The present invention provides a glass antenna to be provided on a window glass of a vehicle, and the glass antenna includes a hot portion, a ground portion, and an antenna main body connected to the hot portion and the ground portion. The glass antenna is configured to receive radio waves with a frequency band of 600 MHz to 5 GHz.

An antenna device suppresses reflection of electromagnetic waves from a human body or other conductors, which causes the electromagnetic waves to be sufficiently emitted in a target direction. The antenna device includes an antenna pattern and a metasurface layer. The metasurface layer is a layer that is layered on the antenna pattern and disposed on the human body side. The metasurface layer includes a first low-loss film and a second low-loss film. A first metasurface is formed on the first low-loss film. A second metasurface is formed on the second low-loss firm.

Novel directional antennas are disclosed which utilize plas-monic surfaces (PS) that include or present an array of closely-spaced parasitic antennas, which may be referred to herein as “parasitic arrays” or fractal plasmonic arrays (FPAs). These plasmonic surfaces represent improved parasitic directional antennas relative to prior techniques and apparatus. Substrates can be used which are transparent and/or translucent.

Metamaterials are employed with satellites, e.g., small satellites, to increase the observability of such satellites. Any type of suitable metamaterial can be used. In exemplary embodiments fractal-based patterns or structures may be used. A super scatterer having a metasurface is employed for the satellite and enhances the radar reflection for a given area of the satellite. Such detection can be used for monitoring and/or controlling the orbits of satellite space craft.

Methods, systems, and devices for wireless signal transmission are described. A fractal antenna may be utilized to wirelessly communicate with a transmitter implanted within or located external to the patient. The fractal antenna may be implanted within the patient and may be coupled with a lead also implanted within the patient. The characteristics of the fractal antenna may allow for enhanced data transmission between the antenna and the transmitter while reducing the need for implanted wires to connect the transmitter and leads.

Provided are a positioning method, device and system for a transmitting device, and a storage medium and an electronic device. The method includes that: control information is determined by a receiving device, wherein the control information includes temporal information and control direction information, and the control direction information is used for instructing a meta-surface control unit to adjust a reflection coefficient of a meta-surface to a target reflection coefficient corresponding to a preset direction within a target time period; a pilot signal is transmitted to the meta-surface by a transmitting device; the control information is sent to the meta-surface control unit by the receiving device ; and a signal measurement result corresponding to the preset direction is determined, and the transmitting device is positioned according to the preset direction and the signal measurement result.

Systems according to the present disclosure provide one or more surfaces that function as power transferring surfaces for which at least a portion of the surface includes or is composed of “fractal cells” placed sufficiently closed close together to one another so that a surface (plasmonic) wave causes near replication of current present in one fractal cell in an adjacent fractal cell. A fractal of such a fractal cell can be of any suitable fractal shape and may have two or more iterations. The fractal cells may lie on a flat or curved sheet or layer and be composed in layers for wide bandwidth or multibandwidth transmission.

Novel directional antennas are disclosed which utilize plas-monic surfaces (PS) that include or present an array of closely-spaced parasitic antennas, which may be referred to herein as “parasitic arrays” or fractal plasmonic arrays (FPAs). These plasmonic surfaces represent improved parasitic directional antennas relative to prior techniques and apparatus. Substrates can be used which are transparent and/or translucent.

A system is described for emitting a radiofrequency field for a magnetic resonance imaging device, including a volumetric antenna that emits a radiofrequency field, a device for homogenizing the radiofrequency field arranged between said volume antenna and a part of the body to be imaged. The device may include a first continuous metal track with an overall length of approximately 0.5 to approximately 1.5 times said wavelength of the radio frequency field. The first metallic track may occupy a surface with a largest dimension ranging between approximately 5% and approximately 15% of said wavelength of the radio frequency field. The first metal track is arranged in a pattern including a plane of symmetry that is normal to the electrical component of the radio frequency field, so as to give the device an electric dipole property including a natural frequency strictly greater than the frequency of the radio frequency field.

Metamaterials are described which can be employed with satellites, e.g., small sats, to increase the observability of such satellites. Any type of suitable metamaterial can be used. In exemplary embodiments fractal-based patterns or structures may be used.