NawfalMotii79
64 lines
2.6 KiB
Python
64 lines
2.6 KiB
Python
import matplotlib.pyplot as plt
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# Dimensions (all in mm)
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line_width = 0.204
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via_pad_A = 0.20
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via_pad_B = 0.45
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polygon_offset = 0.30
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via_pitch = 0.50 # center-to-center spacing
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via_center_offset = 0.50 # RF line edge to via center
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# RF line and fence representation
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fig, ax = plt.subplots(figsize=(8, 4))
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# Draw RF line
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rf_line_y = 0
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ax.add_patch(plt.Rectangle((-5, rf_line_y - line_width/2), 10, line_width,
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facecolor="orange", edgecolor="black", label="RF Line"))
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# Draw ground plane edges (polygon edge at 0.30 mm from RF line edge)
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polygon_y1 = rf_line_y + line_width/2 + polygon_offset
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polygon_y2 = rf_line_y - line_width/2 - polygon_offset
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ax.axhline(polygon_y1, color="blue", linestyle="--", label="Polygon edge")
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ax.axhline(polygon_y2, color="blue", linestyle="--")
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# Draw vias (case A and case B)
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via_positions = [2, 2 + via_pitch] # two vias for showing spacing
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for x in via_positions:
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# Case A
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ax.add_patch(plt.Circle((x, polygon_y1), via_pad_A/2, facecolor="green", alpha=0.5, label="Via pad A" if x==2 else ""))
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ax.add_patch(plt.Circle((x, polygon_y2), via_pad_A/2, facecolor="green", alpha=0.5))
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# Case B
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ax.add_patch(plt.Circle((-x, polygon_y1), via_pad_B/2, facecolor="red", alpha=0.3, label="Via pad B" if x==2 else ""))
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ax.add_patch(plt.Circle((-x, polygon_y2), via_pad_B/2, facecolor="red", alpha=0.3))
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# Add text annotations
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ax.text(0.5, rf_line_y + line_width/2 + 0.15, "0.30 mm", color="blue")
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ax.text(0.5, rf_line_y, "0.204 mm line", color="black")
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ax.text(2, polygon_y1 + 0.4, "Via A Ø0.20 mm pad", color="green")
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ax.text(-2, polygon_y1 + 0.5, "Via B Ø0.45 mm pad", color="red")
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# Add pitch dimension (horizontal between vias)
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ax.annotate("", xy=(2, polygon_y1 + 0.2), xytext=(2 + via_pitch, polygon_y1 + 0.2),
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arrowprops=dict(arrowstyle="<->", color="purple"))
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ax.text(2 + via_pitch/2, polygon_y1 + 0.3, f"{via_pitch:.2f} mm pitch", color="purple", ha="center")
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# Add distance from RF line edge to via center
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line_edge_y = rf_line_y + line_width/2
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via_center_y = polygon_y1
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ax.annotate("", xy=(2.4, line_edge_y), xytext=(2.4, via_center_y),
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arrowprops=dict(arrowstyle="<->", color="brown"))
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ax.text(2.5, (line_edge_y + via_center_y)/2, f"{via_center_offset:.2f} mm", color="brown", va="center")
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# Formatting
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ax.set_xlim(-5, 5)
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ax.set_ylim(-2, 2)
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ax.set_aspect('equal', adjustable='box')
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ax.axis("off")
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ax.legend(loc="upper right")
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plt.title("Via Fence Setup for 10.5 GHz Microstrip Line (Pitch + Offset)")
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plt.savefig("via_fence_setup_pitch_offset.png", dpi=300, bbox_inches="tight")
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plt.close()
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