Small-sized microstrip delay line filters on the substrates with high permittivity

There are considered small-sized microstrip delay line filters on the substrates with permittivity (εr = 92, 36), whose metallic screen is placed at the height, equal to substrate thickness. Filters contain three step resonators, which are placed close to each other with a gap of 0.1–0.2 mm. The basis of delay line filters construction lies in specificities of electromagnetic interaction of closely placed step resonators with closely placed screen and possibility of modification of coupling between non-adjacent resonators. There are represented data of measurement and simulation. Dimensions of a filter on a substrate with εr = 92, was 5×5×2 mm, they are comparable with dimensions of small-sized microwave ceramic filters of one-piece construction, used in portable communication devices. It is shown that a set of technical characteristics makes new delay line filters competitive