Inventor

KOIZUMI DAISUKE

JP27 patents

⚠️ This page may combine multiple inventors who share the name “KOIZUMI DAISUKE”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KOIZUMI DAISUKE

NTT DOCOMO INC

Filter with improved capacitive coupling portion

Variable resonator and variable phase shifter

Coupling structure, resonator excitation structure and filter for coplanar-waveguide circuit

Coplanar waveguide resonator and coplanar waveguide filter using the same

Coplanar resonator and filter using the same

Dual band resonator and dual band filter

Signal switching device

Planar circuit housing

Coplanar waveguide resonator

Signal switching device

FUJITSU LTD

Contactor for testing miniaturized devices and components

Probe card and method of testing wafer having a plurality of semiconductor devices

Electronic component attaching tool

Method of attaching electronic component and electronic component attaching tool

Attachment structure of semiconductor device socket

Probe card and method of testing wafer having a plurality of semiconductor devices

Contactor for electronic components and test method using the same

Contactor having contact electrodes of metal springs embedded in a plate-like structure

Semiconductor substrate test device and method

FUJITSU SEMICONDUCTOR LTD

IC socket with attached electronic component

Contactor and test method using contactor

Component for testing device for electronic component and testing method of the electronic component

KOIZUMI DAISUKE

Tray in combination with electronic component attaching tool attached to the tray

Radio base station apparatus

Radio base station apparatus

FUJITSU MICROELECTRONICS LTD

Contactor for electronic components and test method using the same

NIPPON TELEGRAPH & TELEPHONE

Wireless environment evaluation method and wireless communicaton system