Antenna Designer

Topics
Dipole
   • Cup Dipole
  Folded Dipole Step up Ratio
     ► Small
     ► Large
  • Short Dipole Resistance
Directivity
  • Aperture
    ► Circular
      • Central blockage loss
      • Blockage sidelobes
      • Circular Aperture Nomograph
      • Quadratic Phase Loss
    ► Square
      • Beam broadening from taper
      • Quadratic Phase Loss
    ► Unequal beamwidth nomograph
  • Omnidirectional
  • Widebeam
    ► Cardiod
    ► cosN(θ)
    ► Gaussian
    ► Unequal Beamwidths narrow
    ► Unequal Beamwidths wide
• Horn downloads
  • Circular
    ► Axially Corrugated
    ► Axially+Radial Corrugations
    ► Cup Horn
    ►Potter Horn
    ►Satoh Horn
    ► Scrimp Horn
    ►Turrin Horn
  • Rectangular
    ► Rectangular horn efficiencies
    ► Optimum designs
    ► Small optimum designs
Measurement
  • Circular Polarized Gain Factor
  • Multipath ripple
  • Angular ripple to distance
  • Dual Pol. Emax error
  • Dual Pol. Emin error
  • Near-field measurement correction
  • Metal frame radome
  •Patch Directivity
  Polarization
  • Axial ratio to CP X-pol
  • Axial ratio to pol. loss
  • Ludwig chart
  • Max-Min pol. loss
  • Path Loss Adj. for CP Gains
  • Axial ratio to inverse axial ratio
Reflectors – General Aspects
  • Geometry
  • Subtended angle scale
  • Optimum feed beamwidth
  • Feed mismatch factor
  • Axial defocusing factor
  • Surface tolerance (cm) loss
  • Surface tolerance (in) loss
  • Subreflector tolerance factors
  • Skin depth nomograph
• Reflectors – canonical
  • Prime focus
  • Offset fed
  • Cassegrain – symmetrical
  • Gregorian – symmetrical
  • Cassegrain – offset
  • Gregorian – offset
  • Open Cassegrain
  • Inverse Cassegrain
  • Dragonian
• Displaced Axis Reflector
• Generalized Dual Reflector
Transmission line
  • Return loss to reflected power loss
  • VSWR to reflected power loss
  • Return loss to VSWR
  • Peak voltage due to VSWR
  • Power de-rating due to VSWR

Offset fed reflector
The reflector can be analyzed using the student version of GRASP available from TICRA using a Gaussian beam feed antenna. 
A step-by-step presentation with audio tracks using student version of GRASP10 can be downloaded single_offset10_audio_ppt with input files:  single_offset_GRASP.