Array pattern multiplication – phased array antenna

Articles in this series Phased Array Antenna – an introduction Electronic Scanning Arrays Grating lobes in electronic scanning Array pattern multiplication (this article) Array pattern multiplication If the element pattern of an array is very broad (as in an Omni directional antenna element) the pattern of the array is mostly the Array Factor since it … Read more

Grating Lobes in Electronic Scanning

The array is a periodic structure in space with elements placed at equidistant. d/λ acts as the frequency term and λ/d as the time period. The incremental phase shift between adjacent elements is (2π/λ)×d×[sin(θ)-sin(θ0)].  d is the inter-element distance in unit of λ, θ-any position during the scanning of the array and θ0 – the … Read more

Electronic Scanning Arrays

Articles in this series Phased Array Antenna – an introduction Electronic Scanning Arrays (this article) Grating lobes in electronic scanning Array pattern multiplication Electronic scanning arrays This is considered to be the best feature of a phased array antenna. To be able to scan in a given space, without having to rotate the antenna is … Read more

Phased Array Antenna – an introduction

Key focus: Phased Array Antenna, employs simpler elemental antennas to configure a complex system, has many interesting features and capabilities.  Articles in this series Phased Array Antenna – an introduction (this article) Electronic Scanning Arrays Grating lobes in electronic scanning Array pattern multiplication Since the latter half of previous century, a class of antenna technology … Read more

Chirp Signal – FFT & PSD in Matlab & Python

Key focus: Know how to generate a Chirp signal, compute its Fourier Transform using FFT and power spectral density (PSD) in Matlab & Python. Introduction All the signals discussed so far do not change in frequency over time. Obtaining a signal with time-varying frequency is of main focus here. A signal that varies in frequency … Read more

Gaussian Pulse – FFT & PSD in Matlab & Python

Key focus: Know how to generate a gaussian pulse, compute its Fourier Transform using FFT and power spectral density (PSD) in Matlab & Python. Numerous texts are available to explain the basics of Discrete Fourier Transform and its very efficient implementation – Fast Fourier Transform (FFT).  Often we are confronted with the need to generate … Read more

Generating Basic signals – Rectangular Pulse and Power Spectral Density using FFT

Numerous texts are available to explain the basics of Discrete Fourier Transform and its very efficient implementation – Fast Fourier Transform (FFT).  Often we are confronted with the need to generate simple, standard signals (sine, cosine, Gaussian pulse, square wave, isolated rectangular pulse, exponential decay, chirp signal) for simulation purpose. I intend to show (in a series of articles) … Read more

Generating Basic signals – Square Wave and Power Spectral Density using FFT

Numerous texts are available to explain the basics of Discrete Fourier Transform and its very efficient implementation – Fast Fourier Transform (FFT).  Often we are confronted with the need to generate simple, standard signals (sine, cosine, Gaussian pulse, squarewave, isolated rectangular pulse, exponential decay, chirp signal) for simulation purpose. I intend to show (in a series of articles) how … Read more

Plot FFT using Matlab – FFT of sine wave & cosine wave

Key focus: Learn how to plot FFT of sine wave and cosine wave using Matlab. Understand FFTshift. Plot one-sided, double-sided and normalized spectrum. Introduction Numerous texts are available to explain the basics of Discrete Fourier Transform and its very efficient implementation – Fast Fourier Transform (FFT).  Often we are confronted with the need to generate … Read more