Antenna apparatus and spacecraft

An antenna apparatus, comprising:

• a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside;
• and
• a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit;
• a sub-reflection unit that faces the main-reflection unit and includes a sub-reflector shaped and sized to reflect the radio wave radiated from the radiator to the main-reflection unit when in use;
• wherein the sub-reflection unit is configured to be movable so as to be at a position in which the sub-reflector reflects the radio wave to the main-reflection unit when in use;
• and
• wherein at least one end of the restriction member is detachably locked in the stored state, and the restriction is released when the one end is unlocked by movement of the sub-reflector.

An antenna apparatus, comprising:

• a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside;
• and
• a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit;
• a sub-reflection unit that faces the main-reflection unit and includes a sub-reflector shaped and sized to reflect the radio wave radiated from the radiator to the main-reflection unit when in use;
• wherein the sub-reflection unit is configured to be movable so as to be at a position in which the sub-reflector reflects the radio wave to the main-reflection unit when in use;
• and
• wherein one end and the other end of the restriction member are fixed in the stored state, and the restriction is released when the restriction member is cut by movement of the sub-reflector.