A method of making a ceramic waveguide delay line includes the step of providing several slices or slabs of dielectric material, each including a layer of metal material applied to respective opposed side surfaces thereof. The slices are then fired in an oven to fuse the layers of metal material to the slices. The slices are then stacked together to form a core which is then dried and subsequently fired. An area of metal material is applied to the outer surface of the core. The core is subsequently dried and fired in an oven.