"Patch" feed 1700MHz for prime focus dish with F/D = 0.3 - 0.5

Was based on the design of the patch G3RUH. The feed polarization is LHCP, so that the antenna becomes RHCP when the patch is mounted as a feed for a dish. Recalculation was made for the center frequency 1700 MHz. It was made several variants before got the best results.

Frequency 1662 - 1751 MHz
SWR <1.5:1
Polarisation LHCP
Gain 8.5 db
-3db beamwidth 85 deg.
-10 db beamwidth 125 deg.
Suitable dish F/D 0.3 - 0.5
Overall diameter 160 mm
Depth 22 mm
Impedance 50 ohm
Connector N-male



Tests using an analyzer R&S FSL6 and a reflectometer.



The results of measurements return loss in 1700 Mhz:


The band at 1.5 VSWR:


Full span panorama:


The simple programm to conversion between VSWR-Return loss available here.


-------------------------------- Update 5 Jun 2012 ---------------------------------