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Electronics 2019, 8(1), 81;

The Reentrant Four-Layer Quasi-Elliptic Bandstop Filter

Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
Radio-Receiving and Radio-Transmitting Devices Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia
Department of Electronic Devices, Novosibirsk State Technical University, Novosibirsk 630073, Russia
General Physics Department, Novosibirsk State Technical University, Novosibirsk 630073, Russia
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 25 December 2018 / Accepted: 2 January 2019 / Published: 10 January 2019
(This article belongs to the Section Microwave and Wireless Communications)
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The novel microwave quasi-elliptic bandstop filter, which uses the initially uncoupled strip transmission lines, is considered in this work. The proposed filter is based on the reentrant structure, where the metallic body with a floating potential is asymmetric. Generally speaking, the internal and external dielectric fillings must have their unequal relative permittivities. As a result, additional symmetrical reflection zeros are reached at the lower and upper pass bands of the stop band leading to the quasi-elliptic function response that improves the filter selectivity. The general transverse electromagnetic (TEM) circuit model for the proposed filter in terms of a series connection of the multi-ports is presented and then used to predict the initial electrical and geometrical parameters. An experimental printed circuit prototype has been manufactured and evaluated to validate the design concept. The measured filter parameters correlate well with the simulation-derived ones and that increases the degree of freedom in the fabrication of microwave frequency selective components. View Full-Text
Keywords: bandstop filter; reentrant structure; multilayer implementation bandstop filter; reentrant structure; multilayer implementation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Atuchin, V.V.; Gorbachev, A.P.; Khrustalev, V.A.; Tarasenko, N.V. The Reentrant Four-Layer Quasi-Elliptic Bandstop Filter. Electronics 2019, 8, 81.

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