Nec Corporation

Daisuke Iwanaka

Tomoya Kaneko

Akio Kuramoto

Junichi Fukuda

A frequency variable filter includes variable resonators aligned in a predetermined direction, a coupling part configured to couple the adjacent variable resonators, and a coupling variable dielectric. The variable resonator includes a resonator and a frequency variable dielectric disposed in a movable state relative to the resonator, and is configured to be able to change a resonance frequency according to a position of the frequency variable dielectric with respect to the resonator. This applies to aligned variable resonators other than this variable resonator. The coupling variable dielectric is disposed in a movable state with respect to the coupling part and configured to adjust a coupling coefficient according to an amount of insertion into the coupling part. The coupling variable dielectric is disposed so that a movable surface of the coupling variable dielectric is on the same plane as a movable surface of the frequency variable dielectric.

Frequency variable filter and coupling method

A tunable band-pass filter () according to the present disclosure includes: a waveguide (); a plurality of resonators () configured to be accommodated in the waveguide () and aligned in a longitudinal direction of the waveguide (); a dielectric plate () configured to extend in the longitudinal direction of the waveguide () so to be arranged adjacent to the plurality of resonators (); and a metal pattern () for coupling adjustment formed on the dielectric plate () at a position corresponding to an interstage of the resonators (), in which a distance between the dielectric plate () and the resonators () is variable.

Tunable band-pass filter and control method therefor

This tunable bandpass filter is provided with: a conductive member having a plurality of resonance rods protruding so as to be aligned in a single plane; a dielectric plate disposed parallel to the single plane; a drive part which is attached to the dielectric plate and drives the dielectric plate in directions parallel and perpendicular to the single plane; and a waveguide containing at least the resonance rods and the dielectric plate.

Tunable bandpass filter

A coaxial line having a small transmission loss and a variable operating frequency can be provided. The coaxial line includes one or a plurality of unit structures repeatedly arranged in a direction of a central axis. The unit structure includes an inner conductor, two dielectrics arranged in the central-axial direction so as to sandwich the inner conductor therebetween, an outer conductor configured to envelop the inner conductor and the dielectrics, and an inductor connected between the inner conductor and the outer conductor.

Coaxial line, resonator, and filter

A first waveguide guides a first radio wave whose electric field is vibrated in a first direction along a second direction. A second waveguide guides the first radio wave along the second direction and is cascade connected to the first waveguide. An input and output end multiplexes the first radio waves from the first and second waveguides and outputs the multiplexed radio wave, and outputs the first radio wave branched off from a radio wave from outside to the first and second waveguides. A first waveguide shift portion is shifted from the first waveguide in the first direction. A second waveguide shift portion is shifted from the second waveguide in the first direction. The vibration directions of electric fields of radio waves passing through the end parts of the first and second waveguide shift portions are rotated by 90&#xb0; about a third direction.

Electric field direction conversion structure and planar antenna

An antenna includes an antenna layer, a coupling layer, and a feeder circuit layer. The antenna layer includes antennas elements. First and second antenna elements are arranged in such a manner that the centers thereof are aligned in a first direction. A third antenna element is arranged in such a manner that the third antenna element is separated from the first antenna element in a second direction and centers of the antenna elements are not aligned in the second direction. A waveguide is formed in the coupling layer.

Antenna

A radiowave absorber of the present invention includes: an upper plate that includes a dielectric material containing conductive particles; a lower plate that is arranged parallel to the upper plate, and includes a dielectric material that contains conductive particles; and a plate-shaped support portion that is arranged between the upper plate and the lower plate, and supports the upper plate and the lower plate.

Growing community of inventors

Tokyo, Japan

Daisuke Iwanaka