A reflector for deflecting electromagnetic waves is provided. Said reflector comprises a resistive material along its edges in a specific pattern, wherein the resistive material has a resistance per square meter being higher than the resistance per square meter of the material of the reflector in order to attenuate and/or absorb electromagnetic energy of the electromagnetic waves.

A reflector for deflecting electromagnetic waves is provided. Said reflector comprises a resistive material along its edges in a specific pattern, wherein the resistive material has a resistance per square meter being higher than the resistance per square meter of the material of the reflector in order to attenuate and/or absorb electromagnetic energy of the electromagnetic waves.

A phase lag cell and an antenna including the same are disclosed. A phase lag cell according to one embodiment of the present invention comprises: a plane reflector; a substrate spaced apart and positioned at a predetermined distance from the reflector; and a phase lag circuit formed at one side of the substrate such that L-shaped patterns are formed to be vertically and horizontally symmetrical around a cross-shaped slot, and a stub having a predetermined length is extended from the end of each L-shaped pattern.

A phase lag cell and an antenna including the same are disclosed. A phase lag cell according to one embodiment of the present invention comprises: a plane reflector; a substrate spaced apart and positioned at a predetermined distance from the reflector; and a phase lag circuit formed at one side of the substrate such that L-shaped patterns are formed to be vertically and horizontally symmetrical around a cross-shaped slot, and a stub having a predetermined length is extended from the end of each L-shaped pattern.

An antenna may include rigid antenna ribs, a flexible antenna reflector layer, and a flexible support member extending behind the flexible antenna reflector layer between adjacent antenna ribs and having first and second sets of openings therein. A drawstring may extend through the first set of openings between adjacent ribs and a rear support cord is behind the flexible support member between adjacent ribs. Tie cords may extend between the flexible antenna reflector layer and the rear support cord and pass through respective ones of the second set of openings. A biasing member may maintain tension in the drawstring as adjacent antenna ribs move between first and second positions so that the flexible support member defines a pleated support body for the flexible antenna reflector layer.

An antenna may include rigid antenna ribs, a flexible antenna reflector layer, and a flexible support member extending behind the flexible antenna reflector layer between adjacent antenna ribs and having first and second sets of openings therein. A drawstring may extend through the first set of openings between adjacent ribs and a rear support cord is behind the flexible support member between adjacent ribs. Tie cords may extend between the flexible antenna reflector layer and the rear support cord and pass through respective ones of the second set of openings. A biasing member may maintain tension in the drawstring as adjacent antenna ribs move between first and second positions so that the flexible support member defines a pleated support body for the flexible antenna reflector layer.

An antenna may include rigid antenna ribs, a flexible antenna reflector layer, and a flexible support member extending behind the flexible antenna reflector layer between adjacent antenna ribs and having first and second sets of openings therein. A drawstring may extend through the first set of openings between adjacent ribs and a rear support cord is behind the flexible support member between adjacent ribs. Tie cords may extend between the flexible antenna reflector layer and the rear support cord and pass through respective ones of the second set of openings. A biasing member may maintain tension in the drawstring as adjacent antenna ribs move between first and second positions so that the flexible support member defines a pleated support body for the flexible antenna reflector layer.

An antenna may include rigid antenna ribs, a flexible antenna reflector layer, and a flexible support member extending behind the flexible antenna reflector layer between adjacent antenna ribs and having first and second sets of openings therein. A drawstring may extend through the first set of openings between adjacent ribs and a rear support cord is behind the flexible support member between adjacent ribs. Tie cords may extend between the flexible antenna reflector layer and the rear support cord and pass through respective ones of the second set of openings. A biasing member may maintain tension in the drawstring as adjacent antenna ribs move between first and second positions so that the flexible support member defines a pleated support body for the flexible antenna reflector layer.

Synthetic aperture radar transmit and receive antenna systems and methods of transmitting and receiving radar signals are disclosed. In one embodiment, a transmit and receive antenna system includes a transmit antenna array configured to transmit a plurality of radio frequency transmit signals, the transmit antenna array including a plurality of patch antenna elements mounted to a printed circuit board, each patch antenna element belonging to a subarray, and one or more power amplifiers, each power amplifier feeding a subarray of the patch antenna elements, and a reflectarray receive antenna configured to receive radio frequency signals including a plurality of reflectarray antenna elements mounted to a printed circuit board, at least one antenna feed configured to receive radio frequency signals reflected from the plurality of reflectarray antenna elements, and at least one low noise amplifier electrically connected to the at least one antenna feed.

A reflector for an antenna includes a first shaped region, wherein a curvature of the first shaped region is defined by a corresponding scan angle, and a second shaped region, wherein a curvature of the second shaped region is based on a corresponding scan angle. The curvature of the first shaped region is different than the curvature of the second shaped region.