CN103532511B - A kind of combiner with splitter functionality - Google Patents
A kind of combiner with splitter functionality Download PDFInfo
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- CN103532511B CN103532511B CN201310463431.7A CN201310463431A CN103532511B CN 103532511 B CN103532511 B CN 103532511B CN 201310463431 A CN201310463431 A CN 201310463431A CN 103532511 B CN103532511 B CN 103532511B
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Abstract
The present invention relates to a kind of combiner with splitter functionality, including mobile communication signal port, broadcast television signal port, common signal port, micro-strip integrates high-pass filtering circuit and micro-strip integrates low-pass filter circuit；One end that described mobile communication signal port integrates high-pass filtering circuit with micro-strip is connected；One end that described broadcast television signal port integrates low-pass filter circuit with micro-strip is connected；The other end of the other end and micro-strip integration low-pass filter circuit that described micro-strip integrates high-pass filtering circuit is all connected with described common signal port；Present design is the combiner (shunt) of movable signal stretcher, signal bandwidth is from 0MHz mono-2.8GHz, meet the indoor distributed system of the integration of three networks needs to broadband combiner, use LC wave filter ultimate principle to combine lumped parameter and distributed constant principle design；This combiner has the advantages such as volume little, lightweight, simple in construction, low cost simultaneously.
Description
Technical field
The present invention relates to mobile communication radio frequency passive device, particularly relate to one and there is splitter functionality simultaneously
Combiner.
Background technology
At present, GSM mobile communication signal (885-960MHz) is by existing radio and television (CATV)
The scheme that cable completes in-door covering is more and more universal.Its cardinal principle is by gsm communication signal and broadcast
By in CATV splicing chamber after television signal combining, pass through separator after registering one's residence again by GSM signal
Separating with broadcast television signal, the preferably external connection antenna at separator makes GSM signal to launch
Go out to cover.Combiner is the core devices in this scheme.But the frequency that existing combiner is supported
Section is narrow, does not support the frequency range of 4G mobile communication system, and therefore, 4G signal cannot complete in-door covering.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, it is provided that one has simultaneously
The combiner of splitter functionality.
The technical scheme is that a kind of there is splitter functionality simultaneously
Combiner, it is applied to television network broadcast and the conjunction road of mobile communications network and branch, including mobile logical
Letter signal port, broadcast television signal port, common signal port, micro-strip integrate high-pass filtering circuit and
Micro-strip integrates low-pass filter circuit；
One end that described mobile communication signal port integrates high-pass filtering circuit with micro-strip is connected；Described broadcast
One end that TV signal port integrates low-pass filter circuit with micro-strip is connected；Described micro-strip integrates high-pass filtering
The other end of circuit and micro-strip integrate the other end of low-pass filter circuit all with described common signal port even
Connect.
The invention has the beneficial effects as follows: present design is the combiner (branch of movable signal stretcher
Device), broadband is closed by signal bandwidth from 0MHz mono-2.8GHz, the indoor distributed system meeting the integration of three networks
The needs of road device, it includes radio and television frequency range and CMMB, CDMA, GSM, Des, WCDMA, CDMA3G
Frequency range with mobile communication system such as 4G.The design uses low cost LC wave filter ultimate principle to combine collection
Total parameter and distributed constant principle, by broadcast television signal port (CATV port) 5～862MHz frequency
Signal syntheses one tunnel of section and mobile communication signal port (MS port) 889～2800MHz frequency range is from public affairs
Signal port (COM port) output altogether, when this device is used as shunt, mixed signal is from public letter
The input of number port, the broadcast television signal of separation exports from broadcast television signal port, and movable signal is from shifting
Dynamic communication signal ports output；This combiner has that volume is little, lightweight, simple in construction, cost simultaneously
The advantage such as low.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described micro-strip integration high-pass filtering circuit includes m+1 electric capacity and m LC Series Sheet
Unit, described m+1 capacitances in series connects, and connects a LC at the junction point of the most adjacent two series capacitances
One end of electric capacity in series unit, the other end ground connection of inductance in described LC series unit；Described every phase
It is also associated with one section of ost microstrip line at the junction point of adjacent two series capacitances.
Above-mentioned further scheme is used to provide the benefit that: frequency is at more than 500MHz circuit, in micro-strip
Pad and cabling there is Distribution Effect, a pad can be equivalent to a dielectric capacitance, for offsetting this
Plant Distribution Effect, at the junction point of the most adjacent two series capacitances, be also associated with one section of ost microstrip line,
When this microstrip line is effectively offset altofrequency, the Distribution Effect that circuit produces so that 4G signal is at height
Bandpass filter is transmitted.
Further, described micro-strip integration low-pass filter circuit includes n+1 electric capacity and n LC receipts or other documents in duplicate
Unit, described n+1 electric capacity is connected in parallel, and connects a LC respectively between the most adjacent described two shunt capacitances
Parallel units；One end ground connection of each electric capacity of described parallel connection, the other end connects one section of ost microstrip line；
The described LC parallel units being connected with common signal port is connected with common signal port by an inductance.
Above-mentioned further scheme is used to provide the benefit that: one end of each electric capacity of described parallel connection connects one
Section trl microstrip line, described microstrip line plays the effect of isolation, and it can effectively filter out and enter into low pass filtered
High-frequency components in ripple device, reaches high-isolation, it is achieved the good result of low pass filter.
Further, described LC series unit includes an inductance, an electric capacity and one section of trl microstrip line,
Described trl microstrip line is connected in the middle of inductance and electric capacity.
Use above-mentioned further scheme to provide the benefit that: described in be connected on the trl in the middle of inductance and electric capacity
Microstrip line plays the efficient coupling between each rank of high pass filter.
Further, described m is 4.
Above-mentioned further scheme is used to provide the benefit that: described high pass filter realizes 9 rank high passes.
Further, described n is 6.
Above-mentioned further scheme is used to provide the benefit that: described low pass filter realizes 13 rank low passes.
Further, described mobile communication signal port is 50 ohmage microstrip lines, described radio and television
Signal port is 75 ohmage microstrip lines, and described common signal port is 75 ohmage microstrip lines.
Further, described 50 ohmage microstrip lines are by 75 ohmage microstrip lines and 61.5 ohm of resistances
Anti-microstrip line transformation obtains, a length of 12mm of described 61.5 ohmage microstrip lines, and width is 1.3mm；
Described 75 ohmage micro belt line widths are 1mm.
Above-mentioned further scheme is used to provide the benefit that: described microstrip line is used for carrying out impedance transformation, real
The coupling that existing port is good, because the defeated people output when design of high pass ptototype filter is all with the end of 75 Ω
Mouth impedance design, it is simple to the coupling of public port, therefore common port requires it is 75 Ω impedances outputs, but
Micro-strip is integrated high-pass filtering circuit output port and is required to be 50 Ω, and a bit of coaxial line here is about
12mm, serves impedance transformation, by 75 Ω impedance transformations to 50 Ω impedances.
Further, it is 2800MHz that described micro-strip integrates high-pass filtering circuit cut-off frequency, and described micro-strip is whole
Closing low-pass filter circuit cut-off frequency is 862MHz.
Further, described mobile communication signal port uses N connector, described broadcast television signal port
Using F joint, described common signal forms its port of T-shaped connection and uses F joint.
Above-mentioned further scheme is used to provide the benefit that: to be easy to coupling and the connection of port.
Further, technique scheme also includes the micro-strip plate for welding circuit, the plate of described micro-strip plate
Material is F4B, and dielectric constant is 3.5, and sheet metal thickness is 1mm.
Above-mentioned further scheme is used to provide the benefit that: when considering circuit realiration, frequency is at 500MHz
Time above, pad, cabling on micro-strip plate have Distribution Effect, one piece of isolated pad, simultaneously equivalence
It is a dielectric capacitance, and the change that component parameters transmission is bigger can be made, above-mentioned micro-strip plate sheet material selection,
The selection of dielectric constant and sheet metal thickness can farthest reduce Distribution Effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of combiner with splitter functionality of the present invention；
Fig. 2 is the circuit diagram of a kind of combiner with splitter functionality of the present invention；
Fig. 3 is circuit diagram circuit diagram after parameter optimization in Fig. 2；
Fig. 4 is the partial enlarged drawing that micro-strip described in Fig. 3 integrates high-pass filtering circuit；
Fig. 5 is the partial enlarged drawing that micro-strip described in Fig. 3 integrates low-pass filter circuit.
In accompanying drawing, the list of parts representated by each label is as follows:
1, mobile communication signal port, 2, broadcast television signal port, 3, common signal port, 4,
Micro-strip integrate high-pass filtering circuit, 5, micro-strip integrate low-pass filter circuit.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with accompanying drawing, example is served only for explaining this
Invention, is not intended to limit the scope of the present invention.
As shown in Figure 1, 2, a kind of combiner with splitter functionality, it is applied to broadcast electricity
The conjunction road of view network and mobile communications network and branch, including mobile communication signal port 1, radio and television
Signal port 2, common signal port 3, micro-strip integrate high-pass filtering circuit 4 and micro-strip integrates low pass filtered
Wave circuit 5；
One end that described mobile communication signal port 1 integrates high-pass filtering circuit 4 with micro-strip is connected；Described
One end that broadcast television signal port 2 integrates low-pass filter circuit 5 with micro-strip is connected；Described micro-strip is integrated
The other end that the other end of high-pass filtering circuit 4 and micro-strip integrate low-pass filter circuit 5 is all public with described
Signal port 3 connects.
As shown in Figure 2,3, described micro-strip integration high-pass filtering circuit 4 includes that m+1 electric capacity and m are individual
LC series unit, described m+1 capacitances in series connects, at the junction point of the most adjacent two series capacitances even
Connect one end of electric capacity in a LC series unit, the other end ground connection of inductance in described LC series unit；
It is also associated with one section of ost microstrip line at the junction point of the most adjacent described two series capacitances.Described LC goes here and there
Receipts or other documents in duplicate unit includes an inductance, an electric capacity and one section of trl microstrip line, and described trl microstrip line is connected on
In the middle of inductance and electric capacity.
Described micro-strip is integrated low-pass filter circuit 5 and is included n+1 electric capacity and n LC parallel units, institute
State n+1 electric capacity to be connected in parallel, between the most adjacent described two shunt capacitances, connect a LC parallel connection respectively
Unit；One end ground connection of each electric capacity of described parallel connection, the other end connects one section of ost microstrip line；Described
The LC parallel units being connected with common signal port is connected with common signal port by an inductance.
Described mobile communication signal port is 50 ohmage microstrip lines, described broadcast television signal port
Being 75 ohmage microstrip lines, described common signal port is 75 ohmage microstrip lines.Described 50
Ohmage microstrip line is obtained by 75 ohmage microstrip lines and 61.5 ohmage microstrip line transformations, institute
Stating a length of 12mm of 61.5 ohmage microstrip lines, width is 1.3mm；Described 75 ohmages are micro-
Band line width is 1mm.Described microstrip line is used for carrying out impedance transformation, it is achieved the coupling that port is good, because of
It is all to design with the port Impedance of 75 Ω for the defeated people output when design of high pass ptototype filter, it is simple to public
The coupling of port altogether, therefore common port requires it is 75 Ω impedance outputs, but micro-strip integrates high-pass filtering circuit
It is 50 Ω that output port requires, a bit of coaxial line (high impedance microstrip line) here is about 12mm,
Serve impedance transformation, by 75 Ω impedance transformations to 50 Ω impedances.
It is 9 joints that described micro-strip integrates the joint number of high-pass filtering circuit, and cut-off frequency is 2800MHz；Described
It is 13 joints that micro-strip integrates the joint number of low-pass filter circuit, and cut-off frequency is 862MHz.
Described mobile communication signal port uses N connector, and described broadcast television signal port uses F to connect
Head, described common signal forms its port of T-shaped connection and uses F joint, it is simple to the coupling of port and
Connect.
Technique scheme also includes that the micro-strip plate for welding circuit, the sheet material of described micro-strip plate are F4B,
Dielectric constant is 3.5, and sheet metal thickness is 1mm.Consider circuit realiration time, frequency when more than 500MHz,
Pad, cabling on micro-strip plate have Distribution Effect, one piece of isolated pad, are equivalent to Jie simultaneously
Matter electric capacity, and component parameters can be made to send bigger change, above-mentioned micro-strip plate sheet material selection, dielectric constant
Selection with sheet metal thickness can farthest reduce Distribution Effect.
The combiner with splitter functionality of the present invention uses as combiner simultaneously time, by CATV
Signal and mobile base station signal syntheses one road signal, be then fed into the Coaxial Cables of CATV system.
It has two input ports be respectively broadcast television signal port (CATV mouth, impedance is 75 Ω) and move
Communication signal ports (MS mouth, impedance 50 Ω)；One delivery outlet be common signal port (com port,
Impedance 75 Ω).
The combiner with splitter functionality of the present invention uses as shunt simultaneously time, by CATV
In system coaxial cable, mixed signal separates.Mixed signal passes through common signal port (com port, impedance
75 Ω) enter shunt；After shunt, mobile communication signal passes through mobile communication signal port (MS
Mouthful, impedance 50 Ω) travel in the air, broadcast television signal broadcast television signal port (CATV mouth,
Impedance 75 Ω) export on Set Top Box.
The combiner with splitter functionality of the present invention meets CHINA RFTCOM Co Ltd and each standard mobile
The working frequency range requirement of communication network (2G, 3G, 4G, WLAN), signal bandwidth is from 0MHz mono-2.8GHz.
The described combiner with splitter functionality is passive device.
The combiner with splitter functionality of the present invention, when using as combiner, its technology
Index is as shown in table 1.
Table 1
The combiner with splitter functionality of the present invention uses as combiner simultaneously time, its technology refers to
Mark is as shown in table 2.
Table 2
In modern network synthetic method, lamped element lowpass prototype filter is the base of Design of microwave filters
Plinth, low pass, high pass, band be logical, band elimination filter, and transmission characteristic is mostly derived according to this prototype.
According to different approximating functions, different responses can be obtained, and the response of elliptic function is superior,
The passband of this function and stopband such as are all at the ripples, and steepness is big, selectivity good.This programme is designed as one
Road micro-strip integrates low-pass filter circuit and a road micro-strip is integrated high-pass filtering circuit and synthesized a road through common port,
Consider that the intermediate zone of two passages is less, higher isolation will be reached, so it is ellipse for selecting filter function
Circular function.First, selected lowpass prototype filter and high pass ptototype filter, this preferable lump is filtered
Ripple device prototype can be obtained by design software, and that select here is Serenade Design.Micro-strip is whole
The cut-off frequency closing low-pass filter circuit is 862MHz, 13 rank；Micro-strip integrates cutting of high-pass filtering circuit
Only frequency is 2800MHz, 9 rank.And wave filter two ends port Impedance is 75 Ω.
Height, micro-strip are integrated low-pass filter circuit cascade, and drawn public port at cascade, is i.e. formed
Combiner, notices that the impedance of common port is 75 Ω, and during actual application, combiner is not that two wave filter lead to
The simple cascade in road and the simple extraction of common port, be considered as the coupling of common port, and common port is formed here
One T junction.
Fig. 2, in 3, the capacitance size of described electric capacity C1-C18 is followed successively by: 2pF, 2pF, 2pF, 3
pF、2pF、2.4pF、1.5pF、7pF、1.5pF、2.4pF、1.8pF、1.5pF、1pF、
1.5pF、1.5pF、1.5pF、1pF、1.5pF。
The size of described inductance L1-L10 is followed successively by: 16.8nH, 10.7nH, 16.8nH, 9.3nH, 21.1nH,
10.7nH、16.8nH、10.7nH、16.8nH、11.6nH。
Fig. 3 is the circuit diagram obtained after software optimization prototype parameter, time actually used, Fig. 2 circuit
The capacitance of middle C10 ' and C11 ' tends to infinitely great, is equivalent to open circuit, therefore can remove the two at circuit
Electric capacity, and C19, C20 also can install in reality is debugged.
Frequency has Distribution Effect at more than 500MHz circuit, pad and cabling in micro-strip, one
Pad can be equivalent to a dielectric capacitance, can be equivalent to a bit of by the Distribution Effect of pad by emulation
Microstrip line such as Fig. 2 in from MS port to the main transmission line of VATV port on 9 ost microstrip lines,
The specification of described ost microstrip line be respectively as follows: 2.5 × 3mm, 2.5 × 3mm, 2.5 × 2mm, 2.5 × 2mm,
2.5×3mm、3×4.5mm、3×4.5mm、2.5×1.8mm、2.5×1.8mm；In Fig. 4 each
The specification of the trl microstrip line in LC series unit is 3 × 2mm, and its effect is impedance correction, because
After frequency height, the Distribution Effect of pad can produce, and therefore can cause the change of resistance value, so by micro-
Band wire is adapted to 75 ohm；And high pass filter output port requires to be 50 Ω, MS port
The a width of 1.3mm of a bit of microstrip line, is about 12mm, serves impedance transformation, is arrived by 75 Ω impedance transformations
50 Ω impedances, emulation should synchronize to carry out, by the actual size of pad on micro-strip plate in conjunction with micro-strip plate fabric swatch
Bring circuit theory diagrams into carry out calculating and optimization Simulation.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (10)
1. having a combiner for splitter functionality, it is applied to television network broadcast and movement simultaneously
The conjunction road of communication network and branch, it is characterised in that include that mobile communication signal port, radio and television are believed
Number port, common signal port, micro-strip integrate high-pass filtering circuit and micro-strip integrates low-pass filter circuit；
One end that described mobile communication signal port integrates high-pass filtering circuit with micro-strip is connected；Described broadcast
One end that TV signal port integrates low-pass filter circuit with micro-strip is connected；Described micro-strip integrates high-pass filtering
The other end of circuit and micro-strip integrate the other end of low-pass filter circuit all with described common signal port even
Connect；
Described micro-strip is integrated high-pass filtering circuit and is included m+1 electric capacity and m LC series unit, described
M+1 capacitances in series connects, and connects a LC series unit at the junction point of the most adjacent two series capacitances
One end of middle electric capacity, the other end ground connection of inductance in described LC series unit；The most adjacent described two strings
It is also associated with one section of ost microstrip line at the junction point of connection electric capacity.
A kind of combiner with splitter functionality, its feature exists
In, described micro-strip is integrated low-pass filter circuit and is included n+1 electric capacity and n LC parallel units, described
N+1 electric capacity is connected in parallel, and connects a LC receipts or other documents in duplicate respectively between the most adjacent described two shunt capacitances
Unit；One end ground connection of each electric capacity of described parallel connection, the other end connects one section of ost microstrip line；Described with
The LC parallel units that common signal port connects is connected with common signal port by an inductance.
A kind of combiner with splitter functionality, its feature exists
In, described LC series unit includes an inductance, an electric capacity and one section of trl microstrip line, described trl
Microstrip line is connected in the middle of inductance and electric capacity.
A kind of combiner with splitter functionality, its feature exists
In, described m is 4.
A kind of combiner with splitter functionality, its feature exists
In, described n is 6.
A kind of combiner with splitter functionality, its feature exists
In, described mobile communication signal port is 50 ohmage microstrip lines, described broadcast television signal port
Being 75 ohmage microstrip lines, described common signal port is 75 ohmage microstrip lines.
A kind of combiner with splitter functionality, its feature exists
In, described 50 ohmage microstrip lines are by 75 ohmage microstrip lines and 61.5 ohmage microstrip lines
Conversion obtains, a length of 12mm of described 61.5 ohmage microstrip lines, and width is 1.3mm；Described 75
Ohmage micro belt line width is 1mm.
A kind of combiner with splitter functionality, its feature exists
In, it is 2800MHz that described micro-strip integrates high-pass filtering circuit cut-off frequency, and described micro-strip integrates low pass filtered
Wave circuit cut-off frequency is 862MHz.
A kind of combiner with splitter functionality, its feature exists
In, described mobile communication signal port uses N connector, and described broadcast television signal port uses F to connect
Head, described common signal forms its port of T-shaped connection and uses F joint.
A kind of combiner with splitter functionality, its feature exists
In, also including that the micro-strip plate for welding circuit, the sheet material of described micro-strip plate are F4B, dielectric constant is
3.5, sheet metal thickness is 1mm.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109309855A (en) * | 2017-07-27 | 2019-02-05 | 国基电子（上海）有限公司 | Demultiplexer and front-end circuit |
| CN107302346B (en) * | 2017-08-22 | 2021-07-02 | 四川九州电子科技股份有限公司 | Circuit for solving interference of WiFi to CATV radio frequency circuit |
| CN110247670A (en) * | 2019-07-16 | 2019-09-17 | 南京创吉信息科技有限公司 | A kind of co-shunt circuit structure of receiver output port |
| CN110350869A (en) * | 2019-07-25 | 2019-10-18 | 合肥本源量子计算科技有限责任公司 | A kind of microwave signal splitter |
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