Introduction
We are excited to announce a partnership with Radientum - Finland's leading antenna, RF, and EMC design consultancy - to streamline wireless hardware development. The two have already worked together successfully across multiple IoT, wearable, and wireless connectivity projects.
Antenna design is one of the most frequent sources of late-stage redesign and certification delays in wireless hardware development - and one of the hardest specializations for product teams to source reliably on their own.
Dedicated expertise in antenna design
Rather than leaving clients to look for specific expertise on their own, Grinn maintains a network of proven specialist partners. Radientum - founded in 2015 by engineers from Nokia's wireless division, with a track record spanning 250+ customers and 1000+ projects across 30+ countries - has now joined this network as a new antenna and RF design partner.
"The value we bring to our clients goes beyond our own engineering capability - it includes knowing when to bring in specialist expertise, and having the right partners in place to do it,” said Grinn CEO, Robert Otręba.
“Together, we help customers reduce risk, accelerate development, and achieve reliable connectivity even in the most challenging environments,” said Radientum CEO, Jukka Sjöstedt.
Industries that benefit
The partnership between Grinn and Radientum addresses antenna and RF design challenges across a wide range of sectors:
Wearables and consumer electronics - compact, body-worn devices with strict form factor constraints and certification requirements
MedTech - patient-worn and point-of-care devices where wireless reliability is safety-critical
Industrial IoT - ruggedized multi-radio hardware operating in electromagnetically noisy environments
Smart City and utilities - deployed sensors requiring efficient, long-range antenna design for field reliability
Satellite and NTN connectivity - applications where antenna performance directly determines service quality at the link level
Agriculture - mobile platforms combining GPS, cellular, and IoT protocols in challenging RF conditions
Proven in the field: the all.u.me project
One of the joint projects between Grinn and Radientum was all.u.me, a Danish personal safety wearable built to blend seamlessly into jewelry. Grinn needed to fit a complete electronics platform - including a Bluetooth Low Energy antenna - into a 1 cm form factor, enclosed in a metallic housing.
Metal enclosures are very challenging for embedded antennas. Grinn led the full hardware and firmware development, including PCB layout optimization and antenna tuning, with Radientum's antenna expertise applied to achieve reliable BLE performance across multiple jewelry variants. The final platform met all regulatory requirements and reached mass production readiness, with sleep-mode power consumption held below 400 nA.
"The ability to know when to reach out for expert assistance is extremely important - to save time and cost for me as the product owner,” said all.u.me Founder, Dorte Caroline Knudsen. “Antenna design is a very specific expertise and we were not in doubt that the Radientum team were the right ones to design an antenna solution that allowed us to optimize performance while keeping the product vision intact. The antenna integration was especially critical due to the compact mechanical design and metal housing. Choosing the right development team with a proven partner network was a key factor in the success of this project."
Read the full all.u.me case study.
Paweł Horbanowicz
