小型圆极化环形微带天线的设计

提出一种新的小型圆极化环形微带天线,通过在环形贴片内外边缘非主要辐射区域开一组狭长缝隙获得小型化特性,在环形贴片内边缘135°、315°处相对位置开一对调谐窄缝隙实现圆极化,并用带状线在环形贴片内边缘馈电.这种天线表现出了极好的圆极化特性而且很容易在低频段匹配到50Ω,与普通带状线馈电圆极化环形微带天线相比,天线谐振频率下降,尺寸缩小了近50%.

Design of a Compact Annular-Ring Microstrip Antenna for Circular Polarization

A new compact annular-ring microstrip antenna is proposed. A set of slots are inserted on the inner and outer patch boundaries in order to reduce the dimensions of the annular ring and a pair of tuning slits are used for CP performances, feed line are placed at the inner boundaries. This new compact structure provides excellent circular polarization and is easily matched to 50~ in the low frequency band. The resonant frequency is come down and the size of the proposed antenna is reduced by over 50% compared to the conventional annular-ring CP patch antenna with a strip.