A self-matched wide scanning U-stub microstrip periodic leaky-wave antenna

S. Paulotto, P. Baccarelli and D.R. Jackson

Journal of Electromagnetic Waves and Applications, 2014, vol. 28, issue 2, 151-164

Abstract: A new type of printed periodic leaky-wave antenna is proposed, which is able to continuously scan a beam from backward to forward endfire. The unit cell consists of a microstrip line loaded with long lengths of transmission line folded as a U-stub and an interdigital capacitor. This U-stub geometry, which is characterized by a compact longitudinal size, permits operation at frequencies lower than other conventional periodic leaky-wave antennas. At the same time, the presence of the interdigital capacitor makes the radiating U-stub discontinuity self-matching, thus allowing for an elimination of open-stopband effects and for an achievement of an almost constant gain while the beam is scanned through broadside. A noteworthy aspect of the present design is that it represents the first periodic leaky-wave antenna that scans through broadside by radiating from the fundamental n=0$ n = 0 $ harmonic, without being a quasi-homogeneous metamaterial structure.

Date: 2014
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DOI: 10.1080/09205071.2013.858609

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