ANTENNA ARRAYS WITH DUAL CIRCULAR POLARIZATION

摘要

The invention consists of an antenna array, for the reception of two frequency bands, comprising two pairs of radiating elements and an network for excitation of these elements for the reception of one of the bands. The radiating elements are positioned so as to free the center of the array to allow colocalized reception of the other band. The excitation network comprises hybrid elements so as to introduce a certain phase shift between the radiating elements allowing a dual circular polarization . This network must comply with two constraints:The phase shift introduced between the hybrids must be equal to the phase shift of the hybrid modulo 2ktt, .k integer, and the length of the line L1 placed between the first hybrid H1 and the first patch PA1 is such that it introduces a phase shift equal to p modulo 2ktt, .k integer