Surface scattering antennas provide adjustable radiation fields by adjustably coupling scattering elements along a wave-propagating structure. In some approaches, the scattering elements are patch elements. In some approaches, the scattering elements are made adjustable by disposing an electrically adjustable material, such as a liquid crystal, in proximity to the scattering elements. Methods and systems provide control and adjustment of surface scattering antennas for various applications.

Surface scattering antenna improvements

Described embodiments include an antenna system and method. The antenna system includes a surface scattering antenna that has an electromagnetic waveguide structure and a plurality of electromagnetic wave scattering elements. The plurality of electromagnetic wave scattering elements are distributed along the waveguide structure, have a respective activatable electromagnetic response to a guided propagating electromagnetic wave, and produce a controllable radiation pattern. A gain definition circuit defines a radiation pattern configured to acquire a possible interfering signal. The defined antenna radiation pattern has a field of view covering at least a portion of an undesired field of view of an associated antenna. An antenna controller establishes the defined radiation pattern in the surface scattering antenna by activating the respective electromagnetic response of selected electromagnetic wave scattering elements. A correction circuit reduces an influence of the received possible interfering signal in a contemporaneously received signal by the associated antenna.

Antenna system facilitating reduction of interfering signals

Surface scattering antennas provide adjustable radiation fields by adjustably coupling scattering elements along a wave-propagating structure. In some approaches, the scattering elements are complementary metamaterial elements. In some approaches, the scattering elements are made adjustable by disposing an electrically adjustable material, such as a liquid crystal, in proximity to the scattering elements. Methods and systems provide control and adjustment of surface scattering antennas for various applications.

Surface scattering antennas

Described embodiments include an antenna system and method. The antenna system includes at least two surface scattering antenna segments. Each segment includes a respective electromagnetic waveguide structure, and a respective plurality of electromagnetic wave scattering elements. The wave scattering elements are distributed along the waveguide structure, have an inter-element spacing substantially less than a free-space wavelength of a highest operating frequency of the antenna segment, have a respective activatable electromagnetic response to a propagating guided wave, and are operable in combination to produce a controllable radiation pattern. A gain definition circuit defines a series of at least two radiation patterns selected to facilitate a convergence on an antenna radiation pattern that maximizes a radiation performance metric. An antenna controller sequentially establishes each radiation pattern. A receiver receives the desired field of view signal and the undesired field of view signal.

Antenna system having at least two apertures facilitating reduction of interfering signals

Described embodiments include a system, method, and apparatus A system includes an antenna comprising a sub-Nyquist holographic aperture configured to define selectable arbitrary complex radiofrequency electromagnetic fields on a surface of the antenna A path analysis engine tests power transmission pathways from the antenna to a target device located in an environment within a space radiateable by the antenna The environment includes a human being An optimization circuit selects responsive to the tested power transmission pathways a power transmission regime The regime includes an electromagnetic radiation pattern shaped to transfer radiofrequency electromagnetic power from the antenna to the target device without exceeding a radiation exposure limit for humans A gain definition circuit selects a complex radiofrequency electromagnetic field implementing the selected power transmission regime from the at least two selectable, complex radiofrequency electromagnetic fields An antenna controller defines the selected arbitrary complex radiofrequency electromagnetic field in the sub-Nyquist holographic aperture

System wirelessly transferring power to a target device over a tested transmission pathway

In a CRLH leaky wave antenna, gain is improved. Leaky wave antenna 100 includes a part 23i forming a capacitor, a transmission line 21i, a part forming an inductor (stub) 24i and 25i, and a capacitor on a dielectric substrate 10 by a microstrip conductor. 22i, which is a portion that forms, forms the i-th repeating unit (antenna element) (i is 1 to 17). These 17 repetitions form a Composite Right and Left Handed, CRLH structure. Further, the metal plate 30 having the first dielectric plate 11 and the slots 31 to 36 is provided thereon. By adding the slots 31 to 36, the gain can be improved without impairing the characteristics of the CRLH structure that the beam can be scanned at a wide angle with a small frequency change compared to the case where the slots 31 to 36 are not provided. [Selection] Figure 1

Leakage-wave antenna

PROBLEM TO BE SOLVED: To provide an optical deflection element that changes in a light travelling direction, to make a light emitting face parallel to an incidence face and to enlarge a variable range of an emitting angle. SOLUTION: A metamaterial element has characteristics that in the optical deflection element in which insulating layers and metal layers are periodically laminated in a z axis direction of a thickness direction, when an x axis is set in a direction perpendicular to the z axis and a y axis is set in a direction perpendicular to the z axis and the x axis on a face of the insulating layer. Dispersion characteristics of a refractive index are changed along the x axis direction so that the refractive index is increased or decreased at a constant change rate in a range where an electromagnetic wave exists, along the x axis direction for a first frequency with respect to the electromagnetic wave propagating in the z axis direction. The metamaterial element has characteristics that the dispersion characteristics of the refractive index are changed along the x axis direction so that in the range where the electromagnetic wave exists, the refractive index is increased at the constant change rate along the x axis direction for the first frequency, and the refractive index is decreased at the constant change rate along the x axis direction for a second frequency which is different from the first frequency. By this means, it is possible to realize deflection at both sides with respect to the z axis. COPYRIGHT: (C)2011,JPO&INPIT

Optical deflection element

PROBLEM TO BE SOLVED: To provide a nonreflective structure which has a simple and easily producible structure and has the reflection suppressing effect that is equal to or higher than that of conventional structure. SOLUTION: The nonreflective structure 1 constituted of innumerable cones 9 arranged at a pitch not exceeding a wavelength of the light, is formed on the surface where light not to be reflected is made incident. The height of the cone 9 is lower than the pitch and an aspect ratio is 1 or less. The flank of the cone 9 is concave toward a line connecting a point on a bottom surface periphery of the cone 9 and the apex of the cone 9. The nonreflective structure 1 is manufactured by patterning with lithography or transfer of a shape by a metallic mold. COPYRIGHT: (C)2009,JPO&INPIT

和夫佐藤

Papers

Leakage-wave antenna

Optical deflection element

Nonreflective structure, optical element, metallic mold and their manufacturing method

拡張ラグランジュ法を用いたレベルセットトポロジー最適化法(機械力学,計測,自動制御)

和夫 佐藤

Papers

Leakage-wave antenna

Optical deflection element

Nonreflective structure, optical element, metallic mold and their manufacturing method

拡張ラグランジュ法を用いたレベルセットトポロジー最適化法(機械力学,計測,自動制御)

和夫佐藤