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99 results on '"Bastioli, Simone"'

6. Direct-Coupled TE–TM Waveguide Filters

Author

Bastioli, Simone, Snyder, Richard V., Tomassoni, Cristiano, and de la Rubia, Valentin

Abstract

This article presents a new class of bandpass filters, which extends the state-of-the-art of direct-coupled waveguide cavity structures. The new filter class possesses the strengths of the most advanced pseudo-elliptic nonresonating mode TM cavity filters while maintaining the versatility of realizing both narrow and wide passbands as is for the most conventional inductive iris direct-coupled waveguide filters. The key characteristic of the proposed filter class is that TE10 and TM11 sections are directly coupled to each other without using any dedicated coupling element while still making it possible to fully control all the coupling coefficients by solely adjusting the position and orientation of the sections. After an initial design based on coupling matrices, conventional and/or mixed lumped-distributed equivalent circuits, coupling curves, and simple design guidelines, the optimization of these structures can be carried out using well-known mode-matching and integral equation-based techniques, as well as the more recent full-wave model of the electromagnetic coupling matrix. Several configurations and filter examples, including the experimental results of an ${X}$ -band SATCOM bandpass filter, are presented to validate the effectiveness and versatility of this new general class of waveguide bandpass filters.

Published
2024
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19. Waveguide pseudoelliptic filters using slant and transverse rectangular ridge resonators

Author

Bastioli, Simone, Marcaccioli, Luca, and Sorrentino, Roberto

Subjects
Microwave filters -- Analysis, Cavity resonators -- Analysis, Waveguides -- Analysis, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper presents a novel class of resonators suitable for the design of waveguide pseudoeiliptic filters. The basic structure is a rectangular ridge arbitrarily located and oriented within a rectangular waveguide sized to allow the propagation of the fundamental TElo mode. The ridge has the capability to provide both a reflection and a transmission zero, thus behaving as a singlet. The coupling coefficients of the resonator can be controlled by varying the position and orientation of the ridge, or by additional elements such as irises or ridge taps. Compact pseudoelliptic filters can be designed by cascading multiple ridges and half a wavelength waveguide sections. A practical design procedure is presented. The experimental results of a fifth-order filter with three resonant ridges validate the proposed approach. Index Terms--Bandpass filters, elliptic filters, singlets, transmission zeros (TZs), waveguide filters.

Published
2008

39. Compact Mixed-Mode Filter Based on \rmTE\mathrm {101} Cavity Mode and \rmTE\mathrm {01\delta } Dielectric Mode.

Author

Tomassoni, Cristiano, Bastioli, Simone, and Snyder, Richard V.

Subjects
*BANDPASS filters, *ELLIPTIC filters, *CAVITY resonators, *DIELECTRIC resonators, *PERMITTIVITY, *TRANSMISSION zeros, *DIELECTRIC-loaded waveguides
Abstract

A new class of compact in-line filters with pseudoelliptic responses is presented in this paper. The proposed filters employ a new type of mixed-mode resonator. Such a resonator consists of a cavity loaded with a suspended high permittivity dielectric puck, so that both cavity TE101 mode and dielectric TE \mathrm {01\delta } mode are exploited within the same volume. This structure realizes the transverse doublet topology and it is therefore capable of generating a transmission zero (TZ) that can be either located above or below the passband. Multiple mixed-mode resonators can be used as basic building blocks to obtain higher order filters by cascading them through nonresonating nodes. These filters are capable of implementing TZs that are very close to the passband edges, thus realizing an extreme close-in rejection. As a result of the dielectric loading, the proposed solution leads to a very compact structure with improved temperature stability. To validate the proposed class of filters, a second-order filter with 2.0% fractional bandwidth (FBW) and a fourth-order filter with 2.5% FBW have been designed and manufactured. [ABSTRACT FROM AUTHOR]

Published
2016
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