A radiating metamaterial antenna including at least two metamaterial unit cells formed from a metamaterial layer. Each metamaterial unit cell includes: (i) a first metal portion disposed on the metamaterial layer, the first metal portion including an interior perimeter that surrounds an aperture defined by the first metal portion, and (ii) a second metal portion disposed within the aperture, wherein a perimeter of the second metal portion has a separation from the interior perimeter of the first metal portion. The radiating metamaterial antenna further includes a feed that is configured to excite one or more of the at least two metamaterial unit cells with an electromagnetic signal to cause the at least two metamaterial unit cells to radiate electromagnetic energy.

A transmission line device includes: a plurality of electrically conductive members stacked with interspaces therebetween, the plurality of electrically conductive members including three or more electrically conductive members; and a plurality of artificial magnetic conductors each located between two adjacent electrically conductive members among the plurality of electrically conductive members. Among the plurality of electrically conductive members, at least one electrically conductive member located between two endmost electrically conductive members is shaped as a plate having at least one slit. At least a portion of the plurality of artificial magnetic conductors is located around the at least one slit to suppress leakage of an electromagnetic wave propagating along the at least one slit.

A circuit board includes a dielectric layer, a conductive layer disposed on a surface of the dielectric layer, and an electromagnetic bandgap (EBG) structure disposed in the dielectric layer. The electromagnetic bandgap structure includes a via and a signal suppression board. Two opposite ends of the via are respectively connected to the electrically conductive layer and the signal suppression board respectively. The signal suppression board has at least one hollow pattern.

An antenna device includes: a dielectric substrate formed with a ground plane; a patch antenna having a dominant polarization direction in a predetermined direction on the dielectric substrate; at least one patch radiating element for supplying electric power provided on the patch antenna, the at least one patch radiating element being formed on the dielectric substrate; a patch-shaped conductor pattern formed on a substrate front face of the dielectric substrate on which the patch radiating element is formed; a plurality of connection conductors formed to penetrate the dielectric substrate for electrically connecting the conductor pattern to the ground plane; and a conductive structure having the conductor pattern and a plurality of the connection conductors. A plurality of the conductive structures is provided.

An antenna element includes an antenna radiator, an antenna dielectric substrate, a grounded metal plate, and a feed structure. The antenna radiator consists of several metal sheet units. The coupled slots between the adjacent metal sheet units form radiation slots and the grounded metal plate has a feed slot which is fed by the feed structure and the radiation slot is fed by the feed slot through coupling. This disclosure also provides an antenna packaging structure. An EBG is deployed as part of the radiator to improve the problems of high profile and narrow bandwidth of the traditional antennas. The EBG radiator also achieves low profile, broadband and high gain characteristics that is very suitable for millimeter wave band AiP and is also suitable for mass production at low cost, and therefore it can be widely used in 60 GHz WiFi system and a 5G millimeter wave communication system.

An antenna device comprises a dielectric substrate that has first and second surfaces; first and second antenna elements that are arranged on the first surface of the dielectric substrate; a ground conductor that is arranged on the second surface of the dielectric substrate; and an electromagnetic band gap structure that is arranged between the first and second antenna elements on the dielectric substrate. The electromagnetic band gap structure comprises: a plurality of patch conductors that are arranged on the first surface of the dielectric substrate and are electromagnetically coupled with the ground conductor; and at least one opening that is arranged in the ground conductor to expose the dielectric substrate, and causes the electromagnetic coupling between the plurality of patch conductors and the ground conductor to change.

A preferred compact particle accelerator can include a cell arranged along a longitudinal axis along which a particle beam is accelerated. The preferred cell can include a first plate disposed substantially orthogonal to the longitudinal axis and a second plate disposed substantially parallel to the first plate. The preferred cell can also include a first set of rods connecting the first plate to the second plate and disposed at a first radius about the longitudinal axis. Preferably, the first set of rods each defines an elliptical cross section. The preferred cell can also include a second set of rods connecting the first plate to the second plate and each disposed at least at a second radius greater than the first radius. Optimized geometry of the elliptical rods and the periodicity of the rods in the lattice provide improved wakefield suppression and allow for significant gains in frequency and output.

An antenna is provided including an electromagnetic metasurface. The electromagnetic characteristics of the antenna are dynamically tunable.

A radio frequency surface wave attenuator structure is provided. The structure may be configured to be operably coupled with a plurality of other radio frequency surface wave attenuator structures to form a metamaterial. The radio frequency surface wave attenuator structure may include a patch disposed in a first plane and defining a patch area and a backplane disposed in a second plane and extending along the second plane to be shared with the other surface wave attenuator structures. The structure may further include a via spring having a number of turns and being comprised of a conductive material. The via spring may electrically couple the patch to the backplane. The structure may further include a dielectric disposed between the patch and the backplane.

An antenna apparatus includes: a dielectric substrate; at least first and second radiators disposed in a first wiring layer in the dielectric substrate; a first reflector disposed in a first range in a second wiring layer in the dielectric substrate, the first range including a second range where the first radiator is projected in the layer thickness direction of the dielectric substrate; a second reflector disposed in a third range in the second wiring layer, the third range including a fourth range where the second radiator is projected in the layer thickness direction; and an electromagnetic band-gap disposed between the first and second radiators. The electromagnetic band-gap has patches disposed in the first wiring layer, a ground electrode disposed in a third wiring layer at a different place from the second wiring layer in the layer thickness direction, and a first via extending in the layer thickness direction, both ends of the via mutually connecting the patches and ground electrode.