This article presents the design and analysis of a triband filter for NavIC satellite communications applications. The filter is designed using a Taconic substrate and incorporates an L-shaped stub and an X-shaped stub to achieve precise resonance in three bands. The proposed filter operates effectively at three distinct frequencies viz 1.3 GHz, 1.5 GHz, and 2.6 GHz, providing optimized performance for satellite and GNSS systems along with very good isolation between the bands. Simulation results demonstrate the filter's ability to meet the desired specifications with significant attenuation at out-of-band frequencies. The achieved performance highlights the filter's potential for reliable and efficient use in modern communication systems. Future work will explore enhancements to further improve bandwidth and insertion loss. The structure reported a very good insertion loss of 0.1 dB, 0.3 dB, and 0.64 dB across the three frequency bands, respectively, with a very high selectivity which finds application in NavIC. The input reflection coefficient was well below − 15 dB at L- and S-bands, respectively.