main lobe


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main lobe

(main beam) See antenna.

main lobe

[′mān ′lōb]
(electromagnetism)
References in periodicals archive ?
The main lobe directions of Configuration 1 and Configuration 2 are about 46[degrees] and 0[degrees], respectively, with copolarized gains of 11.7 dB and 10.68 dB.
The measured data clearly showed that the expression of fluorescence protein can diffuse in different directions with respect to the fibers main lobe of radiation.
The above simulations show that the roughness of the 3D fractal surface can be characterized by the mean slope between the main lobe of function [absolute value of [gamma](k)] and the first two side-lobes, adjacent to the main lobe (see Fig.
Half-power beamwidth is the angular extent by which the power response has fallen to half of the maximum level of the main lobe. Since the half-power coincides with a 3 dB drop in power level, it is often called 3 dB beamwidth ([BW.sub.-3dB]).
Both surface and volume model exhibit relatively good agreement of radiation pattern trace in the main lobe, as seen in Fig.
Based simulated annealing optimization method, we selected two objective functions, MLA (main lobe area) and SLR (side lobe ratio), which are the parameters of measurement criteria for evaluation of identification results, and we tend to get the value of MLA, the smaller the better, and the value of SLR, the bigger the better, or to get the balance between them.
Frequency Peak Main lobe Main lobe 3-db (GHz) gain (dB) magnitude direction beam width (dBi) 5.2 5.85 6.2 10[degrees] 86[degrees] 8.3 6.2 5.9 50[degrees] 53.7[degrees] 9.5 3.9 6.5 31[degrees] 43.9[degrees] 12.2 5.9 8.6 50[degrees] 42.1[degrees] 14.6 4.7 4.7 10[degrees] 30.1[degrees]
When t = 0, [h.sub.TR](t) is maximum among the main lobe and it is unrelated with the delay time r of multipath components; namely, [h.sub.TR](t) is a superposition of the autocorrelation function of each propagation path.
The azimuth resolution is typically defined as the 3-dB-level width of the main lobe of the SAP.
Next, we choose D = dN and set the phase of the two added elements to be equal to P = -[pi] + 1/2 kD sin [[theta].sub.peak] so that the main lobe of the two-element array pattern is aligned to the main lobe of the sum pattern at the target direction and then to set the amplitude of the two added elements, A, to place a null in the direction of the desired signal (i.e., [AF.sub.Diff] [([theta])|[sub.[[theta]=[theta].sub.peak]] = 0).
This window can be seen as the convolution of two half-sized rectangular windows (for N even), giving it a main lobe width of twice the width of a regular rectangular window.