Systems and methods relating to patch antennas. A patch antenna has a substrate, a resonant metal plate at one side of the substrate, and a ground plane at the other opposite side of the substrate. Two feed pins are used to couple the antenna to other circuitry. The feed pins pass through the substrate and holes in at the ground plane. The feed pins are physically disconnected from both the resonant metal plate and the ground plane. The feed pins are capacitively coupled to the resonant metal plate to provide an electronic connection between other circuitry and the patch antenna.

An antenna structure includes at least one radiation portion, first, second, and third feed sources, and first and second grounding portions. The at least one radiation portion is formed by a partial portion of the metal frame of the electronic device, the portion being defined by gaps. The first to third feed sources are arranged at intervals and are electrically connected to the at least one radiation portion in such a way as to make the radiation portion form a plurality of antennas. The first end of the first grounding portion is electrically connected to the radiation portion, the second end of the first grounding portion is grounded, the first end of the second grounding portion is electrically connected to the radiation portion, and the second end of the second grounding portion is grounded. The present disclosure also provides an electronic device with the antenna structure.

An antenna structure includes at least one radiation portion, first, second, and third feed sources, and first and second grounding portions. The at least one radiation portion is formed by a partial portion of the metal frame of the electronic device, the portion being defined by gaps. The first to third feed sources are arranged at intervals and are electrically connected to the at least one radiation portion in such a way as to make the radiation portion form a plurality of antennas. The first end of the first grounding portion is electrically connected to the radiation portion, the second end of the first grounding portion is grounded, the first end of the second grounding portion is electrically connected to the radiation portion, and the second end of the second grounding portion is grounded. The present disclosure also provides an electronic device with the antenna structure.

In a general aspect, a communication system comprises a first station and a second station. The first station includes a photonic crystal maser, a laser subsystem, and a tracking subsystem. A photonic crystal structure of the photonic crystal maser is formed of dielectric material and has an array of cavities and an elongated slot. The elongated slot is disposed in a defect region of the array of cavities. The photonic crystal maser also includes a vapor disposed in the elongated slot and operable to emit a target RF electromagnetic radiation in response to receiving an optical signal. The array of cavities and the elongated slot define a waveguide configured to form the target RF electromagnetic radiation, when emitted, into a beam. The second station includes a receiver configured to couple to the beam of target RF electromagnetic radiation.

In a general aspect, a communication system comprises a first station and a second station. The first station includes a photonic crystal maser, a laser subsystem, and a tracking subsystem. A photonic crystal structure of the photonic crystal maser is formed of dielectric material and has an array of cavities and an elongated slot. The elongated slot is disposed in a defect region of the array of cavities. The photonic crystal maser also includes a vapor disposed in the elongated slot and operable to emit a target RF electromagnetic radiation in response to receiving an optical signal. The array of cavities and the elongated slot define a waveguide configured to form the target RF electromagnetic radiation, when emitted, into a beam. The second station includes a receiver configured to couple to the beam of target RF electromagnetic radiation.

An electronic device and antenna system for generation of millimeter-wave frequency radiation. The antenna system has first conductive structure, a second conductive structure, and an antenna comprising a first antenna element configured to excite a first electric field having a first polarization, and a second antenna element configured to excite a second electric field having a second polarization. The first antenna element and the second antenna element extend in an antenna plane. An anisotropic dielectric volume is partially enclosed by the antenna, the first conductive structure, and the second conductive structure. A first surface of the dielectric volume is open to the exterior of the antenna system. The dielectric volume allows the first and second electric fields to propagate, within the dielectric volume, from the antenna at least partially towards the first conductive structure, and to radiate from the first surface to the exterior.

An electronic device and antenna system for generation of millimeter-wave frequency radiation. The antenna system has first conductive structure, a second conductive structure, and an antenna comprising a first antenna element configured to excite a first electric field having a first polarization, and a second antenna element configured to excite a second electric field having a second polarization. The first antenna element and the second antenna element extend in an antenna plane. An anisotropic dielectric volume is partially enclosed by the antenna, the first conductive structure, and the second conductive structure. A first surface of the dielectric volume is open to the exterior of the antenna system. The dielectric volume allows the first and second electric fields to propagate, within the dielectric volume, from the antenna at least partially towards the first conductive structure, and to radiate from the first surface to the exterior.

An adjustable polarization converter and an electronic device are provided. The adjustable polarization converter includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate. The first substrate includes a first base substrate and a first electrode on the first base substrate; the second substrate includes a second base substrate and a second electrode on the second base substrate. The first electrode includes a conductive frame and two triangular conductive patches. The conductive frame includes two openings disposed in sequence, and the two triangular conductive patches are disposed in a region surrounded by the conductive frame and are centrally symmetric.

A waveguide polarizer for converting between a linearly polarized electromagnetic field in a first waveguide and a circularly polarized electromagnetic field in a second waveguide is provided. The waveguide polarizer includes a structure interconnecting the first and second waveguide which includes a waveguide excitation arrangement with a bifilar helical shape. A circularly polarized antenna arranged to be connected to the first waveguide of the waveguide polarizer and a satellite arrangement are also provided.

Antenna arrays comprising planar combiner networks. An apparatus includes a first antenna component comprising a first multiplexer and a second antenna component comprising a second multiplexer. The apparatus is such that the first antenna component is located next to the second antenna component within an antenna array and the apparatus is disposed within a lattice spacing of the antenna array.