CN201853796U - Single-fed broadband circularly polarized laminated microstrip antenna and feed device thereof - Google Patents
Single-fed broadband circularly polarized laminated microstrip antenna and feed device thereof Download PDFInfo
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- CN201853796U CN201853796U CN2010205802881U CN201020580288U CN201853796U CN 201853796 U CN201853796 U CN 201853796U CN 2010205802881 U CN2010205802881 U CN 2010205802881U CN 201020580288 U CN201020580288 U CN 201020580288U CN 201853796 U CN201853796 U CN 201853796U
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- impedance matching
- microstrip antenna
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Abstract
The utility model discloses a single-fed broadband circularly polarized laminated microstrip antenna and a feed device thereof. An upper-layer radiation plate, a lower-layer radiation plate, an impedance matching plate and a floor are successively fixed via fixing screws so as to form the antenna, and by the aid of shaft sleeves arranged at the fixing screws among the upper-layer radiation plate, the lower-layer radiation plate, the impedance matching plate and the floor, air layer gaps among the upper-layer radiation plate, the lower-layer radiation plate, the impedance matching plate and the floor are kept. The feed device consists of an impedance matching plate, a feed probe and an input connector, and the impedance matching plate consists of two ring-shaped metal strips which are symmetric structures. By the aid of the technology, impedance and circularly polarized broadband of the microstrip antenna are increased, and accordingly, the single-fed broadband circularly polarized laminated microstrip antenna meets the technical requirements of mobile communication repeaters or ultra-high-frequency RFID (radio frequency identification device) systems of any countries of the world, has the advantages of low input voltage standing wave ratio, high gain and low cost, and is applicable to being widely popularized in the field of mobile communication.
Description
Technical field
The utility model belongs to electronic technology field, relates to a kind of single broadband circle polarized stacked microstrip antenna of feedback and feeder equipment thereof.This antenna can be applicable to Mobile communication direct base station or ultrahigh frequency radio frequency identification (RFID) reader.
Background technology
Antenna is radiation or receive the parts of radio wave in the engineering systems such as radio communication, radio-frequency (RF) identification, satellite navigation.As transmitting antenna, the guided wave that it sends transmitter here (or high-frequency current) is transformed to radio wave and is sent to the space; And as reception antenna, it does opposite conversion again, thereby has realized the transmission of signal between any 2.Therefore, antenna is the converting means of guided wave and radiated wave.
Microstrip antenna a series of outstanding advantages such as little, in light weight and cost is low with its volume in many antenna systems and be subjected to people's favor, development is swift and violent.In some critical systems, microstrip antenna is given full play to one's remarkable skill.Microstrip antenna has occupied critical role in radio communication, radio-frequency (RF) identification, satellite communication, satellite navigation, commander and various fields such as control system, biomedical radiator.Microstrip antenna is compared with other antenna, has following tangible advantage:
1. volume is little, section is low, in light weight.Like this, even be contained on spaceship, guided missile, rocket or the satellite, can not change its aerodynamic performance yet.
2. be fit to process combination, can make the various devices that have antenna easily.
3. be convenient to obtain circular polarization, realize multifunctional workings such as two-band, dual polarization easily.
4. tissue is a large amount of easily produces.Antenna part feeder line and matching network can once be made, and reduce the error of introducing because of assembling.
In recent years China's mobile communication development is swift and violent, and in mobile radio communication, base station signal can only effectively cover certain geographic range.In place,, weak output signal descends because of causing communication quality away from the base station.In addition, owing to influenced by landform, atural object etc., even in the subway in base station range, tunnel, heavy construction, communication blind district also can appear in underground parking etc., if build the base station again, the cycle is long and investment is big, can adopt the mobile communication trunking for this reason.The repeater is a kind of same frequency trunking that in the wireless communication transmissions process signal is directly amplified, and its basic function is exactly a radiofrequency signal power intensifier.
For fear of the repeated construction of the infrastructure of telecommunication, the Ministry of Industry and Information Technology made an announcement in October, 2008, required various places Communications Administration Bureau and operator to stop repeated construction, advanced the infrastructure of telecommunication to share.The repeater also should advance facility to share as the part of the infrastructure of telecommunication.Therefore develop the wideband repeater of 900MHz communications band and discharging-directly station antenna and its bandwidth and can cover 821-960MHz, having great importance for advancing the repeater to share.
Radio-frequency (RF) identification (RFID, Radio Frequency Identification) technology is a kind of by radiofrequency signal identification specific objective and read and write the wireless communication technology of related data, has been widely used in fields such as animal identification, electronic charging and gate control system.But different countries and regions are the operating frequency of ultrahigh frequency RFID system assignment is different.The working frequency range of China is 840-845MHz and 920-925MHz, and European working frequency range is 865-868MHz, and the North America working frequency range is 902-928MHz, and Japanese working frequency range is 952-955MHz.The 860-960MHz frequency range that frequency range that the distribution of China RFID technology is used and the ISO of International Standards Organization and the IEC of International Electrotechnical Commission recommend is also not quite identical.Along with the develop rapidly of RFID technology, development is applicable to that the wideband reading and writing device antenna in the whole world is that its broadband can cover 835-960MHz, has great importance for promoting the RFID The Application of Technology.Usually ultra-high frequency RFID label adopts linear polarized antenna.Engineering requires read write line can correctly read and write the label that is in any direction in using, so read write line should adopt circular polarized antenna.
Microstrip antenna realizes that the key of circular polarization work is excitation and produces the quadrature linear polarization ripple that two amplitudes equate and phase phasic difference 90 is spent, and the normal method that adopts has single feedback method and many feedbacks method.For single feedback method, only need in the microstrip antenna radiant panel, to introduce asymmetric and select suitable feed placement can realize circular polarization.Single feedback circular polarization microstrip antenna is simple in structure, easily processing and cost are low, but the circular polarization relative bandwidth of such antenna is narrow, is about the 0.5-2% of centre frequency.Adopt low-k and thicker dielectric material (for example, foam or air), the circular polarization relative bandwidth of single feedback single layer microstrip antenna can increase to 10.5%.Adopt stacked arrangement, the circular polarization relative bandwidth of single coaxial feed microstrip antenna can be extended to 13.5%, but input impedance matching is relatively poor, can not satisfy the communication system input vswr less than 1.5 requirement.Adopt L type tape feeding technique and hole coupling feeding technique, stacked microstrip antenna can be realized good impedance matching.But the level of L type tape and vertical component all influence antenna input resistance and input reactance simultaneously, and its design is complicated, and the aerial radiation directional pattern is asymmetric.For hole coupling feeding technique, need an expelling plate to reduce antenna backward radiation (expelling plate and antenna distance are quarter-wave usually), so antenna height is very big.For many feedbacks method, realize circular polarization in addition, make antenna structure complexity, volume increase and the cost raising thereby often adopt the 3dB hybrid ring that two orthogonal points of microstrip antenna are carried out feed.Many feedbacks method also comprises three feedback methods and four feedback methods, and obviously antenna structure is complicated more.
In view of this, a kind of single broadband circle polarized stacked microstrip antenna of feedback of necessary proposition and feeder equipment thereof make that antenna axial ratio is 821-960MHz less than 3dB and standing-wave ratio less than 1.5 bandwidth, and relative bandwidth are 15.6% of a centre frequency.
Summary of the invention
The utility model has been developed a kind of single broadband circle polarized stacked microstrip antenna of feedback and feeder equipment thereof at the proposition of above problem, refers in particular to the broadband circle polarized stacked microstrip antenna that is applied to Mobile communication direct base station or ultrahigh frequency radio frequency identification (RFID) reader.The technical solution adopted in the utility model is as follows:
The coaxial probe feeding technique is that to propose also be a kind of microstrip antenna feeding technique that is most widely used the earliest, its key property is the input resistance that the feed placement of coaxial probe excitation radiation plate has determined antenna, be feed placement near more input resistance is big more from the radiant panel edge, near more input resistance is more little from the radiant panel center.But the inductive effect of coaxial probe makes the beamwidth of antenna very narrow.In order to address this problem, L type probe feed technology is suggested, and is developed into L type tape feeding technique.L type probe and L type tape feeding technique principle are similar, and its principle is that the horizontal component of L type tape and radiant panel closely are coupled and form a coupling capacitance, and this electric capacity can compensate the input inductance that L type tape vertical component is introduced, thereby realizes the wideband coupling.But the level of L type tape and vertical component all influence antenna input resistance and input reactance simultaneously, and its design is complicated, and the aerial radiation directional pattern is asymmetric.Based on coaxial probe feeding technique and L type tape feeding technique, we propose a kind of novel microstrip antenna feeding technique.This feeder equipment comprises: impedance matching plate, feed probes and input connector.One end of impedance matching plate is by lower floor's radiant panel of feed probes excitation stacked microstrip antenna, and the other end connects the input connector inner wire.The impedance matching plate is made up of two circular ring type metal straps, and its shape is " 8 " font.The principle of this feeding technique is: by the determining positions input resistance of feed probes excitation stacked microstrip antenna lower floor radiant panel; Two distributed capacitance by impedance matching plate and stacked microstrip antenna lower floor radiant panel and floor formation compensate the input inductance of being introduced by feed probes, thereby realize good impedance matching.
In order to realize circular polarization radiation and reception, the radiant panel of stacked microstrip antenna all adopts the square plate of diagonal corner cut.For the circular polarization bandwidth of broadening antenna, in the stacked microstrip antenna structure, be provided with two-layer air layer gap.The air layer gap is thick more, and the getable circular polarization bandwidth of institute is wide more.But the air layer gap is thick more, and feed probes is long more, and the input inductance that feed probes is introduced also can be big more, and this will make antenna standing wave ratio of input voltage degradation.Therefore, the thickness in air layer gap should determine according to the beamwidth of antenna.After the decision of air layer gap thickness, corresponding feed probes length has also just determined.Because the bandwidth of antenna that the utility model is developed is 139MHz, relative bandwidth is 15.6% of a centre frequency, and the air layer gross thickness should be greater than 0.14 λ
0If, adopting coaxial probe direct feed lamination plate aerial this moment, antenna will be difficult to realize that standing-wave ratio is less than 1.5 requirement; If adopt L type tape to carry out feed, the aerial radiation directional pattern will be asymmetric.If but the feeder equipment that adopts us to propose carries out feed, the aerial radiation directional pattern will be symmetrical.This is that by its active antenna radiant panel, the Electric Field Distribution of radiant panel will be symmetrical because the impedance matching plate is a symmetrical structure, thereby the directional pattern of realizing in the far field also will be symmetrical.
The real technical indicator that adopts is as follows:
Frequency range: 821-960MHz
Bandwidth: 139MHz
Standing-wave ratio: 1.3: 1
Axial ratio :≤3dB
Polarization mode: RHCP
Antenna gain: 〉=8.8dBi
Half-power beam width: 66 °
Feeding classification: SMA-F.
The technological means that the utility model adopts is as follows:
The feeder equipment of the broadband circle polarized stacked microstrip antenna of a kind of single feedback is characterized in that comprising: impedance matching plate, feed probes and input connector; Described impedance matching plate is made up of two circular ring type metal straps, and is symmetrical structure; One end of described impedance matching plate connects described feed probes, and the other end connects the inner wire of input connector.
The shape of forming two circular ring type metal straps compositions of impedance matching plate is " 8 " font.
A kind of broadband circle polarized stacked microstrip antenna of single feedback that comprises above-mentioned feeder equipment is characterized in that comprising: upper strata radiant panel, lower floor's radiant panel, feeder equipment, floor and fixed screw; Described upper strata radiant panel, lower floor's radiant panel, impedance matching plate and floor are fixed by fixed screw successively; Axle sleeve by being provided with at the fixed screw place between described upper strata radiant panel, lower floor's radiant panel, impedance matching plate and floor is to keep the air layer gap between upper strata radiant panel, lower floor's radiant panel, impedance matching plate and the floor.
Described impedance matching plate forms two distributed capacitance with floor and lower floor's radiant panel respectively.
Described upper strata radiant panel and lower floor's radiant panel are the square plate of diagonal corner cut.
Total crack thickness between described air layer reaches 0.14 λ
0The time by adopting described feeder equipment and stacked microstrip antenna structure, the microstrip antenna axial ratio is expanded less than 1.3 relative bandwidth less than 3dB and voltage standing wave ratio is 15.6% of centre frequency.
The distance at described feed probes and microstrip antenna lower floor radiant panel center has determined the input resistance of antenna, makes input resistance in the broadband circle polarized stacked microstrip antenna working band of described single feedback in 50 ± 8 ohm of scopes by adjusting this distance; The width of the diameter of described feed probes and circular ring type metal strap has determined the input reactance of antenna, make input reactance in the broadband circle polarized stacked microstrip antenna working band of described single feedback in ± 10 ohm of scopes by adjusting probe diameter and strip width, thereby obtain voltage standing wave ratio less than 1.3 wideband matching effect.
Owing to adopted technique scheme, the broadband circle polarized stacked microstrip antenna of single feedback that the utility model provides, the impedance and the circular polarization bandwidth of microstrip antenna have been improved, thereby satisfy the specification requirement of Mobile communication direct base station or any one national ultrahigh frequency RFID system of the whole world, and this antenna has standing wave ratio of input voltage little, gain height and the low characteristics of cost, is suitable for extensively promoting at moving communicating field.
Description of drawings
Fig. 1 is the topology view that the utility model list is presented broadband circle polarized stacked microstrip antenna feeder equipment;
Fig. 2 is the topology view that the utility model list is presented broadband circle polarized stacked microstrip antenna;
Fig. 3 is the input impedance figure that the utility model list is presented broadband circle polarized stacked microstrip antenna;
Fig. 4 is the standing wave ratio of input voltage figure that the utility model list is presented broadband circle polarized stacked microstrip antenna;
Fig. 5 is the axial ratio figure that the utility model list is presented broadband circle polarized stacked microstrip antenna;
Fig. 6 is the gain diagram that the utility model list is presented broadband circle polarized stacked microstrip antenna;
Fig. 7 is that the utility model list is presented the directional pattern of broadband circle polarized stacked microstrip antenna at centre frequency 890MHz.
Embodiment
As shown in Figure 1, the utility model list feeder equipment 1 of presenting broadband circle polarized stacked microstrip antenna comprises impedance matching plate 11, feed probes 12 and input connector 13.One end of impedance matching plate 11 is by feed probes 12 excitation stacked microstrip antennas, and the other end connects the inner wire 131 of input connector 13.Impedance matching plate 11 is made up of two circular ring type metal straps, and its shape is " 8 " font.Because the impedance matching plate 11 that is adopted is symmetrical structures, can make that the directional pattern of microstrip antenna also is symmetrical.Consult Fig. 2, the utility model comprises feeder equipment 1, upper strata radiant panel 2, lower floor's radiant panel 3, floor 4 and fixed screw 5 based on the broadband circle polarized stacked microstrip antenna of single feedback of feeder equipment 1, wherein impedance matching plate 11, upper strata radiant panel 2, lower floor's radiant panel 3 and floor 4, fix by fixed screw 5, between upper strata radiant panel 2, lower floor's radiant panel 3, impedance matching plate 11 and floor 4, pass through axle sleeve 51 in addition, to keep the air layer gap between upper strata radiant panel, lower floor's radiant panel, impedance matching plate and the floor in the setting of fixed screw place.The air layer gap is big more, and axial ratio is wide more less than the circular polarization bandwidth of 3dB.When air layer gap gross thickness is 0.14 λ
0(λ
0Wavelength for the centre frequency correspondence) relative bandwidth of the broadband circle polarized stacked microstrip antenna of single feedback is expanded and is 15.6% of centre frequency the time.Upper strata radiant panel 2 and lower floor's radiant panel 3 are the square plate of diagonal corner cut, to realize circular polarization radiation and reception.Upper strata radiant panel 2 is by lower floor's radiant panel 3 coupling feeds; Lower floor's radiant panel 3 is by feed probes 12 feeds.Impedance matching plate 11 forms two distributed capacitance 61 and 62 with floor 4 and lower floor's radiant panel 3 respectively, can compensate the input inductance of being introduced by feed probes 12, thereby obtain good matching effect.Consult Fig. 3, in the present embodiment, can make the input resistance in the broadband circle polarized stacked microstrip antenna working band 821-960MHz of described single feedback in 50 ± 8 ohm of scopes, change by the distance of adjusting feed probes 12 and lower floor's radiant panel 3 centers; The diameter by adjusting feed probes 12 and the strip width of impedance matching plate 11 can make the input reactance in the broadband circle polarized stacked microstrip antenna working band 821-960MHz of described single feedback change in ± 10 ohm of scopes, thereby obtain standing wave ratio of input voltage less than 1.3 wideband matching effect (as shown in Figure 4).
See also Fig. 4, it is 742-1000MHz less than 1.3 bandwidth that the utility model list is presented broadband circle polarized stacked microstrip antenna standing wave ratio of input voltage, relative bandwidth is 29.6% of a centre frequency, illustrates that the utility model list presents the feeder equipment of broadband circle polarized stacked microstrip antenna and have the Broadband Matching function.Consult Fig. 5, the axial ratio that the utility model list is presented broadband circle polarized stacked microstrip antenna all less than 3dB, illustrates that the utility model list presents the good and circular polarization bandwidth of circular polarization performance of broadband circle polarized stacked microstrip antenna between working band 821-960MHz.Consult Fig. 6, the gain that the utility model list is presented broadband circle polarized stacked microstrip antenna all greater than 8.8dBi, illustrates that the utility model list presents the antenna gain height of broadband circle polarized stacked microstrip antenna between working band 821-960MHz.Fig. 7 presents the directional pattern of broadband circle polarized stacked microstrip antenna at centre frequency 890MHz for the utility model list, as seen from the figure the directional pattern on two of this antenna primary flat x-z and y-z plane unusual symmetry all.
The utility model list is presented broadband circle polarized stacked microstrip antenna, owing to adopted feeder equipment and the stacked microstrip antenna structure that is proposed, make that the antenna standing wave ratio of input voltage is little, the circular polarization bandwidth, processing is simple, cost is low, is very suitable for the application of Mobile communication direct base station or ultrahigh frequency radio frequency identification (RFID) reader.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection range of the present utility model.
Claims (5)
1. the feeder equipment of the broadband circle polarized stacked microstrip antenna of single feedback is characterized in that comprising: impedance matching plate, feed probes and input connector; Described impedance matching plate is made up of two circular ring type metal straps, and is symmetrical structure; One end of described impedance matching plate connects described feed probes, and the other end connects the inner wire of input connector.
2. the feeder equipment of the broadband circle polarized stacked microstrip antenna of a kind of single feedback according to claim 1 is characterized in that forming the shape that two circular ring type metal straps of impedance matching plate form and is " 8 " font.
3. the broadband circle polarized stacked microstrip antenna of single feedback that comprises the described feeder equipment of claim 1 is characterized in that comprising: upper strata radiant panel, lower floor's radiant panel, feeder equipment, floor and fixed screw; Described upper strata radiant panel, lower floor's radiant panel, impedance matching plate and floor are fixed by fixed screw successively; Axle sleeve by being provided with at the fixed screw place between described upper strata radiant panel, lower floor's radiant panel, impedance matching plate and floor is to keep the air layer gap between upper strata radiant panel, lower floor's radiant panel, impedance matching plate and the floor.
4. the broadband circle polarized stacked microstrip antenna of a kind of single feedback according to claim 3 is characterized in that described impedance matching plate forms two distributed capacitance with floor and lower floor's radiant panel respectively.
5. the broadband circle polarized stacked microstrip antenna of a kind of single feedback according to claim 3 is characterized in that described upper strata radiant panel and lower floor's radiant panel are the square plate of diagonal corner cut.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205802881U CN201853796U (en) | 2010-10-20 | 2010-10-20 | Single-fed broadband circularly polarized laminated microstrip antenna and feed device thereof |
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| CN2010205802881U CN201853796U (en) | 2010-10-20 | 2010-10-20 | Single-fed broadband circularly polarized laminated microstrip antenna and feed device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976757A (en) * | 2010-10-20 | 2011-02-16 | 大连海事大学 | Single-feed broadband circular polarization laminated microstrip antenna and feeder thereof |
| CN108511901A (en) * | 2018-04-09 | 2018-09-07 | 重庆邮电大学 | A kind of easily matched circular polarisation UHF RFID reader antennas of impedance |
-
2010
- 2010-10-20 CN CN2010205802881U patent/CN201853796U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976757A (en) * | 2010-10-20 | 2011-02-16 | 大连海事大学 | Single-feed broadband circular polarization laminated microstrip antenna and feeder thereof |
| CN108511901A (en) * | 2018-04-09 | 2018-09-07 | 重庆邮电大学 | A kind of easily matched circular polarisation UHF RFID reader antennas of impedance |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20111020 |