Abstract: A high-frequency filter includes a substrate; a ground conductor disposed on one main surface of the substrate and having an opening; a center conductor making up a coplanar line resonator together with the substrate and the ground conductor; and an input line and an output line each of which has a microstrip line structure and is disposed on the other main surface of the substrate to electromagnetically couple with the center conductor. At least one of the input line and the output line has a closed loop line portion surrounding a corresponding end of the center conductor and crossing the center conductor transversely through the substrate. On the other main surface of the substrate, a stub overlapping with the center conductor is arranged from a transverse position where the closed loop line portion crosses the center conductor.

Abstract: In a balun for mutually converting an unbalanced line for unbalanced input/output and a balanced line for balanced input/output, the unbalanced line and the balanced line are microstrip lines including a signal line arranged on one main surface of a substrate and a ground conductor arranged on the other main surface of the substrate. The balun further includes a slot line formed by a aperture line arranged in the ground conductor in the other main surface. The microstrip line as the unbalanced line includes one end portion used as an input/output end and the other end portion that traverses the slot line, electromagnetically couples to the slot line, and functions as an electric short-circuited end. The central portion of the microstrip line as the balanced line traverses the slot line and electromagnetically couples to the slot line. Both ends of this microstrip line serves as the input/output ends.

Abstract: A temperature-compensated crystal oscillator for surface mounting wherein an IC chip into which is integrated a temperature-compensated device having an oscillating circuit and a temperature sensor, which supplies a compensation voltage to a variable-voltage capacitor element of the oscillating circuit, and which also has IC terminals disposed along two edges comprising at least diagonally opposite corner portions of one main surface that acts as a circuit function surface is affixed with the use of bumps to an inner base surface of a main container that is concave in section, and one edge portion of a crystal piece is affixed to an inner wall step portion of the main container; wherein an active element of the oscillating circuit that acts as a heat source and a temperature sensor of the temperature-compensated device are disposed at diagonally opposite corner regions of the IC chip at the greatest distance apart.

Abstract: The crystal oscillator device for simultaneously generating oscillator signals with a plurality of oscillation modes of a crystal unit, comprising: a primary resonator unit filtering the oscillator signal with a primary oscillation mode, which is one of the oscillation modes, from the output of the crystal unit, a secondary resonator unit filtering the oscillation signal, bearing a different resonance frequency from that of the primary resonator unit, with the primary oscillation mode from the output of the crystal unit, a primary phase synthesis unit, synthesizing the phases of the output signal of the primary resonator unit and the output signal of the secondary resonator unit, a tertiary resonator unit, a quaternary resonator unit, and a secondary phase synthesis unit.

Abstract: There is disclosed a crystal oscillator in which when a base ground type crystal oscillation circuit is used, a temperature characteristic of an oscillation frequency is improved to omit a measurement operation of the temperature characteristic of the oscillator, and manufacturing is facilitated to reduce a manufacturing time.

Abstract: A temperature-compensated crystal oscillator for surface mounting wherein an IC chip into which is integrated a temperature-compensated device having an oscillating circuit and a temperature sensor, which supplies a compensation voltage to a variable-voltage capacitor element of the oscillating circuit, and which also has IC terminals disposed along two edges comprising at least diagonally opposite corner portions of one main surface that acts as a circuit function surface is affixed with the use of bumps to an inner base surface of a main container that is concave in section, and one edge portion of a crystal piece is affixed to an inner wall step portion of the main container; wherein an active element of the oscillating circuit that acts as a heat source and a temperature sensor of the temperature-compensated device are disposed at diagonally opposite corner regions of the IC chip at the greatest distance apart.

Abstract: A surface mount quartz crystal oscillator includes: a quartz crystal unit having a plurality of first connection terminals on its bottom surface, and a mounting substrate formed with a depression, which accommodates an IC chip inside the depression. The side of the mounting substrate having the opening of the depression bonds with the bottom surface of the crystal unit. The IC chip integrates an oscillation circuit that employs the crystal unit and a temperature compensation circuit. Second connection terminals corresponding to the first connection terminals are provided on the upper surface of the frame wall that encloses the depression in the mounting substrate. A notched portion is formed in the frame wall, and resin is injected from this notched portion into the depression to fill at least the region between the first connection terminals.

Abstract: A harmonic oscillator comprises a transmission line resonator in which an oscillation frequency depends on an electrical length of a transmission line and both ends of the transmission line are electrical open ends; an active element for oscillation as a negative resistance connecting to the transmission line resonator; an output line connected to a midpoint portion of the transmission line resonator; and electrical and/or physical suppressing means for suppressing a voltage displacement distribution of second harmonic among the even-order harmonics. The suppressing means is provided at a position which is at least a minimum voltage displacement portion for the second harmonic between the midpoint portion and either ends of the transmission line resonator.

Abstract: A slot-line planar antenna has a substrate, an outer conductor disposed on one principal surface of the substrate and having an opening defined therein, an inner conductor disposed on the one principal surface of the substrate and positioned within the opening, the outer conductor and the inner conductor jointly defining a looped aperture line therebetween, and an electronic device electrically interconnecting the outer conductor and the inner conductor for controlling an electromagnetic wave field of a slot line provided by the aperture line.

Abstract: In a balun for mutually converting an unbalanced line for unbalanced input/output and a balanced line for balanced input/output, the unbalanced line and the balanced line are microstrip lines including a signal line arranged on one main surface of a substrate and a ground conductor arranged on the other main surface of the substrate. The balun further includes a slot line formed by a aperture line arranged in the ground conductor in the other main surface. The microstrip line as the unbalanced line includes one end portion used as an input/output end and the other end portion that traverses the slot line, electromagnetically couples to the slot line, and functions as an electric short-circuited end. The central portion of the microstrip line as the balanced line traverses the slot line and electromagnetically couples to the slot line. Both ends of this microstrip line serves as the input/output ends.

Abstract: A surface-mounted oscillator configured by integrally accommodating an oscillation element, an IC chip, and a circuit element in a surface-mounted package is characterized in that the oscillation element, the IC chip, and the circuit element are arranged in positions in a direction vertical to a mounting surface of the surface-mounted oscillator. The oscillation element may be an oscillation element using bulk wave oscillation, or an oscillation element using surface wave oscillation.

Abstract: A push-push high frequency oscillator comprises a pair of amplifiers for oscillation, a loop-shaped microstrip line for connecting inputs of the pair of amplifiers to each other and connecting outputs of the pair of amplifiers to each other, a slot line disposed between the inputs and the outputs of the pair of amplifiers for electromagnetically coupling with the microstrip line, a nonlinear circuit for enhancing the level of harmonic components in an applied synchronization signal, a coupler circuit for electromagnetically coupling the output of the nonlinear circuit to the microstrip line, and a filter circuit disposed at the output of the nonlinear circuit. The filter circuit filters harmonic components of the synchronization signal such that the two oscillation systems are injected with the same frequency components as the fundamental wave or frequency components twice as high as the fundamental wave to increase frequency stability.

Abstract: A planar harmonic high frequency oscillator comprises a pair of amplifiers for oscillation, a micro-strip line for connecting between inputs of the pair of amplifiers and between outputs of the amplifiers, a slot line disposed between the inputs and the outputs of the pair of the amplifiers for electromagnetically coupling with the micro-strip line, an output line connected to the micro-strip line at a position at which the micro-strip line traverses the slot line between the inputs or outputs of the pair of amplifiers, and an electronic device for connecting conductors on both sides of the slot line, and for controlling an electromagnetic wave field of the slot line in response to a control signal applied thereto. Two oscillation systems which oscillate in opposite phases with respect to the fundamental wave of oscillation are formed to generate an even-order harmonic of the fundamental wave.

Abstract: A high frequency oscillator comprises a transmission line resonator having a midpoint which serves as a null potential point, a pair of active devices for oscillation respectively connected to a pair of mutually opposite-phase resonance wave points for the transmission line resonator, and a plurality of output lines each having one end connected to the transmission line resonator at a point symmetric to the midpoint, and the other end commonly connected to a connection. The pair of active devices share the resonator and oscillate in opposite phases to each other. The plurality of output lines are coupled to the transmission line resonator respectively at maximum displacement distribution points for a standing wave of an 2n-th harmonic in the transmission line resonator, where n is an integer equal to or larger than two. Even-order harmonic components of 2(n?1)-th or lower are suppressed at the connection.

Abstract: A frequency-variable high frequency filter comprises: a substrate; a ground conductor having an opening provided on one principal surface of the substrate; a center conductor provided in the opening to make up a coplanar line resonator with the substrate and the ground conductor; an input line and an output line provided on the other principal surface of the substrate and electromagnetically coupled with the center conductor; and a variable reactance element. The center conductor is divided into two conductor section at the position of the null point of the voltage displacement of a standing wave created in the coplanar line resonator so that the two conductor sections are separated in the longitudinal direction of the center conductor. The variable reactance element is inserted in the center conductor to connect the two conductor sections of the center conductor.

Abstract: A high-frequency filter includes a substrate; a ground conductor disposed on one main surface of the substrate and having an opening; a center conductor making up a coplanar line resonator together with the substrate and the ground conductor; and an input line and an output line each of which has a microstrip line structure and is disposed on the other main surface of the substrate to electromagnetically couple with the center conductor. At least one of the input line and the output line has a closed loop line portion surrounding a corresponding end of the center conductor and crossing the center conductor transversely through the substrate. On the other main surface of the substrate, a stub overlapping with the center conductor is arranged from a transverse position where the closed loop line portion crosses the center conductor.

Abstract: A planar array antenna using a multi-layer substrate having an intermediate layer conductor in a laminated face comprises: four pieces of planar antenna elements disposed at each of geometrically square shaped apexes; first and second slot lines formed in the intermediate layer conductor, and intersecting each other; first to fourth microstrip lines formed along each side of geometrical squares so as to be coupled to each antenna element, and at the same time, electromagnetically coupled to first and second slot lines at both ends of these slot lines; and fifth and sixth microstrip lines, the top end sides thereof traversing the first and second slot lines, respectively, so as to be electromagnetically coupled to the first and second slot lines.

Abstract: A high frequency oscillator has a substrate, a resonator circuit which is disposed on one principal surface of the substrate and consists of a closed loop-shaped slot line including an inner conductor and an outer conductor, an electric boundary point set on the slot line, a two-port negative resistance element for connecting between the inner conductor and outer conductor, and an output line electrically connected to the slot line. The electric boundary point is set by connecting, for example, a stub to the resonator circuit. The stub functions as an electrically short-circuited end or an electrically open end. A Gunn diode is preferably used for the negative resistance element, and inserted at a position of the slot line resonator circuit at which impedance matching is achieved.

Abstract: A high frequency oscillator which obtains an oscillation output by combining the outputs of two oscillators has a substrate, first and second amplifiers for oscillation so disposed that their output ends be opposite each other, first and second signal lines each configuring a closed oscillation loop by connecting the input ends and the output ends of the first and second amplifiers, respectively, these being disposed on a first principal surface of the substrate, and a grounding conductor disposed on a second principal surface of the substrate and configuring a strip line together with each of the signal lines. An opening, where the grounding conductor is removed, is bored in the second principal surface and a coplanar line structure is configured by arranging the first and second signal lines close to each other in the area of the opening.

Abstract: A temperature-compensated crystal oscillator is provided with an IC (integrated circuit) having a power supply terminal, an output terminal, and an automatic frequency control (AFC) voltage input terminal. In the temperature-compensated crystal oscillator, at least one oscillation circuit is integrated and the frequency-temperature characteristic of a quartz crystal unit is compensated. The temperature-compensated crystal oscillator includes one or more damping resistors for reducing the resonance acuteness of parasitic resonance circuits which result from inductance produced when mounting the IC on a wiring board and stray capacitance existing in the vicinity of each terminal of the IC. The dumping resistors are connected to at least one of the power supply terminal, output terminal, and automatic frequency control voltage input terminal.