Alignsat TE21- Self-tracking Feed

The product uses circular polarization from the tracking feed design principle, implement "strong coupling" to the circular waveguide tracking TE 21 mode.
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Description


Description

The product uses circular polarization from the tracking feed design principle, implement "strong coupling" to the circular waveguide tracking TE 21 mode. “Weak coupling” of TE11 mode and other modes of communication, and the coupling of the two quadrature signal realizing circular polarization. The results show that the feed in the corresponding frequency range has excellent differential radiation and matching characteristics, Sum difference isolation (without filter conditions) is better than 40dB, excellent performance with wide bandwidth and high performance.


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Mechanical Specifications
Feed Frequency C Band or Ku Band
VSWR ≤1.1
The main mode pair of the subreflector edge illumination level ≤-15dB
Main mode cross polarization level ≤-33dB
Double-mode part TE21 mold coupling degree ≥-0.5dB
Mold isolation ≥40dB
TE11 mold transmission loss ≤0.2dB
sum mold VSWR ≤1.3
Differential mold axis ratio ≤2dB
difference beam null depth ≤-40dB