Reduction of cross-polarized back lobe radiation in circularly polarized loop yagi arrays

It has recently been shown that a loop yagi array can be made to generate circularly polarization by loading the driven element with reactances placed at carefully selected locations. However, the traditional design using a single reflector yields a radiation pattern with a strong cross-polarized back lobe. It is shown here that the back lobe can be reduced significantly without seriously compromising the other performance characteristics of the array by placing additional reflectors behind the first reflector.