end combiner-divider and described near-end combiner-divider are connected with corresponding video coaxial cable or the telephone twisted-pair feeder of elevator;
Chromacoder, with the near-end combiner-divider, be connected, for descending mobile communication signal is carried out to down-converted, and the descending mobile communication signal that carries out after down-converted is carried out to analog-to-digital conversion, and for up mobile communication signal is carried out to digital-to-analogue conversion, and the up mobile communication signal after the logarithmic mode conversion carries out upconversion process;
The signal inverter, with the far-end combiner-divider, be connected, for described descending mobile communication signal is carried out to the digital-to-analogue conversion, and the descending mobile communication signal after the logarithmic mode conversion carries out upconversion process, and carry out down-converted for described up mobile communication signal, and the up mobile communication signal after down-conversion is carried out to analog-to-digital conversion;
Wherein, described combiner-divider comprises:
Impedance matching module, for carrying out impedance transformation to the uplink and downlink mobile communication signal;
The signal coupling module, separate for the uplink and downlink mobile communication signal that will be coupled in corresponding video coaxial cable or telephone twisted-pair feeder; Also for the uplink and downlink mobile communication signal being coupled into to corresponding described video coaxial cable or described telephone twisted-pair feeder.
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| CN105401669B (en) * | 2015-11-04 | 2018-12-14 | 苏州大学 | Based on impedance matching to the unobstructed device of wireless signal |
| CN107579330A (en) * | 2017-08-31 | 2018-01-12 | 华桂星 | A kind of antenna assembly and its apply the signal coverage method in elevator hoistways |
| CN114142198B (en) * | 2021-12-16 | 2022-09-06 | 西安梅隆控制工程有限责任公司 | Single leakage cable with multipath effect and construction method |
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