CN103607235A - Antenna feed system access device and antenna feed system - Google Patents
Antenna feed system access device and antenna feed system Download PDFInfo
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Abstract
The invention discloses an antenna feed system access device, comprising a first filtering device, a second filtering and an inverter bridge. The filtering device comprises a first emission filter, a second emission filter and a first receiving filter; the second filtering device comprises a third emission filter, a fourth emission filter and a second receiving filter; and the inverter bridge is connected to the first emission filter, the second emission filter, the third emission filter and the fourth emission filter respectively. The invention also discloses an antenna feed system, comprising an antenna, an antenna feed system access device and a base transceiver station. Through the abovementioned structure, an implementation scheme of the antenna system access device can be simplified, the size is reduced, at the same time, the degree of unbalance of amplitudes and phase positions of power dividing signals is lowered, and various other performance indexes are improved.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of antenna-feedback system access device and antenna-feedback system.
Background technology
In some application scenarios of ± 45 ° of cross polarization antenna-feedback systems, except needs guarantee diversity reception, also need to be superimposed as in space transmitting perpendicular polarization signal or horizontal polarization signal, realize the system applies block diagram of this function as shown in Figure 1, comprise: base transceiver station (Base Transceiver Station, BTS), antenna-feedback system access device, ± 45 ° of cross polarised antennas and cable.Wherein, antenna-feedback system access device comprises that antenna port ANT1, ANT2, transmitting 1/ receive 1 port (Transmit1/Receive1, TX1/RX1) and launch 2/ reception 2 port (Transmit2/Receive2, TX2/RX2) ports.Antenna port ANT1, ANT2 are for being connected with ± 45 ° of cross polarised antennas, and TX1/RX1 port is connected with BTS with TX2/RX2 port.
BTS has two transmiting signal sources (transmit 1 and transmit 2), first BTS by transmit 1 and transmit 2 respectively TX1/RX1 port and the TX2/RX2 port by antenna-feedback system access device be emitted to antenna-feedback system access device, this device 1 Merit Citation Class II that will transmit is divided into and transmits 11 and transmit 12, and will transmit 11 and the 12 access ± 45 ° cross polarised antenna that transmits, make it in space, be superimposed as perpendicular polarization signal.Simultaneously antenna-feedback system access device 2 Merit Citation Class II that will transmit are divided into and transmit 21 and transmit 22, and will transmit 21 and the 22 access ± 45 ° cross polarised antenna that transmits, and make it in space, be superimposed as horizontal polarization signal.Wherein, transmit 11 identical with phase place with 12 the amplitude of transmitting, 21, single spin-echos identical with 22 the amplitude of transmitting transmit.
Meanwhile, the reception signals 1 that antenna-feedback system access device also can receive ± 45 ° of cross polarised antennas by its antenna port ANT1 and ANT2 and 2 accesses of reception signal, and be transferred to BTS, the receive diversity of settling signal.
Wherein, antenna-feedback system access device is identical with two stube cable electrical length between ± 45 ° of cross polarised antennas.
The operation principle block diagram of prior art antenna-feedback system access device as shown in Figure 2, comprising: duplexer 1, duplexer 2, duplexer 3, duplexer 4, electric bridge, 90 ° of phase shifters, cable 1, cable 2, cable 3, cable 4, cable 5, cable 6, ANT1 port, ANT2 port, TX1/RX1 port and TX2/RX2 ports.Wherein, duplexer 1 comprises emission filter 1(TX1), receiving filter 1(RX1); Duplexer 2 comprises TX2 filter, RX2 filter; Duplexer 3 comprises TX3 filter, RX3 filter; Duplexer 4 comprises TX4 filter, RX4 filter.
Antenna-feedback system access device specific works principle is as follows:
From transmitting of BTS, 1 from TX1/RX1 port, enter, TX3 filter and cable 3 through duplexer 3 enter electric bridge, the 11 TX1 filters through cable 1 and duplexer 1 that transmit are along separate routes from the output of ANT1 port, and the 12 TX2 filters through 90 ° of phase shifters, cable 2 and duplexer 2 that transmit are exported from ANT2 port; In like manner, transmit and 2 from TX2/RX2 port, enter, TX4 filter and cable 4 through duplexer 4 enter electric bridge, the 21 TX1 filters through cable 1 and duplexer 1 that transmit are along separate routes from the output of ANT1 port, and the 22 TX2 filters through 90 ° of phase shifters, cable 2 and duplexer 2 that transmit are exported from ANT2 port.Through electric bridge and 90 ° of phase shifter effects to phase place jointly, transmit 1 at ANT1 port and ANT2 port, obtain transmit 11 identical with 12 the phase place of transmitting, transmit 2 at ANT1 port and ANT2 port, obtain transmit 21 with transmit 22 single spin-echo.Therefore, in the situation that guarantee respectively ± 45 ° of cross polarised antennas of access transmit 11 with transmit 12, transmit 21 identical with 22 the amplitude of transmitting, transmit 11 and transmit and 12 in space, be superimposed as perpendicular polarization signal, transmit 21 and transmit and 22 in space, be superimposed as horizontal polarization signal.
In addition, the reception signal 1 that antenna reception arrives can be through the RX3 filter of the RX1 of duplexer 1 filter, cable 5 and duplexer 3, receive signal 2 and can through the RX4 filter of the RX2 of duplexer 2 filter, cable 6 and duplexer 4, enter the corresponding receiver of BTS, reach the object of diversity reception.
But, the function of the access device of antenna-feedback system shown in Fig. 2 realizes needs 4 duplexers, 1 common electric bridge, 1 90 ° of phase shifter, 6 cables, connect complicated, debugging difficulty is large, phase place is difficult to (for example: in GSM900 frequency range, the length of cable 1 and cable 2 differs 0.9mm, and its phase difference just has 1 ° control, frequency is higher just higher to the poor requirement of two cable lengths), also have that insertion loss is large, passive intermodulation is poor, system standing-wave ratio is large, volume large, high in cost of production shortcoming simultaneously.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of antenna-feedback system access device and antenna-feedback system, can reduce the volume of antenna-feedback system access device, simplify the implementation of antenna-feedback system access device, reduce amplitude imbalance degree and the phase unbalance degree of merit sub-signal simultaneously, and improve all other performance index.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of antenna-feedback system access device is provided, comprises the first filter, the second filter and inverter bridge; Wherein, the first filter comprises the first emission filter, the second emission filter and the first receiving filter; The second filter comprises the 3rd emission filter, the 4th emission filter and the second receiving filter; Inverter bridge is connected to the first emission filter, the second emission filter, the 3rd emission filter and the 4th emission filter.
Wherein, antenna-feedback system access device also comprises: first day line cap, second day line cap, the first reception/emission port and the second reception/emission port; Wherein, first day line cap, the first reception/emission port are connected to the first filter; Second day line cap, the second reception/emission port are connected to the second filter.
Wherein, inverter bridge has the first port, the second port, the 3rd port and the 4th port, for exporting from the first port and the second port after dividing from the signal merit of the 3rd port, will be from the first port and the output of the second port after dividing from the signal merit of the 4th port.
Wherein, the first port of inverter bridge, the second port, the 3rd port and the 4th port are connected with the first emission filter, the 3rd emission filter, the second emission filter and the 4th emission filter respectively, wherein, signal through the second emission filter feed-in inverter bridge the 3rd port, being inverted electric bridge merit, to be divided into phase difference be respectively from the first port and the output of the second port of inverter bridge, then respectively via the first emission filter and the output of the 3rd emission filter after the two paths of signals of 0 °; Signal through the 4th emission filter feed-in inverter bridge the 4th port, being inverted electric bridge merit, to be divided into phase difference be respectively from the first port and the output of the second port of inverter bridge, then respectively via the first emission filter and the output of the 3rd emission filter after the two paths of signals of 180 °.
Wherein, between inverter bridge, the first emission filter and first day line cap, between the topological structure of signal transmission path and inverter bridge, the 3rd emission filter and second day line cap, the topological structure of signal transmission path is identical.
Wherein, the first emission filter is identical with the physical structure of the 3rd emission filter.
Wherein, the first emission filter, the second emission filter, the 3rd emission filter are identical with the 4th emission filter frequency range, are the transmit frequency band of the first filter and the second filter.
Wherein, the first receiving filter is identical with the frequency range of the second receiving filter, is the reception frequency range of the first filter and the second filter.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of antenna-feedback system is provided, comprises: antenna, antenna-feedback system access device and base transceiver station, and antenna-feedback system access device is connected to antenna and base transceiver station; Wherein, antenna-feedback system access device comprises the first filter, the second filter and inverter bridge; The first filter comprises the first emission filter, the second emission filter and the first receiving filter; The second filter comprises the 3rd emission filter, the 4th emission filter and the second receiving filter; Inverter bridge is connected to the first emission filter, the second emission filter, the 3rd emission filter and the 4th emission filter.
Wherein, signal process antenna-feedback system access device, the antenna of antenna-feedback system for base transceiver station is launched, making to transmit is superimposed as perpendicular polarization signal or horizontal polarization signal in space; Wherein, transmit as the signal of a plurality of signal source transmittings in base transceiver station.
Wherein, antenna-feedback system, for by signal process antenna-feedback system access device, the base transceiver station of antenna reception, makes to receive signal and realizes diversity reception; Wherein, receiving signal is multipath reception signal.
The invention has the beneficial effects as follows: the situation that is different from prior art, antenna-feedback system access device of the present invention utilizes inverter bridge to replace general electric bridge and 90 ° of phase shifters of prior art, access device only needs two receiving filters simultaneously, and in the connection procedure of each device, cancel the connected mode of cable.By said structure, the present invention can reduce the volume of antenna-feedback system access device, simplifies the implementation of antenna-feedback system access device, reduces amplitude imbalance degree and the phase unbalance degree of merit sub-signal simultaneously, and improves all other performance index.
Accompanying drawing explanation
Fig. 1 is prior art antenna-feedback system application block diagram;
Fig. 2 is prior art antenna-feedback system access device operation principle block diagram;
Fig. 3 is the structural representation of antenna-feedback system access device one embodiment of the present invention;
Fig. 4 is the structural representation of antenna-feedback system one embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Refer to Fig. 3, antenna-feedback system access device one embodiment of the present invention comprises: the first filter, the second filter and inverter bridge.
Wherein, the first filter comprises the first emission filter (Transmit, TX1), the second emission filter (Transmit, TX2) and the first receiving filter (Receive, RX1); The second filter comprises the 3rd emission filter (Transmit, TX3), the 4th emission filter (Transmit, TX4) and the second receiving filter (Receive, RX2); Inverter bridge is connected to the first emission filter, the second emission filter, the 3rd emission filter and the 4th emission filter.
In the present embodiment, antenna-feedback system access device also comprises: first day line cap (ANT1), second day line cap (ANT2), the first reception/emission port (TX1/RX1) and the second reception/emission port (TX2/RX2); Wherein, first day line cap, the first reception/emission port are connected to the first filter; Second day line cap, the second reception/emission port are connected to the second filter.
In the present embodiment, inverter bridge has the first port B1, the second port B2, the 3rd port B3 and the 4th port B4, for exporting from the first port B1 and the second port B2 after dividing from the signal merit of the 3rd port B3, will be from the first port B1 and the second port output B2 after dividing from the signal merit of the 4th port B4.
Further, the first port B1 of inverter bridge, the second port B2, the 3rd port B3 and the 4th port B4 are connected with the first emission filter, the 3rd emission filter, the second emission filter and the 4th emission filter respectively, wherein, signal through the second emission filter feed-in inverter bridge the 3rd port B3, being inverted electric bridge merit, to be divided into phase difference be respectively from the first port B1 and the second port B2 output of inverter bridge, then respectively via the first emission filter and the output of the 3rd emission filter after the two paths of signals of 0 °; Signal through the 4th emission filter feed-in inverter bridge the 4th port B4, being inverted electric bridge merit, to be divided into phase difference be respectively from the first port B1 and the second port B2 output of inverter bridge, then respectively via the first emission filter and the output of the 3rd emission filter after the two paths of signals of 180 °.
Wherein, the structure of inverter bridge is, inverter bridge comprise homophase power splitter and with the wideband balun of homophase power splitter common output mouth B1, B2.
Homophase power splitter comprises two wires, is respectively used to connect the 3rd port B3 and the first port B1, the second port B2.Homophase power splitter is exported from the first port B1, the second port B2 respectively after the signal merit of its 3rd port B3 feed-in is divided into the signal that two-way phase place is identical.
Wideband balun comprises three wires, wire 1 is connected in the 4th port B4 and open circuit port, wire 2,3 respectively with the first half of wire 1, latter half over against, to form respectively two sections of λ/4 coupling lines, its degree of coupling is 3dB, and wire 2 is connected in the first port B1 and grounding ports, wire 3 is connected in the second port B2 and grounding ports.Wideband balun will be exported respectively the signal of two-way single spin-echo from the signal of its 4th port B4 input is processed from the first port B1, the second port B2.
Homophase power splitter also comprises dielectric-slab and forms the cavity on ground.In homophase power splitter, wire, dielectric-slab and cavity form microstrip transmission line, and its characteristic impedance is 70.7 ohm.
Wideband balun also comprises two cavitys that form ground.In wideband balun, wire and cavity form parallel coupled line.
In the present embodiment, the first emission filter, the second emission filter, the 3rd emission filter are identical with the 4th emission filter frequency range, are the transmit frequency band of the first filter and the second filter.The first receiving filter is identical with the frequency range of the second receiving filter, is the reception frequency range of the first filter and the second filter.
In the present embodiment, inverter bridge is divided for input signal is wherein carried out to merit, can make merit divide the signal phase of rear output identical or contrary, the two paths of signals being specially in input inversion electric bridge is isolated completely, as shown in Figure 3, from the signal merit of inverter bridge lower left input is divided, phase place is identical, and phase difference is 0 °; Single spin-echo from the signal merit of inverter bridge lower right input is divided, phase difference is 180 °.
Elaborate the operation principle of the present embodiment antenna-feedback system access device below.
The antenna-feedback system access device of the present embodiment is applied to antenna-feedback system, what first TX1/RX1 port and TX2/RX2 port were inputted respectively BTS transmitting transmits 1 and transmit 2, the 1 process TX2 filter that transmits enters inverter bridge, and the 2 process TX4 filters that transmit enter inverter bridge.
Then, inverter bridge respectively by input transmit 1 and 2 Merit Citation Class II that transmit divide output, wherein, 1 merit that transmits is divided into and transmits 11 and transmit 12,2 merits that transmit are divided into and transmit 21 and transmit 22.The 11 process TX1 filters that transmit of inverter bridge output are from the output of ANT1 port, and the 12 process TX3 filters that transmit are exported from ANT2 port.In like manner, the 21 process TX1 filters that transmit of inverter bridge output are from the output of ANT1 port, and the 22 process TX3 filters that transmit are exported from ANT2 port.Utilize inverter bridge to make transmitting of output 11 identical with 12 phase places that transmit, transmit 21 with transmit 22 single spin-echos.
Therefore ANT1 port is connected with one of ± 45 ° of cross polarised antennas respectively with ANT2 port, and ± 45 ° of cross polarised antennas of access transmits 11 and transmit and 12 in space, be superimposed as perpendicular polarization signal.± 45 ° of cross polarised antennas of access transmit 21 and transmit and 22 in space, be superimposed as horizontal polarization signal.
The antenna-feedback system access device of the present embodiment has following features:
A. connect antenna identical with the electrical length of two cables of ANT1 port, ANT2 port;
B. transmit 11 identical with 12 topological structures through path that transmit, transmit 21 identical with 22 topological structures through path that transmit.The topological structure that is signal transmission path between topological structure and inverter bridge, the 3rd emission filter and the second day line cap of signal transmission path between inverter bridge, the first emission filter and first day line cap is identical.
The topological structure of C.TX1 filter and TX3 filter, and the structure connecting with inverter bridge is identical.More preferably, TX1 filter is identical with the physical structure of TX3 filter.
By These characteristics, the phase unbalance degree of signal and amplitude imbalance degree can be guaranteed simultaneously.In the present embodiment, consider the phase fluctuation of inverter bridge itself and the impact that distributes loss fluctuation, the phase unbalance degree of antenna-feedback system access device can be accomplished≤4 ° (homophase or anti-phase), can accomplish≤0.2dB of amplitude imbalance degree.
In the present embodiment, inverter bridge is 180 ° of 3dB electric bridges.
The antenna-feedback system access device of the present embodiment also can be applicable to the diversity reception of signal, and its operation principle is as follows:
First ANT1 port and ANT2 port difference input aerial receive reception signal 1 and reception signal 2.Then, receive signal 1 and export from TX1/RX1 port through RX1 filter, receive signal 2 and export from TX2/RX2 port through RX2 filters.Finally enter BTS, the receive diversity of settling signal.
Compared with prior art, when receiving signal 1 or receiving signal 2 through antenna-feedback system access device, only need a receiving filter, thereby can reduce the wastage, simplify the circuit design of antenna-feedback system access device.
Wherein, in the present embodiment antenna-feedback system access device, by TX1, TX2, TX3, TX4 filter, can carry out filtering and provide sufficiently high transmitting-receiving to isolate transmitting before and after shunt; By RX1 filter and RX2 filter, can be respectively to received signal 1 and receive signal 2 and carry out filtering and sufficiently high transmitting-receiving isolation is provided, thus reach the object of diversity reception.
Refer to Fig. 4, antenna-feedback system one embodiment of the present invention, comprising: antenna 41, antenna-feedback system access device 42 and base transceiver station 43.
Wherein, antenna-feedback system access device 42 is connected to antenna 41 and base transceiver station 43.
Wherein, the structure of antenna-feedback system access device 42 is identical with the antenna-feedback system access device shown in Fig. 3, does not repeat them here.
Wherein, antenna 41 is ± 45 ° of cross polarised antennas.
In the present embodiment, antenna-feedback system function is as follows:
A. antenna-feedback system is used for signal process antenna-feedback system access device 42, the antenna 41 of base transceiver station 43 transmittings, and making to transmit is superimposed as perpendicular polarization signal or horizontal polarization signal in space; Wherein, transmit as the signal of a plurality of signal source transmittings in base transceiver station 43.
B. signal process antenna-feedback system access device 42, the base transceiver station 43 of antenna-feedback system for antenna 41 is received, makes to receive signal and realizes diversity reception; Wherein, receiving signal is multipath reception signal.
Compared with prior art, antenna-feedback system access device of the present invention adopts the mode of coaxial cavity filter and built-in inverter bridge, the function of common electric bridge in prior art, 90 ° of phase shifters and filter is integrated, save electric bridge of the prior art, 90 ° of phase shifters and cable.Meanwhile, antenna-feedback system access device of the present invention only comprises two receiving filters.By said structure, antenna-feedback system access device of the present invention is except distributing loss, and the insertion loss of each transmitting path only has the insertion loss of corresponding two TX filters, and the insertion loss of each receiving path only has the insertion loss of a RX filter.Meanwhile, utilize coaxial cavity filter of the present invention to be convenient to the advantage of debugging, its amplitude imbalance degree and phase unbalance degree are all easily adjusted easily control.In addition, because access device of the present invention has been avoided complicated connection, can significantly reduce device volume, reduce costs, be suitable for producing in enormous quantities.Meanwhile, also can improve multinomial important indicator, as improved, rear system standing-wave ratio is little, insertion loss is little, passive intermodulation is low, interport isolation is high, power capacity is large etc.
In sum, antenna-feedback system access device of the present invention utilizes inverter bridge to replace general electric bridge and 90 ° of phase shifters of prior art, and access device only needs two receiving filters simultaneously, and in the connection procedure of each device, cancels the connected mode of cable.By said structure, the present invention can reduce the volume of antenna-feedback system access device, simplifies the implementation of antenna-feedback system access device, reduces amplitude imbalance degree and the phase unbalance degree of merit sub-signal simultaneously, and improves all other performance index.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (11)
1. an antenna-feedback system access device, is characterized in that, comprises the first filter, the second filter and inverter bridge;
Wherein, described the first filter comprises the first emission filter, the second emission filter and the first receiving filter; Described the second filter comprises the 3rd emission filter, the 4th emission filter and the second receiving filter; Described inverter bridge is connected to described the first emission filter, the second emission filter, the 3rd emission filter and the 4th emission filter.
2. antenna-feedback system access device according to claim 1, is characterized in that, described antenna-feedback system access device also comprises: first day line cap, second day line cap, the first reception/emission port and the second reception/emission port;
Wherein, described first day line cap, the first reception/emission port are connected to the first filter; Described second day line cap, the second reception/emission port are connected to the second filter.
3. antenna-feedback system access device according to claim 2, it is characterized in that, described inverter bridge has the first port, the second port, the 3rd port and the 4th port, for exporting from described the first port and the second port after dividing from the signal merit of the 3rd port, will be from described the first port and the output of the second port after dividing from the signal merit of the 4th port.
4. antenna-feedback system access device according to claim 3, it is characterized in that, the first port of described inverter bridge, the second port, the 3rd port and the 4th port respectively with described the first emission filter, the 3rd emission filter, the second emission filter is connected with the 4th emission filter, wherein, signal through described the second emission filter feed-in inverter bridge the 3rd port, by described inverter bridge merit, being divided into phase difference is from the first port and second port of inverter bridge, to export respectively after the two paths of signals of 0 °, then respectively via the first emission filter and the output of the 3rd emission filter, signal through described the 4th emission filter feed-in inverter bridge the 4th port, by described inverter bridge merit, being divided into phase difference is from the first port and second port of inverter bridge, to export respectively after the two paths of signals of 180 °, then respectively via the first emission filter and the output of the 3rd emission filter.
5. antenna-feedback system access device according to claim 4, it is characterized in that, between described inverter bridge, the first emission filter and first day line cap, between the topological structure of signal transmission path and described inverter bridge, the 3rd emission filter and second day line cap, the topological structure of signal transmission path is identical.
6. antenna-feedback system access device according to claim 5, is characterized in that, described the first emission filter is identical with the physical structure of the 3rd emission filter.
7. antenna-feedback system access device according to claim 6, it is characterized in that, described the first emission filter, the second emission filter, the 3rd emission filter are identical with the 4th emission filter frequency range, are the transmit frequency band of described the first filter and the second filter.
8. antenna-feedback system access device according to claim 7, is characterized in that, described the first receiving filter is identical with the frequency range of the second receiving filter, is the reception frequency range of described the first filter and the second filter.
9. an antenna-feedback system, is characterized in that, comprising: antenna, antenna-feedback system access device and base transceiver station, and described antenna-feedback system access device is connected to antenna and base transceiver station;
Wherein, described antenna-feedback system access device comprises the first filter, the second filter and inverter bridge; Described the first filter comprises the first emission filter, the second emission filter and the first receiving filter; Described the second filter comprises the 3rd emission filter, the 4th emission filter and the second receiving filter; Described inverter bridge is connected to described the first emission filter, the second emission filter, the 3rd emission filter and the 4th emission filter.
10. antenna-feedback system according to claim 9, it is characterized in that, described antenna-feedback system, for by the described antenna-feedback system access device of signal process, the antenna of described base transceiver station transmitting, transmits described in making and in space, is superimposed as perpendicular polarization signal or horizontal polarization signal;
Wherein, described in, transmit as the signal of a plurality of signal source transmittings in base transceiver station.
11. antenna-feedback systems according to claim 10, is characterized in that, described antenna-feedback system, for by the described antenna-feedback system access device of signal process, the base transceiver station of described antenna reception, makes described reception signal realize diversity reception;
Wherein, described reception signal is multipath reception signal.
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| WO2015158221A1 (en) * | 2014-04-14 | 2015-10-22 | 华为技术有限公司 | Combiner, base station, signal combiner system and signal transmission method |
| CN111869115A (en) * | 2018-04-06 | 2020-10-30 | 华为技术有限公司 | Duplex filter device with leakage elimination function |
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