Motorola Corporation

William W Tan

Gary L Pace

Robert Kurcbart

Pha C Nguyen

Silvia M Viteri

Pamela A Rakolta

A non-contact pager programming system includes a controller (30) which is responsive to command and data signals to generate first signals (34) including command and data words to govern a transmitting circuit (36) to transmit over the air a programming signal (46) digitally modulated in accordance with a reception protocol. The programming system may also include a receiving circuit (42) which is governed by at least one second signal (40) generated by the controller to receive over-the-air signals (52) generated by the pager being programmed in response to the programming signal.

Non-contact pager programming system and a pager for use therewith

A reactance buffer maintains a substantially constant reasonant frequency for an adjustable size loop antenna having first and second antenna segments. Each segment has first and second ends, the first ends being coupled to a receiver, and the second ends providing loop size adjustment. The reactance buffer comprises a reactance buffer input coupled to the second end of the first antenna segment. A plurality of taps are linearly disposed along a longitudinal axis of the first wristband section, and has a predetermined length between the outermost taps corresponding to the loop antenna size adjustment required. The taps provide selectable reactance buffer outputs for coupling to the second end of the second antenna segment. A plurality of reactance elements are arranged non-serially and couple the reactance buffer input to each of the plurality of taps and provide a substantially constant reactance measured between the reactance buffer input and each of the plurality of taps.

Reactance buffered loop antenna and method for making the same

The antenna system of the present invention includes a single loop antenna connected in series with a ferrite core loop antenna. The single loop antenna is enclosed in a nonconductive housing, such as a band, which surrounds the wrist. The single loop antenna has a first end grounded and is connected in series with a first variable capacitive element for adjusting the resonant frequency of the single loop antenna. The ferrite core loop antenna is connected to a second variable capacitive element for adjusting the resonant frequency of the ferrite core loop antenna. One end of the ferrite core loop antenna is applied as an input to a communication receiver such as a paging receiver. The outstanding feature of the antenna system is that the axis of the single loop antenna is perpendicular to and noncoplanar with the ferrite core loop axis for enhancing the sensitivity and minimizing body effects caused by hand movements.

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Lake Worth, FL, United States of America

William W Tan