Increasing the bandwidth of a meander line antenna consisting of two strips

Small antennas for handsets in personal communication systems are required. A meander line antenna (MLA) can be used in such systems. The input impedance of the MLA can be easily matched by use of impedance step-up and balance mode impedance loading. But increasing the bandwidth of an MLA through the use of a two-strip geometry has not been accomplished so far. A method for increasing the bandwidth of the 2-strip MLA is described. An equivalent circuit of the MLA is represented by use of the balance mode impedance as an open- or short-circuited shunt stub. On the basis of the equivalent circuit, a numerical analysis of the impedance characteristics of the 2-strip MLA is carried out. In the analysis, the contribution of the parameters of the 2-strip MLA towards increasing the bandwidth are discussed.