EP3235058A1 - Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuit - Google Patents
Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuitInfo
- Publication number
- EP3235058A1 EP3235058A1 EP15816167.9A EP15816167A EP3235058A1 EP 3235058 A1 EP3235058 A1 EP 3235058A1 EP 15816167 A EP15816167 A EP 15816167A EP 3235058 A1 EP3235058 A1 EP 3235058A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- slot
- antenna
- plate
- capacitive 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
Links
- 239000000523 sample Substances 0.000 title claims abstract description 43
- 239000000758 substrate Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 description 15
- 230000005855 radiation Effects 0.000 description 9
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/103—Resonant slot antennas with variable reactance for tuning the antenna
-
- 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
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/32—Vertical arrangement of element
- H01Q9/36—Vertical arrangement of element with top loading
Definitions
- Wire-plate antenna having a capacitive roof incorporating a slot between the supply probe and the short-circuit wire
- the invention relates to the field of a wire-plate antenna comprising a ground plane, at least one capacitive roof constituting a first part of the radiating element, a supply probe connected to the capacitive roof and intended to be connected to a generator, and at least one electrically conductive short-circuit wire connecting the capacitive roof and the ground plane and constituting a second part of the radiating element.
- the invention fits in a very general way in telecommunications systems, and more particularly the communicating objects in which radio frequency devices (circuits and / or antennas) are present.
- a particular area of application targeted, but not exclusive, relates to a device for geolocation of an object, in particular a vehicle, comprising at least one such antenna configured so as to be able to transmit to a remote server, via a communication system in particular GSM type, the different positions of said device through an association with a geolocation system including GPS type.
- a wire-plate antenna as defined above is a known structure, for example via US-A1 6750825. If such an antenna has vis-à-vis the antennas of the prior art the advantages of being relatively simple in its design and implementation, to have small dimensions compared to the wavelength of use, to be adaptable to a suitable gain, it remains that the frequency bandwidth is relatively narrow .
- the use of a slot in the capacitive roof with the same side of this slot the supply probe and the short-circuit wire to miniaturize a wire-plate antenna is a known technique.
- This technique allows the miniaturization of the antenna or, in other words, to reduce the resonant frequency of the antenna.
- the resonant frequency of the antennal structure decreases.
- the slot changes the antenna's equivalent capacity by increasing its value according to its length. This arrangement, however, does not allow a significant increase in bandwidth. In practice, it is likely to involve a reduction of this bandwidth.
- Another known structure is a multiband slotted wire-plate antenna.
- the slot is arranged on the capacitive roof over a large part of its periphery, near the peripheral edges, so as to separate the capacitive roof into two zones and thus create two distinct resonances.
- In one of these zones are arranged the connection points of the capacitive roof respectively to the supply probe and the short-circuit wire on the same side of the slot.
- These two resonances related to the two zones are used separately and each of them is a wire-plate resonance.
- This particular wire-plate antenna offers multi-band operation (multi-band antenna). However, the bandwidth still remains narrow. Indeed, this method does not bring the two resonances enough to use them together and thus broaden the bandwidth.
- Another known wide-band planar antenna is the so-called "Goubau" antenna.
- This antenna is an antenna in which the capacitive roof is delimited in 4 sectors via two secant slots.
- This antenna combines several resonance modes in order to obtain a broadband antenna, namely a first resonance of the wire-plate type, for example around 400 MHz, with a strong current on the short-circuit wires, a second monopoly resonance charged, for example around 720 MHz, with a strong current on the supply son and a third resonance due to the wire connecting the supply son and the son of short circuit between them, for example around 980MHz.
- This antenna makes it possible to obtain a very wide bandwidth. However, its construction is very complex. Object of the invention
- the object of the present invention is to provide a wire-plate antenna that overcomes the disadvantages listed above.
- an object of the invention is to provide such a wire-plate antenna having a simple and compact mechanical structure and to provide a very wide operating bandwidth.
- a wire-plate antenna comprising a ground plane, at least one capacitive roof, a supply probe connected to the capacitive roof and intended to be connected to a generator, and at least one electrically conductive wire of short circuit connecting the capacitive roof and the ground plane, said antenna wire plate being such that the capacitive roof comprises at least one slot constituted by an opening through the entire thickness of the capacitive roof so as to open on each of the two opposite faces capacitive roof and configured so that the point of connection between the capacitive roof and the supply probe and the connection point between the capacitive roof and the electrically conductive short-circuit wire are arranged on either side of the slot.
- the wire-plate antenna may not include any discrete component placed at the slot.
- the slot may be straight, meandering or divided into a plurality of interconnected sections to form an unbroken slot.
- the slot can be configured so that the ratio between its length and its width is greater than 5, or even greater than 1 0.
- the ground plane, the capacitive roof, the supply probe, the said at least one electrically conductive short element circuit and said at least one slot may in particular be parameterized so that the wire-plate antenna has a first wire-plate resonance mode and a second slot resonance mode respectively at first and second distinct resonance frequencies. said first and second resonant frequencies being adapted such that the wire-plate antenna has a single and continuous operating frequency bandwidth.
- the slot may be configured to have an equivalent electrical length equal to half the wavelength associated with said second resonant frequency of the wire-plate antenna, said slot being closed at its ends.
- the slot may alternatively be configured to have an equivalent electrical length equal to one quarter of the wavelength associated with said second resonant frequency of the wire-plate antenna, said slot being open at at least one of its ends while opening on one of the peripheral edges of the capacitive roof.
- the wire-plate antenna may comprise at least one other short-circuit electrically conductive wire whose connection point to the capacitive roof is located on the same or opposite side, with respect to the slot, as the connection point between the Capacitive roof and the feeding probe.
- the supply probe can start from a point of the ground plane and then divide to connect to the capacitive roof at several different connection points.
- the slot may form a non-zero angle, in particular between 45 ° and 90 °, with the direction connecting the connection point between the capacitive roof and the supply probe and the point of connection between the capacitive roof and the electrically conductive wire short circuit.
- a device for geolocation of an object in particular a vehicle, may comprise at least one such wire-plate antenna configured so as to transmit to a remote server, via a communication system, for example of the GSM type, the different positions. the device through an association with a geolocation system, for example GPS type.
- the invention also relates to an object including a geolocation device comprising an antenna as defined above.
- the invention also relates to a radiocommunication device comprising an antenna as defined above.
- Figures 1 to 3 are perspective views, from above and in cross section of a first embodiment of a wire-plate antenna according to the invention
- FIG. 4 represents, for the first embodiment, a curve C1 of the reflection coefficient of the antenna (in dB) as a function of frequency, an impedance matching level k being also represented to define the bandwidth of the antenna between two frequencies f1 and f2,
- FIG. 5 represents, for the first embodiment, a curve C2 illustrating the total efficiency (%) of the antenna on its adaptation band and a curve C3 illustrating the radiation efficiency (%) of the antenna on his adaptation tape,
- FIG. 6 represents the gain diagrams of an antenna according to the invention (respectively corresponding to the curves C4 to C6) at 3 different frequencies, respectively equal to 1200 MHz, 1 100 MHz and
- FIG. 7 represents a curve C7 of the reflection coefficient (in dB) as a function of the frequency for the first embodiment, a curve C8 of the reflection coefficient (in dB) as a function of the frequency for a wire-plate antenna of the prior art, identical to the first embodiment but devoid of slot, an impedance matching level k being illustrated to define the bandwidth of the antenna between frequencies f1 and f2,
- FIG. 8 shows curves C9 and C10, respectively, of the real impedance and the imaginary impedance of the antenna according to the invention as a function of the frequency for the first embodiment, and curves C1 1 and C12, respectively.
- the real impedance and the imaginary impedance as a function of the frequency for a wire-plate antenna of the prior art, identical to the first embodiment but devoid of a slot,
- FIG. 9 represents, for the first embodiment, the intensity of the surface currents at the resonance of the wire-plate type
- FIG. 10 represents, for the first embodiment, the intensity of the surface currents at the slot resonance
- FIG. 11 shows curves C13 and C14 respectively illustrating the real impedance and the imaginary impedance as a function of frequency for a wire-plate antenna comprising a slot but outside the scope of the invention
- FIG. 12 represents, for said wire-plate antenna comprising a slot but outside the scope of the invention, the intensity of the surface currents at the wire-plate resonance,
- FIG. 13 represents, for said wire-plate antenna comprising a slot but outside the scope of the invention, the intensity of the surface currents at the slot resonance,
- FIG. 14 is a view from above of a second embodiment of a wire-plate antenna according to the invention.
- FIG. 15 represents a curve C16 of the reflection coefficient (in dB) as a function of frequency for the second embodiment, a curve C15 of the reflection coefficient (in dB) as a function of the frequency for a wire-plate antenna of the prior art, identical in the second embodiment but devoid of slot, and an impedance matching level k defining the bandwidth of the antenna between frequencies f1 and f2,
- FIG. 1 represents, for the second embodiment, a curve C17 of the total efficiency (%) of the antenna on its adaptation band and a curve C18 of the radiation efficiency (%) of the antenna on his adaptation band,
- FIG. 17 shows the curves C19 and C20 respectively illustrating the real impedance and the imaginary impedance of the antenna as a function of the frequency for the second embodiment
- FIGS. 18 to 20 show, in top view, different possible configurations for the supply probe and for the short circuit wire (s) with respect to the slot,
- FIG. 21 represents an embodiment of a radiocommunication device according to the invention.
- FIG. 22 represents an embodiment of a device for geolocation of an object according to the invention.
- FIG. 1 generally relates to a wire-plate antenna 10 comprising a ground plane 1 1, at least one capacitive roof 12, a feed probe
- the capacitive roof 12 constitutes a first part of the radiating element and the electrically conductive short-circuit wire 14 constitutes a second part of the radiating element.
- the invention fits in a very general way in telecommunications systems, and more particularly the communicating objects in which radio frequency devices (circuits and / or antennas) are present.
- a particular area of application referred to, but not exclusive, relates to a device for geolocation of an object, in particular a vehicle, comprising at least one such slotted wire-plate antenna configured so as to transmit to a remote server via a communication system, for example of GSM type, the different positions of the device through an association with a geolocation system, for example GPS type.
- a communication system for example of GSM type
- GPS Global Positioning System
- GSM Global System for Mobile Communications
- the feed probe 13 may for example pass through the ground plane 1 1 for connection to a power source.
- an insulation with the ground plane 1 1 must be provided.
- the capacitive roof 12 delimits at least one slot 15 configured so that the connection point M1 between the capacitive roof 12 and the probe 13 and the connection point M2 between the capacitive roof 12 and the short-circuit electrically conductive wire 14 (connected to the ground plane 1 1) are arranged on either side of the slot 15.
- the slot 15 is constituted by an opening (or a light) passing through the entire thickness of the capacitive roof 12 so as to open on each of the two opposite faces of the capacitive roof 12.
- the slot 15 is arranged between the supply probe 13 and the electrically conductive short-circuit wire 14.
- the ground plane 1 1 directly impacts the bandwidth of the antenna according to the invention.
- the ground plane 11 may be small in relation to the operating wavelength of the wire-plate antenna 10. It may for example be constituted by the electronic card of a WIFI router integrating a pico-optical function. Cell type 3G or 4G on which one would place the antenna 10.
- the ground plane 1 1 can also be very large compared to the operating wavelength of the wire-plate antenna 10. It can for example to be a car roof or an airplane fuselage.
- the son required for the supply probe 13 and the short-circuit wire 14 of the antenna 10 can be made in different ways and can have different profiles (circular, polygonal, etc.). They may be for example simple metal cylinders, forming spacers between the roof 12 and the ground plane 1 1, which could be welded or screwed to the roof 12 of the antenna and to the ground plane 1 1 (in this case which relate to the short-circuit wire 14. They can also be printed on a dielectric substrate which would be placed perpendicularly between the ground plane January 1 and the roof 12 of the antenna 10. So according to a particular embodiment, the wire electrically short-circuit conductor 14 and the supply probe 13 are formed on the same substrate placed perpendicular to the ground plane 1 1 and the capacitive roof 12.
- the two son can be used as a mechanical support for the roof 12 of the antenna.
- Plastic spacers can also be used to provide this function.
- the positioning as well as the diameters of the wires of the feed probe 13 and the short-circuit 14 will have an impact on the resonant frequencies as well as on their adaptation.
- These two geometrical parameters are thus adjustment parameters of the slit wire-plate antenna 10 described in this document. They must be placed on each side of the slot 15.
- the supply probe 13 starts from a point of the ground plane 11 and then splits to connect to the capacitive roof 12 at several distinct connection points.
- FIGS. 1 to 3 A first embodiment of a slotted wire-plate antenna 10 according to the invention is shown in FIGS. 1 to 3 and a second embodiment of a wire-plate antenna 10 according to the invention is represented in FIG. 14.
- the slotted wire-plate antenna 10 allows a combination of the two resonance modes in order to significantly widen the operating bandwidth with respect to the same antenna devoid of such a slot 15, or conversely to reduce the dimensions and the mechanical complexity of the antenna for a given operating bandwidth.
- the combination of these two modes of operation allows a gain in bandwidth greater than 2 by keeping a stable radiation.
- the fact of placing a slot 15 between the feed probe 13 and the short-circuit wire 14 makes it possible to create a second resonance mode close to the first type of resonance mode. wire plate. These two resonance modes are combined in order to obtain a gain in bandwidth of the order of 3 (for the case of a slot 15 of closed form) compared to an identical conventional wire-plate antenna but devoid of such a slot 15.
- the slot 15 may for example form a non-zero angle, in particular between 45 ° and 90 °, with the direction connecting the connection point M1 between the capacitive roof 12 and the supply probe 13 and the connection point M2 between the capacitive roof 12 and the electrically conductive short-circuit wire 14.
- the slot 15 may be rectilinear, meandering or divided into several sections connected to each other to form a non-discontinuous slot, for example in the form of an H as illustrated in FIGS. 1 and 2.
- the slot 15 as such is not an essential factor, unlike its equivalent electrical length. In general, it may in particular be taken care to ensure that the ground plane 1 1, the capacitive roof 12, the feed probe 13, the electrically conductive short-circuit element 14 and the slot 15 are parameterized so that the wire-plate antenna 10 has the first wire-plate resonance mode and the second slot resonance mode respectively at first and second resonant frequencies f3, f4 distinct (visible in FIG. 8), these first and second resonant frequencies being adapted such that the wire-plate antenna 10 has a single and continuous operating frequency bandwidth.
- the first resonance frequency will be denoted f9 and the second resonance frequency will be marked as illustrated in FIG. 17.
- the various dimensional structural parameters of the slotted wire-plate antenna 10 are set so that the first operating frequency bandwidth associated with the first thread-plate resonance mode and the second operating frequency bandwidth associated with the second resonance mode of Slot overlap at least partially in the operating frequency spectrum of slotted wire-plate antenna 10.
- the wire-plate antenna 10 it will be taken care, during the design and design of the antenna 10, to ensure that the first and second resonant frequencies f3, f4 are not too far apart, for avoid any phenomenon of multi-band operation of the antenna which would correspond to an operation of the antenna 10 where it would be unusable at least partly between said first and second resonant frequencies, which is not sought.
- the at least partial overlap of the first and second bandwidths respectively associated with the first wire-plate resonance mode and the second slot resonance mode allows the wire-plate antenna 10 according to the invention to have a band. unique, continuous and very wide operating pass.
- This bandwidth gain is about 2 for the case of a slot open to at least one of its ends (ie - say that the slot opens on one side of the roof 12) and about 3 for the case of a slot 15 closed at its ends (the slot does not open on the sides of the roof 12).
- the slot 15 will preferably be configured so as to have an equivalent electrical length equal to half the length of the slot. wave associated with the second desired resonance frequency f4 of the wire-plate antenna 10, within 5%.
- the “equivalent electrical length”, also known as the "effective electrical length”, is a parameter that is fully known to the person skilled in the art, who is able to determine it by calculation or by simulation, based on the knowledge of the parameters. and dimensional dimensions of the slotted wire-plate antenna 10, such as the dimensions and the material of the capacitive roof 12, the dimensions and the shape of the slot 15, the dimensional and structural characteristics of each short-circuit wire 14 and the supply probe 13, the dimensional and structural characteristics of the ground plane 11, the relative distance separating each of these elements, the dimensional and structural characteristics of any dielectric material disposed between the ground plane 1 1 and the capacitive roof 12 ...
- the electrical length is the geometric length reduced to the wavelength.
- the slot 15 is configured so that the ratio between its length and its width is greater than 5, or even greater 10.
- the slot 15 has a length much greater than its width, this width being variable to control its equivalent electrical length.
- the antenna does not comprise a discrete component, active or passive, such as capacitive elements, placed along the slot 15.
- the antenna does not include a discrete component connected on either side of the slot .
- the design of the antenna is particularly simple and one can achieve double resonance, optimized characteristics, without the need to add additional components at the slot. This simplifies the sizing of the antenna.
- FIGS. 4 to 13 show various curves representative of the operation of the first embodiment as illustrated in FIGS. 1 to 3, for which the width L 1 of the roof 12 is 44 mm, the length L 2 of a half lateral branch of the H formed by the slot 15 is 18 mm, the length L3 of the main branch of the H formed by the slot 15 is 42 mm and the length L4 of the roof 12 is 56 mm.
- the slot 15 is, in this first embodiment, an H slot composed of two slots of 36 mm interconnected by a slot of 42 mm.
- the slot 15 has a constant width of 2 mm, this width of 2 mm being very much less than the aforementioned lengths.
- Capacitive roof 12 is a roof for example metal in which the slot 15 is arranged, here H-shaped for example, of closed form (the slot does not open on one side of the roof).
- the equivalent electric length of the slot is equal to half the wavelength associated with the second resonance frequency f4, to within 5%.
- On either side of the slot 15 are connected the short-circuit wire 14 at the point M2 and the wire corresponding to the feed probe 13 at the point M1, this probe 13 being connected directly to a line delivering a radiofrequency signal .
- Each short-circuit wire 14 is connected to the plane of mass 1 1 which can be finite or infinite and on which electronic components can be positioned.
- the capacitive roof 12 of the wire-plate antenna 10 can be made from a metal foil (for example tinned copper or any other metal having a very good conductivity close to that of copper).
- the capacitive roof 12 of the slotted wire-plate antenna 10 may, among other things, be a simple piece of metal in which the slit 15 is machined and / or cut to the desired dimensions and shapes. It can also, for example, be made in the manner of a printed circuit, that is to say printed on a dielectric substrate. In this case, the substrate used will allow the miniaturization of the slit wire-plate antenna 10 as a function of the value of its relative permittivity.
- the geometric adjustment parameters of the plate-like resonance antenna as described in the document US-A1 -6750825, as well as the dimensions, the shapes, and the positions of the slot 15, make it possible to adjust the frequencies of the resonance f3, f4 of the first and second resonance modes and their adaptation.
- the positioning and the diameter of the feed probe 13 and the short-circuit wires 14 are also adjustment parameters of the wire-plate antenna 10.
- the width of the slit 15 may be constant along its entire length or vary in defined areas. For example, decreasing the width of the slot 15 at its center (on the side of its point of symmetry for example) has the effect of lowering the second resonant frequency f4 clean.
- the electrically conductive short-circuit wire 14 is a rectangular parallelepiped of 7.7 * 3.6 * 21 mm 3 and the wire of the supply probe 13 is a rectangular parallelepiped of 1.5 * 2.7 * 21 mm 3 .
- the following table summarizes the essential characteristics of the first embodiment (right column) in comparison with the same wire-plate antenna but devoid of the slot 15 (left column):
- the frequency Fc (center frequency) is the average between the frequencies f1 and f2.
- the relative bandwidth expressed as a percentage is the ratio between the bandwidth expressed in MHz (corresponding to the difference between f2 and f1, defined below) and the frequency Fc.
- FIG. 4 represents, for the first embodiment, a curve C1 illustrating the reflection coefficient (in dB) as a function of the frequency, k illustrating the desired impedance matching level, for example equal here to -8 dB .
- the bandwidth of the slotted wire-plate antenna 10 is greater than 300 MHz (between the low frequency f1 equal to 922 MHz at point P1 on the curve and the high frequency f2 equal to 1225 MHz point P2 on the curve). It is possible to bring the two resonance frequencies f3, f4 closer to obtain a better level of adaptation. For this, it will be necessary to modify the electrical length of the slot 15 as well as the size of the capacitive roof 12. A new adaptation of the slotted wire-plate antenna 10 may then be necessary by modifying the positions of the points M1, M2 and the diameters of the probe supply 13 and each wire 14 present.
- the bandwidth is thus defined as the frequency bandwidth on which the reflection coefficient is below the threshold k, for example equal to -8 dB, depending on the desired level of adaptation.
- FIG. 5 represents, for the first embodiment, the curve C2 illustrating the total efficiency (%) of the antenna on its adaptation band and the curve C3 illustrating the radiation efficiency (%) of the antenna on his adaptation band. Excellent efficiency is observed over the entire bandwidth bounded by the frequencies f1 and f2, especially with a radiation efficiency> 70%.
- FIG. 6 represents the graphs of total gain (respectively corresponding to the curves C4 to C6) at 3 different frequencies, respectively equal to 1200 MHz, 1 100 MHz and 950 MHz, for the first embodiment.
- the ground plane 1 1 of the slotted wire-plate antenna 10 is considered infinite. These curves validate a radiation stability over the entire operating band f1-f2 of the slotted wire-plate antenna 10.
- FIG. 7 shows the curve C7 illustrating the reflection coefficient (in dB) as a function of the frequency for the first embodiment, the curve C8 illustrating the reflection coefficient (in dB) as a function of the frequency for a filament antenna.
- plate of the prior art identical to the first embodiment but devoid of the slot 15, a threshold k corresponding to the desired impedance matching level being shown.
- the curve C8 shows that in the absence of the slot 15, the same wire-plate antenna but devoid of the slot 15 has a low bandwidth, of the order 120 MHz, narrower than the bandwidth obtained in case of the presence of the slot 15.
- FIG. 8 shows curves C9 and C10 respectively illustrating the real impedance and the imaginary impedance of the antenna as a function of the frequency for the first embodiment, and curves C1 1 and C12 respectively illustrating the real impedance and the imaginary impedance as a function of the frequency for a wire-plate antenna of the prior art, identical to the first embodiment but devoid of slot 15.
- the frequencies resonant f3 and f4 previously expressed respectively around 650 MHz and 1 150 MHz.
- the second resonance peak at the frequency f4 allows the desired bandwidth gain, in particular via appropriate matching of the equivalent electrical length of the closed slot so that the resonance peaks join to increase the bandwidth.
- the curves C1 1 and C12 it is seen that the same wire-plate antenna but devoid of the slot 15 has a single resonance peak (around 825 MHz), therefore a much narrower bandwidth than in the context of the invention.
- FIG. 11 represents curves C13 and C14 respectively illustrating the real impedance and the imaginary impedance as a function of frequency for a wire-plate antenna comprising a slot dimensioned so as to be outside the scope of the invention.
- This slot has in particular an equivalent electrical length which is not dimensioned as before.
- the resonance frequency of the wire-plate resonance mode is spotted at around 753 MHz, while the resonance frequency of the slit resonance mode is spotted at around 1540 MHz.
- the frequencies f5 and f6 are therefore much farther apart from each other than the frequencies f3 and f4. It results while the two resonance modes are not combined as in the case of the wire-plate antenna 10 presented previously.
- Such an antenna has on the contrary a multi-band operation in which it is usable on two separate bandwidths and separated from one another but where it is unusable between these two bandwidths, which is not sought when the a wide and continuous bandwidth is desired.
- Figures 12 and 13 show, for this wire-plate antenna comprising a slit out of the field of the invention, the intensity of the surface currents respectively at the resonance of the wire-plate type and during the resonance slot.
- a strong current is seen on the structure at the short-circuit wire 14 and then a diffusion of this current throughout the capacitive roof 12 of the structure.
- This current distribution is typical of a plate-like resonance mode.
- f6 the frequency
- FIGS. 9 and 10 now show, for the first embodiment of the wire-plate antenna according to the invention, the intensity of the surface currents in the roof 12 respectively at the wire-plate resonance and at the resonance crack.
- FIGS. 9 and 10 show, for the first embodiment of the wire-plate antenna according to the invention, the intensity of the surface currents in the roof 12 respectively at the wire-plate resonance and at the resonance crack.
- the two resonances at the frequencies f3 and f4 are much closer to each other than in the case of the resonance peaks at the frequencies f5 and f6, it is difficult to completely dissociate the two resonances and thus to identify them as easily as before. This promotes an overlap of the bandwidths of the two resonance modes so as to provide a single and wide bandwidth, as well as stable far-field radiation.
- FIG. 14 is now a view from above of the second embodiment of a slotted wire-plate antenna 10 according to the invention, in which the slot 15 is open at at least one of its ends while opening on one of the peripheral edges of the capacitive roof 12.
- Figures 15 to 17 show different curves representative of the operation of the second embodiment as shown in Figure 14, for which the width L5 of the roof 12 is 44 mm, the length L6 of the single side branch of the slot 15 is 5 mm, the length L8 of the main branch of the slot 15 is 45 mm and the length L7 of the roof 12 is 56 mm.
- the slot 15 is configured so as to have an equivalent electrical length equal to one quarter of the wavelength associated with the second resonance frequency f of the desired wire-plate antenna 10 , within 5%.
- the first resonance frequency of the wire-plate antenna 10 is in this case that identified f9.
- the resonance frequencies f9, f are shown in FIG. 17.
- the single bandwidth is bounded by the f7 and f8 frequencies detailed below.
- FIG. 15 represents a curve C1 6 illustrating the reflection coefficient (in dB) as a function of the frequency for the second embodiment, a curve C15 illustrating the reflection coefficient (in dB) as a function of the frequency for a wire antenna -Plate of the prior art, identical to the second embodiment but devoid of slot 15, a threshold k corresponding to the desired impedance matching level being shown.
- the bandwidth of the slotted wire-plate antenna 10 (bounded by the frequencies f7 and f8) is of the order of 270 MHz, for an adaptation level of impedance of -8 dB (FIG. 15), the low frequency f7 being of the order of 905 MHz (point P3 on the curve) and the high frequency f8 being of the order of 1 177 MHz (point P4 on the curve) .
- This bandwidth therefore has a gain greater than 2 relative to the bandwidth of 122 MHz of the same antenna but devoid of the open slot: the curve C15 shows that in the absence of the open slot, the same Wire-plate antenna has a low bandwidth, only 122 MHz, significantly narrower than the bandwidth equal to 272 MHz (between the frequencies f7, f8) obtained in case of presence of the open slot.
- FIG. 1 represents, for the second embodiment, the curve C17 illustrating the total efficiency (%) of the antenna on its adaptation band and the curve C18 illustrating the radiation efficiency (%) of the antenna on his adaptation band. Excellent efficiency is observed over the entire bandwidth bounded by the frequencies f7 and f8, especially with a radiation efficiency> 70%.
- Fig. 17 shows the curves C19 and C20 respectively illustrating the actual impedance and the imaginary impedance versus frequency for the second embodiment.
- the frequencies f9 and f 10 expressed previously, corresponding to the first and second resonant frequencies, respectively around 687 MHz and 1 107 MHz.
- This second frequency f 10 precisely allows the gain in bandwidth, via including a suitable adaptation of the equivalent electrical length of the open slot 15.
- the second embodiment with open slot offers the same advantages as the first embodiment with a closed slot, namely to combine the two wire-plate and slot-type resonance modes in order to increase the operating bandwidth of the slot. an antenna without changing its dimensions or mechanical complexity.
- the first embodiment (closed slot) allows an increase in the bandwidth greater than that of the second embodiment.
- FIG. 18 diagrammatically shows in a view from above the distribution of the connection points M1 and M2 with respect to the slot 15 when the slotted wire-plate antenna 10 comprises only one feed probe 13 and only one electrically conductive short-circuit wire 14.
- the slotted wire-plate antenna 10 comprises at least one other electrically conductive short-circuit wire 14 whose connection point M2 to the capacitive roof 12 is located in the same direction. side, with respect to the slot 15, that the connection point M1 between the capacitive roof 12 and the supply probe 13.
- the wire-plate antenna 10 to slot may also include at least one other electrically conductive short-circuit wire 14 whose connection point M2 to the capacitive roof 12 is located on the same side, with respect to the slot 15, as the connection point M2 between the capacitive roof 12 and the first electrically conductive short-circuit wire 14, i.e.
- connection points M2 are disposed on the opposite side with respect to the slot 15, at the connection point M1 between the capacitive roof 12 and the supply probe 13. It remains possible for the wire-plate antenna 10 to also comprise at least one other short-circuit electrically conductive wire 14 whose connection point M2 to the capacitive roof 12 is situated on the opposite side, with respect to the slot 15, at the connection point M2 between the capacitive roof 12 and the first electrically conductive short-circuit wire 14.
- the invention also relates to a radiocommunication device 100 comprising an antenna 10 according to the invention, in particular an antenna wire-plate as described previously. One embodiment of such a device is shown in FIG.
- the device may comprise a module 10 for generating and / or analyzing electrical signals connected to or connected to the antenna 10.
- the invention also relates to a device 200 for geolocation of an object 300, in particular a vehicle 300, comprising at least one wire-plate antenna 10 previously described and configured to transmit to a remote server 210, via a communication system. 220, for example GSM type, the different positions of the device through an association with a geolocation system 230, for example GPS type.
- a communication system. 220 for example GSM type
- the object 300 including a geolocation device 200 comprising a geolocation system 230 and a wire-plate antenna according to the invention, in particular a wire-plate antenna as described above.
- the operating frequency bandwidth is preferably defined as the set of frequencies for which the reflection coefficient of the antenna is less than -8 dB.
- the capacitive roof is in one piece. Thus, preferably, no slot separates the roof in two separate parts or remote from each other.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1463018A FR3030909B1 (fr) | 2014-12-19 | 2014-12-19 | Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuit |
PCT/EP2015/080631 WO2016097362A1 (fr) | 2014-12-19 | 2015-12-18 | Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuit |
Publications (2)
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EP3235058A1 true EP3235058A1 (fr) | 2017-10-25 |
EP3235058B1 EP3235058B1 (fr) | 2020-05-27 |
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EP15816167.9A Active EP3235058B1 (fr) | 2014-12-19 | 2015-12-18 | Antenne fil-plaque ayant un toit capacitif incorporant une fente entre la sonde d'alimentation et le fil de court-circuit |
Country Status (4)
Country | Link |
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US (1) | US10547115B2 (fr) |
EP (1) | EP3235058B1 (fr) |
FR (1) | FR3030909B1 (fr) |
WO (1) | WO2016097362A1 (fr) |
Families Citing this family (5)
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CN108232441B (zh) * | 2017-12-29 | 2020-11-06 | 瑞声精密制造科技(常州)有限公司 | 一种天线单元及阵列天线 |
FR3085550B1 (fr) * | 2018-08-31 | 2021-05-14 | Commissariat Energie Atomique | Dispositif antennaire compact |
FR3090220B1 (fr) * | 2018-12-18 | 2021-01-15 | Commissariat Energie Atomique | Antenne fil-plaque monopolaire |
FR3108209B1 (fr) * | 2020-03-10 | 2022-02-25 | Commissariat Energie Atomique | Antenne fil-plaque monopolaire reconfigurable en fréquence |
FR3131463B1 (fr) | 2021-12-23 | 2024-04-26 | Commissariat Energie Atomique | Antenne fil plaque monopolaire à bande passante élargie |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4733245A (en) | 1986-06-23 | 1988-03-22 | Ball Corporation | Cavity-backed slot antenna |
FR2709878B1 (fr) | 1993-09-07 | 1995-11-24 | Univ Limoges | Antenne fil-plaque monopolaire. |
FR2822301B1 (fr) * | 2001-03-15 | 2004-06-04 | Cit Alcatel | Antenne a bande elargie pour appareils mobiles |
FR2826186B1 (fr) * | 2001-06-18 | 2003-10-10 | Centre Nat Rech Scient | Antenne mulitfonctions integrant des ensembles fil-plaque |
EP2273615A1 (fr) * | 2003-07-22 | 2011-01-12 | Psion Teklogix Inc. | Antenne interne avec fentes |
JP2007097115A (ja) * | 2005-02-25 | 2007-04-12 | Tdk Corp | パッチアンテナ |
WO2010142951A1 (fr) * | 2009-06-09 | 2010-12-16 | The Secretary Of State For Defence | Antenne compacte à bande ultra-large permettant l'émission et la réception d'ondes radio |
FR2958161B1 (fr) * | 2010-04-02 | 2012-04-27 | Oreal | Procede de traitement des cheveux mettant en oeuvre une emulsion directe comprenant un agent oxydant et une emulsion directe contenant un agent alcalin |
KR101898967B1 (ko) * | 2012-01-26 | 2018-09-14 | 삼성전자주식회사 | 고효율 광대역 안테나 |
-
2014
- 2014-12-19 FR FR1463018A patent/FR3030909B1/fr not_active Expired - Fee Related
-
2015
- 2015-12-18 WO PCT/EP2015/080631 patent/WO2016097362A1/fr active Application Filing
- 2015-12-18 EP EP15816167.9A patent/EP3235058B1/fr active Active
- 2015-12-18 US US15/536,265 patent/US10547115B2/en active Active
Also Published As
Publication number | Publication date |
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EP3235058B1 (fr) | 2020-05-27 |
FR3030909A1 (fr) | 2016-06-24 |
WO2016097362A1 (fr) | 2016-06-23 |
US20170352962A1 (en) | 2017-12-07 |
US10547115B2 (en) | 2020-01-28 |
FR3030909B1 (fr) | 2018-02-02 |
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