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EIRP vs ERP | difference between EIRP and ERP in LoRaWAN

This page compares EIRP vs ERP and mentions difference between EIRP and ERP used in LoRaWAN. It mentions purpose and relation between EIRP and ERP.

EIRP

The EIRP is the short form of Effective Isotropic Radiated Power. It is the total power radiated by hypothetical isotropic antenna in a single direction.

EIRP can be expressed as follows. The unit of EIRP is dBm.

EIRP formula

Where,
Transmit power is in dBm
Antenna gain is in dBi
Cable loss is in dB

Example (EIRP calculation) :
TxP = +20dBm , L = -5dB , Gt = +10 dBi
EIRP in dBm = +20 -5 + 10 = 25 dBm

ERP

The ERP is the short form of Effective Radiated Power. It is the total power radiated by an actual antenna relative to a half wave dipole rather than a theoretical isotropic antenna.

The ERP calculation is similar to EIRP. It can be expressed as follows. The only difference is the antenna gain is expressed in dBd rather than dBi.

ERP formula

Example (ERP calculation) :
TxP = +20dBm , L = -5dB , Gt = +7.85 dBd
ERP in dBm = +20 -5 + 7.85 = 22.85 dBm

Relation between EIRP and ERP

Following expression depicts relation between EIRP and ERP terms. As mentioned, EIRP value is 2.5 greater than the ERP.

EIRP vs ERP

What is the purpose of EIRP and ERP

Both of these are essential requirements to be met by any electromagnetic (EM) or radio signal transmitting devices.
➨RF Transmitting systems should meet rules set by FCC and ETSI bodies.
➨Radio devices must not exceed certain EIRP and ERP values set by above bodies.



LoRaWAN related links

The LoRaWAN Wireless tutorial covers following sub topics:
LoRaWAN Smart Parking   LoRaWAN sensor design   LoRaWAN smart healthcare system   LoRaWAN smart water metering   LoRaWAN architecture   LoRaWAN Interface Types   LoRaWAN roaming types   LoRa tutorial   LoRa Frequency Bands   LoRa protocol stack   LoRa MAC layer   LoRaWAN classes   LoRa features   LoRa Transceiver module  


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