A compact lowpass filter with ultra-high figure-of-merit for integrating with Class-F/F−1 power amplifiers

Ekhteraei, Milad; Hayati, Mohsen; Shama, Farzin

doi:10.1007/s10470-018-01387-6

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…The result of this study was an ultra‐wide stopband bandwidth filter with a complex and expensive structure. In Ekhteraei et al 10 an LPF was fabricated to apply in the output of Class‐F/F −1 amplifiers to suppress the 2nd to 20th harmonics of 1 GHz. Although this filter has good characteristics, like high stop‐band width and sharp transition band, occupying a large space is the disadvantage of this filter.…”

Section: Introductionmentioning

confidence: 99%

“…A lot of LPFs with different structures were presented in the previous study. [1][2][3][4][5][6][7][8][9][10] In Faraghi et al, 1 a LPF was introduced with a high roll-off rate, but it suffers from low return loss and a complex structure. In Chen et al, 2 the authors presented a filter with good properties like low insertion loss in the passband and an extent stopband, but the gradual transition band is the disadvantage of this study.…”

Section: Introductionmentioning

confidence: 99%

“…The low‐pass filters (LPF) are extensively applied electronic components, so implementing a compact and practical LPF with suitable characteristics is one of the critical topics for researchers. A lot of LPFs with different structures were presented in the previous study 1–10 . In Faraghi et al, 1 a LPF was introduced with a high roll‐off rate, but it suffers from low return loss and a complex structure.…”

Section: Introductionmentioning

confidence: 99%

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A miniaturized filter design approach using GMDH neural networks

Sattari

Hayati

Shama

et al. 2023

Micro & Optical Tech Letters

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A miniaturized microstrip low‐pass filter (LPF) has been designed and fabricated using semicircular‐shaped resonators. The designing procedures as well as the LC equivalent circuit of each step have been reported. Due to the small size of the presented filter, flat group delay in the pass‐band, low insertion loss (IL), and high return loss (RL) in operational frequency. By producing adjusted transmission zeros (TZs), the second to fourth unwanted harmonics were attenuated using the proposed LPF. The machine learning approach has been utilized to adjustment of the filter parameters. The 3 dB cut‐off frequency (Fc), TZs, IL, and RL were predicted using the group method of data handling neural network (GMDHNN). Ninety simulations were performed with different inductor and capacitor values. The collected data were used for neural network training. The GMDHNN can diagnose the efficient inputs, so this feature was applied to determine the efficient L and C elements on TZs, Fc, IL, and RL. Finally, the fabricated filter results are well‐matched with the simulation ones. IL and RL of the suggested filter in operational frequency are −0.09 and −17.26 dB, respectively. The total filter size is only 14.65 mm × 3.5 mm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A miniaturized filter design approach using GMDH neural networks

Sattari

Hayati

Shama

et al. 2023

Micro & Optical Tech Letters

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High-performance class-E power amplifier integrated with a microstrip bandpass-filter for wireless applications

Afzali

Shama

Abbasi

2021

Analog Integr Circ Sig Process

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Ultra-wide stopband lowpass filters using ring resonators

Hayati

Mustafa

Shama

et al. 2021

Int. J. Microw. Wireless Technol.

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A microstrip-based lowpass filter (LPF) containing modified ring structures has been presented. Ring resonators are used to form a sharp transition region. In addition, rectangular- and tapered-shaped suppressing cells are used to create an ultra-wide stopband region. By combining the designed ring resonator and suppressors, an LPF has been designed with −3 dB cut-off frequency at 1.83 GHz. A sharp transition region has been achieved from 1.83 (at −3 dB) to 2.1 GHz (at −60 dB). A stopband region has been concluded from 2 to 21 GHz (with the corresponding attenuation level of at least 20 dB). The measured insertion loss is better than 0.1 dB (equal to a return loss of 18.1 dB) in the passband region. The proposed circuit is fabricated and measured. The measured results have an appropriate adaption with the simulated results.

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A compact lowpass filter with ultra-high figure-of-merit for integrating with Class-F/F−1 power amplifiers

Cited by 4 publications

References 36 publications

A miniaturized filter design approach using GMDH neural networks

A miniaturized filter design approach using GMDH neural networks

High-performance class-E power amplifier integrated with a microstrip bandpass-filter for wireless applications

Ultra-wide stopband lowpass filters using ring resonators

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