Antennae Radiation Patterns

Three types of receiving element are utilised in AML antennae: the crossed dipole, quadrafilar array and dielectric patch, depending on application. The responses are summarised here for reference (and also reproduced separately with the information for each antenna).

The elements are typically RHCP for the majority of applications. A LHCP variant is available for each of the designs on request, however, with identical radiation patterns.

Figure 1. Polar diagram of a RHCP crossed dipole response at 1545 MHz. This pattern is representative of the DGPS antennae (AD420, AD430,AD431)
Figure 2, Cartesian projection of figure 1.
Figure 3. Response of the RHCP crossed dipole element in both elevation and azimuth characterised at 1575.42MHz for the AD591 antenna
Figure 4. RHCP quadrafilar response at 1545MHz, purple line (AD422) overlaying a typical dipole response. For DGPS reception at latitudes above 55 degrees, the former is recommended.
Figure 5. Response of the RHCP crossed dipole element for orthogonal slices in azimuth at 1622MHz. The element is used in the AD510,AD511 and AD512 Iridium antennae
Figure 6. Response of the RHCP dielectric patch element in both elevation and azimuth characterised at 1575.42MHz for the AD491 antenna
Figure 7. Response of the RHCP dielectric patch element in both elevation and azimuth characterised at 1227MHz for the AD591 antenna

Figure 8. Response of the RHCP dielectric patch element in both elevation and azimuth characterised at 1227MHz for the AD491 antenna