Abstract: A system of at least two units that transmit and/or receive a signal at a first or a second frequency, respectively, each of the units being individually connected to the antenna, which is common to a first branch and to a second branch, respectively. The first branch or the antenna includes first passive electronics preventing passage of the signal at the second frequency to the first unit and allowing passage of the signal at the first frequency to the antenna. The second branch or the antenna includes second passive electronics preventing passage of the signal at the first frequency to the second unit and allowing passage of the signal at the second frequency to the antenna.

Abstract: A system of at least two units that transmit and/or receive a signal at a first or a second frequency, respectively, each of the units being individually connected to the antenna, which is common to a first branch and to a second branch, respectively. The first branch or the antenna includes first passive electronics preventing passage of the signal at the second frequency to the first unit and allowing passage of the signal at the first frequency to the antenna. The second branch or the antenna includes second passive electronics preventing passage of the signal at the first frequency to the second unit and allowing passage of the signal at the second frequency to the antenna.

Abstract: A method for detecting and estimating an angle of rotation on itself, about a mounting axis, of a wheel unit with an acceleration sensor, the wheel unit being associated with a tire mounted on a rim, forming a wheel, the sensor detecting a gravitational force during the rotation of the wheel, forming a sinusoid. The wheel unit is mounted on the wheel with the acceleration sensor directly or indirectly inclined with respect to a plane tangential to the rim. The angle of rotation on itself of said wheel unit and therefore of the acceleration sensor at a given instant is estimated by comparing at least one parameter of the sinusoids that are obtained for the wheel unit in an initial mounting position on the wheel and in its position at this given instant, respectively.

Abstract: Method of determining the footprint of a tire on the ground, using devices already installed in standard production tires. Since the frequency of the transmitter clock present in a wheel unit is perturbed by mechanical vibrations when the tire contacts the ground, the frequency variations of the reference clock are representative of the value of the footprint. The method therefore includes determining the footprint on the ground of a tire of a wheel by measuring continuously, as a function of time, a signal representative of the variations in frequency of the reference clock supplied at the output of the time control device; determining a time interval during which the frequency variations of the reference clock occur; and, on the basis of the rotation speed of the tire, deducing therefrom an angular range of contact (?) corresponding to the footprint between the ends representing the ground contact length of the tire.

Abstract: A method for detecting and estimating an angle of rotation on itself, about a mounting axis, of a wheel unit with an acceleration sensor, the wheel unit being associated with a tire mounted on a rim, forming a wheel, the sensor detecting a gravitational force during the rotation of the wheel, forming a sinusoid. The wheel unit is mounted on the wheel with the acceleration sensor directly or indirectly inclined with respect to a plane tangential to the rim. The angle of rotation on itself of said wheel unit and therefore of the acceleration sensor at a given instant is estimated by comparing at least one parameter of the sinusoids that are obtained for the wheel unit in an initial mounting position on the wheel and in its position at this given instant, respectively.

Abstract: Method of determining the footprint of a tire on the ground, using devices already installed in standard production tires. Since the frequency of the transmitter clock present in a wheel unit is perturbed by mechanical vibrations when the tire contacts the ground, the frequency variations of the reference clock are representative of the value of the footprint. The method therefore includes determining the footprint on the ground of a tire of a wheel by measuring continuously, as a function of time, a signal representative of the variations in frequency of the reference clock supplied at the output of the time control device; determining a time interval during which the frequency variations of the reference clock occur; and, on the basis of the rotation speed of the tire, deducing therefrom an angular range of contact (?) corresponding to the footprint between the ends representing the ground contact length of the tire.

Abstract: An electronic unit for measuring operating parameters of a tire, the tire being mounted on a rim, the mounted assembly forming a vehicle wheel able to rotate about an axis of rolling, the electronic unit includes a support designed to be mounted on the wheel, the support forming a printed circuit on which there is mounted a radial-acceleration sensor able to measure radial accelerations of the wheel, the radial-acceleration sensor being mounted inclined in an angular range from 30 to 60 degrees with respect to a plane tangential to the rim.

Abstract: Method of determining the footprint of a tire on the ground, using devices already installed in standard production tires. Since the frequency of the transmitter clock present in a wheel unit is perturbed by mechanical vibrations when the tire contacts the ground, the frequency variations of the reference clock are representative of the value of the footprint. The method therefore includes determining the footprint on the ground of a tire of a wheel by measuring continuously, as a function of time, a signal representative of the variations in frequency of the reference clock supplied at the output of the time control device; determining a time interval during which the frequency variations of the reference clock occur; and, on the basis of the rotation speed of the tire, deducing therefrom an angular range of contact (?) corresponding to the footprint between the ends representing the ground contact length of the tire.

Abstract: An electronic unit for measuring operating parameters of a tyre, the tyre being mounted on a rim, the mounted assembly forming a vehicle wheel able to rotate about an axis of rolling, the electronic unit includes a support designed to be mounted on the wheel, the support forming a printed circuit on which there is mounted a radial-acceleration sensor able to measure radial accelerations of the wheel, the radial-acceleration sensor being mounted inclined in an angular range from 30 to 60 degrees with respect to a plane tangential to the rim.

Abstract: A radiofrequency transmission device (D?) includes: a transmission unit (10) for transmitting a voltage signal (S) in pulsed form; a radiofrequency antenna (A); filtering elements (30?); and a voltage source (Vcc), wherein the filtering elements (30?) include: “n” coils (B1, B2. . . Bn), electrically connected in series, of which (n?1) coils each have a natural resonance frequency such that: fRLi=i×fF each having an inductance (Li) such that, at the predetermined fundamental frequency: LTOT=L1+L2+ . . . Li+ . . . Ln=ZTOT=Z1+Z2+ . . . Zi+ . . . Zn and Li=Zi where fRLi Is the natural resonance frequency of the i-th coil i is a number varying from 2 to n, LTOT is the total inductance of the n coils, Li is the inductance of the i-th coil, ZTOT is the total impedance of the n coils, Zi is the impedance of the i-th coil, n is an integer greater than zero.

Abstract: A portable radio communication device D? with adjustable total gain and an associated gain adjustment method via a conductive metal frame C situated at the periphery of the portable device D?. For this purpose, the frame C includes several metal sections P1, P2, P3, P4 not connected to each other and separated from each other by openings F1, F2, F3, F4. Switching elements S1, S2, S3, S4 make it possible to electrically connect two consecutive sections in such a way as to modify the length of the sections and to modify the electromagnetic coupling between the antenna A and the metal frame C. The modification of coupling causes a modification of the value of the resultant gain Gr of the antenna A. A calibration step makes it possible to select the sections to be connected together in order to obtain the desired resultant gain Gr of the antenna A.

Abstract: A radiofrequency transmission device (D?) includes: a transmission unit (10) for transmitting a voltage signal (S) in pulsed form; a radiofrequency antenna (A); filtering elements (30?); and a voltage source (Vcc), wherein the filtering elements (30?) include: “n” coils (B1, B2. . . Bn), electrically connected in series, of which (n?1) coils each have a natural resonance frequency such that: fRLi=i×fF each having an inductance (Li) such that, at the predetermined fundamental frequency: LTOT=L1+L2+ . . . Li+ . . . Ln=ZTOT=Z1+Z2+ . . . Zi+ . . . Zn and Li=Zi where fRLi Is the natural resonance frequency of the i-th coil i is a number varying from 2 to n, LTOT is the total inductance of the n coils, Li is the inductance of the i-th coil, ZTOT is the total impedance of the n coils, Zi is the impedance of the i-th coil, n is an integer greater than zero.

Abstract: A radiofrequency transmission device (D?) includes: a transmission unit (10) for transmitting a voltage signal (S) in pulsed form; a radiofrequency antenna (A); filtering elements (30?); and a voltage source (Vcc), wherein the filtering elements (30?) include: “n” coils (B1, B2 . . . Bn), electrically connected in series, of which (n?1) coils each have a natural resonance frequency such that: fRLi=i×fF each having an inductance (Li) such that, at the predetermined fundamental frequency: LTOT=L1+L2+ . . . Li+ . . . Ln=ZTOT=Z1+Z2+ . . . Zi+ . . . Zn and Li=Zi where fRLi Is the natural resonance frequency of the i-th coil i is a number varying from 2 to n, LTOT is the total inductance of the n coils, Li is the inductance of the i-th coil, ZTOT is the total impedance of the n coils, Zi is the impedance of the i-th coil, n is an integer greater than zero.

Abstract: Method of determining the footprint of a tire on the ground, using devices already installed in standard production tires. Since the frequency of the transmitter clock present in a wheel unit is perturbed by mechanical vibrations when the tire contacts the ground, the frequency variations of the reference clock are representative of the value of the footprint. The method therefore includes determining the footprint on the ground of a tire of a wheel by measuring continuously, as a function of time, a signal representative of the variations in frequency of the reference clock supplied at the output of the time control device; determining a time interval during which the frequency variations of the reference clock occur; and, on the basis of the rotation speed of the tire, deducing therefrom an angular range of contact (?) corresponding to the footprint between the ends representing the ground contact length of the tire.

Abstract: A portable radio communication device D? with adjustable total gain and an associated gain adjustment method via a conductive metal frame C situated at the periphery of the portable device D?. For this purpose, the frame C includes several metal sections P1, P2, P3, P4 not connected to each other and separated from each other by openings F1, F2, F3, F4. Switching elements S1, S2, S3, S4 make it possible to electrically connect two consecutive sections in such a way as to modify the length of the sections and to modify the electromagnetic coupling between the antenna A and the metal frame C. The modification of coupling causes a modification of the value of the resultant gain Gr of the antenna A. A calibration step makes it possible to select the sections to be connected together in order to obtain the desired resultant gain Gr of the antenna A.