Improvement of selectivity and suppression level of a microstrip lowpass filter

Malakooti, Seyed-Ali; Mousavi, Seyed Mohammad Hadi

doi:10.1109/apmc.2017.8251529

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The majority of the lowpass filters are the stepped impedance ones, which selectivity is not sharp. In recent years, the microstrip lowpass filters with improved selectivity are reported in literature [27, 28]. According to these literature' data, the best roll‐off rate of the microstrip lowpass filter around the cutoff frequency of 2 GHz is 544dB/GHz, while the measured results of our fabricated filter provide a roll‐off rate of 6000dB/GHz.…”

Section: Computational and Design Examplesmentioning

confidence: 70%

“…According to these literature' data, the best roll‐off rate of the microstrip lowpass filter around the cutoff frequency of 2 GHz is 544dB/GHz, while the measured results of our fabricated filter provide a roll‐off rate of 6000dB/GHz. The out‐of‐band rejection levels in [27, 28] are below 40dB, while our filter has a rejection level of 60dB. The insertion loss at edge frequency was not presented in these literature and bound to be greater than 1.7dB as the microstrip resonator generally has poor unloaded quality factor of around 100 due to its compact size.…”

Section: Computational and Design Examplesmentioning

confidence: 87%

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Three element resonator lowpass filter

Wang

Chen

2023

IET Microwaves Antenna & Prop

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The conventional lowpass prototype filter with the finite transmission zeros close‐to‐band edge often yields negative circuit elements that lead to a practical difficulty of physical realizations. This paper presents an alternative topology of the lowpass prototype filter named three element resonator lowpass filter, which is composed of series inductances and shunt three element resonators. For one‐section three element resonator lowpass filter, the closed‐form solutions of the non‐negative circuit elements are deduced based on its characteristic function recovered from a prescribed transmission zero. For multi‐section one, the associated numerical synthesis procedure using gradient‐based optimization is presented. In physical realization, a much more practical configuration of three element resonator is proven by the equivalent circuit transformation. A synthesis example of lowpass prototype filter with 12 pairs of transmission zeros illustrates the effectiveness of the numerical synthesis method. Also, a design example of five‐section three element resonator lowpass filter, which has a passband up to 1775 MHz, is implemented by the distributed elements based on its prototype circuit of the numerical synthesis. The measured results of the fabricated lowpass filter experimentally validate the prototype filter.

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Section: Computational and Design Examplesmentioning

confidence: 70%

Section: Computational and Design Examplesmentioning

confidence: 87%

Three element resonator lowpass filter

Wang

Chen

2023

IET Microwaves Antenna & Prop

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“…In the last decade, researchers have concentrated on using bandpass filters [8][9][10][11][12][13] and lowpass filters [14][15][16][17][18][19][20][21] as an effective method to produce a high-performance Gysel power divider. In refs.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a miniaturized Gysel power divider using improved T‐shaped resonator

Pahlavani

Moradkhani

Sayadi

2022

Micro & Optical Tech Letters

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A high-performance Gysel power divider showcasing high suppression factor and low insertion loss at 540 MHz has been designed, investigated, and fabricated in this paper. The proposed Gysel power divider is made up of replacing six identical resonators with conventional transmission lines. The proposed resonators, which have been analyzed using LC equivalent circuit analysis, are designed to have a small size, low insertion loss, wide stopband, and narrow transition band. The final tested results have indicated that the suggested power divider is able to suppress nine harmonics; moreover, it has only an insertion loss of 0.4 dB. Another positive feature of the power divider is its small size in comparison with a conventional power divider at this operating frequency, where it occupies 34.5 × 63.8 mm 2 equaling to 0.188 × 0.102 λ g 2 , where λ g is the wavelength guide at 540 MHz. This figure is 25% of a conventional Gysel, considered as a remarkable point.

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Design of an ultra-compact lowpass filter with ultra-sharp roll-off for UHF application

Hsieh

Tsai

2019

IEICE Electron. Express

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This letter proposes a UHF lowpass filter based on the image parameter method. This study designed, fabricated and assembled a 0.48-GHz semilumped lowpass filter using low cost FR4 substrate. It adopted a new layout concept for the air wound coils to achieve the purposes of compact size and good performances. The proposed UHF lowpass filter has the best performances for the roll-off rate and circuit size compared to previous works, and it also achieves the best figure of merit 973,369.

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Improvement of selectivity and suppression level of a microstrip lowpass filter

Cited by 3 publications

References 7 publications

Three element resonator lowpass filter

Three element resonator lowpass filter

Design and fabrication of a miniaturized Gysel power divider using improved T‐shaped resonator

Design of an ultra-compact lowpass filter with ultra-sharp roll-off for UHF application

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