The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
To support EMC test and measurements a single band chiral metamaterial absorber is suggested in this study for EMC absorber solutions. We analyze a novel chiral metamaterial absorber composed of crescent shaped split-ring resonators at the X-band (8.2–12.4 GHz). To supplement proposed absorber, different loss tangent (δ) values are also considered. Reflection and absorption spectra illustrated high-performance...
It is well-known that a resonating metamaterial can interact with other nearby resonating metamaterials. If this coupling is strong enough, it may change resonant behaviour of overall metamaterial structure composed of individual metamaterial resonators. Therefore, defining each part separately, especially the coupling factor, simplifies the electromagnetic compatibility (EMC) problems. In this study,...
A self-calibration noniterative technique for determination of the optical constants and thickness of lossless materials using only three reflection measurements is proposed. A generalized model is derived based on the reflection measurements. For validation, two different samples (Si and GaAs samples) are considered for extraction of their optical parameters and thicknesses by using a numerical full...
Metamaterials (MMs) are engineered material with electromagnetic properties not commonly seen by natural materials such as negative refraction and near-zero permittivity. These materials have interesting applications ranging from perfect lens and electromagnetic cloaks to leaky-wave antennas and shifters. For such applications, electromagnetic properties of MMs are needed to be known. In this study,...
In this study, frequently encountered unwanted parasitic or noise signals during the transmission of electromagnetic signals are tried to be reduced by a new approach is proposed. By this method, the mentioned noise effect between the near transmitter-receiver or two reciprocal antennas, is aimed to be eliminated. In this context, to provide more healthier data transfer between the transmitter and...
Nearby metamaterial (MM) slabs can interact with each other, resulting strong coupling which eventually change the characteristics of an individual MM slab. In this study, we apply the signal flow graph technique to examine the coupling phenomenon between MM slabs. To this end, we use the scattering (S-) parameters of each individual MM slab as well as the whole composite MM structure in which MM...
This paper presents a new method for extracting relative complex permittivity (εr) of dielectric materials by eliminating calibration standards. To validate proposed method it is compared with well known three techniques in literature. All measurements are done by using waveguide measurement techniques which is broadband over X-band (8.2GHz–12.4GHz) frequency range with VNA. While these three methods...
Superconducting resonators and filters in the microwave range are being made by thin film technology and used in base stations for wireless communication. The operation of superconducting resonators in perpendicular magnetic fields normally leads to a reduction in the device performance due to energy dissipating by Abrikosov vortices. We fabricated YBCO resonator to eliminate losses due to vortex...
A microcontroller based microwave free-space measurement system for a real-time determination of dielectric permittivity of high loss planar materials is proposed. The measurement system is comprised of two main sections - microwave and electronic sections. While microwave section of the system provides for measuring only amplitudes of transmission and reflection coefficients using free-space method...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.