Mirrors/NawfalMotii79-PLFM_RADAR
1
0
Fork 0
mirror of https://github.com/NawfalMotii79/PLFM_RADAR.git synced 2026-06-08 14:44:56 +00:00
Code Issues Packages Projects Releases Wiki Activity

sim(antenna): center 1x8 row dip on radar TX 10.520 GHz (CONN_LEN 8.0->8.15)

Browse Source 
Sweep CONN_LEN at PROFILE=balanced to land the operating-mode dip on the
chirp-band center instead of 60 MHz above it. Sensitivity is df/dCONN ≈
-0.20 GHz/mm (longer line → lower op freq).

  CONN=8.00 → dip 10.560 GHz, S11@10.520 = -12.6 dB (above TX)
  CONN=8.15 → dip 10.520 GHz, S11@10.520 = -18.8 dB (TX-centered)
  CONN=8.20 → dip 10.510 GHz, S11@10.510 = -18.4 dB (TX low edge)
  CONN=8.25 → dip 10.500 GHz, S11@10.500 = -18.4 dB (LO-centered)

CONN_LEN=8.15 wins because the radar TX 10.510-10.530 GHz sees -17 to -19 dB
symmetrically across the band, with -15 dB margin at the LO frequency. -10 dB
BW spans 10.470-10.580 GHz (110 MHz). Pitch 15.10 mm vs old Gerber 15.01 mm.
This commit is contained in:
Jason
2026-05-04 00:41:28 +05:45
parent 087a0563c0
commit abc7e3c66b
1 changed files with 17 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
5_Simulations/Antenna/edge_fed_row_aeris10_v3.py
+17 -10
View File
@@ -17,16 +17,24 @@
# top-below-stopband mode (deepest dip just below the gap center).
#
# Verified design point (PROFILE=balanced, λ/25 mesh):
# W=7.854 mm L=6.95 mm CONN_LEN=8.0 mm pitch=14.95 mm
# W=7.854 mm L=6.95 mm CONN_LEN=8.15 mm pitch=15.10 mm
# INSET_DEPTH=0 (direct edge feed; inset on patch 0 drops Z to ~6 Ω which
# is unmatchable for N=8 — natural edge-fed Z at array resonance is ~80 Ω,
# close to 50 Ω so no input matching network is needed)
# FEED_W=1.16 mm FEED_LEAD=15.5 mm
#
# Verified result:
# Top-below-gap mode at 10.56 GHz: S11 = -22.5 dB, Zin = 79.9 - j3.3 Ω
# -10 dB BW: 100 MHz (10.510 - 10.610 GHz)
# Covers radar TX 10.510-10.530 GHz with S11 = -10.9 to -14.6 dB
# Verified result (operating-mode CONN_LEN swept to land dip on TX center):
# Operating mode at 10.520 GHz: S11 = -18.8 dB, Zin = 76.2 - j9.3 Ω
# -10 dB BW: 100 MHz (10.470 - 10.570 GHz)
# Across radar TX 10.510-10.530 GHz: S11 = -17.4 to -18.8 dB (symmetric)
# At 10.500 GHz (LO): S11 = -15.4 dB
#
# Sensitivity: df/dCONN_LEN ≈ -0.20 GHz/mm (longer CONN → lower op freq).
# To recenter on a different freq:
# CONN=8.25 → dip at 10.500 GHz (LO-centered, TX edge falls off)
# CONN=8.15 → dip at 10.520 GHz (TX-centered, recommended)
# CONN=8.20 → dip at 10.510 GHz (TX-low-edge centered)
# CONN=8.00 → dip at 10.560 GHz (above TX band)
#
# CRITICAL difference from edge_fed_aeris10_v3.py: single-element used inset
# (INSET_DEPTH=3.40) to match each patch to 50 Ω; row uses NO inset because
@@ -105,11 +113,10 @@ INSET_DEPTH = float(os.environ.get("INSET_DEPTH_MM", "0.0"))
INSET_GAP = float(os.environ.get("INSET_GAP_MM", "0.30"))
FEED_LEAD_L = float(os.environ.get("FEED_LEAD_MM", "15.5"))
# Connecting line. With CONN_LEN=8.0 the array's stopband is centered on the
# patch resonance (~10.5 GHz for L=6.95) and the deepest below-gap mode lands
# at 10.56 GHz, with -10 dB BW spanning 10.51-10.61 GHz (covers radar TX
# 10.510-10.530). Pitch = PATCH_L + CONN_LEN = 14.95 mm matches old Gerber.
CONN_LEN = float(os.environ.get("CONN_LEN_MM", "8.0"))
# Connecting line. CONN_LEN=8.15 lands the operating-mode dip at 10.520 GHz
# (radar TX center), giving symmetric -17 to -19 dB across the 10.510-10.530
# chirp band. Pitch = PATCH_L + CONN_LEN = 15.10 mm (vs old Gerber 15.01).
CONN_LEN = float(os.environ.get("CONN_LEN_MM", "8.15"))
PITCH = PATCH_L + CONN_LEN