A model of transverse piano string vibration, second order in time, which models frequency-dependent loss and dispersion effects is presented here. This model has many desirable properties, in particular that it can be written as a well-posed initial-boundary value problem (permitting stable finite difference schemes) and that it may be directly related to a digital waveguide model, a digital f...

This article presented the design of two filters SIW (Substrate Integrated Waveguide) in two different bands. Their conceptions were made by two different topologies. The first SIW filter with circular inductive post in the band [33-50] GHz on an RT / Duroid 5880 substrate permittivity 2.2, the simulated results of this filter have shown that the insertion loss lower than -0.4 dB within 3.5% ba...

Dept. of Electrical Engineering, Indian Institute of Technology, New Delhi [email protected] Computer aided design of inductive iris filter in waveguide technology is described here using Mode Matching Method(MMM). Direct coupled cavity niters form compact structures. Such a bandpass filter is first designed using equivalent network theory approach. Mode matching method has been used to a...