The wireless device market is expanding rapidly nowadays as a result of the rapid advancements in technology in recent years. The antenna is the most crucial part of a wireless device since it facilitates communication and data transfer. In this paper a small microstrip antenna with dual circularly polarized bands is presented. The antenna is small and compact with dimensions 24 mm × 22 mm × 1 mm. The patch is loaded with an annular-ring slot and contains a quarter circle cut on one end. Two slits of varying length and width are also etched in the radiating patch on one side of patch opposite to each other for fine tuning to achieve better circular polarization. A rectangular defected ground structure is used for improving the radiation characteristics. The designed antenna shows good wide bandwidth, gain and circular polarization with dual circularly polarized bands for use in wireless communication (WLAN, WiMax) and satellite communication applications.