CN104183913A - Broadband circular polarization RFID handheld reader antenna - Google Patents
Broadband circular polarization RFID handheld reader antenna Download PDFInfo
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- CN104183913A CN104183913A CN201410407283.1A CN201410407283A CN104183913A CN 104183913 A CN104183913 A CN 104183913A CN 201410407283 A CN201410407283 A CN 201410407283A CN 104183913 A CN104183913 A CN 104183913A
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Abstract
The invention discloses a broadband circular polarization RFID handheld reader antenna which comprises an FR4 substrate, an annular antenna body, a high-pass filter, a low-pass filter, a Wilkinson power divider and grounded metal. The annular antenna body is arranged on the peripheral edge of the upper portion of the FR4 substrate. The high-pass filter, the low-pass filter and the Wilkinson power divider are arranged on the inner side of the annular antenna body. One path of the output end of the Wilkinson power divider is connected with the low-pass filter and then connected with the midpoint of one inner wall of the annular antenna body through a first feeder line. The other path of the output end of the Wilkinson power divider is connected with the high-pass filter and then connected with the midpoint of the other adjacent inner wall of the annular antenna body through a second feeder line. The grounded metal is arranged on the lower portion of the FR4 substrate. The broadband circular polarization RFID handheld reader antenna has the advantages that a wide impedance bandwidth and a wide axial ratio bandwidth are obtained, and operating frequency bands of the antenna can cover the operating frequency bands specified in RFID standards in China, the United States and Europe; the antenna has a large circular polarization main lobe width, and the main lobe width degree of a left-hand circular polarization directional diagram of the antenna is 55 degrees.
Description
Technical field
The invention belongs to antenna technology and wireless communication field, relate to a kind of broadband circle polarized RFID handheld reader antenna.
Background technology
Radio-frequency (RF) identification is RFID (Radio Frequency Identification) technology, is a kind of contactless communication technology that can be identified specific objective and be read and write data by radio communication.Adopt in the world ultrahigh frequency RFID frequency range standard widely to comprise Chinese Industrial Standards (CIS) (840-844.5MHz and 920.5-924.5MHz), Unite States Standard (902-928MHz) and European standard (866-869MHz).
RFID reader antenna is as the important component part of rfid system, and its performance will greatly affect the effect and quality of whole rfid system.The principal element that affects RFID reader antenna comprises the size of antenna, working frequency range, impedance, gain and polarization mode.
The working frequency range of most of existing circular polarization ultrahigh frequency RFID reader antennas only can meet a kind of standard in Chinese Industrial Standards (CIS), Unite States Standard and European standard, cannot cover the working frequency range of all standards simultaneously.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of broadband circle polarized RFID handheld reader antenna is provided.
The object of the invention is to be achieved through the following technical solutions: a kind of broadband circle polarized RFID handheld reader antenna, comprises FR4 substrate, loop antenna, high pass filter, low pass filter, Wilkinson power divider and metal ground; Wherein, described FR4 substrate is square, and top peripheral edge is provided with loop antenna; The described loop antenna side of being ring structure, inner side is provided with high pass filter, low pass filter and Wilkinson power divider; After output one tunnel of described Wilkinson power divider connects low pass filter, pass through the midpoint of the first feeder line connecting ring antenna one inwall, the midpoint of second another adjacent inner wall of feeder line connecting ring antenna is passed through after connecting high pass filter in another road of the output of Wilkinson power divider; The input of Wilkinson power divider is by the external radio-frequency front-end of sub-miniature A connector through hole; Be provided with metal ground in the bottom of FR4 substrate.
Further, described Wilkinson power divider comprises and covers copper split ring and Chip-R, and Chip-R bridges at the opening part that covers copper split ring.
Further, described high pass filter comprises the first patch capacitor, the second patch capacitor, the first chip inductor, the first Fu Tong district, the second Fu Tong district, Si Futong district and Wu Futong district; The one end in Si Futong district connects the second feeder line, and the other end connects the one end in Wu Futong district by the first chip inductor, and the other end in Wu Futong district connects Wilkinson power divider; In Si Futong district, be provided with the first patch capacitor, the first patch capacitor connects the first Fu Tong district, by grounding through hole and metal be connected; In Wu Futong district, be provided with the second patch capacitor, the second patch capacitor connects the second Fu Tong district, by grounding through hole and metal be connected.
Further, described low pass filter comprises the 3rd patch capacitor, the 4th patch capacitor, the second chip inductor, San Futong district, Liu Futong district and Qi Futong district; The one end in Qi Futong district connects Wilkinson power divider, and the other end is connected with Liu Futong district by the 3rd patch capacitor, and the other end in Liu Futong district is connected with the first feeder line by the 4th patch capacitor; In Qi Futong district, be provided with the second chip inductor, the second chip inductor connects San Futong district, by grounding through hole and metal be connected.
The invention has the beneficial effects as follows: RFID antenna size of the present invention is only 95mm × 95mm × 1.6mm, can be integrated in hand held readers.Antenna has wide impedance bandwidth, its-10dB impedance bandwidth is 710-1150MHz.Antenna has wide axial ratio bandwidth, and the 3dB axial ratio bandwidth of its maximum gain direction is 800-940MHz, can cover the working frequency range of China, US and European standard.Antenna has large circular polarization main lobe width, and the main lobe width of its left-hand circular polarization directional diagram is 55 °.
Brief description of the drawings
Fig. 1 is the overall structure vertical view of antenna;
Fig. 2 is the overall structure upward view of antenna;
Fig. 3 is the impedance bandwidth resolution chart of antenna;
Fig. 4 is the axial ratio bandwidth resolution chart of antenna maximum gain direction;
Fig. 5 is antenna left-hand circular polarization directional diagram perpendicular to substrate direction in the time being operated in 910MHz.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 1, 2, a kind of broadband circle polarized RFID handheld reader antenna of the present invention, comprises FR4 substrate 5, loop antenna 1, high pass filter, low pass filter, Wilkinson power divider and metal ground 17; Wherein, described FR4 substrate 5 is square, and top peripheral edge is provided with loop antenna 1; Described loop antenna 1 side's of being ring structure, inner side is provided with high pass filter, low pass filter and Wilkinson power divider; After output one tunnel of described Wilkinson power divider connects low pass filter, pass through the midpoint of the first feeder line 2 connecting ring antenna 1 one inwalls, the midpoint of second feeder line 3 connecting ring antenna 1 another adjacent inner wall is passed through after connecting high pass filter in another road of the output of Wilkinson power divider; The input of Wilkinson power divider is by the external radio-frequency front-end of sub-miniature A connector through hole 16; Be provided with metal ground 17 in the bottom of FR4 substrate 5.
Described Wilkinson power divider comprises and covers copper split ring 4 and Chip-R 12, and Chip-R 12 bridges at the opening part that covers copper split ring 4.
Described high pass filter comprises the first patch capacitor 6, the second patch capacitor 7, the first chip inductor 8, the first Fu Tong district 13, the second Fu Tong district 14, Si Futong district 18 and Wu Futong district 19; The one end in Si Futong district 18 connects the second feeder line 3, and the other end connects the one end in Wu Futong district 19 by the first chip inductor 8, and the other end in Wu Futong district 19 connects Wilkinson power divider; In Si Futong district 18, be provided with the first patch capacitor 6, the first patch capacitors 6 and connect the first Fu Tong district 13, be connected with metal ground 17 by grounding through hole; In Wu Futong district 19, be provided with the second patch capacitor 7, the second patch capacitors 7 and connect the second Fu Tong district 14, be connected with metal ground 17 by grounding through hole.
Described low pass filter comprises the 3rd patch capacitor 9, the 4th patch capacitor 10, the second chip inductor 11, San Futong district 15, Liu Futong district 20 and Qi Futong district 21; The one end in Qi Futong district 21 connects Wilkinson power divider, and the other end is connected with Liu Futong district 20 by the 3rd patch capacitor 9, and the other end in Liu Futong district 20 is connected with the first feeder line 2 by the 4th patch capacitor 10; In Qi Futong district 21, be provided with the second chip inductor 11, the second chip inductors 11 and connect San Futong district 15, be connected with metal ground 17 by grounding through hole.
Wherein, FR4 substrate 5 is of a size of 95mm × 95mm × 1.6mm, adopts FR4 material, and dielectric constant is 4.4; It is 1206 100 Ω Chip-Rs that Chip-R 12 adopts model; The first patch capacitor 6 and the second patch capacitor 7 are 1.4pF, and the 3rd patch capacitor 9 and the 4th patch capacitor 10 are 8.5pF; The first chip inductor 8 is 6.2nH, and the second chip inductor 11 is 12nH; It is 0603 surface mount elements that the first patch capacitor 6, the second patch capacitor 7, the 3rd patch capacitor 9, the 4th patch capacitor 10, the first chip inductor 8 and the second chip inductor 11 all adopt model; The width of the first feeder line 2 and the second feeder line 3 is that 3mm, length are identical; The internal diameter that covers copper split ring 4 is that 13.7mm, external diameter are 15.3mm; The material on metal ground 17 is copper, and the length of side is 64mm; The outer length of side of loop antenna 1 is that 95mm, the interior length of side are 76mm.
As shown in Figure 3, measured impedance is all mated well with 50 Ω impedance transmission lines at 710-1150MHz in the test input impedance of this antenna.In the axial ratio bandwidth test result of maximum gain direction as shown in Figure 4, in the time of 800-940MHz, axial ratio is all less than 3dB to antenna.At 910MHz perpendicular to the left-hand circular polarization directional diagram of substrate as shown in Figure 5, maximum gain can reach 1.3dBic to antenna, and 3dB powerbeam width can reach 55 °.
The course of work of the present invention is as follows: radiofrequency signal is fed to Wilkinson power divider via sub-miniature A connector through hole 16, after Wilkinson power divider mean allocation power, one tunnel is fed to loop antenna 1 via high pass filter and the second feeder line 3, another road is fed to loop antenna 1 via low pass filter and the first feeder line 2, two paths of signals produces the phase shift of 90 °, broadband, thereby loop antenna 1 is inspired to the circularly polarized signal that is operated in 800-940MHz, for broadband circle polarized RFID handheld reader.
The advantage of RFID reader antenna of the present invention comprises:
(1) cost is low and size is relatively little.Antenna only adopts FR4, two kinds of antennas of copper to process most basic material and conventional surface mount elements.And whole antenna size only has 95mm × 95mm × 1.6mm, size is less compared with other circular polarized antennas.
(2) working frequency range can meet Chinese Industrial Standards (CIS), Unite States Standard and the European standard of ultra-high frequency band RFID simultaneously.
(3) work of 800-940MHz frequency range is good.The axial ratio bandwidth of be all less than-10dB of reflection coefficient, maximum gain direction is all less than 3dB, can reach 1.3dBic in the gain of 910MHz.
(4) main lobe width of circular polarization directional diagram is wide, and in the time that operating frequency is 910MHz, left hand circular polarization 3dB powerbeam width can reach 55 °.
Above-described embodiment is available to those of ordinary skill in the art and realizes or use of the present invention; those of ordinary skill in the art can be without departing from the present invention in the case of the inventive idea; above-described embodiment is made to various modifications or variation; thereby protection scope of the present invention do not limit by above-described embodiment, and it should be the maximum magnitude that meets the inventive features that claims mention.
Claims (4)
1. a broadband circle polarized RFID handheld reader antenna, is characterized in that, comprises FR4 substrate (5), loop antenna (1), high pass filter, low pass filter, Wilkinson power divider and metal ground (17); Wherein, described FR4 substrate (5) is square, and top peripheral edge is provided with loop antenna (1); Described loop antenna (1) side of being ring structure, inner side is provided with high pass filter, low pass filter and Wilkinson power divider; After output one tunnel of described Wilkinson power divider connects low pass filter, pass through the midpoint of the first feeder line (2) connecting ring antenna (1) one inwall, the midpoint of another adjacent inner wall of the second feeder line (3) connecting ring antenna (1) is passed through after connecting high pass filter in another road of the output of Wilkinson power divider; The input of Wilkinson power divider is by the external radio-frequency front-end of sub-miniature A connector through hole (16); Be provided with metal (17) in the bottom of FR4 substrate (5).
2. a kind of broadband circle polarized RFID handheld reader antenna according to claim 1, it is characterized in that, described Wilkinson power divider comprises and covers copper split ring (4) and Chip-R (12), and Chip-R (12) bridges at the opening part that covers copper split ring (4).
3. a kind of broadband circle polarized RFID handheld reader antenna according to claim 1, it is characterized in that, described high pass filter comprises the first patch capacitor (6), the second patch capacitor (7), the first chip inductor (8), the first Fu Tong district (13), the second Fu Tong district (14), Si Futong district (18) and Wu Futong district (19); The one end in Si Futong district (18) connects the second feeder line (3), and the other end connects the one end in Wu Futong district (19) by the first chip inductor (8), and the other end of Wu Futong district (19) connects Wilkinson power divider; On Si Futong district (18), be provided with the first patch capacitor (6), the first patch capacitor (6) connects the first Fu Tong district (13), by grounding through hole and metal (17) be connected; On Wu Futong district (19), be provided with the second patch capacitor (7), the second patch capacitor (7) connects the second Fu Tong district (14), by grounding through hole and metal (17) be connected.
4. a kind of broadband circle polarized RFID handheld reader antenna according to claim 1, it is characterized in that, described low pass filter comprises the 3rd patch capacitor (9), the 4th patch capacitor (10), the second chip inductor (11), San Futong district (15), Liu Futong district (20) and Qi Futong district (21); The one end in Qi Futong district (21) connects Wilkinson power divider, and the other end is connected with Liu Futong district (20) by the 3rd patch capacitor (9), and the other end of Liu Futong district (20) is connected with the first feeder line (2) by the 4th patch capacitor (10); On Qi Futong district (21), be provided with the second chip inductor (11), the second chip inductor (11) connects San Futong district (15), by grounding through hole and metal (17) be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407283.1A CN104183913B (en) | 2014-08-18 | 2014-08-18 | Broadband circle polarized RFID handheld readers antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407283.1A CN104183913B (en) | 2014-08-18 | 2014-08-18 | Broadband circle polarized RFID handheld readers antenna |
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| CN104183913A true CN104183913A (en) | 2014-12-03 |
| CN104183913B CN104183913B (en) | 2017-10-31 |
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Citations (6)
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| CN101459278A (en) * | 2007-12-14 | 2009-06-17 | 长盛科技股份有限公司 | Circular-polarization antenna |
| CN101752664A (en) * | 2010-01-15 | 2010-06-23 | 华南理工大学 | Annular circular polarization ceramic antenna based on quadrature coupling feed |
| CN102414914A (en) * | 2009-03-03 | 2012-04-11 | 雷斯潘公司 | Balanced metamaterial antenna device |
| CN102769159A (en) * | 2011-05-05 | 2012-11-07 | 汤姆森许可贸易公司 | Band-stop filter |
| CN103595364A (en) * | 2013-10-31 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Accurate distribution parameter microstrip high-pass filter |
| CN204029985U (en) * | 2014-08-18 | 2014-12-17 | 浙江大学 | A kind of broadband circle polarized RFID handheld reader antenna |
-
2014
- 2014-08-18 CN CN201410407283.1A patent/CN104183913B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101459278A (en) * | 2007-12-14 | 2009-06-17 | 长盛科技股份有限公司 | Circular-polarization antenna |
| CN102414914A (en) * | 2009-03-03 | 2012-04-11 | 雷斯潘公司 | Balanced metamaterial antenna device |
| CN101752664A (en) * | 2010-01-15 | 2010-06-23 | 华南理工大学 | Annular circular polarization ceramic antenna based on quadrature coupling feed |
| CN102769159A (en) * | 2011-05-05 | 2012-11-07 | 汤姆森许可贸易公司 | Band-stop filter |
| CN103595364A (en) * | 2013-10-31 | 2014-02-19 | 中国电子科技集团公司第四十一研究所 | Accurate distribution parameter microstrip high-pass filter |
| CN204029985U (en) * | 2014-08-18 | 2014-12-17 | 浙江大学 | A kind of broadband circle polarized RFID handheld reader antenna |
Non-Patent Citations (1)
| Title |
|---|
| XI CHEN等: "《Circularly Polarized Stacked Annular-ring Microstrip Antenna with integrated feeding network or UHF RFID Readers》", 《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》 * |
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| CN104183913B (en) | 2017-10-31 |
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