Predicted radiation pattern
The CONSERT antenna system consist of two monopoles which are parallel to the Lander coordinate system XY-plane, and the monopoles are placed symmetric around the X-axis. The Z-axis is perpendicular to the plane of the monopoles and directed towards 'zenith'. The radiation diagrams are shown as functions of the polar angle measured from the the +Z-axis (nadir, the direction into the comet, has a polar angle 180 degrees), and the azimuth angle is measure from the +X-axis. Shown is the gain of the Right Hand polarized component of the total signal.
The radiation pattern of the Lander antenna system depends on the orientation of the monopoles with respect to the Lander legs.
The variations of the Lander antenna system gain over the whole hemisphere (Figure 1-3) and in a 90 degrees wide cone centered on the nadir (Figure 4-6) are shown for one position of the CONSERT antenna system with respect to the Lander legs.
The Lander legs are placed symmetric around the X-axis, so that the X-axis bisect the 120 degrees angle between the legs. This is refereed to as the 'b' position;
Figure 1-3: Hemisphere view
Figure 1: Frequency = 87 MHz; Position 'b'
Figure 2: Frequency = 90 MHz; Position 'b'
Figure 3: Frequency = 93 MHz; Position 'b'
Figure 4-6: 90 degree view centered on nadir
Figure 4: Frequency = 87 MHz; Position 'b'
Figure 5: Frequency = 90 MHz; Position 'b'
Figure 6: Frequency = 93 MHz; Position 'b'
