A coaxial line having a small transmission loss and a variable operating frequency can be provided. The coaxial line includes one or a plurality of unit structures repeatedly arranged in a direction of a central axis. The unit structure includes an inner conductor, two dielectrics arranged in the central-axial direction so as to sandwich the inner conductor therebetween, an outer conductor configured to envelop the inner conductor and the dielectrics, and an inductor connected between the inner conductor and the outer conductor.

A coaxial line having a small transmission loss and a variable operating frequency can be provided. The coaxial line includes one or a plurality of unit structures repeatedly arranged in a direction of a central axis. The unit structure includes an inner conductor, two dielectrics arranged in the central-axial direction so as to sandwich the inner conductor therebetween, an outer conductor configured to envelop the inner conductor and the dielectrics, and an inductor connected between the inner conductor and the outer conductor.

A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

A microwave filter has a housing defining an inner cavity. A first resonator is positioned in a first portion of the inner cavity. A second resonator is positioned in a second portion of the inner cavity. A third resonator is positioned in a third portion of the inner cavity. The first resonator and the third resonator are cross-coupled via an iris. The second resonator is elongated and is coupled to the first resonator and the third resonator. The resulting microwave filter has a frequency response having a transmission zero in the lower stopband. A high-pass filter is realized without the use of a cross-coupling probe.

A coaxial transmission line, e.g. a coaxial cable, includes an inner electrical conductor, an outer electrical conductor, a dielectric region between the inner electrical conductor and the outer electrical conductor, and an electrically thin resistive layer within the dielectric region and concentric with the inner electrical conductor and the outer electrical conductor. The electrically thin resistive layer is a resistive layer configured to be transparent to a subtantially transverse-electromagnetic (TEM) mode of transmission, while absorbing higher order modes of transmission.

A coaxial transmission line, e.g. a coaxial cable, includes an inner electrical conductor, an outer electrical conductor, a dielectric region between the inner electrical conductor and the outer electrical conductor, and an electrically thin resistive layer within the dielectric region and concentric with the inner electrical conductor and the outer electrical conductor. The electrically thin resistive layer is a resistive layer configured to be transparent to a subtantially transverse-electromagnetic (TEM) mode of transmission, while absorbing higher order modes of transmission.

A cavity filter includes a housing, the housing includes resonant cavity groups, each of the resonant cavity groups has two resonant cavities, a partitioning portions is provided between the two resonant cavities, and the partitioning portions is provided with an adjustment passage running through the two resonant cavities. A cover plate is mounted on the housing to cover the resonant cavity groups. A resonating assembly includes a resonant tube, a resonant cap connected with the resonant tube, and a resonant adjustment screw provided in the resonant tube. The resonant tube is disposed on the inner wall of the resonant cavities. The resonant cap is opposite the cover plate. A coupling adjustment assembly is used for reducing the magnetic coupling amount between the two resonant cavities and enhancing the electrical coupling amount between the two resonant cavities.

The present invention allows a connector other than an adapter to have a pin and an insulator, and thus the connector functions as a filter. A module using the connector of the present invention has a small size so as to be economically and widely applicable. The pin is formed to have a multistage structure of at least two stages having different heights to provide a proper filter function.

A multiplexer through which different frequency bands pass, including: a housing that includes an I/O terminal and a channel group which inputs and/or outputs frequencies of different ranges, includes a plurality of connectors, and is separated from the I/O terminal; a low-pass filter provided inside the housing, electrically connected to the I/O terminal, and formed of a distributed constant type; a common capacitor provided in parallel to the low-pass filter and electrically connected to a contact point between the I/O terminal and the low-pass filter; and a cavity filter which includes a plurality of cavities which are formed in the housing and a resonator which is respectively installed in the cavities.

A TEM-line network architecture for RF components used in antenna system, includes an electrically conductive main body forming an outer conductor defining a signal channel, and an electrically conductive center conductor electrically grounded to the main body at predetermined locations. The center conductor is electromagnetically isolated from the outer conductor at RF frequencies while being connected and supported within the signal channel only at at least one of the predetermined locations. The outer conductor is preferably formed of three layers with the center conductor being integral with one of the layers.