An antenna device comprises: a printed circuit board formed with both sides in a plate shape including a first surface and a second surface and including at least one conductive layer between the first surface and the second surface; an array of conductive plates formed parallel to the first surface on or in the printed circuit board; a wireless communication circuit electrically connected to the array of conductive plates, coupled to the first surface, and capable of transmitting or receiving frequencies between 3 GHz and 300 GHz; and a conductive shielding structure mounted on the first surface of the printed circuit board and electrically connected to the at least one conductive layer when covering the wireless communication circuit, wherein the conductive shielding structure may include: a third surface facing the first surface when seen from the top of the first surface; and an electromagnetic bandgap (EBG) structure formed on the third surface.

An antenna assembly includes a circularly polarized antenna housing configured to mount to a mounting surface. The antenna assembly also includes a vertical antenna housing having a first end proximate to the circularly polarized antenna housing, as well as a distal end extending normally from the circularly polarized antenna housing.

An electronic device according to various embodiments may comprise: a housing; an antenna structure positioned in the housing; and a wireless communication circuit. The antenna structure may comprise: a first conductive layer comprising a first opening; a second conductive layer positioned in parallel with the first conductive layer, the second conductive layer comprising a second opening which at least partially overlaps with the first opening when the first conductive layer is seen from above; a third conductive layer positioned in parallel with the first conductive layer and interposed between the first conductive layer and the second conductive layer; a first insulating layer interposed between the first conductive layer and the third conductive layer; a second insulating layer interposed between the second conductive layer and the third conductive layer; a first conductive plate in the first opening, which is electrically separated from the first conductive layer; a second conductive plate in the second opening, which is electrically separated from the second conductive layer; a first conductive via electrically connected between the first conductive plate and the third conductive layer through the first insulating layer; and a second conductive via electrically connected between the second conductive plate and the third conductive layer through the second insulating layer. The wireless communication circuit may be configured to transmit or receive a signal having a frequency between 3 giga hertz (GHz) and 100 GHz and may be electrically connected to the antenna structure. Various embodiments may be possible.

An electromagnetically reflective plate for a miniature antenna device includes: etched conductive elements on a first dielectric substrate layer; an apertured ground plane placed between the first substrate layer and a second dielectric substrate layer; a set of metal through-vias formed in the thickness of the two substrate layers, each including an upper end making contact with one of the conductive elements, a lower end reaching a lower face of the second substrate layer, and passing through the ground plane without electrical contact in one of its apertures. Each conductive element makes contact with a plurality of vias and each via of each conductive element is connectable to another via of a neighboring conductive element using a corresponding electrical connection making contact with the lower end of this via. At least some of the electrical connections include one or more meanders.

A microwave antenna apparatus comprises a package module comprising a semiconductor unit, an antenna unit arranged on a first side of the package module and a redistribution layer group arranged on a second side of the package module opposite the first side, and an electromagnetic band gap structure, EBG, module coupled to the redistribution layer group of the package module.

An acoustically-transmissive structure with a three-dimensional distribution of subwavelength acoustic refractive indices to diffractively concentrate acoustic waves incident on an effective aperture of the structure from a range of incidence directions between a minimum acceptance angle and a maximum acceptance angle to a smaller effective aperture. In a specific embodiment, an acoustic system may include a plurality of electroacoustic transducers and an acoustic structure having a first, larger effective aperture with a three-dimensional distribution of acoustic refractive indices. The acoustic structure diffractively concentrates acoustic waves received at a first set of angles of incidence to a first electroacoustic transducer and diffractively concentrates acoustic waves received at a second set of angles of incidence to a second electroacoustic transducer. The effective apertures of each of the first and second electroacoustic transducers has a smaller effective aperture relative to the larger effective aperture of the acoustic structure.

A beamforming system, comprising a plurality of subsets of tunable resonator elements arranged on a substrate. Each subset of tunable resonator elements comprises at least two resonator elements that have a common resonance property modifiable by a common physical stimulus. A first control input may provide a first physical stimulus to modify the resonance property of all the tunable resonator elements in a first subset of tunable resonator elements. A second control input may provide a second physical stimulus to modify the resonance property of all the tunable resonator elements in a second subset of tunable resonator elements. A controller adjusts the first and second physical stimulus provided via the control inputs between a plurality of physical stimulus values. Each different physical stimulus value corresponds to one of a plurality of a unique resonance patterns and associated unique radiation patterns.

Disclosed are an active complex spatial light modulation method and apparatus for an ultra-low noise holographic display. The active complex spatial light modulation apparatus includes a substrate and a petal antenna including three petal patterns arranged on the substrate, dividing a complex plane into three phase sections, and modulating the input light into three-phase amplitude values corresponding to the phase sections. The petal antenna may have a point symmetry shape based on the center point of the petal antenna.

A filter whose absorption rate for a radio wave changes depending on a waveform of a radio wave includes: a conductive member; a rectifier circuit that links two locations of the conductive member; and an RL circuit including an inductor and a resistor, the inductor generating an electromotive force using an electric current rectified by the rectifier circuit and the resistor converting the electric current to heat.

Provided is a directional monopole array antenna using a hybrid ground plane in which a plurality of monopole antennas are connected in a form of an array, wherein the monopole antennas includes: a ground plane designed to be divided into a PMC (perfect magnetic conductor) and a PEC (perfect electric conductor) such that a surface current induced in the PEC flows in a direction; and an antenna device vertically disposed in the ground plane.