Ultrawideband composite cavity-backed folded sectorial bowtie antenna with stable pattern and high gain

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)2478-2483
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number8
Publication statusPublished - 2009


A composite cavity-backed folded sectorial bowtie antenna (FSBA) is proposed and investigated in this paper, which is differentially fed by an SMA connector through a balun, i.e. a transition from a microstrip line to a parallel stripline. The composite cavity as a general case, consisting of a conical part and a cylindrical rim, can be tuned freely from a cylindrical to a cup-shaped one. Parametric studies are performed to optimize the antenna performance. Experimental results reveal that it can achieve an impedance bandwidth of 143% for ≤ 2, a broadside gain of 8-15.3 dBi, and stable radiation pattern over the whole operating band. The total electrical dimensions are 0.66λm in diameter and 0.16λm in height, where λm is the free-space wavelength at lower edge of the operating frequency band. The problem about the distorted patterns in the upper frequency band for wideband cavity-backed antennas is solved in our work. © 2009 IEEE.

Research Area(s)

  • Bowtie antennas, Cavity-backed antennas, Unidirectional patterns, UWB antennas