MW Measurement Techniques

Open-ended coaxial probes

Open-ended coaxial probes are widely used at microwave and RF frequencies due to their precision and non-destructive testing capabilities.

In material characterization, these probes measure the dielectric properties of solids, liquids, and biological tissues, which is essential for advancements in electronics, telecommunications, materials, and medical diagnostics. For instance, they help to determine the properties of new materials like ceramics and polymers, analyze liquids in chemical and pharmaceutical processes, and study the dielectric properties of biological tissues for medical research and device development.

In industrial quality control and sensors, open-ended coaxial probes can ensure the consistency and quality of materials during manufacturing. They monitor composite materials in the aerospace and automotive industries, verify the properties of ceramics, and measure moisture content in food products like grains and dairy to maintain quality and extend shelf life.

With extensive expertise in coaxial circuits and resonance measurements, ITACA-DIMAS offers on-demand design and precision manufacturing of microwave open-ended coaxial probes tailored for accurate dielectric or magnetic measurements, sensors, or microwave processing of materials to meet specific requirements.

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Microwave Measurement Techniques

This line conducts both theoretical and experimental research to develop precise metrology techniques and measurement devices, particularly in the field of microwave and RF (radiofrequency).

Our measurement services encompass power, noise, impedance, dielectric and magnetic material properties, and other fundamental quantities. We also tailor specific devices and methodologies for dielectric measurements to suit the material’s specific microwave frequency requirements.

This line also includes both basic R&D and applied research in the field of Microwave and Millimeter Wave Nondestructive Testing and Evaluation  (microwave sensors).

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MW-DETA

Microwave Dielectric and Thermal Measurements (MW-DETA) as a function of temperature

MW-DETA is an innovative device and methodology engineered to measure the temperature-dependent variations of dielectric properties of materials at microwave frequencies with the simultaneous application of microwave irradiation.

The MW-DETA is designed in an 105dx85h mm dual-mode cylindrical cavity reactor, featuring two non-interfering, distinct swept-frequency microwave sources. The TE111 mode near 2.45 GHz is used to heat an approximate 15x10mm sample with high-power microwaves, while the TM010 mode around 2.1 GHz measures dielectric properties as a function of temperature.

Dielectric properties of materials as a function of temperature are calculated by an improved cavity perturbation method from the changes in resonant frequency and quality factor in the microwave cavity during heating. Accuracy of complex permittivity results has been evaluated with an error lower than 5% with respect to a rigorous analysis of the cavity.

The functionality of the microwave dielectric measurement system has been demonstrated by heating and measuring hundreds of samples of materials to more than 1000ºC.

The correlation of the complex permittivity with the heating rate, temperature, absorbed power and other processing parameters can help to better understand the interactions that take place during microwave heating of materials at high temperatures compared to conventional heating.

The cavity also incorporates access holes for introducing the material sample within a quartz tube, sample inspection via a video camera and enabling temperature measurements using an infrared pyrometer.

The specific methodology employed to determine dielectric properties is reported in the publication [Catalá-Civera 2015].

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