Design of Ultra-Wideband Bandpass Filters With Fixed and Reconfigurable Notch Bands Using Terminated Cross-Shaped Resonators

Wang, Hui; Tam, Kam‐Weng; Ho, Sut‐Kam; Kang, Wei; Wu, Wen

doi:10.1109/tmtt.2013.2296530

Cited by 70 publications

(39 citation statements)

References 29 publications

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“…However, especially in the BPF prototype implemented in [20], the moderate power-rejection depths of the embedded controllable stopbands are noticeably deteriorated with frequency tuning. The same performance shortcoming is shared by the UWB BPF structure suggested in [21] that is made up of variablereactance-element-terminated cross-shaped resonators. This paper presents a simple but efficient alternative for the design of spectrally agile planar multiband BSFs.…”

Section: Introductionmentioning

confidence: 92%

“…However, most of them exhibit embedded spectrally static notches [15], [16]. It should be noted that only a very few broadband BPFs with incorporated in-band tunable notches have been conceived [17]- [21]. In [17], a coplanar-waveguide UWB BPF with two spectrally agile stopbands was described.…”

Section: Introductionmentioning

confidence: 99%

“…This results in size-miniaturization and insertion-loss advantages when compared with a conventional solution based on the series cascade of separate bandpass and multinotched-band filtering units. Furthermore, unlike in the previous wideband BPF structures with in-band notches as those in [17]- [21], both the overall transmission band and the embedded rejected bands can be independently tuned in a unique RF device. Besides, as in the 3-D filter in [12] that only considers one embedded tunable stopband in its passband range, equivalent multiband bandpass filtering transfer functions with controllable center frequencies and bandwidths can be realized through this design technique.…”

Section: Introductionmentioning

confidence: 99%

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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: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…To deal with different coexisting communication needs, the reconfigurable notch-band implementation is required, but little research is concentrated on a UWB BPF with reconfigurable, switchable, or tunable notch bands as in [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband Bandpass Filter With Sharp Tuned Notched Band Rejection Based on CRLH Transmission-Line Unit Cell

Ouf¹,

Mohra²,

Abdallah³

et al. 2017

PIER Letters

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Abstract-The proposed filter satisfies the Federal Communications Commission ultra-wideband (FCC-UWB) specifications and also creates and controls sharp rejection notch-bands within the filter's passband in order to provide interference immunity from unwanted radio signals, such as wireless local area networks (WLAN) and worldwide interoperability for microwave access (WIMAX) that cohabit within the UWB spectrum. This filter is based on CRLH concept consisting of an asymmetric transmission line unit cell with a short circuited inductive stub to realize high performance in an operation band from 3.1 to 10.6 GHz with a very compact size of 16.4 mm × 5.0 mm. The main advantage of the proposed filter is that four notch frequencies are tuned in the UWB frequency band. The notch frequencies of the filter can be changed by increasing the length of the coupling stub which is controlled by using switching matrix equipment (Mini Circuit) instead of PIN diodes. To validate the design theory, a microstrip UWB BPF with four notch bands centered at frequencies 6.18, 5.9, 5.7, and 5.5 GHz is designed and fabricated.

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“…One of the possible and effective solutions for this problem is to realise reconfigurable narrow rejection bands (notches) within the passband of UWB bandpass filters. For this purpose various techniques can be employed; such as applying a slot resonator [7] or a terminated cross-shaped resonator [8] or by using pin diodes [9] and [10]. However, in this paper, the concept, method and modelling of Graphene based switches for reconfiguring/controlling a WLAN notch in an UWB filter is presented.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable WLAN Notch for UWB filters

Ahmad¹,

Budimir²

2014

2014 9th European Microwave Integrated Circuit Conference

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show abstract

Design of Ultra-Wideband Bandpass Filters With Fixed and Reconfigurable Notch Bands Using Terminated Cross-Shaped Resonators

Cited by 70 publications

References 29 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

Ultra-Wideband Bandpass Filter With Sharp Tuned Notched Band Rejection Based on CRLH Transmission-Line Unit Cell

Reconfigurable WLAN Notch for UWB filters

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