actual somewhat proper tuning to 50+j0

README.md

@@ -1,7 +1,52 @@
-# 2.4GHz IFA
+# 2.4GHz Inverted-F PCB Antenna (IFA) Footprint
 
-![S parameter](./pics/s_param_2d.png)
+## Overview
 
-![S parameter smith](./pics/smith.png)
+This KiCad footprint provides a 2.4GHz Inverted-F antenna designed for 2-layer 1.6mm PCB (JLCPCB stackup). The antenna is tuned in the 2.4GHz ISM band.
 
-![Z parameter](./pics/z_param_2d.png)
+## Specifications
+
+- **Type:** Inverted-F Antenna (IFA)
+- **Frequency:** 2.4GHz ISM band
+- **PCB:** 2-layer, 1.6mm thickness
+- **Impedance:** 50Ω matched
+
+## Design
+
+### Footprint
+
+![Antenna Footprint](pics/footprint_v2.png)
+
+### Sketch
+
+![Antenna Sketch](pics/sketch_v2.png)
+
+## Tuning Parameters
+
+### Z-Parameters
+
+![Z-Parameters](pics/z_param_2d_v2.png)
+
+- Center frequency: 2.4460 GHz
+- Real impedance: 50.0875 Ω
+- Imaginary impedance: 0.0621 Ω
+
+### S-Parameters
+
+![S-Parameters](pics/s_param_2d_v2.png)
+
+- Center frequency (2.4460 GHz): -59.3942 dB
+- 2.4 GHz: -22.4248 dB
+- 2.4875 GHz: -23.71 dB
+- 2.2480 GHz: -9.7640 dB
+- 2.6680 GHz: -10.0289 dB
+- Bandwidth (S11 < -10dB): 0.4200 GHz
+
+### Smith Chart Parameters
+
+![Smith Chart](pics/smith_v2.png)
+
+- Frequency: 2.446 GHz
+- Angle: 35.3197°
+- Magnitude: 0.0011
+- Normalized impedance: 1.0018 + 0.0012i