Microwave circuit
AssigneeKoninklijke Philips Electronics N.V.
InventorsChristopher M. Buck, Keith R. Williams
Life of this patent
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Abstract
A microwave circuit comprises a printed circuit board (PCB) on which is fabricated a circuit including passive components such as filters (40) formed by printed conductive patterns. In order to enhance the performance of the circuit, selected components such as filters are made with a greater precision on substrate material (41), such as alumina, having a higher dielectric constant than that of the printed circuit board material. The finished component is mounted on the printed circuit board and the conductive pattern is connected by wire bonds (48, 50) to microstrip tracks (51) of the printed circuit board.
Claims8
A circuit-board assembly comprising:
- a first planar circuit-board having a surface and including:
- a first planar dielectric substrate;
- and a planar first circuit layer at the surface of the first circuit-board, the first circuit layer being a passive microwave circuit;
- a second planar circuit-board having a surface to which the first planar circuit-board is connected, the second planar circuit-board including:
- an electrically conductive ground layer;
- a second circuit layer at the surface of the second planar circuit-board;
- and
- a second dielectric substrate between the ground layer and the second circuit layer, the second dielectric substrate having a through hole, the dielectric constant of the second dielectric substrate being less than about half the dielectric constant of the first dielectric substrate;
- and
- the assembly further comprising an electrical interconnection extending between the first circuit layer and the second circuit layer.
Dependencies are inferred from the claim text.