DishAnalyzer Class Reference

Provides analysis tools for extracting radiation pattern features from a ParabolicDish object. More...

Public Member Functions
function	DishAnalyzer (in dish)
	Constructor.
	function ()
	Computes the 3dB and trough-based beamwidths from a 2D pattern.
function	get_2d_rad_pattern (in obj, in phi, in theta_bounds, in theta_resolution)
	Returns a 2D radiation pattern at a fixed phi cut.
function	get_sidelobes (in obj, in EdB, in theta_range)
	Finds sidelobes and main lobe in a 2D pattern.
function	get_3d_rad_pattern (in obj, in theta_resolution, in phi_resolution)
	Computes full 3D radiation pattern over theta and phi.
function	extract_2d_rad_pattern_from_3d (in obj, in EdB, in THETA, in PHI, in phi)
	Extracts a 2D slice from a 3D radiation pattern at a given phi.
function	plot_2d_rad_pattern (in obj, in theta_shift, in EdB, in theta_range, in phi)
	Plots the 2D radiation pattern (normalized)
function	plot_3d_rad_pattern (in obj, in dB_threshold, in EdB, in THETA, in PHI, in flip_z_flag)
	Plots the 3D radiation pattern using a spherical projection.

Public Attributes
Property	dish
	Handle to a ParabolicDish instance.

Detailed Description

Provides analysis tools for extracting radiation pattern features from a ParabolicDish object.

This class includes utilities to compute beamwidths, identify sidelobes, and generate 2D and 3D radiation pattern data from a given ParabolicDish instance.

Constructor & Destructor Documentation

DishAnalyzer()

function DishAnalyzer

(

in

dish

)

Constructor.

Parameters

dish	A ParabolicDish object

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Member Function Documentation

extract_2d_rad_pattern_from_3d()

function extract_2d_rad_pattern_from_3d	(	in	obj,
		in	EdB,
		in	THETA,
		in	PHI,
		in	phi )

Extracts a 2D slice from a 3D radiation pattern at a given phi.

Parameters

EdB	3D pattern matrix
THETA	Grid of theta values [rad]
PHI	Grid of phi values [rad]
phi	Slice angle to extract [rad]

Return values

EdB	2D pattern slice [dB]
theta_range	Corresponding theta array
idx	Index of phi slice used

function()

function

(

)

Computes the 3dB and trough-based beamwidths from a 2D pattern.

Parameters

phi	Azimuthal angle [rad] (default = 0)
EdB	Optional 2D pattern values [dB]
theta_range	Optional theta values [rad]

Return values

bw_3dB	Width between -3dB crossings
bw_troughs	Width between adjacent troughs
bw_3dB_bounds	Theta limits of 3dB beamwidth
bw_troughs_bounds	Theta limits of trough-based beamwidth
bw_3dB_idx	Indices of 3dB points
bw_troughs_idx	Indices of trough points
ml_theta	Theta of main lobe
ml_idx	Index of main lobe peak

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get_2d_rad_pattern()

function get_2d_rad_pattern	(	in	obj,
		in	phi,
		in	theta_bounds,
		in	theta_resolution )

Returns a 2D radiation pattern at a fixed phi cut.

Parameters

phi	Azimuth angle [rad] (default = 0)
theta_bounds	[min max] bounds on theta [rad] (default = [0.5pi, 1.5pi])
theta_resolution	Number of samples across theta (default = 500)

Return values

EdB	Normalized E-field [dB]
Etheta	Theta-polarized E-field
Ephi	Phi-polarized E-field
theta_range	Array of theta values [rad]

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get_3d_rad_pattern()

function get_3d_rad_pattern	(	in	obj,
		in	theta_resolution,
		in	phi_resolution )

Computes full 3D radiation pattern over theta and phi.

Parameters

theta_resolution	Number of theta samples (default = 100)
phi_resolution	Number of phi samples (default = 100)

Return values

EdB	Normalized E-field [dB]
Etheta	Theta-polarized E-field matrix
Ephi	Phi-polarized E-field matrix
THETA	Meshgrid of theta values [rad]
PHI	Meshgrid of phi values [rad]

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get_sidelobes()

function get_sidelobes	(	in	obj,
		in	EdB,
		in	theta_range )

Finds sidelobes and main lobe in a 2D pattern.

Parameters

EdB	Radiation pattern [dB]
theta_range	Corresponding theta values [rad]

Return values

sl_idx	Indices of sidelobes
sl_theta	Theta values of sidelobes
sl_val	dB levels of sidelobes
ml_idx	Index of main lobe
ml_theta	Theta value of main lobe

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plot_2d_rad_pattern()

function plot_2d_rad_pattern	(	in	obj,
		in	theta_shift,
		in	EdB,
		in	theta_range,
		in	phi )

Plots the 2D radiation pattern (normalized)

Parameters

theta_shift	Shift applied to theta axis [rad] (default = -pi)
EdB	Optional pattern data [dB]
theta_range	Optional theta values [rad]
phi	Azimuthal cut angle [rad] (default = 0)

Return values

EdB	Computed or passed-in pattern [dB]
theta_range	Theta values [rad]

plot_3d_rad_pattern()

function plot_3d_rad_pattern	(	in	obj,
		in	dB_threshold,
		in	EdB,
		in	THETA,
		in	PHI,
		in	flip_z_flag )

Plots the 3D radiation pattern using a spherical projection.

Parameters

dB_threshold	Threshold cutoff in dB (default = -60)
EdB	Optional precomputed 3D pattern [dB]
THETA	Optional theta meshgrid [rad]
PHI	Optional phi meshgrid [rad]
flip_z_flag	Optional flag to invert Z (default = no flip)

Return values

EdB	3D pattern [dB]
THETA	Theta meshgrid [rad]
PHI	Phi meshgrid [rad]

Member Data Documentation

dish

Property dish

Handle to a ParabolicDish instance.

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The documentation for this class was generated from the following file:

• DishAnalyzer.m