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A novel methodology is proposed for the design of ultra-wideband filters by the combination of the transmission-line-theory-based frequency-transformation technique to a recently-proposed Chebyshev-filter-based synthesis technique. Firstly, the frequency-transformation technique is mathematically formulated and applied to the basic distributed transmission-line elements — short-circuited shunt stubs,...
This article presents a design of a high‐performance ultra‐wideband (UWB) bandpass filter with a controllable notched band. Firstly, a UWB filter consisting of a stepped‐impedance resonator (SIR) and two shunt short‐circuited stubs is synthesized. Then, a narrow controllable notched band is introduced by a coupled external SIR. To be highlighted as an attractive advantage, as the characteristics of...
In this paper, two-dimensional Photonic Crystal Multi-Mode Interference devices having square/triangular lattice patterns of periodic air holes in a planar dielectric slab are numerically considered. Firstly, the dispersion properties of 2D photonic crystal structures are computed by using the plane wave expansion method. With numerical computation and simulation by Alternating Direct Implicit-based...
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