Broadband antennas are described that include a quad-ridge horn inside which two different lenses are inserted creating a broadband horn-lens combination. One of these lenses is a cross-polyrod lens, formed from a pair of polyrods disposed in a crossed arrangement, each polyrod shaped in a predetermined manner. The other one of these lenses is a prolate spheroidal lens. The broadband antennas can produce, at the output thereof, Gaussian-like beams in both principal polarizations from VHF to 20 GHz. As such, the broadband antennas can be used to perform material measurements in a compact admittance tunnel. Simulation results show that directivity of quad-ridge horns can be improved using the combination of lenses of the broadband antennas. Therefore, the broadband antennas can also be of interest for far-field radiation applications.

An antenna device includes an electrical conductor including an electrically conductive surface and a slot in the electrically conductive surface, a pair of electrically-conductive side walls on opposite sides of the slot and protruding from the electrically conductive surface and flanking each other along a first direction, and each side wall extending along a second direction intersecting the first direction, and a pair of electrically-conductive ridges each protruding from the electrically conductive surface and extending along the second direction and including an end surface, the respective end surfaces of the pair of ridges opposing each other via a gap overlapping a central portion of the slot as viewed from a third direction perpendicular to the electrically conductive surface. A waveguide continuous with an external space is defined in a space inside the slot and between the end surfaces of the pair of ridges.

A method of producing a waveguide-to-coaxial adapter array includes applying solder paste to inner surfaces of throughholes of an electrical conductor, inserting coaxial connectors respectively in the throughholes from a first surface of the conductor so that cores of the throughholes respectively become located at the inner surfaces of the throughholes, inserting one or more fixtures including a flat surface in the throughholes from a second surface of the conductor that is opposite to the first surface, so that the flat surface of the fixture(s) contacts the cores of the coaxial connectors and that the cores of the coaxial connectors are held against the inner surfaces of the throughholes, connecting the cores of the coaxial connectors respectively to the inner surfaces of the throughholes by melting the solder paste, and disengaging the fixture(s) from the throughholes.

The present invention discloses an antenna system including a sub-array rectangular speaker having a metal substrate and a circuit board with 4 electrically connected sub-boards, 4 insolate layers and 4 feeding components. The sub-board includes a first feed point and a second feed point for electrically connecting to corresponding feeding components. Each of the speakers includes sidewalls and rigid walls for electrically connected to the first and second feed points. The present invention further provides a communication terminal using such an antenna.

In accordance with one or more embodiments, a system includes an array of antennas. A plurality of transceivers is configured to generate first signals, in response to control signals. A controller is configured to generate the control signals to control, via the plurality of transceivers, an antenna aperture of the array of antennas. The array of antennas is configured to generate, in response to first signals, radiated waves according to the antenna aperture of the array of antennas, the radiated waves inducing a first guided electromagnetic wave that is guided by a surface of a transmission medium and propagates along the transmission medium without requiring an electrical return path.

A method, system, and device provides components of an antenna assembly. Digital information representative of one or more characteristics of an antenna element of antenna assembly may be received by a processor. The processor may further receive a specification for the antenna element. The processor may adjust digital information representative of the antenna element to adjust the physical parameters of the component to meet the specification. The antenna assembly may be fabricated with the adjusted physical parameters.

A horn antenna includes a horn including a horn inner surface and a horn bottom including a horn bottom surface. The horn bottom includes a radiation portion which emits a radio wave at a position that deviates from the center of the horn bottom surface. The horn bottom surface extends farther in a first direction. The position of the radiation portion deviates from the center of the horn bottom surface in the first direction. The radiation portion is a slot which is opened in the horn bottom surface. A direction of supplying power to the slot is a second direction which is in parallel or substantially in parallel with the horn bottom surface and perpendicular or substantially perpendicular to the first direction.

In various implementations, a quasi-monostatic STAR antenna system comprises a parabolic reflector antenna for transmission (TX) and a receiving (RX) antenna mounted back-to-back with the reflector feed. The physical size of the RX antenna can be comparable to or smaller than that of the TX feed, in order to prevent additional reflector blockage. To increase the system isolation both the TX feed and the RX antenna are CP. In one implementation, for example, to achieve same TX and RX polarization (i.e. no polarization multiplexing) the TX feed is LHCP and the RX antenna is RHCP. The LHCP fields from the TX feed undergo polarization reversal after bouncing back from the reflector. Thereby, the TX and RX operate in the same polarization, as illustrated in FIG. 1. This approach can also support simultaneous dual polarized operation if appropriate feed and RX antenna are used

An antenna array includes a first conductor, a second conductor, waveguiding walls, and conductive rods. The waveguiding walls and the conductive rods are disposed between the first and second conductors. The first conductor includes hollows respectively defining horns each defining and functioning as an antenna element. Each hollow opens in the first conductive surface and in the second conductive surface. The second conductor includes through holes that overlap the hollows. On the inner surface of each through hole, a core wire of the coaxial cable, or another electrical conductor that is connected to the core wire, is connected. Each waveguiding wall surrounds at least a portion of a space between one of hollows and one of the through holes. The conductive rods are located around the waveguiding walls.

In accordance with one or more embodiments, a system includes an array of antennas. A plurality of transceivers is configured to generate first signals, in response to control signals. A controller is configured to generate the control signals to control, via the plurality of transceivers, an antenna aperture of the array of antennas. The array of antennas is configured to generate, in response to first signals, radiated waves according to the antenna aperture of the array of antennas, the radiated waves inducing a first guided electromagnetic wave that is guided by a surface of a transmission medium and propagates along the transmission medium without requiring an electrical return path.