A method of manufacturing an electromagnetic wave reflecting structure includes the steps of presetting an operating frequency, a reflected wave pointing angle, an incident wave pointing angle, and an incident distance of an electromagnetic wave; obtaining an electromagnetic wave reflecting structure phase distribution of an electromagnetic wave reflecting structure according to the operating frequency, the reflected wave pointing angle, the incident wave pointing angle, and the incident distance; and arranging a plurality of reflecting elements on a substrate according to the electromagnetic wave reflecting structure phase distribution and a reflecting element phase curve of any one of the reflecting elements at the operating frequency.

Provided is a reflective intelligent reflecting surface (IRS) flexible board, which includes: a flexible film; and a plurality of unit cells formed on the flexible film, in which each of the plurality of unit cells includes an IC for adjusting a reflection phase, a line pattern for driving the IC, and first and second antenna patterns formed symmetrically to each other based on the IC or the line pattern.

A multibeam antenna comprises a direct radiating array (DRA) comprising a plurality of radiating elements, a reflector facing the DRA so as to reflect a field generated by the DRA, and a DRA controller configured to control the plurality of radiating elements of the DRA according to a plurality of coefficients, such that the field generated at the DRA produces a plurality of beams when reflected by the reflector. The DRA controller is configured to determine the plurality of coefficients by using a bifocal antenna model to determine a field that would be produced by a subreflector and feed horn arrangement in an equivalent bifocal antenna configured to produce the plurality of beams, and determine the plurality of coefficients required to produce a similar incident field at the surface of the reflector. A method of controlling the multibeam antenna, and corresponding computer program instructions, are also disclosed.

A configurable radio frequency device includes a surface and a plurality of configurable radio frequency elements disposed on the surface. The radio frequency elements can be configured to absorb, reflect, or pass a radio transmission. A controller is configured to control the configuration of the surface by setting the state of the radio frequency elements. The controller also determines a deployment configuration for the surface by applying a series of test configurations to the surface and receiving a measurement of signal quality as measured by a receiver. The controller can then use these measurements to determine how to set the states of the radio frequency elements for the deployment configuration.

Large intelligent surfaces (LISs) with sparse channel sensors are provided. Embodiments described herein provide efficient solutions for these problems by leveraging tools from compressive sensing and deep learning. Consequently, an LIS architecture based on sparse channel sensors is provided where all LIS elements are passive reconfigurable elements except for a few elements that are active (e.g., connected to baseband). Two solutions are developed that design LIS reflection matrices with negligible training overhead. First, compressive sensing tools are leveraged to construct channels at all the LIS elements from the channels seen only at the active elements. These full channels can then be used to design the LIS reflection matrices with no training overhead. Second, a deep learning-based solution is deployed where the LIS learns how to optimally interact with the incident signal given the channels at the active elements, which represent the current state of the environment and transmitter/receiver locations.

Systems and methods relating to independent control of a reflected EM (electromagnetic) wave's phase and magnitude. A reflective unit cell with independently controllable parameters allows for control of the magnitude and phase of the reflected wave. In some implementations, the unit cell uses coupled resonators, with each resonator having independently controllable parameters. The controllable parameters may be controllable/adjustable on the fly (dynamic parameters) or they may be configured and fixed (static parameters). The unit cell with dynamic parameters may use a dipole ring resonator nested with a split ring resonator. The unit cell with static parameters may use a rectangular ring resonator that is non-coplanar with but is electromagnetically coupled to a slot resonator. For both types of unit cell, the parameters of the resonators determine the magnitude and phase of the reflected wave.

A method of manufacturing an electromagnetic wave reflecting structure includes the steps of presetting an operating frequency, a reflected wave pointing angle, an incident wave pointing angle, and an incident distance of an electromagnetic wave; obtaining an electromagnetic wave reflecting structure phase distribution of an electromagnetic wave reflecting structure according to the operating frequency, the reflected wave pointing angle, the incident wave pointing angle, and the incident distance; and arranging a plurality of reflecting elements on a substrate according to the electromagnetic wave reflecting structure phase distribution and a reflecting element phase curve of any one of the reflecting elements at the operating frequency.

An object of the present invention is to make it possible to flexibly adjust the incidence wave directivity in a vertical plane or a horizontal plane by making the incident directivity reconfigurable. Provided is a variable reflect array, having a variable mechanism unit configured to change interval between the plurality of supercells, and, the variable mechanism unit is configured to change one of an incidence angle and a reflection angle with respect to the electromagnetic wave of the predetermined wavelength, and, keep the other of the incidence angle and the reflection angle constant with respect to the electromagnetic wave of the predetermined wavelength, by changing the interval between the plurality of supercells.

To provide a frequency selective surface of which an operating frequency and a bandwidth thereof can be readily adjusted. A frequency selective surface structured such that resonators k.sub.xy formed by conductive patterns with a same shape are periodically arranged on a dielectric substrate, wherein the resonator k.sub.xy includes: a conductor wire part with a lateral pattern 10 and a longitudinal pattern 20 which form a cross above a dielectric substrate 101; and an electrode plate part created by extending, in directions in which the lateral pattern and the longitudinal pattern are orthogonal to each other, respective both end parts of the lateral pattern and the longitudinal pattern having been extended by a prescribed length, the electrode plate part being shaped such that a tip portion thereof opposes a tip portion extended from another direction at an interval above a diagonal line, and the electrode plate part is shaped such that a central portion opposing an electrode plate part of another adjacent resonator is notched in a width of the lateral pattern, the electrode plate part being joined with the electrode plate part of the other adjacent resonator by being extended from a center of the notched portion in a width that is narrower than the width of the lateral pattern 10 and in a length that is shorter than the prescribed length, and the interval of the tip portion is wider than an interval with the electrode plate part of the other adjacent resonator.

A reconfigurable intelligent metasurface with adjustable 3-bit dual-polarization phases may include a plurality of reconfigurable intelligent metasurface units with adjustable 3-bit dual-polarization phases. Each of the plurality of reconfigurable intelligent metasurface units may include: a first layer including four fan-shaped metal patches and four Y-shaped metal patches symmetrical about a center, a second layer being a feeding layer along the x-axis direction, a third layer being a feeding layer along the y-axis direction, and a fourth layer being a metal ground layer. By changing a voltage value at two ends of each of the varactors in an orthogonal polarization direction, the reconfigurable intelligent metasurface unit may be enabled to independently implement dual-polarization 3-bit phase modulation in two orthogonal polarization directions, thereby implementing decoupling in the orthogonal polarization directions.