RF System Design

RF Link Budget

Follow power from transmitter to receiver, including ideal free-space path loss.

Inputs

Results update as you enter values. Inputs stay in this browser session only.

Tx power

dBm

Tx cable/system loss

Tx antenna gain

dBi

Frequency

Frequency unitDistance

Distance unitAdditional propagation loss

Rx antenna gain

dBi

Rx cable/system loss

Receiver sensitivity

dBm

Wavelength

0.1249 m

EIRP

34 dBm

Free-space path loss

100.1 dB

Received power

-62.05 dBm

Receiver sensitivity

-90 dBm

Link margin

27.95 dB

Tx: 30 dBmAfter Tx loss: 28 dBmEIRP: 34 dBmAfter path: -66.05 dBmAfter Rx gain: -60.05 dBmReceived: -62.05 dBm

EIRP = Ptx − Ltx + Gtx; FSPL = 20 log₁₀(4πdf/c); Prx = EIRP − FSPL − Lextra + Grx − Lrx.

FSPL is ideal far-field free-space propagation. Enter terrain, fading and implementation losses separately.