In accordance with one or more embodiments, a dielectric coupler includes a neck portion configured to receive a first electromagnetic wave from a hollow waveguide. A flared portion is configured to generate, responsive to the first electromagnetic wave, a second electromagnetic wave along a surface of a transmission medium, wherein the flared portion at least partially surrounds the transmission medium, wherein the second electromagnetic wave propagates along the surface of the transmission medium without requiring an electrical return path. A tapered portion is configured to interface the neck portion to the flared portion.

Multi-band radio frequency communication is performed using an integrated multi-band bandpass filter implemented based on ring resonators, such as concentric dielectric ring resonators. By constructing the multi-band bandpass filter using concentric ring configurations, the print circuit board (PCB) real estate requirement of multiple filters operating at multiple frequency bands is significantly reduced. Various configurations of the multi-band bandpass filter based on the concentric ring resonators provide flexibility in the layout design and manufacturing of multi-band radios for mobile devices, such as compact smartphones. These configurations of the concentric ring resonators can include but are not limited: a slot-coupling configuration, a direct-coupling configuration, and an embedded direct-coupling configuration.

Disclosed is a printed circuit board (PCB) structure, in which an electromagnetic signal transmitting antenna and/or an electromagnetic signal receiving antenna, and an electromagnetic signal transferring tunnel (EM-tunnel) are embedded, the PCB structure including a PCB, an EM-tunnel that includes a dielectric core and a metal clad that surrounds the dielectric core and that is embedded in the PCB to be parallel to the PCB, and at least one transmitting antenna and/or at least one receiving antenna that are embedded in the PCB, wherein the transmitting antenna and/or the receiving antenna are arranged at an input port and an output port of the EM-tunnel embedded in the PCB to transmit and receive electromagnetic signals to and from the interior of the EM-tunnel.

A signal transmission system including: a first connector apparatus, and a second connector apparatus that is coupled with the first connector apparatus. The first connector apparatus and the second connector apparatus are coupled together to form an electromagnetic field coupling unit, and a transmission object signal is converted into a radio signal, which is then transmitted through the electromagnetic field coupling unit, between the first connector apparatus and the second connector apparatus.

Electromagnetic (EM) mode transition or transducer structures and related devices, techniques, and methods are described. An exemplary EM mode transition or transducer structure can comprise a waveguide cavity section configured to transmit a transverse electric mode 20 (TE.sub.20) mode of the EM waves. An exemplary EM mode transition can further comprise a fundamental mode rejection section configured to suppress or reflect a transverse electric mode 10 (TE.sub.10 mode) and a transverse electric mode 30 (TE.sub.30) mode of the EM waves.

A waveguide microstrip line converter includes: a waveguide; a dielectric substrate; a ground conductor provided with a slot; a line conductor; and a conductor located at a distance from the line conductor and adjacent to the line conductor. The line conductor includes a microstrip line, a conversion unit, a first impedance transforming unit, a second impedance transforming unit, and a third impedance transforming unit, the microstrip line having a first line width, the conversion unit being located immediately above the slot and having a second line width larger than the first line width, the first impedance transforming unit, the second impedance transforming unit, and the third impedance transforming unit extending in a first direction from the conversion unit and having a role in impedance matching between the microstrip line and the conversion unit. The conductor is adjacent to at least part of the conversion unit of the line conductor.

Radio frequency (RF) probes are shown and disclosed. In some embodiments, the RF probe includes a dielectric waveguide having opposed first and second longitudinal end portions and a planar conducting ground member being received in the first end portion of the dielectric waveguide. The conducting ground member includes an end portion with at least a first prong. The probe assembly additionally includes a conducting transition member received in the first end portion of the dielectric waveguide and spaced from the planar conducting ground member. The conducting transition member includes an end portion that includes a second prong spaced from the first prong.

A dielectric waveguide port coupling structure comprising: a surface-metalized dielectric block having a first surface and a second surface that is opposite to the first surface; a blind groove opened in the first surface of the dielectric block; wherein the blind groove comprises a main portion and an extension portion each extending from the main portion toward a corresponding frequency blind hole that is located nearby and opened in the first surface of the dielectric block, the blind groove having its walls metalized; and a coupling through-hole penetrating from a bottom wall of the blind groove to the second surface of the dielectric block, and used for connecting with an input or output device to input or output a signal, wherein the coupling through-hole is metalized. A transmission line is on the bottom wall of the blind groove and extends from the coupling through-hole along a corresponding extension portion.

Radio frequency (RF) probes are shown and disclosed. In some embodiments, the RF probe includes a dielectric waveguide having opposed first and second longitudinal end portions and a planar conducting ground member being received in the first end portion of the dielectric waveguide. The conducting ground member includes an end portion with at least a first prong. The probe assembly additionally includes a conducting transition member received in the first end portion of the dielectric waveguide and spaced from the planar conducting ground member. The conducting transition member includes an end portion that includes a second prong spaced from the first prong.

A high-frequency transmission element is provided. The high-frequency transmission element includes a connecting wire structure and an impedance matching plate structure. The connecting wire structure includes a connecting wire and a connecting pad. The connecting pad is located at an end of the connecting wire. The impedance matching plate structure includes an impedance matching plate body, an opening, and an impedance matching portion. The connecting pad is located in a projection range of the opening in a direction of orthographic projection of the impedance matching plate structure. The impedance matching portion is located in a periphery of the opening and extends in the direction from the connecting wire towards the connecting pad.