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Comparison of various high-frequency models of RF chip inductors

Csurgal P., Kuczmann M.

Przegląd Elektrotechniczny

2011

R. 87, nr 3

25-28

RF chip inductors are the most widely used inductors. Due to the miniaturization the continuous improvement ot the electrical parameters are highly requested. This demand ot the improvement makes the accurate electrical model ot the inductors essential. The purpose ot the paper is to present an evaluation and comparison ot the currently available methods tor calculating the inductor behaviour in trequency domain using analytic formulas, finite element simulations, and real measurements on market available RF chip inductors.

Induktory z czipami o częstotliwościach radiowych RF są najszerzej używanymi induktorami. Dzięki miniaturyzacji ciągłe ulepszanie parametrów elektrycznych jest pożądane. Żądanie poprawy czyni, ze dokładne elektryczne modele induktorów zyskują na znaczeniu. Celem pracy jest pokazanie ewaluacji i porównania obecnie dostępnych metod dla obliczania działania induktora w dziedzinie częstotliwości przy użyciu wzorów analitycznych, symulacji metodą elementów skończonych, a także rzeczywistych pomiarów na dostępnych na rynku induktorach.

Measuring the stray capacitance of solenoids with a transmitting and a receiving coil

Mariscotti A.

Metrology and Measurement Systems

2011

Vol. 18, nr 1

47-56

Air core solenoids, possibly single layer and with significant spacing between turns, are often used to ensure low stray capacitance, as they are used as part of many sensors and instruments. The problem of the correct estimation of the stray capacitance is relevant both during design and to validate measurement results; the expected value is so low to be influenced by any stray capacitance of the external measurement instrument. A simplified method is proposed that does not perturb the stray capacitance of the solenoid under test; the method is based on resonance with an external capacitor and on the use of a linear regression technique.

A Helmholtz coil for high frequency high field intensity applications

Cirulo S., Mariscotti A., Viacava A.

Metrology and Measurement Systems

2009

Vol. 16, nr 1

117-127

In this work a general introduction to Helmholtz coil is presented and then attention is drawn to the implementation of a wideband (50 kHz) coil for applications requiring high magnetic flux density (up to a few mT) for sensor calibration, immunity tests and exposure of biological specimens. Experimental characterization confirms that field uniformity is quite good: dispersion is within 1.5% and 0.35% inside cubic volumes of 25% and 10% of the coil side respectively for the larger spacing; the measured impedance and the self resonance frequency are in accordance with the proposed simplified model; the magnetic field expanded uncertainty with k=2 is less than 0.5%.