Design of Planar Low Pass Filter with Razor-sharp Roll-off

Raphika, P M; Abdulla, Parosh Aziz; Jasmine, P M; Rekha, Thulaseedharan Kodiyattuvila; Ami, Iqbal

doi:10.1109/menacomm46666.2019.8988548

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…Compared with [3], [7], [8], [9], [14], and [15], we achieve better performance of passband, transition band and stopband with a smaller design size. Compare with [10], [11], [13] and [17], 2-bit LPF in IV has higher RSB and higher RL in passband with a smaller design area. Compared with the remaining references [5], [6], [12], [16] and [18], we use the similar or slightly larger size to greatly improve the performance of the transition band.…”

Section: Challenging High Performance Lpf With 2-bit Ftsmentioning

confidence: 99%

“…To yield an ultra-wide stopband, LPF designs take the advantages of transformed open-circuited stubs, which include stepped impedance resonator (SIR) [8], [9] deformed open stubs [10], [11], [12] and combination of various types of resonators [13]. A hexangular unit SIR [8] and T-shaped SIR [9] are proposed to extend the RSB reaching a maximum of 1.61 in [8].…”

Section: Introductionmentioning

confidence: 99%

“…In [12], a multi-stub LPF composed of opencircuited stubs improves the performance in both the transition and stopband regions. The designs with transformed open-circuited stubs yield a highest RSB of 1.74 in [12], highest roll-off rate  of 217 in [11] and 289 in [13], but a large LPF size is needed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Compact Planar Lowpass Filters by Using Fragment-Type Structure With Multi-Bit Scheme

Zhang

Wang

2021

IEEE Access

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A novel design method for compact planar lowpass filter (LPF) with prominent roll-off rate and wide stopband suppression is proposed by using fragment-type structures (FTS) with multi-bit scheme. The proposed multi-bit FTS design has the potential to achieve higher LPF performance at higher optimization efficiency, without any prerequisite knowledge about the pivotal LPF structures needed in conventional LPF designs. The definition of multi-bit FTS and the implementation of LPF design with multi-bit FTS scheme are presented in detail. Compared to the LPF design with 1-bit FTS, the 2-bit FTS design may use smaller decision space, take fewer iterations in multi-objective optimization searching, and yet achieve sharper roll-off rate, higher stopband suppression and a wider stopband. For demonstration, planar LPFs on PCB using the 1-bit FTS and 2-bit FTS are designed and tested. The 2-bit FTS design yields a sharp roll-off rate of 123.3 dB/GHz, a relative stopband bandwidth of 165% referred to stopband suppression of 20 dB, and a high figure-of-merit of 21060. Effects of the geometry parameters of the 2-bit elements are further discussed to give some guide rule on using the 2-bit FTS design.INDEX TERMS Fragment-type structure (FTS), lowpass filter (LPF), roll-off, wide stopband, multi-bit.

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