Abstract: There is provided an antenna device for use with a portable terminal, which can be used in different frequency bands by combining antenna characteristics. Whip antenna is electrically connected to power feeder through contact member, and resonates in a UHF band or higher when extended. Coiled antenna is electrically connected to power feeder through frequency filter mounted on device board. Frequency filter is set to a low impedance in a VHF band to supply electric power to coiled antenna. With this arrangement, external whip antenna is excited in the UHF band or higher, and built-in coiled antenna is mainly excited in the VHF band. The antenna device is thus capable of sending or receiving radio waves in a wide frequency band.

Abstract: There is provided an antenna device for use with a portable terminal, which can be used in different frequency bands by combining antenna characteristics. Whip antenna is electrically connected to power feeder through contact member, and resonates in a UHF band or higher when extended. Coiled antenna is electrically connected to power feeder through frequency filter mounted on device board. Frequency filter is set to a low impedance in a VHF band to supply electric power to coiled antenna. With this arrangement, external whip antenna is excited in the UHF band or higher, and built-in coiled antenna is mainly excited in the VHF band. The antenna device is thus capable of sending or receiving radio waves in a wide frequency band.

Abstract: In an antenna device having a coil element 11 composed of metallic wire that is connected to a power feeding point by causing one end portion to be coupled to a caulking portion 13-1 of a power feeding plate 13 connected to the power feeding point on a circuit board 1, a plate element section 13-2 is constructed using a part of the power feeding plate 13 when an antenna element whose element length is different from that of the coil element 11 is added. This makes it possible to obtain the antenna device that can achieve a wider bandwidth while restraining the number of parts and a cost from being increased.

Abstract: There is provided an antenna device for use with a portable terminal, which can be used in different frequency bands by combining antenna characteristics. Whip antenna is electrically connected to power feeder through contact member, and resonates in a UHF band or higher when extended. Coiled antenna is electrically connected to power feeder through frequency filter mounted on device board. Frequency filter is set to a low impedance in a VHF band to supply electric power to coiled antenna. With this arrangement, external whip antenna is excited in the UHF band or higher, and built-in coiled antenna is mainly excited in the VHF band. The antenna device is thus capable of sending or receiving radio waves in a wide frequency band.

Abstract: There is provided an antenna device for use with a portable terminal, which can be used in different frequency bands by combining antenna characteristics. Whip antenna is electrically connected to power feeder through contact member, and resonates in a UHF band or higher when extended. Coiled antenna is electrically connected to power feeder through frequency filter mounted on device board. Frequency filter is set to a low impedance in a VHF band to supply electric power to coiled antenna. With this arrangement, external whip antenna is excited in the UHF band or higher, and built-in coiled antenna is mainly excited in the VHF band. The antenna device is thus capable of sending or receiving radio waves in a wide frequency band.

Abstract: A radio communication device including: a case; a circuit board mounted inside the case; an antenna apparatus that is arranged inside the case and is fed electricity from the circuit board; and one or a plurality of antenna improving elements that are each arranged inside the case and each have a line section with one end grounded at one point to a ground of the circuit board and with another end open, in which the antenna improving element is arranged near a central portion of the case along a longitudinal direction thereof, and the antenna apparatus is arranged near an end of the case along the longitudinal direction thereof.

Abstract: Two antenna elements are planar and stored in a housing. An antenna element is arranged with the antenna faces of the antenna elements orthogonal to the plane of the substrate. The shape, interval, etc. of the antenna element depend on an available frequency. The length of an electric field vector generated between the substrate and the antenna element becomes longer as the antenna element is farther from the substrate. The frequency corresponding to the electric field vector changes corresponding to the radio signal frequency, that is, higher or lower. That is, in the above-mentioned antenna structure, the band of the frequency response is broader. Therefore, in the above-mentioned antenna structure, the frequency response band can be increase and space can be saved in storing an antenna in a housing using a simple structure in which the antenna face of an antenna element is arranged orthogonal to the plane of the substrate.

Abstract: There is provided a mobile wireless terminal permitting the distance between the antenna and the human head can be kept relatively constant even if the angle formed by the case of the apparatus is varied, making it possible to ensure stable antenna performance. A mobile wireless terminal according to the invention is fitted to an upper case and has an antenna extensible from the upper case and, when that antenna is stowed in the upper case 1, the upper end of the upper case protrudes farther than the position of an ½ length of a coil section, which is the tip section of an antenna element positioned at the tip section of the antenna.

Abstract: In a compound portable terminal which supports two communication standards using different frequencies when an antenna is prepared for each communication standard, radio interference occurs in two antennas, and there is a possibility that bit errors increase. To avoid this possibility, there is a problem that two antennas need to be separated from each other as far as possible. To solve this problem, two elements are disposed in the vicinity of each other, a feeding terminal and a ground terminal are disposed in one of the elements, and a ground terminal is disposed in the other element. The other element has no feeding element. When transmission is performed from the feeding terminal, an induced current is produced in the element having no feeding terminal, and each element is excited by individual resonance frequency, and operate as antennas.

Abstract: A mobile telephone that can suppress the deterioration of antenna characteristics caused by a conduction current. It comprises an inverse element 60 provided in a region where, looking from the side of an antenna 50, at least the antenna 50 and a conductive part 21 overlap, disposed between the antenna 50 and the conductive part 21 at prescribed, respective distances from the both, so as to guide a current flowing from the conductive part 21 to flow in the inverse direction to that in which the current flows in the conductive part 21.

Abstract: A cellular telephone set is capable of receiving a plurality of broadcast waves while efficiently covering wide bands such as FM and TV broadcasts and reducing mutual effects on radio circuits if the cellular telephone set has the additional function of receiving FM and TV broadcasts and the antenna of the cellular telephone set is used to share receipt of FM and TV broadcasts. The cellular telephone set has an antenna, a radio unit selector switch branching a line connected to the antenna into two lines that are connected respectively to a switch and a cellular telephone set radio unit, and a plurality of impedance adjusting circuits connected parallel to the switch and associated with the broadcast waves, respectively. The switch selects one of the impedance adjusting circuits which is associated with the broadcast wave that is being currently received.

Abstract: An antenna device disclosed herein is integrated with an earphone for generating sound from an ear receiver, and connected to a wireless equipment through a connector to transmit an audio signal applied from the wireless equipment to the connector through a plurality of earphone signal lines. An antenna element lies between the ear receiver and an intermediate position of an earphone signal line for transmitting the audio signal from the connector to the ear receiver. A branch is disposed at the intermediate position for preventing a high frequency signal on each of the plurality of earphone signal lines from passing therethrough, and for passing the audio signal therethrough to extract a signal received by the antenna element. A coaxial line transmits the signal received by the antenna element and extracted by the branch to the connector through a core line possessed thereby.

Abstract: An antenna device capable of being applied to a portable radio terminal and showing a good antenna characteristic regardless of the direction, and a portable radio terminal provided with the antenna device. The antenna device applied to a portable radio terminal whose housing length is equal to or more than ?/4 with respect to the wavelength ? of transmission-reception signals comprises an antenna element disposed on one end of the housing in the longitudinal direction in which at least one point of one end is connected to a signal wiring pattern on a substrate and the other end is an open end, and a parasitic element disposed on the same side of the housing as the antenna element in which one point of one end is connected to a ground wiring on the substrate and the other end is an open end, wherein the open end of the antenna element and the open end of the parasitic element are approximated to each other and capacity coupled.

Abstract: There is provided an antenna device for use with a portable terminal, which can be used in different frequency bands by combining antenna characteristics. Whip antenna 1 is electrically connected to power feeder 3 through contact member 5, and resonates in a UHF band or higher when extended. Coiled antenna 2 is electrically connected to power feeder 3 through frequency filter 4 mounted on device board 10. Frequency filter 4 is set to a low impedance in a VHF band to supply electric power to coiled antenna 2. With this arrangement, external whip antenna 1 is excited in the UHF band or higher, and built-in coiled antenna 2 is mainly excited in the VHF band. The antenna device is thus capable of sending or receiving radio waves in a wide frequency band.

Abstract: In a portable radio terminal unit, when a built-in antenna is provided, influence of user's body is to be reduced as small as possible to prevent deterioration of antenna characteristics. The built-in antenna is arranged in contact with a microphone unit positioned at lower portion of a unit casing. The microphone unit is mounted on a front casing forming the casing. Therefore, the built-in antenna is also mounted on the front casing. Thus, even during calling and browsing display, the built-in antenna may not contact with a user's head or may not be covered by the user's hand to reduce deterioration of the antenna characteristics for maintaining more stable communication characteristics.

Abstract: An enclosure part in the vicinity of a receiver part or an enclosure part to which a user brings its head close during a call is formed out of a nonconductive material of resin or the like, and an enclosure part being lower than the enclosure part of the nonconductive material has an electric conductor.

Abstract: An antenna apparatus comprise a main antenna line element (22) and a parasitic antenna line element (23) which are located above a conductive plate (21). A feeding terminal (24) is connected to a first end portion (221) of the main antenna line element (23). A second end portion (222) of the main antenna line element (23) comprises an open end. A grounding terminal (25) is connected to a third end portion of the parasitic antenna line element (23). A fourth end portion (232) comprises an open end. The first end portion (221) is close to the third end potion (233) and extend opposite directions. The second end portion (222) extend in the direction perpendicular to the first and the third end portions (221 and 231).

Abstract: A mobile telephone that can suppress the deterioration of antenna characteristics caused by a conduction current. It comprises an inverse element 60 provided in a region where, looking from the side of an antenna 50, at least the antenna 50 and a conductive part 21 overlap, disposed between the antenna 50 and the conductive part 21 at prescribed, respective distances from the both, so as to guide a current flowing from the conductive part 21 to flow in the inverse direction to that in which the current flows in the conductive part 21.

Abstract: An antenna in which a metal wire rod constituting an antenna element and a metal plate as an element to be linked to a feeding point can be securely connected with high electric and mechanical connection reliability and a radio communication terminal including this antenna. The metal wire rod includes an elastic part having shape elasticity and an antenna element having the desired antenna characteristics. The elastic part of the metal wire rod is press-held by bent parts of the metal plate to be shrunk in its radius direction, to accomplish a stable electric and mechanical connection between the metal wire rod and the metal plate.

Abstract: A radio communication device including: a case; a circuit board mounted inside the case; an antenna apparatus that is arranged inside the case and is fed electricity from the circuit board; and one or a plurality of antenna improving elements that are each arranged inside the case and each have a line section with one end grounded at one point to a ground of the circuit board and with another end open, in which the antenna improving element is arranged near a central portion of the case along a longitudinal direction thereof, and the antenna apparatus is arranged near an end of the case along the longitudinal direction thereof.