A directional coupler includes a main line through which a signal is transmitted, first and second sub-lines that are selectively coupled to the main line, and a common output port that outputs a detection signal generated by the signal transmitted through the main line, wherein a first degree of coupling between the main line and the first sub-line is different than a second degree of coupling between the main line and the second sub-line.

Isolation characteristics of a directional coupler are improved. A high-frequency module (1) includes a substrate (2) and a directional coupler (5) provided on the substrate (2). The directional coupler (5) includes a main line (51), a sub line (52), and an impedance adjustment portion (7). The sub line (52) is electromagnetically coupled to the main line (51). The impedance adjustment portion (7) is provided in the sub line (52), and adjusts impedance of the directional coupler (5). The impedance adjustment portion (7) is electrically connected to an inductor of the substrate (2).

Isolation characteristics of a directional coupler are improved. A high-frequency module (1) includes a substrate (2) and a directional coupler (5) provided on the substrate (2). The directional coupler (5) includes a main line (51), a sub line (52), and an impedance adjustment portion (7). The sub line (52) is electromagnetically coupled to the main line (51). The impedance adjustment portion (7) is provided in the sub line (52), and adjusts impedance of the directional coupler (5). The impedance adjustment portion (7) is electrically connected to an inductor of the substrate (2).

A branch-line coupler, adapted to radio frequency circuits, includes an input port, a first output port, a second output port, an isolated port, a first transmission line, a second transmission line, a first bent branch line, and a second bent branch line. The first transmission line is electrically connected between the input port and the first output port, and carries two open branches. The second transmission line is electrically connected between the isolated port and the second output port, and carries two open branches. The first bent branch line is electrically connected between the input port and the isolated port. The second bent branch line is electrically connected between the first output port and the second output port. The open branches of the first transmission line and the second transmission line resemble the bone structure of a fish skeleton.

A branch-line coupler, adapted to radio frequency circuits, includes an input port, a first output port, a second output port, an isolated port, a first transmission line, a second transmission line, a first bent branch line, and a second bent branch line. The first transmission line is electrically connected between the input port and the first output port, and carries two open branches. The second transmission line is electrically connected between the isolated port and the second output port, and carries two open branches. The first bent branch line is electrically connected between the input port and the isolated port. The second bent branch line is electrically connected between the first output port and the second output port. The open branches of the first transmission line and the second transmission line resemble the bone structure of a fish skeleton.

Waveguide filters comprising ridges disposed within a waveguide cavity for selecting electromagnetic signals within a frequency passband. An apparatus includes a waveguide filter comprising a waveguide cavity and a plurality of ridges disposed within the waveguide cavity. The apparatus is such that each of the plurality of ridges comprises a first side and a second side, and wherein the first side and the second side are disposed at a non-orthogonal angle relative to one other. The apparatus is optimized for fabrication using metal additive manufacturing techniques.

Waveguide filters comprising ridges disposed within a waveguide cavity for selecting electromagnetic signals within a frequency passband. An apparatus includes a waveguide filter comprising a waveguide cavity and a plurality of ridges disposed within the waveguide cavity. The apparatus is such that each of the plurality of ridges comprises a first side and a second side, and wherein the first side and the second side are disposed at a non-orthogonal angle relative to one other. The apparatus is optimized for fabrication using metal additive manufacturing techniques.

The invention relates to the field of microwave engineering, and in particular, to waveguide-type coupling devices consisting of two coupled lines. The invention can be utilized as a hardware component for thin-film integrated high-frequency units (such as splitter/adder circuits), UHF power amplifiers, couplers, radiofrequency multiplexers, phase shifters, filters and other units in wireless devices used for various purposes. The benefit of the invention claimed lies in increase in efficiency of utilization of the usable area of a dielectric substrate and decrease in overall dimensions of the device and widening of the operating frequency band. This benefit is achieved by inclusion of two electromagnetically coupled microstrip transmission lines to the helical ultra-wideband microstrip quadrature directional coupler, which are designed as flat bilifar helices and are arranged on a dielectric substrate, the backside of which is partially or completely metalized or suspended over a metal surface. The couple differs from other analogous devices in its helices which have more than one turns with one helix of the coupler rotated relative to the other around their common center, while clearances between the coupled transmission lines and their cross-sectional dimensions are constant.

A dielectric having a first main surface and a second main surface facing each other, a main line provided on a side of the first main surface in contact with the dielectric, and a sub line provided on the side of the first main surface in contact with the dielectric are included, the dielectric has a first portion in contact with the main line and a second portion in contact with the sub line, and when the first main surface is viewed in a plan view, between the first portion and the second portion, a third portion having a relative dielectric constant changing along a direction intersecting with the main line and the sub line is located.

A power divider/combiner includes a first transmission line that includes a first part and a second part, and a second transmission line and a third transmission line that are electromagnetically coupled with the first transmission line. The first part, the second part, the second transmission line and the third transmission line are each of a particular length. The first part, the second transmission line and the third transmission line are respectively connected to a first port, a second port and a third port for inputting/outputting signals having a target wavelength equal to four times the particular length.