Time modulated planar arrays with square lattices and circular boundaries

✍ Scribed by Shiwen Yang; Zaiping Nie

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 362 KB
• Volume: 18
• Category: Article
• ISSN: 0894-3370
• DOI: 10.1002/jnm.592

✦ Synopsis

The time modulation approach is extended to planar antenna arrays with square lattices and circular boundaries to synthesize ultra-low sidelobe patterns. Time modulation is achieved by switching on-off each of the array elements in pre-determined sequences, thus introducing an additional degree of design freedom to reduce the dynamic-range ratio and error tolerance requirements. The generalized Tseng-Cheng distributions, which generate axis-symmetric patterns in all f-cuts for planar arrays with square lattices and boundaries, are utilized in the synthesis of time modulated planar arrays. The sideband levels of the time modulated planar arrays are effectively suppressed by utilizing the differential evolution (DE) algorithm. Numerical results show that ultra-low sidelobes can be synthesized for time modulated planar arrays, with very low dynamic-range ratio, low sideband levels and minimal reduction in directivity.