Abstract: The elliptical response bandpass filter according to the invention comprises a plurality N of cavities connected in series by means of in-phase coupling loops; the first cavity is in addition connected to the last by a complementary phase-inversion coupling loop in order to generate transmission zeros at determined frequencies.

Abstract: A duplexer according to the present invention includes a first port, a second port and a third port for external input/output, a first path formed between the first port and the third port, a second path formed between the second port and the third port, a phase shifting part provided for each path, and a resonating part provided for each path. At least any of the resonating parts has a ring conductor having a length equal to one wavelength at a resonant frequency or an integral multiple thereof, a plurality of passive circuits, and a plurality of switches each of which is connected to a different part of the ring conductor at one end and to any of the passive circuits at the other end. A switch may simply be connected to a ground conductor instead of being connected to the passive circuit.

Abstract: A connector for transmitting signals using electrostatic coupling, comprises an inner first conductor portion and an outer first conductor portion respectively connected to two signal lines, an inner electrode portion having a facing area larger than the cross-sectional area of the inner first conductor portion in the direction perpendicular to the direction of the common axis, an outer electrode portion outside it, an inner second conductor portion for electrically connecting between the inner first conductor portion and the inner electrode portion, and an outer second conductor portion outside it, wherein the ratio of outer diameter of the inner second conductor portion to inner diameter of the outer second conductor portion is set to provide substantially fixed characteristic impedance at every position along the direction of the common axis.

Abstract: The invention relates to a magnetically tunable filter having a filter housing and having two tunable resonator spheres which comprise magnetizable material and are arranged next to one another in two filter branches. Each filter branch comprises a coplanar line arranged on a substrate layer and extending in the direction of an electrical connection, as well as a common coupling opening so that the two filter branches are connected to one another. A resonator sphere is respectively positioned on each side of the coupling opening inside the two filter branches.

Abstract: An embedded resonator sharpens the frequency characteristics of a coaxial low pass filter. The resonator introduces finite transmission zeros to the response of the low pass filter, thereby suppressing spurious modes occurring just above the operating frequency. Two parameters are used to tune the operation of the embedded resonator. The length of an insert into the filter's transmission line substantially controls the resonant frequency, and the gap width substantially controls the coupling of the embedded resonator to the low pass filter.

Abstract: An LC composite component has a unique structure that makes it easy to set frequency characteristics while reducing a circuit area and the number of layers. The LC composite component includes a laminated body including a plurality of dielectric layers. The laminated body is produced by forming input and output electrodes and an LC resonant circuit therein. The LC composite component includes a capacitor, which includes an elongated electrode portion having an elongated shape. The elongated electrode portion faces a flat electrode portion having a flat shape, with one of the dielectric layers interposed therebetween. At the same time, the elongated electrode portion constitutes an open stub that is open at a tip end.

Abstract: A resonator system is presented that has first and second cavity resonators for use in an RF amplifying system employing an RF amplifier device having an output circuit and an RF signal broadcasting antenna coupled to the output circuit. The resonators are interposed between the amplifying device output terminal and the antenna. The first resonator is comprised of a transmission line being a length of two coaxial conductors and tuned to the 3rd harmonic of the operating frequency (3fo). Each resonator has first and second opposing ends with the first end being an open end and the second end being a shorted end. The open end of the first resonator is connected to the output terminal of the RF amplifying device. The second resonator is connected in series with the first resonator and is tuned to the fundamental operating frequency (fo).