Methods of designing bandpass filters on coupled coaxial resonators

Abstract

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. Aim. Currently, the design of filters and diplexers on coaxial resonators continues to be improved in terms of improving manufacturing and assembly technology. Methods. The method of equivalent circuits, communication matrices. Results. The principles of constructing filters on coupled coaxial resonators are considered. The methods of obtaining a given shape of the amplitude-frequency response of the filter are analyzed. Conclusion. A method for designing transfer functions and synthesizing prototypes of filter circuits with Chebyshev characteristics is considered.

Keywords

• bandpass filters
• coaxial resonator
• amplitude-frequency response
• coupling matrix