Company Filing History:

14 out of 13,651

Murata Manufacturing Co., Ltd.

patents

1 out of 132

Murata Mfg. Co., Ltd.

patents

Years Active: 1990-2011

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15 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7915971 - Nonreciprocal circuit device (2011-03-29),

2. 6853265 - Dielectric resonator device, dielectric filter, dielectric duplexer, and communication apparatus (2005-02-08),

3. 6642816 - Strip-line filter, duplexer, filter device, communication device, and method of adjusting characteristic of strip-line filter (2003-11-04),

4. 6489865 - Strip-line filter, duplexer, filter device, communication device, and method of adjusting characteristic of strip-line filter (2002-12-03),

5. 6356170 - Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof (2002-03-12),

6. 6346867 - Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof (2002-02-12),

7. 6281764 - Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof (2001-08-28),

8. 6255921 - Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof (2001-07-03),

9. 6160463 - Dielectric waveguide resonator, dielectric waveguide filter, and method (2000-12-12),

10. 6133808 - Dielectric filter having input/output electrodes connected to electrodes (2000-10-17),

11. 6020800 - Dielectric waveguide resonator, dielectric waveguide filter, and method (2000-02-01),

12. 6002307 - Dielectric filter and dielectric duplexer (1999-12-14),

13. 6002306 - Dielectric filter and dielectric duplexer each having a plurality of (1999-12-14),

14. 5049842 - Dielectric resonator having a cutout portion for receiving an unitary (1991-09-17),

15. 4902991 - Radio frequency signal combining/sorting device (1990-02-20),

Title: Shigeji Arakawa: Innovator in Nonreciprocal Circuit Devices

Introduction

Shigeji Arakawa is a prominent inventor based in Kanazawa, Japan. He has made significant contributions to the field of electronics, particularly in the development of nonreciprocal circuit devices. With a total of 15 patents to his name, Arakawa's work has had a lasting impact on communication technologies.

Latest Patents

One of Arakawa's latest innovations is a nonreciprocal circuit device. This device features a ferrite-magnet element that includes ferrite with first and second central electrodes intersecting in an insulated manner. Two permanent magnets are arranged to sandwich the ferrite, applying a DC magnetic field. The device also includes a substrate for mounting the ferrite-magnet element and matching circuit elements, along with a flat plate yoke. Additionally, a first resin layer made of cured liquid resin is provided at bonding portions, while a second resin layer made of cured soft sheet-shaped resin is adhered to the rear surface of the flat plate yoke.

Another notable invention is a dielectric resonator device, which consists of a dielectric plate with electrodes on both principal surfaces. This device functions as a three-stage resonator and includes strip lines serving as input/output probes. By integrating the dielectric resonator device with an upper substrate, a dielectric filter is formed, enhancing its functionality in communication applications.

Career Highlights

Throughout his career, Shigeji Arakawa has worked with esteemed companies such as Murata Manufacturing Co., Ltd. and Murata Mfg. Co., Ltd. His expertise in electronic components has positioned him as a key figure in the industry, contributing to advancements in various technologies.

Collaborations

Arakawa has collaborated with notable coworkers, including Kikuo Tsunoda and Tatsuya Tsujiguchi. These partnerships have fostered innovation and have been instrumental in the development of cutting-edge technologies.

Conclusion

Shigeji Arakawa's contributions to the field of electronics, particularly through his innovative patents, have significantly advanced communication technologies. His work continues to inspire future generations of inventors and engineers.

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