CN203288755U - RoF-type phase control active integrated antenna array suitable for FDD system - Google Patents
RoF-type phase control active integrated antenna array suitable for FDD system Download PDFInfo
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- CN203288755U CN203288755U CN2013201791256U CN201320179125U CN203288755U CN 203288755 U CN203288755 U CN 203288755U CN 2013201791256 U CN2013201791256 U CN 2013201791256U CN 201320179125 U CN201320179125 U CN 201320179125U CN 203288755 U CN203288755 U CN 203288755U
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Abstract
The utility model discloses a RoF-type phase control active integrated antenna array suitable for a FDD system comprising an optical module, an intermediate frequency transceiving module, a radio frequency transceiving module, and antenna units. The optical module connected with a near-end machine is connected with a plurality of radio frequency transceiving modules by the intermediate frequency transceiving module, and each of the radio frequency transceiving modules is connected with an antenna unit. Compared to the traditional array antenna, the RoF-type phase control active integrated antenna array is advantageous in that each of the antenna units of the active integrated antenna array is directly connected with a complete radio frequency transceiving module, and the shunting/combining of the signals of the units can be completed, and then the signals can be connected with optical module after being processed by the intermediate frequency transceiving module, and at last, the signals can be converted into the optical signals by the optical module for the long-distance low-loss transmission; phases of the radio frequency transceiving modules behind the antenna units are controllable, and therefore the wave beam of the whole array can be scanned in the vertical direction.
Description
Technical field
The utility model relates to a kind of active antenna, is a kind of FDD(Frequency of being applicable to Division Duplexing specifically, Frequency Division Duplexing (FDD)) the phased active integrated antenna array of RoF type of system.
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 efficiency etc.The loss meeting of the insertion loss of the conductor losses of antenna radiation unit, dielectric loss, feeding network and feeder line reduces the efficiency of whole system greatly, thereby cause the transmitter power of significant proportion to be dissipated by antenna and feeder line, and have a strong impact on receiving sensitivity.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 comprised of antenna, feeder cable and radio-frequency (RF) transceiver, and the antenna of tower top is connected with following transceiver by the feeder cable of certain-length.For down link, the power output of radio frequency sending set is installed on the antenna of tower top by the feeder cable feed-in and is transmitted into aerial; , for up link, after being received by the tower top antenna for base station, mobile phone signal enters radio-frequency transmitter under tower by 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 consists 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 efficiency 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 and
Analyze the performance of wireless communication system.For this reason, we to define antenna feeder efficiency as follows
In formula, E
AFExpression antenna feeder efficiency (Efficiency of Antenna and Feeding Cable), P
eRefer to really be radiated aerial Effective Radiated Power, P
tRefer to 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, and is even larger; The common approximately 1～2dB of the loss of the inner feeding network of antenna sector.By contrast, the reflection loss the when conductor losses of radiating element, dielectric loss and matched well is much smaller.Therefore, from the power of radio frequency sending set output, only less than half, be radiated, that is to say the antenna feeder efficiency E of this moment
AF＜50%.We know, in the situation that guarantee that linearity radio frequency sending set power output doubles, its cost will increase by 0.8～1 times, and its dc power will increase by 1～1.2 times.
Therefore, study and realize that high efficiency, wave beam are controlled, low-power consumption, low cost and support the new antenna technology of the various good characteristics of RoF (Radio over Fiber, light carrier radio communication) to seem very urgent.
The utility model content
Utility model purpose: for the problem and shortage of above-mentioned prior art existence, the purpose of this utility model is to provide a kind of phased active integrated antenna array of RoF type of the FDD of being applicable to system, make the beam position of its transmission channel and receive path in vertical plane independent controlled, energy-efficient.
Technical scheme: for realizing above-mentioned utility model purpose, the technical solution adopted in the utility model is a kind of phased active integrated antenna array of RoF type that is applicable to the FDD system, and it comprises optical module, medium-frequency receiving and sending module, radio-frequency (RF) receiving and transmission module and antenna element; The optical module that is connected with near-end machine is connected with a plurality of radio-frequency (RF) receiving and transmission module by the medium-frequency receiving and sending module, and each radio-frequency (RF) receiving and transmission module is connected with an antenna element.
Wherein, described medium-frequency receiving and sending module comprises the transmitter module that is connected with optical module, and transmitter module is connected with the input of intermediate frequency power splitter; The medium-frequency receiving and sending module also comprises the receiver module that is connected with optical module, and receiver module is connected with the output of middle frequency combiner; The output of described intermediate frequency power splitter is connected with the feed port of antenna element by radio-frequency (RF) receiving and transmission module; The feed port of described antenna element also is connected with the input of middle frequency combiner by radio-frequency (RF) receiving and transmission module.
Wherein, described radio-frequency (RF) receiving and transmission module comprises the first frequency mixer, the first phase shifter, amplifier and the duplexer that is connected with the intermediate frequency power splitter successively, and the other end of duplexer is connected with the feed port of antenna element; The feed port of antenna element also connects Receiver Module, the second phase shifter and the second frequency mixer successively by duplexer, and the second frequency mixer is connected with the input of middle frequency combiner.
The phased active integrated antenna array of the RoF type of the FDD of being applicable to system of the present utility model 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 from traditional array antenna, in active integrated antenna array in the utility model, each antenna element directly directly is connected with a complete radio-frequency (RF) receiving and transmission module, the signal of unit is completed merit Fen/He road on intermediate frequency, by being connected with optical module after the medium-frequency receiving and sending module, last signal can be converted to after light signal the low-loss transmission of growing distance by optical module.The phase place of the radio-frequency (RF) receiving and transmission module after each antenna element is controlled, and the wave beam of whole like this array just can scan in the vertical direction.
Beneficial effect: the utlity model has following advantage:
1 :) have higher antenna feeder efficiency, can reach 80%～90%.After adopting the design of active integrated antenna array, radio-frequency (RF) receiving and transmission module directly is connected with antenna element by joint, avoided the loss that in traditional RRU+ passive antenna array scheme, feeder cable brings, to complete at intermediate frequency because the road network network is divided/closed to merit simultaneously, the road network network is divided/closed to radio frequency merit than the passive antenna array, the loss meeting further reduces, and whole loss can be controlled in 1dB, and the antenna feeder efficiency of system can reach 80%～90%.
2 :) wave beam that transmits and receives passage in vertical plane can independently scan, and wave beam can point to any direction in ± 40 ° of scopes.The radio-frequency (RF) receiving and transmission module of this programme is compared traditional RRU(Radio Remote Unit, Remote Radio Unit), each passage has increased a high accuracy low-loss digital phase shifter, the phase place of each unit in aerial array can be set by the control to phase shifter, the phase place of each antenna element is arranged on suitable numerical value can controls the orientation that the beam position of whole aerial array needs, thereby realize the beam scanning of array beams in vertical plane.Because in radio-frequency (RF) receiving and transmission module, the phase shifter of reception and transmission channel is independent controlled, it is also independent controlled that the reception of system and launching beam point to.
3) have benefited from the beam position of aerial array controlled, when in aerial array, one or several passages break down, can be by regulating the phase place of remaining channel, the radiation beam of aerial array is pointed to and adjusted, can make up the change of the aerial radiation direction of bringing because of channel failure, strengthen to a certain extent the stability of system.
4) adopt RoF, can carry out low-loss transmission, networking is convenient.
Description of drawings
Fig. 1 is the structural representation that the utility model is applicable to the phased active integrated antenna array of RoF type of FDD system;
Fig. 2 is the beam scanning (take 10 ° as interval, beam position can customize) of antenna reception passage of the present utility model;
Fig. 3 is the beam scanning (take 10 ° as interval, beam position can customize) of antenna transmission passage of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only is used for explanation the utility model and is not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.
As shown in Figure 1, a kind of phased active integrated antenna array of RoF type that is applicable to the FDD system of the present utility model, comprise optical module 1, medium-frequency receiving and sending module 2, radio-frequency (RF) receiving and transmission module 3 and antenna element 4; The optical module 1 that is connected with near-end machine is connected with some radio-frequency (RF) receiving and transmission module 3 by medium-frequency receiving and sending module 2, and each radio-frequency (RF) receiving and transmission module 3 is connected with an antenna element 4.Power supply is the phased active integrated antenna power supply of whole ROF type, and optical module 1 is connected with the optical module of near-end machine by optical fiber.
The effect of optical module 1 is opto-electronic conversion, and transmitting terminal converts the signal of telecommunication to light signal; After transmitting by optical fiber, receiving terminal converts light signal to the signal of telecommunication again.
Radio-frequency (RF) receiving and transmission module 3 is cores of active integrated antenna array, and the intermediate-freuqncy signals that radiating portion carrys out intermediate frequency power splitter 22 transmission pass to antenna element 4 after upconverting to after rf frequency and carrying out filtering, phase shift and amplification; After the weak signal that Receiver Module 37 carrys out antenna element 4 transmission is carried out filtering and amplification, and be down-converted to IF-FRE, then the signal of each passage is completed and is closed road in middle frequency combiner 24 the insides.
Antenna element 4 is energy conversion devices, the signal of radiofrequency emitting module 3 generations is converted to electromagnetic wave is transmitted into space, and with being converted to radiofrequency signal after the collection of the electromagnetic wave in space, pass to Receiver Module 3.
Wherein, described medium-frequency receiving and sending module 2 comprises the transmitter module 21 that is connected with optical module 1, and transmitter module 21 is connected with the input of intermediate frequency power splitter 22; Medium-frequency receiving and sending module 2 also comprises the receiver module 23 that is connected with optical module 1, and receiver module 23 is connected with the output of middle frequency combiner 24.
Described radio-frequency (RF) receiving and transmission module 3 comprises the first frequency mixer 31, the first phase shifter 32, amplifier 33, the duplexer 34 that is connected with intermediate frequency power splitter 22 successively; The other end of duplexer 34 is connected with the feed port of antenna element 4; The feed port of antenna element 4 also connects successively Receiver Module 37, the second phase shifter 36, the second frequency mixer 35, the second frequency mixers 35 by duplexer 34 and is connected with the input of middle frequency combiner 24.The first frequency mixer 31, the first phase shifter 32, amplifier 33, duplexer 34 have formed the radiating portion of radio-frequency (RF) receiving and transmission module 3, and the second frequency mixer 35, the second phase shifter 36, Receiver Module 37 and duplexer 34 have formed the receiving unit of radio-frequency (RF) receiving and transmission module 3.
The output of intermediate frequency power splitter 22 is connected with the feed port of antenna element 4 by radio-frequency (RF) receiving and transmission module 3; The feed port of described antenna element 4 is connected with the input of middle frequency combiner 24 by radio-frequency (RF) receiving and transmission module 3.
Radio-frequency (RF) receiving and transmission module 3 by phase shifter can the control antenna array in the phase place of each passage, the phase place of each passage is arranged on suitable numerical value can controls the orientation that the beam position of whole aerial array needs, thereby realize the beam scanning in vertical plane.
each antenna element 4 of the present utility model with one independently radio-frequency (RF) receiving and transmission module 3 directly be connected, with traditional RRU(radio frequency remoto module)+the passive antenna array compares, EIRP(effective isotropic radiated power at the whole aerial array of assurance) under identical condition, the radio frequency power output that in this programme, the single radio frequency transmitter module needs is only the number of aerial array for the 1/N(N of traditional RRU scheme intermediate power amplifier power output, be generally 8-12), so just can adopt middle-size and small-size power amplifier to replace high power amplifier in common RRU scheme, reduced the requirement of system to the heat radiation aspect, and can further reduce cost and the circuit area of system, , because the reduction of maximum transmission power can reduce the requirement to the power capacity of duplexer in the FDD system, further reduce cost and the volume of system simultaneously.
Compare traditional RRU, each passage of radio-frequency (RF) receiving and transmission module of the present utility model has increased a digital phase shifter, the phase place of each unit in aerial array can be set by the control to phase shifter, the phase place of each antenna element is arranged on suitable numerical value can controls the orientation that the beam position of whole aerial array needs, thereby realize the beam scanning of array beams in vertical plane.
The phase place of the radio-frequency (RF) receiving and transmission module 3 of the phased active integrated antenna array of RoF type of the present utility model can be controlled, and, by specific phase place is set, can so that the angle that the beam position of array in vertical plane needs, realize the function of beam scanning.And radio-frequency (RF) receiving and transmission module 3 directly is connected with antenna element 4 by joint, has reduced the loss of feeder line and feeding network, has improved antenna feeder efficiency.
Further illustrate below in conjunction with an embodiment antenna of the present utility model, this embodiment antenna is the phased active integrated antenna of RoF type that is applicable to the WCDMA system, its radio-frequency transmissions working frequency range is 2110MHz～2170MHz, the reception operating frequency is 1920MHz～1980MHz, system works is at fdd mode, transceiver channel is isolated by duplexer, array is that unit 8 is uniformly distributed linear array, each radio frequency unit maximum transmission power is 21dBm, the gain of antenna element is 7dB, and the EIRP of whole array maximum is the loss of 45.5dBm(0.5dB).The radiation beam of array is 10 ° at the 3dB of vertical plane beamwidth, can point to arbitrarily angled in ± 40 ° of scopes.
Fig. 2 and Fig. 3 are the beam scanning result of the utility model antenna, during measurement take 10 ° as interval, actually can point to arbitrarily angledly, from test result, can find out, the position that requires all can be accurately pointed in the beam scanning that transmits and receives passage in ± 40 ° of scopes.
Fig. 2 and Fig. 3 have provided the embodiment active antenna in the beam scanning result that transmits and receives under state, as can be seen from the results, the wave beam of this active integrated antenna array can need to be adjusted according to system 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 according to service needed in good time, obtain optimization and cover; And have benefited from the beam position controllable characteristics of aerial array, when in this embodiment aerial array, one or several passages break down, can be by regulating the phase place of remaining channel, beam position to aerial array is adjusted, make up the change of the aerial radiation direction of bringing because of channel failure, strengthened to a certain extent the stability of system.
Claims (3)
1. phased active integrated antenna array of RoF type that is applicable to the FDD system, it is characterized in that: it comprises optical module (1), medium-frequency receiving and sending module (2), radio-frequency (RF) receiving and transmission module (3) and antenna element (4); The optical module that is connected with near-end machine (1) is connected with a plurality of radio-frequency (RF) receiving and transmission module (3) by medium-frequency receiving and sending module (2), and each radio-frequency (RF) receiving and transmission module (3) is connected with an antenna element (4).
2. be applicable to according to claim 1 the phased active integrated antenna array of RoF type of FDD system, it is characterized in that: described medium-frequency receiving and sending module (2) comprises the transmitter module (21) that is connected with optical module (1), and transmitter module (21) is connected with the input of intermediate frequency power splitter (22); Medium-frequency receiving and sending module (2) also comprises the receiver module (23) that is connected with optical module (1), and receiver module (23) is connected with the output of middle frequency combiner (24);
The output of described intermediate frequency power splitter (22) is connected with the feed port of antenna element (4) by radio-frequency (RF) receiving and transmission module (3); The feed port of described antenna element (4) also is connected with the input of middle frequency combiner (24) by radio-frequency (RF) receiving and transmission module (3).
3. be applicable to according to claim 2 the phased active integrated antenna array of RoF type of FDD system, it is characterized in that: described radio-frequency (RF) receiving and transmission module (3) comprises the first frequency mixer (31), the first phase shifter (32), amplifier (33) and the duplexer (34) that is connected with intermediate frequency power splitter (22) successively, and the other end of duplexer (34) is connected with the feed port of antenna element (4); The feed port of antenna element (4) also connects Receiver Module (37), the second phase shifter (36) and the second frequency mixer (35) successively by duplexer (34), and the second frequency mixer (35) also is connected with the input of middle frequency combiner (24).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201791256U CN203288755U (en) | 2013-04-10 | 2013-04-10 | RoF-type phase control active integrated antenna array suitable for FDD system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013201791256U CN203288755U (en) | 2013-04-10 | 2013-04-10 | RoF-type phase control active integrated antenna array suitable for FDD system |
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Cited By (2)
| 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 |
| CN110741277A (en) * | 2019-04-22 | 2020-01-31 | 深圳市速腾聚创科技有限公司 | Phased array transmitting array, phased array receiving array, radar and intelligent induction equipment |
-
2013
- 2013-04-10 CN CN2013201791256U patent/CN203288755U/en not_active Expired - Fee Related
Cited By (2)
| 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 |
| CN110741277A (en) * | 2019-04-22 | 2020-01-31 | 深圳市速腾聚创科技有限公司 | Phased array transmitting array, phased array receiving array, radar and intelligent induction equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131113 Termination date: 20180410 |
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| CF01 | Termination of patent right due to non-payment of annual fee |