A quasi-optical coupling system launches and extracts surface wave communication transmissions from a wire. At millimeter-wave frequencies, where the wavelength is small compared to the macroscopic size of the equipment, the millimeter-wave transmissions can be transported from one place to another and diverted via lenses and reflectors, much like visible light. Transmitters and receivers can be positioned near telephone and power lines and reflectors placed on or near the cables can reflect transmissions onto or off of the cables. The lenses on the transmitters are focused, and the reflectors positioned such that the reflected transmissions are guided waves on the surface of the cables. The reflectors can be polarization sensitive, where one or more of a set of guided wave modes can be reflected off the wire based on the polarization of the guided wave modes and polarization and orientation of the reflector.

Multi-radio antenna apparatuses and stations for wireless networks including multiple radios coupled to a single transmit/receive antenna, in which the antenna is highly synchronized by an external (e.g., GPS) signal. These multi-radio antenna systems may provide highly resilient links. Synchronization may allow these apparatuses to organically scale the transmission throughput while preventing data loss. The single transmit/receive antenna may have a single dish or a compound (e.g., a single pair of separate transmitting and receiving dishes) and connections for two or more radios.

Multi-radio antenna apparatuses and stations for wireless networks including multiple radios coupled to a single transmit/receive antenna, in which the antenna is highly synchronized by an external (e.g., GPS) signal. These multi-radio antenna systems may provide highly resilient links. Synchronization may allow these apparatuses to organically scale the transmission throughput while preventing data loss. The single transmit/receive antenna may have a single dish or a compound (e.g., a single pair of separate transmitting and receiving dishes) and connections for two or more radios.

An imaging array fed reflector for a spacecraft is included in a spacecraft payload subsystem. The payload subsystem includes a multi-beam antenna including a reflector, a plurality of amplifiers, and a plurality of radiating feed elements, the feed elements configured as a phased array, illuminating the reflector, operable at a frequency having a characteristic wavelength (λ), and configured to produce, in a far field at the reflector, a set of contiguous abutting beams. The amplifiers are disposed proximate to the plurality of radiating feed elements. Each radiating feed element has a respective coupling with at least one respective amplifier of the plurality of amplifiers. Each radiating feed element, together with the at least one respective amplifier, is disposed in a closely packed triangular lattice such that separation between adjacent radiating feed elements is not greater than 1.5λ.

A quasi-optical beam former includes a set of beam ports, a set of network ports, a quasi-optical device and at least one parallel-plate waveguide extending between the beam ports and the network ports, the beam ports and/or the network ports being superposed in at least two stages, each of the at least two stages being separated by a conductive plane common to two adjacent stages, the quasi-optical beam former comprising a resistive film placed in the continuity of the conductive plane.

A quasi-optical beam former includes a set of beam ports, a set of network ports, a quasi-optical device and at least one parallel-plate waveguide extending between the beam ports and the network ports, the beam ports and/or the network ports being superposed in at least two stages, each of the at least two stages being separated by a conductive plane common to two adjacent stages, the quasi-optical beam former comprising a resistive film placed in the continuity of the conductive plane.

A base station antenna includes a first plurality of first frequency band radiating elements that are arranged as a first linear array of first frequency band radiating elements and as a second linear array of first frequency band radiating elements. The second linear array of first frequency band radiating elements is adjacent the first linear array of first frequency band radiating elements. A first subset of the first plurality of first frequency band radiating elements are slant +/−45° cross-dipole radiating elements that each include at least one −45° dipole arm and at least one +45° dipole arm, and a second subset of the first plurality of first frequency band radiating elements are H/V cross-dipole radiating elements that each include at least one horizontal dipole arm and at least one vertical dipole arm.

A cable antenna an end part of which is connected to an oscillator that supplies a high-frequency current is disclosed. The cable antenna includes: an inner conductor; an insulating layer covering the inner conductor; and an outer conductor covering the insulating layer, wherein only one exposed part is formed in a middle part of the cable antenna in a longitudinal direction, the exposed part formed by removing at least the outer conductor, a distance L between a tip end of the cable antenna and an end of the exposed part on a side closer to the tip end is an odd multiple of a quarter of a wavelength λ of the high-frequency current, the multiplier being three or greater, and a length G of the exposed part in the longitudinal direction satisfies the following formula (1):

$\lambda /20\le \text{G}\text{<}\lambda /4\mathrm{...}$

λ: wavelength (mm) of the high-frequency current.

A cable antenna an end part of which is connected to an oscillator that supplies a high-frequency current is disclosed. The cable antenna includes: an inner conductor; an insulating layer covering the inner conductor; and an outer conductor covering the insulating layer, wherein only one exposed part is formed in a middle part of the cable antenna in a longitudinal direction, the exposed part formed by removing at least the outer conductor, a distance L between a tip end of the cable antenna and an end of the exposed part on a side closer to the tip end is an odd multiple of a quarter of a wavelength λ of the high-frequency current, the multiplier being three or greater, and a length G of the exposed part in the longitudinal direction satisfies the following formula (1):

$\lambda /20\le \text{G}\text{<}\lambda /4\mathrm{...}$

λ: wavelength (mm) of the high-frequency current.

A base station antenna comprises a reflector, a plurality of first radiating elements arranged in a first column that extends in a vertical direction, a plurality of second radiating element arranged in a second column that extends in the vertical direction, and a plurality of parasitic elements, where the parasitic elements are arranged around the first radiating elements and/or second radiating elements. Each parasitic element is configured as a rod-shaped metal part, where a longitudinal axis of the rod-shaped metal part extends at an angle of between 70° to 110° with respect to a plane defined by the reflector, and the parasitic elements are positioned in front of the reflector in and are electrically floating with respect to the reflector.