Abstract
Mechanically reconfigurable dual-band slot dipole antennas with wide tuning ranges are developed in this communication. The dual-band operation is achieved by inserting parallel slots with different lengths and the tuning is realized by incorporating a dual rack and pinion mechanism to slide parasitic patches to vary the slot lengths and the frequency of operation of each band. To demonstrate the proposed approach, two frequency-tunable antennas are prototyped. The first design uses two motors to tune the frequency band ratio between 1 and 2.6. The second design uses one motor to maintain a constant frequency band ratio of 2 over the tuning range of 2–3 GHz for the lower band and 4–6 GHz for the upper band. Both designs show minimal variation in gain, polarization, and radiation pattern over the tuning range.
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