Abstract: A microwave bandpass filter for frequencies in the range of 30-3000 MHz comprises a substrate formed from dielectric ceramic sheets fused together and stacked according to a dielectric constant required of the filter capacitors, the plates of which are formed on the substrate. Discrete air core coils, to provide greater frequency selectivity in this particular frequency range, are attached into the circuit on a top surface of the substrate, and a drawn metal can covers the circuitry on the top surface and is soldered to a metallized coating extending over substantially all of the rest of the substrate except for surface mounting lead portions and associated conductive paths. Thus, EMI and RFI shielding is provided by the combination of the metal can and the ground plane of the circuit.

Abstract: An improved capacitor for use in stripline applications which consists of a dielectric material which is plane parallel and has on its two surfaces electrodes forming plates thereof with the width of the dielectric material and the electrodes selected to match the width of the stripline to which the capacitor is to be attached thereby minimizing disturbances and discontinuities in the stripline circuit.