A magnetic field focusing assembly includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

Embodiments relate to an elastically deformable item of sports equipment (100; 200; 250; 300; 500), comprising at least one deformable electromagnetic coil structure (104; 204; 254; 304; 504) arranged around a curved surface (102; 106; 202; 206; 252; 256; 302; 306; 502; 506) within the item of sports equipment, wherein the at least one deformable electromagnetic coil structure has an elongation reserve corresponding to a maximum elastic deformation of the item of sports equipment.

The present invention generally relates to an electromagnetic field vector sensing receive antenna array system for installation and deployment on a structure. A multipolarized array of collocated antenna elements is used to provide calibrated amplitude and phase radiation patterns with monopole, dipole, and loop modes generated from crossed loops connected to a be informer. The invention has applications for installation and deployment on a tower, balloon, or satellite for radio frequency sensing and location of low-frequency galactic emissions. The novel receive antenna array system comprises a multipolarized vector sensor antenna array. The disclosed direction-finding vector sensor can be installed and deployed on a structure and can detect and locate radio frequency emissions from galactic sources. The key system components of the receive antenna array system consist of deployable antennas, receivers, signal processing computer, and communications link.

An antenna system, such as a multifeed antenna system, can include at least one antenna feed element. The antenna system can include an antenna loop element. The at least one antenna feed element can be capacitively coupled to the antenna loop element. The at least one antenna feed element can include one or more capacitively coupled regions. The one or more capacitively coupled regions can form at least a portion of the capacitive coupling of the at least one antenna feed element to the antenna loop element.

A variable capacitance capacitor element according to an embodiment of the present invention comprises: a supporting substrate; a first electrode layer provided on the supporting substrate; a second electrode layer provided opposite to the first electrode layer; and a dielectric layer positioned between the first electrode layer and the second electrode layer. In accordance with an aspect, a main component of the dielectric layer is represented by a composition formula Ba.sub.1−xSr.sub.xTiO.sub.3 (0.5≦x≦0.8), and the first thin film dielectric layer has a thickness of 200 nm or smaller.

An antenna with swappable and selective radiation direction includes a first arm, a second arm electrically connected to the first arm, a third arm is electrically connected to the first arm, a first impedance tuning circuit coupled to the second arm for connecting the second arm to a ground or a first matching component according to a control signal, and a second impedance tuning circuit coupled to the third arm for connecting the third arm to the ground or a second matching component according to the control signal. By tuning impedance of the antenna, the antenna operates in a first mode corresponding to a first radiation direction or a second mode corresponding to a second radiation direction.

Wireless energy transfer system. Antennas are maintained at resonance with High Q. Techniques of maintaining the high-Q resonance matching are disclosed.

A method includes receiving a series of radio frequency (RF) signals, where, from RF signal to RF signal of the series of RF signals, a carrier frequency is changed in accordance with a frequency hopping pattern. The method further includes, while receiving the series of RF signals, sensing an environmental condition by, for a frequency hop of at least some frequency hops of the frequency hopping pattern, adjusting a characteristic of a wireless sensor to maintain proximal alignment of a resonant frequency of the wireless sensor with the carrier frequency corresponding to a present frequency of the at least some frequency hops and generating a value to represent the adjustment of the characteristic, where a set of values is generated for the at least some frequency hops and where the set of values is used to determine a sensed value of the environmental condition.

The invention provides an antenna which can be configured to use s selected number of coils but for the same operating frequency. This enables a desired (and adjustable) compromise to be found between power consumption and signal strength.

An antenna device includes an RFIC element, a power supply coil connected to the RFIC element, and a first coil conductor including a first large-diameter loop shaped conductor and a first small-diameter loop shaped conductor. The first coil conductor functions as a booster antenna and forms an antenna resonance circuit. The power supply coil is accommodated in a recess surrounded by the first small-diameter loop shaped conductor. The power supply coil is disposed in a manner that its winding direction is aligned with the winding axis direction of the first small-diameter loop shaped conductor and its outer diameter is inside a coil opening of the first small-diameter loop shaped conductor in a planar view. The power supply coil is coupled to the first small-diameter loop shaped conductor through a magnetic field.