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Sistemi di coordinate non comuni per la soluzione diretta dell'equazione d'onda in guide risonatori
No full text
A New Adaptive Prototype for the Design of Side-Coupled Coaxial Filters With Close Correspondence to the Physical Structure
No full textThis paper presents a novel kind of circuit prototype
suitable for modeling of coaxial cavity filters, where all cavities are coupled sidewise.
Initially, the parameters of the prototype are explicitly derived
from those of the classical Cohn’s inline filter, which is assumed as the starting point. The main feature of the proposed adaptive model is its one-to-one correspondence to the physical structure, making design feasible without additional optimizations or expensive tuning. Another feature lies in that the prototype is adapted to the structure along the way in the synthesis process.
A practical example shows the merits and the accuracy of
the proposed prototype. The relationships between the proposed method and existing techniques are also discusse
Analytical Study of the Optical Spectrum Shift in a Modulating Channel
No full textIn this work, an analytical model of the frequency
shift experienced by an optical signal passing through a traveling
wave modulating channel is derived. The model starts from the
well-known coupled-mode theory but holds for an arbitrary temporal
envelope of the optical signal and for any time dependence of
the slowly varying modulating field; it provides an analytical and
accurate explanation of various effects such as those due to losses
or microwave–optical group velocity mismatch. The practical
example of a modulated optical Gaussian pulse is provided
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