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This paper presents an Inverted-F Antennas (IFAs) type MIMO antenna with Wi-Fi and Blue-Tooth band for smart watch application. The overall dimensions of 40×40×5.4 mm3 of the proposed design consisting of an antenna portion of 40×5×0.1 mm3 and system ground portion of 40×40×0.4 mm3. The antenna geometry is composed of two identical IFA antennas extended from the two side of the ground, which designed...
This paper reports, the fabrication by screen-printing and characterization of different types of free-standing structures. The process is based upon sacrificial surface micromachining using a water-based removal method enabling the fabrication of free-standing structures. Diaphragms, cantilevers and encastre beam structures have been fabricated simultaneously on a single substrate, demonstrating...
The paper presents the results of poly-cut layer lithography process development for 28 nm technology nodes and beyond, which include the simulation of illumination modes, the assessment of tri-layer chemical materials and verification on the silicon wafer. The small sigma illumination mode is considered as the most suitable illumination mode to meet the requirements of resolution and DOF performance...
A finite element model based on coupled field was established to analyze and design high quality GaN epilayers grown on Si substrate with thin variable composition graded AlxGa1−xN interlayers. Theoretical simulation shows that AlxGa1−xN interlayers can effectively reduce the tensile stress which generated in the cooling process between Si and GaN for thermal mismatch. When the AlxGa1−xN is single...
This paper reports, for the first time, capacitive freestanding cantilever beams fabricated by screen printing sacrificial and structural materials onto a fabric/textile. Unlike traditional weaving process, the device will be screen printed layer by layer with desired pattern onto the fabric substrate. Free standing structures will be fabricated directly onto fabrics rather than other methods such...
Response of nanomechanical resonant mass sensors to adsorption does not only depend on the mass loading, but also on the adsorbate stiffness, adsorption induced surface stresses and location. It is therefore clear that with just resonance frequency measurement, decoupling the stiffness and the mass effects is difficult. A recent theory proposed using the electrostatic pull-in instability (EPI), in...
The fixed-fixed beam in RF switches fabricated by MEMS techniques of a sacrificial layer is inclined to stick to the substrate due to the significant capillary force during drying process. In this paper, sticking models of the fixed-fixed beam are investigated to analyze the sticking effect. Based on these models, an adhesion criterion hc for the fixed-fixed beam is derived to determine whether the...
This paper presents a novel approach for deriving a physically meaningful circuit model for multilayered spiral inductors on lossy silicon substrates. The approach starts from a quasi-static Partial Element Equivalent Circuit (PEEC) model. The concept of complex inductance and capacitance is introduced to account for the conductor and dielectric losses. Basic Y-Δ network transformation is employed...
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