Title :
Phased-array antenna beam squinting related to frequency dependency of delay circuits
Author :
Garakoui, Seyed Kasra ; Klumperink, Eric A M ; Nauta, Bram ; Van Vliet, Frank E.
Author_Institution :
ICD Group, Univ. of Twente, Enschede, Netherlands
Abstract :
Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction ("beam squinting"). This paper quantifies beam squinting for a linear one-dimensional phased array with equally spaced antenna elements. The analysis is based on a (frequency-dependent) linear approximation of the phase transfer function of the delay circuit. The resulting relation turns out to be invariant for cascaded cells. Also a method is presented to design time-delay circuits to meet a maximum phased-array beam squinting requirement.
Keywords :
antenna phased arrays; approximation theory; delay circuits; linear antenna arrays; transfer functions; antenna elements; frequency dependent beam direction; linear one-dimensional phased array; linear phase-frequency characteristic; phase transfer function linear approximation; phased-array antenna beam squinting; phased-array system; time delay circuit frequency dependency; Approximation methods; Arrays; Delay; Equations; Linear antenna arrays; Phased arrays; Transfer functions; Analog delay; Beam pointing; Beam squint; Beam-forming; Phase-shifter; Phased-arrays; True time delay; fϕ=0;
Conference_Titel :
Radar Conference (EuRAD), 2011 European
Conference_Location :
Manchester
Print_ISBN :
978-1-4577-1156-5