Browse Prior Art Database

HEL/TEL ANTENNA

IP.com Disclosure Number: IPCOM000006959D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-12
Document File: 1 page(s) / 56K

Publishing Venue

Motorola

Related People

James T Wiggenhorn: AUTHOR

Abstract

This invention is a combination helical and quarter metal (105) sleeves to-make a resonant element. This for wave telescopic antenna to be used on VHF and UHF example at UHF thequencies would be about three inches portable radios. in length.

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MOTOROLA INC. Technical Developments Volume 19 June 1993

HEL/TEL ANTENNA

by James T Wiggenhorn

   This invention is a combination helical and quarter metal (105) sleeves to-make a resonant element. This for wave telescopic antenna to be used on VHF and UHF example at UHF thequencies would be about three inches portable radios. in length.

  The antenna has the benefit of the helical with its When the telescopic member (101) is fully extended small size and when fully extended the radiation effi- as shown in Figure 2 the center loading coil (103) is ciency of a full size whip. Typically a helical antenna is 3 shorted by an internal metal member (104) with an over- to 6 DB down from a fullsize quarter wave whip. all length of about six inches.

  The structure is as shown in Figure 1. The antenna This design gives a user of a portable radio the bene- when in the collapsed position will utilize a loading coil tits of both types of antennas in one structure.
(103) in the center and conducting upper (102) and lower

118 0 Motorola. IX 1993

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