Nokia Corporation

Ilpo Kokkonen

Olli Salmela

Jari Kolehmainen

The idea of the invention is to form a cavity in a multilayer substrate at the point of the structure to be trimmed. This enables the embedding of tolerance critical components inside substrates, such as printed circuit boards, modules, and sub-systems. Trimming is done through the cavity using, for example, a laser. After trimming the cavity is easy to fill in with a suitable dielectric material, or to cover otherwise, e.g. by using a lid, or to leave the cavity uncovered.

Trimming of embedded structures

The idea of the invention is to fabricate a multilayer coaxial transmission line into a printed circuit. The outermost conductor is fabricated by conductive strips in different layers, using conductive via posts in isolation layers connecting the strips. The innermost conductor can be a single conductive strip or multi strips in different layers connected together through conductive via posts.

Waveguide in multilayer structures and resonator formed therefrom

The invention relates to a power management arrangement which comprises, formed as a multilayer structure (), several insulating layers (); several conductive layers () functioning as reference planes; a first port (), a second port () and a third port (); a first transmission line () from the first port () to the second port (), a second transmission line () from the first port () to the third port (); means () for connecting the transmission lines () to the ports (); and at least one passive element () between the second and the third port (). In the presented power management arrangement, the first transmission line () is in an insulating layer () other than the one where the second transmission line () is.

Power divider/combiner with a multilayer structure

The idea of the invention is to fabricate a multilayer coaxial transmission line into a printed circuit. The outermost conductor is fabricated by conductive conduit strips in different layers, using conductive via posts in isolation layers connecting the strips. The innermost conductor can be a single conductive strip or multiple strips in different layers connected together through conductive via posts.

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Oulu, Finland

Ilpo Kokkonen