A method for measuring and dynamically modulating characteristics of slow light in a photonic-crystal coupled-cavity waveguide is set forth. A photonic-crystal structure consists of a series of microcavity components formed by arranging silicon dielectric rods in triangular lattice structure in the substrate of organic polymer polystyrene with an electro-optical effect, a light waveguide structure being along the X direction, and regularly removing single silicon dielectric rods. The present disclosure has the beneficial effects that extremely high slow light effect and high-performance all-optical buffer are realized.

A microelectromechanical switch having improved isolation and insertion loss characteristics and reduced liability for stiction. The switch includes a signal line having an input port and an output port between first and second ground planes. The switch also includes a beam for controlling activation of the switch. In some embodiments, the switch further includes one or more defected ground structures formed in the first and second ground planes, and a corresponding secondary deflectable beam positioned over each defected ground structure. In some embodiments, the switch includes a metamaterial structure for generating a repulsive Casimir force.

An apparatus comprising: a sampler for over-sampling an input signal to produce a sampled input signal; a delta-sigma modulator for modulating the sampled input signal to produce a modulated signal; and a filter for filtering the modulated signal, the filter comprising: a conductive patch and a ground plane separated by a dielectric wherein the ground plane comprises a band-gap periodic structure.

A multi-layer waveguide device, a multi-layer waveguide arrangement, and a method for production thereof, wherein the multi-layer waveguide comprises at least three horizontally divided layers assembled into a multi-layer waveguide. The layers are at least a top layer, an intermediate layer, and a bottom layer, wherein each layer has through going holes extending through the entire layer. The holes are arranged with an offset to adjacent holes of adjoining layers creating a leak suppressing structure.

The present invention discloses a band-pass filtering structure and an antenna housing. The band-pass filtering structure includes a functional layer structure, where the functional layer structure includes two or more first dielectric layers and a second dielectric layer that is disposed between two first dielectric layers, a plurality of first conductive geometric structures displayed in a periodical arrangement are disposed on the first dielectric layer, a plurality of second conductive geometric structures displayed in a periodical arrangement are disposed on the second dielectric layer, the first conductive geometric structure includes two crossly-disposed conductive strips, and the second conductive geometric structure is a closed conductive geometric structure. The present invention resolves a technical problem that filtering performance of an existing band-pass filter is poor due to unreasonable structural design.

The embodiments herein relate to a first waveguide comprising a first flange (103a) surrounding an end opening (105a) of the first waveguide (101a). The first flange (103a) comprises at least two holes (110) which are periodically distributed around the end opening (105a). The first waveguide (101a) is arranged to be connected to a second waveguide (101b) by connecting the first flange (103a) to a second flange (103b) of the second waveguide (101b) such that the end opening (105a) of the first waveguide (101a) faces an end opening (105b) of the second waveguide (101b) and such that the holes (110) in the first flange (103a) are at least partly glide symmetrically positioned with respect to holes (110) which are periodically distributed around the end opening (105b) of the second flange (103b).

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.

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 transition arrangement including a first transmission line being a planar transmission line including a coupling section and being disposed on a dielectric substrate layer. The substrate layer has a periodic or quasi-periodic structure arranged in the substrate layer such as to be disposed along at least part of the first transmission line and to partly surround the coupling section. The transition arrangement includes a conducting layer on which the substrate layer is arranged and which is adapted to act as a ground plane, and the periodic or quasi-periodic structure is so arranged and at such a distance from the first transmission line and/or the coupling section that EM energy, RF power, can be coupled contactlessly between the first transmission line and the periodic or quasi-periodic structure, the transition between the first transmission line and the periodic or quasi-periodic structure being planar and contactless without any galvanic contact.

Embodiments of the invention include waveguide switch rotors, stators, waveguide switch housings and meander clamping mechanisms. In particular, the waveguide switch rotor design employs isolation posts surrounding waveguide ports disposed on the external face of the rotor to achieve an artificial magnetic boundary condition to achieve high isolation with improved gap from rotor to stator.