Abstract: A resonator having an improved spurious characteristic is provided. The resonator comprises a dielectric substrate having a plurality of strip lines extending longitudinally from the central portion of the upper surface toward the rear surface of the substrate by turning downward along the shorter side surfaces of the substrate such that the strip lines extending from both sides of the upper surface of the substrate are arranged in an alternative fashion with their narrowed top end portions overlapping each other in spaced apart relationships so as to be electromagnetically coupled. The portion of the dielectric substrate sandwiched between the opposing upper and rear portions of each strip line forms a capacitor. Further, a ground electrode is formed at the center of the rear surface of the substrate so as to be connected to the end portions of the strip lines. Input and an output electrode continuous with some of the strip lines, respectively, are also provided on the rear surface of the substrate.

Abstract: A compact high frequency hybrid switch suitably operated in a diversity-type antenna system. A high frequency hybrid switch is comprised of: first to fourth ports; a first high frequency switch circuit for switching a connection established between the first port and the third port; and a second high frequency switch circuit for selecting one from two connections respectively established between the first port and the fourth port, and between the second port and the fourth port. The first and second high frequency switch circuits include respective series and parallel arrangements of diodes, capacitors and distributed constant signal lines which reduce the size and improve the reliability of the switch.

Abstract: An electronic component which is employed in the frequency range in the microwave band or above is mounted on a circuit board. The circuit board comprises two linear transmission line members, a ground electrode, and an electric insulating substrate provided with the transmission line members and the ground electrode on its major surface. The electronic component comprises external electrodes which are formed on its side surfaces. Holding patches which are formed on the lower surface of the electronic component are bonded to the ground electrode by solder members, thereby fixing the electronic component to the circuit board. At this time, small clearances are defined between the electronic component and the circuit board through the solder members, whereby the external electrodes are electromagnetically coupled with the transmission line members and the ground electrode through the clearances respectively.

Abstract: A surface-mountable antenna unit including a dielectric substrate having a rectangular plane shape which is provided on a side surface and/or a bottom surface thereof with a ground electrode, and a radiator, provided with a radiating part having a substantially rectangular plane shape, which is fixed to the dielectric substrate so that the radiator is opposed to a top surface of the dielectric substrate, with a feed part provided on a side surface of a laminate which is formed by the dielectric substrate and the radiator.

Abstract: Coil electrodes having a U-shape and shield electrodes having a plane shape are formed on plural dielectric layers. The coil electrodes are connected via through holes which are formed through the dielectric layers, and a spiral electrode is formed. An earth terminal and an input/output terminal are drawn out from the coil electrode to the end portion of the dielectric layer. The shield electrodes are formed on both of the coil electrodes. The dielectric layers are laminated, and the shield electrode and the earth terminal are connected by an external electrode. An external electrode connected to the input/output terminal is formed. A band-pass filter is made by forming plural spiral electrodes and magnetically coupling the spiral electrodes.

Abstract: A laminated high-frequency low-pass filter includes a first dielectric layer. A second dielectric layer, a third dielectric layer, a fourth dielectric layer, and a fifth dielectric layer are laminated on the first dielectric layer. An earth electrode is formed on the first dielectric layer. A first capacitive open-circuited stub electrode, a second capacitive open-circuited stub electrode and a third capacitive open-circuited stub electrode are formed on the second dielectric layer. A first strip line electrode and a second strip line electrode are formed on the third dielectric layer. The first and second strip line electrodes are formed as meander lines. A shield electrode is formed on the fourth dielectric layer.

Abstract: Three coil electrode patterns are formed on one surface of a plate containing of a dielectric material. These coil electrode patterns are formed in loop shape, and are disposed in a magnetically connecting state with respect to each other. An input/output terminal pattern and an earth terminal pattern are drawn out from each of the two coil electrode patterns which are disposed toward the end portions of the plate. The input/output terminal pattern and the earth terminal pattern are disposed at a distance for each other so as to provide a predetermined impedance. An earth electrode pattern is drawn out from the center coil electrode pattern. An earth electrode pattern is formed opposite the coil electrode patterns with the plate between them. Earth terminal patterns are formed to the earth electrode pattern. The earth terminal patterns of the earth electrode pattern are connected to the earth terminal patterns of the coil electrode patterns.

Abstract: A composite electronic component containing at least two circuit elements including an inductor.

Abstract: A dielectric resonator for surface mounting comprising two dielectric layers; a conductive layer formed on a plane interposed between the two dielectric layers, the conductive layer being lengthy and having an inductance determined by a length thereof; grounding electrode layers provided on outer surfaces of the two dielectric layers; protective layers for covering outer surfaces of the grounding electrode layers; a first outer connecting terminal provided on a surface of a main body of the resonator and electrically connected to an end of the conductive layer and to the grounding electrode layers, the main body comprising the protective layers, the dielectric layers, the conductive layer and the grounding electrode layers; and a second connecting terminal provided on a surface of the main body and electrically connected to a portion of the conductive layer, the portion being far from the above end of the conductive layer.

Abstract: A bandpass filter consisting of two dielectric resonators coupled with each other, the bandpass filter comprising: a filter body including an intermediate grounding layer, a first pair of dielectric layers, a pair of inductor layers, a second pair of dielectric layers, a pair of outer grounding electrode layers and a pair of protecting layers, one of each pair being laminated on an upper surface of the intermediate grounding electrode layer in the above order to constitute a first resonator and the other of each pair being laminated on a bottom surface of the intermediate grounding electrode layer in the above order to constitute a second resonator; and a plurality of outer connecting terminals provided on outer surfaces of said filter body and connected to predetermined layers among the intermediate grounding electrode layer, inductor layers and outer grounding electrode layers; wherein the intermediate grounding electrode layer has a coupling portion for magnetically coupling one inductor layer formed on th