Figure 417: Antenna pattern identication dialog box
Table 71: Description of the Antenna pattern user interface in SEAMCAT
Description | Symbol | Type | Unit | Comments |
Library | - | Library | - | Allows to import/export antennas from/to the library to/from the workspace |
Name: name of the Antenna |
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Description: comments on the antenna |
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Antenna peak gain | gmax | S | dBi | Describes peak antenna gain, i.e. gain in the direction of maximum radiation (main lobe) |
Horizontal patterns: Horizontal normalized antenna pattern | gV(theta) | F | dB/deg | Defined by pairs (φ, gH(φ)), where φ (deg, range 0...+360) describes the angular offset in horizontal plane with relation to the direction of maximum radiation, and gH(φ) describes the relative gain, related to the antenna maximum peak gain. Note: gH(φ) values should be negative. Note: The antenna pattern range definition for CDMA has been modified to match the antenna patterns specified by 3GPP (deg, range -180...+180) |
Vertical patterns: Vertical normalized antenna pattern | gH(φ) | F | dB/deg | Input angle values between –90O and 90O. For the gain, only input negative values relative to the Antenna peak gain. |
Spherical patterns: Spherical normalized antenna pattern |  |
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| It describes the antenna spherical radiation pattern, defined by pairs (Φ, gS(Φ)), where Φ (deg, range 0...+180) describes the spherical angle, and gS(Φ) describes the relative gain, related to the antenna maximum peak gain. gS(Φ) values are negative and relative to the Antenna peak gain: cos ф = cos (θ)*cos(φ) |
To define the horizontal, vertical or spherical antenna patterns, the dialog window is similar to those used to enter the function dialog windows. However the important difference is that antenna pattern dialog windows do not allow to set Constant parameters, and they have two displays to present the entered data - the usual XY plane, and the Polar display. These are illustrated by two respective pictures below.
Figure 418: Antenna pattern dialog box
Figure 419: Defining antenna pattern, using XY coordinates system
Figure 420: Defining antenna pattern, using Polar coordinates system
By default all antennas have 0 dBi gain and are non-directional, i.e. not having any directivity patterns associated. Depending on the type of antenna to be described in the scenario, you may define it by modifying the antenna gain and activating one or more of radiation patterns (e.g. user may feel it sufficient to activate horizontal pattern, but if the vertical discrimination is important, both vertical and horizontal patterns could be activated as well).
It is assumed that the frequency has no impact on antenna efficiency/gain, therefore antenna gains are calculated based on pure peak gain combined with necessary angular discrimination in case of directional antennas (i.e. antennas having radiation patterns assigned in the scenario).
Figure 421: Horizontal, vertical and Spehrical antenna pattern convention