Methods of designing bandpass filters on coupled coaxial resonators

Background. Ultrahigh frequency bandpass filters are widely used in various radio engineering devices. A special place among microwave band-pass filters is occupied by filters that are part of multiplexers, in particular, diplexers used in cellular communication systems. Filter and diplexer designs based on coaxial resonators are widely used in mobile communication systems. Filters on coaxial resonators have a fairly well-developed design and can be used for broadband systems.