Symmetrical Quasi-Absorptive RF Bandpass Filters

Gómez‐García, Roberto; Muñoz‐Ferreras, José‐María; Psychogiou, Dimitra

doi:10.1109/tmtt.2019.2895531

Cited by 62 publications

(70 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 (c), respectively. 3) Unlike the distributed branch-line filters in [9] and [32], which are quasi-absorptive in a limited frequency range, the proposed quasi-absorptive coupled lines consist of quarter-wavelength transmission lines and have periodic frequency responses [33]. Fig.…”

Section: B Quasi-absorptive Coupled Lines With Two Absorptive Stubsmentioning

confidence: 99%

“…(b) Distributed absorptive BPF presented in [31]. (c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31]. (d) A comparison of the simulated S 11 between the proposed work and those of [32] and [31].…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…(c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31]. (d) A comparison of the simulated S 11 between the proposed work and those of [32] and [31]. (e)-(g) A comparison of the simulated S 21 between the overall absorptive filter and its bandpass section in [31], [32], and this work.…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…(d) A comparison of the simulated S 11 between the proposed work and those of [32] and [31]. (e)-(g) A comparison of the simulated S 21 between the overall absorptive filter and its bandpass section in [31], [32], and this work. also acknowledged in [30] and [32], is the impractical circuit parameters due to the extremely high transmission-line impedance ratio as well as coupling coefficient of the coupled line sections even for moderate bandwidth.…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…Outside of the passband, the stubs appear as matched load to the ground and contribute to the absorption of out-of-band signals. Compared with other state-of-the-art absorptive filters, particularly [31] and [32], the proposed architecture is the first that realizes a distributed and symmetrical all-band absorptive filter that can be extended to arbitrarily high orders. We validate the proposed concept by demonstrating a set of 2.45-GHz absorptive filters showing 1-, 2-, and 3-pole roll-off characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Wu¹,

Liu²,

Li³

2020

Preprint

View full text Add to dashboard Cite

In this article, we present the first demonstration of distributed and symmetrical all-band quasi-absorptive filters that can be designed to arbitrarily high orders. The proposed quasi-absorptive filter consists of a bandpass section (reflective-type coupled-line filter) and absorptive sections (a matched resistor in series with a shorted quarter-wavelength transmission line). Through a detailed analysis, we show that the absorptive sections not only eliminate out-of-band reflections but also determine the passband bandwidth (BW). As such, the bandpass section mainly determines the out-of-band roll-off and the order of the filter can be arbitrarily increased without affecting the filter BW by cascading more bandpass sections. A set of 2.45-GHz one-, two-, and three-pole quasi-absorptive microstrip bandpass filters are designed and measured. The filters show simultaneous input and output absorption across both the passband and the stopband. Measurement results agree very well with the simulation and validate the proposed design concept.

show abstract

Section: B Quasi-absorptive Coupled Lines With Two Absorptive Stubsmentioning

confidence: 99%

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Wu¹,

Liu²,

Li³

2020

Preprint

View full text Add to dashboard Cite

show abstract

Signal‐interference‐based quasi‐reflectionless bandpass filter for wideband and high‐selectivity

Guo,

Qiu,

Deng

et al. 2024

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryThis paper proposes a wideband quasi‐reflectionless bandpass filter with high‐selectivity based on signal‐interference method. The bandpass filter is composed of a bandpass section and two absorptive sections, which consist of a quarter‐wavelength coupled line and signal‐interfering/resistively loaded path, respectively. The bandpass section mainly performs bandpass filtering characteristics while the absorptive sections are applied to consume the reflected signals. By virtue of rationally setting electric lengths and characteristic impedances of the absorptive section to form signal interference, signal dissipation within a wider frequency range and higher selectivity can be realized. Finally, the quasi‐reflectionless bandpass filter was designed and demonstrated with well‐matched measurement and simulation results. Compared with conventional works, the proposed bandpass filter can simultaneously attain wideband, high‐selectivity, and two‐port quasi‐reflectionless performance within a single‐layer topology and well‐integrated structure owing to the signal‐interference technology. The proposed technique may be extensively applied in the RF front‐end and decreases the effect on the stability of communication systems caused by reflected signal.

show abstract

A q uasi‐analytic synthesis methodology for spiral defected microstrip compact bandstop filters

Mehraban

Masoumi

Safavi‐Naeini

2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

A new quasi-analytical synthesis method is presented for designing spiral defected microstrip structures (DMS). A comprehensive analysis based on circuit models, mathematical relations, and extensive simulations is used to achieve an exact, straightforward, and tunable wide-range frequency design process. The design process benefits of some novel formulas derived based on the overall form of resonance frequency functions and the study of extensive simulations. We used the Levenberg Marquardt Iteration (LMI) algorithm for the derivation of closed-form formulas. The resonance frequency of a spiral DMS called notch frequency can be independently tuned in a large frequency span by employing the proposed method. The designed spiral DMSs and the new synthesis method can be applied to applications such as filters, antennas, amplifiers, and multipliers. The proposed spiral DMS design/synthesis method and the derived closed-form formulas are verified and validated by simulations and fabrication of six filters with different geometries and specifications. A comparison of the simulation and measurement results of the fabricated filters proves the accuracy and validity of the proposed design method and formulas where the relative effort is less than 0.38%. The return loss and group delay of the filters are less than 0.48 dB and 0.5 ns, respectively.

show abstract

Symmetrical Quasi-Absorptive RF Bandpass Filters

Cited by 62 publications

References 20 publications

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Signal‐interference‐based quasi‐reflectionless bandpass filter for wideband and high‐selectivity

A q uasi‐analytic synthesis methodology for spiral defected microstrip compact bandstop filters

Contact Info

Product

Resources

About