A method of additively manufacturing a composite article with tuned impedance and refractive-index in three dimensions. The method includes providing a ferrite feedstock. The ferrite feedstock is loaded with ferrite particles. The method further includes depositing and curing the ferrite feedstock. Therein a composite article is formed.

A method of additively manufacturing a composite article with tuned impedance and refractive-index in three dimensions. The method includes providing a ferrite feedstock. The ferrite feedstock is loaded with ferrite particles. The method further includes depositing and curing the ferrite feedstock. Therein a composite article is formed.

A phased array antenna system comprising a plurality of isotropic radiating elements and/or omnidirectional receiving elements addressing close in fields and a plurality of non-isotropic radiating elements and/or non-omnidirectional receiving elements addressing remote fields with the combined elements used to extend the maximum range of the antenna system without increasing the number of element nor the output power of the antenna. The non-isotropic radiating elements and/or the non-omnidirectional receiving elements can be formed by adding focusing structures such as lenses or reflective structures in the radiating path of isotropic radiating elements and/or omnidirectional receiving elements. Antennas with combined isotropic radiating and non-isotropic radiating elements can be utilized for electromagnetic phased array radar, communication and imaging systems and for acoustic phased array sonar or ultrasound systems.

A phased array antenna system comprising a plurality of isotropic radiating elements and/or omnidirectional receiving elements addressing close in fields and a plurality of non-isotropic radiating elements and/or non-omnidirectional receiving elements addressing remote fields with the combined elements used to extend the maximum range of the antenna system without increasing the number of element nor the output power of the antenna. The non-isotropic radiating elements and/or the non-omnidirectional receiving elements can be formed by adding focusing structures such as lenses or reflective structures in the radiating path of isotropic radiating elements and/or omnidirectional receiving elements. Antennas with combined isotropic radiating and non-isotropic radiating elements can be utilized for electromagnetic phased array radar, communication and imaging systems and for acoustic phased array sonar or ultrasound systems.

A transmitarray cell (105) comprises a first antenna element (105a) adapted to switching between two phase states, a second antenna element (105b) adapted to switching between two other phase states and between two circular polarization directions and a coupler (201) coupling the first antenna element to the second antenna element.

Disclosed is a system for performing Massive MIMO or Multi-User MIMO using a gradient index sphere (such as a Luneburg Lens). The gradient index sphere may have a plurality of radiators disposed along its outer surface such that each radiator radiates inward toward the center of the sphere so that the sphere focuses the energy from each radiator to form a tight beam. This provides for improved uplink gain for detecting and locating a mobile device within range of the system, and it enables high performance with reduced signal processing required for array-based beamforming.

Markers and related systems and methods are provided for localizing lesions within a patient's body, e.g., within a breast. The marker includes one or more photosensitive diodes for transforming light pulses striking the marker into electrical energy, one or more antennas, and a switch coupled to the photodiodes and antennas such that the light pulses cause the switch to open and close and modulate radar signals reflected by the marker back to a source of the signals. The antenna(s) may include one or more wire elements extending from a housing, one or more antenna elements printed on a substrate, or one or more chip antennas. Optionally, the marker may include a processor coupled to the photodiodes for identifying signals in the light pulses or one or more coatings or filters to allow selective activation of the marker.

Provided herein is an artificial dielectric material comprising a plurality of layered sheets of a dielectric material and a plurality of conductive elements disposed in holes made in the sheets of the dielectric material, wherein each conductive element is substantially tubular and comprises a slit along its length so as to provide a gap between two longitudinal edges. Also provided are lenses comprising the artificial dielectric materials and methods for manufacture of such materials. The artificial dielectric materials and lenses may provide desirable dielectric and radio wave focusing properties and manufacturing advantages.

A side-shield (310) for a radar transceiver (130), the side-shield (310) including a non-uniform delay structure arranged over an extension plane of the side-shield, the non-uniform delay structure being configured to delay a radar signal (220, 320) propagating through the side-shield (310) by a variable amount in dependence of a wavelength of the radar signal and in dependence of a location on the extension plane, thereby steering and/or diffusing the radar signal (320) after propagation through the side-shield (310).

A side-shield (310) for a radar transceiver (130), the side-shield (310) including a non-uniform delay structure arranged over an extension plane of the side-shield, the non-uniform delay structure being configured to delay a radar signal (220, 320) propagating through the side-shield (310) by a variable amount in dependence of a wavelength of the radar signal and in dependence of a location on the extension plane, thereby steering and/or diffusing the radar signal (320) after propagation through the side-shield (310).