WO2012131126A1 - Antenne marguerite pour l'émission et la réception d'ondes électromagnétiques polarisées linéairement et circulairement - Google Patents

Antenne marguerite pour l'émission et la réception d'ondes électromagnétiques polarisées linéairement et circulairement Download PDF

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Publication number
WO2012131126A1
WO2012131126A1 PCT/ES2012/070123 ES2012070123W WO2012131126A1 WO 2012131126 A1 WO2012131126 A1 WO 2012131126A1 ES 2012070123 W ES2012070123 W ES 2012070123W WO 2012131126 A1 WO2012131126 A1 WO 2012131126A1
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WIPO (PCT)
Prior art keywords
antenna
petals
reception
daisy
petal
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PCT/ES2012/070123
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English (en)
Spanish (es)
Inventor
Juan LLABRES FOYO
Juan Vassal'lo Sanz
Jorge Caravantes Tortajada
Ángel MEDIAVILLA SÁNCHEZ
Antonio TAZÓN PUENTE
Original Assignee
Consejo Superior De Investigaciones Científicas (Csic)
Universidad De Cantabria
Universidad Complutense De Madrid
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Publication of WO2012131126A1 publication Critical patent/WO2012131126A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H01Q21/26—Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre

Definitions

  • the present invention belongs to the sector of transmitting and / or receiving antennas, of electromagnetic signals, and more precisely it is related to the following sub-sectors of antenna technology: broadband antennas, electric and magnetic dipoles, radiating transmission systems and reception, antennas for communication systems, antennas for television signal receivers, antennas of low cost and visual impact, antennas for observation and surveillance systems, and antennas for frequency inhibiting systems.
  • An antenna is an element or system designed and manufactured to receive or emit electromagnetic waves (EM). From an elementary point of view, the emission consists of transforming an electric potential difference, variable in time, applied to the metallic structure of the system in an EM wave train so that they propagate through the free space around. The opposite is the reception of EM waves.
  • EM waves electromagnetic waves
  • the parameter to be taken into account is the radiation diagram, that is, the representation on a graph, depending on the direction, of the intensity of the EM field.
  • Other parameters to consider are: bandwidth, which is the frequency range in which certain characteristics on directivity or gain are met.
  • bandwidth which is the frequency range in which certain characteristics on directivity or gain are met.
  • width of the radiation beam and the polarization of the emitted or captured signal are to be considered (PH Smith, "Cloverleaf Antenna for FM broadcasting", IRE Proc. 35, December 1947, 1556-1563, although the latter is illustrated and explained in Schelkunoff's book, on page 504 and following).
  • the required radiation pattern requires that its omni-directional character be defined according to the trace defined by the generator of a cone, so that for a mobile, located in a position of latitude determined on the earth's surface, the connection with a geostationary satellite can be ensured regardless of the orientation of the mobile. For those 35 ° and 55 ° elevation mentioned above, the connection for a mobile that moves in the southern and central part of Europe would be ensured.
  • the circular polarization diagram is obtained as a result of the sum of the circular polarization diagrams of each of the 8 microstrip radiators. That is, the microstrip radiators themselves, individually, work in circular polarization. Extensive information on microstrip radiators and clusters of this type of radiators can be found in the books: "Microstrip Antennas" by I. Bhal and P. Bhartia, published by Artech House in 1980, and “Microstrip Antenna Design Handbook", by R. Garg , P. Bhartia, I. Bahl and A. Ittipiboon, published by Artech House in 2001, ISBN 0-89006-513-6.
  • Circular polarization can be obtained from radiant elements that work in linear polarization, by what is called “sequential rotation.” This consists of distributing the elements sequentially (every 3607n for n elements), on a circle, rotated and offset that same amount, as can be seen in “3. Improvement of the co-cross polarization ratio" by J. Barbero and J. Vassal'lo, in the "Contribution from Spain” chapter of the "Final Report of the COST 223 - Antennas in the 1990s, Active Array Antennas Future Satellite and Terrestrial Communications", edited by the European Commission, Directorate General XIII : Telecommunications, Information Market and Exploitation of Research, Brussels, 1995.
  • This technique for generating circular polarization is sufficiently known and valid, but is only applicable when the pointing direction coincides with the zenith of the antenna, that is, it is perpendicular to the plane defined by the circular grouping. In no case is the possibility of obtaining a conical beam in circular polarization mentioned, based on a sequential rotation of radiating elements in linear polarization.
  • Non-omni-directional diagrams in a plane but with a maximum radiation in a certain direction can also be obtained with wire antennas, as is the case of the antenna defined by Podger in its US patent 6,255,998 Bl.
  • This patent defines a radiating element called "Lemniscate Antenna Element” that provides a maximum of radiation with linear polarization, according to the direction perpendicular to the plane that contains the antenna.
  • This podger lemniscate antenna comes to have a configuration similar to Smith's "Cloverleaf Antenna", but with only 2 turns (Smith's has 4 turns), and with the essential difference that the current in the turns of the lemniscate circulates in the opposite direction, while the four turns of the Smith antenna have the same direction of rotation of the current.
  • the Podger patent as well as in a later one of the same inventor (US 6,469,674), the possibility of circularly grouping several lemniscate antennas, all with the same center or feeding point, to improve Some of the characteristics of the set.
  • the present invention is an antenna constituted by the coplanar grouping of radiating wires whose assembly adopts a shape similar to the distribution of petals in a daisy (see figure 1).
  • the radiating wires or petals of the daisy antenna work in resonance, have flat geometry, all have the same structure and are contained in the same plane, called the antenna plane.
  • the only difference between the petals is in the relative distribution of the current flow directions, which determines the shape of the radiation pattern and is essential in the characterization of the operating behavior of the antenna.
  • the reason antenna of this invention patent and which we call “daisy” for simplification is constituted by the coplanar grouping of radiant wires working in resonance, adopting a flower-like shape (see figures 1 and 2), and with a special distribution of currents by the radiating wires that determines and fully characterizes the behavior of the antenna.
  • the radiating wires or petals of the antenna which in their most general configuration take the form of the contour of the petals of the flower, in addition to working in resonance, have flat geometry, are contained in the same plane, called the antenna plane, and placed at the same distance from the center of the antenna, where the antenna power and the circuit that distributes the signal to the petals.
  • the operating frequency band of the daisy antenna is in the range of microwaves and millimeter waves.
  • the radiating wires can be constituted by wires or conductive tubes, or they can also be manufactured by photogravure techniques, being constituted by photogravure tapes on dielectric substrate.
  • the elements that make up the antenna and that can be seen in figures 1 to 6 are: the radiating petals or wires (2), and the distribution circuit (3), formed by adaptation or balun, the splitter, and where appropriate the transmitter lines to carry the signal from the splitter to the petals, when they are located far from the center of the antenna. These elements, together with the antenna petals, are distributed in 3 flat layers parallel to each other, as indicated in Figure 3.
  • FIG. 3 shows the layered distribution, seen according to a cross section to the antenna plane.
  • the petals (2) are located in the intermediate layer, while the metallizations of the signal distribution circuit are located in the upper and lower layers.
  • the power of the antenna (1) connected to the center of the antenna is perpendicular to the plane defined by the antenna, and is done by coaxial line, similar to the stem that supports a daisy flower.
  • the metallisations of the coaxial power cable are electrically connected to the metallizations of the distribution circuit (upper and lower layers of the antenna).
  • Bi-filar lines are an integral part of the distribution circuit, together with the splitter and the adaptation circuit or balun.
  • the adaptation circuit can be adjusted by design, varying the capacity between the metallizations of the upper and lower layers, that is: varying their surface and / or the separation between layers, as well as using separators of different dielectric constant between them.
  • Petals are individual radiating elements, which work in resonance and are characterized in that their structure is based on conductive wires or tapes to produce a certain distribution of currents on which the radiation they produce depends.
  • the simplest structure is that of the electric dipole, but it can also take other forms, such as: • turns with circular, elliptical or polygonal geometry, both regular and irregular, any geometric shape that is the result of a mixture of those mentioned being valid, provided that the total length of the loop is a multiple of the wavelength, for that meets the condition of working in resonance.
  • the petals can take different forms of geometric curves, which converted into wires or conductive tapes can channel the electric current. They must also work in resonance, so their length must be a multiple of the wavelength.
  • Figure 5 shows, for comparison, three two-petal daisy antennas with different geometric shapes each: petals similar to those in the antenna of Figure 2, folded dipoles, and the classic electric dipoles.
  • Figure 6 shows a 6-petal daisy antenna, using electric dipoles as petals.
  • the radiating wires that shape the petals of the daisy antenna can be constituted by wires or conductive tubes, or they can also be manufactured using photogravure techniques, being constituted by photogravure tapes on dielectric substrate.
  • Petals are radiant elements that are characterized by their current distribution.
  • a petal can be, for example, a conductive thread.
  • a Jordan curve that is, any closed curve in the plane that does not cut itself. Examples of Jordan's curves arise from the so-called Cassini ovals. These are defined as the geometric place of the plane that fulfills that the product of the distances to two fixed points (the focal points of the curve), is a constant. These curves are defined by the expression in Cartesian coordinates: ⁇ ...,,, 2, 2 ..2, - ... 2 ..: 2 - XJ _ ..4 ⁇ A
  • Cassini ovals are really pairs of curves (when k> l), symmetrical with respect to the center of coordinates, so they are valid for daisies antennas of even number of petals, but obviously they can also be used as isolated elements for the case of daisy antennae with odd number of petals.
  • the ovals can be connected directly to the divider, or through power lines to connect them electrically to the divider, and thus move them away from the geometric center of the daisy antenna, similar to the case shown in Figure 4.
  • the length of the petal (L), which being the resonant petals, must be a multiple of the wavelength at the center frequency of the antenna's operating band
  • x (t, L, e): ⁇ • L. (t 2 - l) - cos (0) • Lt (t 2 - l) -sin (e)
  • Figure 11 shows the definition of the parameters used in this new petal geometry, which is displaced from the center of the daisy by a distance D.
  • the circumference has a radius of value: V 15552
  • the tangent lines pass through the center of coordinates, and have a slope of:
  • the slope of the tangents is independent of the length of the petal (value related to its operating frequency), and only depends on the central opening angle of the petal (2a), which in this case is fixed at ⁇ / 3.
  • connections between the metallizations of the upper or lower layers and the petals are made by means of short-circuit paths between layers. In this way the ends of the petals are contacted with the signal distribution circuit, one end of the petal is connected to the upper layer and the other to the lower one. Depending on which of the ends is connected to one layer or another, so will the direction of the current flowing through the petal.
  • the relative direction of the currents flowing through the petals characterizes the operation of the antenna, and to obtain a maximum of the radiation pattern in linear polarization, in the direction perpendicular to the plane of the antenna, it is enough that:
  • Figure 13 shows the top view of the metallizations of the upper and lower layers of the 6-petal antenna of Figure 1. Said metallizations make up the distribution circuit (adaptation and divider).
  • Figure 14 shows the distribution of currents in the petals of said antenna.
  • Figure 15 shows the top view of the metallizations of the upper and lower layers of the 6-petal antenna of Figure 4. Said metallizations make up the distribution circuit (adaptation, divider and bi-wire transmission lines).
  • Figure 16 shows the distribution of currents in the petals of said antenna, distribution of currents that is identical to that shown in Figure 14.
  • Figure 17 shows the top view of the metallizations of the upper and lower layers of the antenna 6 petals, whose petals are simple electric dipoles. Comparing this figure with figure 15, the different length of the feeding lines derived from the different size of the petals can be seen. Obviously, the line width depends on the value of the impedance of the petal.
  • Figure 18 shows the distribution of currents in the dipoles or petals of the antenna, and as can be seen said distribution of currents is identical to that shown in Figures 14 and 16 for the other 6-petal antennas.
  • Figure 19 shows the top view of the metallizations of the upper and lower layers of the 2-petal antenna, whose petals are electric dipoles.
  • Figure 20 shows the distribution of currents in the petals of said antenna. Comparing figures 18 and 20, it can be seen that this 2-petal antenna matches the central petals of the 6-petal daisy.
  • the circular polarization is obtained by interleaving two equal daisy antennas, rotated 90 ° to each other, to generate the orthogonal linear polarizations, and adding to one of the antennas the length of a quarter of the guided wavelength in the bi-filar power lines, to introduce the required 90 ° offset between polarizations.
  • the antenna is formed by two equal, coplanar and with the same feeding point superimposed on the same flat, with the following particularities:
  • the antenna power is unique to the two daisy antennas, as well as the adaptation and the splitter. If the daisy antennas have 2 petals each the divisor must be 1: 4; if they have 6 petals, the divider should be 1: 12.
  • the bi-filar lines of the signal distribution circuit to the petals must differ by a quarter of a wavelength, to provide the 90 ° offset necessary to generate the circular polarization. That means that the petals of one of the daisies are distributed inside the petal distribution of the other daisy. Since each of the daisy antennas that generate the linear polarizations must have an even number of petals (2, 4, 6 ... n petals), the daisy antennas that generate circular polarization must be 4, 8, 12 .. . 4n petals
  • Figure 21 shows the distribution circuit, separated in layers 2 and 3 according to the exploded view shown in Figure 3. It can be seen in said figure, the different length of the bi-wire feed lines to each of the daisies of 2 petals that make up this antenna.
  • Figure 22 shows the distribution of petals in layer 2 of the daisy with 4 petals (electric dipoles), which generates circular polarization. In this figure, together with the distribution of currents, the lines of symmetry corresponding to each pair of petals, or what is the same, to each polarization can be seen: 5A for petals 2A, and 5B for petals 2B.
  • Figure 23 shows the overall view of the 3 superimposed layers that shape the 4-petal daisy antenna, whose petals are electric dipoles.
  • Figure 24 shows the distribution circuit in layers 2 and 3 of a 12-petal daisy that generates circular polarization. It would therefore be an antenna that is the sum of two 6-petal daisy antennas, with the petals of both overlapping.
  • half (6) of the power lines differ in length from those of the other half, in a quarter of guided wavelength, and that the lines of one of the 6-petal daisy antennas are interspersed between those of the other.
  • Figure 25 shows the distribution of petals in the intermediate layer, also showing the distribution of currents. This figure shows what is the set of 6 petals generated by each of the two linear orthogonal polarizations necessary for circular polarization.
  • Figure 26 shows the overall view of the 3 layers of the 12-petal daisy antenna that generates circular polarization.
  • the daisy antenna is in turn the sum of 2 sub-antenna daisies, so it must have 4n petals.
  • the circular polarization could be obtained by rotating 30 ° , 90 ° or 150 °, and offset 30 °, 90 ° or 150 ° respectively, obviously obtaining cross polarization in other directions with different signal level.
  • the directivity of the daisy antenna that generates a maximum of radiation in the direction perpendicular to the plane of the antenna, both in linear and circular polarization, can be increased by a maximum of 3 dB, by placing a mass plane parallel to the plane of the antenna, at a distance equal to a quarter of the wavelength of the operating frequency of the antenna, thus being able to add in phase, in the desired direction, the signal reflected in the ground plane.
  • the essential characteristic of the daisy antenna is in the distribution of the direction of flow of the current through the petals, and this only has two possibilities: to come or go, which means that in the petals it occurs, in addition to a change of petal position relative to the daisy antenna assembly, a binary phase change of the radiated signal for each petal, that is: 0 or 180 °, depending on the direction of the current flowing through it.
  • the antenna would have a configuration that increases in complexity depending on the volume of the radiating element considered, but in essence it would have an electromagnetic operation similar to that of the previously defined daisy antenna and based on the use of wires.
  • Figure 27 shows the sketch of a 6-petal daisy antenna with a maximum of radiation in the direction perpendicular to the plane of the antenna (performance similar to those described in example 1), where the petals are small speakers in a rectangular guide.
  • EXAMPLE 1 Margarita antenna for maximum radiation in linear polarization, in the direction perpendicular to the antenna plane
  • Figure 28 shows the geometry of the upper and lower layers that make up the distribution circuit and indicates the distribution of currents, of a 4-petal daisy antenna that generates a maximum in linear polarization in the direction perpendicular to the plane of the antenna.
  • the base of the distribution circuit is a metal square 30 mm side.
  • the distance between layers is 5 mm, so the separation between the upper and lower layers is 10 mm.
  • Figure 29 shows the geometry of the central layer containing the 4 petals that are generated by photogravure methods on a dielectric substrate of low effective permittivity.
  • the width of the metal tape is 10 mm, and the length of the petal is 432 mm.
  • Figures 30 and 31 show the two linear electric field components ⁇ and ⁇ , as well as the gain value, in planes E and H respectively, of the radiation pattern of the four-petal antenna of Figures 28 and 29, a the frequency of 800 MHz.
  • Figure 21 shows the geometry of the upper and lower layers that make up the distribution circuit and indicates the distribution of currents, of a 4-petal daisy antenna, which generates a maximum in circular polarization in the direction perpendicular to the plane of the antenna.
  • the base of the distribution circuit is a metal square 40 mm side, and the power lines have a width of 20 mm.
  • the difference in length between the lines that feed the dipoles is 50 mm.
  • the distance between layers is 5 mm, so the separation between the upper and lower layers is 10 mm.
  • Figure 22 shows the geometry of the central layer containing the 4 petals, which in this case are 220 mm long electric dipoles.
  • the width of the metal tape is 10 mm, and the length of the petal is 432 mm. All layers are generated by photogravure methods on dielectric substrate of low effective permittivity.
  • Figure 23 shows the 3 layers superimposed to give an idea of the set.
  • Figure 36 shows the axial ratio in dB as a function of the frequency expressed in GHz.
  • Figure 1 shows a 6 petal daisy antenna.
  • FIG. 2 shows 4 and 2 petal daisy antennas
  • Figure 3 shows a cross section of a daisy antenna
  • Figure 4 shows a 6-petal daisy antenna with power lines in the distribution circuit
  • Figure 5 shows 2-petal daisy antennas, with different petal geometry: polygonal petals, folded dipoles and electric dipoles
  • Figure 6 shows a 6-dipole daisy antenna
  • Figure 9 shows a geometric curve derived from the expressions [2]
  • Figure 10 shows a geometric composition of a 6-petal daisy from the expressions [2]
  • Figure 11 shows a geometric curve derived from the expressions [3]
  • Figure 12 shows a geometric approximation to the curve of Figure 7, by a circle and two lines defined in [4]
  • Figure 13 shows metallizations of the upper and lower layers of the 6-petal daisy antenna of Figure 1.
  • Figure 14 the metallization of the central layer of petals, indicating the distribution of current lines, of the daisy antenna shown in Figure 1
  • Figure 15 shows metallizations of the upper and lower layers of the 6-petal daisy antenna of Figure 4.
  • Figure 16 shows the metallization of the central layer of petals, indicating the distribution of current lines, of the daisy antenna shown in Figure 4.
  • Figure 17 shows metallizations of the upper and lower layers of the 6-petal daisy antenna of Figure 6.
  • Figure 18 shows the metallization of the central layer of petals, indicating the distribution of current lines, of the daisy antenna shown in Figure 6.
  • Figure 19 shows metallizations of the upper and lower layers of the 2-petal daisy antenna of Figure 5 (electric dipoles).
  • Figure 20 shows the metallization of the central layer of petals, indicating the distribution of current lines, of the daisy antenna shown in Figure 5 (electric dipoles).
  • Figure 21 shows metallizations of the upper and lower layers of the 4-petal daisy antenna that generates circular polarization.
  • Figure 22 shows the metallization of the central petal layer, indicating the distribution of current lines, of the 4-petal daisy antenna that generates circular polarization.
  • Figure 23 shows a 4-petal daisy antenna that generates circular polarization.
  • Figure 24 shows metallizations of the upper and lower layers of the 12-petal daisy antenna that generates circular polarization.
  • Figure 25 shows a metallization of the central layer of petals, indicating the distribution of current lines, of the 12-petal daisy antenna that generates circular polarization.
  • Figure 26 shows a 12-petal daisy antenna that generates circular polarization.
  • Figure 27 shows a 6-petal daisy antenna with a maximum of radiation in the direction perpendicular to the plane of the antenna, and where the petals are horns in a rectangular guide.
  • Figure 28 shows metallizations of the upper and lower layers of the 4-petal daisy antenna of Example 1, for linear polarization in the direction perpendicular to the antenna plane.
  • Figure 29 metallization of the central layer of petals, indicating the distribution of current lines, of the 4-petal daisy antenna of Example 1, for linear polarization in the direction perpendicular to the plane of the antenna.
  • Figure 30 shows a flat section E of the radiation diagram, at the frequency of 800 MHz, of the 4-petal antenna of Figures 28 and 29.
  • the gain values are expressed in dBi (diamond curve), and dB the of the two components of the radiated electric field: ⁇ (triangle curve) and ⁇ (square curve).
  • Figure 31 shows a flat section H of the radiation diagram, at the frequency of 800 MHz, of the 4-petal antenna of Figures 28 and 29.
  • the gain values are expressed in dBi (diamond curve), and dB the of the two components of the radiated electric field: ⁇ (triangle curve) and ⁇ (square curve).
  • the gain values are expressed in dBi (diamond curve), and in dB the of the two orthogonal components in circular polarization to the right and left of the electric field RHCP (square curve) and LHCP (triangle curve).
  • the gain values are expressed in dBi (diamond curve), and in dB the of the two orthogonal components in circular polarization to the right and left of the electric field RHCP (square curve) and LHCP (triangle curve).
  • the gain values are expressed in dBi (diamond curve), and in dB those of the two orthogonal components in circular polarization to the right and left of the electric field RHCP (square curve) and LHCP (triangle curve).
  • the gain values are expressed in dBi (diamond curve), and in dB those of the two orthogonal components in circular polarization to the right and left of the electric field RHCP (square curve) and LHCP (triangle curve).
  • Figure 36 shows a graphical representation of the axial ratio in dB, with respect to the frequency expressed in GHz, of the 4-petal daisy antenna of Figures 21, 22 and 23.

Abstract

La présente invention concerne une antenne constituée par le regroupement coplanaire d'une nombre pair de fils rayonnants dont l'ensemble prend une forme ressemblant à la distribution de pétales dans une fleur marguerite (voir figure 1). Les fils rayonnants ou pétales de l'antenne marguerite travaillent en résonance, présentent une géométrie plane, ont tous la même structure et sont contenus dans un même plan, appelé plan de l'antenne. La seule différence entre les pétales réside dans la distribution relative des sens de circulation du courant, qui détermine la forme du diagramme de rayonnement et caractérise le comportement de l'antenne avec pour objectif d'offrir à l'utilisateur une vaste gamme d'applications.
PCT/ES2012/070123 2011-03-29 2012-02-28 Antenne marguerite pour l'émission et la réception d'ondes électromagnétiques polarisées linéairement et circulairement WO2012131126A1 (fr)

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ES201130473A ES2395429B1 (es) 2011-03-29 2011-03-29 Antena margarita para emision y recepcion de ondas electromagneticas polarizadas lineal y circularmente.
ESP201130473 2011-03-29

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107799891A (zh) * 2017-09-29 2018-03-13 深圳大学 一种应用于5g通信的磁电偶极子天线
CN110620291A (zh) * 2019-08-29 2019-12-27 电子科技大学 一种用于卫星通信的圆极化偶极子天线
CN114421151A (zh) * 2022-03-28 2022-04-29 陕西海积信息科技有限公司 赋形全向圆极化天线

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005072716A (ja) * 2003-08-20 2005-03-17 Furukawa Electric Co Ltd:The 円偏波アンテナ
EP2009735A1 (fr) * 2007-06-22 2008-12-31 Philippe Herman Antenne a diversité de polarisation pour la transmission et/ou la reception de signaux audio et/ou video

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005072716A (ja) * 2003-08-20 2005-03-17 Furukawa Electric Co Ltd:The 円偏波アンテナ
EP2009735A1 (fr) * 2007-06-22 2008-12-31 Philippe Herman Antenne a diversité de polarisation pour la transmission et/ou la reception de signaux audio et/ou video

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107799891A (zh) * 2017-09-29 2018-03-13 深圳大学 一种应用于5g通信的磁电偶极子天线
CN110620291A (zh) * 2019-08-29 2019-12-27 电子科技大学 一种用于卫星通信的圆极化偶极子天线
CN114421151A (zh) * 2022-03-28 2022-04-29 陕西海积信息科技有限公司 赋形全向圆极化天线
CN114421151B (zh) * 2022-03-28 2022-08-02 陕西海积信息科技有限公司 赋形全向圆极化天线

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