Antenna Patterns - Electrical and Computer Engineering

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connection. The reflection efficiency is easily found from transmissionline theory in terms of the reflection coefficient (').The total antenna efficiency then becomesThe definition of antenna efficiency (specifically, the antenna radiationefficiency) plays an important role in the definition of antenna gain.Antenna GainThe definitions of antenna directivity and antenna gain are essentiallythe same except for the power terms used in the definitions.Directivity [D(2,N)] - ratio of the antenna radiated power density at adistant point to the total antenna radiated power (P rad ) radiatedisotropically.Gain [G(2,N)] - ratio of the antenna radiated power density at a distantpoint to the total antenna input power (P in ) radiated isotropically.Thus, the antenna gain, being dependent on the total power delivered to theantenna input terminals, accounts for the ohmic losses in the antenna whilethe antenna directivity, being dependent on the total radiated power, doesnot include the effect of ohmic losses.
The equations for directivity and gain areThe relationship between the directivity and gain of an antenna may befound using the definition of the radiation efficiency of the antenna.Gain in dB
Page 3 and 4: Antenna Pattern DefinitionsIsotropi
Page 5 and 6: Maxwell’s Equations(Instantaneous
Page 7 and 8: ReFor time-harmonic fields, the tim
Page 9 and 10: DirectivityDirectivity (D) - the ra
Page 11 and 12: Example (Directivity/Beam Solid Ang
Page 13 and 14: MATLAB m-file for plotting this dir
Page 15 and 16: Numerical Evaluation of Directivity
Page 17 and 18: The overall integral is then approx
Page 19 and 20: The maximum value of the radiation
Page 21: We may define the antenna radiation
Page 25 and 26: In some cases, the generator may be
Page 27 and 28: From the equivalent circuit for the
Page 29 and 30: The typical receiving system can be
Page 31 and 32: Receiving antenna system summary (m
Page 33 and 34: Antenna Loss ResistanceThe antenna
Page 35 and 36: The high frequency resistance formu
Page 37: Lossless Transmission Line Fundamen
Page 40 and 41: The power available from the genera
Page 42 and 43: MATLAB m-file (generator/t-line/loa
Page 44 and 45: The polarization of the antenna in
Page 46 and 47: The instantaneous components of the
Page 48 and 49: Antenna Effective Aperture (Area)An
Page 50 and 51: Antenna Capture AreaThe total power
Page 52 and 53: These two equations yieldorIf the t
Page 54 and 55: account the orientation of the ante
Page 56 and 57: Radar cross section (RCS) - a measu
Page 58 and 59: Showing the conduction losses, mism

Antenna Patterns - Electrical and Computer Engineering

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