Cassegrain - 1
Gs = 41.9dB, SLL= -19dB, Gdel = 35.9dB, SLL = -15dB
Dm = 160, Ds = 20, FmFs =100, Feed angle = 20 deg
1. Structure
Five Deielectric Rod Feed
16.03.2018
1. Structure view
Dielectric: er=2.73, tand=0.001 (Rexolite)
z=0 port plane
Rod diameter
Square waveguide width
Full length of structure 43.43mm
Central dielectric rod length 24.50mm
Side dielectric rods length 18.60mm
Phase center z= 35.66 mm (7.77mm away from sum element tip toward square wg)
phase center-to-rod ground plane = 16.73
Waveguide’s size 2.1x2.1mm
Start diameter of the rod 2.1mm; end diameter of the rod 0.79mm
Full diameter 10.16mm
2. Results
2.1 Farfield of the original size of the rods
2.2 Farfield of the feed with 50% rod’s length increased
Feed for Cassegrain-1
2.3 Farfield with increased spacing between rods from 0.6mm to 1mm
Feed for Cassegrain-2
2.4 Farfield for not lofted dielectric rod in the waveguide
2.5 Reflection coefficient
2. Results Farfield results with sum farfield pattern of the feed system
Cross polar
Scan 9.6deg
Cross-polar scan 9.6deg
∆-Elevation pattern
Cross-polar of ∆-Elevation pattern
∆-Elevation pattern 9.6deg
Cross-polar of ∆-Elevation pattern 9.6deg scan
Cassegrain-2
Dm = 160, Ds = 24, FmFs =120, Feed angle = 22.5 deg