Reconfigurable Modular Antenna System With Null Steering and Circular Polarization

作     者：Younus, Karam Mudhafar Sultan, Kamel Fumeaux, Christophe Abbosh, Amin 

作者机构：Univ Queensland Sch Elect Engn & Comp Sci Brisbane Qld 4072 Australia Ninevah Univ Coll Elect Engn Mosul 41002 Iraq Elect Res Inst Cairo 12622 Egypt 

出 版 物：《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 (IEEE Trans Antennas Propag)

年 卷 期：2025年第73卷第5期

页      面：2823-2833页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 

主　　题：Phase shifters Antenna radiation patterns Couplings Antennas Polarization Varactors Substrates Phased arrays Steering systems Directive antennas Antenna circular polarization (CP) null steering phase shifters 

摘      要：The design and analysis of a modular antenna system that can achieve both multidimensional null steering and dual-sense circular polarization (CP) is presented. The system is built using compact elementary units, each comprising a wideband tunable phase shifter and a printed dipole, allowing a modular assembly for various operational modes. The tunable phase shifter, designed with a broadside coupling structure and varactor-tuned stubs, provides a 145 degrees tuning range with +/- 2 degrees phase imbalance and less than 1 dB insertion loss across the band 5-7 GHz. Reconfiguration is achieved by tuning the phase shifters, enabling both 1-D and 2-D null steering as well as dual-sense CP. In its 1-D configuration, the system achieves a null steering range of +/- 40 degrees from the broadside with more than 15 dB null depth. The 2-D configuration extends this steering capability to two planes. A different configuration of modules enables left-hand and right-hand CPs with high purity, maintaining an axial ratio below 2.3 dB across the operation band. Experimental results align closely with simulations, underscoring the potential of compact, tunable phase shifters for versatile reconfigurable antenna systems.