Development of an AM/FM·Mobile Telephone Tri-band Antenna Using Double Sleeve Structure

Abstract

This paper describes the design of an AM/FM-cellular mobile telephone tri-band antenna using coils as loads, and a double sleeve. When we assume that the double sleeve is electrically equivalent to a circuit having a capacitor and a coaxial line connected in parallel, the calculated current distributions agree with the measured results. This shows that an antenna with a double sleeve has the characteristics of a good radiation pattern and voltage standing wave ratio.