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In this paper, a multi-band microstrip slot antenna is presented. The antenna is suitable for operation in mobile phone base stations. The antenna operating bands are (0.824 - 0.894) GHz, and (1.83 - 2.2) GHz. The antenna supports GSM850, PCS1900, and UMTS2100. The antenna is based upon placing a metallic rectangular brick inside a rectangular etched slot on the ground plane and incorporates a simple single layered feeding technique to achieve dual band operation used in mobile communications. This antenna element may be used in a linear antenna array to act as a mobile base station transmitter. The effort was directed towards the design of a single standalone antenna; however, the complete performance would be evaluated when it is incorporated as an array element. The average gain is 5.3 dBi at the lower band (GSM850), and is 2.5 dBi at upper band (PCS1900/UMTS2100). The Front-to- back ratio (FBR) is 16.38 dB at the lower band and is greater than 19.3 dB, at the higher band.

Free 60 GHz radios have unique characteristics that make them significantly different from traditional 2.4GHz or 5GHz license-free radios and from licensed-band millimeter-wave radios. These characteristics make 60 GHz radios more attractive for wireless systems. In this paper, dipole like Vivaldi antenna is designed to meet the requirements of 60GHz band. The feeding circuit is 100 Ω differential feeding. The operating bands range is (54GHz to 70GHz). The radiation patterns, efficiency, reflection coefficients (S 11 ), directivity and radiation gain are illustrated. The design is fabricated using one substrate of quartz glass. The antenna size is 2.225×0.3276×0.675 mm 3 .