An in-line resonator filter (e.g., 400) comprising a linear array of three or more conductors (e.g., 410), the linear array comprising: a first pair of adjacent conductors (e.g., 410 and 410) having inductive main coupling and oppositely signed capacitive main coupling; and a second pair of non-adjacent conductors (e.g., 410 and 410) having inductive cross-coupling, wherein: the first and second pairs have one conductor (e.g., 410) in common; between the second pair of non-adjacent conductors, there is no direct ohmic connection that provides the corresponding inductive cross-coupling; and at 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, wherein each conductor comprises: a high-impedance base (e.g., 412(i)) that is shorted to a bottom ground plane (e.g., 402) of the in-line resonator filter; and a low-impedance, shaped head (e.g., 414(i)) that does not contact a top ground plane (e.g., 404) of the in-line resonator filter; and further comprising one or more conducting connectors (e.g., 418(i)), each connecting the bases of two adjacent conductors. a first pair of adjacent conductors (e.g., 410 and 410) having inductive main coupling and oppositely signed capacitive main coupling; and a second pair of non-adjacent conductors (e.g., 410 and 410) having inductive cross-coupling, wherein: the first and second pairs have one conductor (e.g., 410) in common; between the second pair of non-adjacent conductors, there is no direct ohmic connection that provides the corresponding inductive cross-coupling; and at 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, wherein each conductor comprises: a high-impedance base (e.g., 412(i)) that is shorted to a bottom ground plane (e.g., 402) of the in-line resonator filter; and a low-impedance, shaped head (e.g., 414(i)) that does not contact a top ground plane (e.g., 404) of the in-line resonator filter; and further comprising one or more conducting connectors (e.g., 418(i)), each connecting the bases of two adjacent conductors. the first and second pairs have one conductor (e.g., 410) in common; between the second pair of non-adjacent conductors, there is no direct ohmic connection that provides the corresponding inductive cross-coupling; and at 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, wherein each conductor comprises: a high-impedance base (e.g., 412(i)) that is shorted to a bottom ground plane (e.g., 402) of the in-line resonator filter; and a low-impedance, shaped head (e.g., 414(i)) that does not contact a top ground plane (e.g., 404) of the in-line resonator filter; and a high-impedance base (e.g., 412(i)) that is shorted to a bottom ground plane (e.g., 402) of the in-line resonator filter; and a low-impedance, shaped head (e.g., 414(i)) that does not contact a top ground plane (e.g., 404) of the in-line resonator filter; and further comprising one or more conducting connectors (e.g., 418(i)), each connecting the bases of two adjacent conductors.