آمار

تعداد نشریات13
تعداد شماره‌ها237
تعداد مقالات2,406
تعداد مشاهده مقاله3,888,040
تعداد دریافت فایل اصل مقاله2,826,467
Yousefi Moghadam, F., Afzali, B., Nadi, F., Zallbeygi, R.. (1396). Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator. فناوری آموزش, 6(1), 25-31. doi: 10.22061/jecei.2018.801
F. Yousefi Moghadam; B. Afzali; F. Nadi; R. Zallbeygi. "Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator". فناوری آموزش, 6, 1, 1396, 25-31. doi: 10.22061/jecei.2018.801
Yousefi Moghadam, F., Afzali, B., Nadi, F., Zallbeygi, R.. (1396). 'Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator', فناوری آموزش, 6(1), pp. 25-31. doi: 10.22061/jecei.2018.801
Yousefi Moghadam, F., Afzali, B., Nadi, F., Zallbeygi, R.. Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator. فناوری آموزش, 1396; 6(1): 25-31. doi: 10.22061/jecei.2018.801

Compact Low Pass Filter Using Sharp Roll-off Ultra-Wide Stopband T-shaped Resonator

Journal of Electrical and Computer Engineering Innovations (JECEI)
مقاله 5، دوره 6، شماره 1، فروردین 2018، صفحه 25-31    اصل مقاله (1.21 M)
نوع مقاله: Original Research Paper
شناسه دیجیتال (DOI): 10.22061/jecei.2018.801
نویسندگان
F. Yousefi Moghadam* ؛ B. Afzali؛ F. Nadi؛ R. Zallbeygi
Department of Electrical Engineering, Faculty of Technical and Vocational No.2, Kermanshah Branch, Technical and Vocational University (TVU), Kermanshah, Iran.
تاریخ دریافت: 21 اسفند 1395،  تاریخ بازنگری: 22 تیر 1396،  تاریخ پذیرش: 22 آبان 1396 
چکیده
Background and Objectives: In this paper, an ultra-wide stopband microstrip low pass filter (LPF) with sharp roll-off and compact size is designed and fabricated. Also, proposed filter is designed, simulated, optimized, fabricated and measured and we can see a good agreement between the simulations and measurement results.
Methods: T-shaped and stepped impedance have been used, because these structures have a very small dimensions. This method provides a suitable cut off frequency.
Results: The cut off frequency at -3dB is 3.1GHz. In the proposed structure, the insertion loss is lower than 0.12dB and the return loss is greater than 15dB. In order to achieve a -20dB attenuation level in the stopband, a modified L-shaped structure is utilized.  This filter has an ultra-wide stopband that is expanded from 3.37GHz to 37.5GHz. Also, the suppression level is greater than -20dB. The fabricated LPF has a size about 16.6 × 13.5 mm2 which is equal to 0.28ƛg × 0.22ƛg, where ƛg is the guided wavelength at 3.1GHz, which is very small.
Conclusion: A microstrip LPF with 3.1GHz cut-off frequency consisting of T-shaped and stepped impedance resonators has been proposed, simulated and fabricated. The transition band (-3 to -40dB) is 0.38GHz, which is a very sharp response. The stopband of the proposed filter is from 3.37 to 37.5 GHz which is equal to 12.1fc. There was a significant agreement between the simulation and the measured results. With all these features, these filters are widely used in wireless communication systems.


======================================================================================================
Copyrights
©2018 The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, as long as the original authors and source are cited. No permission is required from the authors or the publishers.
======================================================================================================
کلیدواژه‌ها
Microstrip filter؛ Low pass filter؛ Sharp roll-off؛ Ultra wide stopband؛ T-shaped structure
مراجع

[1] D. M. Pozar, Microwave Engineering, Wiley, New York, 2005.

[2] J. S. Hong, M. J. Lancaster, Microstrip Filters for RF/Microwave Applications. New York: Wiley, 2001.

[3] M. Hayati, F. Shama, , H. Abbasi, “Compact microstrip lowpass filter with wide stopband and sharp roll-off using tapered resonator,” International Journal of Electronics, 100(12): 1751-1759, 2013.

[4] S. Jiang, J. Xu, “Compact microstrip lowpass filter with ultra-wide stopband based on dual-plane structure,” Electronics Letters, 53(9): 607-609, 2017

[5] P. M. Raphika, P. Abdulla, , P. M. Jasmine, “Planar elliptic function lowpass filter with sharp roll-off and wide stopband,” Microwave and Optical Technology Letters, 58(1): 133-136, 2016.

[6] F. Wei, L. Chen, , X. W. Shi, “Compact lowpass filter based on coupled-line hairpin unit,” Electronics Letters, 48(7): 379-381, 2012.

[7] M. Hayati, M. Ekhteraei, , F. Shama, “Compact lowpass filter with flat group delay using lattice-shaped resonator,” Electronics Letters, 53(7): 475 – 476, 2017.

[8] A. Sheikhi, A.  Alipour, , H. Hemesi, “Design of microstrip wide stopband lowpass filter with lumped equivalent circuit,” Electronics Letters, 53(21): 1416-1418, 2017.

[9] L. Kumar, M. S. Parihar, “Compact hexagonal shape elliptical lowpass filter with wide stop band,” IEEE Microwave and Wireless Components Letters, 26(12): 978-980, 2016.

[10] H. Sariri, Z. Rahmani, A. Lalbakhsh, , S. Majidifar, “Compact LPF using T-shaped resonator,” Frequenz, 67(1–2): 17–20, 2013.

[11] V. K. Velidi, S. Sanyal, “Sharp roll-off lowpassfilter with wide stopband using stub-loaded coupled-line hairpin unit,” IEEE Microwave and Wireless Components Letters, 21(6): 301–303, 2011.

[12] A. Faraghi, M. Ojaroudi, N. Ghadimi, “Compact microstrip low-pass filterwith sharp selection characteristics using triple novel defected structures for UWB applications,” Microw. Opt. Technol. Lett., 56(4): 1007–1010, 2014.

[13] X. Chen, L. Zhang, Y. Peng, Y. Leng, , H. Lu, Z. Zheng,  “Compact lowpass filter with wide stopband bandwidth,” Microw.Opt. Technol. Lett., 57(2): 367–371, 2015.

[14] P. M. Raphika, P. Abdulla, P. M. Jasmine, “Compact lowpass filter with a sharproll-off using patch resonators,” Microw. Opt. Technol. Lett., 56(11): 2534–2536, 2014.

[15] H. L. Cao, W. B. Ying, H. Li, S. Z. Yang, “Compact lowpass filter with ultra-wide stopband rejection using meandered-slot dumbbell resonator,” J. Electromagn. Waves Appl., 26(17-18): 2203– 2210, 2012.

آمار
تعداد مشاهده مقاله: 2,731
تعداد دریافت فایل اصل مقاله: 1,259


سامانه مدیریت نشریات علمی. طراحی و پیاده سازی از سیناوب