A Compact Sequential-Phase Feed Using Uniform Transmission Lines for Circularly Polarized Sequential-Rotation Arrays

作者：Lin Shih Kai^*; Lin Yi Cheng

来源：IEEE Transactions on Antennas and Propagation, 2011, 59(7): 2721-2724.

DOI：10.1109/TAP.2011.2152346

• Antenna array feeds
• antenna impedance
• broadband antennas
• circular polarization (CP)
• sequential rotation (SR)

A compact sequential-phase (SP) feed for circularly polarized sequential-rotation (SR) arrays is presented. 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 lambda(g)/4 and 3 lambda(g)/8 are given and compared. Experimental prototypes were built and verified with measured results. The proposed compact SP feed can be extended to 2(N) x 2(N) feeding networks, and is very suitable for large-scale printed CP arrays.

• 出版日期2011-7