EP3671955A1 - Monopolare draht-plattenantenne für differentialverbindung - Google Patents

Monopolare draht-plattenantenne für differentialverbindung Download PDF

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Publication number
EP3671955A1
EP3671955A1 EP19219115.3A EP19219115A EP3671955A1 EP 3671955 A1 EP3671955 A1 EP 3671955A1 EP 19219115 A EP19219115 A EP 19219115A EP 3671955 A1 EP3671955 A1 EP 3671955A1
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EP
European Patent Office
Prior art keywords
antenna
supply loop
ground plane
loop
roof
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.)
Granted
Application number
EP19219115.3A
Other languages
English (en)
French (fr)
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EP3671955B1 (de
Inventor
Olivier Clauzier
Serge Bories
Christophe Delaveaud
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Publication of EP3671955A1 publication Critical patent/EP3671955A1/de
Application granted granted Critical
Publication of EP3671955B1 publication Critical patent/EP3671955B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
    • H01Q19/138—Parallel-plate feeds, e.g. pill-box, cheese aerials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole

Definitions

  • the technical field of the invention relates to monopolar wire-plate antennas. More particularly, the invention relates to a monopolar wire-plate antenna comprising a ground plane, a roof arranged at a distance from the ground plane, and at least one electrically conductive element electrically connecting the ground plane to the roof.
  • a 100-wire monopolar plate antenna of the type of this article by Ch. Delumbled et al., comprises a ground plane 101, an electrically conductive planar element 102, called roof, one or more electrically conductive elements 103a, 103b, called (s) ground wire (s), connecting the roof 102 to the ground plane 101 and possibly a dielectric substrate 104 on which the roof 102 can be printed.
  • the antenna 100 comprises a coaxial feed probe 105 having a central core 106a passing through the ground plane 101, without electrical contact with it. ci, and extending to the roof 102 so as to establish an electrical connection therewith.
  • the core 106a is also successively surrounded by a sheath 106b of dielectric material 106b, then a metal tube 106c electrically connected to the ground plane, the sheath 106b of dielectric material providing electrical insulation between the core 106a and the metal tube 106c.
  • Such a coaxial feed probe 105 forms a coaxial waveguide in which a quasi-transverse electric magnetic (TEM) mode is established to guide and propagate the wave in the waveguide.
  • This type of antenna 100 makes it possible to emit an electromagnetic field, also called electromagnetic wave, with a high efficiency for frequencies located below the resonance modes of cavity TM nm (for “Transverse Magnetic” of indices n and m) classics for this antenna geometry.
  • TM nm for “Transverse Magnetic” of indices n and m
  • resonance of classical cavity we mean the particular distribution of an electromagnetic field resulting from the resolution of Maxwell's equations with the boundary conditions imposed by the topology of the antenna.
  • this monopolar wire-plate antenna can be supplied asymmetrically from a suitable radiofrequency transmitter having an asymmetrical connection (for example a microstrip line or a coaxial connector).
  • Such an antenna 100 has the advantage of having a small footprint, it is therefore particularly suitable for being associated with components originating from microelectronics, in particular within a mobile device.
  • a disadvantage linked to this type of antenna is that its technological integration in a small volume can imply that the radiofrequency transmitter connected to the antenna is with differential connection instead of being asymmetrical.
  • the differential connection transmitter generates two signals of equal amplitude and in phase opposition: the transmitter then forms a so-called “balanced” power source for the antenna.
  • the coaxial feed probe 105 it is necessary to transform the balanced feed into an unbalanced feed to feed the monopolar wire-plate antenna using this coaxial feed probe 105
  • a balun also called a balun
  • the balun makes it possible to adapt the differential connection of the radiofrequency transmitter so that it is compatible with the coaxial supply probe.
  • balun well known to those skilled in the art, comes from the English words BALanced (for balanced, or balanced, in French) and UNbalanced (for unbalanced, or unbalanced, in French).
  • a drawback of this adaptation of the differential connection is that it increases the bulk of the radio frequency front ends, implying the addition of additional components to be assembled which are generally not integrated on a chip, this results in radio frequency losses.
  • there is a need to develop a solution making it possible to feed an antenna with a roof, in particular a capacitive one, and with a ground plane electrically connected to each other without having to resort to the use of a balun when the antenna is intended to be connected to a differential connection transmitter.
  • a monopolar wire-plate antenna comprising a ground plane, a first radiating element in the form of a capacitive roof, and a second radiating element in the form of a conductive wire connecting the capacitive roof to the ground plane.
  • This antenna also includes a cable, or coaxial supply probe, the central core of which is connected to the capacitive roof.
  • the power source for the coaxial power probe is a radiofrequency transmitter with differential connection, this again requires the use of a balun.
  • the object of the invention is to allow a supply of a monopolar wire-plate antenna not requiring the presence of a balun.
  • the invention relates to a monopolar wire-plate antenna comprising a ground plane, a roof arranged at a distance from the ground plane, at least one electrically conductive element electrically connecting the ground plane to the roof, this antenna being characterized in that it comprises a supply loop arranged substantially orthogonal to the ground plane, said supply loop being open so that it has two opposite longitudinal ends arranged so as to be connected to a differential connection.
  • the power supply loop allows, during the operation of the monopolar wire-plate antenna supplied by the transmitter with differential connection during the emission of a signal or by an electromagnetic wave propagating in the environment of the antenna during reception of a signal, to impose a distribution of the electromagnetic field in a suitable way between the ground plane and the roof to allow the antenna wire-monopolar plate to present a desired impedance and, if necessary, emit a satisfactory electromagnetic wave.
  • the feed / excitation of the antenna by the feed loop makes it possible to obtain a symmetrical system from which the reduction of the propagation of electric currents on the ground plane of the antenna results, thus limiting the influence of the close context of the antenna, such as for example the influence of a hand of a person holding a device equipped with the antenna.
  • the invention also relates to a radiofrequency device comprising a monopolar wire-plate antenna as described and a radiofrequency transmitter with differential connection connected to the supply loop.
  • the differential connection of the radiofrequency transmitter comprises first and second connection terminals
  • the antenna comprises a balanced waveguide, the balanced waveguide comprising first and second electrical conductors
  • the first electrical conductor is connected, on the one hand, at one of the longitudinal ends of the supply loop and, on the other hand, at the first connection terminal
  • the second electrical conductor is connected, on the one hand, to the other of the longitudinal ends of the supply loop and, on the other hand, to the second connection terminal.
  • the operating frequency of the monopolar wire-plate antenna corresponds to the frequency at which the monopolar wire-plate antenna transmits, or receives, an electromagnetic wave, in particular a radio wave, also called if necessary signal emitted. or received / received signal. More generally, to speak of this electromagnetic wave, reference is made to the electromagnetic wave to be processed (whether receiving or transmitting) at the operating frequency of the monopolar wire-plate antenna.
  • the monopolar wire-plate antenna is configured to transmit and / or receive a corresponding electromagnetic wave.
  • an antenna operating wavelength corresponds to the spatial period of the electromagnetic wave to be processed by the antenna propagating in a vacuum or in the air when the monopolar wire-plate antenna includes such a propagation medium.
  • ⁇ 0 is associated with the propagation of the electromagnetic wave in vacuum or in air.
  • the propagation medium of the monopolar wire-plate antenna corresponds to a medium for transmitting and / or receiving the electromagnetic wave to be treated.
  • the propagation medium is, if necessary, the medium from which the antenna picks up the electromagnetic wave to be treated or to which the antenna emits the electromagnetic wave to be treated.
  • the wave electromagnetic to be propagated propagates in a medium of propagation of the monopolar wire-plate antenna (for example air, vacuum, a dielectric material, etc.) in contact with one or more radiating parts of the antenna, and the operating wavelength of the antenna (that is to say the wavelength associated with the propagation of the electromagnetic wave to be processed at the operating frequency of the antenna) is then noted ⁇ g : we also speak of guided wavelength. Subsequently, when the monopolar wire-plate antenna is said to be supplied / excited, it is at the operating wavelength of the antenna.
  • a medium of propagation of the monopolar wire-plate antenna for example air, vacuum, a dielectric material, etc.
  • the monopolar wire-plate antenna is said to be adapted in impedance when it has a reflection coefficient strictly lower than a given level (typically -9.54 dB for communication terminals, and -15 dB for example for base stations ).
  • the invention relates to an antenna 100 monopolar wire-plate, also simply called antenna 100, comprising a ground plane 101 (in particular planar), a roof 102 (in particular planar) arranged at a distance from the ground plane 101, and at at least one electrically conductive element 103a, 103b electrically connecting the ground plane 101 to the roof 102.
  • antenna 100 monopolar wire-plate, also simply called antenna 100, comprising a ground plane 101 (in particular planar), a roof 102 (in particular planar) arranged at a distance from the ground plane 101, and at at least one electrically conductive element 103a, 103b electrically connecting the ground plane 101 to the roof 102.
  • two electrically conductive elements 103a, 103b are shown by way of example: the number of these electrically conductive elements 103a, 103b may be higher.
  • Each electrically conductive element 103a, 103b electrically connecting the ground plane 101 to the roof 102 is also called a short-circuit element between the roof 102 and the ground plane 101, or ground wire.
  • Each electrically conductive element 103a, 103b in particular forms a radiating part of the antenna 100.
  • the roof 102 is electrically conductive, and is also called planar element, or plate, electrically conductive.
  • the ground plane 101 is electrically conductive and preferably adopts a planar shape.
  • the ground plane 101, the roof 102 and each electrically conductive element 103a, 103b may each be, without limitation, copper, aluminum or steel.
  • this antenna 100 includes a feed loop 107 in particular called “feed loop of the antenna 100”.
  • the supply loop 107 is open so that it has two opposite longitudinal ends 108, 109 arranged so as to be connected to a differential connection.
  • the differential connection is notably that of a 200 radio frequency transmitter ( figure 6 ).
  • the supply loop 107 is arranged substantially orthogonal to the ground plane 101. Thanks to this supply loop 107, there is no longer any need to use a balun or other circuit performing an asymmetrical line transformation in symmetrical line (or vice versa) between the radiofrequency transmitter and the antenna 100.
  • the supply loop 107 can be directly connected to terminals 201, 202 of the transmitter 200 ( figure 6 ), or via a differential waveguide 110 as will be described later.
  • the electromagnetic wave generated by the radiofrequency transmitter can feed the antenna 100 via this supply loop 107 arranged under the roof 102 in order to emit this electromagnetic wave as signal.
  • the antenna 100 When the antenna 100 is used to receive a signal, the antenna 100 picks up the signal (the electromagnetic wave) of the free space, this signal supplying the supply loop 107 of the antenna 100 in a manner suitable for transmitting this signal to the radio frequency transmitter.
  • the signal the electromagnetic wave
  • the supply loop 107 can be arranged between the roof 102 and the ground plane 101, this has the advantage of satisfactory integration, and the advantage of reducing the overall size of the antenna 100 by integrating the loop supply 107 in a separation space between the roof 102 and the ground plane 101.
  • substantially orthogonal it is understood in particular to be orthogonal or orthogonal to more or less ten degrees.
  • substantially orthogonal can be replaced by “orthogonal”.
  • substantially parallel it is understood in particular to be parallel or parallel to more or less ten degrees.
  • substantially parallel can be replaced by “parallel”.
  • supply loop 107 arranged substantially orthogonal to the ground plane 101 it is understood in particular that the supply loop 107 extends along an included profile, or can be projected orthogonally, in a plane substantially orthogonal to the ground plane 101.
  • the profile of the supply loop 107 can travel, along the length of the supply loop 107, within a plane substantially orthogonal to the ground plane 101.
  • the profile of the supply loop 107 is rectangular in a plane substantially orthogonal to the ground plane 101 and in particular to the roof 102.
  • the supply loop 107 can be placed in a plane substantially orthogonal to the plane mass 101.
  • the invention also relates to a radiofrequency device 1000, in particular as illustrated by way of example in figure 6 , comprising the antenna 100 as described and the radiofrequency transmitter 200 with differential connection connected to the supply loop 107, in particular to the supply loop 107 of the antenna of the type of figures 2 and 3 (as illustrated in figure 6 ) or the antenna of the type illustrated in Figures 4 and 5 .
  • the radiofrequency transmitter 200 is an electronic transmission-reception component whose coupling to the antenna 100 (that is to say the connection to the supply loop 107) makes it possible to transmit or receive the electromagnetic wave. corresponding, or signal, by the antenna 100.
  • the radiofrequency transmitter can in particular supply the antenna by a discrete port for example of 50 ohms over its entire operating band.
  • the radiofrequency transmitter 200 has two terminals 201, 202 from which the electromagnetic wave, making it possible to supply the antenna 100 with view of transmitting the signal is transmitted in a balanced mode.
  • the radiofrequency transmitter 200 can send on its two terminals 201, 202 respectively two signals of equal amplitude and in phase opposition.
  • the radiofrequency transmitter 200 of the figure 6 and more particularly the differential connection, comprises a first connection terminal 201 denoted “+”, and a second connection terminal 202 denoted “-”.
  • antennas powered from a source in differential mode in mobile terminals such as smartphones there are very often antennas powered from a source in differential mode in mobile terminals such as smartphones ("smartphone" in English).
  • the use of a differential supply whose source is the radiofrequency transmitter 200 in association with the present antenna 100 does not require the use of a balun, and can make it possible to make the structure of the antenna symmetrical.
  • the signal picked up by the antenna 100 is transmitted to the differential connection of the transmitter by two signals of equal amplitude and in phase opposition generated within the supply loop 107 when it is supplied by the signal picked up by the antenna 100.
  • such an antenna 100 has the advantage that the currents on its ground plane 101 are limited, thus limiting the influence of the close context of the antenna 100 such than a hand of a person holding the smart phone having this antenna 100.
  • an electromagnetic field should be formed in accordance with the mode which is established under the roof 102.
  • the electric field, resulting from this electromagnetic field is oriented according to the Z axis, that is to say substantially orthogonal to the ground plane 101.
  • the supply loop 107 is orthogonal to the ground plane 101.
  • the supply loop 107 has parts substantially orthogonal to the ground plane 101 in which currents can propagate.
  • the supply loop 107 preferably comprises two regions Z1, Z2 (shown dotted in figures 3, 5 and 6 ) excitation of the antenna 100 formed by parts of the supply loop 107 substantially orthogonal to the ground plane 101.
  • the currents must be in phase, that is to say -to say oriented in the same direction in particular substantially parallel to the axis Z, and these currents are of close amplitudes, when the antenna 100 is supplied by the radiofrequency transmitter 200 or by the signal which it picks up.
  • the supply loop 107 is notably configured so that it exhibits, during the operation of the antenna 100 (that is to say when the antenna 100 transmits or receives a signal), two regions Z1, Z2 for excitation of the antenna 100 in which the currents are in phase and circulate substantially orthogonally with respect to the ground plane 101.
  • the currents which circulate in the supply loop 107, and in particular in parts of the supply loop 107 extending substantially orthogonally with respect to to the ground plane 101 are in phase and preferably of close amplitudes when this antenna 100 transmits or receives a signal.
  • the supply loop 107 advantageously comprises two parts substantially orthogonal to the ground plane 101: this allowing the supply loop 107 to take advantage of the currents substantially orthogonal to the ground plane 101 and in phase to excite the antenna 100 in a suitable manner during its operation.
  • the supply loop 107 comprises (see in particular the figures 2 to 5 ) a first part 1071 distal from the ground plane 101, a second part 1072 proximal to the ground plane 101, a third part 1073 connecting the first and second parts 1071, 1072 (in particular connecting two longitudinal ends of the first and second parts 1071, 1072 ).
  • the opposite longitudinal ends 108, 109 of the supply loop 107 are then arranged opposite the third part 1073, that is to say on one side of the supply loop 107 opposite the third part 1073.
  • Such a supply loop 107 is very particularly suitable for obtaining the vertical currents in phase desired to properly excite the electromagnetic field under the roof 102 of the antenna 100 and in particular between the roof 102 and the ground plane 101 when the antenna 100 transmits or receives a signal.
  • the first and second parts 1071, 1072 extend along their length substantially parallel to the ground plane 101
  • the third part 1073 extends along its length substantially orthogonally to the ground plane 101.
  • the supply loop 107 may include a fourth part 1074 ( figures 2 to 5 ) connected to at least one of the first and second parts 1071, 1072, this fourth part 1074 being located on the side of the supply loop 107 where its longitudinal ends 108, 109 are arranged.
  • the first, third, second and fourth parts 1071, 1073, 1072, 1074 are arranged successively so as to delimit the contour of the supply loop 107.
  • the currents substantially orthogonal to the ground plane 101 referred to above flow in particular in the third and fourth parts 1073, 1074.
  • the fourth part 1074 is, in particular along its length, substantially orthogonal to the ground plane 101.
  • the arrangement of the longitudinal ends 108, 109 opposite to the supply loop 107 opposite its third part 1073 allows to favor, during the operation of the antenna 100, obtaining currents flowing in phase along the Z axis, that is to say in the third and fourth parts 1073, 1074 substantially orthogonal a u ground plan 101.
  • the supply loop 107 may be such that it includes the fourth part 1074 comprising a first portion 1074a extending from the first part 1071 of the supply loop 107 in particular towards the second part 1072 of the supply loop 107.
  • the first portion 1074a has one of the longitudinal ends 108 of the supply loop 107.
  • the fourth part 1074 of the supply loop 107 comprises a second portion 1074b extending from the second part 1072 of the supply loop 107 in particular towards the first part 1071 of the supply loop 107, this second portion 1074b comprising the other of the longitudinal ends 109 of the supply loop 107 ( figures 2 to 5 ).
  • the first and second portions 1074a, 1074b can have identical dimensions so that the excitation of the supply loop 107 by the transmitter 200 can be done in the middle of the fourth part 1074, or alternatively dimensions different.
  • the supply loop 107 has a horizontal symmetry favoring the balance of the currents over the entire perimeter of the supply loop 107 and therefore in the third and fourth parts 1073, 1074 substantially orthogonal to the ground plane 101, this being advantageous for the proper functioning of the antenna 100.
  • the fourth part 1074 extends from the first part 1071 of the supply loop 107 in particular towards the second part 1072 of the supply loop 107, and the fourth part 1074 comprises one of the longitudinal ends 108 of the loop supply 107.
  • the second part 1072 of the supply loop 107 comprises the other of the longitudinal ends 109 of the supply loop 107.
  • the fourth part 1074 extends from the second part 1072 in particular towards the first part 1071, and the fourth part 1074 comprises one of the longitudinal ends 109 of the supply loop 107.
  • the first part 1071 has the other of the longitudinal ends 108 of the supply loop 107.
  • the second and third cases are functional alternatives to the first case which is preferred.
  • the excitation regions Z1, Z2 of the antenna 100 are two in number and are advantageously formed by the third and fourth parts 1073, 1074.
  • the roof 102 is in particular a so-called “capacitive” roof considered to be small compared to the operating wavelength of the antenna 100, that is to say that the dimensions of the roof 102 are in particular strictly less than ⁇ g / 4.
  • the radiofrequency transmitter 200 can be connected directly to the power supply loop 107, or can be connected to the power supply loop via a balanced waveguide 110, also called differential waveguide.
  • This balanced waveguide 110 belongs to the antenna 100.
  • the waveguide 110 comprising first and second electrical conductors 111, 112, for example adopting the form of electrically conductive tracks.
  • the first electrical conductor 111 is connected to one of the longitudinal ends 108 of the supply loop 107 and the second electrical conductor 112 is connected to the other of the longitudinal ends 109 of the supply loop 107.
  • the guide waves is said to be “balanced” because it allows, thanks to its electrical conductors 111, 112, where appropriate, the propagation of the electromagnetic wave supplying the supply loop 107 generated by the radiofrequency transmitter 200 up to the supply loop 107 or the propagation of the electromagnetic wave picked up (that is to say the signal picked up) by the antenna 100 from the feed loop 107 to the radiofrequency transmitter 200.
  • This has the advantage to be able to adapt the distance between the antenna 100 and the radiofrequency transmitter 200.
  • These first and second electrical conductors 111, 112 make it possible to propagate respectively two signals of equal amplitude and in phase opposition from which it results, where appropriate, from the propagation of the electromagnetic wave supplying the antenna 100 originating from the radiofrequency transmitter 200 or from the electromagnetic wave picked up by the antenna 100.
  • the first conductor electrical 111 is also connected to the first connection terminal 201, and the second electrical conductor 112 is also connected to the second connection terminal 202.
  • the balanced waveguide 110 adopts a symmetrical geometry to ensure proper propagation of the wave electromagnetic power supply.
  • the balanced waveguide 110 can take the form of coplanar microstrip lines, twin lines, a two-wire line.
  • the waveguide 110 is not necessary if the supply loop 107 can be directly connected to the radiofrequency transmitter 200.
  • the two opposite longitudinal ends 108, 109 of the loop supply 107 can be connected a differential connection of a differential waveguiding device, this differential device can be the balanced waveguide 110 or the connection terminals 201, 202 of the radiofrequency transmitter 200.
  • part of the supply loop 107 may be formed by a portion of the roof 102, this is illustrated in particular figure 9 where the third and fourth parts 1073, 1074 are in direct contact with the roof 102 which delimits the first part of the supply loop 107.
  • the supply loop 107 can be in contact with the roof 102 ( figures 3, 5 , 7 and 8 ) or can be located at a distance from the roof 102 ( figure 10 ).
  • a part, in particular the first part 1071 described above is formed by a portion of the roof 102, or is in contact with the roof 102, makes it possible to limit the size of the antenna 100 along the axis Z , for example by reducing the separation distance between the roof 102 and the ground plane 101.
  • An additional advantage of the supply loop 107, part of which is delimited by the roof 102, is that this reduces the complexity of the manufacturing process of the antenna 100 since there will be one less metallization level to deposit.
  • the perimeter, also called length, of the feed loop 107 has an impact on the impedance matching of the antenna 100.
  • the length of the feed loop 107 in the context of the example of the narrowband antenna ( figures 2 and 3 ) whose impedance matching is normalized to 50 Ohms, it is proposed to fix the dimensions of the supply loop 107 along the X axis (i.e. the length of the first part 1071 and the length of the second part 1072) at 5 mm for different case studies for which the length of the supply loop 107, also called perimeter noted P of the supply loop 107, is respectively fixed at 14 mm, at 14 , 5 mm and 15 mm: it follows that the height of the supply loop 107 along the Z axis is respectively 2 mm, 2.25 mm and 2.5 mm for these different case studies.
  • the opposite longitudinal ends 108, 109 of the feed loop 107 are located equidistant, for example at 0.25 mm, from the middle of the fourth part 1074 mentioned above along the Z axis.
  • the reflection coefficient (in dB) of the antenna 100 is a function of the frequency, normalized to 50 ⁇ , for these three case studies of the antenna 100, it is possible to note that the frequency of operation of the antenna 100 for which the best impedance adaptation of the antenna 100 is obtained decreases with the increase in the perimeter P of the supply loop 107.
  • the adaptation of the antenna 100 operates as soon as the perimeter of the loop is of optimal dimension close to ⁇ 0 / 3.6, where ⁇ 0 is the operating wavelength of antenna 100.
  • the phasing of the currents in the excitation regions Z1, Z2 can thus take place at lower frequencies.
  • the feed loop 107 preferably has a length, between its two opposite longitudinal ends 108, 109, between ⁇ g / 3.5 and ⁇ g / 3.7 with ⁇ g the operating wavelength of the antenna 100 in the medium of propagation of the antenna 100.
  • the propagation medium of the antenna 100 is the medium in contact with each radiating element of the antenna 100, for example the medium in contact with each electrically conductive element 103a, 103b. This propagation medium can be air or a dielectric material.
  • the different case studies are such that the length of the supply loop 107 varies between 16.5 mm and 18.5 mm in a step of 0.5 mm, or five case studies with P respectively equal at 16.5mm, 17mm, 17.5mm, 18mm and 18.5mm.
  • the result that the height of the supply loop 107 along the Z axis for these different case studies is respectively 2.75 mm, 3 mm, 3.25 mm, 3.5 mm, 3.75 mm.
  • the adaptation of the antenna 100 s' operates as soon as the perimeter of the feed loop 107 is of optimal dimension close to ⁇ 0/2 , where ⁇ 0 is the operating wavelength of the antenna 100 when the medium of propagation of the antenna is the air.
  • the equilibrium of the excitation of the antenna 100, in the excitation regions Z1, Z2, in amplitude and in phase on the current density is lost when the supply loop 107 has too large a perimeter or too weak vis-à-vis its optimal dimension.
  • the currents in the excitation regions Z1, Z2 of the antenna 100 are phase shifted.
  • the currents are in phase and of the same amplitude in the regions Z1, Z2 excitation of the antenna 100.
  • the antenna 100 having a feed loop 107 with a perimeter P equal to 16.5 mm and with the increase in the operating frequency of the antenna 100 it is found that the phasing of the currents improves in the excitation regions Z1, Z2.
  • the antenna 100 comprising a feed loop 107 with a perimeter P equal to 18.5 mm the equilibrium in the regions Z1, Z2 of excitation of the antenna 100 is lost in amplitude and in phase on current density with increasing frequency.
  • the supply loop 107 preferably has a length, between its two opposite longitudinal ends 108, 109, between ⁇ g / 3 and ⁇ g / 1.6 with ⁇ g the operating wavelength of the antenna 100, in particular in the propagation medium of the antenna 100.
  • the width of the feed loop 107 in particular measured along the Y axis, can also be adapted as a function of the desired characteristics of the antenna 100.
  • the increase in the width of the feed loop 107 leads to an adaptation of the antenna 100 for lower operating frequencies. This is synonymous with an elongation of the loop equivalent to the supply loop 107 linked to the increase in its width.
  • a width of the supply loop 107 of approximately 0.5 mm is optimal for a good adaptation (strictly less than -10 dB) according to a normalization impedance of 100 ohms for an antenna operating frequency between 6.3 GHz and 9 GHz.
  • Such a monopolar wire-plate antenna has an industrial application in the field of telecommunications where such an antenna can be manufactured and arranged within a radiofrequency device as described above.
  • the radio frequency device described can be integrated into any type of object communicating.
  • the radiofrequency device can be integrated into a smart phone worn on a person's belt to transmit via the antenna 100 a video stream to interactive glasses using an ultra broadband link between 7 GHz and 9 GHz.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP19219115.3A 2018-12-21 2019-12-20 Monopol-drahtplattenantenne für differentiellen anschluss Active EP3671955B1 (de)

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US10367259B2 (en) * 2017-01-12 2019-07-30 Arris Enterprises Llc Antenna with enhanced azimuth gain
JP7028212B2 (ja) * 2019-03-26 2022-03-02 株式会社Soken アンテナ装置
GB2601810B (en) * 2020-12-11 2023-07-05 Alpha Wireless Ltd High band antenna elements and a multi-band antenna
TW202406221A (zh) * 2022-04-19 2024-02-01 美商元平台技術有限公司 用於增強型跨身體鏈路的分佈式單極天線
US12021319B2 (en) * 2022-04-19 2024-06-25 Meta Platforms Technologies, Llc Distributed monopole antenna for enhanced cross-body link
KR20240016685A (ko) * 2022-07-29 2024-02-06 삼성전자주식회사 안테나 구조 및 이를 포함하는 전자 장치

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FR2709878A1 (fr) 1993-09-07 1995-03-17 Univ Limoges Antenne fil-plaque monopolaire.
WO2006135956A1 (en) * 2005-06-23 2006-12-28 Argus Technologies (Australia) Pty Ltd A resonant, dual-polarized patch antenna

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Publication number Priority date Publication date Assignee Title
FR2709878A1 (fr) 1993-09-07 1995-03-17 Univ Limoges Antenne fil-plaque monopolaire.
WO2006135956A1 (en) * 2005-06-23 2006-12-28 Argus Technologies (Australia) Pty Ltd A resonant, dual-polarized patch antenna

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Title
CH. DELAVEAUD ET AL., ELECTRONICS LETTERS, vol. 30, no. 1, 6 January 1994 (1994-01-06)
JING-YA DENG ET AL: "Broadband Patch Antennas Fed by Novel Tuned Loop", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 61, no. 4, 3 January 2013 (2013-01-03), pages 2290 - 2293, XP011499638, ISSN: 0018-926X, DOI: 10.1109/TAP.2012.2237497 *
JONG-HO JUNGIKMO PARK: "Electromagnetically Coupled Small Broadband Monopole Antenna", IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, vol. 2, 2003, pages 349 - 351, XP011433176, DOI: 10.1109/LAWP.2004.824171
P R FOSTERSOE MIN TUN: "Antennas and Propagation", 4 April 1995, CONFÉRENCE PUBLICATION NO. 407, article "A WIDEBAND BALUN FROM COAXIAL LINE TO TEM LINE"

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EP3671955B1 (de) 2024-02-21
FR3091045A1 (fr) 2020-06-26
FR3091045B1 (fr) 2020-12-11
US20200365994A1 (en) 2020-11-19

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