An apparatus comprises a radio frequency filter and a dielectric material
configured to alter the frequency response of the RF filter, wherein said
dielectric material is located in proximity to said RF filter. The
apparatus may be useful in a satellite antenna system wherein the RF
filter is configured to have an initial frequency response. The
dielectric material may be configured to shift the frequency response of
the RF filter from the initial frequency response to a shifted frequency
response. The dielectric material may be a polyimide tape. A method is
also provided for reworking a non-compliant PWB, wherein the PWB is
non-compliant with a standard frequency response to a given RF input
signal, and wherein the PWB comprises an RF filter. The method comprises
the step of adjusting the frequency response of the RF filter by adding a
piece of polyimide tape in proximity to the RF filter.