Provided an in-line resonator filter (400) comprising a linear array of three or more conductors (410), the linear array comprising:a first pair of adjacent conductors (410(1), 410(2)) having inductive main coupling and oppositely signed capacitive main coupling;a second pair of non-adjacent conductors (410(1) and 410(3)) having inductive cross-coupling, it is an objective of the present application to further allow the altering of the coupling within the resonator filter, and thereby tune the overall transfer function of the resonator filter to be different from the filter's inherent transfer function. The object is achieved by a first tuning element (422(3) and (4)) that extends from a bottom of the ground plane (402) of the in-line resonator filter; anda second tuning element (420) that extends from a top of the ground plane (404) of the in-line resonator filter; wherein:the first and second pairs have one conductor (410(1)) in common; andat least a portion of the oppositely signed capacitive main coupling compensates for at least a portion of the inductive main coupling between the first pair of adjacent conductors (410(1), 410(2)).
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