A combining balun includes: a first input side conductive member wound around a first axis on a first surface, which intersects with the first axis, and has a first portion between a second axis and the first axis and through which a first input current flows; a second input side conductive member wound around the second axis on the first surface and has a second portion between the second axis and the first portion and through which a second input current flows; a first output side conductive member wound around the first axis on a second surface, which faces the first surface, and has a third portion which faces the first portion; and a second output side conductive member wound around the second axis on the second surface and has a fourth portion which faces the second portion.

A MoCA splitter device may include an input port, a first output port and a second output port, a first transmission line configured to connect the input port to the first output port, a second transmission line configured to connect the input port to the first output port, a first isolation element configured to connect the first transmission line to the second transmission line, a second isolation element configured to connecting the first transmission line to the second transmission line. The first isolation element and the second isolation element are configured to provide an isolation level between the first output port and the second output port that is less than a predetermined isolation level of about less than 16 dB in a MoCA frequency band.

A filtering power divider includes a first partial transmission line having a first electrical length, a second partial transmission line having a second electrical length, and a third partial transmission line having the second electrical length. The first, second, and third partial transmission lines connect to form a T-junction, and a sum of the first and second electrical lengths is ninety degrees. Thus, the first and second partial transmission lines cooperate to act as a quarter-wave transmission line. Similarly, the first and third partial transmission lines cooperate to act as a quarter-wave transmission line. Additional transmission lines may be connected to the first, second, and third partial transmission lines to implement a filter between an input port and each of two output ports.

A filtering power divider includes a first partial transmission line having a first electrical length, a second partial transmission line having a second electrical length, and a third partial transmission line having the second electrical length. The first, second, and third partial transmission lines connect to form a T-junction, and a sum of the first and second electrical lengths is ninety degrees. Thus, the first and second partial transmission lines cooperate to act as a quarter-wave transmission line. Similarly, the first and third partial transmission lines cooperate to act as a quarter-wave transmission line. Additional transmission lines may be connected to the first, second, and third partial transmission lines to implement a filter between an input port and each of two output ports.

A waveguide microstrip line converter includes a waveguide, a dielectric substrate, a ground conductor including a slot, and a line conductor. The line conductor includes a first section that is a microstrip line having a first line width, a conversion unit that is a second section positioned immediately above the slot and having a second line width greater than the first line width, and a third section extending from the second section in a first direction and performing impedance matching between the first section and the second section. One of the opposite ends of the third section in the first direction is connected to the second section. The first section extends in a second direction perpendicular to the first direction continuously from the other end of the opposite ends of the third section.

A bias tee circuit comprises: a combining path having first and second ends and configured to transmit a combined signal which comprises a combination of an RF signal and a DC signal; an RF path having first and second ends and configured to transmit the RF signal included in the combined signal; a DC path having first and second ends and configured to transmit the DC signal included in the combined signal; and an impedance transformer connected between the first end of the combining path, the first end of the RF path and the first end of the DC path, and configured to make the reflection coefficient of the transmitted RF signal have at least two resonant modes within an operating RF band.

A bias tee circuit comprises: a combining path having first and second ends and configured to transmit a combined signal which comprises a combination of an RF signal and a DC signal; an RF path having first and second ends and configured to transmit the RF signal included in the combined signal; a DC path having first and second ends and configured to transmit the DC signal included in the combined signal; and an impedance transformer connected between the first end of the combining path, the first end of the RF path and the first end of the DC path, and configured to make the reflection coefficient of the transmitted RF signal have at least two resonant modes within an operating RF band.

An apparatus is provided for signal communication. This signal communication apparatus includes a waveguide with an internal channel. The internal channel includes a plurality of channel segments interconnected at a junction. The waveguide includes a first surface and a second surface. The first surface and the second surface partially form a peripheral boundary of the internal channel at the junction. The first surface meets the second surface at a first corner. The first surface is angularly offset from the second surface by an obtuse angle.

A T-junction with high isolation and a method for fabricating the same are provided. The T-junction includes a power divider/combiner configured to divide or combine power, a dielectric substrate disposed perpendicular to a lower plane of the power divider/combiner, and a dielectric holder configured to dispose the dielectric substrate.

A T-junction with high isolation and a method for fabricating the same are provided. The T-junction includes a power divider/combiner configured to divide or combine power, a dielectric substrate disposed perpendicular to a lower plane of the power divider/combiner, and a dielectric holder configured to dispose the dielectric substrate.