A Multi-Stub Lowpass Filter

Chen, Chih‐Jung; Sung, Chun-Hao; Su, Yin-Drin

doi:10.1109/lmwc.2015.2440773

Cited by 30 publications

(35 citation statements)

References 8 publications

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“…Reference deals with improvement of LPF parameters and includes all regulations associated with filter design. In recent years, different variables have been used to achieve and improve these parameters . In Reference , a compact LPF with wide stopband using defected ground structures (DGS) is presented.…”

Section: Introductionmentioning

confidence: 99%

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Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response

Moloudian

Bahrami

2019

Int J RF Microw Comput Aided Eng

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Tunable microstrip lowpass filters (LPFs) with a good performance are used in most telecommunication systems. In this article, a third‐order circuit with stepped impedance resonator is used to design LPF, and suppression cells are used to improve the performance of the filter in stopbands up to 20 GHz. The −3 dB cut‐off frequency can be controlled in the range of 0.35 to 1 GHz with the tuning range of 96%. Rejection stopbands of 30 dB (type‐I) and 20 dB (type‐II) can be extended to more than 20 GHz. For the passband, the insertion loss variations are in the range of 0.35 to 2.12 dB. The proposed tunable LPF has a sharp roll‐off rate (42‐96 dB/GHz). The varactor‐tuned microstrip LPF is designed, simulated, fabricated, and measured. The results of simulation and measurement for the proposed LPF are in good agreement. The size of the proposed tunable LPF is small and the filter dimensions are equal to 0.267λg × 0.13λg.

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Section: Introductionmentioning

confidence: 99%

“…In Reference , a miniaturized LPF and a bandpass filter (BPF) with an ultrawide stopband is presented. A compact LPF with a good performance using multi stubs is presented in References . A compact LPF with a wide stopband, good IL and return loss (RL) in the passband is presented in Reference .…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response

Moloudian

Bahrami

2019

Int J RF Microw Comput Aided Eng

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“…To meet the stringent bandwidth policies, there is also the demand of a wide stopband harmonic suppressed planar low‐pass filter (LPF) in various applications like microwave amplifier's impedance matching networks. In addition, the LPF also needs to possess the characteristics like the compactness, low pass‐band insertion loss (IL), and the sharp selectivity …”

Section: Introductionmentioning

confidence: 99%

Wide stopband harmonic suppressed low-pass filter with novel DGS

Bhat

Jha

Singh

2017

Int J RF Microw Comput Aided Eng

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In this article, a wide stopband 20 dB harmonically suppressed low‐pass filter (LPF) using novel defected ground structures (DGSs) is proposed. The DGSs has been analyzed as a low pass filter which shows a significant harmonics suppression in the stopband. The lumped parameter equivalent of the DGSs has been developed to show its effectiveness. The modified equivalent circuit model of the filter helps in placing the transmission zero near −3 dB cutoff frequency. The LPF is designed on a 0.10 λg× 0.09 λg substrate size where λg is guided wavelength at −3 dB cut‐off frequency (fc) equal to1 GHz. The simulation shows a 20 dB harmonic suppression up to 50 fc. The prototype of the LPF has been developed and with the available vector network analyser, the S‐parameters have been measured upto 20 GHz (20 fc).The state of the art comparison of the LPF shows a high figure of merit equal to 26 250 which is higher than many recently published works.

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“…Thus, techniques like using modified stepped impedance resonators, transformed shunt stubs, and meandered transmission lines have been studied to realize compact circuit size while enhancing stopband bandwidth . In Ref.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized lowpass filter with wide band rejection using modified stepped-impedance hairpin resonator

Duan

2017

Microw. Opt. Technol. Lett.

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A novel lowpass filter with a miniaturized size of 0.069 λg × 0.087 λg (where λg is the guided wavelength at 0.9 GHz) is presented in this letter. Based on modified stepped‐impedance hairpin resonator cell, a compound resonator structure is proposed by properly arranging two different resonator cells. As a result, miniaturization performance of lowpass filter can be achieved and multiple resonances can be formed in the stopband. Moreover, to further improve its band rejection performance, a pair of compound resonators is symmetrically loaded on the main transmission line, together with an open stub located at its center. Finally, a wide stopband of 13th harmonic suppression can be achieved with 3 dB cutoff frequency at 0.9 GHz. Experiment results show that a relative stopband bandwidth of 158.2% can be realized with a criterion of better than 17 dB suppression degree, which reveal good agreement with simulation ones. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1313–1317, 2017

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A Multi-Stub Lowpass Filter

Cited by 30 publications

References 8 publications

Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response

Design and fabrication of a continuous tunable microstrip lowpass filter with wide stopband and sharp response

Wide stopband harmonic suppressed low-pass filter with novel DGS

Miniaturized lowpass filter with wide band rejection using modified stepped-impedance hairpin resonator

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