An efficient analysis of the radial waveguide feed network for microstrip antenna arrays

In this paper an efficient approach is presented for a kind of feed network for microstrip antenna arrays. Both electric and magnetic dyadic Green's f unctions in the cylindrical coordinate for the radial waveguide are given f or efficient numerical calculations. The validity and efficiency of this ap proach are confirmed by the comparison of the calculated results and data p ublished in the literature. Then, a more complex feed network used by Nakan o et al. [1992] and Luk et al. [1998] is analyzed and is optimized to obtai n a new dimension of this feed network having a uniform current distributio n for the array elements. Furthermore, a new kind of topology of the feed n etwork is proposed, which is more easily optimized as a feed network having a uniform current distribution for the array elements.