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Figure 417419: Antenna pattern identication dialog boxAnchor F417F419F417 F419
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Table 71: Description of the Antenna pattern user interface in SEAMCATAnchor T071 T071
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Description | Symbol | Type | Unit | Comments |
Library | - | Library | - | Allows importing/exporting of 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 | Scalar | dBi | Describes peak antenna gain, i.e. gain in the direction of maximum radiation (main lobe) |
Horizontal patterns: Horizontal normalized antenna pattern | gH (φq) | Function (X,Y) | 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 | gV (φ) | Function (X,Y) | 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 dialogue window is similar to those used to enter the function dialogue windows. However an important difference is that antenna pattern dialogue windows do not allow setting Constant values, 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 418420: Antenna pattern dialog boxAnchor F418F420F418 F420
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Figure 419421: Defining antenna pattern, using XY coordinates system Anchor F419F421F419 F421
Figure 420422: Defining antenna pattern, using Polar coordinates systemAnchor F420F422F420 F422
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By default all antennas have 0 dBi gain and are non-directional, i.e. no associated directivity pattern. The antenna pattern can be defined by modifying the antenna gain and activating one or more of radiation patterns depending on the requirements of the scenario. For example, it may be sufficient to activate only the horizontal pattern, but if the vertical discrimination is important in the scenario, both vertical and horizontal patterns could be activated.
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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 421423: Horizontal, vertical and Spehrical antenna pattern conventionAnchor F421F423F421 F423
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