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In this paper, a dual-band CPW-fed MIMO antenna is designed and analyzed. Fundamental resonance of the coplanar stepped impedance resonator (CSIR) produces the 1st operating band, while its harmonic resonance and the resonance of the rectangular slot line resonator (RSLR) construct the 2nd band. The port-to-port isolation within the 2nd band is high since it works at the harmonic resonant frequency...
This paper investigated pH measurements using ZnO based Surface Acoustic Wave Resonator (SAW). The resonant frequency of the SAW decreased as pH changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H3O+) or hydroxide (OH−) and ZnO was proposed...
This abstract describes room temperature ozone sensing using a ZnO based film bulk acoustic resonator (FBAR). The resonant frequency of the FBAR decreased upon ozone exposure due to the density increase of the ZnO film. Ozone can be adsorbed on the ZnO surface by capturing free electrons from the film, which increases the film density. The minimum detectable concentration is 21 ppb (parts per billion)...
This paper describes the new design and material selection used to improve the sensitivity of ionizing radiation sensing with a zinc oxide based Film Bulk Acoustic-Wave Resonator (FBAR). Prior results [1] demonstrated that the parallel resonant frequency of the FBAR decreased after irradiation due to radiation-induced charge trapping in the SiN. Here, by employing Plasma Enhanced Chemical Vapor Deposited...
This paper described ultraviolet (UV) radiation sensing using ZnO based Film Bulk Acoustic-wave Resonator (FBAR). The resonant frequency upshifted when there was UV illumination on the FBAR. For 365 nm UV light, the frequency upshift was 9.8 kHz with an intensity of 600 muW/cm2, and the detection limit of the sensor was 6.5 nW. The frequency increase of the FBAR UV sensor was proposed to be due to...
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