A diversity antenna for external mounting on wireless handsets

In this paper we introduce an antenna that has two feed ports and is suitab le for providing diversity signals in compact wireless communication handse ts. The design is based on merging a monopole and a lambda /4 slot antenna together to give a single compact antenna structure for external use on wir eless handsets. Experimental results are presented for designs that operate at 2.4 GHz and include radiation patterns, S-parameters, and signal correl ations between ports. It is demonstrated that signal cross correlations bet ween the feed ports of less than 0.1 in typical wireless environments at th e handset are possible.