Mitsubishi Electric Corporation

Kosuke Yasooka

Kazuyoshi Inami

Tomoyuki Unno

A high-frequency package has: a resin substrate; a high-frequency device mounted on a side of a first surface of the resin substrate; a ground surface conductor of a ground potential formed on a second surface of the resin substrate on an opposite side to the first surface; a transmission line for a high-frequency signal formed in an inner layer of the resin substrate; and a ground via of a ground potential formed within the resin substrate. A through hole is formed in the ground surface conductor. The ground via is placed between the transmission line and the through hole.

High-frequency package

In a multilayer substrate, a quasi-coaxial line is formed as a structure for transmitting a high-frequency signal generated by a mounted high-frequency device from an uppermost layer to a lowermost layer to externally output and for transmitting an externally input high-frequency signal from the lowermost layer to the high-frequency device. The quasi-coaxial line has: a central conductor being a vertical through hole via that connects between a metal pattern formed on an upper surface of the uppermost layer and a metal pattern formed on a lower surface of the lowermost layer; and outer conductors being a plurality of interlayer vias that are circularly arranged around the central conductor and connect between two or more layers. Whole or a part of the vertical through hole via is substituted by a capacitor structure formed of conductor pads facing each other without any via.

A high-frequency package includes an MMIC including a signal source and a conductor pattern that is connected to the signal source, a substrate having a signal line and a GND formed thereon and the MMIC mounted thereon, a metal bump for signaling that is formed between the MMIC and the substrate, and connects the conductor pattern of the MMIC and the signal line of the substrate, and a plurality of metal bumps for shielding that are formed between the MMIC and the substrate so as to surround the signal source and the conductor pattern with the metal bump for signaling, where a space between a pair of adjacent metal bumps among the metal bump for signaling and the plurality of metal bumps for shielding is equal to or less than half of a wavelength of an electromagnetic wave generated from the signal source.

Growing community of inventors

Tokyo, Japan

Kosuke Yasooka