Patch Antenna Inset Feed: Calculator
# Step 5: Edge resistance approximation (cavity model) Rin0 = 90 * (er**2 / (er - 1)) * (L / W)
# Step 6: Inset distance y0 if Z0 < Rin0: arg = Z0 / Rin0 if arg > 1: arg = 1 y0 = (L / math.pi) * math.acos(math.sqrt(arg)) else: y0 = 0.0 # Already matched at edge (Z0 >= Rin0) patch antenna inset feed calculator
Suggested feed line width for 50Ω: 3.05 mm | (f_r) (GHz) | h (mm) | εr | Expected (y_0) (approx) | |---------------|--------|----|----------------------------| | 2.45 | 1.6 | 4.4 | 9.1–9.5 mm (FR4) | | 5.8 | 0.8 | 2.2 | 4.8–5.2 mm (5880) | | 1.9 | 1.0 | 3.55 | 15.0–16.0 mm (Rogers 4003C) | # Step 5: Edge resistance approximation (cavity model)
--- Results --- Patch width (W) : 37.26 mm Patch length (L) : 28.96 mm Effective εr : 4.125 Edge input resistance : 215.8 Ω Inset distance (y0) : 9.32 mm from edge Impedance at inset : 49.98 Ω patch antenna inset feed calculator
# Step 4: Effective length -> Physical length L Leff = c / (2 * f * math.sqrt(ereff)) L = Leff - 2 * delta_L
Great write-up about Tom Wolfe’s take on modern art. It’s funny how much our appreciation is guided by reaction and impulses that tend to settle and soften over time—hence the reason we see modern art in doctor’s offices and think nothing of it. It’s hard to imagine that book being published today, yet in its day it was a daring statement.