A connection structure includes a dielectric waveguide line and a rectangular waveguide. The dielectric waveguide line transmits a high-frequency signal in a transmission region surrounded by a first conductor layer, a second conductor layer, and two arrays of via hole groups. A coupling window is formed in the second conductor layer. The rectangular waveguide is disposed in such a way that an open end surface of the rectangular waveguide faces the coupling window, and that the transmission direction of the dielectric waveguide line becomes orthogonal to the transmission direction of the rectangular waveguide. A plurality of recesses are formed on a first substrate surface in the vicinity of the coupling window. A recessed conductor layer electrically connected to the first conductor layer is formed on inner wall surfaces of the plurality of recesses.

Methods and apparatuses for vertically transitioning signals between substrate integrated waveguides within a multilayered printed circuit board (PCB) are disclosed. A first substrate integrated waveguide (SIW) is provided in a first layer of the PCB, the first SIW having a first terminal portion. A second SIW is provided in a second layer of the PCB, the second SIW having a second terminal portion that overlaps with the first terminal portion, wherein a first ground plane separates the first SIW and the second SIW. A vertical transition comprising an aperture in the first ground plane that is disposed in an area defined by the overlap of the first terminal portion and the second terminal portion, such that a signal propagated in the first SIW transitions to the second SIW in a different layer through the aperture.

Provided is a structure configured to electrically connect multi-layer dielectric waveguides, each including a dielectric waveguide formed of conductor patterns and vias in a laminating direction of the multi-layer dielectric substrate, in which the vias for forming part of a waveguide wall of each of the dielectric waveguides are arranged in a staggered pattern in the multi-layer dielectric substrate side having choke structures formed so as to electrically connect the waveguides to each other.

It is provided a waveguide comprising a tubular, electrically conductive waveguide body, the waveguide having a rectangular cross-section. The waveguide further comprises an electrically conductive foil comprising at least one matching portion arranged within the waveguide body, extending along a propagation direction of the waveguide body, and at least one connection portion arranged outside of the waveguide body, for connecting the waveguide to a component, wherein the matching portion of the foil is tapered in a propagation direction of the waveguide and arranged to form a ridge protruding from a sidewall of the waveguide along part of the length of the waveguide, and wherein the connection portion extends outside of the waveguide, in a propagation direction of the waveguide and in the same plane as the matching portion. It is also provided a waveguide arrangement and a method for manufacturing such a waveguide arrangement.

The present disclosure provides a microwave transmission apparatus. The microwave transmission apparatus includes a waveguide, configured to transmit microwaves emitted from a microwave source to a load; and an impedance matching structure, disposed in the waveguide the waveguide. The waveguide includes a microstrip interdigital capacitor. The impedance before the input end of the impedance matching structure is matched with the impedance after the input end of the impedance matching structure by adjusting an equivalent capacitance formed by the microstrip interdigital capacitor and/or a position of the microstrip interdigital capacitor along the extending direction of the waveguide.

High speed waveguide-based data communication systems are disclosed. Such systems may include separable electrical connectors, forming signal propagation paths between electronic assemblies with one or more waveguides.

A radar assembly includes a rectangular-waveguide (RWG) and a printed-circuit-board. The rectangular-waveguide (RWG) propagates electromagnetic energy in a transverse electric mode (TE10) and in a first direction. The printed-circuit-board includes a plurality of conductor-layers oriented parallel to each other. The printed-circuit-board defines a substrate-integrated-waveguide (SIW) that propagates the electromagnetic energy in a transverse electric mode (TE10) and in a second direction perpendicular to the first direction, and defines a transition that propagates the electromagnetic energy between the rectangular-wave-guide and the substrate-integrated-waveguide. The transition includes apertures defined by at least three of the plurality of conductor-layers.

An electromagnetic wave transmission board includes a composite board and a plated metal layer. The composite board has a plurality of inner walls surroundingly defining an elongated channel in an interior of the composite board. The plated metal layer is formed on at least part of the inner walls so as to jointly form an inner channel structure in the channel. The inner channel structure surroundingly defines a predetermined space filled with air, and the inner channel structure has two entrances in air communication with the predetermined space. The predetermined space of the inner channel structure is configured to receive and output an electromagnetic wave signal through the two entrances, respectively, and the electromagnetic wave transmission board is configured to transmit the electromagnetic wave signal by using the air in the predetermined space of the inner channel structure as a conductive medium.

A filter device including a filter and waveguide tubes broadens a band in which return loss is small. A filter device (1) includes: a filter (11) including wide walls (13, 14) and narrow walls (16); and first and second waveguide tubes (21, 31). The filter 11 includes first and second columnar conductors (pins 18 and 19) each passing through an opening (13a1 or 13a2) which is provided in the wide wall (conductor layer 13) and having one end portion (181, 191) located inside the substrate (12). The first and second waveguide tubes (21, 31) are placed such that each of the first and second columnar conductors (pin 18, 19) passes through an opening (22a, 23a) and such that another end portion (182, 192) of each of the columnar conductors (pin 18, 19) is located inside the waveguide tube (21, 31).

Antenna assemblies for vehicles, such as RADAR sensor antenna assemblies. In some embodiments, the assembly may comprise an antenna block defining a waveguide groove and an adapter portion comprising a ridge. The ridge may taper or otherwise transition in height and/or width to facilitate a transition between two adjacent elements of the assembly, such as two adjacent waveguide structures comprising ridges having different cross-sectional dimensions.