Browse Prior Art Database

RETRACTABLE PORTABLE ANTENNA

IP.com Disclosure Number: IPCOM000006064D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Nov-29
Document File: 1 page(s) / 58K

Publishing Venue

Motorola

Related People

Casey Hill: AUTHOR

Abstract

Portable radio users consistently complain of the discomfort from the use, at the side level, of rigid portable antennas presently available (such as the coaxial dipole). Using smaller, more comfortable antennas (such as the quarterwave whip) decreases the discomfort but results in much higher degradation losses at the side level. This publication proposes a retractable portable antenna which may solve both the discomfort and body loss problems.

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M MOTOROLA INC. Technical Developments Volume 12 April 1991

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RETRACTABLE PORTABLE ANTENNA

by Casey Hill

  Portable radio users consistently complain of the discomfort from the use, at the side level, of rigid portable antennas presently available (such as the coaxial dipole). Using smaller, more comfortable antennas (such as the quarterwave whip) decreases the discomfort but results in much higher degradation losses at the side level. This publication proposes a retractable portable antenna which may solve both the discomfort and body loss problems.

  The retractable portable antenna proposed acts as a vertical radiator at the head level and a loop antenna at the side level using a technique similar to that of a typical mechanically retractable "tape-measure" ruler found in most hardware stores. At the head level, the retractable portable antenna can be extended manually to full length (for example purposes we will assume a vertical end-fed halfwave). The vertical antenna has been shown to be a good radiator for head level use. When returning the radio to the side level, a mechanical button is pushed to retract the "tape" antenna into the portable radio case using a spring mechanism inside the radio case which is similar to that found in the typical "tape-measure" ruler. Once

retracted, the "tape" antenna forms a loop which has been shown to be a good antenna for side level operation. The loop must be perpendicular to the human body which may necessitate the use of...