Analysis of higher order Microstrip Filter to Reduce Out-of-Band Emissions

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Manjunatha K H
S. Mehta


In this paper a fifth order wide-band Chebyshev micro-strip filter is designed at 5.2 GHz frequency, where the spectrum contains white spaces. The fifth order is extended to 7th, 9th, 11th, and 13th order and simulated using HFSS EM simulator. Simulation results show that compared to 5th order, the higher order filters provide more and more reduction in out-of-band emissions in increasing order from 5th to 13th order filter. A 13th order filter is fabricated and tested for more reduction in the OOBE by using dumbbell shaped slots as defected ground plane structure. Five such slots are made in the ground plane for better results to reduce more OOBE. This 13th order filer with slots is fabricated and tested. The substrate chosen is FR4 with height 1.6 mm. Here we have given a mathematical treatment for emission mask for OOBE according to ITU recommendations. The designed filter’s transmission characteristics from port 1 to port 2 give good agreement with the recommendations.


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K H, M., & Mehta, S. (2023). Analysis of higher order Microstrip Filter to Reduce Out-of-Band Emissions. Advanced Electromagnetics, 12(1), 11–16.
Research Articles


C. Cordeiro, K. Challapali, D. Birru and Sai Shankar, "IEEE 802.22: the first worldwide wireless standard based on cognitive radios," First IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 2005. DySPAN 2005., Baltimore, MD, USA, 2005, pp. 328-337.

View Article

F. F. Digham, "Joint Power and Channel Allocation for Cognitive Radios," 2008 IEEE Wireless Communications and Networking Conference, Las Vegas, NV, 2008, pp. 882-887, doi: 10.1109/WCNC. 2008.161.

View Article

J. Mitola and G. Q. Maguire, "Cognitive radio: making software radios more personal," in IEEE Personal Communications, vol. 6, no. 4, pp. 13-18, Aug. 1999, doi: 10.1109/98.788210.

View Article

J. Isnard. "Frequency band sharing: utopia or reality? Towards specification of operational scenarios", IEEE Aerospace and Electronic Systems Magazine, 2002.

View Article

Yih-Dar Chen and Chien-Hao Liu, "Unsymmetrical Finger-Shape DGSs for Developing a Compact, High-Order, Harmonic-Suppressed Bandpass Filter', Progress In Electromagnetics Research C, Vol. 90, 253-263, 2019.

View Article 2020. [online] Available at:

<> [Accessed 23 December 2020]. 2020. [online] Available at:

<!!PDF-E.pdf> [Accessed 23 December 2020]. 2020. [online] Available at:

<!!PDF-E.pdf> [Accessed 23 December 2020]. 2020. F.1191: Necessary and Occupied Bandwidths and Unwanted Emissions Of Digital Fixed Service Systems. [online] Available at: <> [Accessed 23 December 2020].

Moustapha El Bakkali et al., "Design of 5.2 GHz Low Noise Amplifier for Wireless LAN", Procedia Manufacturing, Volume 32, 2019, Pages 739-744, ISSN 2351-9789.

View Article

Mudar Aljoumayly et al., "An Essential Part of The Wi-Fi Tri-Band System - 5.2 GHz RF Filters", November 5, 2020, [Online]. Available: design-hub/blog/wifi-5-point-2-ghz-rf-filters [Accessed 28 December 2022].

Leo G. Maloratsky, "Using Modified Microstrip Lines to Improve Circuit Performance", High Frequency Electronics, 2011, page 36-52.

Jia-Sheng Hong, M. J. Lancaster, "Microstrip Filters for RF/Microwave Applications", JOHN WILEY & SONS, INC., ISBNs: 0-471-38877-7 (Hardback); 0-471-22161-9 (Electronic).

Francisco Ary Alves de Souza, Antonio LuizPereira de Siqueira Campos, Alfredo GomesNeto, Alexandre Jean René Serres et al. "Higher Order Mode Attenuation in Microstrip Patch Antenna with DGS H Filter Specification from 5 to 10 GHz Range", Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2020

C. Garg, and M. Kaur, "A review of defected ground structure (DGS) in microwave design," International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering, vol. 2, no. 3, pp 1285-1290, 2014.

Arjun Kumar et al., "A Comparative Study of Microstrip Bandstop Filters Loaded With Various Dumbbell-Shaped Defected Ground Structure (DGS)", International Journal of Microwave and Optical Technology, vol.8, no. 2, pp. 53-60, March 2013.

Prgya Singh and Raghuvir Tomar, "The use of Defected Ground Structures in Designing Microstrip Filters with Enhanced Performance Characteristics", Procedia Technology, vol. 17, 2014, pp. 58-64, ISSN 2212-0173.

View Article

Arjun Kumar, M.V. Kartikeyan, "Design and realization of microstrip filters with new defected ground structure (DGS)", Engineering Science and Technology, an International Journal, Volume 20, Issue 2, 2017, Pages 679-686, ISSN 2215-0986.

View Article

Jang-Sik Yoon et al., "A new DGS resonator and its application to bandpass filter design," 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535), 2004, pp. 1605-1608 Vol.3.

View Article

N. Zhang, Z. Deng, C. Shu and H. Wang, "Design and Analysis of a Tunable Bandpass Filter Employing RF MEMS Capacitors," in IEEE Electron Device Letters, vol. 32, no. 10, pp. 1460-1462, Oct. 2011.

View Article

A. Barzgar and H. Oraizi, "A low profile band pass DGS filter for harmonic suppression," 2017 Sensors Networks Smart and Emerging Technologies (SENSET), 2017, pp. 1-4.

View Article