Abstract
Multi-functional antennas are very important in modern wireless communication systems. A novel dual-band frequency-reconfigurable antenna with pattern diversity is designed. The antenna consists of a composite right/left-handed transmission line inspired structure, which works at the zeroth-order mode (0) around 2.5 GHz and at the first-order mode (1) around 3.5 GHz. The 0 mode results in an omni-directional pattern and the 1 mode results in a broadside pattern. By adding varactors to continuously reconfigure the structure, the antenna is able to tune its lower resonant frequency from 2.36 to 2.60 GHz, which fully covers the 2.4-2.5 GHz ISM band, and tune its higher resonant frequency from 3.34 to 3.73 GHz, which fully covers the 3.4-3.7 GHz WiMAX band. Simulations and experiments match well, proving the validity of this new concept.
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