The dielectric properties and ionic conductivity of novel "ceramic state" polymer electrolytes for high capacity lithium battery are characterized by Radio frequency and Microwave methods in two broad frequency ranges from 50 Hz to 20 KHz and 4 GHz to 40 GHz. This innovative solid polymer electrolyte which is highly ionic conductive (10 S/cm at room temperature) from -40C to +150C can be used i...

Resonant methods are well known for their accuracy in determining the complex permittivity of materials. However, to guarantee accuracy, interference modes must be suppressed measurement band. In this paper, a multi-mode split rectangular cavity is designed and fabricated measure low-loss anisotropic dielectric materials frequency range from 300 1000 MHz. Details design presented. Simulation re...

This paper presented a microwave resonator-based dielectric metrology technique using new unified analytical model to extract complex permittivity of low-loss liquid materials. The main design drive the modified re-entrant cavity is confine electric field and therefore enhance interaction with material under test while maintaining high quality factor cavity. enables sensitivity when measuring l...

Ammonia-based selective catalytic reduction (SCR) has become the major control strategy for NOx emissions from light and heavy duty diesel engines. Before reducing NOx on the SCR active material, ammonia storage on the active sites of the catalyst is crucial. The in operando measurement of the dielectric properties of the catalyst material using microwave cavity perturbation is a promising indi...

We have developed a noncontact method to probe the electrical conductivity and complex permittivity of single and polycrystalline samples in a flow-through reactor in the temperature range of 20-500 °C and in various gas atmospheres. The method is based on the microwave cavity perturbation technique and allows the simultaneous measurement of microwave conductivity, permittivity and of the catal...

Ring-capacitor sensors are used widely for real-time estimation of volumetric soil water content u from measured resonant frequency fr, which is directly affected by the bulk soil permittivity e. However, the relationship fr(e) requires improved quantification. We conducted laboratory experiments to characterize the response of the Sentek EnviroSMART sensor system for a full range of e values f...

Artificially engineered multiphase heterostructures with high permittivity, high permeability and low dielectric and magnetic losses are desired for microwave applications. In addition, the direct conversion of electrical (and/or magnetic) energy to mechanical work through a material response is important for many practical applications. Thus, there is a need for sensitive and quantifiable tech...

The dielectric dispersion ε' and dielectric loss ε" of binary mixture of 1,2-diaminopropane–dimethylaminoethanol were measured by employing the time domain reflectometry technique over a frequency range from 10 MHz to 20 GHz at 288, 298, 308, and 318 K temperatures. The accuracy in the measurement of the ε' and ε" values obtained from this technique is within ±5%. To evaluate various dielectric...