Aspects described herein relate to receiving, from a device, a first reference signal transmitted using a first set of antenna elements over a first polarization, receiving, from the device, a second reference signal transmitted using a second set of antenna elements over a second polarization, determining, based on the first reference signal and the second reference signal, an inter-polarization phase adjustment to be applied to signals transmitted from the first set of antenna elements or the second set of antenna elements, and transmitting, to the device, an indication of the inter-polarization phase adjustment.

A quad-polarized antenna module is provided for implementing temporal-polarization separation. The quad-polarized antenna module comprises a first radiating element module including a first radiating element and a second radiating element having a polarization direction orthogonal to a polarization direction of the first radiating element, and a second radiating element module including a third radiating element having a polarization direction difference of 45° with respect to the polarization direction of the first radiating element and a fourth radiating element having a polarization direction orthogonal to a polarization direction of the third radiating element The first radiating element module is connected to a transmission line and used to transmit a signal when the second radiating element module is connected to a reception line and used to receive a signal, and is connected to the reception line and used to receive a signal when the second radiating element module is connected to the transmission line and used to transmit a signal.

A quad-polarized antenna module is provided for implementing temporal-polarization separation. The quad-polarized antenna module comprises a first radiating element module including a first radiating element and a second radiating element having a polarization direction orthogonal to a polarization direction of the first radiating element, and a second radiating element module including a third radiating element having a polarization direction difference of 45° with respect to the polarization direction of the first radiating element and a fourth radiating element having a polarization direction orthogonal to a polarization direction of the third radiating element The first radiating element module is connected to a transmission line and used to transmit a signal when the second radiating element module is connected to a reception line and used to receive a signal, and is connected to the reception line and used to receive a signal when the second radiating element module is connected to the transmission line and used to transmit a signal.

An antenna includes an optically transparent substrate layer having a first surface and an opposing second surface; a radiating element having a first mesh structure and disposed on the first surface of the substrate layer; a ground plane having a second mesh structure formed on the second surface of the substrate layer; at least two feed lines configured to connect the radiating element to an external circuit; and at least two stubs connected to the radiating element.

An apparatus and method for wavelength conversion of a signal, for example, a dual-polarization signal, is disclosed. The apparatus implements a single-loop counter-propagating wavelength conversion scheme which provides both up-conversion and down-conversion of the signal within the same loop. Nonlinear wavelength conversion devices in the loop provide both up-conversion and down-conversion of the polarization components of the signal within the loop depending on whether the polarization component travels through the nonlinear conversion device in a clockwise or a counter-clockwise direction. The wavelength-converted signal is available to be extracted from the wavelength-conversion loop. An all-optical wavelength-division multiplexing transponder based on the wavelength-conversion scheme is also disclosed.

An apparatus and method for wavelength conversion of a signal, for example, a dual-polarization signal, is disclosed. The apparatus implements a single-loop counter-propagating wavelength conversion scheme which provides both up-conversion and down-conversion of the signal within the same loop. Nonlinear wavelength conversion devices in the loop provide both up-conversion and down-conversion of the polarization components of the signal within the loop depending on whether the polarization component travels through the nonlinear conversion device in a clockwise or a counter-clockwise direction. The wavelength-converted signal is available to be extracted from the wavelength-conversion loop. An all-optical wavelength-division multiplexing transponder based on the wavelength-conversion scheme is also disclosed.

Antenna arrays include a first plurality of radiating elements in a first column thereof, which are responsive to a first plurality of RF feed signals derived from a first radio, and a second plurality of radiating elements in a second column thereof, which are responsive to a second plurality of RF feed signals derived from a second radio. A power divider circuit is provided, which is configured to drive a first one of the radiating elements at a first end of the second column of radiating elements with a majority of the energy associated with a first one of the first plurality of RF feed signals, and drive a first one of the radiating elements at a first end of the first column of radiating elements with a non-zero minority of the energy associated with the first one of the first plurality of RF feed signals.

Antenna arrays include a first plurality of radiating elements in a first column thereof, which are responsive to a first plurality of RF feed signals derived from a first radio, and a second plurality of radiating elements in a second column thereof, which are responsive to a second plurality of RF feed signals derived from a second radio. A power divider circuit is provided, which is configured to drive a first one of the radiating elements at a first end of the second column of radiating elements with a majority of the energy associated with a first one of the first plurality of RF feed signals, and drive a first one of the radiating elements at a first end of the first column of radiating elements with a non-zero minority of the energy associated with the first one of the first plurality of RF feed signals.

The antenna includes: a reflective member including a flat part; a first antenna element disposed on the flat part of the reflective member, the first antenna element being configured to transmit and receive radio waves of a first polarization; a second antenna element disposed on the flat part of the reflective member, one end of the second antenna element being located close to one end of the first antenna element, the second antenna element being configured to transmit and receive radio waves of a second polarization different from the first polarization; and a conductive member disposed close to the one ends of the first antenna element and the second antenna element and near a point of intersection where the first antenna element and the second antenna element meet when extended.

A multiple-input multiple-output (MIMO) antenna system for a mobile cellular network and method is described. The MIMO antenna system includes an array of dual-polarization patch antennas each having first and second polarization feed-points, a first polarization radio chain and a second polarization radio chain. The MIMO antenna system includes a beamformer coupled to the first and second polarization radio chains. The beamformer includes a beamformer channel for a respective feedpoint and further includes a transmit amplifier and a detector (coupler) coupled to a transmit amplifier output. In one mode of operation, a signal is transmitted via the first polarization feed-point of a dual-polarisation patch antennas and a replica of the transmitted signal may be sensed using the coupler at the output of the transmit amplifier and routed via the second polarization radio chain to a digital predistortion module. The digital pre-distortion module is configured to digitally pre-distort a signal for transmission dependent on the replica of the RF signal.