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    3.
    发明专利
    未知

    公开(公告)号：AT88836T

    公开(公告)日：1993-05-15

    申请号：AT87901775

    申请日：1987-01-02

    Applicant: MOTOROLA INC

    Inventor： MACNAK PHILIP PAUL ,  IRWIN JAMES STUART

    IPC: H01Q1/44 ,  G04G99/00 ,  H01Q1/27 ,  H03H7/38 ,  H03J3/10 ,  H03J3/14 ,  H04B1/08 ,  H04Q7/14

    Abstract: PCT No. PCT/US87/00001 Sec. 371 Date Mar. 13, 1987 Sec. 102(e) Date Mar. 13, 1987 PCT Filed Jan. 2, 1987 PCT Pub. No. WO88/05213 PCT Pub. Date Jul. 14, 1988.An antenna tuning arrangement is provided for a miniature personal communications device which is normally worn on the body. The device includes a wristband having an antenna and antenna tuning elements which are normally concealed, to allow the antenna to be tuned while the device is being worn. A receiver in the communications device is coupled to the antenna and to a tuning indicator circuit which provides a tuning indication when the tuning element is adjusted without requiring entry into the device. The tuning indicator operation is selectable and draws no power when not selected.

    Automatic antenna tuning system for portable communication devices
    6.
    发明专利
    Automatic antenna tuning system for portable communication devices 未知

    公开(公告)号：HK9197A

    公开(公告)日：1997-01-31

    申请号：HK9197

    申请日：1997-01-23

    Applicant: MOTOROLA INC

    Inventor： MACNAK PHILIP PAUL ,  IRWIN JAMES STUART ,  DAVIS WALTER LEE

    IPC: H04L27/00 ,  H01Q1/27 ,  H03J7/02 ,  H04B1/18 ,  H04B7/26 ,  H04Q7/14 ,  H04Q7/38

    Abstract: PCT No. PCT/US87/00002 Sec. 371 Date Feb. 27, 1987 Sec. 102(e) Date Feb. 27, 1987 PCT Filed Jan. 2, 1987 PCT Pub. No. WO88/05214 PCT Pub. Date Jul. 14, 1988.An antenna tuning apparatus for a portable communications device which includes a means of adapting the device to be worn on the body is described. The device consists of an antenna, tuning means and a receiver for receiving transmitted signals including a tuning mode signal. A decoder initiates antenna tuning when the tuning mode signal is detected. A tuning controller enables a carrier detection circuit to determine the magnitude of the received signals, and generates a tuning control signal supplied to a D/A converter to effect tuning of the antenna by monitoring the variations in the magnitude of the received signals.

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