Feed Subtended Angle of Prime Focus Reflector
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
Feed Subtended Angle of Prime Focus Reflector