Dual-Band Dual-Mode Printed Bow-Tie Antennas Integrated in Handheld Terminals for Wireless Communications

Abstract

The rapid increase in the use of dual-band dual-mode handsets worldwide has aroused the needfor more compact terminals. Although the monopole has demonstrated to endorse large specific absorption rate (SAR) values, manufacturers still rely on it as the handset antenna for new dual-mode terminals, with some commercial devices even exhibiting a dual-monopole configuration. This extension to higherfrequencies for the new, generation ofcellular systems can lead to increased electromagnetic absorption in the human body, making the new mobile communications equipment an issue ofpublic health concern. In this paper, several attempts to accomplish dual-band GSA/DCS 1800 operation on a single terminal are described While keeping similar radiation characteristics, a tremendous SAR reduction has been obtained by using printed bow-tie antennas compared to the ½-wavelength monopole.

Design of a Compact Dual-Band Antenna for Mobile Communications Handsets

“…The techniques employed included a spur-line filter embedded in the perimeter of a bow-tie antenna [9], [10], in order to achieve a dual frequency operation without incrementing the overall size of the patch. The same technique has now been applied to the design of a planar, dual band PIFA.…”

Tunable dual-band printed tab monopole antennas for wireless communications

“…THE DUAL-BAND ANTENNA SCHEME Several printed dual-band antenna have been previously developed at Universidad Politécnica de Cartagena and other research units. The techniques employed included a spur-line filter in the perimeter [1][2][3][4], in order to achieve a dual frequency operation without incrementing the overall size of the patch. The same technique has now been applied to the design of dual band printed monopole antenna.…”