Filter and tuning element

Filter apparatus

Filter apparatus

Filter apparatus

Filter apparatus and method

Filter apparatus with circulator for use in radio apparatus tran

Filter apparatus, duplexer, and communication apparatus

Filter arrangement

Filter arrangement

Filter arrangement

Filter arrangement for a converter circuit

Filter arrangement for balanced and unbalanced line systems

Filter arrangement including a non-reversible circuit element, a

Filter array having a plurality of capacitance elements

Filter assembly

Filter assembly

Filter assembly and communication apparatus

Filter assembly comprising a plastic resonator support and reson

Filter assembly comprising two bulk wave resonators

Filter assembly insertable into a substrate