Aspects of the subject disclosure may include, a system that facilitates generating one or more tuning signals supplied to a material positioned along a portion of an outer surface of a transmission medium, the material facilitating generation of electromagnetic waves having a desired wave mode, and generating an electromagnetic wave with the desired wave mode, the electromagnetic wave propagating along the transmission medium without relying on an electrical return path to facilitate propagation of the electromagnetic wave along the transmission medium. Other embodiments are disclosed.

Aspects of the subject disclosure may include, a system that facilitates generating one or more tuning signals supplied to a material positioned along a portion of an outer surface of a transmission medium, the material facilitating generation of electromagnetic waves having a desired wave mode, and generating an electromagnetic wave with the desired wave mode, the electromagnetic wave propagating along the transmission medium without relying on an electrical return path to facilitate propagation of the electromagnetic wave along the transmission medium. Other embodiments are disclosed.

A printed board including an external interface, a frame ground trace electrically connected to the external interface, a circuit member spaced from the frame ground trace, and a resonance trace disposed between the frame ground trace and the circuit member with a gap present between the resonance trace and the frame ground trace. The resonance trace is connected to the circuit member at at least two positions. The resonance trace and the circuit member together form a loop member configured in the form of a closed circuit of the resonance trace and the circuit member.

Aspects of the subject disclosure may include, a system that facilitates generating one or more tuning signals supplied to a material positioned along a portion of an inner surface of a structure of the waveguide system, the material facilitating generation of electromagnetic waves having a desired wave mode, and generating an electromagnetic wave with the desired wave mode, the electromagnetic wave propagating along a transmission medium without relying on an electrical return path to facilitate propagation of the electromagnetic wave along the transmission medium. Other embodiments are disclosed.

Aspects of the subject disclosure may include, a system that facilitates generating one or more tuning signals supplied to a material positioned along a portion of an inner surface of a structure of the waveguide system, the material facilitating generation of electromagnetic waves having a desired wave mode, and generating an electromagnetic wave with the desired wave mode, the electromagnetic wave propagating along a transmission medium without relying on an electrical return path to facilitate propagation of the electromagnetic wave along the transmission medium. Other embodiments are disclosed.

A transmission device is enabled to satisfactorily detecting whether or not a reception device is in the operating state even in a case where an element that adjusts signal quality is interposed in a data line. A cable is connected between the transmission device and the reception device. The element that adjusts signal quality is interposed in the data line. A detection unit detects that the reception device is in the operating state. An information supply unit supplies detection information to the transmission device through a predetermined line.

A transmission device is enabled to satisfactorily detecting whether or not a reception device is in the operating state even in a case where an element that adjusts signal quality is interposed in a data line. A cable is connected between the transmission device and the reception device. The element that adjusts signal quality is interposed in the data line. A detection unit detects that the reception device is in the operating state. An information supply unit supplies detection information to the transmission device through a predetermined line.

A waveguide-coupling device (14) for a hydraulic cylinder (10) has an outer conductor element (22) to which a microwave signal can be supplied, an inner conductor element (24) for coupling a waveguide mode into a liquid-filled inner chamber (16) of the hydraulic cylinder (10) and a dielectric insulating element (22) arranged between the inner conductor element (24) and the outer conductor element (20), wherein the inner conductor element (24) and the dielectric insulating element (22) as well as the dielectric insulating element (22) and the outer conducting element (20) are each connected to each other in a liquid-tight manner.

A waveguide-coupling device (14) for a hydraulic cylinder (10) has an outer conductor element (22) to which a microwave signal can be supplied, an inner conductor element (24) for coupling a waveguide mode into a liquid-filled inner chamber (16) of the hydraulic cylinder (10) and a dielectric insulating element (22) arranged between the inner conductor element (24) and the outer conductor element (20), wherein the inner conductor element (24) and the dielectric insulating element (22) as well as the dielectric insulating element (22) and the outer conducting element (20) are each connected to each other in a liquid-tight manner.

The present invention solves the problem that propagation of electromagnetic noise in a predetermined frequency band cannot be suppressed when an existing EBG structure is applied in a multilayer substrate. The structure of the present invention is provided with: a first power plane; a first GND plane faces the first power plane; a second GND plane faces the first power plane or the first GND plane; a first planar conductor facing the first GND plane and/or the second GND plane; a first conductor via for connecting the first planar conductor and the first power plane, the first conductor via being insulated from the first GND plane and the second GND plane; and a second conductor via for connecting the first GND plane and the second GND plane, the second conductor via being insulated from the first power plane and the first planar conductor.