In an example, an electronic device includes a conductive housing. The conductive housing may include a first slot, a second slot, and a bridge portion to separate the first slot and the second slot. Further, the electronic device may include an antenna layout disposed across the first slot, the second slot, and the bridge portion. Furthermore, the electronic device may include an antenna feed coupled to the antenna layout in the first slot and an antenna ground coupled to the antenna layout in the second slot.

A phased array antenna system comprising a plurality of isotropic radiating elements and/or omnidirectional receiving elements addressing close in fields and a plurality of non-isotropic radiating elements and/or non-omnidirectional receiving elements addressing remote fields with the combined elements used to extend the maximum range of the antenna system without increasing the number of element nor the output power of the antenna. The non-isotropic radiating elements and/or the non-omnidirectional receiving elements can be formed by adding focusing structures such as lenses or reflective structures in the radiating path of isotropic radiating elements and/or omnidirectional receiving elements. Antennas with combined isotropic radiating and non-isotropic radiating elements can be utilized for electromagnetic phased array radar, communication and imaging systems and for acoustic phased array sonar or ultrasound systems.

Provided herein are various enhanced arrangements for arrays of aperture antennas, such as horn antennas or short backfire antennas. Examples include an array of aperture antennas having a wall thickness between apertures, and a conductive mesh positioned above the apertures such that openings of the conductive mesh are aligned with the apertures and positioned having a selected spacing between the conductive mesh and the apertures.

Disclosed is a ridge guide waveguide including a conductive base, a conductive ridge protruding upward from the conductive base and extending along a predetermined wave transmission direction, an upper conductive wall located over the conductive base and the conductive ridge and spaced apart from the conductive ridge by a gap, and an electromagnetic bandgap structure arranged adjacent to the conductive ridge between the conductive base and the upper conductive wall.

A communication device is made with a metallic frame having an interior mounting surface for receiving one or more functional components. The metallic frame includes a first frame member having a first portion extending uninterrupted across one lateral side of the metallic frame. The first portion provides structural support to the communication device. A T-shaped slot antenna is formed in a second portion of the first frame member adjacent to the first portion. The T-shaped slot antenna has first and second arms separated at a gap and partially encompassing a slot. The second portion of the first frame member enables radio frequency communication by at least one of the functional components via the T-shaped slot antenna of the communication device.

An active biconical antenna and a receive array comprising a combination of active biconical and Vivaldi antennas. In one configuration, the active biconical antenna includes upper and lower cones. Each cone has a respective truncated apex. First and second feed points are respectively connected to the truncated apexes of the upper and lower cones and to first and second conductors. The active biconical antenna further includes a buffer amplifier having respective input terminals connected to the first and second conductors. The buffer amplifier has an input impedance that is impedance matched to an antenna impedance at and above but not below a frequency f.sub.c and is higher than the antenna impedance at frequencies substantially less than f.sub.c. The buffer amplifier also has an output impedance that is impedance matched to a system impedance at frequencies both above and below f.sub.c. A length of the first and second conductors is less than a wavelength at the frequency f.sub.c.

An active biconical antenna and a receive array comprising a combination of active biconical and Vivaldi antennas. In one configuration, the active biconical antenna includes upper and lower cones. Each cone has a respective truncated apex. First and second feed points are respectively connected to the truncated apexes of the upper and lower cones and to first and second conductors. The active biconical antenna further includes a buffer amplifier having respective input terminals connected to the first and second conductors. The buffer amplifier has an input impedance that is impedance matched to an antenna impedance at and above but not below a frequency f.sub.c and is higher than the antenna impedance at frequencies substantially less than f.sub.c. The buffer amplifier also has an output impedance that is impedance matched to a system impedance at frequencies both above and below f.sub.c. A length of the first and second conductors is less than a wavelength at the frequency f.sub.c.

A radar system includes a split-block assembly unit comprising a first portion and second portion, where the first portion and the second portion form a seam. The radar system further includes a plurality of ports located on a bottom side of the second portion opposite the seam. Additionally, the radar system includes a plurality of radiating elements located on a top side of the first portion opposite the seam. The plurality of radiating elements is arranged in a plurality of arrays. The plurality of arrays includes a set of multiple-input multiple-output (MIMO) transmission arrays, a set of synthetic aperture radar (SAR) transmission arrays, and at least one reception array. Further, the radar system includes a set of waveguides configured to couple each array to a port.

Examples disclosed herein relate to a radiating structure. The radiating structure has a transmission array structure having a plurality of transmission paths, with each transmission path having a plurality of slots. The radiating structure also has a radiating array structure of a plurality of radiating elements, with each radiating element corresponding to at least one slot from the plurality of slots, and at least one radiating element from the plurality of radiating elements comprising an integrated reactance control device. The radiating array structure is positioned proximate the transmission array structure. A feed coupling structure is coupled to the transmission array structure and adapted for propagation of a transmission signal to the transmission array structure, the transmission signal radiated through at least one of the plurality of slots and at least one of the plurality of radiating elements, the at least one reactance control device providing a phase shift in the radiated transmission signal.

An antenna includes: a dielectric layer having first and second surfaces opposite to each other; a radiating layer on the first surface, and having therein a slit; a first shielding layer on the second surface, and being electrically connected to the radiating layer; a first insulating layer on an upper side of the radiating layer; and a switch unit on an upper side of the first insulating layer, and corresponding to the slit. Each switch unit includes: a first electrode, a second insulating layer, a connecting portion, and a second electrode on the first insulating layer sequentially. Orthogonal projections of the first and second electrodes on the dielectric layer overlap each other. The connecting portion is connected to the second electrode to form a gap between the first and second electrodes. Orthogonal projections of the second electrode and a corresponding slit on the dielectric layer overlap each other.