Murata Manufacturing Co., Ltd.

Makoto Tochigi

Norio Yoshida

Ken Tonegawa

Tomoya Bando

A power distributing and synthesizing device which comprises first to third signal terminals, first and second transmission lines and a resistor. The first signal terminal is provided at the connection portion between one end of the first transmission line and one end of the second transmission line; the second signal terminal is provided at the other end of the first transmission line; and the third signal terminal is provided at the other end of the second transmission line. The resistor is connected between the second signal terminal and the third signal terminal. LC serial resonators each comprising an inductor and a capacitor are respectively connected between the first to third signal terminals and a ground.

Power distributing and synthesizing device and mobile communication equipment using same

A stripline-type delay line has a plurality of rectangular sheet layers which are made from a dielectric material with a relative dielectric constant .di-elect cons.r of about 6.3, having magnesium oxide and silica as main components. One sheet layer is placed at the top, and the other layers are laminated thereunder in the following order: a sheet layer on which a first ground conductor is formed on its upper surface, a sheet layer on which a transmission line folded in a meander shape is formed on its upper surface, and a sheet layer on which a second ground conductor is formed on its upper surface. On side faces of the laminated dielectric and on adjacent portions of the upper and lower surfaces, an input terminal, an output terminal, and ground terminals are formed by printing, and then the dielectric is baked. The length A of the opposing line sections of said transmission line is preferably set such that the first peak frequency f of the delay time is within or above the frequency range of use, and substantially satisfies the following expression: ##EQU1## wherein Co indicates the speed of light, and .di-elect cons.r indicates the relative dielectric constant of said dielectric layers.

Delay line for providing a delay time at a desired peak frequency

A delay line is produced by firing a laminated body and terminals (an input terminal, an output terminal and grounding terminals) which are formed by printing or another method on the side faces, top and bottom surfaces of the laminated body. The laminated body has four dielectric rectangular sheet layers (dielectric constant .epsilon.r=approximately 6.3) containing mainly barium oxide, aluminum oxide and silica. The laminated body is formed by layering from top to bottom, in the order given, a first sheet layer, a second sheet layer which has a grounding conductor formed on its top surface, a third sheet layer which has a transmission line meanderingly formed on its top surface, and a fourth sheet layer which has another grounding conductor formed on its top surface. The transmission line has a meandering shape which defines a meander width, and has delay time peaks at respective frequencies, wherein the frequency fn at the n-th delay time peak substantially satisfies the formula: ##EQU1## where Co represents the speed of light; .epsilon.r, the dielectric constant of the dielectric layer; A, the meander width of the meanderingly formed transmission line; and n, a natural number. The transmission line may be formed by connecting in series a plurality of meanderingly formed transmission line segments having different respective meander widths. The plurality of transmission line segments may be formed opposite each other with the dielectric layer provided therebetween, the plurality of transmission line segments being connected to each other at ends thereof.

Growing community of inventors

Shiga-ken, Japan

Makoto Tochigi