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    Antenna
    61.
    发明专利
    Antenna 未知

    公开(公告)号：GB2409109B

    公开(公告)日：2006-08-09

    申请号：GB0328922

    申请日：2003-12-13

    Applicant: MOTOROLA INC

    Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

    IPC: H01Q5/00 ,  H01Q1/36 ,  H01Q5/10 ,  H01Q5/357 ,  H01Q9/36

    Abstract: An antenna for use in a mobile radio communication device includes a conductive helical or spiral coil portion extending along an axis and, galvanically coupled to the coil portion, a conductive capacitive top load portion, wherein the coil portion and the top load portion are mutually arranged to provide an electrically resonant structure in a frequency band of operation of the device, wherein the coil portion has a first part and a second part and at least part of the top load portion extends outside or alongside the second part but not the first part of the coil portion, wherein the resonant structure has a plurality of electrical resonances at frequencies in a frequency band of operation of the device, and the first and second parts of the coil portion contribute to one of the resonances and the first part of the coil portion and the second portion contribute to another of the resonances.

    Wireless subscriber communication unit and antenna arrangement therefor
    64.
    发明专利
    Wireless subscriber communication unit and antenna arrangement therefor 未知

    公开(公告)号：GB2395843B

    公开(公告)日：2006-04-26

    申请号：GB0227929

    申请日：2002-11-29

    Applicant: MOTOROLA INC

    Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

    IPC: H01Q21/28 ,  H01Q1/24 ,  H01Q21/24 ,  H04B7/06

    Abstract: A wireless subscriber communication unit ( 200 ) comprises an antenna arrangement ( 202, 330, 430 ) for radiating and/or receiving electromagnetic signals. A transmitter ( 220 ) and/or a receiver ( 210 ) is/are operably coupled to the antenna arrangement ( 202, 330, 430 ), for transmitting/receiving a radio signal. An antenna arrangement comprises an internal antenna located within the wireless communication unit ( 200 ) and an external antenna located substantially outside of the wireless communication unit, such that both the internal antenna ( 330, 430 ) and the external antenna ( 202 ) co-operate on substantially the same electromagnetic signal. In this manner, by provision of both an internal and an external antenna the wireless subscriber communication unit is able to function adequately should an antenna become disconnected, malfunction, or its performance suffer from impedance mismatching. Preferably, the internal and external antennas can be configured to be orthogonal to one another, thereby providing the wireless subscriber unit with the ability to operate with a substantially circular or elliptical polarization.

    Dual frequency antenna for a mobile telephone
    66.
    发明专利
    Dual frequency antenna for a mobile telephone 未知

    公开(公告)号：GB2401248A

    公开(公告)日：2004-11-03

    申请号：GB0309952

    申请日：2003-04-30

    Applicant: MOTOROLA INC

    Inventor： GROSSMAN OVADIA ,  BEN-AYUN MOSHE ,  ROZENTAL MARK

    IPC: H01Q1/24 ,  H01Q5/00 ,  H01Q5/357 ,  H01Q9/30 ,  H01Q21/30

    Abstract: An antenna 1 comprises an elongate conducting radiator 7 and a feedline 5. The feedline is screened and has a signal conductor 5a and a screening conductor 5b. A conducting sleeve 9 surrounds both the radiator 7 and the feedline 5 at their junction. The conducting sleeve 9 may or may not be connected to the feedline screening conductor 5b. Region A forms an effective inductance and region B forms an effective capacitance; the sleeve 9 therefore constitutes an rf impedance. The antenna operates as a quarter wave monopole at one frequency band and a half wave dipole at a second band. The two frequency bands may be the GPS (global positioning system) frequency at 1575 MHz and a UHF communications band at 380 to 420 MHz. The antenna may be used in a mobile phone or similar device.

    A Cartesian loop RF transmitter with adaptive envelope modulation of the amplifier power supply voltage
    69.
    发明专利
    A Cartesian loop RF transmitter with adaptive envelope modulation of the amplifier power supply voltage 未知

    公开(公告)号：GB2466218A

    公开(公告)日：2010-06-16

    申请号：GB0822729

    申请日：2008-12-12

    Applicant: MOTOROLA INC

    Inventor： AYUN MOSHE BEN ,  GROSSMAN OVADIA ,  NIR SHAY ,  ROZENTAL MARK

    IPC: H03F1/02 ,  H03F1/32

    Abstract: The power supply voltage Vs for the power amplifier 126 in a radio transmitter is reduced until non-linearity is detected, thereby achieving optimal amplifier efficiency. The supply voltage controller 127 provides a reference signal to the regulator 111 which is the product of the RF signal envelope and a scaling factor from the nonlinearity detector 125. The scaling factor is reduced until nonlinearity occurs or the scaling factor reaches a minimum value. The nonlinearity detector 125 (figure 2) is coupled to the outputs of the Cartesian loop filters 116,118 and measures the ratio of power at an offset frequency to on-channel power. Efficiency is not reduced by VSWR changes.

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