A Compact Sequential-phase Feed Using Uniform Transmission Lines for Circularly Polarized Sequential-rotation Arrays

  • Author
    S.-K. Lin and Y.-C. Lin
  • Published in
    IEEE Trans. Antennas Propag. vol. 59, no. 7, pp. 2721–2724
  • Time
    Jul 01, 2011
  • Abstract

    A compact sequential-phase (SP) feed for circularly polarized sequential-rotation (SR) arrays is proposed. Unlike traditional SP feed using multiple segments for impedance transformations, the presented SP feed employs only a single-stage transition where the transmission line width is uniform, making the whole SP feed very compact and neat in layout. The radial design of SP-feed lines to antenna elements may further facilitate the optimization work in adjusting the element spacing. Two miniature square SP feeds of the sizes λg/4 and 3λg/8 are given and compared. Experimental prototypes were built and verified with measured results. The proposed compact SP feed can be extended to 2N 2N feeding networks, and is very suitable for large-scale printed CP arrays.