CN105305051A - Elliptical circular polarization microstrip antenna - Google Patents
Elliptical circular polarization microstrip antenna Download PDFInfo
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- CN105305051A CN105305051A CN201510724811.0A CN201510724811A CN105305051A CN 105305051 A CN105305051 A CN 105305051A CN 201510724811 A CN201510724811 A CN 201510724811A CN 105305051 A CN105305051 A CN 105305051A
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- circular polarization
- microstrip antenna
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- radiant panel
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Abstract
The invention brings forward an elliptical circular polarization microstrip antenna. The elliptical circular polarization microstrip antenna employs an elliptical microstrip radiation mode, and compared to a conventional rectangular microstrip antenna, improves the bandwidth by more than one time, thereby being particularly suitable for requirement for quite wide bandwidth of a Beidou third-generation BOC modulation mode. The elliptical circular polarization microstrip antenna comprises a metal radiation plate, a medium substrate and a metal reflection base plate, wherein the metal radiation plate and the metal reflection base plate are respectively arranged at the upper surface and the lower surface of the medium substrate; the metal radiation plate is elliptically-shaped for radiating circular polarized waves; and the metal radiation plate is provided with a coaxial feed point for feeding into electromagnetic wave signals.
Description
Technical field
The invention belongs to technical field of satellite navigation, particularly relate to a kind of oval circular polarization microstrip antenna, be applicable to Beidou satellite navigation system, be also applicable to the gps system, the Galileo system in Europe, the various navigational satellite systems of Muscovite GLONASS system that comprise the U.S..
Background technology
Satellite navigation aerial is generally divided into linear polarization and circular polarization two kinds by polarization mode.Linear polarized antenna implementation is simple, is generally used for mobile phone etc. in the not high amateur navigator of positioning accuracy request.Generally circular polarized antenna is adopted in the professional navigator such as satellite navigation receiver.At present, GPS System in USA, Russian GLONASS system, the dipper system of China all adopts the form of circularly polarised wave to launch an artificial satellite signal.Circularly polarised wave has multiple advantage, such as, can be realized the isolation of receiving and transmitting signal by left-right-hand circular polarization, facilitate shipping vehicle to receive in case of motion, also facilitates navigation satellite and neighbouring same track non-navigational satellite to realize polarization-compatible.Current Beidou II uses the modulation system of binary phase modulation (BPSK), and Big Dipper three generations uses the modulation system of binary offset carrier (BOC).Two kinds of modulation signals of Beidou II and Big Dipper three generations, avoid mutual interference by the mode of frequency division multiplexing, take full advantage of the frequency spectrum resource of different frequency range.But, Big Dipper three generations BOC modulation signal bandwidth (such as B3 frequency bandwidth 40.96MHz), wider one times than Beidou II BPSK modulation signal bandwidth (such as B3 frequency bandwidth 20.48MHz), therefore new requirement is proposed to the bandwidth of operation of reception antenna.
Summary of the invention
The present invention is directed to the deficiency that current rectangular microstrip antenna bandwidth is narrower, a kind of oval circular polarization microstrip antenna is proposed, be particularly useful for Big Dipper three generations satellite navigation system, adopt oval shaped microstrip radiation mode, compare with ordinary rectangular microstrip antenna, bandwidth is enhanced about more than once, and meets Big Dipper three generations BOC modulation system completely to the requirement of the beamwidth of antenna.
Technical scheme of the present invention is:
1. an oval circular polarization microstrip antenna, is characterized in that, comprises metal radiant panel, medium substrate and metallic reflection base plate, described metal radiant panel and metallic reflection base plate be arranged at respectively medium substrate above and below; The shape of described metal radiant panel is oval, for giving off circularly polarised wave, metal radiant panel arranges coaxial feed point, for feed-in electromagnetic wave signal.
2. described in, metallic reflection base plate is arranged at the lower surface of medium substrate, or the lower surface of distance medium substrate has certain distance.
3. metal radiant panel described in is arranged at the upper surface of medium substrate.
4. described in, the length of the minor axis of oval metal radiant panel is about
the difference of major axis and minor axis
between; Wherein, 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate.
5. distributing point described in is arranged on the major axis of oval metal radiant panel and the angular bisector of minor axis.
6. distributing point described in exists to metal radiant panel centre distance
basis on finely tune, fine setting scope is generally no more than 20%; 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate.
7. medium substrate described in selects high dielectric constant material, to reduce the size of described microstrip antenna radiant panel.
8. the scope of dielectric substrate thickness described in is selected between 0.01 λ ~ 0.15 λ, to improve radiation efficiency and the bandwidth of operation of antenna.
9. air described in, between microstrip antenna metal radiant panel and metallic reflection base plate, also can be used to serve as medium substrate.
Technique effect of the present invention:
The oval circular polarization microstrip antenna of the one that the present invention proposes, is particularly useful for Big Dipper three generations satellite navigation system, has following characteristics:
1. the metal radiant panel of microstrip antenna of the present invention adopts oval, and the length of minor axis is about
the difference of major axis and minor axis is
between; Wherein, 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate; Compare with ordinary rectangular microstrip antenna, there is size little, with wide feature; The relative bandwidth (i.e. the beamwidth of antenna/center of antenna frequency) of oval microstrip antenna of the present invention is 8%; And rectangular microstrip antenna relative bandwidth is only 3.5%, ordinary rectangular microstrip antenna is compared, bandwidth is more than doubled, for B3 frequency, oval microstrip antenna center frequency point of the present invention is 1268.52MHz, and relative bandwidth is 8%, i.e. 101MHz, meet Big Dipper three generations BOC modulation system completely and wider requirement is required to the beamwidth of antenna, be particularly suitable for Big Dipper three generations satellite navigation system.
2. circular polarization microstrip antenna of the present invention is right-handed circular polarization antenna, or left-hand circular polarization antenna, is to be determined by oval major axis, relative position between minor axis and distributing point.When the distributing point of circular polarization microstrip antenna of the present invention is on the miter angle bisector of X-axis and Y-axis, antenna axial ratio is best.X-axis is transverse, and Y-axis is in ellipse short shaft situation; Distributing point is 1, and on the miter angle bisector of 3 quadrant X-axis and Y-axis, antenna is left-hand circular polarization antenna; Distributing point is 2, and on the miter angle bisector of 4 quadrant X-axis and Y-axis, antenna is right-handed circular polarization antenna.Y-axis is transverse, and X-axis is in ellipse short shaft situation; Distributing point is 1, and on the miter angle bisector of 3 quadrant X-axis and Y-axis, antenna is right-handed circular polarization antenna; Distributing point is 2, and on the miter angle bisector of 4 quadrant X-axis and Y-axis, antenna is left-hand circular polarization antenna.Circular polarization microstrip antenna relative bandwidth of the present invention is 8%, and normal axis ratio is 2, has outstanding rejection ability to the multipath reflection ripple in environment for use.(the multipath reflection ripple of right-handed circular polarization signal is left-hand circular polarization ripple, and desirable right-handed circular polarization antenna can not accept left-handed polarized wave).
Accompanying drawing explanation
Fig. 1 is circular polarization microstrip antenna structural representation of the present invention.
Fig. 2 is the standing wave pattern of circular polarization microstrip antenna of the present invention.
Fig. 3 is the directional diagram of circular polarization microstrip antenna of the present invention.
Reference numeral lists as follows: 1-metallic reflection base plate, 2-distributing point, 3-medium substrate, 4-metal radiant panel.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
As shown in Figure 1, be circular polarization microstrip antenna structural representation of the present invention.Be applicable to an oval circular polarization microstrip antenna for Big Dipper three generations satellite navigation system, comprise metal radiant panel 4, medium substrate 3 and metallic reflection base plate 1; Metal radiant panel 4 and metallic reflection base plate 1 be arranged at respectively medium substrate 3 above and below; The shape of metal radiant panel 4 is oval, for giving off circularly polarised wave; Metal radiant panel 4 arranges coaxial feed point 2, for feed-in electromagnetic wave signal.The medium substrate 3 of the present embodiment and metallic reflection base plate 1 are circular, and metallic reflection base plate 1 is arranged at the lower surface of medium substrate 3, also can have certain distance apart from the lower surface of medium substrate 3; Metal radiant panel 4 is arranged at the upper surface of medium substrate 3; Metal radiant panel 4 and medium substrate 3 can in the corner of metallic reflection base plate 1, center or Anywhere, in the present embodiment, metal radiant panel 4 and medium substrate 3 are positioned at the center of metallic reflection base plate 1.The length of the minor axis of the oval metal radiant panel 4 of the present embodiment is about
the difference of major axis and minor axis is
between; Wherein, 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate.
The mode that oval circular polarization microstrip antenna of the present invention realizes circular polarization is, by the distributing point on the miter angle bisector of X-axis and Y-axis, electric field component is divided into X-axis component and Y-axis component.Can any position on metal radiant panel on the situation theory of distributing point, if when distributing point is not on the miter angle bisector of X-axis and Y-axis, electric field component can not be halved, so antenna axial ratio is deteriorated.When distributing point is on the miter angle bisector of X-axis and Y-axis, antenna axial ratio is best.Distributing point to elliptical center apart from constant, to X-axis or Y-axis close, antenna axial ratio be deteriorated.When distributing point is in X-axis or Y-axis, antenna axial ratio approach infinity, antenna becomes linear polarized antenna.Distributing point from miter angle bisector to X-axis or Y-axis close, be that antenna changes the process of linear polarized antenna into gradually from circular polarized antenna.
Oval microstrip antenna is right-handed circular polarization antenna, or left-hand circular polarization antenna, is to be determined by oval major axis, relative position between minor axis and distributing point.X-axis is transverse, and Y-axis is in ellipse short shaft situation, and distributing point is 1, and on the miter angle bisector of 3 quadrant X-axis and Y-axis, antenna is left-hand circular polarization antenna; Distributing point is 2, and on the miter angle bisector of 4 quadrant X-axis and Y-axis, antenna is right-handed circular polarization antenna.Y-axis is transverse, and X-axis is in ellipse short shaft situation, and distributing point is 1, and on the miter angle bisector of 3 quadrant X-axis and Y-axis, antenna is right-handed circular polarization antenna; Distributing point is 2, and on the miter angle bisector of 4 quadrant X-axis and Y-axis, antenna is left-hand circular polarization antenna.
Along with the position of distributing point is moved to edge along the angular bisector of oval major and minor axis from metal radiant panel center, antenna impedance becomes large gradually.Distributing point is when metal radiant panel center, and antenna impedance levels off to zero ohm, and distributing point is when metal radiant panel edge, and impedance levels off to 300 ohm.When distributing point is suitable to metal radiant panel centre distance, antenna impedance moves to 50 ohm, to realize the impedance matching with other electronic devices.When impedance is mated completely, signal transmission loss is minimum.General distributing point exists to metal radiant panel centre distance
basis on finely tune, fine setting scope is generally no more than 20%.
When coaxial feed point 2 in the present embodiment is specifically implemented, SMA-KFD series coaxial connector can be used, sub-miniature A connector is fixed on above metallic reflection base plate 1, and by the signal core of SMA-KFD coaxial connector, welds together through medium substrate 3 and metal radiant panel 4.The present invention can use multiple coaxial connector, just illustrates concrete mounting means by SMA-KFD series here, is not limited to SMA-KFD series.
In addition, can also by the size selecting the medium substrate 3 of differing dielectric constant to adjust metal radiant panel 4, medium substrate 3 can select high dielectric constant material, to reduce the size of described microstrip antenna radiant panel.And the thickness of medium substrate 4 also affects radiation efficiency and the bandwidth of operation of antenna, the present embodiment dielectric substrate thickness scope is selected between 0.01 λ ~ 0.15 λ, to improve radiation efficiency and the bandwidth of operation of antenna.Also air can be used between microstrip antenna metal radiant panel and metallic reflection base plate to serve as dielectric-slab, do not use medium substrate.
Fig. 2 is the standing wave pattern of circular polarization microstrip antenna of the present invention.Ordinate represents standing-wave ratio, and abscissa is frequency, and function curve represents the standing-wave ratio of antenna on each Frequency point.Standing-wave ratio ideal value equals 1, and represent that the impedance of feeder line and antenna is mated completely, now high-frequency energy is all gone out by aerial radiation, does not have the reflection loss of energy; When standing-wave ratio is infinitely great, represent total reflection, energy does not radiate completely.
Accompanying drawing 3 is the directional diagram of circular polarization microstrip antenna of the present invention.Antenna pattern refers to from antenna a distance, the figure that the relative field strength (normalization modulus value) of radiation field changes with direction, radial coordinate (-35 ~ 15) represents antenna gain, represent with dB, angle coordinate represents aerial radiation or receives electromagnetic angle, function curve represents day alignment all directions radiation or receives the power of electromagnetic wave ability, represents with dB.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore, although this specification and embodiment have been described in detail to the invention, it will be appreciated by those skilled in the art that and still can modify to the invention or equivalent replacement; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, it is all encompassed in the middle of the protection range of the invention patent.
Claims (9)
1. an oval circular polarization microstrip antenna, is characterized in that, comprises metal radiant panel, medium substrate and metallic reflection base plate, described metal radiant panel and metallic reflection base plate be arranged at respectively medium substrate above and below; The shape of described metal radiant panel is oval, for giving off circularly polarised wave, metal radiant panel arranges coaxial feed point, for feed-in electromagnetic wave signal.
2. oval circular polarization microstrip antenna according to claim 1, is characterized in that, described metallic reflection base plate is arranged at the lower surface of medium substrate, or the lower surface of distance medium substrate has certain distance.
3. oval circular polarization microstrip antenna according to claim 1 and 2, is characterized in that, described metal radiant panel is arranged at the upper surface of medium substrate.
4. oval circular polarization microstrip antenna according to claim 1, is characterized in that, the length of the minor axis of described oval metal radiant panel is about
the difference of major axis and minor axis is
between; Wherein, 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate.
5. oval circular polarization microstrip antenna according to claim 4, is characterized in that, described distributing point is arranged on the major axis of oval metal radiant panel and the angular bisector of minor axis.
6. oval circular polarization microstrip antenna according to claim 5, is characterized in that, described distributing point exists to metal radiant panel centre distance
basis on finely tune, fine setting scope is generally no more than 20%; 1 λ is an Antenna Operation center frequency point wavelength in free space, and ε is the dielectric constant of medium substrate.
7. oval circular polarization microstrip antenna according to claim 6, is characterized in that, described dielectric substrate thickness scope is selected between 0.01 λ ~ 0.15 λ, to improve radiation efficiency and the bandwidth of operation of antenna.
8. oval circular polarization microstrip antenna according to claim 1, is characterized in that, described medium substrate selects high dielectric constant material, to reduce the size of described microstrip antenna radiant panel.
9. oval circular polarization microstrip antenna according to claim 1, is characterized in that, air also can be used between described microstrip antenna metal radiant panel and metallic reflection base plate to serve as medium substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510724811.0A CN105305051A (en) | 2015-10-29 | 2015-10-29 | Elliptical circular polarization microstrip antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510724811.0A CN105305051A (en) | 2015-10-29 | 2015-10-29 | Elliptical circular polarization microstrip antenna |
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| CN105305051A true CN105305051A (en) | 2016-02-03 |
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| CN201510724811.0A Pending CN105305051A (en) | 2015-10-29 | 2015-10-29 | Elliptical circular polarization microstrip antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384884A (en) * | 2016-10-27 | 2017-02-08 | 北京东方联星科技有限公司 | Hollow polygonal double-frequency single-layer micro-strip antenna |
| CN106450732A (en) * | 2016-10-27 | 2017-02-22 | 北京东方联星科技有限公司 | Hollow circular double-band single-layer microstrip antenna |
| WO2023240792A1 (en) * | 2022-06-14 | 2023-12-21 | 上海海积信息科技股份有限公司 | Satellite navigation antenna and satellite navigation transceiving device |
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| US20090213010A1 (en) * | 2008-02-27 | 2009-08-27 | Chih-Shen Chou | Polarized antenna with reduced size |
| CN102354809A (en) * | 2011-08-09 | 2012-02-15 | 华南理工大学 | Double-frequency and double-polarization antenna capable of operating in compass satellite navigation system and mobile third-generation (3G) network |
| CN202221815U (en) * | 2011-09-09 | 2012-05-16 | 中国航天科工集团第三研究院第八三五七研究所 | Small-sized multi-unit anti-interference Beidou satellite navigation system antenna array |
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2015
- 2015-10-29 CN CN201510724811.0A patent/CN105305051A/en active Pending
Patent Citations (3)
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| US20090213010A1 (en) * | 2008-02-27 | 2009-08-27 | Chih-Shen Chou | Polarized antenna with reduced size |
| CN102354809A (en) * | 2011-08-09 | 2012-02-15 | 华南理工大学 | Double-frequency and double-polarization antenna capable of operating in compass satellite navigation system and mobile third-generation (3G) network |
| CN202221815U (en) * | 2011-09-09 | 2012-05-16 | 中国航天科工集团第三研究院第八三五七研究所 | Small-sized multi-unit anti-interference Beidou satellite navigation system antenna array |
Non-Patent Citations (1)
| Title |
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| 刘永鑫等: ""右旋圆极化微带天线的设计与实现"", 《第三届中国卫星导航学术年会》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106384884A (en) * | 2016-10-27 | 2017-02-08 | 北京东方联星科技有限公司 | Hollow polygonal double-frequency single-layer micro-strip antenna |
| CN106450732A (en) * | 2016-10-27 | 2017-02-22 | 北京东方联星科技有限公司 | Hollow circular double-band single-layer microstrip antenna |
| WO2023240792A1 (en) * | 2022-06-14 | 2023-12-21 | 上海海积信息科技股份有限公司 | Satellite navigation antenna and satellite navigation transceiving device |
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