Abstract: The proper function of a smoke detector of an enclosed space, such as a toilet or freight space or crew quarters in an aircraft, is monitored by at least two air pressure sensors which are so positioned that these air pressure sensors can measure an air pressure differential in the air flow into the smoke detector. If a pressure differential is detected the differential is evaluated in a central processing unit which produces a respective signal that indicates that the air flow and thus the smoke flow into the smoke detector is obstructed, whereby the smoke detector cannot function properly. This signal is visibly or audibly indicated.

Abstract: The invention concerns a method for generating an alarm signal in a motor which comprises a rotor (50) whose actual rotation speed during operation lies in a normal zone (nSoll, TSoll), can deviate from that normal zone in the event of a fault, and is to be monitored for a fault state, comprising the following steps: At least one alarm switch-on rotation speed (naOn, TAOn) and at least one alarm switch-off rotation speed (nAOff, TAOff) are defined, of which the latter is located closer to the normal zone than the former, an associated pair of alarm switch-on rotation speed and alarm switch-off rotation speed defining between them a hysteresis zone. When the rotation speed to be monitored arrives, coming from the hysteresis zone, at the alarm switch-on rotation speed, an alarm switch-on criterion (Flag DIR=0) is generated. The duration of this alarm switch-on criterion is monitored. When this duration reaches a predetermined value (tdOn), an alarm signal (ALARM) is activated (FIG. 13: S186, S194).

Abstract: A system that detects cellular telephone and other electronic use within an unauthorized locations. The location can be detected by GPS or triangulation, and once detected can automatically produce certain operations.

Abstract: A method of transmitting information between a salt-cavern and the surface of the ground, the cavern being drilled in geological formation beds and being connected to the surface via an access borehole cased at least in part by metal tubes and presenting at least one safety valve, the method consisting in suspending a string of tools from a hanger system positioned in the access borehole downstream from the safety valve and in electrical contact with the metal tubes, the string of tools including at least one measuring device connected to the hanger system via a first segment of conductor cable and an information transceiver operating by means of waves and connected to the measuring device via a second segment of conductor cable, the transceiver being positioned in such a manner as to be in contact with structural means linked to the cavern; and establishing coupling between the transceiver and the structural means, in order to enable information to be transmitted between the measuring device and the surface

Abstract: A device, system, and methods of use for wireless transmission of a detected parameter obtained from inside a wellbore is disclosed. The wireless device comprises an acoustic wireless transceiver and a selectively expandable acoustic coupler operatively in communication with the acoustic wireless transceiver, the acoustic coupler adapted to physically couple the acoustic wireless transceiver with an interior of a tubular and acoustically transmit and/or receive data. The wireless monitoring device is deployed through a tubular to a predetermined position within the tubular, a predetermined portion physically coupled to the tubular once the monitoring device reaches the predetermined position, and data transmission acoustically coupled between the monitoring device and a remote receiver through the tubular.

Abstract: A robust transmission element for transmitting information between downhole tools, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between drill string components. A transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe. The transmission element may include an annular housing forming a trough, an electrical conductor disposed within the trough, and an MCEI material disposed between the annular housing and the electrical conductor.

Abstract: A system can be used with an existing meter that has a removable cover and a base and measures the usage of a utility commodity, such as electricity. The system replaces the removable cover with a replacement cover that fits onto the base in the same manner as the removable cover. The system has a usage reader inside the replacement cover that obtains information on the amount of the utility commodity that is used. No electrical or mechanical connection between the usage reader and the meter is made to obtain that information. An automatic meter reader, which includes a microprocessor for storing information and calculating charges and a transmitter for transmitting information to a remote receiver and a way to transfer information from the usage reader to the automatic meter reader is also part of the system.

Abstract: An alert transceiver in commuter vehicles in a line-of-site warning area receive line of sight (LOS) alert signals from another vehicle, such as an emergency vehicle. Upon detecting the LOS alert signal, the alert transceiver can relay the alert signals to other alert transceivers in commuter vehicles within a warning zone that are outside of LOS zone, thereby creating mobile tracking network (MTN). The alert signals can include any relevant information, such as information regarding a hazard that includes the type of hazard (emergency vehicle, fire, ambulance, etc.), the time stamped location, direction of travel, speed and planned route for the emergency vehicle; and/or the coordinates of warning zone as determined by alert transceivers.

Abstract: A system and method for advanced warning of severe weather for general aviation aircraft is presented. An aircraft includes an onboard weather tracker which monitors atmospheric condition changes. The weather tracker uses data from an onboard barometric altimeter and a GPS device to calculate air pressure changes in order to identify when the aircraft is flying into a low-pressure zone. The weather tracker uses the air pressure's rate of change and the aircraft's speed to determine the criticality of a situation and appropriately notifies a pilot. The weather tracker provides the pilot with local airport information and alternative flight pattern information per the pilot's request.

Abstract: A mobile location reporting communication system consists of a network of communication sources and targets managed by one or more control stations. In the system, a communication source may request for the location of a mobile communication target from the network. The target conveys its location to the network and that information is provided to the source. In the invention a mobile communication source request for the location of mobile communication targets that are present in a prescribed geographic boundary The network provides to the source only remote targets that are present in the prescribed boundary. Also in the invention, a concealed or clandestine mobile portable target, close to the mobile portable source, may be tracking the source. The source may invoke a method that may the result of mobile targets that have traveled a pre-specified distance with the source while maintaining proximity to the source.

Abstract: The invention provides real time information on the flow of vehicles on all roads within territorial boundaries, utilizing GPS enabled cell phones or similar mobile devices as traffic probes. The resulting information is submitted to subscribers, as described infra, and used in multiple applications including, but not limited to, real time vehicle routing; emergency vehicle routing; roadside emergency services requirements indication; traffic management; public agency notification of reduced vehicle flow on roadways; and real time as well as historical flow patterns to agencies responsible for maintaining or designing roads for optimum traffic flow.

Abstract: There is provided a multirotation type encoder which is small-sized, having nomechanical contact portion other than a bearing, having high reliability and long life and dispensing with interchange of a battery.

Abstract: The keypad interface element of this invention uses a relaxation oscillator and a digital keypad processor having a counter/timer to decode specific keys. The RC portion of the relaxation oscillator includes a resistance ladder and a set of momentary on pushbutton switches disposed change resistance dependent upon which key is pressed. This causes the relaxation oscillator to produce an output signal having a corresponding frequency. The counter/timer of the digital keypad processor produces a count corresponding to the oscillator frequency. The digital keypad processor latches and holds a binary number specifically identifying the depressed key. A state machine in the digital keypad processor provides transient-free, noise immune keypad decoding.

Abstract: The present invention uniquely separates the number pad from a keyboard providing a separate, wireless device. This separate wireless device with the number pad includes a display and has multiple modes of operation.

Abstract: A method of and device for performing a data expansion operation on a plurality of input data objects to generate expanded output data objects is disclosed. The method comprises receiving and decoding a data manipulation instruction defining a data expansion operation, a portion of the data manipulation instruction indicating an expansion operation from a number of predetermined types of data manipulation operations. The method includes generating one or more expansion objects responsive to the indication of an expansion operation, said expansion objects being for use in extending an input data object. The input data objects are manipulated according to control information expansion objects programmed to produce a set of expanded output data objects.

Abstract: A method and structure stores and/or transmits and receives data in compressed form. Retrieval latencies are reduced by selectively transmitting a portion of the data in uncompressed form. When the apparatus is part of a computer architecture supporting main memory compression, a selected L2 cache line belonging to the unit of main memory compression is kept uncompressed. To minimize decompression latency, the uncompressed L2 cache line is stored with the compressed-memory directory. Alternatively, the uncompressed L2 cache line is stored in the compressed memory together with the rest of the memory compression unit it belongs to.

Abstract: Capacitor calibration in SAR converter. A method for calibrating a switched capacitor array in a SAR data converter is disclosed, which array includes a plurality of primary capacitors having a common node plate interfaced to a common node and a switched plate interfaced to a switch that is operable to be switched between first and second reference voltages. A comparator having an input connected to the common node and a reference input connected to a comparator reference node receives a comparator reference voltage. In a first calibration step for calibrating one of the primary capacitors, a reference capacitor is provided and then, the switched plate of the select primary capacitor is connected to the first reference voltage, the switched plate of the other capacitors and the reference capacitor are connected to the second reference voltage, and the common node and the comparator reference node are driven with a driver to dispose a first voltage thereon.

Abstract: The variable gain analog-to-digital conversion device (1) for an image sensor comprises at least one N-bit non-linear coarse first converter (21) receiving a pixel voltage signal (Vpix) and at least one M-bit linear fine second converter (22) connected to the first converter (21) in order for the device to supply a binary word of N+M bits relating to the voltage level of the pixel. The first converter (21) comprises comparison means (33) for comparing the voltage level of the pixel with one or more voltage thresholds (V0 to V4) delimiting voltage ranges within the voltage dynamic range of the sensor. The successive voltage ranges represent areas of illumination of the pixel ranging from a weakly lit area to a strongly lit area. The first comparator supplies an N-bit binary word relating to the area of illumination determined for the pixel.

Abstract: A digital to analog converter (DAC) converts a plurality of digital input data into a plurality of analog output signals. The DAC includes an element pool having a plurality of elements, a random number generator for converting the digital input data into a set of control signals, a plurality of summing nodes for generating analog output signals, and a plurality of switches for connecting the elements to the summing nodes. The switches are controlled by the control signals. Because of the control of the random number generator, the element signals transferring to the summing nodes can be used alternatively and simultaneously.

Abstract: The invention is based on the object of specifying a controllable resistor network which exhibits a wide dynamic range and at the same time only a small relative resistance increment size.

Abstract: The invention relates to an analog input (40) for electronic circuit, which input is intended to be connected to an electrical output of a sensor (44) for measuring a physical parameter, the sensor being supplied with a supply voltage Vcc and providing at its electrical output an analog voltage Vs dependent on the parameter to be measured, the analog input comprising at least one analog/digital converter (46, 48) of resolution RN, characterized in that it comprises a computer (64) controlling the analog/digital converter so as to perform an analog/digital conversion of the supply voltage Vcc, the analog/digital converter providing the computer with a digital value Rsupp of the supply voltage Vcc of the sensor, an analog/digital conversion of the analog voltage Vs of the parameter to be measured, the analog/digital converter providing the computer with a digital value r of the analog voltage Vs to be measured, and the computer providing a digital value Vn of the parameter to be measured such that:

Abstract: High speed comparator for a SAR converter with resistor loading and resistor bias to control common mode bias. A differential comparator having positive and negative inputs and positive and negative outputs is disclosed. The comparator includes a current source for driving current from a supply to a common node. A differential pair of transistors is disposed such that one side of the source/drain paths are tied together and to the common node, with the other side of the source/drain paths thereof for each of the transistors in the differential pair interfaced to the positive and negative outputs, respectively for applying drive thereto. A first resistor load is disposed between the positive output and a supply reference opposite in polarity to the supply. A second resistor is disposed between the negative output and the supply reference.

Abstract: Open loop common mode driver for switched capacitor input to SAR. A method for controlling the operation of a SAR conversion cycle. The method includes the steps of first initiating the SAR conversion cycle by connecting one side of a plurality of capacitors in a capacitor array to a first capacitor reference voltage and the other side of the plurality of capacitors to the input of a comparator. This is followed by the step of sequentially switching in a plurality of compare cycles the one side of a select one or ones of the capacitors to a second capacitor reference voltage to change the voltage on the input of the comparator. Then, a compare operation is initiated after initiation of each compare cycle to compare the value on the input of the comparator with a compare reference voltage after a predetermined settling time has elapsed from the beginning of the initiation of each compare cycle.

Abstract: Self calibrating SAR analog-to-digital converter. A data converter for converting analog data on a differential data input having a positive analog input terminal and a negative analog input terminal to digital data. The data converter includes a first single ended successive approximation register (SAR) analog-to-digital converter for converting the analog signal on the positive analog input terminal to a first digital signal and a second single ended successive approximation register (SAR) analog-to-digital converter for converting the analog signal on the negative analog input terminal to a second digital signal. A circuit for combining the first and second digital signals as a digital output signal for the data converter that represents the difference between the analog signals on the positive and negative analog input terminals.

Abstract: Open loop common mode driver for switched capacitor input to SAR. A unity gain driver amplifier is disclosed for driving an output node that is connected to a capacitive load. The amplifier includes a first stage amplifier for driving an intermediate node, a positive voltage input node for being connected to an input voltage and a negative input node for receiving a feedback signal. A complimentary output stage is provided having an input connected to the intermediate node and an output connected to the output node, a voltage representative of the voltage on the output node fed back to the negative input of said first stage amplifier. Isolation circuitry then isolates the output node from the negative input node of the first stage amplifier as to phase shift due to large values of the capacitive loading during operation of the driver amplifier.

Abstract: Open loop common mode driver for switched capacitor input to SAR. A method for selectively switching capacitors in a SAR capacitor array that have a common plate thereof interfaced to the input of a comparator. The method includes the step of first initiating a SAR compare cycle. Then the other plates the capacitors switched such that they are disposed at either a first capacitor reference voltage or a second capacitor reference voltage in a combination and sequence of switching operations defined by a successive approximation search algorithm. Each switching operation in the sequence requires, after the step of switching, a comparison of the voltage input to the comparator with a compare reference voltage after a predetermined settling time from the time the capacitor combination for the switching operation has been switched. The duration of the settling time is controlled for each of the switching operations in the sequence such that at least two of the durations are different.

Abstract: Noise cancellation in a single ended SAR converter. A single ended SAR converter front end is disclosed with common mode driver noise cancellation. The SAR converter front end includes a differential amplifier having positive and negative inputs and an output. A switched capacitor array is provided that is operable in a SAR data conversion operation to vary the voltage on one of the positive or negative inputs of the differential amplifier. A common mode driver drives a common mode node with a low impedance common mode voltage signal to a common mode node, and switching circuitry then switches the common mode voltage signal on the common mode node to the positive and negative inputs of the differential amplifier during a portion of a SAR data conversion cycle.

Abstract: Common centroid layout for parallel resistors in an amplifier with matched AC performance. An amplifier is disclosed that is formed on a silicon substrate that includes first and second differential legs, each driving first and second resistive loads. The first resistive load comprises first and second parallel resistive loads connected on one side thereof to one end of the first differential leg and the other side of each of the first and second parallel resistive loads separately connected to a first reference voltage. The second resistive load comprises third and fourth resistive loads each connected on one side thereof to one end of the second differential leg and the other side of each of the third and fourth parallel resistive loads connected separately to the first reference voltage. Each of the first, second, third and fourth resistive loads is fabricated of a strip of resistive material disposed on the surface of the substrate and having a finite resistivity, length, width and thickness.

Abstract: A system which can be configured to communicate command codes to one or more home appliances which includes a keypad and a relay unit. At least one key on the keypad is associated with at least one command code from a plurality of command codes stored in a memory. The system determines if the at least one key on the keypad has been activated or if a command signal transmission that identifies the at least one key on the keypad has been received from the relay unit. When it is determined that either the at least one key has been activated or the command signal transmission that identifies the at least one key has been received, the system communicates to the one or more of home appliances the one or more command codes that have been associated to the at least one key on the keypad.

Abstract: “Actual correlation data” is stored at storage means 38A. Such “actual correlation data” is data representation(s) of correlation(s) between or among distance(s) to object(s) intended to be detected and phase difference(s) of respective reflected wave(s) established with due consideration having been given to reflection of microwave(s) by object(s) (ceiling surface(s), wall surface(s), floor surface(s), etc.) other than object(s) intended to be detected which may be present within area(s) intended to be protected. Distance(s) to object(s) intended to be detected is or are measured, based on such “actual correlation data,” from phase difference(s) of respective reflected wave(s) that has or have been detected.

Abstract: An average power value of a peak pair corresponding to a subjective target objective is converted into a radar cross section, to calculate a normalized average power value NP and a standard deviation DP representing a temporal dispersion of a power difference between peak pairs. When the value NP is larger than an automotive vehicle discriminating threshold THnp, the attribute of the subjective target objective is set to “automotive vehicle.” When the value NP is not larger than the threshold THnp and the deviation DP is larger than a human objective discriminating threshold THdp, the attribute of the subjective target objective is set to “non-vehicle objective: human objective.” Furthermore, when the value NP is not larger than the threshold THnp and the deviation DP is not larger than the threshold THdp, the attribute of the subjective target objective is set to “non-vehicle objective: non-human.

Abstract: The present invention relates to a radar device for forming multi-beams in multiple channels from reflected waves of a transmitted wave by using a minimum number of antennas. The device has: antennas used for both transmission and reception A1-A4; transmission/reception switching means 5 of each antenna; a transmitter 2; and a receiver 4 for receiving the reflected waves of the transmitted wave. The ratio of the distance between adjacent antennas A1 and A2 to the distance between adjacent antennas A2 and A3 or A3 and A4 is 1:2. The transmitted signal is transmitted from each of the antennas selected sequentially and the received signal is processed by DBF in a signal processing controller 1, wherein eleven channels can be implemented by using four antennas and a space for six antennas.

Abstract: A target determination apparatus for determining type of a target, includes a transmission unit, a reception unit, and a determination unit. The transmission unit emits an electromagnetic wave. The reception unit receives the electromagnetic wave reflected at the target to obtain reception information. The determination unit determines the type of the target on the basis of radar cross section obtained from the reception information.

Abstract: A radar detection process includes computing a derivative of an FFT output signal to detect an object within a specified detection zone. In one embodiment, a zero crossing in the second derivative of the FFT output signal indicates the presence of an object. The range of the object is determined as a function of the frequency at which the zero crossing occurs. Also described is a detection table containing indicators of the presence or absence of an object within a respective radar beam and processing cycle. At least two such indicators are combined in order to detect the presence of an object within the detection zone.

Abstract: A method of factory calibrating a police radar/laser detector including a controller, an accelerometer, and a memory, by manipulating the detector to rotate the accelerometer, measuring and feeding real time measurements from the accelerometer to a Least Squares Elliptical Fit algorithm executed by the controller, applying the Least Squares Elliptical Fit algorithm to the real time measurements to find the equation of an ellipse formed by the measurements, storing the coefficients of the ellipse in the memory. The coefficients are then recalled from the memory to thereby calibrate the accelerometer.

Abstract: A vehicle-installed radar sensor system includes a transmission section, a reception section, and a shield member. The transmission section is disposed in a closed space formed between a permeable member provided in a vehicle and a vehicle body, and transmits a radar wave to outside of the vehicle through the permeable member. The reception section is disposed in the closed space at a distance from the transmission section, and receives a reflected wave by a target through the permeable member. The shield member is disposed in at least one of the transmission section and the reception section, and suppresses at least one of occurrence of a reflected wave by the permeable member and reception of the reflected wave by the permeable member.

Abstract: The method of the invention, which is applicable, in particular, to making positioning signals from GPS and SBAS satellites reliable, consists in performing an instantaneous statistical analysis (of around 1 mn duration) of the correlation peak from the satellite signal receiver and in comparing it to a long-term (several hours) statistical analysis by choosing 5 points which are characteristic of the peak (prompt, ±0.044 and ±0.088). If the result of the comparison exceeds a given threshold, the corresponding signals are rejected.

Abstract: An antenna system enabling a link between an airborne object sending out a signal E with any polarization and a moving body equipped with a dual-polarization antenna comprises at least one device to determine the position of the moving body and of the airborne object, and an assembly for positioning the antenna. The system comprises at least one polarization combiner receiving two signals H and V coming from the dual-polarization antenna, the signals H and V resulting from the signal coming from the airborne object; the combiner being adapted to recombining the signals H and V in order to obtain a signal E optimizing the link balance between the moving body and the airborne object.

Abstract: An apparatus (30) for adjusting the phase of signals supplied to each element (E1-E8) of an antenna having a plurality of antenna elements, each element having a respective transmission line (34a, 34b) associated therewith, the apparatus comprising first supporting means (32) having a plurality of said transmission lines (34a, 34b) disposed thereon, and second supporting means (36), movable relative to said first supporting means (32), having a plurality of coupling links (38) disposed thereon. Each of said coupling links (38) comprises a length of transmission line arranged to capacitively couple with at least one of said transmission lines (34a, 34b) such that movement of said second supporting means (36) relative to said first supporting means (32) alters the effective length of one or more of said transmission lines (34a, 34b).

Abstract: A beam-forming antenna system includes an array of integrated antenna circuits. Each integrated antenna circuit includes an oscillator coupled to an antenna. A network couples to the integrated antenna units to provide phasing information to the oscillators. A controller controls the phasing information provided by the network to the oscillators. In an alternative embodiment, the phasing to each antenna element is controlled through a fixed corporate feed network. The relative gains of the antenna signals received or transmitted through the fixed corporate feed may be adjusted with respect to each other to provide a beam steering capability.

Abstract: A passive object detection system (1) comprises first and second antennas (4, 6) and a processor (8). The first antenna (4) is adapted to receive a signal transmitted by a mobile telephone base station; the second antenna (6) is adapted to receive the signal transmitted by a mobile telephone base station (2) after it has been reflected off an object (3) and the processor compares the signal received from the mobile telephone base station with the signal reflected from the object to derive speed or position information relating to the object therefrom.

Abstract: AirScene™, through a unique fusion process, is the only NOMS system to provide such data, digitally, and in a form that is integrated with flight tracks, noise events, complaint, and operations data. Other systems provide only the flight track, noise event, and complaint, and a manual recording of various ATC frequencies. Therefore other approaches do not offer any type of automated correlation of operational information with noise and flight track data. AirScene™ offers users the ability to record, search and query vast numbers of records using all of the above parameters, where available.

Abstract: A multi-frequency antenna with a single layer and a single feeding point, and especially an improved microstrip antenna with its bandwidths simplified and enlarged, it has a central microstrip with a set length and a set width; the bottom end of the central microstrip is used as a feeding point, the top end thereof is extended bilaterally to form respectively a first band section and a second ban section. The first band section is provided on the end thereof with a first open circuit point, and the second ban section is provided on the end thereof with a second open circuit point. A grounding line of a set length and a set width is located at a position a distance below the feeding point on the bottom end of the central microstrip. The lengths from the feeding point to an open circuit point on the end of the first band section and to an open circuit point on the end of the second ban section are both ¼ &lgr; of the ban section to be used.

Abstract: On an antenna forming face (9) in a rectangular shape which a dielectric base (7A) has, a linear element (11A) is provided adjacently only peripheries (9a, 9b, 9c, and 9d) of the antenna forming face (9). From the linear element (11A), a linear conductor (25) for matching impedance branches. Since the linear element is adjacent to only the peripheries (9a, 9b, 9c, and 9d) of the antenna forming face (9), portions of the linear element (11A) do not become adjacent to each other. Accordingly, mutual interference which easily occurs when the portions of the linear element (11A) are adjacent to each other does not occur, so that decrease of radiation efficiency of the dielectric antenna (1A) and hindrance to widening a band thereof can be eliminated as much as possible.

Abstract: A small antenna has two or more feeding ports. A radiator is made of a planar conductor having a substantially circular shape having the diameter of a substantially half wavelength or a substantially regularly polygonal shape where the length of a diagonal line passes through the center point is the substantially half wavelength. A ground plate is faced to the radiator. On the radiator, the feeding ports are connected to feeding points on two orthogonal line segments passing through the center of the radiator. This antenna is used as not only a single antenna but also two independent antennas having secured isolation between the feeding ports. A small antenna device used as two independent antennas is thus provided. The radiator is formed in a hat shape having an edge, has an Stepped Impedance Resonator (SIR) structure where the diameter of a crest part is a quarter wavelength, and is shortened.

Abstract: An antenna for wireless communication includes a radiator for receiving and transmitting radio frequency (RF) signals comprising a plurality of recesses formed on the sides of the radiator, a feeding plate stretching out from the radiator for transmitting the RF signals, and a ground plate stretching out from the radiator for grounding.

Abstract: An antenna system includes a plurality of transmit elements spaced apart by a first dimension and a plurality of receive elements spaced apart by a second dimension, such that the first dimension is a non-integer multiple of the second dimension and the second dimension is a non-integer multiple of the first dimension. A method includes transmitting a signal from a plurality of transmit elements spaced apart by a first dimension and receiving a portion of the transmitted signal reflected from an object via a plurality of receive elements spaced apart by a second dimension, such that the first dimension is a non-integer multiple of the first dimension and the second dimension is a non-integer multiple of the first dimension.

Abstract: In a wireless communication device 100, a preferably mesh, metal ground plane 314 serves both as an antenna ground plane or as an acoustic resistor for conditioning sound that passes through a sound port 120, 122. The metal ground plane 314 is located between a sound transducer 312 and a sound port 120, 122, but the metal ground plane 314 does not block sound due to openings in the mesh of the ground plane 314. The ground plane 314 permits an ear member 112 to be made thinner and reduces the number of parts required to manufacture the wireless communication device 100.

Abstract: An antenna including a base, a windback coil including a longitudinal portion and a coil portion, mechanically mounted onto the base and electrically coupled thereto, and a second coil mechanically mounted onto the base and electrically coupled thereto.

Abstract: With the object of forming a compact antenna that operates in a plurality of frequency bands, the pattern of an antenna element 14 that can resonate in a plurality of frequency bands is formed on the outer circumferential surface of an antenna bobbin 12. A parasitic conductor 11 is inserted into an accommodating hole which is formed substantially along the central axis of this antenna bobbin 12. As a result, an antenna that operates favorably in the frequency bands of AMPS, PCS and GPS can be obtained.