Accurate design of pseudoelliptic inline SIW filters with frequency-dependent couplings

Jedrzejewski, A.; Szydlowski, Lukasz; Mrozowski, Michał

doi:10.1109/mikon.2014.6899930

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…On the other hand, (11) and (12) also clarify the limitation of previous method in the literature. Without a correlative equation, i.e., (11), the value of θ 1 in [21] and [22] is specified by annihilating M i,i+1 during midterm transformations. In result, the corresponding variable α i may turn out to be a negative value, which thus prevents the further matrix manipulations and in-line topology simplification.…”

Section: Discussion and Comparison With Literaturementioning

confidence: 74%

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Advanced Direct Synthesis Approach for High Selectivity In-Line Topology Filters Comprising $N$ - 1 Adjacent Frequency-Variant Couplings

Macchiarella

et al. 2019

IEEE Access

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In this paper, a direct synthesis approach is presented to realize high selectivity in-line topology filters with adjacent frequency-variant couplings (FVCs). By considering the annihilation of frequencyvariant elements during admittance matrix transformation for the first time, this paper provides a deterministic mechanism (no optimization is involved) that can generate FVCs between every two cascaded resonators. In consequence, a high selectivity filtering response where N-1 transmission zeros are implemented and independently controllable can be achieved for an Nth-order in-line network. As the foundation, a novel matrix process is detailed to obtain two adjacent FVCs inside of a 4th-order in-line network. The Nth-order prototype is then realized based on the process in an iterative manner. A synthesis example is illustrated in terms of the proposed approach step by step to show validity. Eventually, a 6th-order in-line band-pass filter, which contains adjacent FVCs in two pairs has been designed and fabricated via coaxial cavity structures. The synthesis results, EM simulation results, and tested results are well matched with each other, which reveals the effectiveness of the presented method during physical implementation. INDEX TERMS Filter synthesis, frequency-variant coupling, coupling matrix, transmission zero, microwave filters. The associate editor coordinating the review of this manuscript and approving it for publication was Yongle Wu. FIGURE 1. Schematic of (a) in-line prototypes discussed in this work (with adjacent frequency-variant couplings); (b) traditional cross-coupled prototypes; and (c) traditional extracted-pole prototypes. Note that solid line refers to traditional constant coupling, dashed line refers to frequency variant capacitance (slope), and the combination represents frequency-variant coupling in this work.

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Section: Discussion and Comparison With Literaturementioning

confidence: 74%

“…The equations (11) and 12show that we can obtain the desired condition (i.e., elements in (10) equal to zero) by selecting an arbitrary value for θ 1 and determining with (11) and (12) the other unknowns. Note that, the chosen value of θ 1 must however ensure α i > 0 during manipulation.…”

Section: B Generation Of a 4th-order In-line Topologymentioning

confidence: 99%

Advanced Direct Synthesis Approach for High Selectivity In-Line Topology Filters Comprising $N$ - 1 Adjacent Frequency-Variant Couplings

Macchiarella

et al. 2019

IEEE Access

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“…For reducing the number of negative couplings, the concept of the matrix transformation [21] can be applied to (8) and (9). The matrix transformation for changing the sign of elements is given by…”

Section: Coupling Matrix Synthesismentioning

confidence: 99%

“…The matrix transformation using matrix R in (10) has also been applied to matrix U in (5) when transforming the matrices in (8) and (9) to the ones in (12) and 13, respectively. However, it is worth noting that this process does not change the sign of U 14 as shown in (12) and (13).…”

Section: Coupling Matrix Synthesismentioning

confidence: 99%

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Practical Design and Implementation Method for Asymmetric-Response Post-Loaded Substrate-Integrated Waveguide Filters

2020

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This paper presents a practical method for implementing a post-loaded substrate-integrated waveguide (SIW) filter producing an asymmetric response with a pair of near-band transmission zeros. More specifically, we present a practical frequency-dependent coupling structure for post-loaded SIW resonators for implementing an asymmetric response. By virtue of the proposed coupling design methods, the roll-offs in the upper and lower stopbands can be readily controlled to be different from each other. In other words, the roll-off in a stopband can be made to be steeper than the one in the other stopband by means of using the proposed design method for coupling structure. More importantly, we propose a useful approach to swap the two stopband responses of an asymmetric-response filter. In other word, this paper shows a practical method to laterally reverse an asymmetric response. For demonstration, 1 symmetric-response and 2 asymmetricresponse fourth-order SIW filters have been designed using the presented frequency-dependent coupling structures.

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Compact SIW filters with transmission zeros: A review and current trends

Macchiarella

Tomassoni

Bozzi

2021

Int. J. Microw. Wireless Technol.

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This paper presents a review of the recent advances in the field of substrate integrated waveguide (SIW) filters, with particular emphasis on the techniques adopted to increase the out-of-band rejection of the filters and on the miniaturization strategies. After an overview of classical approaches to introduce transmission zeros in SIW filters, a number of recently introduced techniques are presented. In particular, the use of specially implemented extracted-poles topologies and of pre-filters is described, discussed, and compared. For each of these techniques, numerical and experimental results are reported for validation.

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Accurate design of pseudoelliptic inline SIW filters with frequency-dependent couplings

Cited by 5 publications

References 9 publications

Advanced Direct Synthesis Approach for High Selectivity In-Line Topology Filters Comprising $N$ - 1 Adjacent Frequency-Variant Couplings

Advanced Direct Synthesis Approach for High Selectivity In-Line Topology Filters Comprising $N$ - 1 Adjacent Frequency-Variant Couplings

Practical Design and Implementation Method for Asymmetric-Response Post-Loaded Substrate-Integrated Waveguide Filters

Compact SIW filters with transmission zeros: A review and current trends

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