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Implementation of Compact LPF Utilizing Defected Structures and Surface Mount Capacitor for Low Insertion Loss and Elliptic Characteristics
Progress In Electromagnetics Research M, Vol. 68, 21-29, 2018
Compact size microstrip low-pass filters with sharp cutoff characteristics, narrow passband, low insertion loss, high attenuation in stopband, and low cost are highly required in modern wireless communication systems. They are used to suppress the unwanted harmonics and noise caused by Radio Frequency (RF) front ends. In this paper, a new design for compact microstrip LPF is proposed. It is based on utilization of Stepped Impedance Resonators (SIR), Defected Microstrip Structure (DMS), Dumbbell-shaped Defected Ground Structure (DB-DGS), and surface mount capacitor. The filter is realized on an F4B-2 substrate with εr=2.65, thickness h=0.5 mm and loss tangent δ=0.0013. The design is carried out using CST-Microwave Studio software. The equivalent circuit of the filter is analyzed and presented using ADS2006A software. The filter exhibits sharp cutoff frequency fc=1.7654 GHz, wide stopband from 1.7654 GHz to 7 GHz with |S21| less than -10 dB, insertion loss less than 0.15 dB in passband, and reduced size compared to the traditional LPF.
Alaa Mohammed Abada, Amr Hussein Hussein Abdullah, and Mohmoud Ahmed Attia Ali, "Implementation of Compact LPF Utilizing Defected Structures and Surface Mount Capacitor for Low Insertion Loss and Elliptic Characteristics," Progress In Electromagnetics Research M, Vol. 68, 21-29, 2018.

1. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley and Sons, New York, 2001.

2. Xi, D., Y.-Z. Yin, L.-H. Wen, Y. Mo, and Y. Wang, "A compact low-pass filter with sharp cut-off and low insertion loss characteristic using novel defected ground structure," Progress In Electromagnetics Research Letters, Vol. 17, 133-143, 2010.

3. Al-Din Makki, S. V., A. Ahmadi, S. Majidifar, H. Sariri, and Z. Rahmani, "Sharp response microstrip LPF using folded stepped impedance open stubs," Radio Engineering, Vol. 22, 328-332, 2013.

4. Mukesh, K. K., K. K. Binod, and K. Sachin, "Defected ground structure: fundamentals, analysis, and applications in modern wireless trends," Hindawi International Journal of Antennas and Propagation, Vol. 2017, 1-23, 2017.

5. Kumar, A., H. Alavi, J. A. Mix, E. C. Beltran, E. C. Perez, A. J. Vera, and H. V. Cruz, "Design of nine pole microstrip low pass filter with metal loaded defected ground structure," IEEE MTT-S Latin America Microwave Conference (LAMC-2016), 12-14, Puerto Vallarta, Mexico, 2016.

6. Ning, J., L. Chen, C. Zeng, and S. Bu, "A compact elliptic-function low-pass filter using stepped-impedance coupled microstrip resonators," IEEE Microwave, 1557-1562, 2014.

7. Belbachir, A. K., M. Boussouis, and N. Amar Touhami, "High-performance LPF using coupled C-shape DGS and radial stub resonators for microwave mixer," Progress In Electromagnetics Research Letters, Vol. 58, 97-103, 2016.

8. Arjun, K. and M. V. Kartikeyan, "Design and realization of microstrip filters with new defected ground structure (DGS)," Engineering Science and Technology, An International Journal, Vol. 20, 679-686, 2017.

9. Mondal, P., H. Dey, and S. K. Parui, "Design of microstrip lowpass filter in combination with defected ground and defected microstrip structures," Computational Advancement in Communication Circuits and Systems, Lecture Notes in Electrical Engineering, Vol. 335, 61-66, Springer, New Delhi, 2015.

10. Ahmed, B., A. I. Ahmed, and P. B. Edmund, "Design of a novel ultrawide stopband lowpass filter using a DMS-DGS technique for radar applications," International Journal of Microwave Science and Technology Hindawi Publishing Corporation, Vol. 2015, 1-7, 2015.

11. Packiaraj, D., K. J. Vinoy, M. Ramesh, and A. T. Kalghatgi, "Design of compact low pass filter with wide stop band using tri-section stepped impedance resonator," Int. J. Electron. Commun. (AEÜ), Vol. 65, 1012-1014, 2011.

12. Kumud, R. J. and R. Manish, "Modification in microstrip low pass filter using bulb shape patch," Int. J. Electron. Commun. (AEÜ), Vol. 63, 1076-1079, 2009.

13. Zhang, P. and M. Li, "A novel compact microstrip lowpass filter with sharp transition and improved stopband," TELKOMNIKA Indonesian Journal of Electrical Engineering, Vol. 13, No. 1, 85-90, 2015.