In this paper a high performance Ultra Wide Band microstrip bandpass filter is presented. The filter is designed using λ/4 short circuited stubs to improve the performance of UWB. The designed filter is based on 5th order chebyshev low pass prototype with .1 dB passband ripples. The filter with total size of 45×11 mm operates within 3.1310.4 GHz, produces a fractional bandwidth of 106%. The fil...

This paper deals with using MATLAB function and tools for designing first-order analogue Chebysev filters and IIR Chebysev filters. The first part of this paper is focused on a design of analogue filter via Chebyshev approximation approach, i. e. features and mathematical background of this iso-extremal approximation, approximation of normalized low-pass (NLP, also NDP in Czech) filter, and mat...

In the present paper we give a characterization of Chebyshev subspaces in the space of (real or complex) continuously-differentiable functions of two variables. We also discuss various applications of the characterization theorem. Introduction. One of the central problems in approximation theory consists in determining the best approximation; that is, in a normed linear space X with a prescribe...

In section 4.1 a new class of higher order (F,ρi, σj)type I functions are introduced for a vector minimization problem. Various known generalized invex functions such as type-I, second order type-I and second order (F,ρi,σj)-type I are particular cases of higher order (F, ρi, σj)-type I functions. This class of functions is used to establish higher order duality results for a nondifferentiable ...