Antenna/OMT Polarizer

 

Polarizer is based on truncated circular waveguide containing two rows of short circular posts.

 

Figure: Internal surface plot of polarizer

 

 

 

Table: Performance Summary

 

Parameter

Value

BANDWIDTH, GHz

Rx

Tx

 

19.70-20.20

29.50-30.00

AXIAL RATIO, dB

   Tx

   Rx: 

 

0.25

0.6

POLARIZATION

   POL:

   Rx/Tx:  Orthogonal

 

Circular

Orthogonal

INSERTION LOSS, dB

0.15 zinc

0.10 aluminum

PHYSICAL SIZE, mm

Length flange-to-flange

60

VSWR at OMT end: 

1.17:1 (22 dB)

VSWR at Feed end: 

1.17:1 (22 dB)

MATERIAL

aluminum/zinc

 

 

Figure 2: Frequency response (Return loss dB versus frequency GHz) of polarizer for two orthogonal incidental waves.