A New Compact Bandpass Filter Design Using Overlapping Resonator for Enhanced 5G Performance

Abstract

As wireless technology has grown at an unprecedented rate and a growing number of users are wanting to create high speed systems. Small, efficient bandpass filters are essential for 5G technology. The present paper provides an innovative methodology for designing a micro-sized bandpass filter operating at 2.4GHz (5G ISM-band). Three types of compact microstrip bandpass filters (BPFs) were developed, including the overlapped resonator filter, the coupled-line filter, and the hairpin filter. The three filter structures are based on a third-order Chebyshev prototype with a 0.1 dB ripple and were implemented and developed in Advanced Design System (ADS) simulator. The simulated results showed that the proposed overlapped resonator filter achieved the lowest insertion loss (-0.001 dB) and the best reflection coefficient (-36.346 dB), compared to the coupled-line filter (insertion loss: -0.009 dB, reflection coefficient: -26.85 dB) and the hairpin filter (insertion loss: -0.005dB, reflection coefficient: -29.77dB). The proposed filter also achieved a more compact size (11.7 x 15.3 mm²) than the others. Superior impedance matching, lower insertion loss, and a substantial reduction in size make the overlapped resonator filter a strong candidate for compact and high-performance 5G front-end systems.

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