Aspects of the subject disclosure may include, a system that facilitates receiving a first electromagnetic wave propagating along a transmission medium, detecting, according to the first electromagnetic wave, an obstruction on a first portion of an outer surface of the transmission medium, responsive to the detecting the obstruction, configuring a material to have similar properties to the obstruction, the material being positioned along a second portion of the outer surface of the transmission medium, and generating a second electromagnetic wave that propagates along the transmission medium without relying on an electrical return path to facilitate propagation of the second electromagnetic wave along the transmission medium, the material facilitating propagation of the second electromagnetic wave from the second portion of the outer surface of the transmission medium to the first portion of the transmission medium affected by the obstruction. Other embodiments are disclosed.

Aspects of the subject disclosure may include, a system that facilitates receiving a first electromagnetic wave propagating along a transmission medium, detecting, according to the first electromagnetic wave, an obstruction on a first portion of an outer surface of the transmission medium, responsive to the detecting the obstruction, configuring a material to have similar properties to the obstruction, the material being positioned along a second portion of the outer surface of the transmission medium, and generating a second electromagnetic wave that propagates along the transmission medium without relying on an electrical return path to facilitate propagation of the second electromagnetic wave along the transmission medium, the material facilitating propagation of the second electromagnetic wave from the second portion of the outer surface of the transmission medium to the first portion of the transmission medium affected by the obstruction. Other embodiments are disclosed.

A radar level gauge system, comprising a transceiver; an antenna; a feed-through connecting the transceiver and the antenna; and processing circuitry coupled to the transceiver. The feed-through comprises a first waveguide section comprising a dielectric plug sealingly arranged in a cylindrical first hollow conductor section having a diameter selected for single mode propagation; a second waveguide section arranged between the transceiver and the first waveguide section and comprising a cylindrical second hollow conductor section having a second diameter selected for single mode propagation, a third waveguide section arranged between the antenna and the first waveguide section comprising a cylindrical third hollow conductor section having a third diameter selected for single mode propagation; a first impedance matching waveguide section arranged between the first waveguide section and the second waveguide section, and a second impedance matching waveguide section arranged between the first waveguide section and the third waveguide section.

The present invention relates to a cavity filter including: an RF signal connecting portion spaced apart, by a predetermined distance, from an outer member having an electrode pad provided on a surface thereof; and a terminal portion configured to electrically connect the electrode pad of the outer member and the RF signal connecting portion so as to absorb assembly tolerance existing at the predetermined distance and to prevent disconnection of the electric flow between the electrode pad and the RF signal connecting portion, wherein a part of the terminal portion, positioned between the electrode pad and the RF signal connecting portion, is elastically deformed to absorb assembly tolerance existing in a terminal insertion port. Therefore, the cavity filter can efficiently absorb assembly tolerance which occurs through assembly design, and prevent disconnection of an electric flow, thereby preventing degradation in performance of an antenna device.

Embodiments of the invention provide a hollow cable for conveying radiofrequency and/or microwave frequency energy to an electrosurgical instrument that can fit within, e.g. slide relative to, the hollow cable. The hollow cable provides a bipolar electrical connection to the electrosurgical instrument that is maintained when the electrosurgical instrument is rotated relative to the hollow cable. The cable may comprise a hollow coaxial transmission line having a rotatable component mounted at its distal end. The rotatable component comprises a longitudinal passageway continuous with the hollow coaxial transmission line. The rotatable component is rotatable relative to the transmission line and comprises a first and second conductive portions that are respectively electrically connected to first and second terminals on the coaxial transmission line and which are configured to maintain an electrical connection with their respective terminal when rotated relative to the coaxial transmission line.

Embodiments of the invention provide a hollow cable for conveying radiofrequency and/or microwave frequency energy to an electrosurgical instrument that can fit within, e.g. slide relative to, the hollow cable. The hollow cable provides a bipolar electrical connection to the electrosurgical instrument that is maintained when the electrosurgical instrument is rotated relative to the hollow cable. The cable may comprise a hollow coaxial transmission line having a rotatable component mounted at its distal end. The rotatable component comprises a longitudinal passageway continuous with the hollow coaxial transmission line. The rotatable component is rotatable relative to the transmission line and comprises a first and second conductive portions that are respectively electrically connected to first and second terminals on the coaxial transmission line and which are configured to maintain an electrical connection with their respective terminal when rotated relative to the coaxial transmission line.

A radio-frequency assembly is described which can be used in communication satellites, for example. The radio-frequency assembly contains a signal source in the form of a semiconductor amplifier output, an impedance matching filter, and a radio-frequency waveguide. The impedance matching filter is connected to the semiconductor amplifier output on the input side and to the radio-frequency waveguide on the output side. The impedance matching filter has a different impedance value on the input side from that on the output side and is matched to the semiconductor amplifier output on the input side and matched to the radio-frequency waveguide on the output side. Consequently, a separate matching circuit between semiconductor amplifier output and radio-frequency waveguide is no longer necessary.

A plasma processing apparatus includes a chamber providing a substrate processing space, a conductive upper shower head providing a plurality of gas holes and provided above the substrate processing space, a conductive lower shower plate providing through holes connected to the substrate processing space and provided under the upper shower head and above the substrate processing space, an electromagnetic wave introduction part formed of a dielectric material, a waveguide extending in the circumferential direction to surround the upper shower head and the electromagnetic wave introduction part and connected to the electromagnetic wave introduction part, and a coaxial line including a central conductor and an outer conductor and provided to supply electromagnetic waves to the waveguide. The coaxial line extends away from the central axis. The central conductor is connected to a wall surface that defines the waveguide at a position away from the central axis.

A plasma processing apparatus includes a chamber providing a substrate processing space, a conductive upper shower head providing a plurality of gas holes and provided above the substrate processing space, a conductive lower shower plate providing through holes connected to the substrate processing space and provided under the upper shower head and above the substrate processing space, an electromagnetic wave introduction part formed of a dielectric material, a waveguide extending in the circumferential direction to surround the upper shower head and the electromagnetic wave introduction part and connected to the electromagnetic wave introduction part, and a coaxial line including a central conductor and an outer conductor and provided to supply electromagnetic waves to the waveguide. The coaxial line extends away from the central axis. The central conductor is connected to a wall surface that defines the waveguide at a position away from the central axis.

An adapter for coupling a coaxial transmission line to a waveguide, wherein the center conductor of the coaxial line passes via a back short of the waveguide through an iris and that terminates to the inside wall of the waveguide.