• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    There is provided a slot-tunable, frequency-tunable planar antenna comprising: a resonant pad (31), a first dielectric layer, a ground plane (33) having a first slot (34a, 54a) for each linear polarization, a second dielectric layer, and a transmission line (36, 56) comprising, for each first slot, an end strand extending under the first slot. The antenna is tunable in frequency, for each linear polarization, thanks to the capacitive element (s) variable (s). The adaptation of the antenna varies, for each linear polarization, as a function of a bias voltage applied to the capacitive element (s) variable (s). The antenna comprises, for each linear polarization, at least one second slot (34b, 54b) extending along, and having at least one dimension different from, the first slot. The end of the transmission line extends under the first and second slots. The (at least one) second slot creates an extra resonance.
    公开号:FR3018958A1
    申请号:FR1452301
    申请日:2014-03-20
    公开日:2015-09-25
    发明作者:Yaakoub Taachouche；Mohamed Himdi
    申请人:Centre National de la Recherche Scientifique CNRS；Universite de Rennes 1；
    IPC主号:
    专利说明:

    [0001] A tunable frequency tunable antenna and slot fed, and satellite positioning receiver comprising such an antenna. FIELD OF THE INVENTION The field of the invention is that of antennas.
    [0002] More specifically, the invention relates to a planar antenna tunable frequency and slot fed. The invention has many applications, such as for example in a satellite positioning receiver, for receiving and processing signals from different satellite positioning systems (GNSS, for "Global Navigation Satellite System"). 2. TECHNOLOGICAL BACKGROUND Several countries have (or will soon be) satellite constellations dedicated to localization in the GNSS band (1.16 to 2.5 GHz). There are therefore different GNSS systems and we can cite: - the GPS system for the USA, - the GALILEO system for Europe, - the GLONASS system for Russia, - the COMPASS system for China, and - the IRNSS system for India.
    [0003] GPS, GALILEO, GLONASS and COMPASS systems use frequencies in the band 1,164 to 1,602 GHz. On the other hand, the IRNSS system uses frequencies in a band around 2.49 GHz. The frequency spectrum used by GNSS systems is very wide. Antennas must therefore be capable of efficiently capturing the signals of the different constellations in a band of 1.16 to 2.5 GHz (more than the octave), with a circular polarization and a directional radiation pattern. In the literature, there are often two types of antennas: - dual-band antennas, to cover two bands (one of 1.16 to 1.3 GHz and the other of 1.55 to 1.61 GHz (See, for example, WO 2007006773, entitled "Multiband antennas for satellite positioning system"), and broadband antennas, which generally cover the entire band of 1.16 to 1.61 GHz (see, for example, US Pat. The following article: "Zhang Hong-Lin, Xiu-Yin Zhang, Bin-Jie Hu," Compact Broadband Annular Ring Antenna for Global Navigation Satellite Systems, "Antennas Propagation and EM Theory (ISAPE), 2010 9th International Symposium on , vol., no., pp.189,192, Nov. 29 2010-Dec. 2, 2010) A disadvantage of these two known types of antennas is that they do not cover the band around 2.5 GHz. In other words, they do not cover the entire GNSS band (1.16 to 2.5 GHz).
    [0004] A third type of antenna is also known, namely narrow-band antennas but tunable over a wide frequency band. FIGS. 1A, 2A and 2B illustrate an example of an antenna of this third type, namely a frequency-tunable slot-fed planar antenna 1. FIG. 1A is a perspective view, FIG. 2A is a top view, and FIG. Figure 2B a sectional view. It is an association between a planar antenna (also called "slot antenna") powered by slot and two variable capacitive elements 7 (in this example, diodes with variable capacity, also called "varicaps diodes"). These make it possible to make the antenna tunable over a wide frequency band. The slot-fed planar antenna has a structure in which are superimposed successively: a resonant pad (also called a "patch") 1, a first dielectric layer 2 (for example air or a dielectric substrate), a ground plane 3 having a slot 4 (operating in a single linear polarization in this example), - a second dielectric layer 5 (for example air or a dielectric substrate), and - a transmission line 6 (also called "power line", even if the antenna is used in reception) including an end strand extending under the slot.
    [0005] In the particular embodiment illustrated, the first dielectric layer 2 is a layer of dielectric material of thickness t and of permittivity Cri, on the upper face of which is printed the resonant chip 1. The second dielectric layer 5 is a layer dielectric material of thickness h and permittivity cr2, on the upper face of which is printed the ground plane 3 (having the slot 6), and on the underside of which is printed the transmission line 6 (shown in dashed lines) ) and a continuous bias line (for bringing the bias voltage to the resonant chip 1 which itself is connected to the variable capacitive elements 7).
    [0006] Each variable capacitive element (varicap diode) 7 is connected between a radiating side of the resonant chip 1 and the ground plane 3. The adaptation of the antenna varies as a function of a bias voltage applied to the variable capacitive elements. FIG. 1B shows six curves illustrating the variation of the reflection coefficient S11 as a function of frequency, for different values of the bias voltage of the varicap diodes. Each curve corresponds to a distinct resonance and is obtained for one of the values of the bias voltage (OV, 4V, 8V, 12V, 16V and 22V). The adaptation of the antenna varies according to the bias voltage of the diode. The operating frequency of the antenna varies between 1.7 GHz and 2.4 GHz, for a bias voltage that varies between 0 and 22V. This antenna is tunable over a wide band of frequencies. A major disadvantage of this antenna is that this tunability over a wide frequency band requires the use of very high polarization voltage values, which exceed 20V. OBJECTIVES OF THE INVENTION The invention, in at least one embodiment, has the particular objective of overcoming these various disadvantages of the state of the art. More specifically, in at least one embodiment of the invention, one objective is to provide a slot-fed planar antenna that is tunable in frequency over a wide frequency band, while requiring a lower bias voltage than in current solutions, preferably less than 3V. Another objective of at least one embodiment of the invention is to provide such an antenna which covers the entire GNSS frequency band (including around 2.5 GHz), with a low bias voltage compatible with the voltages available on portable devices. Another objective of at least one embodiment of the invention is to provide such an antenna which, in the GNSS frequency band, makes it possible to select the reception band of a constellation by filtering the reception bands efficiently and naturally. other constellations. Another objective of at least one embodiment of the invention is to provide such an antenna which is inexpensive and compact. 4. DISCLOSURE OF THE INVENTION In a particular embodiment of the invention, there is provided a slot-tunable, frequency-tunable planar antenna having a structure in which a resonant pad, a first dielectric layer, is superimposed successively. a ground plane having a first slot for each linear polarization, a second dielectric layer, and a transmission line comprising, for each first slot, an end strand extending under said first slot, said antenna being tunable in frequency for each linear polarization, by means of at least one variable capacitive element connected between a radiating side of the resonant chip and the ground plane, the adaptation of said antenna varying, for each linear polarization, as a function of a bias voltage applied to said at least one variable capacitive element. The antenna comprises, for each linear polarization, at least one second slot extending along, and having at least one dimension different from, the first slot, said end portion of the transmission line extending under said first slot and said at least one second slot, said at least one second slot creating additional resonance. The general principle of the invention is therefore, for each linear polarization, to use not one but more slots (two or more) fed in series by the same end of the transmission line. Thus, while having a compact solution with an interaction between the slots (since they are fed in series), each additional slot (that is to say other than the first) creates another resonance. Compared with the known solution illustrated in FIG. 1B, the present solution makes it possible to increase the number of resonances with a limited range of variation of the bias voltage. Thus, in order to tune the antenna over a given frequency band, there is a need for a bias voltage varying in a lower range (for example OV at 5V, and preferentially OV at 3V) than in current solutions (OV at 22V, or more). According to a particular characteristic, for each linear polarization, said at least one second slot and said first slot are of the same shape. According to a particular characteristic, for each linear polarization, said at least one second slot and said first slot have parallel longitudinal axes. According to a particular characteristic, said bias voltage varies between OV and 5V. Thus, a low bias voltage is used which is compatible with the voltages available on portable devices. According to a particular characteristic, for a first value of the bias voltage, the antenna covers a first subband resulting from a resonance created by the first slot, and for a plurality of second successive values of the bias voltage, the antenna covers a plurality of second successive sub-bands distinct from the first sub-band and each resulting in a resonance created by said at least one second slot. Because not all subbands are covered by resonances resulting from the same slot, the antenna is tunable to a plurality of subbands with a small range of variation of the bias voltage. According to a particular characteristic, the first subband is around 2.5 GHz, and the plurality of second successive subbands form a band between 1.1 GHz and 1.6 GHz.
    [0007] Thus, the antenna covers (i.e., is tunable in) the entire GNSS frequency band (including around 2.5 GHz). In this GNSS frequency band, it allows to select a sub-band (i.e. the reception band of a constellation) by efficiently and naturally filtering the other sub-bands (i.e. the reception bands of the other constellations). According to a particular characteristic, the first value is OV, and the plurality of second successive values are between 1.5V and 3V. Thus, the proposed antenna requires a lower polarization voltage than in the current solutions. According to one particular embodiment, the resonant pellet is square in shape, with a side length lp equal to 55 mm ± 1 mm, and for each linear polarization: said first slit is rectangular in shape, with a length equal to 40 mm 1 mm and width W3 equal to 1 mm ± 0.1 mm; and - said at least one second slot is of rectangular shape, of length 12 equal to 30 mm ± 1 mm and width W2 equal to 2 mm ± 0.1 mm. In this particular implementation, the antenna is inexpensive, compact and tunable the entire GNSS frequency band (including around 2.5 GHz). In a first implementation, the antenna operates in a single linear polarization. In a second implementation, the antenna operates according to first and second orthogonal linear polarizations, the combination of which provides circular polarization, and the first slot and said at least one second slot for the first linear polarization are orthogonal to the first slot respectively and said at least one second slot for the second linear polarization. Thus, the antenna operates with a circular polarization, which corresponds to that currently used by satellite navigation systems (GNSS).
    [0008] In a particular embodiment of the invention, there is provided a satellite positioning receiver, for receiving and processing signals from different satellite positioning systems, this receiver comprising or cooperating with an antenna according to any one of embodiments above. 5. LIST OF FIGURES Other features and advantages of the invention will become apparent on reading the following description, given by way of indicative and nonlimiting example, and the appended drawings, in which: FIGS. 1A, 1B, 2A and 2B, already described in connection with the prior art, illustrate the structure and performance of an example of planar, slot-fed and frequency-tunable antenna according to the prior art; FIGS. 3A and 3B are top views respectively showing the structure and the dimensions of an antenna according to a first particular embodiment of the invention, operating in a single linear polarization; FIGS. 4A and 4B are sectional views respectively showing the structure and the dimensions of the antenna according to said first particular embodiment of the invention, operating in a single linear polarization; FIG. 5 is a view from above showing the structure of an antenna according to a second particular embodiment of the invention, operating in a circular polarization; FIG. 6 illustrates the performance of the planar antenna, slot fed and frequency tunable, in a particular implementation of said third particular embodiment of the invention; FIG. 7 illustrates various possible forms for the slots of the antennas according to the invention; FIG. 8 illustrates various possible forms for the resonant patch of the antennas according to the invention; and Figures 9 to 13 show the structure of an antenna according to a third particular embodiment of the invention, operating in a circular polarization. 6. DETAILED DESCRIPTION In all the figures of this document, identical elements are designated by the same numerical reference. In connection with FIGS. 3A, 3B, 4A and 4B, an antenna 30 according to a first particular embodiment of the invention, operating in a single linear polarization, is now presented.
    [0009] For the sake of simplification, the top views (Figures 3A and 3B) and sectional view (Figures 4A and 4B) are partial. Variable capacitive elements (for example, varicaps diodes) have not been shown, which make the antenna tunable over a wide frequency band. As in the technique of the prior art illustrated in FIG. 1A, the antenna 30 comprises, for example, a variable capacitive element (varicap diode) connected between each radiating side of the resonant chip and the ground plane. The antenna 30 has a structure in which are superimposed successively: a resonant pad (also called "patch") 31, a first dielectric layer 32 (for example air or a dielectric substrate), a plane of mass 33 having first and second slots 34a, 34b (operating in a single linear polarization in this example), - a second dielectric layer 35 (for example air or a dielectric substrate), and - a transmission line 36 comprising an end strand extending under the two slots 34a, 34h.
    [0010] In this example, the resonant pad 31 is square in shape. However, it is possible to use different forms of pellet, and in particular but not exclusively those illustrated in FIG. 8 ((a) square, (b) rectangular, (c) dipole, (d) circular, (e) elliptical, ( f) triangular, (g) disk sector, (h) circular ring, (i) ring sector).
    [0011] The second slot 34b extends along the first slot 34a. They differ by at least one dimension. In this example, the two slots 34a, 34b are of the same shape, namely rectangular, and have parallel longitudinal axes. However, it is possible to use other forms of slit, including but not limited to those shown in Figure 7 ((a) H, (b) dog bone, (c) bowtie, (d) hourglass).
    [0012] As indicated in FIGS. 3B and 4B, the antenna is defined by the following dimensions: for the resonant patch 31 of square shape, the length lp of the sides; for the first dielectric layer 32, thickness h2 and permittivity cr2; for the ground plane 33, the length of the sides; for the first slot 34a of rectangular shape, the length 13 and the width W3, as well as the abscissa x3 (corresponding to the point obtained by orthogonal projection along the longitudinal axis of the first slot) in a coordinate system centered on the lower corner left of the ground plane 33; for the second slot 34b of rectangular shape, the length 12 and the width W 2, as well as the abscissa x 2 (corresponding to the point obtained by orthogonal projection along the longitudinal axis of the second slot) in the aforementioned reference; for the second dielectric layer 35, thickness h1 and permittivity Cri; for the transmission line 36, the length l, the width wi, the ordinate yi in the aforementioned reference. In a particular embodiment, the antenna 30 has the following dimensions: 4 = 105 mm + 1 mm lp = 55 mm + 1 mm h1 - 0.8 mm + h2 - 6 mm + 0.5 mm 0.01 mm 12 - 30 mm + 1 mm 1122 - 2 mm + 0.1 mm 13- 40 mm + 1 mm 1123 - 1 0011 + 0.1 0011 1121 - 2 mm + 0.5 mm x 2 - 34.5 mm + 0.5 mm x 3 - 26 mm + 0.5mm li - 60 mm + 1 mm yi - 52.5 mm + 1 mm Now, with reference to FIG. 5, an antenna 50 according to a second particular embodiment of the invention, operating according to FIG. a circular polarization, resulting from the combination of two orthogonal linear polarizations.
    [0013] The antenna 50 comprises all the elements of the antenna 30 of FIGS. 3A, 3B, 4A and 4B (the transmission line 36 and the slots 34a, 34b being used for the one of the two orthogonal linear polarizations). The antenna 50 further comprises another transmission line 56 and two other slots 54a, 54b (orthogonal to the slots 34a, 34b) which are used for the other of the two orthogonal linear polarizations. An antenna 90 according to a third particular embodiment of the invention operating in a circular polarization is now presented in connection with FIGS. 9 to 13.
    [0014] As illustrated in FIGS. 9 and 10 (views in perspective and in section respectively), the antenna 90 has a structure in which are superimposed successively: a first dielectric substrate 91 (for example NELTEC NX9300) on the lower face of which is printed a resonant chip (patch) 92 (see FIG. 11), - a second dielectric substrate 93 (for example NELTEC NX9300) on the upper face of which is printed a ground plane 94 comprising two pairs of slots (95a, 95b) and (96a , 96b) (see Figure 12), and on the underside of which is printed a transmission line 97 (see Figure 13); a metal plate 98 forming a reflective plane (second ground plane). The antenna 90 comprises an air layer 99 (forming a dielectric layer) between the resonant chip 92 and the ground plane 94. For this, the first and second dielectric substrates 91, 93 are separated by first metal spacers 100 (for example 6 mm high). The second dielectric substrate 93 and the metal plate 98 are separated by second metal spacers 101. As illustrated in FIG. 11 (view of the lower face of the first dielectric substrate 91), the antennas also comprise varicap diodes 102 (or any other variable capacitive element) each connected between a radiating side of the resonant chip 92 (in the middle of each edge of the resonant chip 92) and the ground plane 93 (via the first metal spacers 100). The supply of the varicap diodes is done by the resonant chip 92. As illustrated in FIG. 12 (view of the upper face of the second dielectric substrate 93), the two slots 95a, 95b are of the same shape, namely rectangular, and possess parallel longitudinal axes. Similarly, the two slots 96a, 96b are of the same shape, namely rectangular, and have parallel longitudinal axes. Slots 95a, 95b are orthogonal to slots 96a, 96b. As illustrated in FIG. 13 (seen from the underside of the second dielectric substrate 93), the transmission line 97 includes a first end strand 97a extending under the pair of slots (95a, 95b) and a second strand end 97b extending under the pair of slots (96a, 96b). The antenna comprises a coupler 105 for combining the two orthogonal polarizations (in phase quadrature). The bias voltage of the varicap diodes 102 is for example sent by a port 103 and by the transmission line 97 (also used for the RF signals received by the antenna; alternatively, the bias voltage arrives on a separate port and is transmitted by a separate line). Then, it is routed to the resonant chip 92, via a bias circuit 104 (DC block) so as not to disturb the RF signals. The first metal spacers 100 allow a connection between the mass of the diodes to the mass of the slots.
    [0015] In a particular embodiment, the antenna 90 has the following dimensions (taking again the notations given above for the antenna 30): 4 = 105 mm + 1 mm lp = 55 mm + 1 mm h1 - 0.8 mm + h2 - 6 mm + 0.5 mm 0.01mm 12- 30 mm + 1 mm w2 - 2 mm + 0.1 0011 13 = 40 mm + 1 mm w3 = 1 11011 + 0.1 0011 1121 - 2 mm + 0.5mm x2 - 34.5mm + 0.5mm x3 - 26mm + li - 30mm + 1mm 0.5mm Figure 6 illustrates the performance of the planar, slot-fed, frequency-tunable antenna in a particular implementation said third particular embodiment of the invention (that of Figures 9 to 13).
    [0016] FIG. 6 shows five curves illustrating the variation of the reflection coefficient S11 as a function of the frequency, for different values of the bias voltage of the varicap diodes. Each curve corresponds to a distinct resonance and is obtained for one of the values of the bias voltage (1V, 1.7V, 2V, 3V and OV). The adaptation of the antenna varies according to the bias voltage of the diode. The operating frequency of the antenna varies between 1.1 GHz (for a bias voltage of 1.5V) and 2.5 GHz (for a bias voltage of OV). This antenna is tunable over a wide frequency band (the GNSS band), with a low bias voltage, ranging from 0 to 3V, which is compatible with the voltages available on portable devices. The consumption is extremely low since it is for example diodes varicaps polarized in reverse. The antennas are adapted to receive signals from different GNSS constellations, in a band from 1164 MHz to 2506 MHz (more than an octave), with a circular polarization and a directional radiation pattern.
    [0017] This solution therefore makes it possible to use a single antenna for the entire GNSS band which gathers all the satellite positioning systems, even the 2.5 GHz one, and in a selective manner. The proposed antenna has a bandwidth of about 50MHz (narrow band), tunable over a wider frequency band. The antenna thus differs from the competing solutions by: - coverage of the entire band dedicated to GNSS, even that of 2.5 GHz (IRNSS signals); a very low consumption with a bias voltage that does not exceed 3V; - the selection of the reception of a constellation by filtering efficiently and naturally the other bands of the other constellations. The dimensions of the two slots of the same pair (95a, 95b) or (96a, 96b) make it possible to optimize the resonant frequency of the antenna as a function of the bias voltage. The originality is to use (at least) two slots to create two resonances in the GNSS frequency band. These two resonances cover all the frequency bands used for satellite tracking applications.
    [0018] Thus, in the example of Figure 6, the operating principle of the antenna is to cover a band around 2.5 GHz with a bias voltage of OV, then a 1.1 GHz band at 1.6 GHz with a voltage polarization which varies between 1.5V and 3V. Operation in the 2.5 GHz band is provided by slots 95b, 96b, and slots 95a, 96a provide operation in the 1.1 to 1.6 GHz band. In the GNSS frequency band (including around 2.5 GHz), the antenna makes it possible to select a sub-band (i.e. the reception band of a constellation) by efficiently and naturally filtering the other subbands (ie the reception bands of the other constellations). In this way the antenna acts as a natural filter of unused frequency bands. The present invention also relates to a satellite positioning receiver (GNSS receiver), for receiving and processing signals from different satellite positioning systems, and comprising or cooperating with an antenna according to the technique described above and illustrated with different embodiments. It is clear that many other embodiments of the invention can be envisaged. In particular, other frequency bands can be envisaged than the GNSS band, such as for example: the GSM 900 band (the GSM 900 uses the band 880-915 MHz for sending the voice or data from the mobile and 925-960 MHz band for receiving information from the network); - the mobile telephony band (LTE + GSM + UMTS) covering the 1.71-2.17 GHz band; - the location or transfer of data by WIFI at 2.4 GHz; - the LTE band (4G) which covers the 2.5-2.7GHz band for high-speed mobile telephony; - discrete antennas for vehicles in the UHF band (the Ultra High Frequency (UHF) band is the band of the radio spectrum between 300 MHz and 3 000 MHz).
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A frequency-tunable, slot-fed planar antenna having a structure in which a resonant pad (31, 92) is superimposed successively, a first dielectric layer (32; 99), a ground plane (33; 94) having a first slot (34a, 54a, 95a, 96a) for each linear polarization, a second dielectric layer (35; 93), and a transmission line (36, 56; 97) comprising, for each first slot, an end strand extending under said first slot, said antenna being frequency tunable, for each linear polarization, by means of at least one variable capacitive element connected between a radiating side of the resonant pellet and the ground plane, the adaptation of said antenna varying for each linear polarization, as a function of a bias voltage applied to said at least one variable capacitive element, characterized in that it comprises, for each linear polarization e, at least one second slot (34b, 54b; 95b, 96b) extending along, and having at least one dimension different from, the first slot, said end strand of the transmission line extending under said first slot and said at least one second slot, said at least one second slot creating additional resonance.
    [0002]
    2. Antenna according to claim 1, characterized in that, for each linear polarization, said at least one second slot and said first slot are of the same shape.
    [0003]
    3. Antenna according to claim 2, characterized in that, for each linear polarization, said at least a second slot and said first slot have parallel longitudinal axes.
    [0004]
    4. Antenna according to any one of claims 1 to 3, characterized in that said bias voltage varies between OV and 5V.
    [0005]
    Antenna according to any one of claims 1 to 4, characterized in that, for a first value of the bias voltage, the antenna covers a first subband resulting from a resonance created by the first slot, and in that, for a plurality of second successive values of the bias voltage, the antenna covers a plurality of second successive subbands distinct from the first band and each resulting in a resonance created by said at least one second slot .
    [0006]
    6. Antenna according to claim 5, characterized in that the first subband is around 2.5 GHz, and in that the plurality of second successive subbands form a band between 1.1 GHz and 1.6 GHz.
    [0007]
    7. Antenna according to any one of claims 5 and 6, characterized in that the first value is OV, and in that the plurality of second successive values are between 1.5V and 3V.
    [0008]
    8. Antenna according to any one of claims 1 to 7, characterized in that the resonant pad is of square shape, of side length 11, equal to 55 mm ± 1 mm, and in that, for each linear polarization: said first slot (34a, 54a; 95a, 96a) is rectangular in shape, of length equal to 40mm ± 1mm and width w3 equal to 1mm ± 0.1mm; and said at least one second slot (34b, 54b; 95b, 96b) is of rectangular shape, of length 12 equal to 30mm ± 1mm and width w2 equal to 2mm ± 0.1mm.
    [0009]
    9. Antenna according to any one of claims 1 to 8, characterized in that it operates in a single linear polarization.
    [0010]
    10. Antenna according to any one of claims 1 to 8, characterized in that it operates according to first and second linear orthogonal polarizations, the combination of which provides a circular polarization, and in that the first slot and said at least one second slot for the first linear polarization are orthogonal respectively to the first slot and said at least one second slot for the second linear polarization.
    [0011]
    Satellite positioning receiver, for receiving and processing signals from different satellite positioning systems, characterized in that it comprises or cooperates with an antenna (30, 90) according to any one of claims 1 to 10.
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    同族专利:
    公开号 | 公开日
    US10454173B2|2019-10-22|
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    2018-03-28| PLFP| Fee payment|Year of fee payment: 5 |
    2019-03-29| PLFP| Fee payment|Year of fee payment: 6 |
    2020-12-18| ST| Notification of lapse|Effective date: 20201109 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452301A|FR3018958B1|2014-03-20|2014-03-20|A FREQUENCY TUNABLE PLANAR ANTENNA WITH SLOT FEED, AND SATELLITE POSITIONING RECEIVER COMPRISING SUCH ANTENNA.|FR1452301A| FR3018958B1|2014-03-20|2014-03-20|A FREQUENCY TUNABLE PLANAR ANTENNA WITH SLOT FEED, AND SATELLITE POSITIONING RECEIVER COMPRISING SUCH ANTENNA.|
    PCT/EP2015/055484| WO2015140127A1|2014-03-20|2015-03-17|Frequency-tunable planar antenna supplied with power via a slot, and satellite-based positioning receiver including such an antenna|
    EP15710485.2A| EP3120414A1|2014-03-20|2015-03-17|Frequency-tunable planar antenna supplied with power via a slot, and satellite-based positioning receiver including such an antenna|
    US15/127,579| US10454173B2|2014-03-20|2015-03-17|Frequency-tunable and slot-fed planar antenna, and satellite-based positioning receiver comprising such an antenna|
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