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: A rectangular substrate provided in a radio communication terminal includes a built-in antenna and a grounded conductor functioning as a current control conductor. The antenna is placed in the vicinity of one short side of the substrate, and the current control conductor is placed in a vicinity of the other short side of the substrate. When the substrate has, for example, a half wavelength, the current control conductor changes an effective length of the substrate to reduce a high-frequency induced current generated in the substrate. Therefore, the deterioration of the antenna characteristics influenced by the human body can be prevented. The invention is applicable to the radio communication terminal having two casings movably connected by a connector.

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: 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: 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: 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 diversity receiver includes a plurality of antennas, a receiving unit for receiving radio waves via the antennas, a phase adjuster disposed for each said antenna and connected thereto for adjusting a phase angle of a radio wave received by each of the antennas to a value to increase gain of each antenna to which the phase adjuster is not connected, and a switching unit, operative in response to a control signal indicating a selected antenna having a best reception state to receive an external radio wave, for connecting the selected antenna to the receiving unit, for disconnecting the selected antenna from the phase adjuster and non-selected antennas other than the selected antenna, and for connecting the non-selected antennas to the phase adjuster associated therewith. The phase adjuster is connected in a stage subsequent to the switching unit viewed from the antennas. This configuration provides a highly efficient diversity receiver.

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 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: A portable pen-based information terminal apparatus includes a housing which includes a display and input section, a pen storing section, a communicating section, and an antenna device. The communicating unit and the antenna device are integrally disposed in the housing. The apparatus further includes an input pen to be inserted in and to be removed from the pen storing section of the housing. The pen is capable of displaying items on the display and input section. The pen storing section is disposed in the antenna device. This resultantly minimizes the size, weight, and cost of the apparatus.

Abstract: A portable wireless terminal according to the present invention includes an external antenna provided outside a housing and an internal antenna having a rectangular solid-shape formed inside the housing into a rectangular solid shape. The internal antenna having a rectangular solid-shape is not affected by influences of human bodies such as the human head and the human hand, and is disposed in the vicinity of a microphone unit and is attached to a back surface of a front panel of the housing.

Abstract: A first and a second transmission antenna 2 and 3 are disposed in a lower and an upper part, respectively, of a housing 1. One of the two transmission antennas 2 and 3 is predetermined to be a normally used transmission antenna, in the neighborhood of which a sensor 8 is disposed. When the user's hand 4 covers the first transmission antenna 2, the control part 6 feeds out a control signal to the control part 6, whereupon an antenna select switch 7 automatically switches the first transmission antenna 2 over to the second transmission antenna 3.

Abstract: A portable pen-based information terminal apparatus includes a housing which includes a display and input section, a pen storing section, a communicating section, and an antenna device. The communicating unit and the antenna device are integrally disposed in the housing. The apparatus further includes an input pen to be insertably in and to be removed from the pen storing section of the housing. The pen is capable of displaying items on the display and input section. The pen storing section is disposed in the antenna device. This resultantly minimizes the size, weight, and cost of the apparatus.

Abstract: In a selective call receiver, a plurality of received messages are stored onto a message memory until the message memory is full. The received messages have designated degrees, respectively, which are each designated by instructions of a user. When a new received message is received, an earlier received message having the lowest designated degree is retrieved among the received messages stored in the memory and then the new received message is written over the earlier received message having the lowest designated degree.

Abstract: A diversity receiver includes a plurality of antennas, a receiving unit for receiving radio waves via the antennas, a phase adjuster disposed for each said antenna and connected thereto for adjusting a phase angle of a radio wave received by each of the antennas to a value to increase gain of each antenna to which the phase adjuster is not connected, and a switching unit, operative in response to a control signal indicating a selected antenna having a best reception state to receive an external radio wave, for connecting the selected antenna to the receiving unit, for disconnecting the selected antenna from the phase adjuster and non-selected antennas other than the selected antenna, and for connecting the non-selected antennas to the phase adjuster associated therewith. The phase adjuster is connected in a stage subsequent to the switching unit viewed from the antennas. This configuration provides a highly efficient diversity receiver.

Abstract: A portable compact radio terminal device includes a radio board to which a loop antenna is connected, and a control board having a display section and a battery and connected parallel to the radio board through a connector. At least one end of a parallel portion of the loop antenna is formed into an arcuated shape. The loop surface of the antenna is perpendicular to the radio board and the control board, and a gap is formed between the loop surface of the loop antenna and an end portion of the radio board.

Abstract: It is an object of the invention to allow a user to call a radio selective calling receiver (pager) near a room or house within a range of several hundred meters from a cordless telephone master or subsidiary unit without using a general public telephone line and without being charged for the call. The paging system includes a pager, and a cordless telephone master and subsidiary units capable of calling the pager.

Abstract: Digital amplitude values of multilevel signals of repeated transmissions are stored in respective locations of a memory which respectively correspond to the transmissions, and a set of amplitude values are simultaneously read from the memory locations and compared with decision threshold bands which respectively represent data symbols. A decision is made in favor of the data symbol of a decision threshold band if majority of the set of amplitude values are lying within the decision threshold band, or in favor of the data symbol of a decision threshold band if only one of the set of amplitude values is lying within or nearest to the decision threshold band and other amplitude values of the set are not nearer to any of the decision threshold bands than the only one amplitude value is near to the decision threshold band.