Compact Microstrip Lowpass Filter with Ultra-Wide Stopband

Rekha, Thulaseedharan Kodiyattuvila; Abdulla, Parosh Aziz; Nisamol, Thevaruparambil Abdulnazer

doi:10.23919/apmc.2018.8617485

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…Compared with the literature in Table II, we can see that the LPFs designed has good passband performance, with return loss higher than 20 dB and insertion loss lower than 0.2dB and 0.3dB. Secondly, compared with the designs in [3], [5], [6], [7], [8], [9], [12], [14], [16], and [18], the design LPFs have high roll-off rate and achieve steep transition characteristics. Thirdly, except for [12], 2-bit LPF in Section IV has a larger RSB than other references, and maintains a 20 dB stopband suppression.…”

Section: Challenging High Performance Lpf With 2-bit Ftsmentioning

confidence: 71%

“…Finally, we use a compact design area to achieve higher performance. 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.…”

Section: Challenging High Performance Lpf With 2-bit Ftsmentioning

confidence: 97%

“…To acquire a wide stopband, multiple cascaded steppedimpedance hairpin resonators are used in [3] and [4], stepped impedance hairpin units with one embedded in the other are considered in [5], and tap-connected steppedimpedance hairpin units with interdigital structure are suggested in [6] and [7]. The improved designs using hairpin resonators do have broadened the stopband to a remarkable extent, which give a highest RSB of 1.529 in [5] and highest roll-off rate  of 79.5 in [7].…”

Section: Introductionmentioning

confidence: 99%

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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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