Single-Band to Multiband Frequency Transformation for Multiband Filters

García-Lampérez, Alejandro; Salazar-Palma, M.

doi:10.1109/tmtt.2011.2170579

Cited by 59 publications

(37 citation statements)

References 22 publications

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“…6(e) shows an example triple-passband filtering response with second-order equiripple-type transmission bands of comparable bandwidths. Like in other multiband BPF arrangements as the one in [33] that can also be modeled with this coupling-matrix formalism, the feasible maximum spectral separation between the lower and upper passbands is limited here by the bandwidth of the BPF associated with the input-to-output bandpass-type electrical path …”

Section: B Bandpass Filter With Tunable In-band Stopbandsmentioning

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: B Bandpass Filter With Tunable In-band Stopbandsmentioning

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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“…With the rapid growth of multi‐standard wireless communication services, multi‐band communication devices such as filters are strongly required to develop wireless communication systems . A number of works have been reported on dual‐band (DB) RF and microwave filters . However, some of them suffer from relatively large configurations such as the DB stripline filter designed in ref.…”

Section: Introductionmentioning

confidence: 99%

Compact dual‐band bandpass filters with stub resonating lines

Safia¹,

Nedil²,

Yagoub

et al. 2017

Micro & Optical Tech Letters

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Several new compact microstrip dual‐band bandpass filters using admittance inverters and open‐ended resonating stubs are introduced. Operating at the center‐band frequencies of 1.8 and 2.4 GHz, with moderate bandwidth passbands, the proposed devices are suitable for LTE mobile cellular networks and Wi‐Fi technologies. The design procedure includes the use of simple equations to extract the lumped element values of the circuit model. Next, the equivalent distributed layout which consists of 3 admittance inverters and 4 shunt‐connected stubs (two λg/2 and two λg/2) is presented. The design is adjusted to attain further enhancement in the electrical and physical characteristics. These include spurious passband suppression, layout miniaturization, and reduction in the capacitive coupling between stubs. Measured responses are compared with simulated results, and very good agreement is observed. These features make the proposed filters suitable for integration into various microwave planar technologies.

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“…Most of them concern bi-band filters [1][2][3][4][5][6][7], some other ones triband [8][9][10][11], or quad-band filters [12,13], and several works also report on more general methods or synthesis allowing the design of multi-band filters [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Novel N-band tunable resonator based on N-order dual-behavior resonator and tunable capacitors

Fourn

Quendo

Rius

2014

Int. J. Microw. Wireless Technol.

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Novel N-band tunable resonator based on N-order dual-behavior resonator and tunable capacitors erwan fourn 1 , cedric quendo 2 and eric rius 2 An N-band resonator, particularly well-suited for reconfigurability, is presented in this paper together with its synthesis. The resonator is based on the association of an N-band dual-behavior resonator and tunable capacitors. Its topology consists of a parallel association of N + 1 different bandstop structures, each one composed of a stub terminated by a capacitor. N pass bands, separated from each other by a transmission zero, are then obtained. As each bandstop structure independently controls one transmission zero, the use of variable capacitors allows each of them to be tuned independently and then to reconfigure the resonator in terms of transmission zeros and resonant frequencies. After the presentation of the general synthesis, this principle is validated by the realization of a tri-band resonator in microstrip technology.

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Single-Band to Multiband Frequency Transformation for Multiband Filters

Cited by 59 publications

References 22 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

Compact dual‐band bandpass filters with stub resonating lines

Novel N-band tunable resonator based on N-order dual-behavior resonator and tunable capacitors

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