CN102882006B - A kind of multifrequency antenna - Google Patents
A kind of multifrequency antenna Download PDFInfo
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- CN102882006B CN102882006B CN201210380162.3A CN201210380162A CN102882006B CN 102882006 B CN102882006 B CN 102882006B CN 201210380162 A CN201210380162 A CN 201210380162A CN 102882006 B CN102882006 B CN 102882006B
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Abstract
The invention discloses a kind of multifrequency antenna, comprise lower metal ground plate, medium substrate, radiation patch and feed connection, described medium substrate is arranged on lower metal ground plate, radiation patch is arranged on medium substrate, the feed pin at feed connection center is connected with radiation patch, and the earth terminal of feed connection is connected with lower metal ground plate; Described radiation patch has four arc shaped slits, these four arc shaped slits are circumferentially uniformly distributed same, along two line of symmetries of four arc shaped slits, also have rectangular aperture in the end of each arc shaped slits.The present invention easily processes, easy production, and be easy to install, good impedance matching can be realized, can be applicable to the multiple systems such as GSM/3G/WLAN, can utilize outside the paster of planar slot antenna, two pairs of arc shaped slits and four to protruding gap, change the CURRENT DISTRIBUTION of chip surface, encourage three resonance points, realize three frequency operating characteristic.
Description
Technical Field
The invention relates to the technical field of multi-frequency communication, in particular to a multi-frequency antenna.
Background
With the introduction of various wireless communication standards, such as GSM to 3G, WLAN, multi-frequency transmission and reception systems capable of operating in multiple frequency bands simultaneously have been developed, and the integration of communication systems has been greatly improved. The multi-frequency antenna has been widely researched and applied as an indispensable key device in a multi-frequency transceiver, and the multi-frequency antenna can be applied to a communication system for transmitting/receiving radio signals of multiple frequency bands, and has the advantages of compactness, simplicity in implementation and low cost compared with the use of multiple single-frequency antennas.
Most of the existing multi-frequency communication antennas adopt a multi-layer structure and a three-dimensional structure, and the antennas require a complex manufacturing process and occupy relatively large space, so that the antennas are not beneficial to small-scale production and installation. Chinese patent publication No. CN102598411A discloses a multi-frequency antenna, which includes: a substrate, an antenna element, a parallel inductor conductor, a series capacitor conductor, a series inductor conductor, a connection point and an input/output terminal. Wherein the antenna element is disposed on the substrate and electrically connected to the connection point via the shunt inductor conductor. The antenna elements form capacitors together with the portions facing the series capacitor conductors and are electrically connected to the input/output terminals via these capacitors and the series inductor conductors. The antenna has the following disadvantages: the manufacturing process is relatively complex and is not conducive to small-scale production and installation.
Therefore, it is a topic of great research significance and practical application value to provide a multi-frequency antenna which is easy to process, produce and install.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provide a multi-frequency antenna which is easy to process, produce and install, can realize better impedance matching and can be applied to various systems such as GSM/3G/WLAN and the like.
The purpose of the invention is realized by the following technical scheme: a multi-frequency antenna comprises a lower metal ground plate, a dielectric substrate, a radiation patch and a feed connector, wherein the dielectric substrate is arranged on the lower metal ground plate, the radiation patch is arranged on the dielectric substrate, a feed needle at the center of the feed connector is connected with the radiation patch, and the grounding end of the feed connector is connected with the lower metal ground plate; the radiation patch is provided with four arc-shaped gaps which are uniformly distributed on the same circumference, and the end part of each arc-shaped gap is also provided with a rectangular gap along two symmetrical lines of the four arc-shaped gaps. The outer side of the radiation patch is equivalent to a microstrip antenna which mainly determines the first point resonant frequency and has a fine tuning effect on the second resonant frequency and the third resonant frequency. The two pairs of arc-shaped gaps and the four pairs of rectangular gaps influence the current distribution on the surface of the radiation patch, mainly determine the second resonant frequency and the third resonant frequency, and have a fine tuning effect on the first point resonant frequency. The multi-frequency function is realized through the structure.
Preferably, the radiation patch is square, and the side length reference value L is calculated by the following formula:
wherein f isrTo the first resonant frequency that the antenna is expected to reach,reffin order to have an effective dielectric constant, a dielectric constant,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,
reffthe following formula is used to obtain:
wherein,rthe dielectric constant of the dielectric substrate, h is the thickness of the dielectric substrate, W and Delta L are intermediate variables in calculation, and the calculation formula is as follows:
Δ L is calculated by the following formula:
in the formula (1), when the non-uniform linearity of the dielectric substrate is much smaller than the wavelength of the incident light, the dielectric substrate is considered to be a uniform isotropic dielectric, and the dielectric constant can be a certain effective valuereffCharacterized by an effective dielectric constant. W is the width of the rectangular microstrip antenna and has no influence on the resonant frequency. After the side length reference value L is obtained, the subsequent fine adjustment can be carried out on the basis according to the antenna frequency required by design.
Preferably, the reference radius length R of the arc-shaped slot formed on the surface of the radiation patch is calculated by the following formula:
wherein f isr2For the second resonant frequency that the antenna is expected to reach,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,ris the dielectric constant, k, of the dielectric substrate0Is the wave number in vacuum, and h is the thickness of the dielectric substrate. After the radius reference length R is obtained, the subsequent fine adjustment can be carried out on the basis according to the antenna frequency required by design.
When the device is actually used, the radius of the arc-shaped gap is further adjusted on the basis of the obtained radius reference length, and the adjustment is based on the following rule: as the radius increases, the second and third resonant frequencies decrease.
Preferably, the dielectric substrate has a dielectric constant of 2.55. Since the dielectric constant affects the bandwidth of the antenna, the higher the dielectric constant, the stronger the field, and the narrower the bandwidth, the lower the dielectric under the antenna, the better, based on the existing materials, the dielectric substrate with a dielectric constant of 2.55 is used.
The performance, length or length of the antenna have an influence on the resonant frequency, bandwidth and the like of the antenna, the most appropriate arc length needs to be selected according to the expected antenna performance, the rectangular slot at the top end has a large influence on the second resonant point and the third resonant point in the adjusting process, the length of the rectangular slot affects the distribution of surface current, and the length and the width of the rectangular slot are tuned with other parameters of the antenna together and are finally determined by considering comprehensive factors.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention is easy to process, easy to produce, easy to install, can realize better impedance matching, and can be applied to various systems such as GSM/3G/WLAN and the like.
2. The invention can utilize the outer side of the patch, two pairs of arc-shaped gaps and four pairs of convex gaps of the planar slot antenna to change the current distribution on the surface of the patch, excite three resonance points and realize the three-frequency working characteristic.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the antenna shown in FIG. 1;
FIG. 3 is a plot of the return loss, S11, of the antenna of the present invention;
FIG. 4 is an X-Z planar radiation pattern for an antenna of the present invention operating at 0.83GHz, 1.8GHz and 2.46 GHz;
fig. 5 is a Y-Z plane radiation pattern for the antenna of the present invention operating at 0.83GHz, 1.8GHz, and 2.46 GHz.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, a multi-frequency antenna includes a lower metal ground plate, a dielectric substrate, a radiation patch, and a feed connector, where the dielectric substrate is disposed on the lower metal ground plate, the radiation patch is disposed on the dielectric substrate, a feed pin at the center of the feed connector is connected to the radiation patch, and a ground terminal of the feed connector is connected to the lower metal ground plate; the radiation patch is provided with four arc-shaped gaps which are uniformly distributed on the same circumference, and the end part of each arc-shaped gap is also provided with a rectangular gap along two symmetrical lines of the four arc-shaped gaps.
The radiation patch is square, and the side length reference value L of the radiation patch is calculated by the following formula:
wherein f isrTo the first resonant frequency that the antenna is expected to reach,reffin order to have an effective dielectric constant, a dielectric constant,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,
reffthe following formula is used to obtain:
wherein,rthe dielectric constant of the dielectric substrate, h is the thickness of the dielectric substrate, W and Delta L are intermediate variables in calculation, and the calculation formula is as follows:
Δ L is calculated by the following formula:
the radius reference length R of the arc-shaped gap formed on the surface of the radiation patch is calculated by the following formula:
wherein f isr2For the second resonant frequency that the antenna is expected to reach,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,ris the dielectric constant, k, of the dielectric substrate0Is the wave number in vacuum, and h is the thickness of the dielectric substrate. After the radius reference length R is obtained, the subsequent fine adjustment can be carried out on the basis according to the antenna frequency required by design.
The dielectric substrate selected in this example had a dielectric constant of 2.55.
In practical applications, the performance and size of the antenna are related to the resonant frequency and bandwidth of the antenna, and the size of the antenna needs to be adjusted according to the desired antenna performance. Before adjustment, the influence rule of the antenna on each frequency point needs to be determined. As shown in fig. 1, the value of L becomes larger, and the first and third resonance frequencies decrease accordingly. The value of r2 becomes larger, and the second and third resonance frequencies become lower. The value of d1 becomes larger and the third resonant frequency increases significantly, with a slight increase in the first and second resonant frequencies. The value of d2 becomes larger and the third resonant frequency decreases significantly, with a slight decrease in the first resonant frequency. The value of d3 becomes larger and the second resonance frequency decreases.
By utilizing the above rule, when the antenna is specifically adjusted according to the antenna performance to enable three resonance points of the antenna to respectively reach expected values, the value of L is adjusted firstly by adopting the following steps, and the frequency of the first resonance point is determined. And secondly, adjusting the values of r2, d1 and d2 to determine the frequency of the third resonance point, and simultaneously enabling the second resonance frequency to be close to the designed frequency as much as possible, wherein the adjustment effects on the three frequencies of the antenna are limited due to the limitation of the size of the antenna by adjusting the values of d1, d2 and d 3. Finally d3 is adjusted to determine the frequency of the second resonance point.
After the size of the antenna is obtained, the antenna is processed to manufacture a physical antenna, and the performance of the antenna is measured by some measuring instruments. The antenna in this embodiment has been verified, and the actual measurement result is identical to the design.
Fig. 3 shows a return loss, i.e., an S11 curve, of the antenna, and it can be seen that the antenna described in this embodiment achieves better impedance matching at three frequency points, where the three frequency points are 0.83GHz, 1.8GHz, and 2.46GHz, respectively, and are suitable for GSM, 3G, and WLAN networks.
Fig. 4 and 5 are the X-Z plane radiation patterns and the Y-Z plane radiation patterns of the antenna of this embodiment operating at 0.83GHz, 1.8GHz, and 2.46GHz, respectively, which shows that the antenna of this embodiment has wider radiation patterns at three frequency points and better symmetry of the radiation patterns.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. A multi-frequency antenna is characterized by comprising a lower metal ground plate, a dielectric substrate, a radiation patch and a feed connector, wherein the dielectric substrate is arranged on the lower metal ground plate; the radiation patch is provided with four arc-shaped gaps which are uniformly distributed on the same circumference, and the end part of each arc-shaped gap is also provided with a rectangular gap along two symmetrical lines of the four arc-shaped gaps;
along one of the symmetry lines, a pair of rectangular gaps are respectively arranged at two ends of the symmetry line, and the two pairs of rectangular gaps are asymmetric;
the radiation patch is square, and the side length reference value L of the radiation patch is calculated by the following formula:
wherein f isrTo the first resonant frequency that the antenna is expected to reach,reffin order to have an effective dielectric constant, a dielectric constant,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,
reffthe following formula is used to obtain:
wherein,rthe dielectric constant of the dielectric substrate, h is the thickness of the dielectric substrate, W and Delta L are intermediate variables in calculation, and the calculation formula is as follows:
Δ L is calculated by the following formula:
2. the multi-band antenna of claim 1, wherein the radius reference length R of the arc-shaped slot formed on the surface of the radiating patch is calculated by the following formula:
wherein f isr2For the second resonant frequency that the antenna is expected to reach,0is a dielectric constant in vacuum, mu0In order to achieve a magnetic permeability in a vacuum,ris the dielectric constant, k, of the dielectric substrate0Is the wave number in vacuum, and h is the thickness of the dielectric substrate.
3. The multi-frequency antenna of claim 2, wherein the radius of the arc-shaped slot is further adjusted based on the determined reference length of the radius based on the following rule: as the radius increases, the second and third resonant frequencies decrease.
4. The multi-frequency antenna of claim 1, wherein the dielectric substrate has a dielectric constant of 2.55.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210380162.3A CN102882006B (en) | 2012-10-09 | 2012-10-09 | A kind of multifrequency antenna |
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| CN201210380162.3A CN102882006B (en) | 2012-10-09 | 2012-10-09 | A kind of multifrequency antenna |
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| CN102882006B true CN102882006B (en) | 2015-12-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618138B (en) * | 2013-12-17 | 2015-06-03 | 山西大学 | Miniaturized differential microstrip antenna |
| CN108511880B (en) * | 2017-02-23 | 2020-05-15 | 香港城市大学深圳研究院 | Miniaturized ultrahigh frequency ternary sequence feed antenna |
| CN110828997B (en) * | 2019-11-19 | 2022-03-29 | 榆林学院 | Double-layer dielectric substrate multi-frequency high-gain microstrip slot antenna |
| WO2022203534A1 (en) * | 2021-03-25 | 2022-09-29 | Limited Liability Company "Topcon Positioning Systems" | Compact circularly polarized patch antenna with slot excitation |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771291A (en) * | 1985-08-30 | 1988-09-13 | The United States Of America As Represented By The Secretary Of The Air Force | Dual frequency microstrip antenna |
| KR100734005B1 (en) * | 2006-01-18 | 2007-06-29 | 인천대학교 산학협력단 | Single-feed dual-band circularly polarized single patch antenna |
| CN101355194A (en) * | 2008-09-01 | 2009-01-28 | 北京邮电大学 | Dual range microstrip antenna |
| CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
| CN201797044U (en) * | 2010-04-22 | 2011-04-13 | 山东科技大学 | Single-surface-mounted-chip dual-frequency dual-polarized microstrip antenna |
| CN1973404B (en) * | 2004-06-23 | 2011-06-08 | 胡贝尔和茹纳股份公司 | Broadband patch antenna |
| CN102468534A (en) * | 2010-11-04 | 2012-05-23 | 北京和协航电科技有限公司 | Single-layer double-frequency microstrip antenna |
| US8203498B2 (en) * | 2008-10-19 | 2012-06-19 | Research In Motion Limited | Three-fold polarization diversity antenna |
-
2012
- 2012-10-09 CN CN201210380162.3A patent/CN102882006B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771291A (en) * | 1985-08-30 | 1988-09-13 | The United States Of America As Represented By The Secretary Of The Air Force | Dual frequency microstrip antenna |
| CN1973404B (en) * | 2004-06-23 | 2011-06-08 | 胡贝尔和茹纳股份公司 | Broadband patch antenna |
| KR100734005B1 (en) * | 2006-01-18 | 2007-06-29 | 인천대학교 산학협력단 | Single-feed dual-band circularly polarized single patch antenna |
| CN101355194A (en) * | 2008-09-01 | 2009-01-28 | 北京邮电大学 | Dual range microstrip antenna |
| US8203498B2 (en) * | 2008-10-19 | 2012-06-19 | Research In Motion Limited | Three-fold polarization diversity antenna |
| CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
| CN201797044U (en) * | 2010-04-22 | 2011-04-13 | 山东科技大学 | Single-surface-mounted-chip dual-frequency dual-polarized microstrip antenna |
| CN102468534A (en) * | 2010-11-04 | 2012-05-23 | 北京和协航电科技有限公司 | Single-layer double-frequency microstrip antenna |
Non-Patent Citations (1)
| Title |
|---|
| 新型WLAN双频微带贴片天线的设计;钟期洪等;《中山大学学报（自然科学版）》;20040131;第43卷(第1期);第29-31页 * |
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