Ultra-Wideband Tapered Slot Antenna Arrays with Parallel-Plate Waveguides

Masataka OTSUKA
Yoshihiko KONISHI

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.5    pp.1248-1255
Publication Date: 2010/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1248
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
tapered slot antenna,  parallel-plate waveguides,  wideband antenna,  array antenna,  FDTD,  

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Owing to their ultra-wideband characteristics, tapered slot antennas (TSAs) are used as element antennas in wideband phased arrays. However, when the size of a TSA is reduced in order to prevent the generation of a grating lobe during wide-angle beam scanning, the original ultra-wideband characteristics are degraded because of increased reflections from the ends of the tapered slot aperture. To overcome this difficulty, we propose a new antenna structure in which parallel-plate waveguides are added to the TSA. The advantage of this new structure is that the reflection characteristics of individual antenna elements are not degraded even if the width of the antenna aperture is very small, i.e., approximately one-half the wavelength of the highest operating frequency. In this study, we propose a procedure for designing the new antenna through numerical simulations by using the FDTD method. In addition, we verify the performance of the antenna array by experiments.