José Manuel Catalá

High Power Waveguide Impedance Measurement System (HiPoM)

Microwave processing is a dynamic process where the properties of the processed workload change with time. Microwave parameters as dielectric properties, reflection, power balance, impedance, and frequency, etc. also experiment changes during the application of high-power microwaves.

On-line measurements of these microwave parameters can offer unique control capabilities, which might be critical for the successful application of microwave processing. Microwave industrial processes require specifically designed equipment to be used according to industrial conditions: high power, simple, affordable and robustness, while retaining a useful subset of their current functionality.

The HiPoM is a High-Power Vector Waveguide Reflectometer (1-port Network Analyzer) able to measure in real time the magnitude and phase of the impedance or the reflection (S11) at microwave frequencies (915 MHz , 2.45 GHz or 5.8 GHz) during the application of high power microwaves. Additionally, the HiPoM measures the frequency of the microwave source (magnetron or solid state) and the absolute incident, reflected and absorbed microwave power.

Typical applications include the tuning or adjusting a microwave applicator and also the monitoring of the evolution of a microwave heating process.

Figure 1. Picture of waveguide high power Vector Reflectometer around 2.45 GHz and 915 MHz.

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Measurement of Dielectric Properties at temperatures up to 350ºC with DKV

The use of microwaves in fields as communications, radar, medicine, biology, agriculture and industrial processes demands accurate knowledge of the dielectric properties of materials and its variations with respect to many factors.

In particular, monitoring variations of materials dielectric properties with temperature is crucial for many applications, in which it is important to predict the materials performance over the whole working temperature range.

In order to provide a suitable technique, the Dielectric Kit for Vials has been equipped with the necessary components for the dielectric characterization of materials up to 350ºC. …

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Measurement of Dielectric Properties at temperatures up to 350ºC with DKV Read More »

Measurement of dielectric properties

Dielectric properties are fundamental parameters that define how a material interacts with a microwave field, and therefore they are essential parameters for designing wireless devices, sensors and microwave processing systems.

To meet the growing demand for fast and accurate measurements and with our experience in measuring the complex permittivity of over hundreds of samples per year, ITACA-DIMAS offers highly precise and reliable dielectric measurement services by utilizing the most suitable measurement techniques according to the material specifications (material type, size, shape, frequency, temperature, etc.).

Dielectric properties can be correlated with properties such: moisture content, density, chemical reaction, structure, curing, bacterial content, etc.

ITACA-DIMAS also offers cost-effective stand-alone highly precise dielectric measurement systems for different types of materials. (see bespoke MW equipment section)

The different methods used for dielectric measurements are described next:

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EM Simulation

We offer design, modelling, and simulation services for RF and microwave components, covering various technologies like waveguide and planar technology.

Our expertise spans antennas, microwave components (filters, multiplexers, couplers), microwave sensors, and microwave heating applicators (monomode, multimode, flow applicators, etc.).

We employ advanced full-wave electromagnetic (EM) and circuit models, including proprietary and commercial software like MATLAB, HFSS, QW3D, Ansys, and others.

En example of simulation of mode stirrers in multimode chambers is illustrated in the next figure:

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Training

With more than 25 years of radio frequency and microwave expertise, combined with years of industry collaborations, ITACA-DIMAS offers technical training courses available in a variety of formats, including classroom training, on-demand online courses, virtual classroom training, and tailored training sessions at our facilities in Valencia, Spain.

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