Striiv designs high-efficiency wearable device antennas with NI AWR software

March 21, 2017 // By Jean-Pierre Joosting
Located in Redwood City, CA, Striiv is a developer of portable fitness devices and mobile-enabled applications that help users be active and healthy. The company has developed a line of products that automatically monitors personal activity and sleep metrics simply by wearing the tracker.

Striiv required a new integrated, high-performance antenna that would provide better battery life and Bluetooth wireless performance for its next-generation Fusion 2 and Fusion Bio 2 wearable tracker devices. The challenges were that the antenna size had to be small enough to fit in the tiny device package and also had to be inexpensive to produce in quantity, both of which typically limit antenna performance. It was also important to complete the design quickly and get it into prototyping and production design without holding up the schedule, so the design process had to be reliable even though working with physics can be a very uncertain process.

The Striiv design team chose AntSyn™ antenna design, synthesis, and optimization software for the design of a high-efficiency, inexpensive Bluetooth antenna for these latest devices. The initial designs were created in AntSyn in only a matter of days and the final synthesized design was complete in less than two weeks. The synthesized design was also imported into Analyst™ 3D finite-element method EM analysis software, along with the CAD model of the tracker components so in-situ performance could be simulated. The design was scaled and tuned to accommodate the packaging with a prototype ready to go in another week. Tests with the first prototype showed excellent performance and no further design cycles were required, enabling the Striiv team to meet its tight cost and schedule requirements without sacrificing performance. Using the AntSyn synthesized design approach enabled Striiv to receive initial models in just a matter of days, drastically cutting design time.