A band-pass filter device includes a waveguide filter, a first circuit board section, a first antenna, a second circuit board section, and a second antenna. The waveguide filter includes a high-pass portion, a connection portion, and a low-pass portion. The first antenna is disposed on the first circuit board section. The second antenna is disposed on the second circuit board section. A wireless signal generated by the first antenna is transmitted through the high-pass portion, the connection portion, and the low-pass portion of the waveguide filter, and then is received by the second antenna.

A band-pass filter device includes a waveguide filter, a first circuit board section, a first antenna, a second circuit board section, and a second antenna. The waveguide filter includes a high-pass portion, a connection portion, and a low-pass portion. The first antenna is disposed on the first circuit board section. The second antenna is disposed on the second circuit board section. A wireless signal generated by the first antenna is transmitted through the high-pass portion, the connection portion, and the low-pass portion of the waveguide filter, and then is received by the second antenna.

A slot array antenna includes: a first conductive member having a first conductive surface and a plurality of slots arranged in a first direction; a second conductive member having a second conductive surface that opposes the first conductive surface; a waveguide member having a waveguide face that extends so as to oppose one of the first and second conductive surfaces; and an artificial magnetic conductor extending around the waveguide member. The waveguide member includes: a stem extending along a direction; first and second joint portions branching out from an end of the stem and extending into a region between two adjacent slots; a first branch extending in the first direction from an end of the first joint portion and coupling to some slots; and a second branch extending from an end of the second joint portion in an opposite direction of the first direction and coupling to other slots.

A slot array antenna includes: a first conductive member having a first conductive surface and a plurality of slots arranged in a first direction; a second conductive member having a second conductive surface that opposes the first conductive surface; a waveguide member having a waveguide face that extends so as to oppose one of the first and second conductive surfaces; and an artificial magnetic conductor extending around the waveguide member. The waveguide member includes: a stem extending along a direction; first and second joint portions branching out from an end of the stem and extending into a region between two adjacent slots; a first branch extending in the first direction from an end of the first joint portion and coupling to some slots; and a second branch extending from an end of the second joint portion in an opposite direction of the first direction and coupling to other slots.

A corrugated passive radiofrequency device, in particular a waveguide or horn-type antenna. The device includes a core including at least one inner face delimiting a channel for filtering and guiding waves. The at least one internal face of the channel includes a plurality of cavities or grooves. Each cavity or groove is formed by substantially parallel adjacent walls to filter the waves passing through the channel. The adjacent walls are inclined with respect to the central axis of the channel.

A non-contact frequency automatic tuning filter with an antileakage chamber includes a first casing with a first cavity formed at a first opening of the first casing, a moving part, and a second cavity. The second cavity has a second casing, a chamber formed in the second casing, and second and third openings penetrating through the second casing. The moving part is plugged from the third opening into the first cavity or from the third opening into a space between the third opening and the first cavity. The second opening proximate to the moving part constitutes a part of the chamber. The second casing has a spacing portion proximate to the moving part for separating the moving part and chamber. The first and second casings are not in contact with the moving part. The invention can prevent leakage of electromagnetic waves and unstable frequency shifting.

A band-pass filter device includes a waveguide filter, a first circuit board section, a first antenna, a second circuit board section, and a second antenna. The waveguide filter includes a high-pass portion, a connection portion, and a low-pass portion. The first antenna is disposed on the first circuit board section. The second antenna is disposed on the second circuit board section. A wireless signal generated by the first antenna is transmitted through the high-pass portion, the connection portion, and the low-pass portion of the waveguide filter, and then is received by the second antenna.

A non-contact frequency automatic tuning filter with an antileakage chamber includes a first casing with a first cavity formed at a first opening of the first casing, a moving part, and a second cavity. The second cavity has a second casing, a chamber formed in the second casing, and second and third openings penetrating through the second casing. The moving part is plugged from the third opening into the first cavity or from the third opening into a space between the third opening and the first cavity. The second opening proximate to the moving part constitutes a part of the chamber. The second casing has a spacing portion proximate to the moving part for separating the moving part and chamber. The first and second casings are not in contact with the moving part. The invention can prevent leakage of electromagnetic waves and unstable frequency shifting.

A transmission line device includes: a plurality of electrically conductive members stacked with interspaces therebetween, the plurality of electrically conductive members including three or more electrically conductive members; and a plurality of artificial magnetic conductors each located between two adjacent electrically conductive members among the plurality of electrically conductive members. Among the plurality of electrically conductive members, at least one electrically conductive member located between two endmost electrically conductive members is shaped as a plate having at least one slit. At least a portion of the plurality of artificial magnetic conductors is located around the at least one slit to suppress leakage of an electromagnetic wave propagating along the at least one slit.

A transmission line device includes: a plurality of electrically conductive members stacked with interspaces therebetween, the plurality of electrically conductive members including three or more electrically conductive members; and a plurality of artificial magnetic conductors each located between two adjacent electrically conductive members among the plurality of electrically conductive members. Among the plurality of electrically conductive members, at least one electrically conductive member located between two endmost electrically conductive members is shaped as a plate having at least one slit. At least a portion of the plurality of artificial magnetic conductors is located around the at least one slit to suppress leakage of an electromagnetic wave propagating along the at least one slit.