This page gives the background of where I got the idea to design a patch feed in the first place. I had been looking for a patch design all over the internet when Yoshihiro Imaishi, JF6BCC/KH2GR brought to my attention a design that he used which was based on a 7N1JVW design. 7N1JVW has a Japanese web site that is translated to english here. It is a little slow in loading because the translation is done on the fly.

Here are some calculations from 7N1JVW's web site on his design:

-10DB Angle of Radiation : Simulation Value is 120 Degrees (+ / -60 Degrees)

Frequency (MHz) Reflective Coefficient (dB) SWR
2370 21 1.20
2382 23 1.15
2388 24 1.13
2394 24 1.13
2400 23 1.15
2406 20 1.22
2412 18 1.29
2418 16 1.38
2430 14 1.50

CAD Drawing files of 7N1JVW/JF6BCC Design:

AutoCAD 2000 Standard Drawing File (.dwg)
ASCII DXF File (.dxf, this is a standard generic input file for most any CAD program)
JPG graphics file of entire drawing (.jpg - not very good quality)
PDF file of the entire CAD drawing
JPG graphics file of front view
JPG graphics file of rear view
JPG graphics file of side view
JPG graphics file of patch element details
JPG graphics file of reflector details

And the original drawing I received from Yoshi is here.

To download any of the above files, you may have to "right click" and choose "Save target as..."
You have to do this for the JPG and PDF files, otherwise your browser will just display it.

I've been messing around with the program Ansoft Ensemble SV© to design and simulate my patch. Here are some plots from that program for the 7N1JVW/JF6BCC design.

Ansoft Ensemble SV© Plots of 7N1JVW/JF6BCC Design

Scattering Matrix
(Magnitude in dB)

Admittance (Y) Matrix
(Magnitude in Mhos)

Impedance (Z) Matrix
(Magnitude in Ohms)

Complex Propagation Constant

Effective Relative Permittivity

Effective Wavelength

Gain/Axial Ratio in dB
(Theta=0, Phi=0)

Gain/Axial Ratio
(Magnitude, Theta=0, Phi=0)

VSWR (Magnitude)