Sub 1 Ghz Vs 2.4Ghz RF: Comparison Summary
You understand what is Sub 1 Ghz and you are looking to resolve the Sub 1 Ghz Vs 2.4Ghz debate. You have come to the right place.
This detailed graph below shows the major differences between Sub-1 Ghz and 2.4Ghz RF.
|Feature||Sub 1 Ghz Vs||2.4Ghz
|Range||Sub 1 Ghz is better. Long Range mode can give upto 10km Range||Range in 2.4Ghz Not as good as Sub 1 Ghz|
|Compatibility||Many Proprietary standards||Many Existing Standards in 2.4Ghz|
|Antenna Size||Higher Size for Sub 1 Ghz||Lower Size for 2.4Ghz|
|Interference||Lesser devices in Sub 1 Ghz means much lower interference||More Interference in 2.4 Ghz|
|Performance in non clear line of sight||Sub 1 Ghz waves can squeeze around buildings better||Range not as good with obstructions|
Sub 1 Ghz Vs 2.4Ghz : Detailed Comparison
Here is a detailed comparison of Sub 1 Ghz Vs 2.4Ghz with respect to a number of factors.
1Range of Sub 1 Ghz is better than 2.4Ghz
Firstly, lets understand why Sub 1 Ghz has a better range.
Assume the transmission starts at A with a power Pa and is received by B with a power Pb. Pb is directly proportional to Pa and inversely proportional to the square of the frequency and the distance. As a result, Sub 1 Ghz transmissions have a higher range for the same data rate compared to 2.4Ghz due to the lower frequency.
As a result, an additional repeater may be needed for the 2.4Ghz transmission,given the same distance
2Compatibility: 2.4Ghz is more established
Sub 1 Ghz loses the compatibility side of the Sub 1 Ghz vs 2.4Ghz debate. Our world is currently ruled by 2.4Ghz.Almost every IOT device that communicates thru RF uses 2.4Ghz. 2.4Ghz has been around for a long time and there are standards for almost every protocol. In comparison, Sub 1 Ghz proprietory technologies exist for many protocols.
3Antenna Size & Cost : Both Sub 1 Ghz and 2.4Ghz have their good points
Sub 1 Ghz needs a larger antenna size compared to 2.4Ghz. Any cost implications as a result of this, are offset in long ranges. Long range transmission may need a repeater for 2.4Ghz and this could once again tilt the cost calculations in the favor of Sub 1 Ghz.
4Interference: Sub 1 Ghz handles interference better than 2.4Ghz
Firstly, the Sub 1 Ghz band is less crowded compared to the popular 2.4Ghz frequency band. Too many devices are 2.4Ghz compatible and this makes interference a big problem for 2.4Ghz
Secondly, Sub 1 Ghz transmissions are good at weaving between obstructions such as buildings. As a result, Sub 1 Ghz transmissions can handle interference better
5Which modules are better to develop an IOT prototype: Sub 1 Ghz or 2.4Ghz?
Sub 1 Ghz has some fantastic modules and dev kits, and so does 2.4Ghz. One option to consider are modules and dev kits that are dual band and can work with a variety of frequencies. The Texas Instruments CC1350 Sensor Tag Kit is one such dual band dev kit that works with both Sub 1 Ghz and 2.4Ghz
6Applications for Sub 1 Ghz and 2.4 Ghz
The Sub 1 Ghz Vs 2.4Ghz debate isn’t settled yet, but there are some clear winners in terms of applications. Sub 1 Ghz is now a favorite for smart meters due to its ability to handle interference in industrial environments and range. 2.4 Ghz remains a favorite for home appliances such as printers and refrigerators that work well with Wifi and other standard protocols.