Antenna Library/Direction Finding/Multi-Octave RHCP Cavity-Backed Spiral
CAD Geometry • SPIRALSTEP / SolidWorks AP214
3D CAD•3D CAD SOLVER MODEL
Archimedean Dual-Arm Feed
±0.001 mm CAD

Computational Verification

Primary SolverAnsys HFSS
Numerical MethodFEM
Validation StatusMeasurement-correlated
Mesh Cell Count18.5 Million
Simulation Runtime4.8 Hours

Package Deliverables

  • Touchstone .s1p
  • Axial ratio vs theta curves
  • CAD STEP
  • HFSS project
Bilateral NDA Standard & Air-Gapped Compute

Custom installed studies and platform integrations are executed on dedicated on-premise compute nodes under bilateral mutual non-disclosure agreements.

Direction FindingMeasurement-correlated

Multi-Octave RHCP Cavity-Backed Spiral

Multi-octave 400 MHz to 8 GHz circular-polarized spiral antenna for radar warning receivers (RWR), ELINT, and broadband direction finding.

Calibrated Solver Results

Band: 400 MHz – 8 GHz
Reflection Coefficient |S₁₁| (dB)Port input return loss & resonance dips across simulated bandwidth
S₁₁ (dB)-10 dB (VSWR 2:1)
-5 dB-10 dB-15 dB-20 dB-25 dB-30 dB400M2.0G4.0G6.0G8.0G
Minimum S₁₁: -19.2 dBPassband compliance: < -10 dB verified

Antenna Specifications

Operating Band
400 MHz – 8 GHz
Antenna Geometry
Two-arm planar Archimedean spiral with graded absorber cavity
Peak Realized Gain
8 dBi
Max VSWR
2:1
Radiation Efficiency
79%
Polarisation
RHCP
Target Platforms
Airborne, Tactical, UAV/Drone
Mesh Model
18.5M cells

License Model or Request Custom Platform Study

Add this antenna model to your request basket to license the validated simulation archive, re-simulate with custom material parameters, or order a vehicle/mast installed-performance study.