volume | PIER Journals

Abstract

In this paper, a triple-band bandpass filter based on metamaterials and fractal geometry is proposed. The proposed filter is designed based on three concepts. First, Transmission Lines (TLs) function both as feed lines and as resonators at high frequencies. Second, metamaterials open loop 0th iteration Modified-Minkowski resonators are employed for the middle-frequency band. Third, at a lower frequency, in the 1st iteration, Modified-Minkowski resonators are introduced in the space between TLs to optimize space utilization. The proposed filter has been designed at center frequencies 11 GHz, 6 GHz, and 5 GHz by using Rogers RO 4003 substrate with a thickness of 1.5 mm and dielectric constant of 3.5 resulting in an overall size of 32.2 mm × 20.6 mm. The design simulation is performed using CST microwave studio. To validate the results, the proposed filter has been fabricated. A strong correlation between the measured and simulated results confirms the effectiveness of the design. The proposed filter has three bands at 5 GHz, 6 GHz, and 11 GHz with corresponding S₂₁ values of -0.39 dB, -1 dB, and -0.26 dB and a size reduction of 31% compared with conventional Dual-Band Bandpass Filter for wireless applications.

1. Berka, M., T. Islam, S. Das, A. Serhane, M. L. Kumar, and Z. Mahdjoub, "Design of miniaturized dual-band bandpass microstrip filter based on C-shaped metamaterial resonators for RF/microwave applications," Journal of Nano-and Electronic Physics, Vol. 16, No. 4, 04012, 2024.

2. Ieu, Wangshuxing, Dewei Zhang, and Dongfang Zhou, "High-selectivity dual-mode dual-band microstrip bandpass filter with multi-transmission zeros," Electronics Letters, Vol. 53, No. 7, 482-484, 2017.

3. Khani, Shiva, Seyed Vahab AL-Din Makki, Seyed Mohammad Hadi Mousavi, Mohammad Danaie, and Pejman Rezaei, "Adjustable compact dual‐band microstrip bandpass filter using T‐shaped resonators," Microwave and Optical Technology Letters, Vol. 59, No. 12, 2970-2975, 2017.

4. Hammas, Hussain A., "Design of compact multiband microstrip BPF based on fractal open-ring configuration," Engineering and Technology Journal, Vol. 36, No. 8 Part A, 887-890, 2018.

5. Ahmed, Hayder S., Ali J. Salim, and Jawad K. Ali, "A compact dual-band bandstop filter based on fractal microstrip resonators," Progress In Electromagnetics Research Symposium, PIERS, Prague, Czech Republic, Jul. 2015.

6. Ahmed, Hayder S., Jawad K. Ali, Ali J. Salim, and Nasr N. Hussain, "A compact triple band BSF design based on Minkowski fractal Geometry," 2016 18th Mediterranean Electrotechnical Conference (MELECON), 1-5, Lemesos, Cyprus, Apr. 2016.

7. Chakraborty, U., A. Kundu, S. K. Chowdhury, and A. K. Bhattacharjee, "Compact dual-band microstrip antenna for IEEE 802.11 a WLAN application," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 407-410, 2014.

8. Küçükcan, Sezer and Adnan Kaya, "Dual-band microstrip patch antenna design for Wi-Fi applications," Avrupa Bilim ve Teknoloji Dergisi, No. 34, 661-664, 2022.

9. Ali, Imad and Ronald Y. Chang, "Design of dual-band microstrip patch antenna with defected ground plane for modern wireless applications," 2015 IEEE 82nd Vehicular Technology Conference (VTC2015-Fall), 1-5, Boston, MA, USA, Sep. 2015.

10. Ali, Jawad K. and Hadi T. Ziboon, "Design of compact bandpass filters based on fractal defected ground structure (DGS) resonators," Indian Journal of Science and Technology, Vol. 9, No. 39, 1-9, 2016.

11. Ziboon, Hadi T. and Jawad K. Ali, "Compact quad-band BPF design with fractal stepped-impedance ring resonator," ARPN Journal of Engineering and Applied Sciences, Vol. 12, No. 24, 7352-7363, 2017.

12. Ahmed, Hayder S., Ali J. Salim, Mohammed R. Hussan, Hussain A. Hammas, Mahmood T. Yassen, Saad Mutashar, and Jawad K. Ali, "Design of compact dual-mode fractal based microstrip band reject filter," ARPN Journal of Engineering and Applied Sciences, Vol. 13, No. 7, 2395-2399, 2018.

13. Ahmed, Hayder S., Ali J. Salim, Jawad K. Ali, and Mushtaq A. Alqaisy, "A fractal-based dual-mode microstrip bandstop filter for wireless applications," 2016 16th Mediterranean Microwave Symposium (MMS), 1-4, IEEE, 2016.

14. Qing, X. M., Y. W. M. Chia, and J. Sun, "A novel miniaturized microstrip bandpass filter using a meander-line resonator," Microwave and Optical Technology Letters, Vol. 32, No. 4, 319-321, 2002.

15. Su, Guang Yi, Chio Nang Chan, Un Leng Tam, and Kam Weng Tam, "Compact microstrip lowpass filter using a meander-line structure," Microwave and Optical Technology Letters, Vol. 48, No. 7, 1339-1341, 2006.

16. Ahmed, Hayder S., Microwave Ovens Leakage Reduction Using Band-Reject Filter: Applying the Fractal Band-Reject Filter, LAP Lambert Academic Publishing, 2017.

17. Pozar, David M., Microwave engineering, Fourth Editions, University of Massachusetts at Amherst, John Wiley & Sons, Inc, 2012.

18. Thomann, W., B. Isele, and P. Russer, "Characterization of a 90 degrees curved microstrip transmission line in the time-domain and frequency-domain with 3D-TLM-method and measurements," IEEE Antennas and Propagation Society International Symposium 1992 Digest, 658-661, Chicago, IL, USA, Jun. 1992.

19. Nicolson, A. M. and G. F. Ross, "Measurement of the intrinsic properties of materials by time-domain techniques," IEEE Transactions on Instrumentation and Measurement, Vol. 19, No. 4, 377-382, 1970.

20. Weir, William B., "Automatic measurement of complex dielectric constant and permeability at microwave frequencies," Proceedings of the IEEE, Vol. 62, No. 1, 33-36, 1974.

21. Sharma, Swati and Rekha Mehra, "Printed monopole slot antenna inspired by metamaterial unit cell for wireless applications," Optical and Wireless Technologies: Proceedings of OWT 2020, 413-424, 2022.

Mr. Hayder S. Ahmed

Dr. Aqiel Na'ma Almamori