Optimized Design and Performance Analysis of a Graded Impedance Microstrip Low-Pass Filter for 6 Ghz Applications

DOI

10.2991/978-94-6463-858-5_178How to use a DOI?

Keywords

Microstrip filter; stepped impedance; low-pass filter; 6 GHz applications; microwave communication; signal attenuation

Abstract

This paper presents the Optimized Design and Performance Analysis of a Graded Impedance Microstrip Low-Pass Filter for 6 GHz microwave applications. The filter is designed using Computer Simulation Technology software and follows a Butterworth response, ensuring a smooth passband with a sharp roll-off. A filter order of N = 7 is selected to optimize performance, achieving a cutoff frequency of 6 GHz with source and load impedances of 50 Ω. The filter exhibits an insertion loss of S₁₂ = − 80 dB, effectively attenuating unwanted high-frequency components. The LPF is fabricated on an FR-4 substrate with a relative dielectric constant (εr) of 4.3, a loss tan δ of 0.02, and a dielectric height of 1.6 mm. The copper conductor layer has a thickness of 0.035 mm. The transmission line dimensions are optimized using the stepped impedance method to achieve the desired frequency response. The filter’s performance is evaluated through full-wave electromagnetic simulations and vector network analyzer (VNA) measurements, analyzing the incident wave reflection coefficient (S₁₁) and forward gain (S₁₂). Simulation results confirm a sharp cutoff at 6 GHz, low return loss, and excellent suppression of higher-order harmonics. The proposed filter is highly suitable for modern microwave communication systems, including radar, satellite, and 6G applications, where efficient low-pass filtering with minimal signal distortion is required.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - R. Prakash
AU  - S. Surya
AU  - S. Pragatheeshwaran
AU  - L. Praveenkumar
AU  - S. Subash
PY  - 2025
DA  - 2025/11/04
TI  - Optimized Design and Performance Analysis of a Graded Impedance Microstrip Low-Pass Filter for 6 Ghz Applications
BT  - Proceedings of International Conference on Computer Science and Communication Engineering (ICCSCE 2025)
PB  - Atlantis Press
SP  - 2137
EP  - 2148
SN  - 2352-538X
UR  - https://doi.org/10.2991/978-94-6463-858-5_178
DO  - 10.2991/978-94-6463-858-5_178
ID  - Prakash2025
ER  -