Abstract
Inhomogeneities of the electromagnetic field are observed at the edges of the electrodynamic delay systems which are designed based on the concept of periodic multiconductor line. The inhomogeneity manifests itself as a non-uniformity of the characteristic impedance and the effective permittivity of the multiconductor line consisting of a finite number of conductors. The influence of non-uniformity of impedance and effective permittivity of the multiconductor microstrip line on the frequency responses and characteristics of meander delay lines is studied in this paper. It is shown that matching characteristic impedance and effective permittivity of the multiconductor line the bandwidth of the delay line can be extended and delay time increased preserving its dimensions. DOI: http://dx.doi.org/10.5755/j01.eee.19.6.4279
Highlights
The results of the simulation of the meander microstrip delay line (MMDL) based on the model of the multiconductor microstrip line (MCML), operating in the even mode are shown in Tables V–VIII with characteristics marked the subscript (u), which corresponds to the uniform effective permittivity MMDL
The influence of non-uniformity of the multiconductor microstrip line (MCML) parameters: characteristic impedance and effective permittivity on characteristics of the meander microstrip delay line (MMDL): delay time and bandwidth is studied in this paper
The performed calculations showed that the MMDL based on the model of the uniform impedance MCML is better matched with the transmission path and has a wider bandwidth than the non-uniform impedance MMDL
Summary
Delay lines (DL) are widely used in electronic systems for various purposes, e.g. analogue signal processing [1, 2], analog-to-digital converters [3], synchronization of signals [4], to shape radiation pattern of antenna arrays [5, 6], filter design [7] and as a substantial part in many other devices [8,9,10,11,12,13,14].At present, the DLs, based on active components, are popular [9, 11]. Oscillations of magnitude response of S21 parameter lead to the fact that the bandwidth of the uniform effective permittivity MMDL is determined by the amplitude response rather than phase one, how it was investigating the influence of characteristic impedance nonuniformity on frequency characteristics of the MMDL (see Chapter II of this paper).
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