Apparatus for tuning the antenna of a miniature personal communications device

• US 4,817,196 A
• Filed: 03/13/1987
• Issued: 03/28/1989
• Est. Priority Date: 01/02/1987
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Irwin, James S., MacNak, Philip P.
• Primary Examiner(s): Blum, Theodore M.
• Assistant Examiner(s): Barron, Jr., Gilberto
• Application Number:
  US07/074,426
• Time in Patent Office: 746 Days
• Field of Search: 455/351, 455/344, 455/193, 455/154-158, 343/718
• US Class Current: 455/193.1
• CPC Class Codes: H01Q 1/27 Adaptation for use in or on movable bodies H01Q1/08, H01Q1/12, H01Q1/18 take precedence
• CPC Class Codes: H03J 3/14 Visual indication, e.g. magic eye

Abstract

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.

Claims

1. An antenna tuning arrangement for a portable communications device having a receiver for receiving transmitted signals, said arrangement comprising:

a wristband connected to the device for adapting the device to be worn on the body, said wristband including

antenna means for intercepting the transmitted signals,

antenna tuning means, coupled to said antenna means, for tuning said antenna means,

means for concealment of said antenna tuning means when tuning of said antenna means is not required;

receiver means, responsive to said antenna means, for receiving the transmitted signals, said receiver means deriving tuning signals in response to said antenna tuning means being adjusted when the transmitted signals are received; and

tuning indicator means responsive to the tuning signals, for providing a tuning indication corresponding to the tuning signals.

2. The antenna tuning arrangement according to claim 1 wherein said wristband with said antenna means, said antenna tuning means and said concealment means are removeable from the device.

3. The antenna tuning arrangement according to claim 1 wherein said tuning indicator means further comprises:

selector means coupled to said receiver means for controlling the selection of the tuning signals;

amplifier means, coupled to said selector means, for amplifying the tuning signals;

annunciator means; and

tuning detector means coupled to said amplifier means for detecting the magnitude of the amplified tuning signals, said tuning detector means further coupled to said annunciator means for providing an indication corresponding to the magnitude of the tuning signals.

4. The antenna tuning arrangement according to claim 3 wherein said annunciator means is visual.

5. The antenna tuning arrangement according to claim 4 wherein said visual annunciator means is a display.

6. The antenna tuning arrangement according to claim 5 wherein said display provides a graphic display corresponding to the magnitude of the tuning signals.

7. The antenna tuning arrangement according to claim 5 wherein said display provides a numeric indication corresponding to the magnitude of the tuning signals.

8. The antenna tuning arrangement according to claim 5 wherein said selector means further controls the supply of power to said tuning detector means.

9. The antenna tuning arrangement according to claim 8 wherein said selector means further comprising:

switch means;

signal isolation means coupled to said receiver means and to said tuning detector means for controlling the delivery of tuning signals; and

latch means responsive to said switch means and coupled to said signal isolation means for effecting the selection of the tuning signals and for controlling power to said tuning detector means.

16. The antenna tuning arrangement according to claim 1 wherein said tuning signal is derived from receiving an unmodulated frequency modulated (FM) carrier signal.

10. An antenna tuning arrangement for a wrist worn communications device having a receiver for receiving transmitted signals combined with a circuit for generating and displaying time, said arrangement comprising:

means for generating time and means for displaying the same;

a wristband connected to the device for adapting the device to be worn on the body said wristband including,

antenna means for intercepting the transmitted signals,

antenna tuning means, coupled to said antenna means, for tuning said antenna means, and

means for concealment of said antenna tuning means, when tuning of said antenna means is not required;

receiver means, responsive to said antenna means, for receiving the transmitted signals, said receiver means deriving tuning signals in response to said antenna tuning means being adjusted when the transmitted signals are received;

selector means coupled to said receiver means for controlling the selection of the tuning signals;

amplifier means, coupled to said tuning selector means, for amplifying the tuning signals; and

tuning detector means coupled to said amplifier means for detecting the magnitude of the amplified tuning signals, said tuning detector means further coupled to said display means for effecting the display of indicia indicating the magnitude of the tuning signals.

11. The antenna tuning arrangement according to claim 10 wherein the indicia displayed corresponding to the magnitude of the tuning signals is graphic and displayed independent of the time display.

12. The antenna tuning arrangement according to claim 10 wherein the indicia displayed corresponding to the magnitude of the tuning signals is numeric and displayed in place of the time display.

13. The antenna tuning arrangement according to claim 10 wherein said wristband with said antenna means, said antenna tuning means and said concealment means are removeable from the device.

14. The antenna tuning arrangement according to claim 10 wherein said selector means further controls the supply of power to said tuning detector means.

15. The antenna tuning arrangement according to claim 14 wherein said selector means further comprising:

switch means;

signal isolation means coupled to said receiver means and to said tuning detector means for controlling the delivery of tuning signals; and

latch means responsive to said switch means and coupled to said signal isolation means for effecting the selection of the tuning signals and for controlling power to said tuning detector means.

17. The antenna tuning arrangement according to claim 14 wherein the unmodulated carrier signal is an unmodulated frequency modulation (FM) signal.

18. The antenna tuning arrangement according to claim 10 wherein said tuning signal is derived from receiving an unmodulated frequency modulated (FM) carrier signal.

19. The antenna tuning arrangement according to claim 18 wherein the unmodulated carrier signal is an unmodulated frequency modulation (FM) signal.