A base station antenna is provided, including at least two antenna sub-arrays. Each antenna sub-array includes a circuit board and two antenna oscillators. The circuit board includes a circuit substrate, and a first and second power divider disposed on a surface of the circuit substrate. The first and second power divider include a first, second and third end. Each antenna oscillator includes two pairs of first and second oscillator units of which polarizations are orthogonal. The second and third end of the first power divider are respectively electrically connected to the first oscillator unit of a first and second antenna oscillator. The second and third end of the second power divider is respectively electrically connected to the second oscillator unit of the first and second antenna oscillator. Two antenna oscillators form a 4T4R transceiving mode. The base station antenna of the present disclosure has the advantage of simple feeding mode.

Telemedicine systems and methods are described. In a telemedicine system operable to communicate with a remote operations center, communications can be transmitted/received using a transceiver having an antenna. The antenna can include first and second di-pole antenna elements, the first di-pole antenna element being vertically polarized and the second di-pole antenna element being horizontally polarized. A controller of the system can establish, using the transceiver, a telemedicine session with the operations center using a Transport Morphing Protocol (TMP), the TMP being an acknowledgement-based user datagram protocol. The controller can also mask one or more transient network degradations to increase resiliency of the telemedicine session. The telemedicine system can include a 2D and 3D carotid Doppler and transcranial Doppler and/or other diagnostic devices, and provides for real-time connectivity and communication between medical personnel in an emergency vehicle and a receiving hospital for immediate diagnosis and treatment to a patient in need.

Antenna structures and methods of operating the same of a dual-band inverted-F antenna of an electronic device are described. One device includes a single RF feed line coupled to a dual-band inverted-F antenna. The dual-band inverted-F antenna includes a RF feed coupled to the single RF feed line; a ground element; a first arm; a second arm; and a third arm coupled to the ground element. The RF feed is located at a point that is closer to the third arm than a first opening between a distal end of the first arm and the ground element. The second arm is located on an opposite side of the first arm than the ground element, forming a second opening between the second arm and the ground element and a third opening between the second arm and the first arm.

Antenna structures and methods of operating the same of a dual-band inverted-F antenna of an electronic device are described. One device includes a single RF feed line coupled to a dual-band inverted-F antenna. The dual-band inverted-F antenna includes a RF feed coupled to the single RF feed line; a ground element; a first arm; a second arm; and a third arm coupled to the ground element. The RF feed is located at a point that is closer to the third arm than a first opening between a distal end of the first arm and the ground element. The second arm is located on an opposite side of the first arm than the ground element, forming a second opening between the second arm and the ground element and a third opening between the second arm and the first arm.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

A tri-band omnidirectional dual-polarized antenna that includes a dielectric resonator, a first substrate containing a first feeding circuit; and a second substrate containing a second feeding circuit. The first substrate and the second substrate are both planar, which form a sandwiching structure with the dielectric resonator. The first and second feeding circuits are adapted to provide dual polarizations to three frequency bands. The antenna can be used in the tri-band wireless communication systems to provide large signal coverage and stable wireless access for mobile terminals.

A tri-band omnidirectional dual-polarized antenna that includes a dielectric resonator, a first substrate containing a first feeding circuit; and a second substrate containing a second feeding circuit. The first substrate and the second substrate are both planar, which form a sandwiching structure with the dielectric resonator. The first and second feeding circuits are adapted to provide dual polarizations to three frequency bands. The antenna can be used in the tri-band wireless communication systems to provide large signal coverage and stable wireless access for mobile terminals.

An antenna apparatus is provided. The antenna apparatus is formed by using a metal frame of an electronic device. Slots are arranged on both a bottom metal frame and a side metal frame to balance free space radiation efficiency and handheld radiation efficiency. In a free space scene, a portrait mode of an antenna is strong, and free space radiation efficiency is good. When an electronic device is held in the hand, a lateral mode of the antenna is strong, and handheld radiation efficiency is good.

An antenna apparatus is provided. The antenna apparatus is formed by using a metal frame of an electronic device. Slots are arranged on both a bottom metal frame and a side metal frame to balance free space radiation efficiency and handheld radiation efficiency. In a free space scene, a portrait mode of an antenna is strong, and free space radiation efficiency is good. When an electronic device is held in the hand, a lateral mode of the antenna is strong, and handheld radiation efficiency is good.