An antenna system for a global navigation satellite system reference base station is disclosed.

The antenna system includes an antenna positioned above a high capacitive impedance surface (HCIS) ground plane.

Over a specific range of the lateral dimension of the HCIS ground plane and the height of the antenna above the HCIS ground plane, a high level of multipath suppression and high sensitivity for low-elevated satellites can be simultaneously maintained.

The HCIS ground plane can be fabricated as a flat conducting plate with an array of conducting elements such as pins, pins with expanded tips, or mushroom structures. Alternatively, the HCIS can be fabricated as a flat conducting plate with a concentric series of choke rings.

The antenna system can provide a positioning accuracy of +/−1 mm, an order of magnitude improvement over previous designs.

A scanning antenna includes a transmission and/or reception region including a plurality of antenna units and a non-transmission and/or reception region other than the transmission and/or reception region. The scanning antenna includes a TFT substrate, a slot substrate, a liquid crystal layer provided between the TFT substrate and the slot substrate, a seal portion provided in the non-transmission and/or reception region and surrounding the liquid crystal layer, a reflective conductive plate disposed opposing a second main surface of a second dielectric substrate with a dielectric layer interposed between the reflective conductive plate and the second main surface, a first spacer structure defining a first gap between a first dielectric substrate and the second dielectric substrate in the transmission and/or reception region, and a second spacer structure defining a second gap between the first dielectric substrate and the second dielectric substrate in the non-transmission and/or reception region, the second gap being wider than the first gap. The second spacer structure is disposed within the seal portion or within a region surrounded by the seal potion.

A TFT substrate includes a transmission and/or reception region including a plurality of antenna unit regions, and a non-transmission and/or reception region other than the transmission and/or reception region. The TFT substrate includes a dielectric substrate, and the plurality of antenna unit regions, a plurality of gate bus lines, and a plurality of source bus lines supported on the dielectric substrate. Each of the antenna unit regions includes a TFT and a patch electrode electrically connected to a drain electrode of the TFT. The TFT substrate further includes a first conductive layer including one of a gate electrode or a source electrode of the TFT, a first insulating layer on the first conductive layer, and a plurality of terminal sections provided in the non-transmission and/or reception region.

An information handling system (IHS) includes a multiple antenna system. The multiple antenna system includes a first antenna system, the first antenna system comprising a first antenna and a first reflector network; a second antenna system, the second antenna comprising a second antenna and a second reflector network, at least one of the first reflector network and the second reflector network comprising a configurable pattern reflector; and, an antenna control system, the antenna control system controlling configuration of the configurable pattern reflector.

An information handling system (IHS) includes a multiple antenna system. The multiple antenna system includes a first antenna system, the first antenna system comprising a first antenna and a first reflector network; a second antenna system, the second antenna comprising a second antenna and a second reflector network, at least one of the first reflector network and the second reflector network comprising a configurable pattern reflector; and, an antenna control system, the antenna control system controlling configuration of the configurable pattern reflector.

According to one embodiment, a method of driving a phased array antenna, includes applying voltages to phase control electrodes in a first period such that radio waves to be emitted from antennas are in a same phase in a first emission direction, and applying the voltages to the phase control electrodes in a second period such that the radio waves to be emitted from the antennas are held in the same phase in the first emission direction. An absolute value of the voltage applied in the second period is different from an absolute value of the voltage applied in the first period, in each of the phase control electrodes.

A TFT substrate includes a dielectric substrate and a plurality of antenna unit regions arranged on the dielectric substrate. Each of the plurality of antenna unit regions includes a TFT, a patch electrode electrically connected to a drain electrode of the TFT, and a patch drain connection section electrically connecting the drain electrode to the patch electrode, and the patch drain connection section includes a conductive portion included in a conductive layer, the conductive layer being closer to the dielectric substrate than a conductive layer including the patch electrode and being either one of a conductive layer including a gate electrode of the TFT or a conductive layer including a source electrode of TFT, the either one being closer to the dielectric substrate than the other.

A TFT substrate includes a dielectric substrate and a plurality of antenna unit regions arranged on the dielectric substrate. Each of the plurality of antenna unit regions includes a TFT, a patch electrode electrically connected to a drain electrode of the TFT, and a patch drain connection section electrically connecting the drain electrode to the patch electrode, and the patch drain connection section includes a conductive portion included in a conductive layer, the conductive layer being closer to the dielectric substrate than a conductive layer including the patch electrode and being either one of a conductive layer including a gate electrode of the TFT or a conductive layer including a source electrode of TFT, the either one being closer to the dielectric substrate than the other.

The present invention refers to a reconfigurable antenna structure. The antenna structure comprises a radiating structure comprising one or more first radiating elements and a secondary radiating structure, operationally associated with said primary radiating structure. Said secondary radiating structure comprises a plurality of second radiating elements that can be selectively electrically connected/disconnected to each other to vary the configuration of said secondary radiating structure, so as to vary the radiating properties of the antenna structure. The antenna structure also comprises first reactive loads, electrically connected between said primary and secondary radiating structures, and second reactive loads, electrically connected to said secondary radiating structure. Said first reactive loads, said second reactive loads and said second radiating elements forming one or more circuitry structures that are electrically resonant in the operating frequency band of said antenna structure and that are electrically connected/disconnected to each other in a selective manner in accordance to the configuration selected for said second radiating structure, thereby maintaining constantly equal to zero the overall reactive load that is electrically connected to said primary radiating structure.

A wave shaping device which comprises a tunable impedance surface and a controller connected to the surface in order to control its impedance. The shaping device further comprises a transmission module for receiving a pilot signal used to control the impedance of the surface.