For the co-polar antenna radiation patterns submitted as images in Gims database, kindly submit the appropriate diagrams which meet the requirements as follows:
- the co-polar antenna radiation pattern must be plotted as the antenna gain (dBi) as a function of the off-axis angle in degrees;
- the antenna gain must be defined for all off-axis angles in the range between 0 and +/-180 degrees;
- the antenna gain at 0 degrees must correspond to the respective maximum antenna gain for the same beam or associated Earth station as you have captured in the notice database;
- for any off-axis angle, only one gain value shall be defined, therefore, it's not encouraged to have more than one diagrams to describe the same antenna;
- the X and Y axes should be clearly and legibly labelled;
- all values should be compatible with the notice database;
- the image must be sufficiently good quality that can be clearly viewed in Gims by others.
Alternatively, kindly consult the Bureau's documentation on Antenna Pattern Library (APL) online, which contains the description of antennas, available at http://www.itu.int/en/ITU-R/software/Pages/ant-pattern.aspx , and capture the pattern IDs in your notice database which can represent the characteristics
of your antennas if possible.
If it's provided as equations, formulae, or a table describing all parts of the pattern as mentioned above, the Bureau will then assign the pattern ID in the said Antenna Pattern Library and capture the pattern ID in the notice database, when possible, for publication. Diagrams as images are not usable by technical examination software at the notification stage.
Once the maximum isotropic gain for a space station is less than or equal to 5 dBi, it is encouraged to use pattern IDs 609 / 610 to denote the antenna pattern for the non-directional antenna for the space station.
Please be aware that the cross-validation option of the BRSIS Validation software must be executed when validating the SNS format database against the GIMS format database, if any, for all notices in order to overcome any difficulties identified in the validation report for your notice before it is submitted to the Bureau in accordance with section § 3.4 of the Rules of Procedure concerning the Receivability of forms of notice.
