Piotr Jedrzejewski

Title: Piotr Jedrzejewski and His Telecommunications Inventions.

Introduction

Piotr Jedrzejewski is an inventor based in Järfälla, Sweden, whose work includes inventions for radio-frequency filtering and telecommunications equipment. He is associated with Telefonaktiebolaget LM Ericsson (publ) and has 3 patents.

Latest Patents

One of Jedrzejewski’s latest inventions is a filter unit for wideband multicarrier frequency-division duplex (FDD) operation. The design connects a multiplexer (MXT) and a filter bank through at least one isolator. The MXT applies an initial band-pass filter to a transmitted signal, while the filter bank applies further filtering before the signal is directed toward an antenna port. The arrangement uses more second-stage band-pass filter structures than first-stage structures.

Another invention is a coaxial resonator with a dielectric tip. It includes a dielectric disc with a hole and two surfaces, with the resonator connected to one surface and a conductive element connected to the other. The disclosed design also describes a filter housing with a lid or cover and a chassis containing cavities for coaxial resonators.

Career Highlights

Jedrzejewski’s listed patent work focuses on components used in telecommunications systems, particularly resonators and filters that process radio-frequency signals. His inventions address signal filtering and the construction of equipment used in wireless transmission.

Collaborations

Jedrzejewski is associated with Telefonaktiebolaget LM Ericsson (publ). His listed coworkers include Christer M. Ahlberg and Uno Henningsson.

Conclusion

Piotr Jedrzejewski’s patent portfolio reflects a focus on practical filtering and resonator technologies for telecommunications, including designs intended for wideband multicarrier operation.