A filter circuit, comprising: a first filter assembly, comprising a printed wiring board comprising: a first conductive layer comprising a ground plane; a first dielectric layer on the first conductive layer; a second conductive layer on the first dielectric layer; a second dielectric layer on the second conductive layer; and a third conductive layer on the second dielectric layer, the third conductive layer comprising a ground plane; a third dielectric layer on the third conductive layer; a fourth conductive layer on the third dielectric layer, the fourth conductive layer comprising a ground plane; a fourth dielectric layer on the fourth conductive layer; a fifth conductive layer on the fourth dielectric layer; a fifth dielectric layer on the fifth conductive layer; and a sixth conductive layer on the fifth dielectric layer, the sixth conductive layer comprising a ground plane; the second conductive layer comprising: a first distributed element filter having an input and an output; and a second distributed element filter having an input and an output; the first conductive layer further comprising: a first input conductor and a first output conductor, the first input conductor and the first output conductor being connected by respective first and second signal vias through the first dielectric layer to the input and output of the first filter respectively, and a second input conductor and a second output conductor, the second input conductor and the second output conductor being connected by respective third and fourth signal vias through the first dielectric layer to the input and output of the second filter respectively, the ground plane of the first conductive layer having a first cutout for the first input conductor, a second cutout for the first output conductor, a third cutout for the second input conductor and a fourth cutout for the second output conductor, and the fifth conductive layer comprising a third distributed element filter having an input and an output. a first filter assembly, comprising a printed wiring board comprising: a first conductive layer comprising a ground plane; a first dielectric layer on the first conductive layer; a second conductive layer on the first dielectric layer; a second dielectric layer on the second conductive layer; and a third conductive layer on the second dielectric layer, the third conductive layer comprising a ground plane; a third dielectric layer on the third conductive layer; a fourth conductive layer on the third dielectric layer, the fourth conductive layer comprising a ground plane; a fourth dielectric layer on the fourth conductive layer; a fifth conductive layer on the fourth dielectric layer; a fifth dielectric layer on the fifth conductive layer; and a sixth conductive layer on the fifth dielectric layer, the sixth conductive layer comprising a ground plane; a first conductive layer comprising a ground plane; a first dielectric layer on the first conductive layer; a second conductive layer on the first dielectric layer; a second dielectric layer on the second conductive layer; and a third conductive layer on the second dielectric layer, the third conductive layer comprising a ground plane; a third dielectric layer on the third conductive layer; a fourth conductive layer on the third dielectric layer, the fourth conductive layer comprising a ground plane; a fourth dielectric layer on the fourth conductive layer; a fifth conductive layer on the fourth dielectric layer; a fifth dielectric layer on the fifth conductive layer; and a sixth conductive layer on the fifth dielectric layer, the sixth conductive layer comprising a ground plane; the second conductive layer comprising: a first distributed element filter having an input and an output; and a second distributed element filter having an input and an output; a first distributed element filter having an input and an output; and a second distributed element filter having an input and an output; the first conductive layer further comprising: a first input conductor and a first output conductor, the first input conductor and the first output conductor being connected by respective first and second signal vias through the first dielectric layer to the input and output of the first filter respectively, and a second input conductor and a second output conductor, the second input conductor and the second output conductor being connected by respective third and fourth signal vias through the first dielectric layer to the input and output of the second filter respectively, a first input conductor and a first output conductor, the first input conductor and the first output conductor being connected by respective first and second signal vias through the first dielectric layer to the input and output of the first filter respectively, and a second input conductor and a second output conductor, the second input conductor and the second output conductor being connected by respective third and fourth signal vias through the first dielectric layer to the input and output of the second filter respectively, the ground plane of the first conductive layer having a first cutout for the first input conductor, a second cutout for the first output conductor, a third cutout for the second input conductor and a fourth cutout for the second output conductor, and the fifth conductive layer comprising a third distributed element filter having an input and an output.