Abstract: The antenna introduced in this paper is frequency-reconfigurable and the feed configuration can be changed, with the length of a rectangular slot being changed using an RF MEMS switch. The principle of frequency reconfigurability is analyzed both from antenna’s equivalent LC oscillation circuitry and from the changing route of resonant tank’s current. The results indicate that the antenna can operate at three frequency bands: bluetooth, DCS/GSM and GPS, all in the L/S band. Due to the same radiation mode, the radiation pattern of the antenna operating in the 3 bands is exactly the same. Changeable feed configuration using RF MEMS switch can solve the matching problem directly originating from the change of radiator structure. The results also show that the antenna has good reconfigurability and high radiation gain. The antenna can be used for multiple purposes.

Key words: alterable feed configuration, frequency-reconfigurable antenna, RF MEMS switch, reconfigurable principle