Miniature band-pass filter on microstrip resonators

We have developed an original design of the microstrip band-pass filter on two identical resonators, the configuration of which is realized on a substrate with dielectric permittivity ε = 4.4 and thickness h = 1.5 mm. The proposed filter has much smaller dimensions compared to regular microstrip filter constructions. Using a three-dimensional electrodynamic engineering program, we have carried out the filter numerical modeling with an operating frequency of 1,800 MHz and obtained its frequency characteristics. The designed filter dimensions are 16×15×1.5 mm, while the operating frequencies band is 189 MHz.