Ku-Band Satellite Calculator
Calculate wavelength, free-space path loss (FSPL), and sub-band allocation for Ka-band satellite frequencies (17.7–40 GHz).
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Inputs
Live
Math
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Related
Enter parameters and click Calculate to view results
Formula & Theory
λ = c / f, FSPL (dB) = 92.45 + 20 log₁₀(f_GHz) + 20 log₁₀(d_km)This formula is used to calculate antenna parameters for ku-band satellite calculator.
Overview
Use this Ka-band calculator to evaluate wavelength and free-space path loss (FSPL) across satellite communication frequencies. It covers standard commercial downlinks (17.7–21.2 GHz) and uplinks (27.5–31.0 GHz) as well as the full IEEE Ka-band spectrum up to 40 GHz.
Input Guide
Enter Frequency, Slant Range exactly in the units shown by this ku-band satellite. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Frequency — use GHz.
- Slant Range — use km.
Output Guide
The results describe the calculated ku-band satellite values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The Ku-Band Satellite uses λ = c / f, FSPL (dB) = 92.45 + 20 log₁₀(f_GHz) + 20 log₁₀(d_km). Supply Frequency (GHz), Slant Range (km) in the displayed units, then use the calculated values as the first engineering target for this satellite communication design or analysis.
Design Notes
Ka-band provides massive bandwidth and enables smaller ground dish antennas compared to C or Ku bands. However, its millimeter-range wavelengths are highly susceptible to rain fade and atmospheric absorption, requiring power control, adaptive coding, or site diversity in high-rainfall regions.
Build and Tuning Notes
When calculating link budgets, always factor in atmospheric gas absorption and rain attenuation models (e.g., ITU-R P.838 / P.618) in addition to FSPL, as rain fade at 30 GHz can exceed 20–30 dB during heavy downpours.
Frequently Asked Questions
What is the frequency range of the Ka-band?
IEEE defines Ka-band strictly as 26.5 to 40.0 GHz. In satellite communications, the broader K/Ka system pair encompasses downlinks from 17.7 to 21.2 GHz and uplinks from 27.5 to 31.0 GHz.
Why is rain fade such a large factor at Ka-band?
Ka-band wavelengths (7.5 mm to 17 mm) are comparable in size to raindrops. This causes significant scattering and absorption (Mie scattering), resulting in severe signal degradation during rain.
What is a typical dish size for a Ka-band ground station?
Due to the short wavelength, high antenna gain is achieved with relatively small apertures, typically ranging from 60 cm to 1.2 meters for consumer VSAT terminals.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.