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tags: Type/Tech,area/tech,seed
from: ["[[Radio]]"]
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dateCreated: 2024-02-03, 08:00
dateModified: 2024-02-10, 09:04
version: 1.0
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Antenna (radio)

	In radio engineering, an antenna or aerial is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves. In reception, an antenna intercepts some of the power of a radio wave in order to produce an electric current at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all radio equipment.
	wikipedia:: Antenna (radio)

In radio engineering, an antenna or aerial is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves. In reception, an antenna intercepts some of the power of a radio wave in order to produce an electric current at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all radio equipment.

wikipedia:: Antenna (radio)

Caution #v/caution: Check every antenna you buy for correct frequency

Check the antenna you get that it is matched to the intended frequency because it's not uncommon to get a mismatched antenna from China/aliexpress, etc.

Concepts

Decibel

SWR
- how much energy is going out of the antenna
- how much is being reflected back to radio
Resonance?
dbm?
Gain (antenna)

Connectors

Adapters

pigtails

Types

Monopole
- Uses the ground plane of device. So the PCB or floor or car roof, etc.
- bad for Single-board mirocontrollers
Dipole
- 2 internal elements of equal length tuned to different parts of the spectrum
- Normally a circular extending range/omnidirectional
Higher gain directional
- But the much higher Dbi range extends like an ellipsis
- Yagi
  - Good for 2 fixed locations
Omnidirectional

LoRa Antennas

RicInNewMexico/Meshtastic-Antenna-Reports: Results of antenna testing by the meshtastic open source community.

Sources

Getting More Range with Meshtastic - YouTube
- Great video explaining antennas, connectors, range, etc.
LoRa Antenna Resources | Meshtastic
#188 Antenna Tutorial incl. cheap DIY Antenna Tester (LoRa, ESP32) - YouTube
HackadayU: Introduction to Antenna Basics - YouTube

Antenna (radio)

Interactive graph

On this page

Antenna (radio)

Concepts

Connectors

Adapters

Types

LoRa Antennas

Sources