CN102769212A - Medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna - Google Patents
Medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna Download PDFInfo
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- CN102769212A CN102769212A CN2012102569075A CN201210256907A CN102769212A CN 102769212 A CN102769212 A CN 102769212A CN 2012102569075 A CN2012102569075 A CN 2012102569075A CN 201210256907 A CN201210256907 A CN 201210256907A CN 102769212 A CN102769212 A CN 102769212A
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Abstract
The invention discloses a medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna, which comprises a simulated light module, a medium-frequency transceiver module, radio transceiver modules and antenna units, wherein the simulated light module connected with a near-end machine is connected with the radio transceiver modules through the medium-frequency transceiver module; and each radio transceiver module is connected with one antenna unit. Different from the conventional array antenna, the medium-frequency simulated RoF type phase control active integrated antenna has the characteristics that each antenna unit in the active integrated antenna array is directly connected with one complete radio transceiver module, and a signal of each unit is subjected to power distribution/combination on the medium frequency, passes through the medium-frequency transceiver module and is connected with the light module and finally converted into a light signal through the light module for long-distance low-loss transmission; and the phase of the radio transceiver module behind each antenna unit is controllable, so that the wave beam of the whole array can be scanned in the perpendicular direction.
Description
Technical field
The present invention relates to a kind of active antenna, is the phased active integral antenna of a kind of intermediate frequency simulation RoF type specifically.
Background technology
Antenna is one of critical component of various wireless communication systems, and weighing its good and bad the key technical indexes has: impedance bandwidth, beamwidth, minor level, gain and efficient etc.The insertion loss of the conductor losses of antenna radiation unit, dielectric loss, feeding network and the loss meeting of feeder line reduce overall system efficiency greatly; Thereby cause the transmitter power of significant proportion to be dissipated, and have a strong impact on receiving sensitivity by antenna and feeder line.Therefore, high efficiency and the intelligent goal in research that just becomes the next generation wireless communication antenna.
Traditional cellular mobile communication base station mainly is made up of antenna, feeder cable and RF transceiver, and the antenna of cat head is connected with following transceiver through the feeder cable of certain-length.For down link, the power output of radio frequency sending set is installed on the antenna of cat head through the feeder cable feed-in and is transmitted into aerial; For up link, mobile phone signal is received the back by the cat head antenna for base station and gets into the radio-frequency transmitter under the tower through feeder cable.The traditional base station antenna adopts the directional antenna of covering of the fan antenna pattern mostly, and the horizontal plane beamwidth is generally 120 degree (10dB beamwidth), and gain generally is about 14.5dBi.Such antenna generally is made up of 8 ~ 12 cellular arraies of vertical direction.The loss meeting of the Insertion Loss of the conductor losses of antenna radiation unit, dielectric loss, feeding network and feeder line reduces the efficient of antenna-feedback system greatly, thereby causes the transmitter power of significant proportion to be dissipated by antenna and feeder line, and has a strong impact on receiving sensitivity.Antenna efficiency is not taken into account the loss of feeder cable, obviously for above-mentioned base station, with antenna and feeder line (that is: antenna-feedback system) whole consider to be more suitable for describing with
Analyze the performance of wireless communication system.For this reason, we to define antenna feeder efficient following
In the formula, E
AFExpression antenna feeder efficient (Effciency of Antenna and Feeding Cable), P
eBe meant and really be radiated aerial Effective Radiated Power, P
tBe meant the power output of radio frequency sending set.
For traditional base station and base station antenna sector situation, feeder line length can reach tens meters usually, and loss can reach 3dB, even bigger; The loss of the inner feeding network of antenna sector is about 1 ~ 2dB usually.By contrast, the reflection loss the when conductor losses of radiating element, dielectric loss and matched well is much smaller.Therefore, the power of exporting from radio frequency sending set is only radiate less than half, that is to say the antenna feeder efficient E of this moment
AF<50%.We know that the radio frequency sending set power output doubles under the situation that guarantees the linearity, and its cost will increase by 0.8 ~ 1 times, and its dc power will increase by 1 ~ 1.2 times.
For head it off; People begin a large amount of cat head radio-frequency techniques that adopt in practical application; Be about to part radio frequency or whole Radio Frequency Subsystem and place near the cat head antenna, so just can feeder cable be compressed to about 1m, loss tapers to 1dB with interior (comprising splicing loss).Adopt after this technology, obviously can the loss of antenna-feedback system be reduced to below the 3dB, thereby can make antenna feeder efficient reach 50% ~ 70%.
Recently, active integral antenna becomes the research focus, and its basic thought is that feeder cable is all removed, and incites somebody to action part or whole Radio Frequency Subsystem and antenna and integrates.The feeding network of considering aerial array still exists, adopt active integral antenna technology after, antenna feeder efficient can be brought up to about 80%.
Except efficient, also often require antenna for base station directional diagram angle of declination to transfer by electricity in the reality.But even directional diagram vertical plane figuration, horizontal plane can scan also to be expected.
Therefore, research and realize that high efficiency, wave beam are controlled, the new antenna technology of the various good characteristics of low-power consumption, low cost and support RoF (Radio over Fiber) seems very urgent.
Summary of the invention
Goal of the invention: the objective of the invention is to design a kind of energy-efficient active integral antenna, make its wave beam in vertical plane controlled, and support RoF.
Technical scheme: in order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
The phased active integral antenna array of a kind of intermediate frequency simulation RoF type, it comprises simulated light module, medium-frequency receiving and sending module, RF receiving and transmission module and antenna element; The simulated light module that links to each other with the near-end machine links to each other with some RF receiving and transmission modules through the medium-frequency receiving and sending module, and each RF receiving and transmission module is connected with an antenna element.
Wherein, described medium-frequency receiving and sending module comprises the transmitter module that links to each other with the simulated light module, and transmitter module links to each other with the intermediate frequency power splitter; The medium-frequency receiving and sending module also comprises the receiver module that links to each other with the simulated light module, and receiver module links to each other with middle frequency combiner; The output of described intermediate frequency power splitter links to each other with the feed port of antenna element through RF receiving and transmission module; The feed port of described antenna element also links to each other with the input of middle frequency combiner through RF receiving and transmission module.
Wherein, described RF receiving and transmission module comprises a frequency mixer that links to each other with the intermediate frequency power splitter successively, phase shifter, amplifier and a RF switch, and the other end of RF switch links to each other with the feed port of antenna element; The feed port of antenna element also connects Receiver Module, No. two phase shifters, No. two frequency mixers through RF switch successively, and No. two frequency mixer links to each other with middle frequency combiner.
The phased active integral antenna of intermediate frequency simulation RoF type of the present invention comprises antenna element, radio-frequency receiving-transmitting, phase shifter, frequency mixer, medium-frequency receiving and sending and optical module, and wherein the medium-frequency receiving and sending module has comprised intermediate frequency power splitter/mixer and amplification circuits; Different with traditional array antenna; Each antenna element all directly directly is connected with a complete RF receiving and transmission module in the active integral antenna array among the present invention; The signal of each unit is accomplished merit branch/close road on intermediate frequency; Through being connected with optical module after the medium-frequency receiving and sending module, last signal can convert the low-loss transmission of growing distance behind the light signal into through optical module.The phase place of the RF receiving and transmission module behind each antenna element is controlled, and the wave beam of whole like this array just can scan in vertical direction.
Beneficial effect: the present invention has the following advantages:
1 :) have higher antenna feeder efficient, can reach 80%～90%.After adopting the design of active integral antenna array, penetrate
Frequently transceiver module directly is connected with antenna element through joint; Avoided the loss that feeder cable brings in the traditional RRU+ passive antenna array scheme; Simultaneously because the merit branch/to close the road network network be to accomplish at intermediate frequency, than the radio frequency merit branch of passive antenna array/close the road network network, the loss meeting further reduces; Whole loss can be controlled in the 1dB, and the antenna feeder efficient of system can reach 80%～90%.
2 :) wave beam can scan in the vertical plane, and wave beam can point to any direction in ± 40 ° of scopes.Penetrating of this programme
Frequently transceiver module is compared traditional RRU; Each passage has all increased a high accuracy low-loss digital phase shifter; Through the phase place of each unit in the aerial array can be set the control of phase shifter; The phase place of each antenna element is arranged on the orientation that suitable numerical value can be controlled the beam position needs of entire antenna array, thereby realizes the beam scanning of array beams in vertical plane.
3) it is controlled to have benefited from the beam position of aerial array; When one or several passages break down in the aerial array; Can be through regulating the phase place of remaining channel; Radiation beam sensing to aerial array is adjusted, and can remedy the change of the aerial radiation direction of bringing because of channel failure, has strengthened the stability of system to a certain extent.
4) adopt intermediate frequency simulation RoF, can carry out low-loss transmission, networking is convenient.
Description of drawings
Fig. 1 is the structural representation of the phased active integral antenna of intermediate frequency simulation RoF type of the present invention,
Fig. 2 is that antenna of the present invention works in the beam scanning (is the interval with 10 °) under the emission state
Fig. 3 is that antenna of the present invention works in the beam scanning (is the interval with 10 °) under the accepting state
Embodiment:
Below in conjunction with accompanying drawing the present invention is done explanation further.
As shown in Figure 1, the phased active integral antenna array of a kind of intermediate frequency simulation RoF type of the present invention comprises simulated light module 1, medium-frequency receiving and sending module 2, RF receiving and transmission module 3 and antenna element 4; The simulated light module 1 that links to each other with the near-end machine links to each other with some RF receiving and transmission modules 3 through medium-frequency receiving and sending module 2, and each RF receiving and transmission module 3 is connected with an antenna element 4.Power supply is the phased active integral antenna power supply of whole intermediate frequency simulation ROF type, and simulated light module 1 links to each other with the simulated light module of near-end machine through optical fiber.
The effect of simulated light module 1 is an opto-electronic conversion, and transmitting terminal becomes light signal to electrical signal conversion; After the optical fiber transmission, receiving terminal converts light signal to the signal of telecommunication again.
RF receiving and transmission module 3 is cores of active integral antenna array, and the intermediate-freuqncy signal that radiating portion comes intermediate frequency power splitter 22 transmission passes to antenna element 4 after upconverting to and carrying out filtering, phase shift and amplification behind the rf frequency; After the weak signal that Receiver Module 37 comes antenna element 4 transmission is carried out filtering and amplified, and be down-converted to IF-FRE, the signal of each passage is accomplished in middle frequency combiner 24 the insides and is closed the road then.
Antenna element 4 is energy conversion devices, and the conversion of signals that radiofrequency emitting module 3 is produced is that electromagnetic wave is transmitted into the space, and converts radiofrequency signal into after the electromagnetic wave in space collected and pass to Receiver Module 3.
Wherein, described medium-frequency receiving and sending module 2 comprises the transmitter module 21 that links to each other with simulated light module 1, and transmitter module 21 links to each other with intermediate frequency power splitter 22; Medium-frequency receiving and sending module 2 also comprises the receiver module 23 that links to each other with simulated light module 1, and receiver module 23 and middle frequency combiner 24 connect mutually.
Described RF receiving and transmission module 3 comprises a frequency mixer linking to each other with intermediate frequency power splitter 22 successively 31, phase shifter 32, amplifier 33, RF switch 34; The other end of RF switch 34 links to each other with the feed port of antenna element 4; The feed port of antenna element 4 also through RF switch 34 connect Receiver Module 37, No. two phase shifters 36 successively, No. two 35, No. two frequency mixers 35 of frequency mixer link to each other with middle frequency combiner 24.Frequency mixer 31, phase shifter 32, amplifier 33, a RF switch 34 have been formed the radiating portion of RF receiving and transmission module 3, and No. two frequency mixers 35, No. two phase shifters 36, Receiver Module 37 and RF switches 34 have been formed the receiving unit of RF receiving and transmission module 3.Wherein, RF switch 37 can be common switch or duplexer, and described Receiver Module 37 comprises filter circuit and the amplifier that links to each other with RF switch 34 successively.
The output of intermediate frequency power splitter 22 links to each other with the feed port of antenna element 4 through RF receiving and transmission module 3; The feed port of described antenna element 4 links to each other with the input of middle frequency combiner 24 through RF receiving and transmission module 3.
RF receiving and transmission module 3 through phase shifter can the control antenna array in the phase place of each passage; The phase place of each passage is arranged on the orientation that suitable numerical value can be controlled the beam position needs of entire antenna array, thereby realizes the beam scanning in the vertical plane.
Each antenna element 4 of the present invention all with one independently RF receiving and transmission module 3 directly be connected; Compare with traditional RRU (radio frequency remoto module)+passive antenna array; Under the identical condition of the EIRP (effective isotropic radiated power) that guarantees the entire antenna array; The radio frequency power output that the single radio frequency transmitter module needs in this programme is merely the 1/N of traditional RRU scheme intermediate power amplifier power output, and (N is the number of aerial array; Be generally 8-12); So just can adopt middle-size and small-size power amplifier to replace the high power amplifier in the common RRU scheme, reduce the requirement of system, and can further reduce the cost and the circuit area of system the heat radiation aspect; Because the reduction of maximum transmission power can reduce the requirement to the power capacity of duplexer in the FDD system, further reduce the cost and the volume of system simultaneously.
Compare traditional RRU; Each passage of RF receiving and transmission module of the present invention has all increased a digital phase shifter; Through the phase place of each unit in the aerial array can be set the control of phase shifter; The phase place of each antenna element is arranged on the orientation that suitable numerical value can be controlled the beam position needs of entire antenna array, thereby realizes the beam scanning of array beams in vertical plane.
The phase place of the RF receiving and transmission module 3 of the phased active integral antenna of intermediate frequency of the present invention simulation RoF type can be controlled, and through specific phase place is set, can realize the function of beam scanning so that the angle that the beam position of array in vertical plane needs.And RF receiving and transmission module 3 directly is connected with antenna element 4 through joint, has reduced the loss of feeder line and feeding network, has improved antenna feeder efficient.
Further specify below in conjunction with one embodiment of the present of invention antenna; This embodiment antenna is the phased active integral antenna of intermediate frequency simulation RoF type, and its radio frequency operation frequency range is 2.3GHz～2.4GHz, and system works is at tdd mode; Transmitting-receiving is switched through switch; IF-FRE is 1GHz～1.1GHz, and array is the unit 8 linear array that evenly distributes, and each radio frequency unit maximum transmission power is 21dBm; The gain of antenna element is 7dB, and the maximum EIRP of whole array is 45.5dBm (loss of 0.5dB).The radiation beam of array is 10 ° at the 3dB of vertical plane beamwidth, can in ± 40 ° of scopes, point to arbitrarily angled.
Fig. 2 and Fig. 3 are the beam scanning result of antenna of the present invention; Be the interval with 10 ° during measurement; Actually can point to arbitrarily angledly, can find out that from test result the position that requires all can be accurately pointed in the beam scanning that transmits and receives under the state in ± 40 ° of scopes.
Fig. 2 and Fig. 3 have provided the embodiment active antenna in the beam scanning result who transmits and receives under the state; Can find out from the result; The wave beam of this active integral antenna array can be adjusted according to system's needs in vertical plane; When this embodiment antenna is used as the base station antenna system of mobile communication, can adjust the sensing of wave beam in good time, obtain optimization and cover according to service needed; And have benefited from the beam position controllable characteristics of aerial array; When one or several passages break down in this embodiment aerial array; Can be through regulating the phase place of remaining channel; Beam position to aerial array is adjusted, and remedies the change of the aerial radiation direction of bringing because of channel failure, has strengthened the stability of system to a certain extent.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (3)
1. an intermediate frequency is simulated the phased active integral antenna array of RoF type, and it is characterized in that: it comprises simulated light module (1), medium-frequency receiving and sending module (2), RF receiving and transmission module (3) and antenna element (4); The simulated light module (1) that links to each other with the near-end machine links to each other with some RF receiving and transmission modules (3) through medium-frequency receiving and sending module (2), and each RF receiving and transmission module (3) is connected with an antenna element (4).
2. the phased active integral antenna array of a kind of intermediate frequency simulation RoF type according to claim 1; It is characterized in that: described medium-frequency receiving and sending module (2) comprises the transmitter module (21) that links to each other with simulated light module (1), and transmitter module (21) links to each other with intermediate frequency power splitter (22); Medium-frequency receiving and sending module (2) also comprises the receiver module (23) that links to each other with simulated light module (1), and receiver module (23) and middle frequency combiner (24) mutually connect;
The output of described intermediate frequency power splitter (22) links to each other with the feed port of antenna element (4) through RF receiving and transmission module (3); The feed port of described antenna element (4) also links to each other with the input of middle frequency combiner (24) through RF receiving and transmission module (3).
3. the phased active integral antenna array of a kind of intermediate frequency simulation RoF type according to claim 2; It is characterized in that: described RF receiving and transmission module (3) comprises a frequency mixer (31), a phase shifter (32), amplifier (33) and the RF switch (34) that links to each other with intermediate frequency power splitter (22) successively, and the other end of RF switch (34) links to each other with the feed port of antenna element (4); The feed port of antenna element (4) also connects Receiver Module (37), No. two phase shifters (36), No. two frequency mixers (35) through RF switch (34) successively, and No. two frequency mixers (35) link to each other with middle frequency combiner (24).
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| CN2012102569075A CN102769212A (en) | 2012-07-24 | 2012-07-24 | Medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna |
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| CN2012102569075A CN102769212A (en) | 2012-07-24 | 2012-07-24 | Medium-frequency simulated RoF (radio over fiber) type phase control active integrated antenna |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103236587A (en) * | 2013-04-10 | 2013-08-07 | 东南大学 | RoF (radio over fiber) phased active integral antenna applicable to FDD (frequency division duplexing) system |
| CN110988501A (en) * | 2019-12-09 | 2020-04-10 | 北京航空航天大学 | Plane wave generator measuring system based on movable array antenna and applied to base station antenna production line |
| CN111342234A (en) * | 2018-12-19 | 2020-06-26 | 上海新岸线电子技术有限公司 | Base station electrically-controlled antenna |
| CN111668605A (en) * | 2020-07-02 | 2020-09-15 | 武汉虹信通信技术有限责任公司 | Electrically-controlled antenna used along high-speed rail |
| CN111710961A (en) * | 2019-03-18 | 2020-09-25 | Oppo广东移动通信有限公司 | Millimeter wave antenna module and electronic equipment |
| CN111725628A (en) * | 2019-03-18 | 2020-09-29 | Oppo广东移动通信有限公司 | Millimeter wave antenna module and electronic equipment |
| CN112510365A (en) * | 2021-01-29 | 2021-03-16 | 成都天锐星通科技有限公司 | Multi-beam feed network device and satellite system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236587A (en) * | 2013-04-10 | 2013-08-07 | 东南大学 | RoF (radio over fiber) phased active integral antenna applicable to FDD (frequency division duplexing) system |
| CN111342234A (en) * | 2018-12-19 | 2020-06-26 | 上海新岸线电子技术有限公司 | Base station electrically-controlled antenna |
| CN111710961A (en) * | 2019-03-18 | 2020-09-25 | Oppo广东移动通信有限公司 | Millimeter wave antenna module and electronic equipment |
| CN111725628A (en) * | 2019-03-18 | 2020-09-29 | Oppo广东移动通信有限公司 | Millimeter wave antenna module and electronic equipment |
| CN111725628B (en) * | 2019-03-18 | 2021-09-07 | Oppo广东移动通信有限公司 | Millimeter wave antenna module and electronic equipment |
| CN110988501A (en) * | 2019-12-09 | 2020-04-10 | 北京航空航天大学 | Plane wave generator measuring system based on movable array antenna and applied to base station antenna production line |
| CN111668605A (en) * | 2020-07-02 | 2020-09-15 | 武汉虹信通信技术有限责任公司 | Electrically-controlled antenna used along high-speed rail |
| CN111668605B (en) * | 2020-07-02 | 2021-07-09 | 中信科移动通信技术股份有限公司 | Electrically-controlled antenna used along high-speed rail |
| CN112510365A (en) * | 2021-01-29 | 2021-03-16 | 成都天锐星通科技有限公司 | Multi-beam feed network device and satellite system |
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Application publication date: 20121107 |