Signal Processing for Communication Systems
Key focus: Array pattern multiplication: total radiation pattern of N identical antennas is product of single-antenna radiation vector and array factor. Antenna arrays Ferdinand Braun invented the Phased Array Antenna in 1905. He shared a Nobel Prize in physics in recognition of their contributions to the development of wireless telegraphy. An antenna array is a … Read more
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
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
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
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