IoT M2M blog

The home of free hints and tips about wireless IoT / M2M

IoT-University

Why to use NB-IoT instead of LoRaWAN or Sigfox?

Why NB-IoT instead or LoRaWAN and Sigfox

Why now NB-IoT instead of LoRaWAN or Sigfox? There are hundreds of reasons for NB-IoT and hundreds against LoRaWAN and Sigfox. Below is a typical example. The potential customer already prefers NB-IoT and we can deliver NB-IoT with fallback to GSM. In Germany there is no Sigfox Indoor in my city. In the three neighbouring […]

LPWAN gateway on a farm in Australia – diffraction of radio wave

LPWAN with diffraction in detail

When a rectilinear radio wave hits an edge, it changes its course. This effect is called diffraction. By diffraction, we understand a bending effect during the propagation of electromagnetic and acoustic waves. The diffraction causes a change from the straight-line propagation of the waves and occurs at obstructions, mountains or buildings. A simple, free simulation […]

LPWAN gateway in the middle of the North Sea – Fresnel zone

LPWAN Helgoland radio link on 169 m and 1 m mast

Low frequencies in the 900 MHz range are a blessing and a curse for LPWAN. The low frequencies spread further in the open field and penetrate the walls of buildings better. But the curse of the low frequencies is the much wider Fresnel zone. To ensure undisturbed transmission, the space between the transmitter and receiver […]

Antenna Return Loss by VNA

Antenna Return Loss by VNA

The upper left graph illustrates the measurement of a filter with two ports at the Vector Network Analyser (VNA). Port 1 is feeding the device under test and is measuring the reflection. Port 2 is measuring the received energy. The lower right graph is showing a typical return loss measurement of an antenna. Has this […]

Harald Naumann © 2014 Frontier Theme