Abstract: The present invention provides a portable transceiver where a broadband of an antenna characteristic can be realized and efficiency is improved. The present invention provides a portable transceiver includes a first housing (7) having a first circuit board (5) in its inside and an input section at its surface, a second housing (8) having a second circuit board (6) in its inside and a display section at its surface, and a coupling section (4) for electrically coupling the first circuit board (5) with the second circuit board (6). An antenna section (3) and an element section (9) are disposed at one of the circuit boards, and the first housing (7) and the second housing (9) are coupled with each other via a hinge section (2) and can be folded.

Abstract: The disclosed is a downsized and power saving antenna duplexer. The antenna duplexer includes: diplexer; first surface acoustic wave filter to transmit/receive low channel frequency band signals; first phase shift circuit to match the transmission phase with the reception phase of first surface acoustic wave filter; second surface acoustic wave filter to transmit/receive high channel frequency band signals; second phase shift circuit to match the transmission phase with the reception phase of second surface acoustic wave filter. Diplexer, first phase shift circuit and second phase shift circuit are formed in a monolithic structure in package that includes surface acoustic wave filters. The configuration can provide the antenna duplexer with a compact size, a lower current consumption and a highly efficient performance.

Abstract: A wireless device includes a first antenna element resonating with a first frequency, a first feeding point coupled to the first antenna element and disposed on a ground plane in the wireless device, a first matching circuit of which first end is coupled to the first feeding point, a second antenna element resonating a second frequency higher than the first frequency, a second feeding point coupled to the second antenna element and disposed on the ground plane, a second matching circuit of which one end is coupled to the second feeding point, and a radio circuit coupled via a transmission line to a common connection point shared by respective second ends of the first and second matching circuits.

Abstract: An antenna capable of attaining the miniaturization thereof and the widening of a band in use, and an electronic device containing this antenna therein, having a miniaturized structure and adaptable to a wide band. This antenna is provided with a feeding element having a feeder end, an antenna core provided with the feeding element on an outer circumference thereof, a feeder lead connected to the feeder end, and a magnetic member covering the feeder end. This electronic device is provided with the antenna, a transmission system, and a reception system, and the feeder lead of the antenna is connected to at least one of the transmission system and reception system.

Abstract: A laminated high frequency device includes a laminated body including plural magnetic sheets having relative permeabilities larger than 1, inductor patterns for forming plural inductors in the laminated body, and capacitor patterns forming a capacitor. The capacitor patterns are opposed to each other about another sheet of the laminated body. The inductors have large inductances without thickening of the magnetic sheet or thinning of the inductor patterns providing a large conductor loss. This arrangement reduces a size of the laminated high frequency device while providing isolation between the inductors.

Abstract: An antenna device which includes the first antenna element having one end open and the other end connected to a power feeder, and the second antenna element, having both ends open. The second antenna element is disposed on the outer peripheral surface of the first antenna element in insulated state. The other end of the first antenna element is connected to the power feeder through the first ring-shaped conductor.

Abstract: A design method for an antenna which shortens the time for antenna design and greatly contributes to reduction in costs of antenna development, and an antenna using the same are provided. This design method for the antenna can design an optimum antenna matching with the configuration of a cellular telephone for a short time. This design method for the antenna uses a database prepared beforehand and a relational expression obtained from design parameters and characteristic parameters, and can obtain desired antenna characteristics for a short time.

Abstract: A low pass filter (LPF) can realizes a sophisticated transmission filter usable in a dual-band application. The transmission filter features a compact size, a low cost, a lower insertion loss, and an excellent harmonics-suppression characteristic. In the LPF, a high pass filter (HPF) section working in a high frequency band or a band pass filter (BPF) section, is coupled with a first LPF section in parallel between an input terminal and an output terminal. The HPF section or the BPF section includes a switch circuit formed of one diode that switches the pass band thereof to a rejection band. When a signal supposed to pass through the first LPF section is input to the input terminal, the switch circuit is activated to change the HPF or the BPF section to the rejection band for blocking a second harmonics component from passing through the HPF or the BPF section.

Abstract: An antenna duplexer has a power durability to a signal input from an antenna terminal and has stable characteristics. The antenna duplexer includes an input terminal, a transmission filter including a surface acoustic wave (SAW) filter having an input port connected to the input terminal, a phase shifter having an input port connected to an output port of the transmission filter, a reception filter having an input port connected to an output port of the phase shifter, an output terminal connected to the output port of the reception filter, and an antenna terminal connected between the transmission filter and the phase shifter. The transmission filter has a power durability at the output port of the filter, being equal to or larger than a power durability at the input port of the filter.

Abstract: A surface acoustic wave filter with little electromagnetic coupling between wires and improved attenuation characteristics is provided. This surface acoustic wave filter comprises: a package having a concavity in the shape of stairs made by laminating dielectrics, a surface acoustic wave element provided on the bottom face of the concavity, a plurality of wires for connecting between a plurality of electrodes provided on the surface of the surface acoustic wave element and a plurality of electrodes provided on one same plane portion of the stairs of the package in correspondence to a plurality of electrodes, and a dummy wire provided between the wires.

Abstract: A radio frequency (RF) hybrid switch module includes an antenna duplexer integrated with a surface acoustic wave (SAW) filter used in a mobile communication device such as a cellular phone. The switch module handles a transmitted signal and received signal of different frequency bands. A parasitic inductance due to a mounting of the SAW filter is reduced, so that an attenuation characteristic at a low frequency of the SAW filter is improved.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: A high-frequency switch having two input terminals and two output terminals of which a broad pass band is required has (i) a circuit board that has two input electrodes along one side and two output electrodes along another side, and (ii) four PIN diodes mounted on this circuit board. Each side of the quadrangle made by connecting the input electrodes and the output electrodes is not parallel to the corresponding side of the quadrangle made by connecting electrodes for mounting the PIN diodes. Each side and the corresponding side form an angle other than 180°. This structure can provide a high-frequency switch capable of reducing a transmission loss in the paths and facilitating impedance matching.

Abstract: A small antenna, which is used in a mobile radio communication apparatus such as a portable telephone, operating in a broader frequency band a conventional antenna, operating corresponding to plural frequencies, and being disposed in a case is provided. The radio communication apparatus including the antenna is also provided. The antenna includes a first conductive radiator having a planer shape, a second conductive radiator having a helical shape, and a planar feeding section that is disposed between the first conductive radiator and the ground plane, is isolated from them, and supplying power by electromagnetic coupling.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: A small-sized multi-frequency antenna duplexer using surface acoustic wave filters to be applicable to a plurality of frequencies. This antenna duplexer includes two surface acoustic wave (SAW) filters for transmission and reception having passing bands of mutually different frequencies, a phase shift substrate, and a package for accommodating them. The passing band of each antenna duplexer is mutually different from other's passing band. This multi-frequency antenna duplexer includes a plurality of antenna duplexers. In one package, transmitter surface acoustic wave filters, receiver surface acoustic filters, and phase shift substrates are mounted. Thus, the multi-frequency antenna duplexer are reduced in size.

Abstract: A small radio-frequency hybrid switch module is provided for switching between transmitted signals and received signals in plural frequency bands. This module includes: a laminated body including a dielectric layer; a diplexer; a switching circuit; a low pass filter (LPF); a conductive pattern provided on the dielectric layer for forming at least one of the diplexer, the switching circuit and the LPF; a surface acoustic wave (SAW) filter mounted on the laminated body; a cover provided on the SAW filter for forming a cavity which allows surface acoustic wave vibration and for hermetically sealing the cavity; and a semiconductor switching device mounted on the laminated body for forming a part of the switching circuit.

Abstract: A radio frequency (RF) hybrid switch module includes an antenna duplexer integrated with a surface acoustic wave (SAW) filter used in a mobile communication device such as a cellular phone. The switch module handles a transmitted signal and received signal of different frequency bands. A parasitic inductance due to a mounting of the SAW filter is reduced, so that an attenuation characteristic at a low frequency of the SAW filter is improved.

Abstract: A laminated high frequency device includes a laminated body including plural magnetic sheets having relative permeabilities larger than 1, inductor patterns for forming plural inductors in the laminated body, and capacitor patterns forming a capacitor. The capacitor patterns are opposed to each other about another sheet of the laminated body. The inductors have large inductances without thickening of the magnetic sheet or thinning of the inductor patterns providing a large conductor loss. This arrangement reduces a size of the laminated high frequency device since a necessary isolation between the inductors is assured.

Abstract: A high frequency composite switch module for a mobile communication device, wherein high frequency circuits such as a power amplifier, a circuit functioning as a transmitter/receiver switching circuit, a surface acoustic wave (SAW) filter for reception, and the like are modularized into one unit. A transmitter circuit includes a transmitter side impedance converter comprising an impedance matching circuit and an impedance converter circuit, a power amplifier and a power supply unit. A receiver circuit includes a receiver-side impedance converter comprising a phase shifting circuit and a SAW filter. The power amplifier and the impedance converter circuit are integrated into one IC chip. At least one of the matching circuit, the power supply unit and the phase shifting circuit is formed inside a multilayer board comprised of a conductor layer and a dielectric layer. The IC chip and the SAW filter are also mounted on the multilayer board.