A dual circularly polarised Contrawound Quadrifilar Helix Antenna for land mobile satellite MIMO terminal

A dual circularly polarised Contrawound Quadrifilar Helix Antenna (CQHA) is proposed for land mobile satellite MIMO systems. The CQHA is combination of two QHAs with opposite winding rotation where one is positioned inside of the other. Low return loss and isolation of the CQHA elements is achieved by varying the radius of the outer QHA while the inner QHA… (More)