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Influence of sintering temperature on the complex permeability, the core loss density and B-H hysteresis loop of ferrite low-temperature co-fired ceramic (LTCC) multilayer toroidal cores is presented. Ferrite LTCC toroidal cores are fabricated from 22 layers of ESL 40011 tapes sintered at 885, 1000, 1100 and 1200 °C. Applying the sinusoidal excitation, the measurements are performed in the frequency...
In this paper a capacitive pressure sensor with two flexible membranes is presented. The sensor consists of two electrodes on membranes, a spacer and an additional dielectric layer between the electrodes. The sensor is fully printed in an ink-jet printing technology using a nanoparticle silver ink. The polyimide foils are used as membranes, a spacer of the sensor and a dielectric isolation layer....
The aim of this work is to investigate the polyimide based capacitive sensor for displacement measurements. The working principle of the proposed sensor is based on the change in the capacitance under displacement of an upper electrode fabricated on a polyimide membrane while the lower electrode is fixed. The nanoparticle silver ink is used for ink-jet printing of the electrodes on the polyimide foils...
Presented in this paper are the layout and results of a compact inkjet-printed filtenna which is operational at a broadband frequency range, which includes the S-band, ISM and UWB frequencies. Alongside, the filtenna is able to reject the unwanted and interfering WiMAX 3.5 GHz, WLAN 5.8 GHz and ITU service 8.2 GHz signal bands. The filtenna was simulated, printed using silver nanoparticle ink on flexible...
This paper presents the layout and results of a compact inkjet-printed filtenna operating at the S-band, ISM and UWB frequencies. The filtenna has a wide passband and, alongside, rejects WiMAX 3.5 GHz, WLAN 5.8 GHz and ITU service 8.2 GHz bands. The filtenna is simulated, printed using silver nanoparticle ink on flexible Kapton substrate and measured. Obtained simulation and measurement results agree...
This paper presents design and simulation of two-layer inductor on PCB substrate. Three two-layer spiral inductors were measured in the air and sandwiched between two ferrite plates, with an Impedance Analyzer HP 4191A in the frequency range up to 100 MHz. The measured results are compared with simulated, obtained with in-house developed simulation tool based on partial inductance method.
This paper presents the capacitance change of interdigital capacitor (IDC) by bending test structure (substrate with capacitor). Interdigital capacitor is fabricated in inkjet printing technology with nanoparticle silver ink on a flexible polyimide foil. First set of tests were done by bending printed interdigital capacitor around axis that is parallel to the capacitors electrodes and around axis...
In this work a method for liquid level measurement is presented, with a support of experimental results. The presented liquid-level measurement method uses two sensors: level and reference interdigital capacitors. Proposed sensors are fabricated in low-cost inkjet printing technology with nanoparticle silver ink on a Novele™ coated polyethylene terephthalate (PET) substrate. The sensors comprise a...
In this paper, electrical properties of inkjet printed graphene patterns on a PET-based (Novele™ IJ-220) substrate are presented. Water-soluble graphene conductive ink (Phene plus I3015) was used. Tested samples were printed with up to 12 layers. Desktop inkjet printer with 2000 dpi resolution was used for printing. After that, structures were sintered at 100 °C for 30 minutes. Printed patterns surface...
This paper presents continued research on CPW (coplanar waveguide) meander inductors. The inductors were made in inkjet printing technology. They were printed on polyethylene terephthalate (PET) based substrate (Novele IJ-220), 140 µm thick. Water-based nanoparticle silver ink (Metalon® JS-B25HV) is used for printing. The fabricated inductors have a great value of quality factor (up to 4.2) and high...
In this paper we investigate the possibility of displacement detection by approaching dielectric plate to electrodes of interdigital capacitor. Working principle of this sensor is based on penetration depth of the fringing electric fields above capacitors electrodes and its intersection with dielectric plate. Tests were done with interdigital capacitor and dielectric plates fabricated in Low Temperature...
This paper presents fully inkjet printed CPW (coplanar waveguide) octagonal inductor. The inductor was printed with water-based silver nanoparticle ink on flexible polyethylene terephthalate (PET) substrate. The fabricated structure has small outer dimension (8.5mm × 8.5mm), and value of effective inductance around 20 nH. Measured Q-factor is up to 1, and self-resonant frequency is slightly below...
In this work, we present for the first time a new fabrication process based on a 3D direct laser writing technique which allows the patterning of several layers in a single step by adjusting the power supplied by the laser in function with the optical properties of the materials. This approach was used for the fabrication of a piezoresistive MEMS (Micro Electro-Mechanical System) sensor made of flexible...
This paper describes a method for measuring strain on a specimen with flexible strain sensor. The sensor is made by ink-jet printing of silver ink on polyimide substrate, in that manner providing a combination of electrical conductivity and mechanical flexibility. When a force is applied on the free end of cantilever beam, three different strain gauges are used to measure flex of the beam. The gauge...
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