lora-antennas
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Table of Contents
LoRa Antennas
Designs to consider
- 1/4 wave ground plane
- 5/8 λ
- Dipole
- Sleeve dipole
- EFHW
- Collinear
PCB Antennas
Inverted F
TI design note: https://www.ti.com/lit/an/swra228c/swra228c.pdf
Polarisation
There was a suggestion on mastodon to use circular polarisation to mitigate multipath losses from sea reflections.
Supplied with dev boards
Tested small antenna that came with Heltec Wireless Tracker with a LiteVNA.
Short black plastic rod. SMA male.
It has a peak at around 985MHz. At 868MHz it is pretty much useless.
Cables
Tested pigtails that came with devboards. Losses at 882MHz (a point used by the VNA): 100mm cable 0.1dB, 150mm 0.2dB.
Some random products / linkdump
LoRa Fiberglass Antenna, 858-878MHz, 8dBi, 1300mm £59.00 https://uk.robotshop.com/products/lora-fiberglass-antenna-858-878mhz-8dbi-1300mm
lora-antennas.1712113535.txt.gz · Last modified: 2024/04/03 03:05 by river