Abstract
The tunable microstrip patch antenna using electrostatic force is presented. The antenna was patterned on the top side of a (poly-ethylene terephthalte) film. When a DC bias voltage is applied between the flexible patch and the fixed ground plane, the flexible patch bends downwards towards the fixed ground plane owing to the electrostatic force of attraction. The bending of the flexible patch decreases the air-gap, and consequently the effective permittivity of the antenna is increased. By increasing effective permittivity, the resonant frequency is shifted downwards. For the tunable microstrip patch antennas of 6, 8 and 10 GHz at DC bias 150 V, the measured tuning ranges were 217.04, 242.58 and 365.63 MHz, respectively.
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