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Cavity-backed circular aperture antenna constructed using a triplate transmission line

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3 Author(s)
Nakano, H. ; Coll. of Eng., Hosei Univ., Koganei, Japan ; Sugama, M. ; Yamauchi, J.

An aperture antenna is constructed using a triplate transmission line. The top and bottom conducting plates of the triplate transmission line have circular apertures. The aperture in the bottom plate is backed by a circular cavity of depth Dcav. The radiation characteristics of this antenna are analysed using the finite-difference time-domain method. It is found that the cavity reduces the undesirable parallel-plate mode power remaining in the triplate transmission line. As a result, the radiation efficiency ηrad is improved from approximately 54% for Dcav=0 (the case without the cavity) to more than 90% for Dcav⩾λ12.45/4, where where λ12.45 is the wavelength at a test frequency of 12.45 GHz. It is also found that as the cavity depth Dcav increases, the crosspolarisation component decreases and the gain increases

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Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:146 ,  Issue: 6 )