Design and fabrication of a compact microstrip low-pass filter with ultra-wide stopband and sharp roll-off-rate

Moloudian, Gholamhosein; Dousti, Massoud; Ebrahimi, Amin

doi:10.1080/09205071.2017.1403964

Cited by 13 publications

(11 citation statements)

References 26 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%

“…In general, a limited number of articles has proposed tunable LPFs. Tunable microstrip LPFs with wide stopband, compact size, and wide tuning range are presented in References . A compact tunable LPF with sharp ROF is presented in References .…”

Section: Introductionmentioning

confidence: 99%

“…Tunable microstrip LPFs with wide stopband, compact size, and wide tuning range are presented in References . A compact tunable LPF with sharp ROF is presented in References . Tuning range of the proposed LPF in Reference is from 1.15 to 2.15 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, different variables have been used to achieve and improve these parameters. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] In Reference 2, a compact LPF with wide stopband using defected ground structures (DGS) is presented. In Reference 3, using T-shaped resonator, a compact LPF with a good insertion loss (IL) in the passband and a wide stopband is presented.…”

Section: Introductionmentioning

confidence: 99%

“…With the development of RF/microwave telecommunication systems, the need for tunable filters has been increased. In general, a limited number of articles [12][13][14][15][16][17][18] has proposed tunable LPFs. Tunable microstrip LPFs with wide stopband, compact size, and wide tuning range are presented in References 12,13.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Modified Wilkinson power divider with harmonics suppression and compact size for GSM applications

Moloudian

Rostami

Björninen

2020

Int J RF Microw Comput Aided Eng

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In this article, a modified microstrip Wilkinson power divider with harmonics suppression for GSM communications applications is presented. For low‐pass filter designing, one open stub, one radial resonator, and two rectangular resonators are used. According to results related to insertion losses (|S21| and |S31|), stopband is wide and equal to 7.5 GHz (3.4‐10.9 GHz), under the condition of 20 dB harmonic suppression level. The results show that at the designed frequency of 1.8 GHz, the input return loss (|S11|) and output return losses (|S22| and |S33|) are better than 22 dB, and the isolation between of output ports (|S32|) is better than 30 dB. The size of the proposed power divider is compact and equal to 10.6 × 14.6 mm2. Finally, the proposed power divider was fabricated and the measurement results illustrate a good agreement with simulation results.

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A quad‐band defected microstrip structure loaded bandpass filter for standard GPS , WiFi , WLAN , and WiMAX applications

Shakeri

Dousti

Ghalamkari

2022

Int J RF Mic Comp-Aid Eng

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A quad-band bandpass filter is proposed using a defected microstrip structure (DMS) for GPS, WiFi, WLAN, and WiMAX applications. This filter uses a stub-loaded stepped-impedance resonator (SL-SIR). The proposed filter is fabricated on an RT/Duroid5880 substrate (ε r = 2.2, h = 0.787 mm, tanδ = 0.0009).Then, the LC equivalent circuit of the proposed filter is presented. A 28thorder transfer function is obtained and approximated by 8th-order transfer functions. The results of simulation, measurements and the LC equivalent circuit are in good agreement. The proposed filter operates at 1.6, 2.48, 3.76, and 5.44 GHz. The measured insertion losses are 0.32, 027, 0.51, and 0.41 dB in the four bands, while the return losses are better than 10 dB in all frequency bands. Finally, the proposed filter is compared with other bandpass filters.

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Design and fabrication of a compact microstrip low-pass filter with ultra-wide stopband and sharp roll-off-rate

Cited by 13 publications

References 26 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

Modified Wilkinson power divider with harmonics suppression and compact size for GSM applications

A quad‐band defected microstrip structure loaded bandpass filter for standard GPS , WiFi , WLAN , and WiMAX applications

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