Reconfigurable Dual-Stopband Filters With Reduced Number of Couplings Between a Transmission Line and Resonators

Lee, Kang-Ho; Lee, Tae‐Hak; Ahn, Chang-Soo; Kim, Young‐Sik; Lee, Juseop

doi:10.1109/lmwc.2014.2382659

Cited by 22 publications

(13 citation statements)

References 9 publications

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“…In addition, they have been experimentally verified only in dual-stopband circuits. Moreover, due to practical aspects involved in their circuit structures, such as the use of multilayer geometries in [6] and [7] and RF transformers in [8], their real extrapolation to more-than-two-band implementations for a single stage can be more complicated than in the filtering architectures that are presented in this paper. On the other hand, tunable multiband BSFs could easily be developed by simply cascading several tunable single-band bandstop filtering units as for example the ones in [10]- [14].…”

Section: Introductionmentioning

confidence: 99%

Fully Adaptive Multiband Bandstop Filtering Sections and Their Application to Multifunctional Components

Psychogiou

Gómez‐García

Peroulis

2016

IEEE Trans. Microwave Theory Techn.

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An original RF design approach for the realization of fully reconfigurable planar multiband bandstop filters (BSFs) is reported. The engineered RF filtering topology allows independent control of its stopbands in terms of center frequency and bandwidth. It exploits the in-series cascade of K spectrally agile N-notch filtering cells that are connected through K − 1 static impedance inverters to realize an N-band filtering transfer function with K th-order stopbands. Each of these multinotch cells is formed by N tunable resonators-center-frequency control-that interact with the same nonresonating node by means of different variable couplings-bandwidth control. Additional features of this tune-all multiband BSF architecture when compared with related prior-art devices are: 1) scalability to the synthesis of an arbitrary number of stopbands; 2) notch-spectral-merging capability into wider eliminated bands of the same order, which equivalently allows the intrinsic control, i.e., without RF switches, of the amount of active rejected bands; and 3) smaller physical size. The coupling-matrix modeling of the conceived multiband BSF scheme is presented. Moreover, its cointegration with other RF analog-processing actions in multifunctional components, such as bandpass filtering and power division, is investigated. For experimental-validation purposes, three UHF-band mechanically reconfigurable microstrip prototypes are developed and tested. They correspond to a dual-notch filter, a wideband bandpass filter with embedded notches in its tunable passband, and a Wilkinsontype power divider with inserted stopbands for dynamic multiinterference mitigation.Index Terms-Bandpass filter (BPF), bandstop filter (BSF), multiband filter, multifunctional circuit, notch filter, power divider, reconfigurable filter, tunable filter, wideband filter.

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Section: Introductionmentioning

confidence: 99%

Fully Adaptive Multiband Bandstop Filtering Sections and Their Application to Multifunctional Components

Psychogiou

Gómez‐García

Peroulis

2016

IEEE Trans. Microwave Theory Techn.

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“…Three-dimensional (3D) BSFs, such as those based on substrate-integrated-coaxial (SIC) [5]- [9] and -waveguide (SIW) [10]- [14] architectures, enable significantly higher Qs (100-600) and isolation (IS). In particular, SIC-based BSFs exhibit among the smallest physical size and widest tuning range-i.e., one octave of fcen tuning with > 40 dB of IS [7], [9].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, SIC-based BSFs exhibit among the smallest physical size and widest tuning range-i.e., one octave of fcen tuning with > 40 dB of IS [7], [9]. Nevertheless, they are only able to suppress a single band, except for the dual-bandstop BSF in [10]. Dual-band BSF configurations using SIWs have also been shown [11]- [14].…”

Section: Introductionmentioning

confidence: 99%

Dual-Bandstop Substrate-Integrated-Coaxial Tunable and Static RF Filters

Psychogiou

Zhao

Gómez‐García

2021

IEEE Microw. Wireless Compon. Lett.

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This letter discusses the RF design and practical realization of dual-bandstop filters with compact size and two independently-controlled rejection bands. They are based on miniaturized substrate-integrated-coaxial (SIC) resonant stages that are made from two capacitively-loaded posts and a thru line. Each of the stages creates two transmission zeros (TZs) that can be exploited for the realization of dual-bandstop RF filters with approximately half the size of conventional single-post seriescascaded SIC filter configurations. Further miniaturization is achieved by tuning the center frequency of the bands. For proofof-concept validation purposes, three prototypes were designed, manufactured, and measured. They include a static (rejection bands centered at 4 and 4.5 GHz) and a tunable (between 3.6-4.6 GHz) dual-bandstop second-order RF filters and a third-order dual-bandstop RF filter with bands centered at 4 and 4.4 GHz.

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“…In the literature, various types of reconfigurable bandstop filters were proposed [11][12][13]. Therefore, the use of compact reconfigurable filters has become increasingly important.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications

Fertas¹,

Ghanem²,

Challal³

et al. 2019

PIER M

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In this paper, a compact reconfigurable tri-band bandstop filter (BSF) with sharp-rejection and high selectivity is presented. The proposed filter is based on a 50 Ohms microstrip feed line, six hexagonal metamaterial cells (HMCs) with different sizes and switches. The structure of the filter has seven different modes of operation characterized. A good agreement between the simulated and measured results is obtained. The results indicate that the proposed filter design, with overall size of 0.28λg × 0.17λg, is a good candidate for multiservice radios applications.

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Reconfigurable Dual-Stopband Filters With Reduced Number of Couplings Between a Transmission Line and Resonators

Cited by 22 publications

References 9 publications

Fully Adaptive Multiband Bandstop Filtering Sections and Their Application to Multifunctional Components

Fully Adaptive Multiband Bandstop Filtering Sections and Their Application to Multifunctional Components

Dual-Bandstop Substrate-Integrated-Coaxial Tunable and Static RF Filters

Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications

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