Finite element modeling of electrode mass loading effects in longitudinal leaky SAW resonators

Abstract

broadside direction on the radiation pattern, especially at the higher frequency band. However, the overall antenna pattern shows the unidirectional radiation to the desired target direction, which is useful for the high-directive radar imaging applications. It is observed from the simulation results that the gain of the bowtie antenna with a reflector increases from 6.5 to 8.5 dBi, almost double the case without a reflector, which gives more high directional gain to the target direction. CONCLUSIONA novel unidirectional horn-shaped tapered bowtie slot antenna with a pyramidal reflector has been designed and fabricated for ultra high-resolution radar imaging applications. The implemented antenna performance shows very low return loss less than Ϫ10 dB over 3.0 -11.7 GHz and a quasi-unidirectional radiation that shows a high front-to-back ratio over the whole UWB frequency band. This result shows enhanced new performance compared with the previously available antenna design, which will be useful for ultra high-resolution UWB radarimaging applications.

High-Performance SAW Resonator with Spurious Mode Suppression Using Hexagonal Weighted Electrode Structure

“…As shown in Figure 2b, the value of the admittance was the maximum when the electrode thickness was 200 nm; the results of both simulations are consistent. The phenomenon of electrode mass loading was introduced when the metal film covered the piezoelectric material, and the thickness variation of the electrode would directly affect the admittance of the SAW resonator [23]. When the admittance reached its maximum value, the impedance and losses of the designed surface acoustic wave sensor reached their minimum; thereby, the amplitude of the Rayleigh wave reached its maximum.…”

Fast electromagnetic simulation algorithm based on hierarchical and curvilinear finite elements

“…As the tangential vector finite element method (TVFEM) can cope with material discontinuities as well as sharp edges and corners in a natural way, it has been widely applied in the analysis of electromagnetic problems and has gained great success [1–4]. In the past few decades, the lowest order basis, i.e., Whitney basis [5], has been thoroughly investigated and widely used in the analysis of electromagnetic devices.…”