E.I.R.Phường.Quý Khách sẽ xem: Eirp là gì (Effective sầu Isotropic Radiated Power) - is an equivalent effective isotropic radiated power defined as a power that would have lớn be radiated by a hypothetical isotropic antenmãng cầu to achieve identical signal level in the direction of maximum radiation of a specific antenmãng cầu.”

In accordance lớn Polish & EU regulations, the maximum power that can be used lớn transmit in the specific WLAN frequency range (exceeding the power means that you are breaking the law):

2400,0 – 2483,5 MHz (2.4 GHz band) - power up to lớn 100 mW E.I.R.P. (20 dBm),5150 – 5350 MHz (5 GHz band) - power up to 200 mW E.I.R.P. (23 dBm) - for indoor use only,5725 – 5875 MHz (5 GHz band) - power up khổng lồ 1000 mW E.I.R.P.. (30 dBm).

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Consider the following khổng lồ prevent E.I.R.P. thresholds from being exceeded:

transmitter (e.g. network adapter, access point) output power,cable type, length and attenuation at operating frequency và connector attenuation, antenna power gain.

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For a system including a transmitter (e.g. a wireless router), cable and antenmãng cầu, E.I.R.P.. is calculated from the following formula:

E.I.R.P. = Phường – l x Tk + Gi

Phường – transmitter power in dBml – cable length in metresTk – attenuation for 1 metre of cable at operating frequency of the transmitterGi - power gain of the isotropic antenna in dB

To simplify:

E.I.R.P. = transmitter power (dBm) + antenna gain (dBi) – cable attenuation (dB) – connector attenuation (dB)

To simplify, attenuation of a single connector is = 0.5 dB

Example. WLAN operating at 2,4 GHz band:

16 dBm access point, 8 dBi omnidirectional antenna,8 metre cable TRI-LAN-240 (attenuation for 2.4 GHz is 0.4 dB / metre), i.e. 8 x 0.4 dB = 3.2 dB,two connectors – attenuation + 2 x 0.5 dB = 1 dB.


Example: for a 13 dBi gain antenna:

E.I.R.P.. = 16 dBm + 13 dBi – 3,2 dB – 1 dB = 24,8 dBm (i.e. exceeded by 4,8 dBm!)

Rethành viên, not all access points reduce the output power. Thus, it is better to lớn use a high gain antenmãng cầu & a low power transmitter than a low gain antenna và a high power transmitter. The devices operate not only in transmission, but also reception mode, & thus the sensitivity of the receiver is also important.



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