A New Dual-Band Filtering Power Divider Based on a Single Multimode Modified Triangle Patch Resonator

This letter proposes a new design of a dual-band (DB) filtering power divider (FPD) on a single multimode-modified triangle patch resonator. The proposed design leverages the resonant characteristics of an equilateral triangle patch resonator to exploit the TM₁₀, TM₁₁, TM₂₁, and TM₃₀ resonant modes within a single multimode-modified triangle patch resonator, enabling the realization of an FPD with DB operation. To achieve two assumed second-order filtering passbands, a metal via and multiple perturbed slots are introduced, providing flexible control over the resonant mode frequencies. The first passband is formed by the TM₁₀ and TM₁₁ modes, while the second passband is formed by the TM₂₁ and TM₃₀ modes. To ensure in-band isolation for both passbands, two sets of isolation networks are developed. A prototype is designed, fabricated, and measured to validate the proposed method. The measured results demonstrate excellent agreement with the simulated ones.