(2) The 200-MHz to 2-GHz range DRHA is required by MIL-STD-461E for both emissions and immunity in the 200-MHz to 1-GHz range.
Figure 1 shows the typical gain for a 200-MHz to 2-GHz DRHA. At the upper end of the frequency range, the gain drops from a 9-dB average to 3.5 dB between 1,900 and 2,000 MHz.
To get a better idea of what causes the drop in gain, a 200-MHz to 2-GHz DRHA was placed in an antenna pattern measurement taper chamber.
For this application, MICROWAVE STUDIO[R] (MWS) from Computer Simulation Technology was chosen to simulate the DRHA. This software takes a time-domain approach that offers solutions over large frequency spans after only one execution.
Figure 6 presents the actual improvement in gain when compared with the traditional 200-MHz to 2-GHz DRHA. The plot demonstrates a 6-dB improvement in gain at the 2-GHz point.
Not only have we managed to get a much higher gain and better illumination pattern at the 2-GHz point, but the improvement at 2 GHz also opens the possibility for this 200-MHz to 2-GHz DRHA to be used to higher frequencies.
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