De‐embedding techniques for embedded microstrips

Abstract

summary, the TE 01 and TE 03 modes are working modes for temperatures lower than 40°C. The TE 01 mode is the working mode up to 40°C. Then, the lossy load can induce a multimodal character for the waveguide, even for a frequency close to 2.45 GHz.Therefore, several centimeters after the discontinuity between the source and the waveguide, the applicator will select the mode(s) which offer(s) the lowest attenuation (according to temperatures TE 01 and TE 03 ). For the structure studied, we never observe the TE 02 , TE 03 , and TE 04 modes. However, these modes will participate in heating at the beginning of the application because all modes are excited due to the dielectric loss of the water pipe. So, during the microwave heating of the rod, we can consider several modes in order to forecast the electric-field distribution. Thus, knowledge of electromagnetic behavior of the loaded waveguide allows us to forecast the electric-field radial distribution. Then, with a good choice of pipe diameter, it is possible to suggest a structure which will provide uniform heating over the available section of the cylindrical load. According to these results, the effect of dielectric losses upon the mode-propagation parameters is a consequence. Obviously, it is not possible to deduce the behavior of lossy structures from the data of lossless ones. CONCLUSIONA powerful computer-aided-solution procedure has been designed for the study of high-power industrial applicators. Modes established for lossless structures have been extended to high-loss systems and limits of classical perturbation approaches can be completely avoided. Taking into account dielectric losses is a key goal for the design of optimized microwave industrial applicators for microwave heating of fluids within pipes. Moreover, dielectric tuning due to thermal dependency of dielectric properties must be taken into account. It has been shown that our approach provides an accurate means of trapping modes for lossy loaded cylindrical applicators.The information made available by this technique is a valuable contribution to a more precise understanding of electromagnetic distribution within the applicator. Moreover, our approach should enable the predictive control and design of optimized travellingwave applicators. According this study, a viable alternative to the trial and error methods currently used to design microwave applicators for industrial heating applications has been proposed. In order to characterize on-wafer circuitry for any device, it is necessary to gain test access to that circuitry. This is generally accomplished by placing test access ports (pads, vias, interconnects, buffers, and so on) on the silicon and the circuit to be tested. For most low frequencies, techniques have been developed which ensure that the effect of the test access ports on the measurement is negligible. However, for high-frequency (Ͼ1 GHz) parametric measurements, it is generally not possible to gain access to the circuit under test without significantly impacting the measurement be...

Effective medium modeling and experimental characterization of multilayer dielectric with periodic inclusion

“…physically half of the 'through' structure. Literature [37,44] reports a correlation between the S parameters of these two structures as:…”