Tunable Bandpass and Bandstop Filters Based on Dual-Band Combline Structures

Abunjaileh, Alaa; Hunter, I.C.

doi:10.1109/tmtt.2010.2083950

Cited by 34 publications

(17 citation statements)

References 9 publications

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“…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. On the other hand, it should be noted that most of the prior-art dual-functionality filtering power dividers have restricted their operation to frequency-static transfer functions [23]- [27].…”

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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“…Finally, advances are being made in the design of microwave filters which can further attenuate out-of-band energy, as well as providing low insertion loss and high power handling capability [16][17][18]. IV.…”

Section: Radar Transmitter Spectral Puritymentioning

confidence: 99%

The challenge of spectrum engineering

Griffiths

2014

2014 11th European Radar Conference

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“…And in order to operate in a wider frequency range, the tunable bandpass filter with a tunable transmission zero in the pass band was attracted more attentions. [1][2][3][4][5][6][7][8][9][10][11] There are mainly three methods to realize a tunable bandpass filter with tunable transmission zeros in the pass band. Firstly, the combination of a bandpass filter and a bandstop filter can achieve this performance.…”

Section: Introductionmentioning

confidence: 99%

A compact tunable bandpass filter with tunable transmission zeros in the pass band adopting a nested open ring resonator

Zhang

Chen²,

et al. 2018

Int J RF Microw Comput Aided Eng

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In order to suppress the high level interference signals in the passband of a wideband communication system, a tunable bandpass filter with tunable transmission zeros in the pass band is presented in this letter. The tunable nested open ring resonator is operated to achieve the tunable transmission zeros in the tunable pass band. Adopting the nested open ring resonators, the passband and the transmission zeros can also be designed according to the demand independently. A tunable bandpass filter adopting five nested open ring resonators is designed, fabricated and measured. The tunable filter is tuning in the range of 400‐530 MHz. The 3 dB bandwidth of the tunable filter is in the range of 17‐18 MHz. The simulated results are in good agreement with the measured ones.

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Tunable Bandpass and Bandstop Filters Based on Dual-Band Combline Structures

Cited by 34 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

The challenge of spectrum engineering

A compact tunable bandpass filter with tunable transmission zeros in the pass band adopting a nested open ring resonator

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