For the first time, a millimeter-wave dual-polarized dielectric resonator (DR) reflectarray fabricated by three-dimensional (3D) printing with high relative permittivity materials is presented. The unit cell of composed two elliptical DRs orthogonally placed in center. A base layer slab at bottom for fixture and connection its adjacent elements. each polarization, only length long axis one DR v...

The relative complex dielectric permittivity, e*5e82ie9, of ice has been measured in the frequency range 5–39 GHz and in the temperature range 190–265 K. The cavity resonator method at 5 and 10 GHz and the open resonator method at 33 and 39 GHz were used to determine the low dielectric loss of ice. The real part of permittivity e8 was independent of the frequency. The temperature dependence of ...

The design and fabrication of a band-pass step impedance filter based on high and low dielectric constant sections has been realized on substrate integrated waveguide (SIW) technology. The overall process includes the design of the ideal band-pass prototype filter, where the implementation of the impedance inverters has been carried out by means of waveguide sections of lower permittivity. This...

The eutectic LiF−LiYF4 has been solidified by Bridgman and micro-pulling down (mPD) at pulling rates from 4 to 300 mm/h. The microstructure changes from a coupled, interpenetrated-like one to macrofaceted colonies composed of an approximately triangular arrangement of LiF fibers inside the LiYF4 matrix as the pulling rate increases. The cross-over pulling rate is around 3 times larger for the m...

Background/introduction High intensity focused ultrasound (HIFU) ablation of the brain has been increasingly used as a non-invasive treatment for essential tremor and neuropathic pain. However, artifacts arise in magnetic resonance (MR) images as a result of dielectric properties of the water bath coupler and of the tissues being investigated. As radio frequency (RF) waves enter a dielectric me...

This letter presents a comprehensive impedance spectroscopy characterisation of Magnéli phases (TinO2n-1) over a range of temperatures, which are of interest in electrochemistry and sensing applications, with the aim to enhance the understanding of their electrical properties and influence their microstructure. The impedance of the TinO2n-1 can be resolved into two different contributions, name...

Abstract: To estimate the freshness of beef meat the dielectric measurements were carried out on the twenty five samples. Capacitance (C) and conductance (G) were measured using LCZ meter over a frequency range from 10 kHz to 1 MHz. The measured values were used to calculate permittivity and conductivity of beef at various time intervals (2, 4, 10, 20, 30, 40 and 50 days) during storage. The ef...

phases (solid, liquid, and gas) are known, especially if the model is to be used to predict water content or Measurement of soil dielectric properties, ε are widely used to porosity. The permittivity of air and water are well docuestimate water content in soils from remote sensing and from in situ soil sensors such as time domain reflectometry (TDR). The mineral mented (Lide, 1999). However, a ...

Controlling the electromagnetic properties of dielectric objects is demanded in microwave applications such as radar cross section (RCS) studies, metamaterial design, and antennas prototyping. Additive manufacturing has made fabrication desired shapes easier, but there still room for improvement controlling permittivity. This article proposes a novel approach to control permittivity 3-D printed...