As a condition of the NASA CRS contract, SpaceX analyzed the orbital radiation environment on all Dragon systems, and how the spacecraft would respond to spurious radiation
But this kind of antenna structure usually suffered the spurious radiation
from the feed lines, which degraded the pattern performances, such as raising the side lobe level [11, 12], or causing distortion of the main beam shape in some shaped-beam pattern designs .
8 mm for tightly coupled fields that produce less spurious radiation
The active integrated antenna, which integrates active devices directly into the antenna platform, is prospective in communication systems for its simplification of the circuitry and downsizing of the transmission system , but this configuration easily generates spurious radiation
at harmonic frequencies due to the inherent features of oscillation circuit.
However, in this operating configuration, the spurious radiation
emitted by the opposite mold side may affect the measurement of thin-polymer streams.
Feeding by a coaxial probe has the advantages of ease in impedance matching and low spurious radiation
, and the disadvantage of having to be physically connected to the center of the patch.
Foreasy fabrication and spurious radiation
the coaxial feed technique is chosen.
Possible contributing factors to the inconsistencies include alignment issues, non-symmetrical anechoic chamber, as well as spurious radiation
from the coaxial cable.
Moreover, the polarization direction of the spurious radiation
from the stub and the co-polarization of the patch are cross.
The design is therefore based on the required power split for each patch, the maximum realizable impedance values for the microstrip lines to reduce spurious radiation
and coupling by the feed network, and to obtain a match a t the feed point.
Feed lines are rather long, adding to loss mechanisms, and spurious radiation
is caused at bends and junctions.