Designs of the Monopole Slot Antenna Arrays Operated at the WLAN Band

Design procedures of two-element monopole slot antenna arrays are presented in this paper. We proposed several array topologies utilizing different feeding structures and injecting in-phase or out-of-phase signals to achieve power-combining radiation patterns. The sum and difference radiation patterns are successfully achieved and are theoretically analyzed. Furthermore, the power-combining characteristics are also presented by two proposed antenna arrays. The proposed antenna arrays can be candidates of the radiator for the base station or access point of the wireless local area network system.