3-dB beamwidth:The two-sided angle (in one plane) between the angles at which the antenna gain is reduced to half of the gain at the bore-sight (i.e., 3-dB gain reduction). Note that all beamwidths are “two-sided”values. For example, in an antenna with a 3-dB beamwidth of 1...
The more stacked sections, the greater the gain and the narrower the vertical beamwidth. A vertical-plane pattern for this type of antenna is shown in figure 24. Variations in electrical design can produce a downward tilt of the vertical-plane pattern as shown in figure 25. This antenna ...
It will explain the advantages of each type of antenna range and how the choices are affected by such factors as aperture size, frequency range, gain, beamwidth, polarization, field of view, sidelobe levels, and backlobe characterization desires. This paper will help the antenna engineer identify...
Let pdn,(θ, ϕ) be the noise–power density of the incoming radiation per unit solid angle and per unit bandwidth, as seen by an ideal, matched “isotropic” antenna (gain function Giso(θ, ϕ) − 1, matched effective area − Aem(iso)). The matched radiation noise Pnr received...
Pattern analysis (Gain, Directivity, Beamwidth, SLL, etc.) Near-Field to Far-Field transformation Near-Field probe correction Support for linear and circular polarizations Import of legacy NSI2000 and MI-3000 data Data Visualization: Plots – single cuts, 2D contour / image, 3D Drag and drop ...
Dipole half-length and monopole lengths are h, and θ3 is the half-power beamwidth, i.e., the width of the pattern between −3–dB points. For loops, the diameter is d, N is the number of turns, k = 2π/λ, and μe is the effective permeability. TABLE 1. LOW-GAIN-ANTENNA ...
The array gain versus scan can be calculated by using the isolated element pattern times the nominal array pattern factor times one minus the scan power reflection coefficient. The scan reflection coefficient is, of course, determined from the Scan Impedance. The array gain can also be calculated...
FIG. 39 shows a plot of simulation-predicted boresite gain versus frequency from simulation. FIG. 40 shows a plot of Voltage Standing Wave Ratio (VSWR) versus frequency from simulation. FIG. 41 shows a Smith Chart of the input impedance of the antenna feedpoint referred to 150 Ohms from si...
Wire antennas were used on the early operational satellites such as INTELSAT I and II with an antenna gain of about 4 dBi for receive and about 9 dBi for transmit. Now they are mostly used as the tracking, telemetry, and command (TT&C) antennas because of their wide beamwidth. Horn ...
A high-gain, wide-angle, multi-beam, multi-frequency beamforming lens antenna that includes a Luneburg lens with at least one planar interface in the southern hemisphere of the Lune