An antenna apparatus , comprising: an antenna part , comprising a radome , wherein the radome is shared by antenna elements comprised in the antenna apparatus ; and an active part , connected to the antenna part and comprising at least one active module , wherein each active module comprises at least one of said antenna elements , and an element reflector , a phase shifter and a radio frequency module that are corresponding to each antenna element , wherein the antenna part further comprises a primary reflector , wherein the antenna apparatus further comprises: a passive part, connected to the antenna part and comprising at least one passive module, wherein each passive module comprises at least one of said antenna elements, and an element reflector and a phase shifter that are corresponding to each antenna element, and the passive module is configured to form a passive antenna in combination with the antenna part , characterized in that the active module comprises an interface connected to a radio frequency unit of the passive antenna, wherein the interface is configured to connect the antenna element of the active module to the radio frequency unit of the passive antenna through a combiner-divider and another phase shifter; and the active module is configured to support the passive antenna at a frequency band that is different from a frequency band of an active antenna supported by the active module . an antenna part , comprising a radome , wherein the radome is shared by antenna elements comprised in the antenna apparatus ; and an active part , connected to the antenna part and comprising at least one active module , wherein each active module comprises at least one of said antenna elements , and an element reflector , a phase shifter and a radio frequency module that are corresponding to each antenna element , wherein the antenna part further comprises a primary reflector , wherein the antenna apparatus further comprises: a passive part, connected to the antenna part and comprising at least one passive module, wherein each passive module comprises at least one of said antenna elements, and an element reflector and a phase shifter that are corresponding to each antenna element, and the passive module is configured to form a passive antenna in combination with the antenna part , characterized in that the active module comprises an interface connected to a radio frequency unit of the passive antenna, wherein the interface is configured to connect the antenna element of the active module to the radio frequency unit of the passive antenna through a combiner-divider and another phase shifter; and the active module is configured to support the passive antenna at a frequency band that is different from a frequency band of an active antenna supported by the active module . a passive part, connected to the antenna part and comprising at least one passive module, wherein each passive module comprises at least one of said antenna elements, and an element reflector and a phase shifter that are corresponding to each antenna element, and the passive module is configured to form a passive antenna in combination with the antenna part , characterized in that the active module comprises an interface connected to a radio frequency unit of the passive antenna, wherein the interface is configured to connect the antenna element of the active module to the radio frequency unit of the passive antenna through a combiner-divider and another phase shifter; and the active module is configured to support the passive antenna at a frequency band that is different from a frequency band of an active antenna supported by the active module . <EOS>