Jonas Långbacka Email & Phone Number

Malmö, Skåne County, Sweden

- Research of refractive and diffractive mmwave dielectric lenses. Focus on thin lenses with good side lobe supression for mass production.- Anti-reflective metasurfaces- EM simulation and prototyping of customer radar integrations with radomes and lenses- EM simulation of IC package antenna designs and PCBs for 60 GHz- RF ASIC EMC simulations for fullfilling stringent CISPR25 requirements

Malmö, Skåne County, Sweden

Acconeer developes a pulsed coherent 60 GHz radar ASIC with integrated antennas which provides high-accuracy millimeter measurements. My main contribution has been on- Development of hardware and software for radar sensor modules and development kits that all reached market: https://www.acconeer.com/products- Developed production test framework GUI in Python for mass production testing of sensor products- Schematics and PCB layout in Altium, Kicad and PADS- PCB and mechanics prototype manufacturing- Characterization of integrated blocks such as PLLs, LNAs and power supplies- ASIC low level SW development- Python-IVI drivers for oscilloscopes and power supplies, see GitHub repo: https://github.com/acconeer/python-ivi- Customer support

Malmo, Sweden

Engineering consultant in RF, antennas and wireless communications.

Lund, Sweden

Design of low power radio modules for DECT, GSM, ZigBee and WLAN applications. Constructed a compact low-cost RF power detector module to be fitted into the factory test rigs for calibrating and testing radio modules.- Evaluated various monolithic RFICs for best dynamic range and simplistic designs- RF input attenuators for handling both conducted (20 dBm) and OTA (-70 dBm) measurements up to 2.4 GHz or more- Design of an op-amp peak detector add-on circuit for estimating bursted peak power for e.g. DECT and GSM.- Completed a working prototype design with lots of hand-on experience with spectrum and network analyzers

Stockholm, Sweden

Design and verification of discrete circuit transmitter modules for 0.7- 2.1 GHz. The modules are to be utilized in multiple 2G/3G/4G base station projects. Main tasks were component selection, link budgets, documentation and statistical analysis of component spread and factory yield loss data.

Lund, Sweden

- Agile RF reference design work with Ericsson’s software-defined radio platforms for 2G/3G/4G mobile applications. Participated in three modem projects that all reached market.- Had a main role in development of robust and fast transmitter calibration algorithms in Python and C, e.g. output power calibration, frequency compensation and active DC offset compensation. Obtained detailed knowledge of RF ASIC transmitter blocks and external front-end components. Used both numerical and statistical methods for optimizing performance and minimizing factory calibration time.- Device characterization of RF front-end components such as power amplifiers, couplers and filters. Lots of experience with spectrum and network analyzers, soldering and circuit debugging.- Worked in cross-functional teams with RF system engineers and firmware programmers. Participated in code reviews, schematic and PCB reviews.- Extensive debugging and optimization of the RFIC feedback receiver firmware used for output power control.- Python scripting for signal processing, optimizing RF parameters and for controlling measurement equipment- Responsible for WCDMA uplink RF performance. Layer 1 integration and 3GPP conformance testing. Specifically took part in integration of RFIC power saving features.

Lund, Sweden

- Participated in customer bring-ups and gave technical presentations during platform demonstrationevents for attracting new customers- Analyzed and solved some challenging customer hardware and firmware issues, factory calibration issues, PA and RFIC bias optimization for WCDMA and LTE uplink- RF ASIC failure analysis of customer complaints- Statistical analysis of volume production performance data

Lund, Sweden

I was part of a team conducting research on small terminal antennas and radio propagation.- Research of resonant structures such as patch, PIFA and meander-line antennas with focus on optimizing physical size versus bandwidth, radiation efficiency and diversity performance. Made antenna prototypes to evaluate the real performance through anechoic chamber measurements.Gained both intuitive and theoretical antenna knowledge as well as EM simulation softwareexperience.- Research project with dielectric resonator antennas in cooperation with university. Project target was to gain understanding how multiple orthogonal resonant modes can be induced within one solid structure to form a compact MIMO antenna. This resulted in a triple-mode dielectric resonator antenna for 2.6 GHz. This project was of particular interest as MIMO dielectric resonator antennas was an untouched research topic. Co-authored an IEEE conference paper and patent.- Conducted and planned an indoor channel sounder measurement campaign to estimate the channel performance of various MIMO antenna arrays. From the channel data, the Shannoncapacity (data throughput) was estimated. Project resulted in an IEEE journal paper.- Performance estimation of mobile handset antennas through anechoic and reverberation chamber measurements, e.g. radiation patterns, efficiency, TIS and TRP.- MATLAB scripting for estimating MIMO performance from radiation pattern data

Master'S Degree, Electromagnetics, Wireless Communications, Mathematics

Mathematics