Abstract: A shielding housing for electrically shielding at least one component on a printed circuit board includes a layer of a non-shielding material having at least one cavity for receiving the component. An elastic gasket is provided on the rim of the cavity. A layer of an electrically shielding material covers the gasket as well as one or both surfaces of the layer of a non-shielding material. In operation, the shielding housing is pressed with its gasket against a conductor located on the printed circuit board around the component to be shielded.

Abstract: A highly sensitive communicator that disposes an IC serving as a high frequency noise generator to reduce the effect of the high-frequency noise. The active surfaces of a high-frequency analog IC and a signal-processing digital IC face toward a liquid crystal display panel disposed at the front of the communicator and do not face a loop antenna formed in a watchband at the rear. Therefore, even if the high-frequency analog IC and the signal-processing digital IC emit high-frequency noise from the active surfaces the high-frequency noise is unlikely to reach the loop antenna. Therefore, the communicator has high sensitivity.

Abstract: A carrier and shield arrangement, where the transceiver of a circuit board is exchangeable through the front panel of a station in the computer network. The shield physically connects to the carrier mounted on the circuit board, where the carrier receives the transceiver and electrically connects the transceiver to the circuitry on the circuit board. The shield has two walls, a cover and a panel portion which are formed of a material to block electromagnetic interference. The walls are electrically connectable to the circuit board, and a panel portion of the shield is electrically connectable to the carrier and to the front panel.

Abstract: Apparatus and method for reducing the interference of digital cellular telephones with hearing aids. A digital cellular phone is provided with a second antenna that transmits a local, low-power signal which fills in the gaps in the transmitted switched information carrier. This prevents the hearing aid from demodulating the low frequency switched carrier components of the digital cellular phone. Alternatively, the main antenna can transmit on a garbage frequency between time slots, or the hearing aid can detect and cancel the interfering signal.

Abstract: A tuner part of a digital satellite broadcasting receiver includes an IF signal demodulator part and an I/Q signal demodulator part. These demodulator parts are formed on different substrates, and covered with different chassis respectively. Low-pass filters are provided between an amplifier circuit of the IF signal demodulator part and an output terminal and between an IF signal input terminal of the I/Q signal demodulator part and a baseband converter circuit respectively. Further, an AGC detector circuit for detecting the level of an IF signal for the baseband converter circuit is provided for controlling the amplifier circuit of the IF signal demodulator part by its AGC voltage.

Abstract: A receiver includes a first case to which an integrated circuit controlling component of the receiver is mounted, and a second case pivotally mounted to the first case and having an antenna mounted thereto. The integrated circuit and the antenna are thus mounted in different cases so as to be separated from each other, and the receiver receives a radio wave with less noise from the integrated circuit. An LCD is mounted to one of the cases such that the LCD is interposed between the antenna and integrated circuit, to substantially shield the antenna from the integrated circuit, when the cases are closed together.

Abstract: The invention presents a housing for appliances in the field of electrical datacommunication which is protected from outside interference in that it is provided with a part (13, 15) shaped from metal plating on the inside which is fixedly connected to a layer of thermoplastic material which forms the outer shell (12, 14) of the housing.

Abstract: A liquid-crystal display for use in small-sized transceivers is provided. This display includes a signal processing circuit processing a radio signal received by an antenna, a liquid-crystal driver converting an output signal from the signal processing circuit into a display control signal, a liquid-crystal plate responsive to the display control signal from liquid-crystal driver to display information thereon carried by the radio signal, an electroluminescence plate disposed between the liquid-crystal plate and the liquid-crystal driver, illuminating a bottom area of the liquid-crystal plate opposite to the display area, and a conductive shield member attached to the bottom area of the electroluminescence plate, blocking conductive coupling of the liquid-crystal plate and the liquid-crystal driver for screening the antenna from noise interfering with radio reception.

Abstract: A shield including a cover and pins is inserted in a solder-free connection into an electronic substrate for shielding electronic components on the substrate in an electronic device. The shield has a conductive cover, preferably with an integrally formed roof and wall, which defines a cavity. The cavity is configured to receive an electronic component or components positioned therein. The shield also has a conductive mounting pins which extend from the cover. The cover and the pins are preferably formed as a single piece. The shield also preferably includes a conductive gasket connected in a groove in the cover between the cover and the electronic substrate. Methods of assembling the shield on an electronic substrate in forming an electronic package for an electronic device are also provided.

Abstract: In the present invention the cover-like part (21) of an RF shield is manufactured from a transparent material, e.g., plastic, and unplated areas that function as light conductors (22) are left in the conductive plating covering the shield. The present invention combines an RF shield and a light conductor into one structure whose manufacturing process is quite easy to control. The present invention eliminates the necessity of having separate plates that function as light conductors.

Abstract: An electromagnetic interference (EMI) shield for a handheld cellular phone that is particularly useful for shielding a hearing aid against EMI from the phone's antenna. The device includes a base and a flap laminated with a metallic shielding. The base attaches to the receiver end of the cellular phone and the flap rests over the base when the phone is not in use. In operation, the flap extends away from the base forming an enclosure about the user's ear for shielding the hearing aid from EMI when the phone is in use.

Abstract: A radiation shield for use with a mobile hand-held communication device, the communication device including a listening element and a stowable and deployable talking element, the radiation shield including a first shield portion which at least partially covers the talking element, a second shield portion which at least partially covers the listening element, a fastener which fastens the first and the second shield portions together, the first and the second shield portions and the talking element being in a stowed orientation when the first and the second shield portions are fastened together by the fastener, and a tensioning device operatively attached to at least one of the first and the second shield portions, wherein the tensioning device, upon opening of the fastener, applies a force to at least one of the first and the second shield portions which moves at least one of the first and the second shield portions into a deployed orientation.

Abstract: A radio pager for receiving a paging signal with a half-size microstrip antenna. A pair of electrical conductive elements sandwich a printed circuit board on which elements constituting pager circuitry are mounted. The conductive elements and conductive connecting pins fastening them constitute an electromagnetic shield case for the circuitry elements, reducing the radiation of unnecessary electromagnetic waves to the outside from the circuitry mounted on the printed circuit board, particularly a local oscillation circuit. Since the antenna has an earth plate thereof connected to one of the conductive plates with respect to high frequency, the conductive plate plays the role of an earth plate at the same time. As a result, a microstrip base plate is miniaturized while the space available for parts is increased.

Abstract: In a transceiver circuit module, a transmitting circuit section and a receiving circuit section are located on a board, and the transmitting circuit section and the receiving circuit section are electromagnetically isolated from each other by an electromagnetic shield wall.

Abstract: A radio module for a radio base station of a mobile radio system which transmits and receives radio signals from stationary or moving mobile radio stations over given frequencies. A module comprises an antenna part and a transceiver part of given mechanical construction. Each module of a base station transmits and receives over a given specific frequency which may be different when transmitting and receiving but which is not the same frequency as that used by any other module in the station. A radio base structure is comprised of a plurality of modules, each having its own specific or individual transmitting and receiving frequency and being provided with suppression means which prevent a module from disturbing neighboring modules. A radio base structure having diversity reception is also provided.

Abstract: An assembly and method of assembly for shielding a radio telephone. First and second shields are disposed either side of a circuit board and urged together thereby sandwiching the circuit board. The first shield is relatively rigid compared to the second shield and can cause any deformities in the second shield to be compensated for by the second shield being urged against a rigid first shield, the shields may be removably coupled together which permits simple and quick disassembly if changes or repairs need to be made to the radio telephone.

Abstract: The radio frequency (RF) shielding method uses RF shield clips. The RF shield clips have a base and two walls. The base is shaped to form two stabilizing legs for providing vertical stability. The two walls extend upward from the base, each wall has a portion flanged outward for accepting a portion of a RF shield. Each of the walls has multiple inwardly protruding domes for providing point contact to the RF shield.

Abstract: The antenna element mounting of the present invention enables an antenna to be mounted between the printed circuit boards of a radio instead of along side the boards. The shielding of the printed circuit boards has an indentation along one edge of each shield. When the shields are mated, the indentations form a channel into which the antenna is mounted.

Abstract: A portable radio communication device such as wristwatch receiver and/or transmitter is provided with an effective noise shielding structure. The portable radio communication device includes a high frequency analog circuitry for receiving and transmitting radio signals and further includes digital circuitry for data processing and display. The noise shielding structure protects high frequency noise from being transmitted to the analog circuitry from the digital circuitry and from other outside sources. The noise shielding structure is made of electrically conductive material. In another aspect of the invention, at least one circuit board constructed of a multi-layered construction having at least one inner printed wire pattern is provided. The inner printed wire pattern is set at ground potential with respect to the high frequency output from the analog circuitry. In this manner the inner printed wire pattern serves as a noise shielding member.

Abstract: An electronic device (10) having a shielded housing (20) with an integrated light pipe (19 & 21) includes a substantially clear housing, a portion of which is arranged and constructed to form the integrated light pipe and plating (23), selectively applied to the substantially clear housing, to provide for effective electromagnetic interference shielding and to allow for sufficient light into the integrated light pipe.

Abstract: A control signal transmitting device is used for a control device, such as a position detecting device. The transmitting device includes a position detecting sensor, and a receiving device situated near the position detecting sensor. The position detecting sensor includes a sensing device, a radio wave transmitting device electrically connected to the sensing device, and a device for directing the radio wave in one direction. The radio wave transmitting device emits radio wave in a direction opposite the sensing device upon receiving a signal from the sensing device. The receiving device includes a radio wave receiving device disposed to face the radio wave transmitting device for receiving the radio wave transmitted from the transmitting device, and a shielding device for covering the receiving device to receive the radio wave from one direction.

Abstract: As for an electric apparatus having a case formed of electro-magnetic wave passing-through material, in order to provide an electro-magnetic wave shielding structure being capable to effectively prevent the leakage therefrom of an electro-magnetic wave generated therein, an electro-magnetic wave reflecting layer, namely, a conductive layer is formed on an inner face of the case and further, on a surface of the conductive layer, a magnetically losing layer containing Mn--Mg--Zn group soft ferrite particles having 1 to 20 .mu.m average diameter by 70 to 90 weight % at a thickness exceeding 80 .mu.m is formed, so as to repeatedly absorb the inner generated undesired electro-magnetic wave therein through repeated reflection between the conductive layer and the absorbing layer.

Abstract: A first responder for transmitting an identification signal in response to a microwave interrogation signal comprises an electric power receiving circuit for receiving the interrogation signal to produce a dc power, having a microstrip line antenna having a trapezoid shape whose upside has a width from 1/2 to 1/4 of a wavelength, and a rectifying circuit. The rectifying circuit may be modified. A second responder comprises an electric power receiving circuit having a microstrip line antenna from the received microwave signal, a power supplying circuit for supplying a dc power in the vertical and horizontal positions of the responder against a polarizing plane of the microwave signal, an identification signal generation circuit for transmitting an identification signal through the antenna with given polarization plane by detecting the responder attitude.

Abstract: A portable radio and telephone equipment for transmitting and receiving an electric wave. The portable radio and telephone equipment includes: an antenna for transmitting and receiving an electromagnetic wave; a housing connected to the antenna, having a notch therein; and an internal circuit, connected to the antenna by way of the housing, for generating and receiving the electromagnetic wave. The portable radio and telephone equipment includes: an antenna for transmitting and receiving an electromagnetic wave; an upper portion of a housing connected to the antenna; and a lower portion of a housing connected to the upper portion of the housing via a conductor wire, so that the housing is divided into two portions in order to vary distribution pattern of the electromagnetic wave.

Abstract: A face plate with an elastomeric, electrically-conductive gasket to provide electromagnetic radiation and control air flow for a front panel of an electronic equipment frame. The metallic face plate has a plurality of edge surfaces which are capable of providing electrically conductive contact with the frame wherein one of the edge surfaces has the gasket. The gasket is an electrically-conductive contact with the face plate and an adjacent face plate which forms a thermal seal and an electrically-conductive surface.

Abstract: Protection means (6, 18) are associated with the radiating system (16) of a transmitter constituting a radiotelephone (4). The purpose of the protection means is to reduce the amount of radiation that is intercepted, i.e. the proportion of the emitted radiation (20) that is intercepted by the body of the user (2), so as to enable the overall power of the radiation to be increased. In accordance with the invention, said protection means include a casing (18) ensuring that safe distances (33, 34, 35) are maintained between the radiating system and the body of the user. The protection means further include a screen (6) that absorbs the radiation. The invention applies in particular to long-range radiotelephones.

Abstract: In a tuner for converting antenna input signal into audio signals, tuner circuit components are mounted on a tuner circuit substrate. Of the tuner circuit components, FM wave front end circuit components constituting a high-frequency amplifying circuit, a mixing circuit and a local oscillating circuit are surrounded by a shield case. An antenna jack including an earth tube and a signal terminal insulated from the earth tube is mounted on the tuner circuit substrate. The signal terminal of the antenna jack is connected to an antenna input signal pattern of the tuner circuit substrate. The earth tube of the antenna jack is forced in and supported by a jack attachment plate that is an extension of the shield case.

Abstract: Microwave circuits, namely the circuits relating to the transmission-reception part and to the filtering of the microwave transceiver, are mounted on one and the same multilayer printed circuit and their electromagnetic insulation comprises, firstly, elements of the printed circuit such as conductive tracks on one of the faces of the printed circuit, metallized holes drilled in the tracks and close to one another so as to fulfil the role of an electromagnetic barrier and, at least in the case of some of them, a conductive plate and, secondly, attached elements with, especially, a thick metal lattice surmounted by a lid, the lattice resting on the conductive tracks.

Abstract: The present invention provides a shield structure for shielding a microwave circuit device, which can establish a reliable electric contact between the ground wiring patterns of a circuit substrate, and can completely prevent external noise from entering into the circuit, with the use of a light and compact shield case. A circuit substrate has microwave components mounted thereon, ground patterns formed on peripheral portions of the upper surface of the substrate, and a ground pattern formed in the lower surface of the substrate along the entire periphery thereof. A shield case main body receiving the circuit substrate comprises a case main body, a top plate, and a bottom plate. The thickness of the case main body increases from a predetermined position such that it contacts the ground patterns. The bottom plate is coupled integral with the case main body with the circuit substrate interposed therebetween, in a state where the circuit substrate is received in the body.

Abstract: A portable radio communication apparatus includes a printed circuit board, an antenna section and a radio section installed on the board, a housing, and a connector. The radio section includes electronic parts of which connecting terminals are connected to the printed circuit board and of which conductor sections formed on outer surface thereof are connected to the grounding section. The housing accommodates therein the printed circuit board, the antenna section, and the radio section. The housing has a conductor film formed on an inner surface thereof. The conductor sections of the electronic parts are connected to the conductor film on the inner surface of the housing via the connector. Since the shielding case and the connector conventionally used are unnecessary, the size and weight of the apparatus can be reduced.

Abstract: A direct conversion receiver for providing a direct conversion of a radio frequency signal having a carrier frequency comprises a local oscillator for substantially equal frequency to the carrier, and a semiconductor integrated circuit mounting mixers and amplifiers for amplifying inputs to the mixer. The amplifiers amplify the local oscillation signals and/or radio frequency signal inputted from the outside of the semiconductor integrated circuit and supply the amplified signals to the mixers. The mixers mix these inputted signals and output the mixed signals to the outside of the semiconductor integrated circuit. By thus forming the receiver, radiation of the local oscillation signals to outside of the receiver and leakage inside thereof can be suppressed.

Abstract: The drive-up station full duplex communication system is adapted for use in a building having a drive-up vehicle lane at the outside thereof, and having a customer speaker post at the lane for enabling a customer to communicate verbally with personnel within the building to enter into a transaction. A transceiver used by personnel to communicate with a customer via a base station, is disposed within the building includes a device for attenuating a received audio signal when an outgoing audio signal is being transmitted. A customer speaker post at the drive-up station includes a device for similarly attenuating the incoming audio signal when an audio signal is being transmitted to the transceiver unit disposed within the building. Full duplex communication is achieved while substantially decreasing or eliminating unwanted feedback interference at both units.

Abstract: The invention is directed to a wristwatch type paging device having a structure for preventing the intrusion of static electricity. The paging device is provided for receiving or transmitting signals. A pager circuit is provided for controlling and operating on the received or signals to be transmitted. A pager body, having a two part wrist band coupled thereto, houses the pager circuit. The body is formed with at least a conductive portion. The band fastens around the wrist of the user and carries antenna portions. A fastener mechanically couples the end portions and electronically couples the antenna portions. The conductive portion of the pager body is set to the AC ground potential (the potential of one of the positive or negative electrodes of the battery). A balanced varactor diode circuit is provided between the antenna portion ends defining an essentially neutral point coupled to one of its positive and negative electrodes.

Abstract: A portable radio communication device such as wristwatch receiver and/or transmitter is provided with an effective noise shielding structure. The portable radio communication device includes a high frequency analog circuitry for receiving and transmitting radio signals and further includes digital circuitry for data processing and display. The noise shielding structure protects high frequency noise from being transmitted to the analog circuitry from the digital circuitry and from other outside sources. The noise shielding structure is made of electrically conductive material. In another aspect of the invention, at least one circuit board constructed of a multi-layered construction having at least one inner printed wire pattern is provided. The inner printed wire pattern is set at ground potential with respect to the high frequency output from the analog circuitry. In this manner the inner printed wire pattern serves as a noise shielding member.

Abstract: An electromagnetic shielding structure of high-frequency circuit arrangements which is capable of electromagnetically shielding each high-frequency functional circuit within a narrow space. A printed-circuit board mounted with a plurality of high-frequency functional circuits is installed in the shielding case. Ribs with a long groove are formed on the inside surface of a molded plastic casing which has been treated to provide electrical conductivity, for separating the high-frequency functional circuits mounted on the printed-circuit board. In the long groove of the ribs is pressed a shielding member, and with the printed-circuit board assembled between the shielding case and the molded plastic casing, the top end of the shielding member is pressed against a ground pattern of the printed-circuit board.

Abstract: An aperture covering, such as a window shade, comprises a shade body (10), a shielding member (24) provided on a shade-body periphery facing a window frame (2), and a shade-body winding mechanism (6). The shielding member (24) is conductive and contacts the window frame (2) to close the space between the shade body (10) and the window frame (2). When the winding mechanism (6) winds the shade body (10) down to cover the window frame (2) with the shade body (10), the window shade blocks electromagnetic energy inside and outside a building, while regulating light entering the building through a window.

Abstract: A semiconductor integrated circuit for a radio comprises: a front end circuit block (1) including at least an oscillation circuit (1b) and a mixing circuit (1c), for converting an RF signal to an IF signal; and an IF amplifying circuit block (2) for amplifying the IF signal and limiting an amplitude thereof, and the front end circuit block (1) is covered with shield electrodes (17, 17a, 17b, 17c) connected to a predetermined potential.

Abstract: A signal receiver with a cabinet and mono-pole antenna mounted outside of the cabinet with a signal receiving apparatus mounted inside of the cabinet. A shielded conductor is mounted inside of the cabinet as another antenna to be used with the mono-pole antenna. A balun which has first and second input terminals and an output terminal, and the first and second input terminals of the balun are connected to the mono-pole antenna and to the shield conductor and the output terminal is connected to the signal receiving apparatus.

Abstract: A microwave converter comprises circuit components formed on the outer surfaces of a three-dimensional body. The inner surfaces of the body constitute a grounding surface. A local oscillator is disposed on one of the inner surfaces. The three-dimensional body may be an electrically conductive body having a hollow space in which the local oscillator is disposed.

Abstract: A structure for wireless communication in an electromagnetically shielded building has an outer wall made of an electromagnetically shielding material such as concrete or an electrically conductive material. The outer wall has a window composed of a glass pane with an electromagnetically shielding material coated thereon or mixed therein. The outer wall and the window are grounded, and jointly define an electromagnetically shielded space in which wireless transmission/reception devices are disposed. Wireless communication is effected between the wireless transmission/reception devices by radio waves in a selected frequency range and of a selected power output.

Abstract: A miniature shield with opposing cantilever spring fingers is disclosed. Shield walls, which may be part of a housing for electronic equipment, are designed to insert between a plurality of opposing cantilever spring fingers arranged in a "U"-shaped channel. Torque generated at the bottom of the "U"-shaped channel is minimized by the opposing cantilever spring fingers and enables the channel to be reflow soldered to an electronic circuit board.

Abstract: A programmable signal receiver for use in a computer system. The signal receiver is located inside the computer's chassis and has an interface directly coupled to the computer's bus for receiving instruction signals which specify one or more channels to be selected from a broadband input signal. Each selected channel of the broadband signal is amplified using amplifying circuitry of sufficiently low impedance that the RF radiation produced does not interfere with the operation of the computer system. In one embodiment the signal receiver's input port is d.c. coupled to the computer's d.c. power supply so that the computer's d.c. power supply can be used to provide power to apparatus external to said computer system--such as a satellite dish's feed horn.

Abstract: In a tuning circuit for AM receiver, tuning coils, oscillation coils and capacitance elements of an antenna tuning circuit, a radio frequency amplifier circuit, and a local oscillator circuit are accommodated in discrete shield casings for high frequency coils; and the discrete shield casings are disposed in a row and united with each other in the form of blocks, thereby eliminating the necessity to effect tracking adjustment.

Abstract: A metal shield is dimensioned to enclose a portion of a portable radio having an internal antenna and a first transmission line. A transmission line mounted in the shield is positioned to be adjacent to the first transmission line when the shield engages the radio and permits energy to be coupled between the resonator and the first transmission line. The first transmission line and the shield are dimensioned so that the electrical length of the first transmission line increases to 2L when the shield engages the radio, where L is the electrical length of the first transmission line when the shield does not engage the radio. This electrical length transformation by an integral multiple of one half wavelength helps to maintain the input impedance to the internal antenna.

Abstract: In a microwave receiving apparatus using a waveguide filter, the waveguide filter is disposed in parallel to a microwave reception circuit board mounted in a shield container.

Abstract: The invention relates to molded pieces of plastic having at least a partial metal coating of their surfaces. The surfaces to be coated are roughened up by means of suitable pretreatment so that a good adhesion of the metal coating on the molded pieces is provided. For the support of this metal coating additionally a cover layer is applied. The molded pieces can also consist of shrinkable material which e.g. are also designed in the form of enveloping objects such as cable fittings.

Abstract: In furnishing an RF modulator with a reference signal generator for generating a specified test signal, and a switching circuit for switching a video signal and the test signal on occasion; the reference signal generator and the switching circuit are received in a shield case of the RF modulator, thereby to prevent radiated interferences.

Abstract: An RF gasket for reducing the flow of energy in the interface area between two conductive surfaces includes a plurality of stub pairs. These stub-pairs are dimensioned to form sub-groups of low impedance paths between the two conductive surfaces with each sub-group being effective in a different frequency sub-band of a large frequency range. The low impedance paths are established without the use of direct current connections between the two conductive surfaces. Such a gasket provides a broadband, non-contacting RF shield in the interface area between the two conductive surfaces.

Abstract: A thin metal RFI (radio frequency interference) shield for an IR (infra-red) input circuit including an IR transducer for a remote control receiver has slot-like apertures with louver-like members formed by twisting the metal between the slot-like apertures substantially 90.degree. with respect to the surface of the housing. The louvers compensate for the absence of shielding material in the apertures and thereby improve the RFI shielding effectiveness of the shield. The louver-like members also have been found to expand the field of reception or field of the remote control receiver by reflecting IR radiation coming from sideward positions into the IR transducer.