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Planar spiral inductors made of a single-wall carbon nanotube (SWCNT) bundle are investigated in order to achieve higher values of the quality factor for high frequency automotive applications. The inductor is modeled as an equivalent circuit whose frequency dependent parameters are obtained by an analytical/numerical procedure. A sensitivity analysis to some design parameters is carried out for frequencies...
In analog-digital mixed circuit boards, noises from the digital side to the analog side through G ND power supply layer is one of the problems. As one of the methods to reduce noise, slot type GND power supply layer is used. It is to divide G ND power supply layer with slot. However, this method has problems. One of the problems is impedance mismatch on the signal line between the analog and digital...
In this paper, two kinds of compact waveguide structures based on through glass vias (TGVs) technology are proposed. A full-wave simulator on the basis of finite element method is applied to analyze the transmission characteristics of these structures. The return loss S11, transmission S21 and electric field distribution results show that they have the similar signal transmission performance of the...
When a primary factor of common-mode noise is corresponding to mismatch of balance on the wiring, the balance degree may be obtained from CMRR (Common Mode Rejection Ratio) of the printed circuit board in the equipment. We calculated CDF(Current Division Factors) as balance degree of micro strip lines. And we showed relational expression of the balance degree and CMRR. By the CMRR measurement, the...
Knowing the frequency dependent complex permittivity of Printed Circuit Board (PCB) substrates is important in modern electronics. In this paper, two methods for measuring the permittivity are applied to the same Flame Resistant (FR4) substrate and the results are compared. The reference measurement is performed by inserting the sample in a rectangular waveguide and measuring the scattering parameters...
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