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Abstract-A novel, compact, and tunable lithium niobate (LN) planar waveguide loop structure composed of two junction reflectors is proposed for optical and radio frequency signal processing applications. The preliminary device shows a high quality factor of 6 5 10 4 , due to the low propagation loss of the titanium-diffused LN waveguide. The tunability of the loop by electric field is estimated.Index Terms-High quality ( ) factor, lithium niobate (LN) waveguide, resonator, tunable loop.