Antenna i.e. helix antenna, for radio transmission in e.g. satellite application, has reflecting plane to reflect part of radio wave in circularly polarized manner, where reflected and non-reflected parts are emitted in half-plane of space

摘要

The antenna has emitting units for emitting circularly polarized radio frequency wave in a rotation direction, and a reflector plane (15) e.g. metallic plane, arranged in a manner to reflect part of the wave, where reflected part is circularly polarized in another rotation direction opposite to the former rotation direction. The reflected and non-reflected parts are emitted in a same half-plane of a space. Two sets of crossed bifilar helices form a multifilar helix with four strands (10-13), where multifilar helix comprises two bifilar helix strands.