In various implementations, designs of relatively simple ultra-wideband STAR front-end systems are provided. For example, such systems may include implementations utilizing a plurality of antenna arms in which a first portion of the arms is configured to transmit and a second portion of the arms is configured to receive. In one implementation, for example, a co-channel simultaneous transmit and receive (STAR) monostatic aperture configuration includes a single-polarized multi-port monostatic co-channel simultaneous transmit and receive (c-STAR) spiral antenna aperture. Other examples are also provided.

A user terminal includes a reconfigurable phased array antenna having a plurality of antenna elements. The user terminal is operable for: broadening a field of regard of the reconfigurable phased array antenna; receiving signals from a plurality of satellites within the field of regard using the reconfigurable phased array antenna; determining one or more attributes of the received signals for each of the satellites; and selecting one of the plurality of satellites for communication based on the attributes of the received signals. After the satellite has been selected, the user terminal is configured for: switching to a directional mode for the reconfigurable phased array antenna; establishing the communication with the selected satellite using the reconfigurable phased array antenna; and tracking the selected satellite. Ephemeris data broadcast by the satellites is used by the user terminal to track the satellites and to perform handovers between satellites.

A method for ground to air communication includes receiving a first pilot signal on a first wide beam from a first ground base station by a first antenna element covering a first range of azimuth angles from an aircraft. Data is received on a directed data beam from the first ground base station by the first antenna element. A second pilot signal is received on a second wide beam from a second ground base station by a second antenna element covering a second range of azimuth angles different than the first range of azimuth angles. A signal strength of the second pilot signal is compared with a signal strength of the first pilot signal. Data reception is switched from the first antenna element to the second antenna element if the signal strength of the second pilot signal is greater than the signal strength of the first pilot signal.

An antenna module includes a dielectric substrate and a radiation element disposed on the dielectric substrate. The dielectric substrate includes a flat portion (131) and a flat portion (130) having mutually different normal directions, and a bent portion connecting the flat portion (131) and the flat portion (130) to each other. The flat portion (131) has a protruding portion partially protruding in a direction toward the flat portion (130) along the flat portion (131) from a boundary portion between the bent portion and the flat portion (131). The flat portion (131) and the bent portion are connected to each other at a position where the protruding portion is not provided in the flat portion (131). At least a part of the radiation element is disposed on the protruding portion.

An antenna system capable of achieving simultaneous transmit and receive (STAR) operation over a wide bandwidth includes a ring array of TEM horn elements and a centrally located monocone or bicone antenna. The TEM horn elements each include a capacitive feed. The elements of the ring array are excited using a phasing scheme that results in signal cancellation at the location of the central element. The ring array may serve as either the transmit antenna or the receive antenna.

An antenna includes antenna structure configured to receive electromagnetic radiation and including an antenna geometry. The antenna geometry is configured to cause a variable phase shift in the electromagnetic radiation based on an angular position of a direction of propagation of the electromagnetic radiation relative to azimuth. An angle-of-arrival sensor includes the antenna configured to the receive electromagnetic radiation and to produce a phase-shift signal. A method for determining an angle of arrival of electromagnetic radiation uses the angle-of-arrival sensor.

An embodiment of an integrated stripline feed network for a linear antenna array comprises a power distribution network coupled to the linear antenna array; a feed signal input/output component coupled to the power distribution network; wherein the input/output component receives a feed signal and splits the feed signal for distributing to a plurality of antenna elements of the linear antenna array through the power distribution network. The integrated stripline feed network is configured to be integrated into a support body of the linear antenna array, wherein, the support body structurally supports the linear antenna array.

Methods for sensing formation properties while drilling a well are described. An antenna system and transceiver electronics system are disposed on a drill collar segment. The antenna system includes at least one transmitter antenna for creating an electromagnetic field and at least one receiver antenna for detecting the electromagnetic field. At least one antenna in the antenna system is a magnetic dipole based antenna having at least two slot based magnetic dipoles. The slot based magnetic dipoles include slots in an outer surface of the drill collar segment, wire holes beneath the outer surface connecting the slots with each other and with the transceiver electronics system, a ferrite rod placed in each slot, and, at least one continuous antenna wire passing through the slots and the wire holes.

A metrocell antenna includes a plurality of linear arrays of first frequency band radiating elements, a first enclosure that includes a first of the linear arrays of first frequency band radiating elements mounted therein, a second enclosure that includes a second of the linear arrays of first frequency band radiating elements mounted therein, a third of the linear arrays of first frequency band radiating elements mounted within one of the first and second enclosures, a first RF port that is mounted through the first enclosure and a first blind-mate connector that provides an electrical connection between the first enclosure and the second of the linear arrays of first frequency band radiating elements that is mounted in the second enclosure.

Omni-directional orthogonally-polarized antenna system for MIMO applications are disclosed herein. An example antenna system can have two arrays of horizontally polarized radiating elements, and two arrays of vertically polarized radiating elements, each array having roughly 180-degree radiation pattern, disposed about a central axis in a common horizontal plane, arrays of common polarization separated by 180-degrees, such that MIMO processing of signals to the arrays of common polarization results in a radiation pattern that is substantially constant over 360-degrees in azimuth.