Abstract: This document a two-part folded waveguide with horns. For example, a waveguide includes a channel with an opening in a longitudinal direction at one end, and a sinusoidal shape that folds back and forth about a longitudinal axis that runs in the longitudinal direction through the channel. One part of the waveguide defines a surface of the channel featuring a plurality of radiation slots in the shape of a horn, which allows the two parts of the waveguide to be arranged and configured as one component. A first part of the waveguide has slots and an upper half of the walls of the channel and a second part provides a lower half of the walls of the channel and a surface of the channel opposite the slots. Using horns in combination with two parts enables ease of manufacturing a waveguide with an internal channel having a folded or sinusoidal shape.

Abstract: A filter device having desired characteristics is easily designed. The filter device includes a post-wall waveguide functioning as a resonator group including five congruent resonators (R1 to R5). The resonators (R1, R2) include therein respective control posts (CP1, CP2), and a shortest distance (di) from the control post (CPi) to a narrow wall of the resonator (Ri) satisfies d1>d2. The resonators (R4, R5) include therein respective control posts (CP4, CP5), and a shortest distance (dj) from the control post (CPj) to a narrow wall of the resonator (Rj) satisfies d4<d5.

Abstract: A calibration device for an antenna includes a dielectric substrate and a metal pattern printed on the dielectric substrate. The metal pattern includes at least a portion of a calibration circuit, where a first portion of the calibration circuit is on a first major surface of the dielectric substrate, a second portion of the calibration circuit is on an opposed second major surface of the dielectric substrate. The first portion and/or the second portion of the calibration circuit may be constructed as coplanar waveguide transmission lines.

Abstract: An antenna includes a waveguide defined by a gap between a backplane with radial support ribs and a facesheet, a teardrop-shaped feed pin at a center of the backplane, and a foam spacer between the backplane and facesheet. An outward facing side of the facesheet includes thermal paint. The facesheet includes pairs of through-hole slots for releasing portions of a wave of radiation in the waveguide to generate a transmit-beam or to receive the receive-beam to generate the wave of radiation. The pairs may be disposed as a spiral array about a center of the facesheet. Each of the pairs may include first and second slots. A length of the second slot is oriented approximately perpendicular to a length of the first slot. Dispositions of the slots are set by a computer process. The dispositions optimize a trade-off between transmit and receive gains.

Abstract: This document describes a waveguide with radiation slots and parasitic elements for asymmetrical coverage. An apparatus may include a waveguide for providing asymmetrical coverage in an azimuth plane. The waveguide includes a hollow channel containing a dielectric and an array of radiation slots through a surface that is operably connected with the dielectric. The waveguide includes an array of parasitic elements positioned on or in the surface and offset from a longitudinal side of the array of radiation slots. The radiation slots and parasitic elements configure the described waveguide to focus an antenna radiation pattern that provides an asymmetrical coverage to focus on a particular portion within the antenna field-of-view.

Abstract: An agent activated non-metal antenna for an ultra-high frequency (UHF) wireless sensor having a radio frequency identification (RFID) tag in electronic communication with the non-metal antenna, and a wireless data communication integrated circuit (IC), includes a conductive stimuli-responsive hydrogel material configured to be inactive prior to an interaction with an activating agent and active upon the interaction with the activating agent. The antenna is further configured to transmit power to turn on the wireless data communication IC only when the non-metal antenna is active upon interaction with the activating agent.

Abstract: Waveguide and/or antenna structures for use in RADAR sensor assemblies and the like. In some embodiments, an antenna module may comprise a waveguide and an antenna structure, such as one or more slots/slits operably coupled with the waveguide groove. The antenna structure may be positioned and configured to deliver electromagnetic radiation from the waveguide therethrough. A plurality of tapering surfaces may be formed along the antenna structure. Each of the plurality of tapering surfaces may be formed so as to alternate between opposing sides of the antenna structure and be spaced apart from each adjacent tapering surface of the plurality of tapering surfaces.

Abstract: This document describes techniques, apparatuses, and systems for a waveguide with lobe suppression. A waveguide is described that includes a pipe for containing a dielectric, the pipe defining an open end to a longitudinal direction through the pipe. An array of radiating slots is formed through a surface of the pipe and in communication with the dielectric. To suppress grating lobes in an antenna pattern, the waveguide includes at least one parasitic groove that is separate from the pipe and with at least a portion of a length that is parallel to the array of radiating slots. In this way, the waveguide provides an antenna pattern where grating lobes are suppressed or substantially reduced.

Abstract: The present invention provides an open-aperture waveguide fed slot antenna including a feeding section on a substrate integrated waveguide, an H-shaped slot, a matched end, and a bottom metal layer. One end of the feeding section is open and connected to the slot, providing energy feeding to the slot. A long side of the center section of the slot is connected to a top metal part of the feeding section. Another side is connected to the matching end. The matching end includes metal which is connected to the slot, the metallic via wall and the bottom metal of the feeding section which is connected to the metallic via wall. The antenna has high gain, wide gain bandwidth, a simple structure, and low processing cost and can be applied to millimeter-wave frequency bands as well as other frequency bands.

Abstract: A cavity slotted-waveguide antenna array has several waveguide columns disposed in parallel in a housing. Several of the waveguide columns being provided with cavity slots on the front side of the housing. The housing includes a front part secured to a rear part, with a rear portion of the waveguide columns being formed in the rear part, and with a front portion of the waveguide columns being formed in said front part. The waveguide columns can have a rectangular cross-section, with the columns defined by two opposing wide inner surfaces, a narrow inner back surface, and a narrow inner front surface, with the plurality of cavity slots extending from the front side of the housing to said narrow inner front surface. A signal probe is disposed in the columns. Conductive parallel plate blinds are conductively secured to the front side of the housing.

Abstract: Disclosed is a radar for a vehicle configured to detect objects around a vehicle using an antenna, and the radar includes a substrate-integrated waveguide (SIW) in which a plurality of bent slots is formed, at least one processor electrically connected to the substrate-integrated waveguide, and a differential line electrically connecting the substrate-integrated waveguide to the at least one processor.

Abstract: Technologies directed to a slot antenna as a calibration antenna for a phased array antenna are described. The antenna structure includes a ground plane, a first antenna element, and a second antenna element. The first antenna element and the second antenna element are located in a first plane that is separated from the ground plane by a first distance. The second antenna element is separated from the first antenna element by a second distance. Conductive material is located in the first plane the first antenna element and the second antenna element. A portion of the conductive material adjacent to the first antenna element includes a slot antenna. A radio frequency feed point is located at the slot antenna. The conductive material electrically isolates the first antenna element and the second antenna element and radiates electromagnetic energy as a slot antenna.

Abstract: Transitional elements to offset a capacitive impedance in a transmission line are disclosed. Described are various examples of transitional elements in a multilayer substrate that introduce a transitional reactance to cancel the transmission line capacitive effects. The transitional elements reduce insertion loss.

Abstract: An apparatus and method for orthogonal rotation of a radiation E-field polarization rely on a radiating element including an offset-ridge waveguide and a single-mode first ridge waveguide functionally adjacent to the offset-ridge waveguide.

Abstract: A body part for a motorized land vehicle is provided. The body part includes at least one wall made of a plastic material and including at least one housing forming a cavity for electromagnetic waves, said housing includes: at least one transceiver for transmitting and/or receiving an electromagnetic wave in said housing; at least one adaptable surface capable of reflecting the electromagnetic wave transmitted by the transceiver in a given direction (in a controlled manner) and, conversely, capable of reflecting the electromagnetic wave coming from the exterior of the housing toward the transceiver.

Abstract: Examples disclosed herein relate to a radiating structure having a plurality of slotted transmission lines, each transmission line including a plurality of boundary lines defining each transmission line, wherein slots are positioned in each transmission line and include a first set of slots interspersed with a second set of slots, the second set of slots having a size smaller than the first set of slots, and a plurality of irises positioned proximate each of the slots and along the length of each transmission line. The radiating structure also has an array of radiating elements proximate the slotted transmission lines so as to receive a transmission signal from the slotted transmission lines and generate a radiation pattern corresponding to the transmission signal.

Abstract: An electromagnetic wave radiator may include: a first metal layer; a plurality of metal side walls vertically protruding along an edge of the first metal layer; and a second metal layer suspended over the first metal layer. The second metal layer includes a plurality of ports radially extending from edges of the second metal layer and a plurality of slots penetrating the second metal layer in a radial direction.

Abstract: A multipaction-proof waveguide filter includes a main cavity and a number of corrugations extending from the main cavity. The main cavity includes corrugation interconnect regions between the plurality of corrugations. The corrugation interconnect regions include sloped surfaces, and the corrugations include flared nonparallel sidewalk. Due to the introduced sloped surfaces and flares, an increased Q is achieved, improved roll off is observed and multipaction risks are mitigated.

Abstract: Wireless communication systems for a vehicle, such as a train, are disclosed. In an embodiment, the wireless communication system includes a communication unit, an antenna, a power cable, a data transferring path, and a protective shield. The communication unit is arranged inside the vehicle. The antenna is provided on or above an exterior metal surface, such as the roof, of the vehicle. The power cable and the data transferring path connect the antenna and the communication unit. The protective shield is made of a conductive material, and is electrically and mechanically bonded to the exterior metal surface of the vehicle. The protective shield includes a cavity for accommodating the antenna, and at least one waveguide aperture extends through the protective shield and into the cavity.

Abstract: A waveguide antenna is disclosed, comprising: a first plurality of slots, for producing a beam having a first radiation pattern at a first resonant frequency; and a second plurality of slots, for producing a beam having a second radiation pattern at a second resonant frequency. A method of operation of the waveguide antenna is also disclosed, comprising: operating the transceiver at a first frequency to detect objects in a first field of view; and operating the transceiver at a second frequency to detect objects in a second field of view.

Abstract: In patent application Ser. No. 15,934563, a method was developed that achieves wave rotation or shaping in the near field and far field, for narrowband RF Signals. That is, using an acoustic or RF phased array, the effective wavefront can be rotated from the propagation normal, at a selected location region in space. In this innovation, the application has been extended to Wideband Signals, where the signal bandwidths can highly exceed the one-percent of carrier frequency narrowband threshold.

Abstract: A liquid crystal phase shifter is disclosed. The liquid crystal phase shifter includes a liquid crystal cell, a partition plate, a first microstrip line, a second microstrip line and liquid crystal molecules. The liquid crystal cell includes a first substrate and a second substrate disposed opposite to each other; the partition plate is disposed between the first substrate and the second substrate; the first microstrip line is disposed on a surface of the partition plate away from the second substrate; the second microstrip line is disposed on a surface of the partition plate away from the first substrate; and the liquid crystal molecules are provided between the first substrate and the partition plate, and between the second substrate and the partition plate.

Abstract: The present invention provides an antenna device including a ground conductor plate 1 having a first circular hole 6, a disc-shaped conductor plate 5 which has a second circular hole 7 whose center is disposed on a straight line passing through a center of the first hole 6 and orthogonal to the ground conductor plate 1, has a center that coincides with the center of the second hole 7, and is disposed substantially parallel to the ground conductor plate 1, a first linear conductor 4 having a first end passing through the first hole and a second end passing through the second hole, a second linear conductor 3 having a first end connected to the second end of the first conductor and disposed substantially parallel to the ground conductor plate, and an antenna element 2 connected to a second end of the second conductor.

Abstract: A radar sensing system for a vehicle includes a radar sensor disposed at the vehicle so as to have a field of sensing exterior of the vehicle. The radar sensor includes a plurality of transmitters that transmit radio signals, a plurality of receivers that receive radio signals, and a plurality of antennas that communicate the radio signals to the receivers and from the transmitters. The received radio signals are transmitted radio signals that are reflected from an object. A processor is operable to process outputs of the receivers to detect the object. At least some of the antennas of the radar sensor include non-rectangular slot antennas each having a slot that includes a longitudinal portion and a transverse portion that extends transverse in at least one direction from the longitudinal portion. The non-rectangular slot provides an enhanced radiation pattern of the transmitted radio signals.

Abstract: A device includes a multilayer substrate having a first surface and a second surface opposite the first surface. An integrated circuit is mounted on the second surface of the multilayer substrate, the integrated circuit having transmission circuitry configured to process millimeter wave signals. A substrate waveguide having a substantially solid wall is formed within a portion of the multilayer substrate perpendicular to the first surface. The substrate waveguide has a first end with the wall having an edge exposed on the first surface of the multilayer substrate. A reflector is located in one of the layers of the substrate and is coupled to an edge of the wall on an opposite end of the substrate waveguide.

Abstract: Systems and methods are disclosed herein for printed cavities for computational microwave imaging and methods or use. According to an aspect, an imaging system includes a printed cavity having a layer having a first surface and a second surface. The printed cavity defines multiple apertures that extend between the first surface and the second surface. The printed cavity also includes a substrate being attached to the first surface of the layer. The substrate is also configured to be fed a guided wave that excites the apertures to produce a radiation pattern for illuminating a scene. The imaging system also include one or more antennas configured to generate a signal for imaging based on the illuminated scene.

Abstract: A radar assembly includes a monolithic-microwave-integrated-circuit (MMIC), an antenna-element, and a single printed-circuit-board (PCB). The MMIC includes an arrangement of solder-balls configured to couple radar-signals into or out of the MMIC. The antenna-element includes a ridge-air-waveguide configured to propagate radar-signals to or from one or more radiation-slots of the antenna-element. The PCB is directly attached to the MMIC. The PCB includes a transition-feature configured to couple radar-signals between the arrangement of solder-balls and the ridge-air-waveguide. The transition-feature is characterized as a slot that extends between the arrangement of solder-balls and the ridge-air-waveguide. The transition-feature may be an L-shaped-slot or a U-shaped-slot. The assembly is designed/configured to be compatible with known printed circuit board fabrication processes.

Abstract: A coaxial-waveguide-to-hollow-waveguide transition circuit (1) includes a hollow waveguide (10), a coaxial waveguide (20) having an end coupled to a wide wall (16) of the hollow waveguide (10), and a strip conductor (30) located inside the internal path (10h) of the hollow waveguide (10). The coaxial waveguide (20) includes a conducting core wire (22) extending into the internal path (10h) of the hollow waveguide (10). The strip conductor (30) is located so as to make a short-circuit connection between the conducting core wire (22) of the coaxial waveguide (20) and a termination surface (12) of the hollow waveguide (10).

Abstract: The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.

Abstract: Systems and methods of controlling signal polarization for an antenna system are provided herein. The antenna system includes an ultra wide band or greater array of dual linear polarization elements. The antenna system also includes polarization synthesis networks. Each of the polarization synthesis networks is coupled to the first differential interface of the first element of a respective dual linear polarization element of the dual linear polarization elements and the second differential interface of the second element of the respective the dual linear polarization element of the dual orthogonal linear polarization elements. Each of the polarization synthesis networks has a flat response for phase shift and amplitude over the ultra wide bandwidth.

Abstract: An arrangement (10) comprising a first conductive antenna element (20), comprising at least one first slot (30; 31, 32, 33, 34; 35, 36) arranged in the first conductive antenna element (20), and a second conductive antenna element (80), comprising at least one second slot (90; 91, 92, 93, 94; 31; 32, 33, 34) arranged in the second conductive antenna element (80), is disclosed. At least one second slot (90; 91, 92) arranged in the second conductive antenna element (80) is coupled with at least one first slot (30; 35, 36) arranged in the first conductive antenna element (20) by means of at least one conductor (111, 112; 113, 114, 115, 116).

Abstract: This disclosure is directed to techniques to improve the mechanical reliability and strength of slot array antennae created using printed circuit board (PCB) technology. In some examples, a multi-layer PCB may have a limit on the length and width dimensions. Therefore, a larger slot array antenna may require two or more PCBs to create the full size of the antenna. This disclosure describes techniques to securely connect the two or more PCBs to withstand environments where the slot array antenna may be placed under mechanical stress, such as vibration. A PCB based antenna may define the walls of radiating waveguides with vias between the layers of the PCB. Mechanical fasteners may pass through some of the existing vias to secure the PCB to a support structure, such as a feeding waveguide, as well as to secure one PCB to other PCBs.

Abstract: A shared-aperture antenna includes a first copper metal layer; a second copper metal layer; and a dielectric substrate layer sandwiched between the first copper metal layer and the second copper metal layer. The dielectric substrate layer includes a plurality of metallized vias. The first copper metal layer is in communication with the second copper metal layer via the plurality of metallized vias. The plurality of metallized vias includes first metallized vias forming an inner circular ring and second metallized vias forming an outer circular ring with respect to the center of the antenna. The first copper metal layer, the dielectric substrate layer, the second copper metal layer, and the first metallized vias form a substrate integrated waveguide (SIW) circular cavity slot antenna. The first copper metal layer, the dielectric substrate layer, the second copper metal layer, the first metallized vias and the second metallized vias form a coaxial cavity slot antenna.

Abstract: An apparatus comprises: a polarization generator to receive first and second signals, apply to the first and second signals two-dimensional (2D) complex weights to produce 2D weighted complex signals that represent a polarization having a plane of polarization referenced to three-dimensional (3D) orthogonal axes, operate on the 2D weighted complex signals to rotate the plane of polarization angularly with respect to the 3D orthogonal axes, and produce 3D controlled complex signals representing the polarization with the rotated plane of polarization; quadrature upconverter-modulators to modulate the 3D controlled complex signals, to produce 3D modulated radio frequency (RF) signals; and a triaxial antenna including orthogonal 3D linearly polarized elements to receive respective ones of the 3D modulated RF signals and collectively convert the 3D modulated RF signals to radiant RF energy that has the polarization with the rotated plane of polarization.

Abstract: A waveguide-to-parallel-plate twist transition includes at least one waveguide-to-parallel plate twist transition element comprising an input port comprising an input waveguide portion, the input waveguide portion configured to orient an E-field of an electromagnetic wave along a first plane, and an output port comprising a multi-mode parallel plate portion, the multi-mode parallel plate portion configured to orient an E-field of an electromagnetic wave along a second plane, wherein an angle of orientation of the second plane is different from an angle of orientation of the first plane.

Abstract: A cavity-backed slot antenna is disclosed that includes a stripline. The stripline includes a conductive strip between two ground planes separated by a dielectric. The conductive strip feeds the cavity-backed slot antenna. The stripline also includes a first segment and a second segment. The first segment has a first characteristic impedance. The second segment is proximate the cavity-backed antenna and has a second characteristic impedance different than the first characteristic impedance. The second characteristic impedance provides impedance for matching a load impedance of the cavity-backed slot antenna.

Abstract: A wireless communication module including a substrate, a first antenna, a second antenna and a resonator group is provided. The first antenna and the second antenna are disposed on the substrate. The resonator group is disposed between the first antenna and the second antenna and separated from the first antenna and the second antenna. The resonator group includes a first resonator and a second resonator. The first resonator includes a first resonant cavity, a first extension slot, a first conductive portion and a second conductive portion. The first extension slot extends towards a lateral surface of the substrate from the first resonant cavity. The first conductive portion and the second conductive portion are located within the first resonant cavity and separated from each other. The second resonator includes a second resonant cavity and a second extension slot extending towards the lateral surface from the second resonant cavity.

Abstract: Optimizations are provided in the design and fabrication of a parabolic antenna reflector. In particular, a parabolic antenna reflector comprises an inner reflective face being formed in a parabolic shape and a first outer circumferential portion. The parabolic antenna also includes an outer face being formed in a different parabolic shape and a second circumferential portion. The first outer circumferential portion is coupled to the second outer circumferential portion to form an inner body between the inner reflective face and the outer face. This inner body includes a monopulse comparator waveguide. As a result, the monopulse comparator waveguide is embedded between the inner reflective face and the outer face. In some instances, this waveguide includes one or more bends. Additionally, in some instances, the parabolic antenna reflector is fabricated using additive manufacturing techniques such that the parabolic antenna reflector is a single printed unit.

Abstract: Antennas such as flat panel, leaky wave antennas with directional coupler feeds and waveguides are disclosed. In one example, an antenna includes a surface having antenna elements, a guided wave transmission line, and a coupling surface. The guided wave transmission line provides a guided feed wave. The coupling surface is between and separates the guided wave transmission line and the surface having antenna elements. The coupling surface controls coupling of the guided feed wave to the antenna elements. The coupling surface can also spatially filter the guided feed wave to provide a more uniform power density for the antenna elements. The guided feed wave can be a high power density electromagnetic wave or a density radially decaying electromagnetic wave.

Abstract: A method of producing a horn antenna array includes: a step of providing a first die and a second die; a step of assembling the first die and the second die, filling an internal space surrounded by the first die and the second die with a fluid material, and solidifying the fluid material; and a step of, after the material has solidified, separating the first die and the second die. In a portion corresponding to each horn antenna element, the first die has a pair of protrusions and a groove between the pair of protrusions, and the second die has a protrusion. In a state where the first die and the second die are assembled, a gap exists between a tip end of each protrusion of the second die and a bottom face of each groove.

Abstract: A cover for a radar sensor for motor vehicles, which has a wall provided with a three-dimensional relief structure, in which the wall including the relief structure is made of deep-drawn glass.

Abstract: A modular feed system for axis symmetric reflector antennas includes an upper hat segment, a mid-section segment and a lower base segment, the upper hat and lower base segments being securable to respective opposing ends of the mid-section segment; wherein the length of the mid-section segment is selected in order to accommodate application of a particularly sized reflector antenna; and a mechanical mating mechanism including base slots for feed spring entry, corresponding carriage springs on the feed, and corresponding recessed spring capture locations; and wherein the carriage springs are sized and configured to pass through the corresponding base slots for feed spring entry as part of the initial mating of the feed to the base segment, and selective rotation thereof moves the corresponding carriage springs into corresponding recessed spring capture locations and causing a mechanically audible sound for indicating that the feed has locked into position.

Abstract: An electromagnetic wave radiator may include: a first metal layer; a plurality of metal side walls vertically protruding along an edge of the first metal layer; and a second metal layer suspended over the first metal layer. The second metal layer includes a plurality of ports radially extending from edges of the second metal layer and a plurality of slots penetrating the second metal layer in a radial direction.

Abstract: A radar system includes a plurality of radiating elements configured to radiate electromagnetic energy and a plurality of feed waveguides defining a common plane and configured to guide electromagnetic energy to the plurality of radiating elements. The radar system also includes a plurality of waveguides arranged as a dividing network configured to split the electromagnetic energy from the source among the plurality of feed waveguides, such that each feed waveguide receives a respective portion of the electromagnetic energy. Additionally, the dividing network is configured to adjust a phase of the electromagnetic energy received by each waveguide. The splitting and adjusting of the dividing network may be based on differences in height and/or width between the waveguides of the dividing network and the feed waveguides. At least a portion of the dividing network is located in a plane other than the common plane of the feed waveguides.

Abstract: A method of producing a horn antenna array includes: a step of providing a first die and a second die; a step of assembling the first die and the second die, filling an internal space surrounded by the first die and the second die with a fluid material, and solidifying the fluid material; and a step of, after the material has solidified, separating the first die and the second die. In a portion corresponding to each horn antenna element, the first die has a pair of protrusions and a groove between the pair of protrusions, and the second die has a protrusion. In a state where the first die and the second die are assembled, a gap exists between a tip end of each protrusion of the second die and a bottom face of each groove.

Abstract: An antenna includes a plurality of waveguide antenna elements arranged in a first array configured to operate with a first polarization. The antenna also includes a plurality of waveguide output ports arranged in a second array configured to operate with a second polarization. The second polarization is different from the first polarization. The antenna further includes a polarization-rotating layer with channels defined therein. The polarization-rotating layer is disposed between the waveguide antenna elements and the waveguide output ports. The channels are oriented at a first angle with respect to the waveguide antenna elements and at a second angle with respect to the waveguide output ports. The channels are configured to receive input electromagnetic waves having the first polarization and transmit output electromagnetic waves having a first intermediate polarization.

Abstract: A wireless communication device including an antenna device is provided. The wireless a communication device includes a housing having a conductive structure, a millimeter wave (mmWave) antenna having a plurality of antenna elements, the mmWave antenna being disposed within the housing, and a leaky-wave radiator having at least one opening formed in the conductive structure of the housing. An electromagnetic field generated by the mmWave antenna may be radiated outside of the housing of the wireless communication device through the leaky-wave radiator. The wireless communication device and/or an electronic device may be diversified according to embodiments.

Abstract: A substrate integrated waveguide, SIW, antenna comprises a modified design of prior art SIW antennas that comprises an addition of electrically conducting means, e.g. vias, also along the substrate extending from the antenna aperture. By doing so, the SIW antenna of the present disclosure enables a reduction of mutual coupling between neighboring SIW antennas when arranged adjacent each other, e.g. in an array. Moreover, a reduction of back radiation in the SIW antenna can also be observed.

Abstract: An apparatus includes a waveguide of an antenna block configured to propagate electromagnetic energy along a propagation direction. The antenna block includes a port located on a bottom surface of the antenna block and an antenna array located on a top surface of the antenna block. The antenna block further includes a set of waveguides in the antenna block configured to couple the antenna array to the port. Additionally, the antenna block includes at least one surface wave radiator, where the surface wave radiator is located on the top surface of the antenna block.

Abstract: An antenna device includes an antenna coil, a magnetic sheet, and a metallic member. The antenna coil is formed on a flexible base. The antenna coil is wound into a loop or a spiral in which a winding central portion is a coil opening portion. The magnetic sheet is disposed at a back surface of the flexible base. A square opening is formed in the metallic member. The antenna coil is exposed from the opening of the metallic member. A first side of the antenna coil is hidden by the metallic member and part of the coil opening portion and a second side are exposed from the opening, so that a magnetic flux links with the second side.