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A UHF band tunable built-in antenna is realized using piezoelectric MEMS variable capacitors. The variable capacitor, which is driven by a piezoelectric actuator, has a tuning ratio of 11 with control voltage ranging from 0 to 8 V and quality factor of more than 37 at 650 MHz. The built-in antenna, which is an inverted-F antenna, is mounted at the top of an upper PCB board of a clamshell mobile phone,...
In this paper, the wideband properties of a proposed antenna with the low-voltage-actuated MEMS variable capacitor is shown by calculation and measurement. First the mechanism of the wideband properties of the proposed antenna due to the use of a dual resonant mode is clarified. Then, applying the MEMS variable capacitor, the properties of the proposed antenna are calculated and measured
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