Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
  • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
  • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
  • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
• • 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
  • H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/48—Earthing means; Earth screens; Counterpoises
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
  • H01Q5/30—Arrangements for providing operation on different wavebands
  • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
  • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
  • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
  • H01Q5/364—Creating multiple current paths
  • H01Q5/371—Branching current paths
• • 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
  • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

• Antenna consisting of at least two radiating strands and a ground plane.
• the present invention relates to an antenna for use in mobile telecommunication devices.
• the new 3GPP LTE telecommunication standard also called 4G
• 4G opens up a large number of sub-frequency bands in which telecommunication devices must transmit and / or receive signals.
• the sub-frequency bands are between 700MHz and 2700MHz.
• the frequency sub-band 700 to 800 MHz, the frequency sub-band 824 at 960 MHz, and the sub-frequency bands between 1710 MHz and 2700 MHz are examples.
• the antenna or antennas of the portable telecommunication devices must be able to transmit and / or receive electromagnetic signals in these sub-frequency bands.
• the lower sub-frequency bands impose antennae of large size while the miniaturization of portable telecommunications devices imposes imperatives of reduced size to the antennas.
• the present invention aims to solve these various constraints by providing an antenna that is able to radiate and / or convert electromagnetic waves in a broad frequency spectrum while being of a small footprint.
• the invention proposes an antenna consisting of at least two radiating strands and a ground plane, characterized in that a first strand is placed facing the ground plane in such a way that to create a first resonant cavity, a second strand is folded a plurality of times to create at least one U-shape forming at least a second resonant cavity and that the resonant cavities are coupled to each other.
• the antenna is able to radiate and / or convert electromagnetic waves in a broad frequency spectrum while being of a small footprint.
• the combination of the strands, the resonant cavities and the strong coupling between the resonant cavities allows the antenna to cover a much higher frequency band than that obtained by coupling a conventional antenna with a parasitic element or with another antenna while by being of small size.
• the combination of the strands, the resonant cavities and the strong coupling between the resonant cavities gives the antenna a very good adaptation stability when the radiating elements are subjected to an environment of proximity different from the free space, such as a finger or a head or near metal elements.
• the antenna according to the present invention is adapted to be embedded in any small object, such as a mobile phone, a PDA, a USB key, a tablet, a laptop operating near human bodies.
• the antenna according to the present invention is insensitive to the resizing of the ground plane or the implantation of new shielding.
• the distance between the first strand and the ground plane is between ⁇ / 10 and ⁇ / 30 and the opening of the second cavity has a width of between ⁇ / 10 and ⁇ / 300 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the resonant cavities are distant from each other by ⁇ / 10 to ⁇ / 30.
• the first and second strands are coplanar with the ground plane or with an element of the ground plane.
• the first strand is parallel to one of the edges of the ground plane or to the element of the ground plane.
• the second strand is folded to form several U-shaped shapes.
• the antenna consists of three radiating strands, the third strand is folded several times so as to create at least one U-shape forming at least one third resonant cavity.
• the dimension of the first strand and the distance of the first strand with respect to the ground plane are adapted for electromagnetic waves emitted and / or received having the shortest wavelengths.
• the dimension and the pleats of the second strand are adapted at least for the electromagnetic waves emitted and / or received having the longest wavelengths.
• FIG. 1 shows a first embodiment of an antenna according to the present invention
• FIG. 2 shows a second embodiment of an antenna according to the present invention
• FIG. 3 shows a third embodiment of an antenna according to the present invention
• FIG. 4 shows a fourth embodiment of an antenna according to the present invention
• FIG. 5 shows a fifth embodiment of an antenna according to the present invention.
• Fig. 1 shows a first embodiment of an antenna according to the present invention.
• the antenna consists of two radiating strands 12 and 13 connected via a connection 11 to a demodulator modulator, not shown in FIG. Fig. 1, which generates the electrical signals that the antenna must transmit and which processes the radio signals received by the antenna.
• the strands 12 and 13 are for example coplanar with the ground plane 10.
• the demodulator modulator is connected to a ground plane 10.
• the ground plane 10 is for example a circuit or a metal case.
• the strand 13 is parallel to one of the sides of the ground plane 10 so as to create a first resonant cavity 15.
• Strand 12 is folded several times to create a U shape forming a second resonant cavity 14.
• the coupling 16 between the resonant cavities 14 and 15 makes it possible to obtain a wide range of operation of the antenna.
• the distance between the strand 13 and the ground plane 10 is between ⁇ / 10 and ⁇ / 30 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the opening d of the resonant cavity 14 has a width of between ⁇ / 10 and ⁇ / 300 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the resonant cavities 14 and 15 are spaced from each other by ⁇ / 10 at ⁇ / 30.
• the antenna is capable of operating in frequency ranges such as 824-960MHz and 1710-2700MHZ or higher, or 700-824MHz and 1710-2700MHz or the frequency band used for WIFI at 5GHz.
• the dimensions and shapes of the strands 12 and 13 are determined so as to achieve a strong capacitive coupling between the resonant cavities 14 and 15.
• the location of the cavities 14 and 15, the location of the zones of strong coupling present at the opening d of each cavity 14 and 15 and the location of the coupling zone 16 as well as the minimum distance between these different zones, depend on the frequencies of desired resonances for the elements of the antenna. These locations depend on the distribution of currents at the frequencies considered. Indeed, for each of the cavities 14 and 15 coupled to each other, a most balanced current distribution is obtained in order to at least double the width of the high subband covered, for example del710-2700 MHz, by one of the strands. This effect can be considered analogous to that used by some broadband antenna arrays, without inducing a directivity of the radiation pattern, or that obtained by a broadband antenna of large size compared to the antenna described here.
• the current distributions on the strands are dependent on the structure of the antenna and the ground plane 10.
• Fig. 2 shows a second embodiment of an antenna according to the present invention.
• the antenna consists of two radiating strands 22 and 23 connected via a connection 21 to a demodulator modulator.
• the strands 22 and 23 are for example coplanar with the ground plane 20.
• the demodulator modulator is connected to a ground plane 20.
• the ground plane 20 is for example a circuit or a metal case.
• the strand 23 is parallel to one of the sides of the ground plane 20 so as to create a first resonant cavity 25.
• Strand 22 is folded a number of times to create a plurality of successive U-shapes. Each U contributes to the formation of a resonant cavity.
• the set of resonant cavities is noted 24 in FIG. 2.
• the coupling 26 between the resonant cavities 24 and 25 makes it possible to obtain a wide range of operation of the antenna.
• the distance between the strand 23 and the ground plane 20 is between ⁇ / 10 and ⁇ / 30 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the openings of the resonant cavities formed by the U have a width of between ⁇ / 10 and ⁇ / 300. It should be noted here that the openings may have different values relative to each other.
• the resonant cavities 24 and 25 are distant from each other from ⁇ / 4 to ⁇ / 30,
• Fig. 3 shows a third embodiment of an antenna according to the present invention.
• the antenna consists of three radiating strands 32, 33 and 38 connected via a connection 31 to a demodulator.
• the strands 32, 33 and 34 are for example coplanar with the ground plane 30.
• the demodulator modulator is connected to a ground plane 30.
• the ground plane 30 is for example a circuit or a metal case.
• the strand 33 is parallel to one of the sides of the ground plane 20 so as to create a first resonant cavity 35.
• Strand 32 is folded a number of times to create a plurality of successive U-shapes. Each U contributes to the formation of a resonant cavity.
• the set of resonant cavities is noted 34 in FIG. 3.
• the coupling 36 between the resonant cavities 34 and 35 makes it possible to obtain a wide range of operation of the antenna.
• the distance between the strand 33 and the ground plane 30 is between ⁇ / 10 and ⁇ / 300 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the strand 38 is folded several times to create at least one U-shape forming at least one other resonant cavity that is only weakly or not coupled to the other resonant cavities.
• the openings of the resonant cavities formed by the U have a width of between ⁇ / 10 and ⁇ / 300. It should be noted here that the openings may have different values relative to each other.
• Fig. 4 shows a fourth embodiment of an antenna according to the present invention.
• the elements denoted 40 to 46 in FIG. 4 are identical to the elements 20 to 26 in FIG. 2.
• the antenna of FIG. 4 is identical to the antenna as described with reference to FIG. 2 with the only difference that the angle of inclination of the strand 23 in FIG. 2, and noted 43 in FIG. 4, makes it possible to vary the characteristics of the cavity between the ground plane 10 and the strand 43 as well as the coupling 46 between the two cavities 45 and 46.
• This angle is for example between 0 and 20 degrees.
• Fig. 5 shows a fifth embodiment of an antenna according to the present invention.
• the antenna consists of two radiating strands 52 and 53 connected via a connection 51 to a demodulator modulator.
• the strands 22 and 23 are for example coplanar with the ground plane 50 and with an element 59 of the ground plane 50 or are for example coplanar with the element 59 of the ground plane 50.
• the demodulator modulator is connected to a ground plane 50 and to the element 59 of the ground plane 50.
• the ground plane 50 is for example a circuit or a metal case.
• the strand 53 is parallel to the element 59 of the ground plane 50, the ground plane 50 being or not parallel to the element 59.
• the strand 53 is parallel to the element 59 of the ground plane 50 so as to create a first resonant cavity 55.
• Strand 52 is folded a number of times to create a plurality of successive U-shapes. Each U contributes to the formation of a resonant cavity.
• the set of resonant cavities is noted 54 in FIG. 5.
• the coupling 56 between the resonant cavities 54 and 55 makes it possible to obtain a wide range of operation of the antenna.
• the distance between the strand 53 and the ground plane 50 is between ⁇ / 10 and ⁇ / 30 where ⁇ is the greatest length of the electromagnetic waves emitted and / or received by the antenna.
• the openings of the resonant cavities formed by the U have a width of between ⁇ / 10 and ⁇ / 300. It should be noted here that the openings may have different values relative to each other.
• the resonant cavities 54 and 55 are spaced from each other from ⁇ / 4 to ⁇ / 30.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Support Of Aerials (AREA)
• Waveguide Aerials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=48856776

Family Applications (1)

Country Status (4)

Citations (2)

Family Cites Families (7)

• 2013
  • 2013-03-20 FR FR1352499A patent/FR3003698B1/fr active Active
• 2014
  • 2014-03-17 WO PCT/EP2014/055308 patent/WO2014147027A1/fr active Application Filing
  • 2014-03-17 US US14/778,319 patent/US20160064824A1/en not_active Abandoned
  • 2014-03-17 EP EP14710319.6A patent/EP2976805A1/de not_active Withdrawn

Patent Citations (2)

Also Published As

Similar Documents

Legal Events