The picture shows 2x IMST iM880B modules on development boards. One has the IMST dipole antenna supplied with the module and the other has a Taoglas PC81.07.0100A.db PCB antenna.
The Taoglas antenna is what Texas Instruments describes as a “meandering monopole” antenna and is often called a PCB trace antenna. Per an earlier posting, PCB trace antennae are among the most “popular” for devices.
I was interested in the performance of the Taoglas antenna vs. a “standard” dipole. BIG ANTENNA vs. SMALL ANTENNA!
I used the IMST LoRa Radio Link Test system to run long (hundreds of packets) repeat tests outside in the open, away from any clutter, at 10m distance. TX power +17dBm.
Using the IMST dipole antennae at both ends I got very stable downlink/uplink RSSI of -53/-53 dBm and SNRs of 7/7 dB.
Using the IMST dipole antenna at one end and the Taoglas PCB antenna at the other end I got very stable downlink/uplink RSSI of -72/-73 dBm and SNRs of 8/7 dB.
So… about 20dB difference which really just confirms common sense. The PCB antenna works very well but will deliver a much shorter range. 20dB difference means that if the dipole will work over 10km then the PCB antenna will work over about 1km.