CN108767469B - Dual-open-circuit parallel resonance near field communication antenna - Google Patents
Dual-open-circuit parallel resonance near field communication antenna Download PDFInfo
- Publication number
- CN108767469B CN108767469B CN201810750098.0A CN201810750098A CN108767469B CN 108767469 B CN108767469 B CN 108767469B CN 201810750098 A CN201810750098 A CN 201810750098A CN 108767469 B CN108767469 B CN 108767469B
- Authority
- CN
- China
- Prior art keywords
- open
- parallel resonance
- circuit parallel
- field communication
- dielectric substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004891 communication Methods 0.000 title claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 17
- 238000010168 coupling process Methods 0.000 abstract description 17
- 238000005859 coupling reaction Methods 0.000 abstract description 17
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a double-open-circuit parallel resonance near-field communication antenna which comprises a dielectric substrate, wherein double-open-circuit parallel resonance branches in mirror symmetry and microstrip feeder lines positioned on the central axis of the double-open-circuit parallel resonance branches are arranged on the upper surface of the dielectric substrate, and a metal bottom plate is arranged on the lower surface of the dielectric substrate. The near field communication antenna has a working frequency band of 5.2GHz, is applicable to 802.11 protocols, and can realize high-speed near field information transmission; the near-field communication antenna can realize stronger coupling at a near distance and reduce far-field gain at the same time, so that interference to adjacent communication equipment is avoided; the near field communication antenna has the advantages of simple structure, ingenious design, easy manufacture and strong practicability and application prospect.
Description
Technical Field
The invention belongs to the technical field of near field communication antennas, and particularly relates to a double-open-circuit parallel resonance near field communication antenna.
Background
Near field communication technologies include Radio Frequency Identification (RFID) technology, NFC technology, and emerging TransferJet technology. The RFID is in UHF frequency band or HF and LF frequency band, the NFC is in HF frequency band of 13.56MHz, and near field coupling is performed by using electromagnetic induction principle, but the transmission rate is slow due to lower frequency band, so that the information transmission requirement of large capacity and high rate is difficult to meet. The TransferJet technology well combines the characteristics of Ultra Wideband (UWB) and Near Field Communication (NFC), with its center frequency at 4.48GHz, and theoretically has a transmission rate of up to 375Mbps, but is difficult to use for secondary industrial development due to the business policy of the TransferJet alliance. One reasonable solution is to modify the existing 802.11 protocol, and complete the point-to-point high-speed information transmission under the conditions of limited space and limited bandwidth. On one hand, the problems of low power consumption and space channel interference suppression are achieved by reducing output power, and on the other hand, the antenna is used as an essential device in a communication system, and research on the ultra-close range communication antenna suitable for the 802.11 protocol has important significance.
Microstrip antenna has been widely used because of its characteristics such as with low costs, simple structure, processing cycle are short, and it mainly comprises three parts: the upper layer microstrip patch radiating element and feeder, the middle layer dielectric substrate and the lower layer floor. The microstrip antenna adopts a PCB printing process, and is easy to integrate with a circuit.
Disclosure of Invention
The invention aims to solve the problems and provide a double-open-circuit parallel resonance near field communication antenna which can complete multi-channel and high-capacity wireless data concurrent high-speed transmission in a limited space.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a two open circuit parallel resonance near field communication antennas, includes the dielectric substrate, dielectric substrate upper surface is equipped with the two open circuit parallel resonance minor matters of left and right sides mirror symmetry and is located the microstrip feeder of two open circuit parallel resonance minor matters axis, dielectric substrate lower surface is the metal bottom plate.
Preferably, the single-side lengths of the double-open-circuit parallel resonance branches are all full wavelengths.
Preferably, the two side half-wavelength parts of the double-open-circuit parallel resonance branch knot are bent by 90 degrees.
Preferably, the thickness of the dielectric substrate is not more than 1 mm, preferably 0.6 mm.
Preferably, the dielectric substrate is an FR4 dielectric substrate with a dielectric constant of 4.4 and a loss of 0.002.
The invention has the innovation points that the microstrip symmetrical resonance structure is used, the far-field gain of the antenna is reduced, the near-field distribution uniformity of the antenna is increased, the strong near-field coupling of the antenna is realized, and the coupling loss is rapidly attenuated along with the increase of the distance. The principle of the invention is as follows: the near field communication antenna can be regarded as a parallel combination of two open resonators which are bilaterally symmetrical, the left arm and the feeder line of the antenna form a first resonator, the right arm and the feeder line of the antenna form a second resonator from the whole perspective, the lengths of the two resonators are about lambda respectively, and the resonance frequencies are the same. Because the antenna branches are bilaterally symmetrical about the X axis, the current distribution on the surface of the antenna is also completely symmetrical, the current on the left arm of the antenna is opposite to the current on the right arm of the antenna, and the current intensity is the same, so that the formed electromagnetic fields cancel each other in the far field, the gain of the antenna in the far field is reduced, and the radiation on the XOZ plane is almost zero, as can be seen from the far field pattern. Further, in the high-frequency band, the current on the microstrip line is usually reversed at the half-wavelength of the antenna branch, so that the radiation of the antenna is weakened, the antenna branch is bent at the half-wavelength, and the Q value is increased. The current becomes co-directional, resulting in a more uniform near field distribution. In order to further reduce the gain of the antenna, the dielectric substrate is made thinner, namely the thickness is not more than 1mm, and the ground on the back of the antenna can induce current with the opposite direction to the current on the front microstrip branch, so that far-field radiation is counteracted.
The beneficial effects of the invention are as follows: the double-open-circuit parallel resonance near-field communication antenna provided by the invention has the working frequency of 5.15-5.35GHz under the 802.11a protocol and the center frequency of 5.25GHz, and can realize high-speed near-field information transmission; the near-field communication antenna can realize stronger coupling at a near distance and reduce far-field gain at the same time, so that interference to adjacent communication equipment is avoided; the near field communication antenna has the advantages of simple structure, ingenious design, easy manufacture and strong practicability and application prospect.
Drawings
Fig. 1 is a schematic structural diagram of a dual-open parallel resonant near field communication antenna according to the present invention;
FIG. 2 shows the distribution of current on the surface of a dual-open parallel resonant near field communication antenna according to the present invention;
FIG. 3 is a simulated pattern of a dual open parallel resonant near field communication antenna of the present invention;
FIG. 4 is a diagram showing the case when the dual-open parallel resonant near field communication antenna of the present invention is placed directly opposite;
FIG. 5 is a graph showing the attenuation of coupling loss S21 with distance when the dual-open parallel resonant near field communication antenna of the present invention is placed directly opposite to each other;
FIG. 6 is a diagram showing the case where the dual-open parallel resonant near field communication antenna of the present invention is placed side by side along the Y axis;
FIG. 7 is a graph showing the attenuation of coupling loss S21 with distance when the dual-open parallel resonant near field communication antenna of the present invention is placed in a Y-axis side-by-side relationship;
FIG. 8 is a diagram showing the case where the dual-open parallel resonant near field communication antenna of the present invention is placed side by side along the X axis;
FIG. 9 is a graph showing the attenuation of coupling loss S21 with distance when the dual-open parallel resonant near field communication antenna of the present invention is placed in a side-by-side relationship along the X axis;
FIG. 10 is a diagram of a dual-open parallel resonant near field communication antenna of the present invention when placed opposite;
FIG. 11 is a graph showing the attenuation of coupling loss S21 with distance when the dual-open parallel resonant near field communication antenna of the present invention is placed back to back;
reference numerals illustrate: 1. double open-circuit parallel resonance branches; 2. microstrip feed line.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific examples:
As shown in fig. 1, the dual-open parallel resonance near field communication antenna comprises a dielectric substrate, a dual-open parallel resonance branch and a microstrip feeder on the upper surface of the dielectric substrate, and a metal bottom plate on the lower surface of the dielectric substrate. The double open-circuit parallel resonance branches are arranged in a left-right mirror symmetry manner. The microstrip feeder is positioned at the central axis of the double-open-circuit parallel resonance branch.
In this embodiment, a dual-open-circuit parallel resonant near-field communication antenna with a working frequency of 5.2GHz is taken as an example, the size of a single section of the microstrip antenna is one wavelength, and the physical length is between a vacuum wavelength λ 0＝c/f0 and a medium wavelengthAnd thus sized as follows: the radiating patch was 29.4mm long and 7.5mm wide. The dielectric substrate is an FR4 dielectric substrate with a dielectric constant of 4.4 and a loss of 0.002. In order to reduce the antenna gain, the thickness of the dielectric substrate is preferably 0.6 mm. The length of one side of the double open-circuit parallel resonance branch knot is full wavelength. In order to increase the Q value, weaken far-field radiation and strengthen coupling strength of near field, the two single-side half-wavelength of the double-open-circuit parallel resonance branch joint are bent by 90 degrees. Further, the second half sections of the two single sides of the double-open-circuit parallel resonance branch knot are sequentially bent inwards twice and outwards once. The impedance of the microstrip feed line is 50Ω.
As shown in fig. 2, the antenna branches are symmetric about the X-axis, so that the current distribution on the antenna surface is also completely symmetric, and the current intensity on the antenna arms is the same and the directions are opposite.
It should be noted that: the thinner the dielectric substrate, the lower the far field gain of the antenna and the stronger the near field strength, but the thinner the dielectric substrate, the lower the mechanical strength, the more preferably the thickness of the dielectric substrate is not more than 1mm, the more preferably the gain is 1.5dbi, further preferably 0.6 mm, because the thickness of the circuit board needs to be considered for integration with a circuit.
In addition, the microstrip feeder is designed to be 50Ω for matching, and is convenient to integrate with a circuit. Any antenna or circuit port impedance is not necessarily only 50Ohm, but can be another value, and currently 50 Ω is a common industry standard. Therefore, other resistance values adopted by the microstrip feeder line also belong to the protection scope of the invention under the guidance of the idea of the invention.
As shown in fig. 3, the simulation pattern shows far-field radiation characteristics of the antenna, the radiation of the antenna on the XOZ plane is greatly weakened, the overall gain of the antenna is low, and the interference to adjacent communication equipment is small.
As shown in fig. 4, the antenna is placed in a position where it is just placed in operation. The antenna gain is lower, far field radiation is smaller, and close-range coupling is stronger, and coupling loss between antennas is sensitive to distance. As shown in fig. 5, the coupling loss of the antenna decays rapidly with increasing distance, while maintaining strong coupling at close distances with less interference to neighboring communication devices.
As shown in fig. 6 to 7, the antennas are disposed in pairs along the Y-axis side, and the coupling loss of the antennas rapidly decays with increasing distance.
As shown in fig. 8 to 9, the antennas are disposed in pairs along the X-axis side, and the coupling loss of the antennas rapidly decays with increasing distance.
As shown in fig. 10 to 11, the antennas are disposed opposite to each other, and the coupling loss of the antennas rapidly decays with increasing distance.
In general, the double-open-circuit parallel resonance near-field communication antenna provided by the invention can complete multi-channel and high-capacity wireless data concurrent high-speed transmission in a limited space, has the advantages of low cost, simple structure and short processing period, and has strong practicability and application prospect.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (1)
1. The utility model provides a two open-circuit parallel resonance near field communication antennas which characterized in that: the dual-open-circuit parallel resonance antenna comprises a medium substrate, wherein the upper surface of the medium substrate is provided with a dual-open-circuit parallel resonance branch knot which is in mirror symmetry left and right, and a microstrip feeder line positioned on the central axis of the dual-open-circuit parallel resonance branch knot, and the lower surface of the medium substrate is a metal bottom plate;
the lengths of the single sides of the double open-circuit parallel resonance branches are all full wavelengths;
The two side half-wavelength parts of the double-open-circuit parallel resonance branch knot are bent by 90 degrees;
The thickness of the dielectric substrate is not more than 1 mm;
the thickness of the dielectric substrate is 0.6 mm;
The dielectric substrate is an FR4 dielectric substrate with a dielectric constant of 4.4 and a loss of 0.002; the second half sections of the two single sides of the double-open-circuit parallel resonance branch joint are sequentially bent inwards twice and outwards once; the impedance of the microstrip feed line is 50Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750098.0A CN108767469B (en) | 2018-07-10 | 2018-07-10 | Dual-open-circuit parallel resonance near field communication antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750098.0A CN108767469B (en) | 2018-07-10 | 2018-07-10 | Dual-open-circuit parallel resonance near field communication antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108767469A CN108767469A (en) | 2018-11-06 |
| CN108767469B true CN108767469B (en) | 2024-05-14 |
Family
ID=63973163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810750098.0A Active CN108767469B (en) | 2018-07-10 | 2018-07-10 | Dual-open-circuit parallel resonance near field communication antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108767469B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080089861A (en) * | 2007-04-02 | 2008-10-08 | 엘지이노텍 주식회사 | Antenna |
| CN101752648A (en) * | 2008-11-28 | 2010-06-23 | 航天信息股份有限公司 | Broadband RFID UHF antenna and label with and manufacture method |
| WO2014103025A1 (en) * | 2012-12-28 | 2014-07-03 | シャープ株式会社 | Wireless ic tag apparatus |
| CN208336508U (en) * | 2018-07-10 | 2019-01-04 | 成都爱为贝思科技有限公司 | A kind of double open circuit parallel resonance short-range communication antennas |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4827260B2 (en) * | 2005-03-18 | 2011-11-30 | 国立大学法人九州大学 | Communication circuit, impedance matching circuit, method for producing impedance matching circuit, and design method for impedance matching circuit |
-
2018
- 2018-07-10 CN CN201810750098.0A patent/CN108767469B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080089861A (en) * | 2007-04-02 | 2008-10-08 | 엘지이노텍 주식회사 | Antenna |
| CN101752648A (en) * | 2008-11-28 | 2010-06-23 | 航天信息股份有限公司 | Broadband RFID UHF antenna and label with and manufacture method |
| WO2014103025A1 (en) * | 2012-12-28 | 2014-07-03 | シャープ株式会社 | Wireless ic tag apparatus |
| CN208336508U (en) * | 2018-07-10 | 2019-01-04 | 成都爱为贝思科技有限公司 | A kind of double open circuit parallel resonance short-range communication antennas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108767469A (en) | 2018-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101752675B (en) | Double-frequency antenna and wireless communication device applying same | |
| CN106785463A (en) | A kind of single trap ultra-wideband monopole antenna | |
| CN104701623A (en) | High-isolation MIMO (Multiple Input Multiple Output) antenna | |
| CN104882674A (en) | High-isolation dual polarization differential double-frequency MIMO (Multiple-Input-Multiple-Output) antenna | |
| CN110768011B (en) | High-gain CPW differential antenna with single-layer broadband filtering function integrated | |
| CN103515700B (en) | A kind of RFID antenna | |
| CN102868017A (en) | Radiation device and array antenna based on same | |
| CN103367881A (en) | High-gain G-shaped dual-frequency monopole antenna with loaded dual-frequency AMC reflection plate | |
| CN104993242A (en) | High-common-mode-rejection high-resistance-band differential ultra-wideband SIR slot antenna | |
| CN104882677A (en) | Difference slit MIMO (Multiple Input Multiple Output) antenna with high common mode rejection ratio | |
| CN103414016A (en) | Diversity antenna for portable wireless communication device | |
| CN101707288B (en) | Folding ultra-broadband tapered slot antenna | |
| CN204741073U (en) | High stop band difference ultra wide band SIR slot antenna of high common mode rejection | |
| CN204651491U (en) | There is the difference gap mimo antenna of high cmrr | |
| CN103094676B (en) | With T-type structure and the ultra-wideband antenna with band-stop response mating minor matters | |
| CN112366446B (en) | Multi-slot coupling simultaneous same-frequency full-duplex antenna applied to UHF frequency band RFID | |
| CN106532270B (en) | Resistor loaded for electromagnetic radiation measuring system minimizes Vivaldi antenna | |
| CN111628282B (en) | Vertical feed's dual-frenquency filtering patch antenna | |
| CN111463562B (en) | Ultra-wideband differential feed PIFA antenna with filtering effect | |
| Lee et al. | Compact metamaterial high isolation MIMO antenna subsystem | |
| CN110829023B (en) | Antenna module and terminal | |
| CN104681969B (en) | Hybrid radiant body antenna structure | |
| CN108767469B (en) | Dual-open-circuit parallel resonance near field communication antenna | |
| CN208336508U (en) | A kind of double open circuit parallel resonance short-range communication antennas | |
| CN111541018A (en) | High-gain steep filtering fusion duplex integrated antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |