Document Type : Reseach Article
Authors
Department of Electrical Engineering, Faculty of Technical and Vocational No.2, Kermanshah Branch, Technical and Vocational University (TVU), Kermanshah, Iran.
Abstract
In this paper, a novel compact microstrip Low-Pass Filter (LPF) with sharp roll-off and ultra-wide stopband with high suppression level is presented. In the proposed filter, square-shaped resonators are used. The cut-off frequency at 3dB is 1.88GHz. The maximum insertion loss of this filter is less than 0.1dB and the return loss is also less than 16dB in the passband. In the proposed structure, the stopband extends from 2.07 to 29.5 GHz at 24dB level of suppression and is considered as an ultra-wide stopband. There is a significant relationship between simulation and fabrication results, which have justified the functionality of the proposed LFP, respectively.
Keywords
[1] D. M. Pozar, “Microwave Engineering, ” Wiley, New York, 2005.
[2] Hong, J. S. and Lancaster, M. J. “Microstrip Filters for RF/Microwave Applications, ” New York: Wiley, 2001.
[3] S. Jiang, J. Xu, “Compact microstrip lowpass filter with ultra-wide stopband based on dual-plane structure, ” Electronics Letters, Vol. 53(9), pp. 607-609, 2017.
[4] Q. Li, Y. Zhang, Y. Fan, “Compact ultra-wide stopband lowpass filter using multimode resonators, ” Electronics Letters, Vol. 51(14). pp. 1084-1085, 2015.
[5] S. Roshani, “A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells, ” International Journal of Microwave and Wireless Technologies, Vol. 9(5), pp. 1023-1027, 2017.
[6] M. Hayati, M. Ekhteraei, F. Shama, “Compact lowpass filter with flat group delay using lattice-shaped resonator, ” Electronics Letters, Vol. 53 (7), pp. 475 – 476, 2017.
[7] S. Liu, J. Xu, Z. Xu, “Compact lowpass filter with wide stopband using stepped impedance hairpin units, ” Electronics Letters, Vol. 51(1), pp. 67-69, 2015.
[8] L. Kumar, M.S. Parihar, “Compact Hexagonal Shape Elliptical Lowpass Filter With Wide Stop Band, ” IEEE Microwave and Wireless Components Letters, Vol. 26(12), pp. 978-980, 2016.
[9] G. Karimi, A. Lalbakhsh, H. Siahkamari, “Design of sharp roll-off lowpass filter with ultra wide stopband, ” IEEE Microwave and Wireless Components Letters, Vol. 23(6), pp. 303–305, 2013.
[10] M. Hayati, M. Khodadoost, H. Abbasi, “Microstrip lowpass filter with wide stopband and sharp roll-off using modified radial stub resonator, ” International Journal of Microwave and Wireless Technologies, Vol. 9(3), pp. 499-504, 2017.
[11] B, Zhang, S. Li, J. Huang, “Compact lowpass filter with wide stopband using coupled rhombic stubs, ” Electronics Letters, Vol. 51(3), pp. 264-266, 2015.
[12] V.K Velidi, S. Sanyal, “Sharp roll-off low pass filter with wide stopband using stub-loaded coupled-line hairpin unit, ” IEEE Microwave and Wireless Components Letters, Vol. 21(6), pp. 301–303, 2011.
[13] S. Majidifar, “High performance microstrip LPFs using dual taper loaded resonator, ” International Journal for Light and Electron Optics, Vol. 127(6), pp. 3484–3488, 2016.
[14] A. Sheikhi, A. Alipour, H. Hemesi, “Design of microstrip wide stopband lowpass filter with lumped equivalent circuit, ” Electronics Letters, Vol. 53(21), pp. 1416-1418, 2017.
[15] A. Faraghi, M. Ojaroudi, N. Ghadimi, “Compact microstrip low-pass filter with sharp selection characteristics using triple novel defected structures for UWB applications, ” Microwave and Optical Technology Letters, Vol. 56(4), pp.1007–1010, 2014.
[16] S.V Makki, A, Ahmadi, S, Majidifar, H, Sariri, Z. Rahmani, “Sharp Response Microstrip LPF using Folded Stepped Impedance Open Stubs, ” Radio engineering, Vol 22(1), pp. 328-332, 2013.
[17] M. Xiao, G. Sun, X. Li, “A Lowpass Filter With Compact Size and Sharp Roll-Off, ” IEEE Microwave and Wireless Components Letters, 2015, 25(12): 790-792.
[18] M. Hayati, M. Gholami, H.S. Vaziri, T. Zaree, “Design of microstrip lowpass filter with wide stopband and sharp roll-off using hexangular shaped resonator, ” Electronics Letters, Vol. 51(1), pp. 69–71, 2014.
[19] 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, Vol. 58(1), pp. 133-136, 2016.
[20] S. Majidifar, “Design of High Performance Miniaturized Lowpass Filter Using New Approach of Modeling, ” Applied Computational Electromagnetics Society Journal, Vol. 31(1), pp. 52-57, 2016.
[21] F. Wei, L. Chen, X.W. Shi, “Compact lowpass filter based on coupled-line hairpin unit, ” Electronics Letters, Vol. 48(7), pp.379-381, 2012.
[22] H. Sariri, Z. Rahmani, A. Lalbakhsh, S. Majidifar, “Compact LPF using T-shaped resonator, ” Frequenz, Vol. 67(1–2), pp. 17–20, 2013.
[23] A. Kolahi, F. Shama, “Compact microstrip low pass filter with flat group-delay using triangle-shaped resonators, ” International Journal of Electronics and Communications (AEU), Vol. 83, pp. 433-438, 2018.
[24] B. Hiedari, F. Shama, “A harmonics suppressed microstrip cell for integrated applications, ” International Journal of Electronics and Communications (AEU), Vol. 83, pp. 519-522, 2018.
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