Denis J. - Engineer Position III

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Germany

Experience

Feb 2025 - Present

11 months

Bietigheim-Bissingen, Germany

Consultant

Valeo Schalter und Sensoren GmbH

Design of a passive target simulator for automotive radars (24 and 77GHz bands).

Mar 2024 - Jul 2024

5 months

Nancy, France

Consultant (part-time)

Healtis SAS

Design of a mm-wave sensor for diagnosing skin cancers (24GHz ISM Band, squamous-cell carcinoma).

Sep 2021 - Dec 2021

4 months

Friedrichshafen, Germany

Consultant (part-time)

ZF Friedrichshafen AG

Design of a diode-based RF energy harvester (13.56MHz ISM-band).

Mar 2019 - Jun 2019

4 months

Élancourt, France

Consultant (part-time)

Thales Optronique SA

Broadband matching of graphene-based photodetectors (DC to mm-wave video output).

Feb 2016 - Apr 2016

3 months

Élancourt, France

Consultant (part-time)

Thales Optronique SA

Devised a simple model for a 1D planar photonic waveguide for implementation in a custom software for simulating optical systems.

Jan 2016 - Dec 2024

9 years

Sailauf, Germany

Consultant (part-time)

Magna Electronics Europe GmbH

Design of printed antennae for a mm-wave automotive radar (75-81GHz)
Integration of antennae and ball-grid array ICs into multilayer boards.

Jan 2011 - Dec 2015

5 years

Munich, Germany

Employee

Huawei Technologies Düsseldorf GmbH

Performed a feasibility study and designed diplexers for integration into base station antenna arrays (790-862/880-960MHz and 1800/2100MHz) in microstrip technology and metallised moulded plastic technology
Designed and tested a circular antenna array with switched parasitic monopoles for 360° coverage (2.3-2.7GHz)
Performed the modal analysis of an Ethernet cable (twisted copper pairs) and the connectors, devised test procedures and designed test fixtures for cables and connectors for future 100GB/s communications
Took part to extensive testing
Designed and tested compensation circuits to flatten the loss vs. frequency for twisted pairs (hybrid)
Wrote a Python code for automating the layout of planar baluns for VHF power amplifier (ADS-Momentum)
Investigated the use of power lines for broadband data transmission (Sommerfeld's wire line)
Wrote the code for an in-house simulator for the operation of Hall-effect sensors (production line of Huawei-China)

Mar 1995 - Dec 2010

15 years 10 months

Neuchâtel, Switzerland

Employee

CSEM S.A.

Contributed to the design of a microstrip antenna array for a 24GHz automotive radar
Designed a 25GHz printed bandpass filter
Designed filters, delay networks, matching circuits and high-directivity couplers for a W-CDMA base station (planar circuits)
Designed a single-patch antenna for W-CDMA (Tx-Rx) with dual polarization
Contributed to the RF design of a 24GHz passive RFID (ISM-band) for the prevention of counterfeiting in the luxury clothing industry
Designed, prototyped and tested a low-output impedance buffer amplifier (700-2300MHz) for modulating a laser diode in an FTTX fiber link
Designed a leaky-wave antenna with electronic scanning for an active imager (135-145GHz, substrate integrated waveguide technique)
Designed, prototyped and tested a target simulator for a 24GHz FMCW automotive radar
Laid out tiles and drew chassis for testing RF chips
Performed EM simulations of the receiving performance of a monopulse azimuth discriminator in terms of radome parameters (HFSS)
Designed microstrip antenna arrays for a short-range low-cost anti-collision automotive radar (79GHz)
Contributed to the design of a mm-wave imager for security applications
Designed a stand-alone detector and an integrated coupler-detector in rectangular waveguide form (WR-8 & microstrip on quartz) for LO power monitoring
Designed a broadband detector (C- to Ku-band, microstrip on Al2O3)
Designed coplanar MMIC matched attenuator and mixer (GaAs cold FETs, 0.15μm gatelength) for integration in an LMDS system (36-44GHz LO, IF up to 2.5GHz)
Developed simple transmission line models for microstrip patch antennae
Designed and tested patch antennae based on these models (S-band)
Designed a x14 frequency multiplier chain for an ultra-stable maser clock (100→1400MHz, space qualified) including a circuit for compensating time delay variations versus temperature
Performed the analog design for an active Tx/Rx phased-array antenna demonstrator for an 802.11a
Designed or integrated various RF block components for a PCMCIA card for 802.11a-b: LNA, PA, PA attenuator (PIN diodes), antenna, antenna switch
Designed LTCC diplexers in the 1800-1900MHz range for handsets involving integration of antenna PIN-diode switches, SAW filters & low-order filtering/matching circuitry (up to 13 metal layers)
Wrote software for 3D electromagnetic modelling of transmission line discontinuities (finite difference method)
Modelled a 10GHz bandwidth travelling-wave LiNbO3 optical waveguide modulator
Designed antenna arrays for GSM1800 base stations
Designed GaAs-FET based frequency doublers (S→C-band, hybrids on high εr softboard)
Designed a coplanar Ka-band double-balanced diode mixer (Al2O3)
Worked on linearizers for TWT amplifiers (X & K-band)
Designed LNAs and front-end mixers with multilayer baluns & microstrip filters for a VSAT (11-13GHz, hybrid assemblies on a low-cost substrate)
Implemented a sampling mixer for an X-band frequency synthesizer involving a new multilayer impedance transformer

May 1992 - Feb 1995

2 years 10 months

Paris, France

Hybrid

Employee

Société Anonyme de Télécommunications

Contributed to a balanced amplifier (S-band, hybrid on soft substrate) involving the design of an integrated multilayer coupler
Designed miniature solid state pulsed power sources using Gunn & Impatt diodes in cavities for radar transponders (2 to 70Watt in C-band)
Investigated and tested coplanar waveguide components (attenuators, transitions and power-dividers) for future integration in MMICs
Developed a method for designing the dielectric-covered feed network of a flush-mounted microstrip antenna array (missile’s skin)
Implemented an active stealth technique for ballistic warheads
Contributed to project cost evaluation & proposal preparation to British M.O.D., the French Missile Test Centre, and E.S.A. (Aladin lidar 10.6µm)
Designed microstrip antennae for DECT base stations (1900MHz, FR4 & thermoset substrates) and tested various feed techniques for integration
Developed a multilayer microstrip directional coupler with increased etching tolerance for use in a power control loop
Supervised junior engineers testing chip sets for the RF front end of a new DECT generation
Supervised pre-production and troubleshooting of DECT base stations
Performed board-level design and troubleshooting for DCS (1800MHz) base stations, designing and testing planar filters with tight space requirements

Nov 1986 - Apr 1992

5 years 6 months

Les Ulis, France

Employee

GIGA Instrumentation

Designed sampling mixers (2-18GHz, Al2O3 substrate) and PIN-diode switches (2-18GHz, soft substrate) for frequency control in microwave signal generators
Wrote software to perform frequency mapping for a microwave signal generator
Participated in system design of a portable spectrum analyser
Designed the first stage of a portable spectrum analyser (9kHz–2.3GHz) including switched attenuator bank, input filter and 1st mixer + diplexer
Designed Rotman lenses (planar beam-forming network for antenna arrays) for battlefield electronic surveillance (S-band) using 2D quasi-optics & boundary integrals
Designed front-end circuitry for counter-measures applications from 2 to 18GHz: wideband hybrid LNAs on Al2O3 and microstrip filters on soft substrates