EEE 334 Test 2025 Latest Update with complete
solutions.
Wavelength Formula
λ=c/f
Power decay at target
1 / r²
Power decay at receiver
1 / r⁴
Far field distance formula
Rff = 2*D² / λ
Relationship between Gain and Directivity
G=n*D
Convert dB to linear
10^(dB/10)
Convert linear to dB
10*log₁₀(linear)
Average power formula
Pt * Γ * PRF
VSWR (Voltage Standing Wave Ratio)
, 1 + |Γ| / 1 - |Γ|
Reflection coefficient (Γ)
Γ = Za - Z₀ / Za + Z₀
Aperture efficiency eAP
Effective Area / Physical Area
Radiation from a point source E(r)
E(r) = (1/r) * e^jkr K = 2π/λ
Effective Aperture Ae
(G * λ² / 4π) or (D * λ² / 4π)
Friis Formula
Pr = Pt * Gt * Gr * (λ/4*π*d)²
Doppler Frequency
Fd = 2v / λ₀ * cosθ
Target Range
(c * Γd) / 2
PRF, PRI relationship
PRI * PRF = 1
Array Pattern
solutions.
Wavelength Formula
λ=c/f
Power decay at target
1 / r²
Power decay at receiver
1 / r⁴
Far field distance formula
Rff = 2*D² / λ
Relationship between Gain and Directivity
G=n*D
Convert dB to linear
10^(dB/10)
Convert linear to dB
10*log₁₀(linear)
Average power formula
Pt * Γ * PRF
VSWR (Voltage Standing Wave Ratio)
, 1 + |Γ| / 1 - |Γ|
Reflection coefficient (Γ)
Γ = Za - Z₀ / Za + Z₀
Aperture efficiency eAP
Effective Area / Physical Area
Radiation from a point source E(r)
E(r) = (1/r) * e^jkr K = 2π/λ
Effective Aperture Ae
(G * λ² / 4π) or (D * λ² / 4π)
Friis Formula
Pr = Pt * Gt * Gr * (λ/4*π*d)²
Doppler Frequency
Fd = 2v / λ₀ * cosθ
Target Range
(c * Γd) / 2
PRF, PRI relationship
PRI * PRF = 1
Array Pattern