Helical antennas for multi-mode mobile phones

Abstract

The use of helical antennas in handsets for multi-frequency operation has been studied. It is shown that it is possible to obtain very wideband operation or two separate frequency bands of operation by using two helical antennas attached on the top edges of the conducting case of a handset. The presence of the second antenna has relatively small effect on the operation. If one of the single helical antennas is replaced with two helical antennas one within the other three separate frequency bands of operation can be obtained.