STDES-ST87M01IGN

概要

The STDES-ST87M01IGN is a reference design for the ST87M01 NB‑IoT + GNSS module, implemented on a 2‑layer FR4 PCB (90 mm x 60 mm, 1.6 mm).

It simplifies the development of NB‑IoT/GNSS systems by using compact IGNION chip antennas and a layout already optimized for RF performance.

The STDES-ST87M01IGN integrates the ST87M01 module, the NN03‑310 chip antenna for NB‑IoT and the NN03‑320 chip antenna for GNSS, together with their dedicated RF matching networks optimized for different NB‑IoT band groupings.

The layout has been carefully engineered to ensure signal integrity and robust RF behavior, thanks to a wide ground plane, 50 Ω CPWG transmission lines, antenna clearance zones and keepout areas, and close placement of matching components to the antenna feeds.

The STDES-ST87M01IGN includes all necessary functions for fast evaluation: USB or battery powering, low‑noise voltage regulation, USB‑to‑UART interface, SIM holder, reset button, status LEDs, and accessible test points.

The RF behavior has been characterized both in passive mode (return loss, efficiency, maximum gain, 2D/3D radiation patterns) and in active mode through total radiated power (TRP) measurements, showing good alignment with expected values across supported bands.

The NN03‑310 antenna enables operation in the 2.4 GHz Wi‑Fi band for Wi‑Fi scanning (a feature of the ST87M01 module). This allows the board to detect nearby Wi‑Fi access points and support coarse positioning (for example, when GNSS is unavailable), making the STDES-ST87M01IGN an ideal platform to accelerate the design of compact, multiband, high‑efficiency IoT applications with integrated GNSS/Wi‑Fi assisted positioning.