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
  • H01Q9/0414—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
  • 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
• • 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
  • H01Q5/378—Combination of fed elements with parasitic elements
• • 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

Definitions

• the invention relates to a flat antenna with wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of digital terrestrial and / or analog television type, comprising a reflector tuned to the low frequency of the passband and a radiator connected to a specific power supply and radiating at a frequency Pi, this radiator still having a slot tuned to a frequency F2.
• terrestrial television signals whether digital and / or analog, have a frequency of approximately between 470 and 870 MHz.
• this frequency band could not be covered through a single flat patch-type antenna.
• planar antenna of the patch type, it is known that consisting of a simple flat reflector made of conductive material, above which extends, separated by a dielectric substrate, a radiator in the form of a conductive plate whose dimensions are determined so that, under the effect of a specific power supply, it can radiate at a determined frequency. If the reflector has increased dimensions compared to the radiator, its function is to widen the bandwidth of the antenna downwards. More precisely, this reflector, through its coupling line with the radiator, is tuned to a low frequency, ie less than the radiation frequency of the radiator.
• a patch antenna has been produced, the radiator plate of which, supplied by a specific supply line, agrees with a first frequency, knowing that in this plate is cut a U-shaped slot of constant width which resonates at a different frequency.
• this slot antenna has the effect of widening the bandwidth.
• an antenna with a conductive layer and a dual-band transmission device including this antenna.
• This comprises a dielectric substrate comprising on its lower and upper faces a conductive layer, the first constituting a ground, the reflector and the second a patch, the radiator, the two being connected, here, by a short-circuit strip s extending over a wafer surface of the substrate.
• the antenna also comprises a coupling system comprising a primary coupling line formed by two slots extending parallel in the patch and constituting, respectively, two primary coupling slots, while a secondary coupling line formed by a third slot is connected to one of its two primary coupling slots.
• the patch also includes a separator assembly including at least one separator slot so as to reveal two zones constituting, respectively, a primary resonance zone and a secondary resonance zone.
• the separator assembly can be defined by a U-shaped separating slot, remaining at a distance from the edges of the patch and comprising two branches connected to each other. by a base.
• each of the separating slots constituting the U is the same, while the parallel extreme slots have a similar length.
• the coupling between, on the one hand, the standing wave of each of the two primary and secondary resonances and, on the other hand, the waves radiated in space is mainly done on a or more than one edge of the patch or separator slits or through these slits. It is specified that in the embodiment comprising a U-shaped separating slot the connecting slot constitutes an additional secondary radiative slot to the two other parallel slots.
• the present invention by challenging preconceived ideas in the matter, has been able to provide a solution to the aforementioned problem.
• the improvement in the bandwidth of a patch antenna through the present invention is significant since it makes it possible to obtain a broadening of this band of the order of 100% relative to the low frequency.
• the invention relates to a flat antenna with wide bandwidth, of the patch antenna type, in particular for the transmission and / or reception of UHF / SHF signals of digital terrestrial and / or analog television type, comprising a tuned reflector. at the low frequency of the passband and a radiator connected to a specific power supply and radiating at a frequency F1, this radiator still having a slot tuned to a frequency F2, characterized in that the radiator still has at least one other slot tuned at a frequency F3 different from the frequencies F1 and F2, these slots being connected by a defined connection slot capable of constituting a coupling line to ensure an electromagnetic current at each of the slots of frequency F2 and F3.
• the slots which connect the connection slot, defining a coupling line are geometrically identical, while the supply to the radiator takes place asymmetrically between the slots to ensure the radiation of the latter according to the frequencies, respectively, F2 and F3 different.
• these slots are defined with different dimensions to ensure their radiation according to different frequencies F2 and F3.
• the antenna comprises, placed above the radiator and parallel to the latter, at least one parasitic element with smaller dimensions for widening the pass band at the top of the band.
• the reflector has at least two of its opposite peripheral edges folded in a plane which is perpendicular to it in the direction of the radiator.
• the opposite folded peripheral edges are those crossing the plane of polarization of the radiator.
• these folded peripheral edges extend in planes which, relative to the corresponding edges of the radiator, are located at a smaller distance than that separating the plane of this radiator and that of the reflector.
• the advantages of the present invention consist in appreciably widening the bandwidth of a patch antenna, ie of the order of 100% of its low radiation frequency. Finally, this allows such a patch antenna to cover the entire range of frequencies corresponding, for example, to terrestrial television signals, whether digital or analog.
• FIG. 1 is a schematic representation in section along the electrical polarization plane (plane E) of a planar antenna without parasitic element, of the patch type according to the invention
• FIG. 2 is a schematic and plan view of the radiator
• FIG. 3 is a schematic representation, in plan view, of a planar antenna according to the invention, the radiator of which is surmounted by a parasitic element;
• FIG. 4 is a perspective representation of the antenna according to the invention.
• the present invention relates to a flat antenna with wide bandwidth for the transmission and / or reception of UHF and / or SHF signals, in particular digital terrestrial television signals and / or analog.
• This antenna 1 comprises a plane reflector 2 of metallic material above which extends a radiator 3, also metallic, connected to a specific power supply 4.
• a dielectric substrate separates the radiator 3 from the reflector 2 taking into account, in this regard, that the distance P between the latter is dependent on the permittivity of this substrate.
• the radiator 3 in the form of a single-sided printed circuit 3a on a dielectric substrate 3b whose permittivity ⁇ r is greater than al, it is possible to reduce the dimensions of the reflector 2 and, consequently, to obtain a smaller antenna.
• the dimensions of the latter can be further reduced by folding, in a plane perpendicular towards the radiator 3, at least two of the peripheral edges opposite 5, 6 of this reflector 2.
• the radiator 3 comprises at least two slots 7, 8 tuned to frequencies, respectively, F2 and F3 different from each other and with respect to the radiation frequency F1 of the radiator 3. Quite particularly, these slots 7, 8, extend parallel to the plane of polarization of the radiator 3. In this regard, the slots 7, 8 can be defined with different dimensions to ensure their radiation according to different frequencies F2 and F3.
• their radiation at different frequencies F2 and F3 results from an asymmetrical supply between said slots, knowing that the invention further extends to a solution combining both of these modes of production.
• connection slot 9 defined capable of constituting a coupling line.
• connection slot 9 plays the role of capacity to ensure this coupling line function which is assigned to it.
• a gain at the top of the band is also obtained by the superposition on the radiator 3 of at least one parasitic element 10, with dimensions smaller than the radiator 3 and extending, substantially, above the slots 7, 8.
• the latter define, at the level of the radiator 3, an electric polarization plane Pe and a magnetic polarization plane Pm which is perpendicular to it.
• the opposite peripheral edges 5, 6 of this reflector 2 which are folded at right angles to the radiator are those cut by this magnetic plane Pm.
• the radiator 3 is loaded by bringing the folded peripheral edges 5, 6 of the reflector 2 closer to the corresponding edges 11, 12 of this radiator 3 by a distance d less than the aforementioned distance P. This results in a lowering of the low radiation frequency of the antenna 1.
• this solution again contributes to a reduction in the size of the antenna 1 insofar as the dimensions of the latter are determined by those of the reflector 2 moreover tuned to the low frequency of the passband of said antenna 1.
• the present invention should be considered as a clear advance in the technical field under consideration, since this range of frequencies of television signals Digital and / or analog terrestrial could only be covered so far by the use of several patch type flat antennas.

Landscapes

• Waveguide Aerials (AREA)
• Aerials With Secondary Devices (AREA)
• Details Of Aerials (AREA)
• Support Of Aerials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29724989

Family Applications (1)

Country Status (8)

Families Citing this family (11)

Family Cites Families (5)

• 2002
  • 2002-06-28 FR FR0208113A patent/FR2841688B1/fr not_active Expired - Lifetime
• 2003
  • 2003-06-17 AT AT03761621T patent/ATE337628T1/de not_active IP Right Cessation
  • 2003-06-17 CN CNB038152878A patent/CN100449866C/zh not_active Expired - Fee Related
  • 2003-06-17 AU AU2003263244A patent/AU2003263244A1/en not_active Abandoned
  • 2003-06-17 EP EP03761621A patent/EP1518296B1/de not_active Expired - Lifetime
  • 2003-06-17 WO PCT/FR2003/001829 patent/WO2004004066A1/fr not_active Ceased
  • 2003-06-17 DE DE60307848T patent/DE60307848D1/de not_active Expired - Lifetime
  • 2003-06-17 US US10/516,375 patent/US7151491B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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