Antenna Experts an ISO 9001:2015 Quality Management Systems (QMS) certified company manufactures Antennas System for SIGINT, EW, UAV, SCADA, TETRA, CNI, ATC, SATCOM, DME, RCIED Jamming, Surveillance, Broadcast, Radio Relay, Energy, Oil Field, Smart Grid and Agriculture applications World Highest Performance Wideband Antennas for 100% Connectivity & Reliability Our portfolio includes dual polarized log periodic antenna, ultra wide band coaxial dipole, multi band antenna, aviation band antenna, fiberglass collinear antenna, HF broadband multi wire antenna, defense antenna, tactical radio relay antenna, HF broadband vertical conical monopole, marine band antenna, shipboard antenna, HF broadband dipole antenna, FM band antenna, ultra wide band discone antenna, terrestrial microwave antenna, DME antenna, transponder antenna, grid parabolic antenna, stacked dipole array, log periodic dipole array, directional yagi antenna, satellite tracking earth station antenna, jammer antenna, side mount dipole, LHCP RHCP helical antenna, circular polarized antenna, spiral antenna, dual stacked array, quad stacked array, broadband ground plane antenna and wide band vehicle mount antenna
Antenna Experts an ISO/OHSAS 18001:2007 Safety Management Systems (SMS) certified company manufactures Antennas System for SIGINT, EW, UAV, SCADA, TETRA, CNI, ATC, SATCOM, DME, RCIED Jamming, Surveillance, Broadcast, Radio Relay, Energy, Oil Field, Smart Grid and Agriculture applications
Antenna Systems manufactured by Antenna Experts are in accordance with RoHS2, REACH and WEEE compliant
Antenna Experts an ISO 14001:2015 Environmental Management Systems (EMS) certified company manufactures Antennas System for SIGINT, EW, UAV, SCADA, TETRA, CNI, ATC, SATCOM, DME, RCIED Jamming, Surveillance, Broadcast, Radio Relay, Energy, Oil Field, Smart Grid and Agriculture applications
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Home Knowledgebase Antenna Formulae

Antenna Formulae
 
Wavelength and Frequency
λ = v / f Where
λ = Wavelength in feet
v = Velocity of propagation in feet per second
f = Frequency in Hz
f = 1 / T Where
f  = Frequency in Hz
T = Time of one wave period (cycle) in second


Path Loss and Vertical Dipole Isolation
Path Loss (dB) = 10log (λ/4πr)2

Isolation (dB) = 28 + 40log (h/λ)
Where
λ = Wavelength in metres
r = Distance between transmitting
  and receiving antennas in metres
h = Vertical antenna separation


VSWR, Reflection Coefficient (ρ) and Return Loss
VSWR = (1 + ρ)/(1 - ρ) ρ = (VSWR - 1)/(VSWR + 1)
Return Loss (dB) = -20logρ


Power Received by an Antenna
P = PtGtGrλ2 / 16π2d2

Where
P  = Power received in Watts
Pt = Power transmitted in Watts
Gt = Gain ratio of transmitting antenna
      relative to an isotropic radiator
Gr = Gain ratio of receiving antenna relative
      to an isotropic radiator
λ  = Wavelength in metres
d  = Distance between transmitting and
      receiving antennas in metres


Effective Radiated Power
ERP = G x P

Where
G = Gain of transmitting antenna relative to
      an isotropic radiator
P = Input Power in Watts


VSWR Vs Return Loss and Effect of VSWR on Transmitted Power
VSWRReturn Loss (dB)Transmitted Power (%)
1.0100
1.126.499.8
1.220.899.2
1.317.798.3
1.514.096.0
2.09.5088.9
3.06.0075.0
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