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# "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.

Specification
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

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

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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.

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