RF Term
Radiometry
Radiometry is a concept in RF and microwave engineering. This term is commonly encountered in the design, analysis, and testing of radio frequency systems and components. A comprehensive technical definition with formulas, comparison tables, and FAQs will be added in a future update.
Key Equations
Radiometry:
Brightness temperature: TB = ε×Tphys
Received power: P = kTBB W
Radiometric sensitivity:
ΔT = Tsys/√(Bτ)
Tsys = TA+Trx (system temperature)
B = bandwidth, τ = integration time
Application:
Remote sensing, radio astronomy, security screening
Brightness temperature: TB = ε×Tphys
Received power: P = kTBB W
Radiometric sensitivity:
ΔT = Tsys/√(Bτ)
Tsys = TA+Trx (system temperature)
B = bandwidth, τ = integration time
Application:
Remote sensing, radio astronomy, security screening
Comparison
| Band | λ | ΔT (typical) | Application | Resolution |
|---|---|---|---|---|
| 1.4 GHz (L) | 21 cm | 0.1 K | Soil moisture | ~40 km |
| 6.9 GHz (C) | 4.3 cm | 0.3 K | Ocean SST | ~25 km |
| 23.8 GHz (K) | 1.3 cm | 0.5 K | Water vapor | ~15 km |
| 89 GHz (W) | 3.4 mm | 0.8 K | Precipitation | ~5 km |
| 183 GHz | 1.6 mm | 1 K | Humidity profiling | ~15 km |
Overview
Radiometry plays a role in modern RF and microwave system design. Understanding this concept is important for engineers working with radio frequency circuits, antennas, signal processing, and electromagnetic compatibility. This page will be expanded with detailed technical content, engineering equations, comparative reference tables, and frequently asked questions.
See Also