Oki Electric Industry Co., Ltd.

Akio Hirakawa

Tomokazu Komazaki

Yoshiaki Fujita

Kiyoshi Kurosawa

Hajime Hotta

Hisao Matsukura

Masaki Sugawara

Jiro Utsunomiya

Yasuhiko Kudou

A filter chip lying on an upper surface of a top layer package substrate is connected to an upper surface ground electrode (). The upper ground electrode () and a lower surface ground electrode () are connected to each other via through electrodes (), ground wiring patterns (), first connecting lines (to), and second connecting lines (). The first connecting lines (to) are connected to the ground wiring patterns (), whereas the second connecting lines () are not connected to the ground wiring patterns (), respectively. Owing to the provision of the connecting lines connected to the ground wiring patterns () and the connecting lines unconnected to the ground wiring patterns (), the impedance between a multilayer package substrate and ground can be adjusted.

Duplexer

Composite units of an optical semiconductor device and a supporting substrate are disclosed, in which the rear surface of the optical semiconductor device is provided with one or more electrode patterns and the top surface of the supporting substrate is provided with one or more electrode patterns. The optical semiconductor device and the supporting substrate are fixed to each other by once melting and solidifying one or more solder bumps which intervene between the one or more electrode patterns provided on the rear surface of the optical semiconductor device and the one or more electrode patterns provided on the top surface of the supporting substrate. A good grade of accuracy in the mutual geometric position of the optical semiconductor device and the supporting substrate is obtained in a horizontal direction due to a phenomenon called 'the self alignment results' in this specification, in which a molten metal is inclined to become a ball based on surface tension. Methods for mounting an optical semiconductor device on a supporting substrate with a good grade of accuracy in the mutual geometric position therebetween in the horizontal direction, based on the same technical principle, are also disclosed. To realize the foregoing results, each of the composite units of an optical semiconductor device and supporting substrate in accordance with this invention is given various structures specific to each of them, and each of the methods in accordance with this invention is given various steps or processes specific to each of them.

Composite unit of optical semiconductor device and supporting substrate

Growing community of inventors

Tokyo, Japan

Akio Hirakawa