A novel, cost-effective, flexible microwave sensor is proposed to facilitate point-of-care testing (POCT) methods for medical diagnosis. The based on the complementary split-ring resonator (CSRR) accurately measure permittivity of biomaterials over a wide range frequencies. This ability can be used characterize various materials under test (MUT) such as blood, saliva, tissue samples, etc. flexi...

The electrical properties of many materials are closely related to their composition and to their moisture content in particular. For sensor development, characterising the response of a particular volume of material over a broad frequency range is desirable, since separate measurements could generate errors due to spatial variability. A coaxial probe has been designed for measurement of the pe...

TTA especially with the filtering of higher frequencies in cables longer than 3.2 m resulting in increased signal Water content and electrical conductivity of soils are routinely rise time (Heimovaara, 1993; Noborio, 2001). Timing or determined using time-domain reflectometry (TDR) based on analysis length measurement errors associated with finite pixel of signal travel time and attenuation alo...

Corresponding Author: Kok Yeow You, Department of Radio Communication Engineering, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Malaysia Email: [email protected] Abstract: Determining the Moisture Content (MC) inside rice grain is an important element for grain processesing such as harvesting, storage, quality control and transportation. A microstrip wide-ring sensor and a m...

Background: In this article, III-V semiconductors are proposed as materials for far-infrared and terahertz plasmonic applications. We suggest criteria to estimate appropriate spectral range for each material including tuning by fine doping and magnetic field. Methods: Several single-crystal wafer samples (n,p-doped GaAs, n-doped InP, and n,p-doped and undoped InSb) are characterized using refle...

Marble beams were subjected to gradually increasing three-point bending from low loading levels up to levels that significant damage was observed. After each loading step the permittivity was measured at three characteristic locations: the tensional, middle and compressional zone of each sample. The permittivity measurements were conducted in the frequency range from 1kHz to 1MHz. The permittiv...

Measurement of the dielectric permittivity of colloidal suspensions in the kilohertz frequency range (the so-called low-frequency dielectric dispersion) is a promising tool for the electrokinetic characterization of colloids. However, this technique is less used than would be desirable because of the difficulties associated with the measurements, the most important of which is the electrode pol...

The microwave cavity perturbation (MCP) technique is used to identify the transition from magnetite (Fe3O4) to the meta-stable form of maghemite (γ-Fe2O3). In this study Fe3O4 was annealed at temperatures from 60 to 300 °C to vary the oxidation. Subsequent to annealing, the complex permittivity and magnetic permeability of the iron oxide powders were measured. The transition to γ-Fe2O3 was corr...

The article presents an in situ sensor to monitor soil moisture and water salinity by measuring permittivity conductivity at a frequency 24 MHz via admittance approach. It addresses difficulties encountered other permittivity-based sensors. A self-balanced bridge provides on one measurement digital output linear capacitance conductance of electrodes with low offset, high phase resolution, takin...