Patent ID: 6191666
Filing Date: 2001-02-20
Classification: H03H

Abstract:
A laminated lowpass filter circuit comprising:(a) a first dielectric substrate layer having substantially planar opposing surfaces;(b) a first groundplane conductor layer disposed on a first one of said opposing surfaces;(c) a first conductor plate comprising a capacitive element disposed on a second one of said opposing surfaces and having a terminal;(d) a second dielectric substrate layer having substantially planar opposing surfaces with a first one of said opposing surfaces of said second dielectric substrate layer being disposed over said first conductor plate;(e) a second conductor plate comprising a capacitive element disposed on a second one of said opposing surfaces of said second dielectric substrate layer and having a terminal;(f) a third dielectric substrate layer having substantially planar opposing surfaces, with a first one of said opposing surfaces of said third dielectric substrate layer being disposed over said second conductor plate;(g) a shielding conductor layer disposed over a second one of said opposing surfaces of said third dielectric substrate layer;(h) a fourth dielectric substrate layer having substantially planar opposing surfaces, with a first one of said opposing surfaces of said fourth dielectric substrate layer being disposed over said shielding conductor layer;(i) a stripline comprising an inductive element disposed on a second one of said opposing surfaces of said fourth dielectric substrate layer and having a first end and a second end;(j) a fifth dielectric substrate layer having substantially planar opposing surfaces, with a first one of said opposing surfaces of said fifth dielectric substrate layer being disposed over said stripline;(k) a second groundplane conductor layer disposed over a second one of said opposing surfaces of said fifth dielectric substrate layer, said first through fifth dielectric substrates, said first and second groundplane conductor layers and said shielding conductor layer being arranged in a stack; and(l) a first side electrode formed on a first side of said stack and a second side electrode formed on a second side of said stack, said terminal of said first conductor plate and said first end of said stripline being connected to said first side electrode, and said terminal of said second conductor plate and said second end of said stripline being connected to said second side electrode, and said first and second side electrodes constituting input and output terminals of said laminated lowpass filter circuit.