CN203288764U - Circularly polarized antenna and RFID reader-writer thereof - Google Patents
Circularly polarized antenna and RFID reader-writer thereof Download PDFInfo
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- CN203288764U CN203288764U CN2012207429955U CN201220742995U CN203288764U CN 203288764 U CN203288764 U CN 203288764U CN 2012207429955 U CN2012207429955 U CN 2012207429955U CN 201220742995 U CN201220742995 U CN 201220742995U CN 203288764 U CN203288764 U CN 203288764U
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Abstract
The utility model relates to a circularly polarized antenna and an RFID reader-writer thereof. The circularly polarized antenna comprises a signal processing module and four antenna oscillators, wherein the signal processing module is used for converting a feed signal into four equivalent-amplitude output signals of which the phase difference is 90 degrees, and respectively outputting the signals; the four antenna oscillators are respectively connected with signal output ends of the signal processing module; and the structures of the four antenna oscillators are identical, the four antenna oscillators are arranged on the same plane of a space, the shapes are configured into a square, and each antenna oscillator is an edge of the square. The utility model further relates to an RFID reader-writer. With the implementation of the circularly polarized antenna and the RFID reader-writer thereof, the reading and writing of label data by using the RFID reader-writer is simple and reliable.
Description
Technical field
The utility model relates to field of radio frequency identification, more particularly, relates to a kind of circular polarized antenna and rfid interrogator thereof.
Background technology
At present, RFID handheld terminal on the market is all linear polarized antenna, is used for receiving and transmitting.In general, the antenna of label is also linear polarized antenna.This configuration makes the occasion of at label, placing arbitrarily or during in the horizontal polarization of distinguishing label or the uncertain applications of perpendicular polarization, the RFID handheld terminal must be first and label carry out the coupling of antenna polarization direction, then just can read and write data; Otherwise just may occur reading and writing less than data or data and send poor situation.That is to say, when the antenna of receiving-transmitting sides all is linear polarization, the situation less than data may occur reading and writing; Need to increase and outer step is improved this situation.Cause the client to reduce the evaluation of read write line reliability, also increased the label read-write and become comparatively loaded down with trivial details and difficult.
The utility model content
The technical problems to be solved in the utility model is, for the above-mentioned needs of prior art, takes additional step, comparatively loaded down with trivial details and difficult defect, and a kind of simple, circular polarized antenna and rfid interrogator thereof reliably are provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of circular polarized antenna, comprise for the signal processing module that electric feed signal is converted to four constant amplitudes and phase phasic difference 90 degree output signals and output respectively be connected four antenna a period of time that are connected with each signal output part of described signal processing module; The structure in described four antenna a period of time is identical, and is arranged on the same plane of space, its setting be shaped as square, each antenna a period of time is a described foursquare limit.
Further, described antenna a period of time is corresponding one by one with the signal output part of described signal processing module.
Further, described antenna array attached bag is drawn together a period of time body and the first branch road and the second branch road that obtain by leave the different groove of length and its end of bending on described a period of time body two ends; Described the first branch road connect described signal processing module, signal output part corresponding to this antenna a period of time.
Further, described the first branch road comprises feed leg and the short circuit branch that is positioned at described groove both sides, and described feed leg connects with signal output part described signal processing module, that this antenna a period of time is corresponding, described short circuit branch ground connection.
Further, described four antenna a period of time are located on same circuit board, the feed leg in described antenna a period of time and short circuit branch all by circuit board be connected signal output part or ground and connect; Described the second branch road is unsettled on described circuit board; Be provided with the Copper Foil that is connected with ground on described circuit board.
Further, also comprise for the insulating support that described four antenna a period of time is fixed on described circuit board.
Further, described insulating support comprises cross bracket and is connected with four end points of described cross bracket and perpendicular to four pillars on plane, described cross bracket place, described pillar one end is fixed on described circuit board, and the other end is by opening in fixing described antenna a period of time of the location hole at each antenna a period of time middle part.
Further, described signal processing module comprises that receiving electric feed signal and it is divided into the first power distributing unit of the anti-phase two-way output signal of constant amplitude, the two paths of signals of described the first power distributing unit output is divided into again constant amplitude and phase difference respectively is that 90 two paths of signals of spending also are fed to the described signal that again separates respectively the second power distributing unit and the 3rd power distributing unit in different antenna a period of time.
Further, described the first power distributing unit comprises the first power divider and the first phase shifter, described the first power divider receives electric feed signal, and it is divided into the two-way output that amplitude equates, one tunnel is transferred to the second power distributing unit, and another road is transferred to the 3rd power distributing unit after spending by the first phase shifter phase shift 180; Described the second power distributing unit comprises the second power divider and the second phase shifter, receive the next signal of described the first power distributing unit transmission and be divided into the two-way output of constant amplitude at the second power divider, one tunnel directly is transferred to the first signal output of described signal processing module, is transferred to the secondary signal output of described signal processing module after another road is spent by the second phase shifter phase shift 90; Described the 3rd power distributing unit comprises the 3rd power divider and the 3rd phase shifter, receive the next signal of described the first power distributing unit transmission and be divided into the two-way output of constant amplitude at the 3rd power divider, one tunnel directly is transferred to the 3rd signal output part of described signal processing module, is transferred to the 4th signal output part of described signal processing module after another road is spent by the 3rd phase shifter phase shift 90.
The utility model also comprises a kind of rfid interrogator, comprises antenna, and described antenna is the described circular polarized antenna of above-mentioned any one.
Implement circular polarized antenna of the present utility model and rfid interrogator thereof, has following beneficial effect: because antenna a period of time of this poliarizing antenna is set to square at the space same plane, be transported to simultaneously electric feed signal constant amplitude and phase phasic difference 90 degree in each antenna a period of time, make it become circular polarized antenna; In addition, it is simple in structure, and volume is little, be convenient to processing; Therefore overcome and needed to take additional step, comparatively loaded down with trivial details and difficult defect in the prior art, become simple, reliable while making rfid interrogator read write tag data.
Description of drawings
Fig. 1 is the structural representation of the utility model circular polarized antenna and rfid interrogator embodiment thereof;
Fig. 2 is antenna array minor structure and the position relationship schematic diagram on circuit board thereof in described embodiment;
Fig. 3 is back of circuit board structural representation in described embodiment;
Fig. 4 is the electrical block diagram of signal processing module in described embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
As shown in Figure 1, in circular polarized antenna of the present utility model and rfid interrogator embodiment thereof, this circular polarized antenna comprise for the signal processing module that electric feed signal is converted to four constant amplitudes and phase phasic difference 90 degree output signals and output respectively be connected four the antenna a period of time (referring to first to the 4th antenna a period of time of Fig. 1) that are connected with each signal output part of above-mentioned signal processing module; The structure in these four antenna a period of time is identical, and is arranged on the same plane in space, its setting be shaped as square, each antenna a period of time is this foursquare limit.Be that to put at grade in above-mentioned four antenna a period of time be a foursquare shape, these antenna a period of time still independently and respectively is connected with each output of above-mentioned signal processing module.
As shown in Figure 1, in the present embodiment, signal processing module comprises an electric feed signal input and four signal output parts, the signal of these outputs converts by electric feed signal, the amplitude of the signal of exporting on these signal output parts (namely each antenna a period of time obtain signal) equates, and its phase phasic difference 90 degree; Antenna a period of time is corresponding one by one with the signal output part of described signal processing module.
See also Fig. 2, in the present embodiment, antenna a period of time 1(is because the structure in antenna a period of time in the present embodiment is identical, for simplicity, only describe an antenna a period of time 1, four antenna array minor structures are all like this in fact in the present embodiment) comprise a period of time body and the first branch road and the second branch road that obtain by leave the different groove of length and its end of bending on a period of time body two ends; As shown in Figure 2, in the present embodiment, antenna a period of time body is a metal material flat, that its shape is roughly length direction, for example, and aluminium or copper or alloy; First branch road in above-mentioned antenna a period of time 1 connects signal processing module, signal output part this antenna a period of time 1 correspondence.Specifically, see also Fig. 2, the first branch road comprises feed leg 11 and the short circuit branch 12 that is positioned at the groove both sides of leaving, and feed leg 11 connects with signal output part signal processing module, that this antenna a period of time 1 is corresponding, and short circuit branch 12 ground connection.Above-mentioned the second branch road is unsettled.
A kind of situation in the present embodiment has been shown in Fig. 2, namely four antenna a period of time are located on same circuit board 3, the feed leg 11 in each antenna a period of time and short circuit branch 12(be in Fig. 2 in Fig. 2, the feed leg that only indicates an antenna a period of time be connected with short circuit branch all by circuit board 3 be connected signal output part or ground and connect; And the second branch road is unsettled on this circuit board 3; Simultaneously, end face (the one side in close antenna a period of time due to this circuit board 3, be that antenna a period of time is at the installed surface on circuit board) on be provided with the Copper Foil (this Copper Foil is earth potential) that is connected with ground, so earthy Copper Foil that has of above-mentioned the second branch road and this circuit board 3 end faces interacts, and sends electromagnetic wave.
In Fig. 2, also show described four antenna a period of time are fixed on insulating support 4 on described circuit board 3.This insulating support 4 comprises cross bracket 41 and is connected with four end points of cross bracket 41 and perpendicular to four pillars 42 on cross bracket 41 planes, place, pillar 42 1 ends are fixed on circuit board 3 and (are provided with corresponding fixing hole on circuit board 3), and the other end is fixed this antenna a period of time by opening at the location hole at each antenna a period of time middle part.That is to say, above-mentioned four pillars 42 have been fixed respectively four antenna a period of time.
Fig. 3 shows the bottom (one deck relative with top layer) of circuit board 3, and distributing point 6 is arranged on the bottom of circuit board 3 with earth point 5.Distributing point 6 has electrical connection with the feed input port of above-mentioned signal processing module, and earth point 5 has electrical connection with the ground (being above-mentioned earth potential Copper Foil) of circuit board 3 top layers.Radio frequency cable is the input port of the radiofrequency signal FD feed processing module of 50 ohm with characteristic impedance by distributing point 6.
See also Fig. 4, Fig. 4 shows the structure of signal processing module in this enforcement.In Fig. 4, signal processing module comprises and receives electric feed signal and it is divided into the first power distributing unit of the anti-phase two-way output signal of constant amplitude, and two paths of signals that respectively will described the first power distributing unit output is divided into constant amplitude (be the two-way output signal with input signal more all decay 3dB) again and phase difference is that 90 two paths of signals of spending also are fed to the described signal that again separates respectively the second power distributing unit and the 3rd power distributing unit in different antenna a period of time.Wherein, the first power distributing unit comprises the first power divider and the first phase shifter, the first power divider receives electric feed signal, and it is divided into the two-way output that amplitude equates (be two-way output signal and input signal more all decay 3dB), one tunnel is transferred to the second power distributing unit, and another road is transferred to the 3rd power distributing unit after spending by the first phase shifter phase shift 180; And the second power distributing unit comprises the second power divider and the second phase shifter, in the second power distributing unit, receive signal that the first power distributing unit transmission comes and be divided into the two-way output (be two-way output signal and input signal more all decay 3dB) of constant amplitude at the second power divider, one tunnel directly is transferred to the first signal output (namely carry and remove first day linear array) of signal processing module, is transferred to the secondary signal output (namely carry and remove second day linear array) of signal processing module after another road is spent by the second phase shifter phase shift 90; The 3rd power distributing unit comprises the 3rd power divider and the 3rd phase shifter, in the 3rd power distributing unit, receive signal that the first power distributing unit transmission comes and be divided into the two-way output (be two-way output signal and input signal more all decay 3dB) of constant amplitude at the 3rd power divider, one tunnel directly is transferred to the 3rd signal output part (namely carry and go third antenna a period of time) of described signal processing module, is transferred to the 4th signal output part (namely carry and went for the 4th antenna a period of time) of signal processing module after another road is spent by the 3rd phase shifter phase shift 90.
Like this, the four road signals that output to antenna a period of time are radiofrequency signals of 90 ° of constant amplitude and phase phasic differences.Signal Zhong，Mei road signal power in four tunnel outputs is 1/4th of FD feed power.Four tunnel radiofrequency signals are transported to antenna a period of time through transmission line, and four antenna a period of time convert radiofrequency signal to the circular polarization electromagenetic wave radiation and go out.
In a word, in the present embodiment, the two ends in four antenna a period of time all have the different groove of length and, with its slotted section bending 90 degree, make its two ends form a pair of branch road vertical with plane, antenna a period of time place.Wherein take pillar 42 and the tie point in antenna a period of time, as separation, divide, slightly long a pair of branch road is divided into feed leg 11 and short circuit branch 12, is welded in respectively distributing point and the earth point of circuit board 3 top layers.Slightly short a pair of branch road is unsettled above circuit board 3, perpendicular to the top layer of circuit board 3.The input impedance in antenna a period of time is 50 ohm, thereby with the ground of circuit board 3 top layers, produce the resonance electric field, forms signal in RFID ultra-high frequency band 860MHz～960MHz scope.
When this antenna reception electromagnetic wave, according to the principle of reciprocity of antenna, four antenna oscillators can receive the signal in 860MHz～960MHz scope.At this moment merit minute phase shift block can be considered as three-dB coupler.During transmitted signal, four output ports of signal processing module become input port, and an one input port becomes output port, and the isolated port of 50 ohm is constant.It is worth mentioning that, this antenna only is converted to radiofrequency signal to specific electromagnetic wave,, through signal processing module, finally by radio frequency cable, is outputed in radio circuit; Synchronization, this antenna can only carry out accept or the function that transmits in a kind of.
The utility model also relates to a kind of rfid interrogator, and it comprises antenna, and this antenna is above-mentioned circular polarized antenna.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. circular polarized antenna, it is characterized in that, comprise for the signal processing module that electric feed signal is converted to four constant amplitudes and phase phasic difference 90 degree output signals and output respectively be connected four antenna a period of time that are connected with each signal output part of described signal processing module; The structure in described four antenna a period of time is identical, and is arranged on the same plane of space, its setting be shaped as square, each antenna a period of time is a described foursquare limit.
2. circular polarized antenna according to claim 1, is characterized in that, described antenna a period of time is corresponding one by one with the signal output part of described signal processing module.
3. circular polarized antenna according to claim 2, is characterized in that, described antenna array attached bag is drawn together a period of time body and the first branch road and the second branch road that obtain by leave the different groove of length and its end of bending on described a period of time body two ends; Described the first branch road connect described signal processing module, signal output part corresponding to this antenna a period of time.
4. circular polarized antenna according to claim 3, it is characterized in that, described the first branch road comprises feed leg and the short circuit branch that is positioned at described groove both sides, and described feed leg connects with signal output part described signal processing module, that this antenna a period of time is corresponding, described short circuit branch ground connection.
5. circular polarized antenna according to claim 4, is characterized in that, described four antenna a period of time are located on same circuit board, the feed leg in described antenna a period of time and short circuit branch all by circuit board be connected signal output part or ground and connect; Described the second branch road is unsettled on described circuit board; Be provided with the Copper Foil that is connected with ground on described circuit board.
6. circular polarized antenna according to claim 5, is characterized in that, also comprises for the insulating support that described four antenna a period of time is fixed on described circuit board.
7. circular polarized antenna according to claim 6, it is characterized in that, described insulating support comprises cross bracket and is connected with four end points of described cross bracket and perpendicular to four pillars on plane, described cross bracket place, described pillar one end is fixed on described circuit board, and the other end is by opening in fixing described antenna a period of time of the location hole at each antenna a period of time middle part.
8. circular polarized antenna according to claim 7, it is characterized in that, described signal processing module comprises that receiving electric feed signal and it is divided into the first power distributing unit of the anti-phase two-way output signal of constant amplitude, the two paths of signals of described the first power distributing unit output is divided into again constant amplitude and phase difference respectively is that 90 two paths of signals of spending also are fed to the described signal that again separates respectively the second power distributing unit and the 3rd power distributing unit in different antenna a period of time.
9. circular polarized antenna according to claim 8, it is characterized in that, described the first power distributing unit comprises the first power divider and the first phase shifter, described the first power divider receives electric feed signal, and it is divided into the two-way output that amplitude equates, one tunnel is transferred to the second power distributing unit, and another road is transferred to the 3rd power distributing unit after spending by the first phase shifter phase shift 180; Described the second power distributing unit comprises the second power divider and the second phase shifter, receive the next signal of described the first power distributing unit transmission and be divided into the two-way output of constant amplitude at the second power divider, one tunnel directly is transferred to the first signal output of described signal processing module, is transferred to the secondary signal output of described signal processing module after another road is spent by the second phase shifter phase shift 90; Described the 3rd power distributing unit comprises the 3rd power divider and the 3rd phase shifter, receive the next signal of described the first power distributing unit transmission and be divided into the two-way output of constant amplitude at the 3rd power divider, one tunnel directly is transferred to the 3rd signal output part of described signal processing module, is transferred to the 4th signal output part of described signal processing module after another road is spent by the 3rd phase shifter phase shift 90.
10. a rfid interrogator, comprise antenna, it is characterized in that, described antenna is the described circular polarized antenna of claim 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207429955U CN203288764U (en) | 2012-12-31 | 2012-12-31 | Circularly polarized antenna and RFID reader-writer thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207429955U CN203288764U (en) | 2012-12-31 | 2012-12-31 | Circularly polarized antenna and RFID reader-writer thereof |
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| Publication Number | Publication Date |
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| CN203288764U true CN203288764U (en) | 2013-11-13 |
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| CN2012207429955U Expired - Lifetime CN203288764U (en) | 2012-12-31 | 2012-12-31 | Circularly polarized antenna and RFID reader-writer thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821431A (en) * | 2015-05-06 | 2015-08-05 | 江苏军一物联网股份有限公司 | Three-dimensional antenna for ultrahigh-frequency RFID |
| CN105914465A (en) * | 2016-04-15 | 2016-08-31 | 上海安费诺永亿通讯电子有限公司 | Circularly-polarized antenna and wireless communication device thereof |
-
2012
- 2012-12-31 CN CN2012207429955U patent/CN203288764U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821431A (en) * | 2015-05-06 | 2015-08-05 | 江苏军一物联网股份有限公司 | Three-dimensional antenna for ultrahigh-frequency RFID |
| CN105914465A (en) * | 2016-04-15 | 2016-08-31 | 上海安费诺永亿通讯电子有限公司 | Circularly-polarized antenna and wireless communication device thereof |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131113 |
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| CX01 | Expiry of patent term |