Felipe L. Peñaranda-Foix

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In this paper, a full-wave method for the electromagnetic analysis of dielectric-loaded cylindrical and coaxial waveguides and cavities is developed. For this purpose, a new four-port ring network is proposed, and the mode-matching method is applied to calculate the generalized admittance matrix of this new structure. A number of analyses on(More)
A microwave cavity and heating system for microwave processing and in situ dynamic measurements of the complex permittivity of dielectric materials at high temperatures ( ~ 1000 <sup>&#x00B0;</sup>C) has been developed. The method is based on a dual-mode cylindrical cavity where heating and testing are performed by two different swept frequency microwave(More)
An improvement of the accuracy of dielectric measurements of the open-ended coaxial resonator method is described. The technique is based on an empirical technique for de-embedding the coupling network excited by electric probes. By this procedure, the influence of the coupling structure on the resonance can be precisely eliminated independently of the(More)
Microwave-assisted processes have recognized advantages over more conventional heating techniques. However, the effects on the materials' microstructure are still a matter of study, due to the complexity of the interaction between microwaves and matter, especially at high temperatures. Recently developed advanced microwave instrumentation allows the study(More)
One of the most important problems of microwave energy in industry is the need to perform a customized design, since applicator behavior is very dependent on the material. Little modifications in size or shape can make the applicator energy inefficient, since microwave cavities are usually very sensitive, which can result in a wasted high-reflected power.(More)
Waveguide structures are very popular in the microwave power industry due to their power handling capabilities. Modal expansion of the waveguide fields and application of the circuit theory allow for the division of a complex device into several simpler sections which can be analyzed separately with the best suited method. The modal techniques can be(More)
A dynamic microwave sensor system able to monitor compositional changes of the basic liquids used in the polyurethane industry (polyol and isocyanate) was designed, installed in the production line and tested. These liquids are continuously flowing into hermetic pipes and its desirable properties are gradually degraded in time. The sensor provides online(More)
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