In this article, which is a fundamental step in an underway research, microwave resonant sensor at two resonance frequencies of 5.5 and 8.5 GHz (in order to increase the accuracy application) with quality factor 180 106, for blood glucose level monitoring designed, fabricated, tested by users' fingertips. study, 11 volunteers were invasively (using glucometer) noninvasively proposed sensor) range glucose-level changes from 89 262 mg/dL. For changes, frequency detection resolution 3.53 3.58...

In this letter, a novel printed frequency-reconfigurable microstrip square slot antenna for switchable Bluetooth, WiMAX, and WLAN applications is presented. The proposed has small size of 20 × mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in order to be able cover lower frequencies; as Bluetooth applications, miniaturization techniques such modification the ground plane inserting an adjustable backplane cross-shaped sleeve have been...

In this paper, a planar microstrip sensor based on band-stop filter for determining relative permittivity of solid materials is presented. The proposed has been composed the structure meandered line with T-shaped resonator and an interdigital that connected ground by via. Interaction between caused to increase electric field intensity high sensitivity resolution. microwave using single layer technology fabricated substrate RO4003. samples FR4 RO4350 in double forms as multilayer are placed...

A new structure for transmitarray antennas is presented. The proposed semiplanar keeps certain geometrical curvature, that the required transmission phase range reduced significantly from 360°, causing an increase in bandwidth and efficiency. antenna has varied element thickness-the central being thinnest elements growing thickness as we move toward edges. To evaluate model, X-band prototype fabricated with number of layers 2 to 5 center edges aperture. was 360° 51.5°. Measurement results...

In this paper, a microwave sensor with meandered microstrip structure is introduced to measure the permittivity of various liquids. The performance based on change operating resonance frequency during absence and presence materials in sensing area. study, liquids including ethanol, methanol, aqueous glucose solution, deionized water have been selected as samples under test. proposed has implemented RO4003 substrate dimensions 35 × 20 0.508 mm3 6.21 GHz free load state Q-factor 506. When are...

Plasmonic demultiplexers using improved circular nanodisk resonators (CNRs) and metal-insulator-metal waveguides have been designed. The proposed structures use air silver as insulator metal layers, respectively. relative permittivity of has characterized by Drude, Palik, Drude–Lorentz models in our finite-difference time-domain simulations. To obtain demultiplexers, first two filters based on CNRs are One the most outstanding features a CNR is that resonance wavelength can be tuned changing...

Synthesis and design of a wideband reconfigurable filtering slot antenna (FSA) is presented in this letter. This achieved by using an open/short-ended interdigital E-shaped resonator through two integrated PIN diodes within its structure. A rectangular with M-shaped radiating stub excited the via inset coupling The also performs filter last stage, structure can be acted as admittance inverter. circuit model analyzed, synthesis process discussed curves formulation. FSA designed at center...

A compact plasmonic bandpass filter based on metal–insulator–metal waveguides and a coupled U‐shaped cavity is proposed in this study. Air silver are used as insulator metal materials characterised by the Drude model simulations. By tuning height of designed cavity, it found that resonance wavelength can be easily adjusted. Furthermore, quality factor increased increasing numbers. One, two or three cavities to generate single‐mode filters. Finally, sweeping different structural parameters,...