In this paper are theoretically analyzed, and experimentally confirmed, some preliminary results about the high-frequency behaviour of coils. The analysis is based on the well known multiconductor transmission line theory, applied to an equivalent line model obtained through a simple geometrical transformation of the coil. Closed form formulas predicting the essential deviations from ideal at high frequencies (well beyond the first resonance) are presented. The response to different types of feeding (balanced or single ended) is also described. The bunch or bulk current concept is introduced. The analysis of the bulk current reveals that the magnetic field generated by the coil remains constant and predictable at frequencies up to eight times higher than the resonant frequency of the coil. Experimental results confirming the theoretical predictions are presented and discussed.

The Bulk Current Concept: a New Technique for High-Frequency Operation of the Coils in the Standard Magnetic Field Generation / Carobbi, Carlo; Millanta, Luigi; Soldani, David. - STAMPA. - 2:(2004), pp. 813-817. (Intervento presentato al convegno IEEE Instr. and Meas. Tech. Conf. 2004 tenutosi a Como, ITALY nel May 2004) [10.1109/IMTC.2004.1351186].

### The Bulk Current Concept: a New Technique for High-Frequency Operation of the Coils in the Standard Magnetic Field Generation

#### Abstract

In this paper are theoretically analyzed, and experimentally confirmed, some preliminary results about the high-frequency behaviour of coils. The analysis is based on the well known multiconductor transmission line theory, applied to an equivalent line model obtained through a simple geometrical transformation of the coil. Closed form formulas predicting the essential deviations from ideal at high frequencies (well beyond the first resonance) are presented. The response to different types of feeding (balanced or single ended) is also described. The bunch or bulk current concept is introduced. The analysis of the bulk current reveals that the magnetic field generated by the coil remains constant and predictable at frequencies up to eight times higher than the resonant frequency of the coil. Experimental results confirming the theoretical predictions are presented and discussed.
##### Scheda breve Scheda completa Scheda completa (DC)
2004
MTC 2004 - hslrumeniaiion and Measurement Technology Conference, Como, Italy, 18-20 May 2004
IEEE Instr. and Meas. Tech. Conf. 2004
Como, ITALY
May 2004
Carobbi, Carlo; Millanta, Luigi; Soldani, David
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Utilizza questo identificatore per citare o creare un link a questa risorsa: `https://hdl.handle.net/2158/237535`
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