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- W4321770283 abstract "The letter proposes two design methods to increase the stopband and one-sided selectivity of combline bandpass filters (BPF) with mixed couplings between adjacent resonators. One method allows us to expand the stopband of a combline BPF. It is based on the location patterns of special points along the length of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$boldsymbol {lambda }$ </tex-math></inline-formula> /4 resonator and the elimination of a number of periodically located resonant frequencies using them. This method is applicable to combline BPFs with simple and mixed couplings. The second method refers to BPF with mixed coupling between adjacent resonators that contains magnetic and electrical components <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$acute {K}_{i,i+ 1} = K_{mi,i_{+} 1}+ , K_{e i,i+ 1}$ </tex-math></inline-formula> and generates a transmission zero <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$f_{z i,i+1}$ </tex-math></inline-formula> (TZ), leading to increased selectivity. This method uses the representation of mixed coupling by admittance inverter ( <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$hat{J}$ </tex-math></inline-formula> inverter) and consists of two stages. At the first stage, the absolute values <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$vert acute {K}_{i,i+ 1}vert $ </tex-math></inline-formula> , are determined. In this case, <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$g$ </tex-math></inline-formula> -parameters of the low-frequency prototype are used. At the second stage, the components <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$K_{m i,i+ 1}$ </tex-math></inline-formula> and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$K_{e i,i+ 1}$ </tex-math></inline-formula> are determined by using the <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$f_{z i,i + 1}$ </tex-math></inline-formula> position. The method is applicable to <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$N$ </tex-math></inline-formula> -order BPF. The experimental results are presented." @default.
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- W4321770283 date "2023-04-01" @default.
- W4321770283 modified "2023-10-07" @default.
- W4321770283 title "Combline Filters With Increased Stopband and One-Sided Selectivity" @default.
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- W4321770283 doi "https://doi.org/10.1109/lmwt.2022.3221269" @default.
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