Nec Corporation

Nec Engineering, Ltd.

Norihisa Shiroyama

Takahiro Miyamoto

Sumio Ueda

Kiyotake Sasaki

A tunable bandpass filter (A) includes a waveguide (); a plurality of resonators () housed in the waveguide () and arranged in the lengthwise direction of the waveguide (); a coupling member () disposed between two adjacent resonators (); a ridge member () extending in the lengthwise direction of the waveguide () and connected to one end of the coupling member (); and a dielectric plate () extending in the lengthwise direction of the waveguide (), disposed adjacent to the plurality of resonators () in a direction orthogonal to the lengthwise direction of the waveguide (), and movable in the direction orthogonal to the lengthwise direction of the waveguide ().

Tunable bandpass filter and method of forming the same

A coaxial waveguide transducer includes: a waveguide having a substantially L shape formed of a first waveguide part and a second waveguide part arranged substantially orthogonal to each other; a stepwise step bend part formed in an outer corner part of an L-shaped bent part of the waveguide; a first conductor and a second conductor arranged in respective inner side walls of the waveguide in such a way that they are extended in a direction in which a central conductor of the coaxial line is extended and are positioned on a plane the same as that where the central conductor is provided; and a third conductor having one end connected to the central conductor and another end connected to one of the first conductor and the second conductor, the third conductor being arranged obliquely with respect to the direction in which the central conductor is extended.

Coaxial to waveguide transducer including an L shape waveguide having an obliquely arranged conductor and method of forming the same

Conventional coaxial wiring devices present a problem in that the management of the manufacturing process therefor is difficult. A coaxial wiring device according to the present invention includes a first member, a second member, and a conductor plate. The first member () and the second member () include, when a line that connects a first port and a second port is denoted by a reference line, a first groove () that has a central point on the reference line and extends in a direction that intersects with the reference line; a second groove () that connects one end (FN) of the first groove () and the first port; a third groove () that connects the other end (FN) of the first groove () and the first port and has a shape that is line symmetrical to the second groove () with respect to the reference line; a fourth groove () that connects one end (FN) of the first groove () and the second port; and a fifth groove () that connects the other end (FN) of the first groove () and the second port and has a shape that is line symmetrical to the fourth groove () with respect to the reference line.

Coaxial wiring device and transmission/reception integrated splitter

[Problem] To provide a cross coupled band-pass filter that reduces a loss of a signal due to a dielectric loss and enables a resonance frequency to be easily changed. [Solution] A cross coupled band-pass filter of the present invention includes an input waveguide, an output waveguide, and three or more stages of resonators that connect the waveguides together, in which the three or more stages of resonators is formed using a filter element, one or multiple pairs of resonators of the three or more stages of resonators adjoin via a shared tube wall and include an opening in the shared tube wall, an antenna that connects the one or multiple pairs of resonators together in the opening, and one or more stages of unconnected resonators between the one or multiple pairs of resonators in a waveguide path of electromagnetic waves.

Cross coupled band-pass filter

A coaxial waveguide conversion device according to the present invention includes a first member; a second member provided so as to be opposed to the first member; and a conductor plate provided so as to be sandwiched between the first member and the second member. A waveguide is formed in the first member and the second member to a depth that penetrates the first member and does not penetrate the second member. The conductor plate includes an opening having a shape corresponding to a shape of an aperture plane of the waveguide; a conductor surface portion provided around the opening; an antenna portion; a waveguide short-circuit portion connecting the antenna portion with the conductor surface portion; a coaxial wiring portion provided at one end of the antenna portion; and a coaxial line short-circuit portion connecting another end of the antenna portion with the conductor surface portion.

Waveguide coaxial conversion device and transmission/reception integrated splitter

The first member and the second member include, when a line that connects a first port and a second port is denoted by a reference line, a first groove that has a central point on the reference line and extends in a direction that intersects with the reference line; a second groove that connects one end of the first groove and the first port; a third groove that connects the other end of the first groove and the first port and has a shape that is line symmetrical to the second groove with respect to the reference line; a fourth groove that connects the other end (FN) of the first groove and the second port; and a fifth groove that connects one end (FN) of the first groove and the second port and has a shape that is line symmetrical to the fourth groove with respect to the reference line.

The present invention comprises: a conductive chassis having a cavity resonator; a conductive cover to cover the cavity resonator; a resonant element arranged in the cavity resonator, one end of the resonant element being connected with the chassis and the other end being open end; and a movable conductor arranged in a space between the open end of the resonant element and the conductive cover. As a result, a tunable band-pass filter which is inexpensive and of a simple structure and which can change a resonance frequency of a cavity resonator and the coupling amount between cavity resonators easily is realized.

Growing community of inventors

Tokyo, Japan

Norihisa Shiroyama