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A compact third-order triplexer using a common lumped-element triple-mode resonator (LE-TMR) and  LC  resonators is presented in this paper. Every channel of proposed third-order triplexer has three resonant modes, i. e. one resonant mode from the common LE-TMR and another two resonant modes from two  LC  resonators. Step-to-step design procedure is given to guide the third-order triplexer design. As an example, a 0.9/1.8/3.5 GHz third-order triplexer with ripple bandwidths of 150/210/290 MHz is designed, fabricated and measured. The fabricated third-order triplexer has a compact circuit size of 0.163λ g  × 0.104λ g , and high electrical performance can be also acquired.

A Compact Third-Order Triplexer Using Common Lumped-Element Triple-Mode Resonator