Step on It Bringing Fullwave Finite-Element Microwave Filter Design up to Speed

Balewski, L.; Fotyga, Grzegorz; Mrozowski, Michał; Mul, Martyna; Sypek, Piotr; Szypulski, Damian; Lamęcki, Adam

doi:10.1109/mmm.2019.2958165

Cited by 34 publications

(8 citation statements)

References 96 publications

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“…The other three examples include models of narrowband and wideband antennas, where only one excitation port is taken into account. After numerical discretization of the time-harmonic Maxwell's equations by means of the finite element method (FEM), the systems can be written in the form of (1). The inhouse code for FEM simulations uses a second-order first family of Nédélec's elements [25,31] on meshes provided by Gmsh [20].…”

Section: Numerical Resultsmentioning

confidence: 99%

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Inf-Sup-Constant-Free State Error Estimator for Model Order Reduction of Parametric Systems in Electromagnetics

Chellappa¹,

Li²,

Rubia³

et al. 2021

Preprint

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A reliable model order reduction process for parametric analysis in electromagnetics is detailed. Special emphasis is placed on certifying the accuracy of the reduced-order model. For this purpose, a sharp state error estimator is proposed. Standard a posteriori state error estimation for model order reduction relies on the inf-sup constant. For parametric systems, the inf-sup constant is parameter-dependent. The a posteriori error estimation for systems with very small or vanishing inf-sup constant poses a challenge, since it is inversely proportional to the inf-sup constant, resulting in rather useless, overly pessimistic error estimators. Such systems appear in electromagnetics since the inf-sup constant values are close to zero at points close to resonant frequencies, where they eventually vanish. We propose a novel a posteriori state error estimator which avoids the calculation of the inf-sup constant. The proposed state error estimator is compared with the standard error estimator and a recently proposed one in the literature. It is shown that our proposed error estimator outperforms both existing estimators. Numerical experiments are performed on real-life microwave devices such as narrowband and wideband antennas, as well as a dualmode waveguide filter. These examples show the capabilities and efficiency of the proposed methodology.

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Section: Numerical Resultsmentioning

confidence: 99%

“…The discretized model, shown in Fig. 12 is of dimension n = 283, 846 with f ∈ [1,6] GHz being the parameter space of interest. The input reflection coefficient at the coaxial port of the optimized Antipodal Vivaldi antenna is detailed in Fig.…”

Section: Example III : Antipodal Vivaldi Antennamentioning

confidence: 99%

Inf-Sup-Constant-Free State Error Estimator for Model Order Reduction of Parametric Systems in Electromagnetics

Chellappa¹,

Li²,

Rubia³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The design was optimized by altering the tuning screws and the widths and heights of the coupling irises. The zero-pole method was used as the optimization technique [11], [12]; this is available as a module in the InventSim EM field simulator.…”

Section: Filter Design and Fabrication A Filter Designmentioning

confidence: 99%

A Circular Waveguide Dual-Mode Filter With Improved Out-of-Band Performance for Satellite Communication Systems

Baranowski

Balewski²,

Lamęcki

et al. 2022

IEEE Microw. Wireless Compon. Lett.

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This letter presents a novel design for a 3D-printed circular waveguide dual-mode (CWDM) filter with a modified cavity shape. The modification leads to a wide spurious-free stopband, which is highly desirable for channel separation in waveguide contiguous output multiplexers (OMUXs) in satellite communication systems. The new resonant cavity design is a result of applying shape deformation to a basic circular cavity in order to move away and suppress parasitic modes. A fourth-order Ku-band channel filter with two transmission zeros is designed, fabricated by additive manufacturing (AM) in one piece and measured. In comparison with the state-of-the-art design of a stepped CWDM filter, an improvement of approximately 35% wider spurious-free range is achieved.

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“…The resonator length is adjusted until the addition of the input impedances of the NFVC inverter and the external input inverter, each of them loaded with half of the cavity-resonator length, becomes zero at the given resonant frequency of the waveguide cavity, which is 9.901 GHz as computed during the coupling-matrix synthesis. Finally, the synthesized design parameters are optimized to set the in-band return-loss level and out-of-band TZ locations as desired by using the pole-zero optimization technique available in the commercial EM simulator InventSim [34].…”

Section: A First Synthesis Example: Filter Imentioning

confidence: 99%

Compact Quasi-Elliptic-Type Inline Waveguide Bandpass Filters With Nonlinear Frequency-Variant Coupling Inverters

Gómez‐García¹,

Lamęcki²,

Mrozowski³

et al. 2022

Preprint

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This work presents the design techniques to synthesize a class of compact inline quasi-elliptic-type waveguide cavity bandpass filters based on novel nonlinear frequency-variant coupling (NFVC) inverters. These highly dispersive frequency variant couplings are realized by means of a pair of partial height posts that are placed at the junctions between each two cavity resonators. Each NFVC produces a transmission pole in between a pair of independently adjustable transmission zeros (TZs). Whereas the pole is added to the overall filtering function to augment its order, the TZs can be placed at each side of the filter passband to attain sharp rejection capability and increase the stopband attenuation levels. To synthesize these filters, two coupling-routing-diagram (CRD) approaches for the NFVC are presented that either consider (i) an arbitrary frequency-variant coupling (AFVC) or (ii) two resonating nodes interacting with a zero-susceptance non-resonating node through constant inverters. An equivalent lumped-element circuit model associated with both CRD approaches is provided. It is demonstrated that both CRD models can be exploited for the theoretical synthesis of this type of filters, whereas the equivalent lumped-element circuit model can provide a deeper insight for the systematic dimensioning of the posts. For experimental validation purposes, three design examples are synthesized, and 10-GHz proof-of concept filter prototypes of two of them are EM-simulated, fabricated, and characterized. The measured results agree well with the simulations and the design theory, thus verifying the concept of inline waveguide cavity filters with TZs using NFVCs. <br>

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Step on It Bringing Fullwave Finite-Element Microwave Filter Design up to Speed

Cited by 34 publications

References 96 publications

Inf-Sup-Constant-Free State Error Estimator for Model Order Reduction of Parametric Systems in Electromagnetics

Inf-Sup-Constant-Free State Error Estimator for Model Order Reduction of Parametric Systems in Electromagnetics

A Circular Waveguide Dual-Mode Filter With Improved Out-of-Band Performance for Satellite Communication Systems

Compact Quasi-Elliptic-Type Inline Waveguide Bandpass Filters With Nonlinear Frequency-Variant Coupling Inverters

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