Abstract: Provided is a switch device that can be used in a millimeter wave band and that can exhibit both low loss and high isolation characteristics. This switch device (1) includes: a post-wall waveguide (filter main body 1M) in which openings (AP1 to AP5) are formed in a broad wall (conductor layer 2); a cover (5) including a portion that blocks the openings (AP1 to AP5), the portion being made of an electrically conductive material; and a cover control mechanism (actuator 6) that switches between a first state in which the openings (AP1 to AP5) are blocked by the cover (5) and a second state in which the openings (AP1 to AP5) are open.

Abstract: A directional coupler 1 includes: a first waveguide 31 and a second waveguide 32 that are arranged in parallel with post arrays 23 and 24 therebetween; a coupling window 33 that is formed in the post arrays 23 and 24 and electromagnetically couples the first waveguide 31 and the second waveguide 32; and a projecting conductor 50 that projects, at a center in a width direction of the coupling window 33, from one conductive layer 13 of paired conductive layers 12 and 13 facing each other in the first waveguide 31 and the second waveguide 32, toward an inside of the coupling window 33, the projecting conductor 50 being spaced from the other conductive layer 12.

Abstract: Designing a filter with desired characteristics is made easy. A filter (1) includes a plurality of resonators (10 to 50) which are electromagnetically coupled. The plurality of resonators (10 to 50) each have a broad wall (11, 12, 21, 22, 31, 32, 41, 42, 51, 52) that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the plurality of resonators (10 to 50) are arranged such that D<R1+R2 is satisfied, where R1 and R2 represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.

Abstract: An object of the present invention is to prevent or reduce an error between a center frequency and a target center frequency in a coupled resonator band-pass filter which uses a post-wall waveguide. A band-pass filter (1) includes: a substrate (2) made of a dielectric substrate and sandwiched by a pair of conductor layers (3 and 4); and a post wall (11, 12) constituted by a plurality of conductor posts (11i, 12i) which pass through the substrate (2) and short-circuit the pair of conductor layers (3 and 4), the pair of conductor layers (3 and 4) and the post wall (11, 12) constituting a plurality of resonators (22 to 24) which are coupled, the pair of conductor layers serving as a pair of wide walls of the plurality of resonators, the post wall serving as a narrow wall of the plurality of resonator.

Abstract: Realized is a post-wall waveguide bandpass filter in which a bypass phenomenon is less likely to occur. In a post-wall waveguide bandpass filter (1) including an input part (10a) and an output part (10b), each of a first distance (distance X11), a second distance (not illustrated in FIG. 2), a third distance (distance X21), and a fourth distance (not illustrated in FIG. 2) is not more than 1.5 times a post interval (d).

Abstract: A diplexer (100) includes: first and second directional couplers (106A, 106B); and first and second filters (101A, 101B). The filters (101A, 101B) each include a plurality of resonators (110A to 150A, 110B to 150B) that are electromagnetically coupled. The resonators (110A to 150A, 110B to 150B) each have a broad wall that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the resonators (110A to 150A, 110B to 150B) are arranged such that D<R1+R2 is satisfied, where R1 and R2 represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.

Abstract: A filter device including a filter and waveguide tubes broadens a band in which return loss is small. A filter device (1) includes: a filter (11) including wide walls (13, 14) and narrow walls (16); and first and second waveguide tubes (21, 31). The filter 11 includes first and second columnar conductors (pins 18 and 19) each passing through an opening (13a1 or 13a2) which is provided in the wide wall (conductor layer 13) and having one end portion (181, 191) located inside the substrate (12). The first and second waveguide tubes (21, 31) are placed such that each of the first and second columnar conductors (pin 18, 19) passes through an opening (22a, 23a) and such that another end portion (182, 192) of each of the columnar conductors (pin 18, 19) is located inside the waveguide tube (21, 31).

Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (Wi) at a location (x=x1) at which the columnar conductor (34) is provided.

Abstract: Provided is a dielectric waveguide having a good reflection characteristic also in a band on a low frequency side of a center frequency of a given operation band. A dielectric waveguide (1) includes: a waveguide region (12) which is defined by a first wide wall (21), a second wide wall (22), a first narrow wall (23), a second narrow wall (24), and a short wall (25) and which is filled with a dielectric; and a mode conversion section (31) which includes a columnar conductor (34) extending from a surface of the waveguide region (12) toward an inside of the waveguide region (12). A width (W2) of the short wall (25) is configured to be greater than a waveguide width (W1) at a location (x=x1) at which the columnar conductor (34) is provided.

Abstract: A transmission line includes a post-wall waveguide which includes a dielectric substrate on which a pair of post-walls is formed and a first conductor layer and a second conductor layer opposed to each other with the dielectric substrate interposed therebetween and in which a region surrounded by the pair of post-walls, the first conductor layer, and the second conductor layer is a waveguide region, a waveguide tube having a hollow rectangular shape, being connected with the first conductor layer so as to cover an opening portion formed in a side wall, and in which an inside communicates with the waveguide region through an opening formed in the first conductor layer, and a wire member which is arranged such that through the opening, a first end is located inside the dielectric substrate and a second end is located in the waveguide tube.

Abstract: A filter device including a filter and waveguide tubes broadens a band in which return loss is small. A filter device (1) includes: a filter (11) including wide walls (13, 14) and narrow walls (16); and first and second waveguide tubes (21, 31). The filter 11 includes first and second columnar conductors (pins 18 and 19) each passing through an opening (13a1 or 13a2) which is provided in the wide wall (conductor layer 13) and having one end portion (181, 191) located inside the substrate (12). The first and second waveguide tubes (21, 31) are placed such that each of the first and second columnar conductors (pin 18, 19) passes through an opening (22a, 23a) and such that another end portion (182, 192) of each of the columnar conductors (pin 18, 19) is located inside the waveguide tube (21, 31).

Abstract: Designing a filter with desired characteristics is made easy. A filter (1) includes a plurality of resonators (10 to 50) which are electromagnetically coupled. The plurality of resonators (10 to 50) each have a broad wall (11, 12, 21, 22, 31, 32, 41, 42, 51, 52) that is in a shape of a circle or a regular polygon with six or more vertices, and two resonators, which are coupled together, of the plurality of resonators (10 to 50) are arranged such that D<R1+R2 is satisfied, where R1 and R2 represent radii of circumcircles of the broad walls of the two resonators and D represents a center-to-center distance between the two resonators.

Abstract: A transmission line includes a post-wall waveguide which includes a dielectric substrate on which a pair of post-walls is formed and a first conductor layer and a second conductor layer opposed to each other with the dielectric substrate interposed therebetween, and in which a region surrounded by the pair of post-walls, the first conductor layer, and the second conductor layer is a waveguide region, a waveguide tube having a hollow rectangular shape, being connected with the first conductor layer to cover an opening portion formed in a side wall, and in which an inside communicates with the waveguide region through an opening formed in the first conductor layer, a blind via formed in the dielectric substrate such that one end is disposed inside the opening, and a pole member including a post member connected to the one end of the blind via and a support member supporting the post member.

Abstract: An object of the present invention is to prevent or reduce an error between a center frequency and a target center frequency in a coupled resonator band-pass filter which uses a post-wall waveguide. A band-pass filter (1) includes: a substrate (2) made of a dielectric substrate and sandwiched by a pair of conductor layers (3 and 4); and a post wall (11, 12) constituted by a plurality of conductor posts (11i, 12i) which pass through the substrate (2) and short-circuit the pair of conductor layers (3 and 4), the pair of conductor layers (3 and 4) and the post wall (11, 12) constituting a plurality of resonators (22 to 24) which are coupled, the pair of conductor layers serving as a pair of wide walls of the plurality of resonators, the post wall serving as a narrow wall of the plurality of resonator.

Abstract: Realized is a post-wall waveguide bandpass filter in which a bypass phenomenon is less likely to occur. In a post-wall waveguide bandpass filter (1) including an input part (10a) and an output part (10b), each of a first distance (distance X11), a second distance (not illustrated in FIG. 2), a third distance (distance X21), and a fourth distance (not illustrated in FIG. 2) is not more than 1.5 times a post interval (d).

Abstract: Realized is a post-wall waveguide bandpass filter in which a bypass phenomenon is less likely to occur. In a post-wall waveguide bandpass filter (1) including an input part (10a) and an output part (10b), an external post wall (14a1, 14a2, 14b1, 14b2) is provided which is constituted by at least one conductor post that is provided outside a waveguide region (D1) and that short-circuits an outer periphery of an upper wide wall (12a) and an outer periphery of a lower wide wall (12b).

Abstract: Provided is a diplexer that is smaller and more lightweight than conventional diplexers. A diplexer includes a filter pair, first and second directional coupler sections, and first and second converter section pairs. These members are constituted by waveguides. The waveguides are post-wall waveguides that have a first wide wall, a second wide wall, and narrow walls. The first wide wall and the second wide wall are a pair of conductor plates provided on the opposite sides of a dielectric substrate. Each of the narrow walls is a post wall constituted by conductor posts passing through the dielectric substrate.

Abstract: A transmission line in which a waveguide tube and a planar transmission path are coupled to a post-wall waveguide broadens a band in which return loss is small. A transmission line (1) includes: a PPW (filter 11) including wide walls (13, 14) and narrow walls (16); and a waveguide tube (21). The PPW (filter 11) includes a columnar conductor (pin 18) that passes through an opening (13a) which is provided in the wide wall (conductor layer 13) and that has one end portion (181) located inside the substrate (12). The waveguide tube (21) is placed such that the columnar conductor (pin 18) passes through an opening (22a) and such that another end portion (182) of the columnar conductor (pin 18) is located inside the waveguide tube (21).

Abstract: A directional coupler 1 includes: a first waveguide 31 and a second waveguide 32 that are arranged in parallel with post arrays 23 and 24 therebetween; a coupling window 33 that is formed in the post arrays 23 and 24 and electromagnetically couples the first waveguide 31 and the second waveguide 32; and a projecting conductor 50 that projects, at a center in a width direction of the coupling window 33, from one conductive layer 13 of paired conductive layers 12 and 13 facing each other in the first waveguide 31 and the second waveguide 32, toward an inside of the coupling window 33, the projecting conductor 50 being spaced from the other conductive layer 12.

Abstract: A waveguide slot array antenna whose plan view size is smaller than that of a conventional waveguide slot array antenna is realized. A waveguide slot array antenna (1) includes: a split circuit board (11) to which a post-wall waveguide (113a) is provided, the post-wall waveguide (113a) being configured to cause an electromagnetic wave, inputted through an input opening (111a), to be split; and an antenna circuit board (12) to which a post-wall waveguide (123a) is provided, the post-wall waveguide (123a) being configured to guide, to a slot array (122a), the electromagnetic wave split in the post-wall waveguide (113a). The split circuit board (11) and the antenna circuit board (12) are joined to each other so that the post-wall waveguide (113a) and the post-wall waveguide (123a) at least overlap each other.