dish_demo.m File Reference

Demonstrates the simulation of a parabolic reflector antenna using physical optics. More...

Detailed Description

Demonstrates the simulation of a parabolic reflector antenna using physical optics.

This script initializes a parabolic dish geometry, calculates the surface current induced by a circular aperture feed (or optionally a pyramidal horn), and computes the resulting far-field radiation pattern in a 2D cut (θ-plane at fixed φ).

Key features:

• Constructs dish geometry and mesh
• Evaluates induced surface current via the equivalence principle
• Computes the radiated far-field pattern over θ at fixed φ
• Plots both surface currents and the normalized E-field (in dB)

Parameters

• Frequency: 2.5 GHz
• Feed: Circular aperture of radius a = 0.25λ₀
• Dish focal length: f = 20λ₀
• Far-field evaluation: 1000 points from θ = 90° to 270° at φ = 0

Note

The feed is defined as a lambda/4 radius uniform circular aperture.

Includes optional pyramidal horn feed for comparison.

See also

ParabolicDish

circ_aperture_fields

pyramidal_horn_fields