👉 In physics and engineering, a bolase is a type of nonlinear waveguide. Bolases are used in microstrip filters for achieving high efficiency and stability under different conditions. A microstrip filter consists of a series of strips of material that are sandwiched between two metal plates. The microstrip filter typically has a length from 10 to 200 millimeters, but can be as short as 3 millimeters. Bolases are used in microstrip filters because they allow high frequencies