A microwave method based on complementary split-ring resonators (CSRRs) is proposed for dielectric characterization of planar materials. The technique presents advantages such as high measurement sensitivity and eliminates the extensive sample preparation procedure needed in resonance-based methods. sensor shape CSRRs working at a 0.8-1.3 GHz band demonstrated. etched ground plane microstrip line to effectively create stopband filter. frequencies which minimum transmission reflection are...

Metamaterials are typically made of an ensemble electrically small resonators such as metallic loops. The fact that particles resonate individually to generate a bulk material behavior having enhanced constitutive parameters is essentially indicative these particles' ability collect energy. We show act energy collectors when resistive load inserted within the particle's gap. A proof concept provided using 5.8 GHz field and split-ring resonator (SRR) electromagnetic collecting cell. Numerical...

Single-negative magnetic metamaterials are used in order to reduce mutual coupling between high-profile antennas multiple-input multiple-output systems. The permeability of the developed single-negative inclusions have negative effective response over a specific frequency band. considered here composed broadside coupled split-ring resonators. inserted closely-spaced monopole antenna elements. It is shown that elements can be reduced significantly by incorporating such inclusions. Effective...

This letter presents a novel engineered magnetic superstrate designed to enhance the gain and efficiency of microstrip patch antenna without any substantial increase in profile whole structure (the with superstrate). The modified split ring resonator (MSRR) inclusions are used design superstrate. Numerical full-wave simulations as well analytical models analyze entire radiating system. Considering an example operating within UMTS band, broadside was improved by 3.4 dB 17% when using total...

A new sensor based on complementary split-ring resonators is presented to detect sub-millimeter surface cracks. The sensing mechanism perturbing the electromagnetic field around an electrically small resonator, thus initiating a shift in resonance frequency. simple fabricate and inexpensive as it etched out ground plane of microstrip-line using printed circuit board technology. exhibits frequency more than 240 MHz for 100 μm crack.

In this study, we present a microwave-based microfluidic mixer that allows rapid mixing within individual droplets efficiently. The designed microwave is coplanar design with small footprint, which fabricated on glass substrate and integrated chip. works essentially as resonator accumulates an intensive electromagnetic field into spiral capacitive gap (around 200 μm), provides sufficient energy to heat-up pass through the gap. This actuation induces nonuniform Marangoni stresses interface,...

A microwave sensor for non-destructive measurement of dielectric thickness is presented. The a quasi-static resonator and based on complementary split ring (CSRR) structure. When the CSRR structure backed by conductive medium covered with layer resonance frequency has strong dependence layer. Effect size sensitivity analyzed numerically. For experimental verification, that operates in 1.6 to 2.3 GHz band fabricated excited microstrip line.

Droplet-based microfluidics is an emerging high-throughput screening technology finding applications in a variety of areas such as life science research, drug discovery and material synthesis. In this paper we present cost-effective, scalable microwave system that can be integrated with microfluidic devices enabling remote, simultaneous sensing heating individual nanoliter-sized droplets generated microchannels. The key component electrically small resonator able to distinguish between...

We report a microwave-microfluidics integrated approach capable of detecting droplet at high-throughput and label-free sensing individual content without physical intrusion.

We present a near-field waveguide probe with an embedded array of split-ring resonators (SRRs) that operate at 16.65 GHz. When the scans metal surface, magnetic flux generated from currents on metallic surface strongly affects equivalent lumped parameters SRRs. This, in turn, reflection coefficient feeding port leading to high sensitivity detecting anomalies such as cracks surface. Experimental results indicated feasibility cracks, small 25 μm width, surfaces. Additionally, achieves good...

Most of the previous microwave near-field probes and imaging techniques focused on surface imaging, providing ultrahigh lateral resolution. Few were developed for subsurface detection, offering both high depth resolution with varying degrees effectiveness. In this work, a novel probe using single split-ring resonator is introduced primary focus detection. The design simple, compact, inexpensive, easy to fabricate printed circuit board technology. Fourier spatial analysis field new reveals...

Evanescent probe imaging is a powerful characterization technique with subwavelength resolution. In this paper, we present theoretical and numerical study of the effect using double negative (DNG) single (SNG) metamaterials in evanescent imaging. A sensitivity definition introduced for probes it shown quantitative measures that can be increased DNG material target vacuum buried target. minimum thickness required to achieve an improvement sensitivity. For target, there fundamental limitation...

In this paper, artificial magnetic resonators are used in order to reduce mutual coupling Multiple-input Multiple-Output (MIMO) systems. Split-ring resonator (SRR) inclusions inserted between closely-spaced high-profile monopole antenna elements. It is shown that the elements can be reduced significantly by incorporating such inclusions. The materials work as insulators, and thus applied a variety of applications.

A method is introduced to measure the effective constitutive parameters of metamaterials having negative permittivity, permeability, or permeability and permittivity simultaneously. The based on strip line topology, thus offering low cost setup complexity in comparison other methods. proposed here validated by numerically simulating measurement while using different types metamaterials. To validate experimentally, a metamaterial over band frequencies characterized. Good agreement obtained...

In spite of various existing thermometry methods for microfluidic applications, it remains challenging to measure the temperature individual droplets in segmented flow since fast moving do not allow sufficient exposure time demanded by both fluorescence based techniques and resistance detectors. this contribution, we present a microwave method that is non-intrusive requires minimal external equipment. This technique relies on correlation fluid with resonance frequency sensor operates at GHz...

This work presents analysis of the behavior open-ended coaxial near-field probes in presence ε-negative material. The effect using negative material layers on sensitivity is studied. It shown that optimal conditions related to thickness and constitutive parameters medium give rise significant enhancement probe which allows have higher detection resolutions. analytical formulation validated three-dimensional full-wave simulations medium.

Metamaterial-based microwave components are among the state-of-the-art heater and sensor designs for microfluidic systems. The miniaturization energy-focusing abilities of metamaterial-based make it possible to adopt operating at wavelengths in order 10 cm Microwave systems particularly advantageous point-of-care high-throughput applications due their high speed operation, very low instrumentation cost, ability selectively internally heat specimens, label-free sensing. In this study,...

In this paper, we present experimental verification of the sensitivity improvement evanescent-field probes using single-negative (SNG) metamaterials. Artificial magnetic materials are designed and fabricated to realize a ¿-negative SNG material. The response an electrically small probe target is investigated numerically experimentally. deviation in phase reflection coefficient due measured. When layer employed, shift presence improved nine times compared without layer.

The realization of double negative (DNG) meta-materials and the evanescent field amplification feature these materials engendered new approaches to subwavelength imaging. In this paper, we study possibility subsurface detection using fields in presence a DNG lens. Evanescent at lower frequencies can have better penetration characteristics compared propagating higher frequencies. Using materials, images targets buried homogeneous lossy medium are presented.

In this work, we show that by using single negative (SNG) media, the sensitivity of open-ended near-field waveguide probes can be enhanced. The enhancement is due to evanescent wave amplification property SNG media. As a demonstration efficacy proposed SNG-enhanced probe, present numerical study case detecting precursor pitting in aluminum plates. We probe achieves 35 times increase phase shift presence target comparison classical probe. there an optimum media thickness and standoff distance...

Recently, we showed that single negative media can significantly enhance the sensitivity of near-field probes. Inspired by this recent finding, propose a new probe uses only one split ring resonator instead periodic arrangement these resonators. We show through numerical simulations proposed lead to significant enhancement in as measured change phase reflection coefficient. Experimental tests were conducted detect presence small aluminum block located behind layer ground chicken (lossy...

In this work, we present the first experimental verification of sensitivity improvement evanescent field probes using single negative (SNG) metamaterials. The response an electrically small probe to target is investigated. deviation in phase reflection coefficient due measured. When SNG layer employed, shift presence a improved 9 times compared classical probe.

First Page