An antenna using a liquid metal is provided. The antenna includes a plurality of antenna structures, each having an inner cavity of a form corresponding to a radiator pattern; and at least one actuator connected to at least two of the plurality of antenna structures to control movement of the liquid metal to supply the liquid metal to at least one of the antenna structures. Thereby, deterioration of an antenna performance due to an influence of a human body can be prevented, and deterioration of an antenna performance can be prevented due to a form change of an electronic device including the antenna. In this manner, optimal antenna radiation performance can be dynamically realized.

An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.

An antenna has a predetermined operating frequency, corresponding to a predetermined wavelength, and the antenna includes: a conductive sectoral horn including one open end built into a floorplan; short-circuited radiating slots, built into the floorplan, on either side of the open end; and conductive louvres, arranged above the slots and the open end, and configured to be deployed mechanically in a continuous manner to modify a radiation pattern of the antenna. The antenna can be, for example, used in stations for testing electromagnetic fields.

An antenna has a predetermined operating frequency, corresponding to a predetermined wavelength, and the antenna includes: a conductive sectoral horn including one open end built into a floorplan; short-circuited radiating slots, built into the floorplan, on either side of the open end; and conductive louvres, arranged above the slots and the open end, and configured to be deployed mechanically in a continuous manner to modify a radiation pattern of the antenna. The antenna can be, for example, used in stations for testing electromagnetic fields.

A reconfigurable antenna is provided having a liquid metal in contact with an electrolyte with the liquid metal being in a first configuration. A plurality of electrodes includes a first electrode in contact with the liquid metal and a second electrode in contact with the electrolyte. A voltage source connected across the first and second electrodes applies a voltage of a predetermined magnitude and a predetermined polarity in order to move the liquid metal from the first configuration to a second configuration and to measure resultant current flow and modify the applied voltage based on the resultant current flow. Cessation of the applied voltage locks the liquid metal in this second configuration.

The invention relates to a radioelectric device for transmitting and receiving radio waves including a radio wave generator generating radio waves that are frequency-modulated by a predetermined modulation signal and a transceiver antenna system, having a transmission-reception angle with an associated antenna aperture value, able to transmit said transmitted radio wave and receive a radio wave, and an associated radio altimetry system.

The antenna system (44) comprises a first array (45) of radiating elements (50a, 50b, 50c, 50d) able to radiate in a first frequency band and at least one second array (52.sub.i, 55, 56) of radiating elements able to radiate in a second frequency band, a plurality of activation elements able to activate and/or deactivate each of the first array and second array of radiating elements, and a control module able to control said activation elements based on a selected antenna aperture value.

The invention relates to a radioelectric device for transmitting and receiving radio waves including a radio wave generator generating radio waves that are frequency-modulated by a predetermined modulation signal and a transceiver antenna system, having a transmission-reception angle with an associated antenna aperture value, able to transmit said transmitted radio wave and receive a radio wave, and an associated radio altimetry system.

The antenna system (44) comprises a first array (45) of radiating elements (50a, 50b, 50c, 50d) able to radiate in a first frequency band and at least one second array (52.sub.i, 55, 56) of radiating elements able to radiate in a second frequency band, a plurality of activation elements able to activate and/or deactivate each of the first array and second array of radiating elements, and a control module able to control said activation elements based on a selected antenna aperture value.

A wireless communication system provides an antenna apparatus for the wireless communication system. The antenna apparatus includes a base, a plurality of Yagi-Uda antenna modules disposed in a specific arrangement, a plurality of floating metal modules correspondingly installed in upper portions of the Yagi-Uda antenna modules and selectively connected to a corresponding Yagi-Uda module among the plurality of Yagi-Uda antenna modules, a switching element for selectively switching the floating metal module and the Yagi-Uda antenna module, and a controller for controlling the Yagi-Uda antenna module to comprise a directivity in a desired direction by selectively switching the switching element.

A wireless communication system provides an antenna apparatus for the wireless communication system. The antenna apparatus includes a base, a plurality of Yagi-Uda antenna modules disposed in a specific arrangement, a plurality of floating metal modules correspondingly installed in upper portions of the Yagi-Uda antenna modules and selectively connected to a corresponding Yagi-Uda module among the plurality of Yagi-Uda antenna modules, a switching element for selectively switching the floating metal module and the Yagi-Uda antenna module, and a controller for controlling the Yagi-Uda antenna module to comprise a directivity in a desired direction by selectively switching the switching element.

An antenna device includes a main reflector (11), a sub-reflector (12) including sub-reflector panels and having a reflecting surface facing a reflecting surface of the main reflector, and a primary emitter (13) to receive a radio wave reflected by the sub-reflector (12). Each of sub-reflector panel drive mechanisms coupled to the sub-reflector panels is finely driven. A phase calculator (171) calculates a relative phase of an element electric-field vector corresponding to each of the sub-reflector panels based on a change in received electric-field strength of the radio wave received by the primary emitter (13) during driving of the sub-reflector panel drive mechanisms, and determines positions of the sub-reflector panels at which a phase distribution on an aperture surface of the main reflector (11) is minimized.