Compact Dual-Band Crossover with Enhanced Band Ratio Using Interdigital Capacitor for 5G Applications

This research paper introduces a compact dual-band crossover optimized for the lower 5G frequency of 0.7 GHz and 3.5 GHz. The design utilizes T-shaped transmission lines (TLs) with folded arms and stubs to reduce size and integrates metamaterial (MTM) structures with Interdigital capacitor (IDC) unit cells, achieving an impressive 84% size reduction. The crossover operates on a Rogers RT5880 substrate and is simulated using CST-MW Studio.