Circular Polarised Patch antenn , RHCP and LHCP

General

Model and some print files for receiving satellite signal in L-Band at 1700 MHz and one Inmarsat at 1540 MHz. Other frequencies can be generated.

Model is parametric and other frequencies can be generated directly in FreeCAD: input variables are Er + f0 + substrateHeight. A hole is placed at 50 ohm point off center, Zin for edge feed is calculated. BW is estimated and can be controlled by substrate height.

Printing and building

1. Follow instruction here https://sa0pej.wordpress.com/3d-print-and-build-patch-antenna/
    

Version History

• 2024-09-15 First release
• 2024-09-16 Corrected BW calculation in FreeCAD Spreadsheet => MHz
• 2024-09-29 Corrected coax probe feed for better match (1-2mm off at 1700MHz),
                         Remade all elements with 5% gyroid infill in 3mf.

Limitation

To find optimum polarisation trim the corners and comparing H and V polarised gain. 

My antenna became elliptical with 3 dB different gain in horizontal and vertical direction.  Test here.