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

PROBLEM TO BE SOLVED: To raise the degree of freedom of position for ignition of mixture, so as to ignite the mixture at an appropriate position within a combustion chamber. SOLUTION: Since an annular electrode 10 for ignition is attached to a top surface 11a of a piston confronting the combustion chamber 3 with an insulator 12 interposed in between, the ignition electrode 10 and the piston 11 are electrically insulated from each other. Electromagnetic waves radiated from an electromagnetic wave radiator 4 fill the combustion chamber 3. In the vicinity of the ignition electrode 10, the electric field intensity of the electromagnetic waves is locally increased from the difference in magnetic permeability between the ignition electrode 10 and the space within the combustion chamber 3, so that plasma discharge is generated to thereby ignite the mixture within the combustion chamber 3. COPYRIGHT: (C)2006,JPO&NCIPI

Internal combustion engine and its ignitor

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

晋一郎松沢

Papers

Internal combustion engine and its ignitor

Leakage-wave antenna

晋一郎 松沢

Papers

Internal combustion engine and its ignitor

Leakage-wave antenna

晋一郎松沢