The Design of Multi-Band Antenna using a Backed Microstrip Line

Wireless communications have been developed widely and rapidly in the modern world, which leads to a great demand in designing compact, low-profile, and multiband antennas. To meet these requirements, compact high-performance multiband planar antennas with good radiation characteristics are needed. Recently many antennas with multiband characteristics have been designed for wireless applications [1-8]. Much effort has been spent on the research of such compact and multiband/wideband antennas [1]. A variety of compact multiband antennas have been developed so far, such as various kinds of printed monopole antennas [2-4], triangular-shaped meander monopole antenna [5], internal folded planar monopole antenna [6], and dual-band antenna with a backed microstrip line [7]. In this paper, we have proposed a multiband meander antenna with a backed microstrip line for mobile telecommunication systems (GSM, DCS, ISM, WiMAX). The proposed antenna consists of a meander line, U-shaped line, and a backed microstrip line. We have used meandering technique [6, 8] and U-shaped line to produce the GSM and DCS bands, respectively. A backed microstrip line technique [7] is used to produce the ISM & WiMAX band. Parametric studies and radiation characteristics for this antenna are presented. Ansoft high frequency structure simulator (HFSS) [9] is used to simulate the proposed antenna. Prototypes of the multiband antennas have been successfully implemented. The measured results of the fabricated prototype will be given and compared with the simulated results.