Design of microwave filter with resonant irises of resonant windows at different location

Zong-tao, Cui; Li, Shengxian

doi:10.1109/icmtce.2011.5915188

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Maximizing the capabilities of filter structures that have highly stringent requirements is of great interest but also comes with great difficulty. In examples such as [6], [11], [20], [21], [22], [23], [24], [25], resonating irises (RIs) have been proposed as a means of maximizing the use of given filter structures for single-band or dual-band configurations. It is clear that the impact of these types of resonating irises can have a significant influence not only on the obtainable filtering characteristics, but also the resulting size and weight.…”

Section: Introductionmentioning

confidence: 99%

Improved TM Dual-Mode Filters With Reduced Fabrication Complexity

2023

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This work presents an alternate and improved approach for the design of dual-mode filters that utilize transverse magnetic (TM) and nonresonating modes. The method that is proposed in this work allows for an improvement of the typical TM dual-mode filter design through the reformation of the coupling irises that connect the TM dual-mode cavity to the source/load waveguide ports, where the new interconnection means takes the form of resonate slot-irises. In this manner, a fourth-order quasi-elliptic response can be achieved within a very limited physical geometry and able to cover more than double the usable fractional bandwidth than previously reported. Furthermore, the selectivity and insertion loss of the filter response is significantly improved when compared to the typical single-cavity TM dual-mode filter response that uses coupling irises, while on the comparison of equal-order structures, a reduction in fabrication complexity and improved insertion loss is achieved. A characterization of the dimensional variations and effects of altering one of the source/load port positions in the proposed filter design is investigated in order to demonstrate notable effects on the rejection characteristics and positions of transmission zeros. A presentation on the design theory is given and formulations of various filter responses are examined. The fabrication of an experimental prototype with approximately 7.3% fractional bandwidth (FBW), centered at 90 GHz is conducted using high-precision computer numerical control (CNC) milling in order to demonstrate that the unique simplicity and overall compaction of this method can be easily applied at millimetre-wave frequencies without the need of tuning means. The results which are presented demonstrate highly accurate measurements throughout the W-band range, while an additional Q-factor analysis is provided in order to compare the improved filter scheme with other known design methodologies.

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Section: Introductionmentioning

confidence: 99%

Improved TM Dual-Mode Filters With Reduced Fabrication Complexity

2023

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“…Also, a directly coupled non-centered resonant irises filter has been designed in [32], in order to provide a broadband and highly selective response in Ka band, with a good spuriousfree range. Another example of the use of resonant irises as resonators of a microwave bandpass filter is found in [33]. More recently, a contribution has shown preliminary results on how to design dual-band waveguide filters using resonant apertures (RAs), with an important improvement of the out-ofband performance and selectivity by using, at the same time, capacitive stubs and a staircase configuration [34].…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Band and Wideband Filters With Resonant Apertures in Rectangular Waveguide

Sullca

Cogollos

Boria

et al. 2022

IEEE Trans. Microwave Theory Techn.

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The objective of this paper is to describe a new family of microwave bandpass filters in rectangular waveguide, based on resonant apertures, that can be used to implement both single and dual band transfer functions. The use of capacitive stubs and a staircase configuration is also discussed, in order to enhance the out-of-band response and the selectivity of the filter with respect to the state-of-the-art. Finally, simulations are compared with measured results, showing very good agreement, thereby fully validating both the new filter topologies and the design procedure.

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“…In an ultrawideband case, where the signal spectrum spreads over a frequency band covering several natural electromagnetic modes of the component, the appropriate model has to be reconsidered. The simple approach to enhancing the lump-element model consists in combining multiple resonant circuits [3]. However, this can be performed accurately only if the component possesses sharp resonances; otherwise, such a model will be nothing but an approximation technique, which can be developed further, to surrogate models [4].…”

Section: Introductionmentioning

confidence: 99%

Cyclostationary Approach to the Analysis of the Power in Electric Circuits under Periodic Excitations

2021

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This paper proposes a cyclostationary based approach to power analysis carried out for electric circuits under arbitrary periodic excitation. Instantaneous power is considered to be a particular case of the two-dimensional cross correlation function (CCF) of the voltage across, and current through, an element in the electric circuit. The cyclostationary notation is used for deriving the frequency domain counterpart of CCF—voltage–current cross spectrum correlation function (CSCF). Not only does the latter exhibit the complete representation of voltage–current interaction in the element, but it can be systematically exploited for evaluating all commonly used power measures, including instantaneous power, in the form of Fourier series expansion. Simulation examples, which are given for the parallel resonant circuit excited by the periodic currents expressed as a finite sum of sinusoids and periodic train of pulses with distorted edges, numerically illustrate the components of voltage–current CSCF and the characteristics derived from it. In addition, the generalization of Tellegen’s theorem, suggested in the paper, leads to the immediate formulation of the power conservation law for each CSCF component separately.

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Design of microwave filter with resonant irises of resonant windows at different location

Cited by 6 publications

References 2 publications

Improved TM Dual-Mode Filters With Reduced Fabrication Complexity

Improved TM Dual-Mode Filters With Reduced Fabrication Complexity

Compact Dual-Band and Wideband Filters With Resonant Apertures in Rectangular Waveguide

Cyclostationary Approach to the Analysis of the Power in Electric Circuits under Periodic Excitations

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