3. Performance Evaluation and Optimization of Stepped Impedance and Stub-based Low-pass Filters for S-Band Applications 

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Authors:

Naureen Butt, Ayesha Jaffar, Zeeshan Azmat Shaikh.

Abstract 

Wireless Communication is an integral part of modern communication systems. Microwave filters play a vital role in mobile and wireless communication systems. Microwave filters are used in most wireless communication systems having RF-front end for performing various signal processing tasks such as frequency selection, suppression of mixers unwanted intermodulation products etc. This paper presents the optimized design of low-cost microstrip technology based S-band low-pass filters using two different design topologies like: stepped impedance and stub-based filters. Low-pass filters of order N=5 are designed, optimized and simulated using the ADS tool to achieve minimum insertion loss (S21) in pass-band and attenuation greater than 20dB at 3.5GHz.Consequently, optimized filters are manufactured and tested using Vector Network Analyzer (VNA) for S21 parameter of device under test (DUT) . Finally, comparison of post simulation and measured results are carried out for the proposed filters.

Index Terms:

FR-4 substrate, Kuroda’s identities, Microstrip low-pass filter, Richard’s transforms, Stepped impedance

Cite this: Naureen Butt, Ayesha Jaffar, Zeeshan Azmat Shaikh, “ Performance Evaluation and Optimization of Stepped Impedance and Stub-based Low-pass Filters for S-Band Applications  ”, BUJICT Journal, Volume 10,  Issue, II December 2017, pp. 1-5.

References:

[1] Mike Golio, Janet Golio, “RF and Microwave Passive and Active Technologies”, 2nd ed.
[2] Ralph Levy, Richard V.Synder, George Matthae, “Design of Microwave Filters,” IEEE Trans. Microwave Theory and Techniques, vol.50, no. 3, March. 2002
[3] A. Das, A. Roy, K. Roy, A. Bhattacharyya, D. Chowdhury, and S. Paul, “Design and analysis of microwave stepped impedance low pass filter for Bluetooth application,” in 2015 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT), 2015, pp. 1–3.
Page 9 ISSN – 1999-4974
[4] D. M. Pozar, “Microwave Filters,” in Microwave Engineering, 4th ed
[5] S. C. Thierauf, Understanding signal integrity. Boston: Artech House, 2011.
[6] Sudipta Das, S. K. Chowdhury (2012, March). International Journal of Electronics & Communication Technology. 3(1), pp.98-100
Available:http://www.iject.org/vol3issue1/sudipta.pdf
[7] K. Park, K. Kim, J. Lim, and D. Ahn, “A new open stubs structure of Kuroda low-pass filter using DGS,” in Wireless and Microwave Technology Conference, 2009. WAMICON’09. IEEE 10th Annual, 2009, pp. 1–4.
[8] J. S. Hong, M. J. Lancaster “Lowpass and Bandpass filters,” in Microstrip Filters for RF/Microwave Applications.
[9] R. Ludwig, P. Bretchko “An Overview of RF Filter Design,” in RF Circuit Design Theory and Applications, 2nd ed.
[10] T. C. Edwards and M. B. Steer, Foundations for microstrip circuit design, Fourth edition. Chichester, West Sussex, United Kingdom: IEEE Press, Wiley, 2016.
[11] G. Awan and N. A. Sheikh. (2015, Sep-Oct). Science International. .[Online].27(5), pp.4501–4505
Available: http://www.sci-int.com/Search?catid=57
[12] L. G. Maloratsky, “Passive Devices,” in Integrated Microwave Front-ends with Avionics Applications, 2nded
[13] Dhirendra Kumar, Asok Dee. (2011, April.). Journal of Electromagnetic Analysis and Applications. Scientific Research.[Online].3(4),pp.115–117.
Available:http://www.SciRP.org/journal/jemaa.
[14] B. Maity, “Stepped impedance low pass filter using microstrip line for C-band wireless communication,” 2016, pp. 1–4.