“…In the recent years, much more passive devices of wideband are intensively investigated and a number of compact wideband filters have been proposed. Especially, using high permittivity substrates are the new research topic, such as Arlon 25FR [1], Al 2 O 3 ceramic [2,3], Al 2 O 3 and 85MZCLT ceramic [4], (Zn 0.9 Mg 0.1 )TiO 3 ceramic [5], Zr 0.8 Sn 0.2 TiO 4 ceramic [6], multilayer liquid crystal polymer [7], MGTA 1.5 NB 0.5 O 6 ceramic [8], Al 2 O 3 and 9MCT-CLT with V 2 O 5 [9], Al 2 O 3 and 0.8(Mg 0.95 Zn 0.05 )TiO 3 -0.2Ca 0.61 Nd 0.26 TiO 3 [10], and Al 2 O 3 and 94MCT þ V 2 O 5 [11] substrates.…”