Abstract: A parasitic antenna includes a loop antenna and a metallic inductor, which is positioned on a side of the loop antenna and is isolated from the loop antenna. Upon receiving a signal, the loop antenna produces an electric field. The electrical field produced by the loop antenna radiates energy to the metallic conductor, causing the metallic conductor to produce an induced electric current, thereby generating an electrical field radiating outward. Because the direction of the electrical field produced by the metallic conductor is the same as that of the loop antenna, the radiating performance of the loop antenna is enhanced.

Abstract: A non-contact information communication apparatus according to the present invention has a bare IC and a sheet capacitor 3 implemented on substrate 1, and an antenna coil of vortical circle shape formed on the substrate 1 so as to enclose at least portion of the bare IC and the sheet capacitor 3. Because the number of turns of the antenna coil 4 is set to 7-10, the outer size of the antenna coil can be set to be equal to or smaller than one yen size. Each of the substrate 1, the antenna coil 4, the bare IC and the sheet capacitor 3 is thinned, and the thickness of the entire apparatus is set to be equal to or thinner than 100 &mgr;m. Because of this, the apparatus can be much thinner than the conventional apparatus, thereby using it in various field.

Abstract: A system for implanting a wire antenna in a contactless smart card includes an ultrasonic implanting head with a voice-coil actuator to control the pressure at which a heated wire is forced into a plastic card substrate. The force produced by the actuator is proportional to the current in a coil winding in the actuator. A controller uses a feedback system to maintain a relatively constant applied pressure. The feedback system monitors the current in the coil and the controller issues electronic signals to increase or decrease the current in the coil in response to the monitored current.

Abstract: In an electromagnetic coupling type four-point feeding loop antenna (10) comprising a tubular body (11), a loop portion (12) having a loop width (W1), four feeders (13) each having a feeder width (W2), and four electromagnetic coupling wires (17) each having a coupling wire width (W3), the loop width, the feeder width, and the coupling wire width are substantially equal to one another. A gap (&dgr;) between the feeder and the electromagnetic coupling wire is laid in a range between 0.2 mm and 0.8 mm, both inclusive, when the electromagnetic coupling type four-point feeding loop antenna has a feeding impedance of a range between 25 &OHgr; and 100 &OHgr;, both inclusive.

Abstract: A helical antenna tuned to a first and a second resonant frequency is disclosed. The helical antenna includes an elongated conductor formed as a uniform spiral. The uniform spiral has a plurality of turns about a longitudinal axis. The plurality of turns has a predetermined pitch and the elongated conductor has a length which is approximately one-quarter of a wavelength of the first resonant frequency. The helical antenna further includes a first dielectric element and a second element. Both elements are coupled to the spiral to selectively tune the antenna to the second resonant frequency. A wireless communication device including the helical antenna is also disclosed.

Abstract: Radiation synthesizer systems provide efficient wideband operation with an antenna, such as a loop, which is small relative to operating wavelength. Energy dissipation is substantially reduced by cycling energy back and forth between a high-Q radiator and a storage capacitance. Systems using multi-segment loop antennas match antenna input impedance to switching circuit parameters. Control signal feeds employ fiber-optic cables and reduce conductive paths. Multi-voltage DC supply configurations use parallel conductor portions of antenna loop segments and reduce the need for separate DC supply conductors. Spurious conductive loops are thereby reduced and lightweight, flexible antenna constructions are enabled.

Abstract: A segmented loop antenna formed of many segments connected in an electrical loop where the segments are arrayed in multiple divergent directions that tend to increase the antenna electrical length while permitting the overall outside antenna dimensions to fit within the antenna areas of communication devices. The loop antenna operates in a communication device to exchange energy at a radiation frequency and includes a connection having first and second conductors for conduction of electrical current in a radiation loop. The radiation loop includes a plurality of electrically conducting segments each having a segment length. The segments are connected in series electrically connected between said first and second conductors for exchange of energy at the radiation frequency.

Abstract: Two conducting lines are arranged in a ring form in a TEM-mode transmission line. The end of one of the lines is connected to the end of the other line with opposite polarity, thus forming a resonator for resonation in a half-wavelength mode. This structure, free of line discontinuity which lowers the Q value, can provide a resonator having a high Q value equivalent to that of the one-wavelength resonator. Moreover, it is satisfactory to provide a half of a length of the one-wavelength resonator. Accordingly, the structure of the resonator has reduced size but little Q-value deterioration.

Abstract: A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second end portion is connected to the ground plane. An input coupler is provided for matching an input impedance of the antenna to the antenna feed circuitry. The input coupler can comprise a conductive line disposed on the substrate adjacent to the antenna element. The conductive line is separated from the antenna element by a coupling space for coupling to the antenna element an input signal applied to the input coupler. The conductive line extends parallel to a portion of the antenna element including the first end portion. The arrangement has the advantage of having an input impedance that is relatively insensitive to adjustments affecting the antenna center frequency.

Abstract: An apparatus for conveying electromagnetic energy intermediate a host device and a medium substantially adjacent to the apparatus includes: (a) a transceiver for transmitting the energy to and receiving the energy from the medium; (b) a transmission structure for conveying signals to or from the host device; and (c) a feed structure coupling the transceiver with the transmission structure. The transceiver includes a planar metal layer arrayed upon a dielectric substrate. The metal layer is bounded by a first edge and a second edge. The first and second edges cooperate to form a bight having a first and a second arm establishing a metal-free area intermediate the first and second arms. The first arm presents a first terminal locus and the second arm presents a second terminal locus. The feed structure is coupled with the first and second terminal loci to effect the coupling.

Abstract: The present invention relates to a half-loop antenna having an antenna half-loop positioned on top of a ground plane, the antenna half-loop forming an area whose outer edge forms a convex closed curve, that is, it is curved toward the outside. Preferably, the developed view of the conductor half-loop has the form of an ellipse tapering to a point at its ends, and at the feed-in point of the conductor half-loop an inductance can be inserted, formed as a spring.

Abstract: A method for increasing the interrogation range of an RF Tag in a radio communication system using RF Tags with multiple reflecting antenna elements. The reflecting antenna elements are predeterminately positioned, and preferably aligned, with respect to each other in the direction of expected incident RF radiation. The reflecting antenna elements are sequentially pulsed on and off such that while the first reflecting antenna element is in a signal reflecting operating state, the remaining reflecting antenna elements are in a substantially non-reflecting state, and when the second reflecting element is in a reflecting operating state, the remaining reflecting elements are in a non-reflecting state, etc. The sequential pulsing and predetermined fixed spacing between the reflector elements generates constructive interference between the reflected signals of the reflecting antenna elements which increases the power of the resulting reflected signal.

Abstract: Antenna for sending and receiving microwave radiation, e.g. for use in a transponder in a transponder system for wireless payment of tolls, or the like. It has an excited antenna element (13) placed on a dielectric antenna carrier or substratum (11), e.g. on a printed circuit board laminate with a copper covered plastic basis suitable for manufacturing of so-called printed circuits. To increase the performance of the antenna for high production rates with cheap materials, the antenna element is placed such that it gets a directional effect mainly perpendicular to a bearing plane (12) of the substratum (11).

Abstract: One characteristic of electronic labels is that they can be read and written on without electrical contact through the communication coil (1). The reading head is then positioned at some distance and communicates with the label through electromagnetic waves.

Abstract: There is provided a built-in antenna device in a folder-type portable radio terminal having a body and a folder mounted to the main body to be rotatable at a predetermined angle with respect to the main body. A metal loop antenna is installed along the peripheral contour of the folder and an electrical connection means electrically connects the loop antenna to an RF (Radio Frequency) board of the main body. Therefore, the radiation performance of the antenna is maximized.

Abstract: Compensating electrical circuits are incorporated into loop antenna configurations for improved energy efficiency and extension of the magnetic fields for improved magnetic field coupling and reading of the tag by a reader. The tuning and compensating circuits provide a reader magnetic response having maxima at the center carrier frequency and at the low sideband frequency for improved reception of return signals from the tag to the reader.

Abstract: Location determination is performed using a transmitter including an elongated generally planar loop antenna defining an elongation axis. The elongation axis is positioned along at least a portion of a path. A magnetic field is then generated which approximates a dipole field. Certain characteristics of the magnetic field are then determined at a receiving position radially displaced from the antenna elongation axis. Using the determined certain characteristics, at least one orientation parameter is established which characterizes a positional relationship between the receiving position and the antenna on the path. The magnetic field may be transmitted as a monotone single phase signal. The orientation parameter may be a radial offset and/or an angular orientation between the receiving position and the antenna on the path. The antenna of the transmitter may be inserted into a first borehole to transmit the magnetic field to a receiver inserted into a second borehole.

Abstract: In order to enable one radiant electrode to transmit and receive signals with a plurality of frequency bands, in a base member, a feeding electrode to be connected to a signal supply source and an open electrode floated from the ground are arranged adjacent to each other leaving a space. In the base member, one end of a linear electrode is connected to the feeding electrode while the other end is connected to the open electrode. A substantially loop-shaped radiant electrode extending from the feeding electrode toward the open electrode via the linear electrode is defined by the feeding electrode, the open electrode, and the linear electrode. The linear electrode is provided with a short-cut electrode short-cutting a loop of the radiant electrode.

Abstract: The invention relates to double-action antenna structures. The structure comprises an antenna inside the covering of a mobile station, a switch (SW) and a whip, element (240) movable in relation to the former two. The internal antenna comprises two elements the first of which (220) is connected to the feed conductor (202) of the whole antenna structure and the second to the signal ground (203, 210). When the whip element is retracted, the said switch galvanically interconnects the elements of the internal antenna. Thus only the internal antenna functions and the whip has no practical significance. When the whip element is extended, its lower end disconnects, by means of the switch, the elements of the internal antenna, and the whip element itself is connected in series with the first element. Thus, a radiating element is provided by the series connection (240, 220) of the whip and the first element, and the shorted element (230) of the internal antenna has no practical significance.

Abstract: Terminal ends at one side of first and second elements 2a, 2b whose length is approximately half the wavelength of radiated radio wave are used as first feeding points #1, #2 and terminal ends at the other side of the individual elements are connected to a loop-shaped element 1 whose perimeter is approximately equal to the wavelength at two oppositely located points of four equally dividing points of the loop-shaped element 1. Terminal ends at one side of third and fourth elements 2c, 2d whose length is approximately half the wavelength of the radiated radio wave are used as second feeding points #3, #4 and terminal ends at the other side of the individual elements are connected to the remaining two oppositely located points. Electric power is fed into the first and second feeding points with a phase difference of 90°.

Abstract: In an antenna device 10 including a line-shaped or belt-shaped first conductor 11 having an electrically half length of a wave-length of a first resonant frequency, a feed point 12 to which an end of the first conductor is connected, a plate-shaped second conductor 13 on which the feed point is located and on which another end of the first conductor is grounded, an impedance element 14 is loaded halfway on the first conductor and which varies the first resonant frequency, a second resonant frequency, or both the first resonant frequency and the second resonant frequency. Accordingly, a compact antenna device 10 can therefore be constituted so that an impedance matching between the first conductor 11 and the feed point 12 may be readily obtained. In addition, the antenna device 10 can be commonly used with respect to a multi-frequency operation.

Abstract: Apparatus for creation of multidimensional and/or multidirectional electrical and/or magnetic fields for analysis or for treatment of a desired component of a specimen comprises a number of solenoid elements which are arranged in predetermined shaped structures to provide complicated patterns of inhomogeneous oscillating electrical and/or magnetic fields and whose configurations cause constant change in the direction of the fields so that each part of the apparatus has a field sector which has a different direction.

Abstract: An antenna system for a radio frequency (“RF”) wireless keyboard includes a metallic plate as a part of the antenna system. The metallic plate is located within the wireless keyboard. A RF transmitter is coupled to the metallic plate and an antenna wire which form an the antenna loop. The antenna loop may also be directly integrated into the metallic plate by creating a cut-out space in the metallic plate. The antenna system may also include the metallic plate directly coupled with the RF transmitter so that the metallic plate is a whip or dipole antenna. The RF transmitter generates RF signals associated with particular keyswitches of the wireless keyboard. The antenna system transmits the generated RF signals to a RF receiver that resides separately from, and that communicates with, the wireless keyboard.

Abstract: A method and apparatus for tracking items automatically is described. A passive RFID (Radio Frequency IDentification) tag is used with a material tracking system capable of real-time pinpoint location and identification of thousands of items in production and storage areas. Passive RFID tags are attached to the item to be tracked, remote sensing antennas are placed at each remote location to be monitored, interrogators with several antenna inputs are connected to the sensing antennas to multiplex the antenna signals, and a host computer communicates with the interrogators to determine item locations to an exacting measure.

Abstract: An omni-directional antenna assembly is provided for wireless communications devices requiring multiple polarization characteristics. An antenna assembly for a communications device operating at a predetermined wavelength and having a transceiver circuit including a signal output and a ground plane, the antenna assembly including a conductive planar element disposed away from the ground plane and a conductive leg member coupled to the planar element proximate a perimeter, the planar element being disposed a distance away from the ground plane of the communications device to define a region capable of receiving one or more components associated with the wireless communications device.

Abstract: A contactless identification system and an antenna coil capable of reliable transmission with multiple tags without a requirement of uniform distance from tag to antenna. The system also permits differing tag versus antenna planar orientations during tag passage through the antenna opening. The system creates a contactless identification system with a shaped antenna coil having an opening at the center, whereby the antenna section is transferred or varied in position or orientation with respect to piled objects with attached tags, so that the objects pass through the opening, producing transmission between the antenna coil and each of the tags.

Abstract: There is disclosed a meanderline loaded antenna comprising a ground plane, two vertical elements orthogonally affixed thereto, and a horizontal element between the two vertical elements. A meanderline coupler interconnects the horizontal element, at each of its ends, to the vertical elements. The antenna further includes an additional radiating element extending from the horizontal element in approximately planer relationship therewith. Additionally, the antenna includes a tuning element extending from the horizontal element and forming an acute angle with the adjacent vertical element.

Abstract: A loop antenna formed of an radiation loop and a reference loop. The reference loop is generally the same size, shape and electrical length as the radiation loop and is located in the near field of and in close proximity to the radiation loop. In communication devices having conductive surfaces, components, shielding and other conductive elements in close proximity to the radiation loop, the coupling to the radiation loop that tends to de-tune or otherwise interfere with the operation of the radiation loop is reduced by the reference loop.

Abstract: The invention concerns an arrangement for an antenna (A) having the general shape of a loop, directly in the proximity of at least a metallic element (10). The invention is characterised in that each metallic element (10) comprises an orifice (18) arranged substantially opposite the surface defined by the antenna (A), and a slot (16) forming a gap width, arranged through the thickness of the metallic element (10), between the internal edge (21) delimiting the orifice (18) and the external edge (20) of said metallic element (10). The invention is applicable to scanners and radio frequency communication devices.

Abstract: An apparatus for conveying electromagnetic energy intermediate a host device and a medium substantially adjacent to the apparatus includes: (a) a transceiver for transmitting the energy to and receiving the energy from the medium; (b) a transmission structure for conveying signals to or from the host device; and (c) a feed structure coupling the transceiver with the transmission structure. The transceiver includes a planar metal layer arrayed upon a dielectric substrate. The metal layer is bounded by a first edge and a second edge. The first and second edges cooperate to form a bight having a first and a second arm establishing a metal-free area intermediate the first and second arms. The first arm presents a first terminal locus and the second arm presents a second terminal locus. The feed structure is coupled with the first and second terminal loci to effect the coupling.

Abstract: A segmented loop antenna formed of many segments connected in an electrical loop where the segments are arrayed in multiple divergent directions that tend to increase the antenna electrical length while permitting the overall outside antenna dimensions to fit within the antenna areas of communication devices. The loop antenna operates in a communication device to exchange energy at a radiation frequency and includes a connection having first and second conductors for conduction of electrical current in a radiation loop. The radiation loop includes a plurality of electrically conducting segments each having a segment length. The segments are connected in series electrically connected between said first and second conductors for exchange of energy at the radiation frequency.

Abstract: An antenna for transferring electromagnetic energy includes: (a) a ground element in a ground plane; (b) a transceiver element in a transceiver plane that intersects the ground element at a first end in a joint having a first terminus and a second terminus; and (c) a feed structure that conveys the electromagnetic energy intermediate the transceiver and the host device. A first transceiver edge departs from the joint in a first path in a first direction. A second transceiver edge departs from the joint in a second path in the first direction. Each edge includes at least a first edge sector having a first radius and a second edge sector having a second radius. The radii define a separation between the edge sectors. The first and second edge terminate in a terminal structure at a second end that is spaced from the ground element to establish a gap.

Abstract: The present invention discloses a reader coil antenna, and a non-contacting type card identification system using the same for increasing the sensing region of the card reader system. The reader coil antenna includes an outer coil for forming a predetermined loop, and which forms a magnetic field by receiving a current, along with at least one inner coil disposed inside the loop of the outer coil, for generating a constructive interference in a direction of the magnetic field of the outer coil. The card identification system, of the present invention, includes a reader coil antenna which forms a magnetic field due to a signal applied to flow in a single direction, a card reader for transmitting an operating signal through the reader coil antenna, and decoding an input signal from a non-contacting type card, and a control unit for deciding identification of the non-contacting type card according to the decoded signal.

Abstract: An apparatus (1) for converting solar energy into electrical energy and for radiating and/or receiving high frequency electromagnetic waves is described. The apparatus (1) includes at least one solar cell (2) provided with electrodes in the form of electrically conducting contacts, wherein at least one of the contacts of the solar cell at the same time forms an antenna element.

Abstract: Circuit modules having one, two or three double-sided printed circuit boards (PCBs). Each PCB can have coils formed as spiral traces on both sides thereof. The coils can all be connected together, in series or in parallel, to function as a coil antenna. Alternatively, selected ones of the spiral traces can be connected to function as one winding of a transformer, the other coils functioning as another winding of the transformer and connected to an external antenna. Electronic components can be mounted to a lower one of the PCBs, and in embodiments having two or three PCBs, the PCB overlying the lower PCB has a central opening to accommodate the electronic components. A ferrite rod antenna may be disposed in the opening, aligned parallel to the PCBs, to provide a dual-directional antenna system.

Abstract: In an antenna for communicating an electromagnetic wave, a first converger converges the electromagnetic wave. A second converger faces the first converger and includes a conductor plate having a through hole, into which a magnetic flux of the converged electromagnetic wave is converged. The through hole is formed at a center portion of the conductor plate so as to have a size which is sufficiently smaller than a wavelength of the electromagnetic wave. The conductor plate is formed with a cutout extending from a part of the through hole to an outer periphery of the conductor plate. A converter faces the through hole of the conductor plate to convert the converged magnetic flux into voltage.

Abstract: Automobile vehicle fitted with a dedicated communication system provided with an antenna (4) and enabling exchanges of data signals within a communication area corresponding to the antenna radiation area, forming a volume with a chosen shape and dimensions.

Abstract: An antenna system includes a first portion and a second portion. The first portion and the second portion form an antenna loop. The first portion may be etched on a printed circuit board. The second portion may be coupled with the first portion or extend from the first portion. The first portion and the second portion each may have one or more turns. Further, the second portion of the antenna loop resides in a three-dimensional geometric space that is different from the first portion of the antenna loop. The antenna system is particularly well suited for electronic devices having a confined internal space, for example, a cordless pointing device, a cordless gaming device, or a cordless camera device. A method for designing an antenna system is also disclosed.

Abstract: A radio-frequency identification (RFID) transponder (tag) in accordance with the principles of the invention includes a hollowed monopole antenna. The hollowed monopole antenna is co-located on a substrate with RFID circuitry and a quarter wave transformer. The quarter wave transformer acts as a reference for the RFID circuitry. The monopole antenna may have a trapezoidal shape, such as triangular or rectangular, that increases the effective electrical length of the antenna without increasing its overall surface area.

Abstract: An antenna system includes a first portion and a second portion. The first portion and the second portion form an antenna loop. The first portion may be etched on a printed circuit board. The second portion may be coupled with the first portion or extend from the first portion. The first portion and the second portion each may have one or more turns. Further, the second portion of the antenna loop resides in a three-dimensional geometric space that is different from the first portion of the antenna loop. The antenna system is particularly well suited for electronic devices having a confined internal space, for example, a cordless pointing device, a cordless gaining device, or a cordless camera device. A method for designing an antenna system is also disclosed.

Abstract: A one-wavelength loop antenna element (103) shaped like a rectangle is placed close to a radio base plate (101) and further is bent at both end parts toward a feeding section, whereby a current distribution where the current at the tip of turn up becomes zero is formed. Current is concentrated on the loop antenna element (103), so that the current component flowing onto the top of the radio base plate (101) is decreased, the effect produced when a human being carries a radio containing an antenna including the loop antenna element is suppressed, and the directivity responsive to an arrival wave is formed.

Abstract: A UHF indoor TV antenna for providing better UHF TV reception. The UHF indoor TV antenna includes a base member being adapted to rest upon a surface; and also includes a signal receiving member having end portions which is securely disposed in the base member with the signal receiving member extending outwardly from the base member; and further includes a TV connecting member having a first end and a second end which is disposed in the base member and which is connected to the end portions of the signal receiving member.

Abstract: A thin plane antenna that copes with the horizontally polarized waves and the vertically polarized waves, or the levo-rotary polarized waves and the dextro-rotary polarized waves, and in which a loop-shaped plane antenna element (12) is arranged in parallel with a ground plane (15), and a first feeder conductor (13) and a second feeder conductor (14) having feeding points displayed by 90 degrees are arranged between the plane antenna element and the ground plane. Central conductors (18a) and (19a) of the coaxial lines are connected to the first and second feeder conductors, and external conductors (18b) and (19b) thereof are connected to the ground plane to feed electric power to the antenna element through the electromagnetic coupling. When the electric power is fed from the first feeder conductor (13), the horizontally polarized waves are radiated and when the electric power is fed from the second feeder conductor (14), the vertically polarized waves are radiated.

Abstract: A loop antenna assembly (2) for an electronic device includes a primary assembly (21) and an assistant assembly (22) mounted perpendicular to the primary assembly. The primary assembly includes a primary printed circuit board (PCB) (210) with a planar, monopole antenna in the form of a first circuit trace (211) fixed thereon, a feeder cable (212) and a connector (215). The assistant assembly includes an assistant PCB (220) with a second circuit trace (222) and an auxiliary wire (221), which extends parallel to the primary PCB and couples with the monopole antenna on the primary PCB to form a loop for high frequency signal transmission.

Abstract: A communication system which utilizes the building metal frame as a communication medium is described. More particularly, and in accordance with one embodiment of the present invention, a wire coil is located near to one of the frame pieces so that the coil lays flat in the plane of the building face. A time varying current in the coil creates a time varying magnetic dipole field. This field changes the flux within a “flux window” which is defined as one of the rectangular sections formed by the frame steel members. This changing flux creates a time varying potential around the window, which creates a time varying current that acts in opposition to the induced flux. This current also excites a time varying flux in the neighboring flux windows, which induces time varying fluxes in their neighbors and so on.

Abstract: A contrawound helical antenna produces a uniformly directed circulation of magnetic current with a plurality of magnetic dipole elements. In one embodiment, the magnetic dipole elements have the same curvature, and the magnetic currents on respective magnetic dipole elements are each directed in the same direction, relative to the central signal coupler of the magnetic dipole antenna. In another embodiment, the magnetic dipole elements have the opposite curvature, and the magnetic currents on respective magnetic dipole elements are each directed in opposite directions, relative to the central signal coupler of the magnetic dipole antenna.

Abstract: An antenna configuration in an apparatus for detecting a child safety seat placed on a seat in a motor vehicle. A single transmitting antenna formed as a loop surrounds two loop-shaped receiving antennas. The receiving antennas receive electromagnetic measurement fields originating from an electromagnetic exciter field transmitted by the transmitting antenna.

Abstract: The present invention features an improved radio frequency identification (RFID) reader which operates with a low power consumption and which may tolerate a wide fluctuation in input voltages. The RFID reader is housed so that the influence of its physical surroundings, especially metallic objects, on system performance is minimized. A pre-compensation metal plate is used to stabilize the self-resonant frequency of the reader, even in the presence of large metal masses. The pre-compensation plate may be formed from aluminum or another non-ferrous material or, for long-range RFID readers, from ferrite or another similar, high magnetically permeable material. In addition, the RFID reader features improved sensitivity so that the effective operating distance is maximized. Also, the operating frequency is dynamically controlled in discrete steps of 10 Hz or less so that the effects of component parameter drift, temperature change, or other external factors are minimized.

Abstract: An antenna for mounting on a vehicle which restrains damping of a signal voltage by reducing a stray capacitance of a signal path and has an improved antenna characteristic and a short physical length, and an antenna element which is suitable for an antenna for mounting on a vehicle and is flexible by using a helical coil of a large winding diameter are provided. In the antenna for mounting on a vehicle, with respect to a band signal having a short wavelength of a plurality of band signals to be transmitted/received, an antenna element is caused to resonate with a physical length shorter than ¼ of the wavelength of the band signal. A linear line portion is provided at the proximal end, and the antenna element is provided at a predetermined distance from vehicle body and a conductive member of the same electric potential as the vehicle body. The stray capacitance between the proximal end portion of the antenna element and the vehicle body is small, and a signal voltage is outputted without being damped.

Abstract: A wideband slot-loop antenna is described which comprises a generally planar loop element having a generally rectangular outer perimeter and a slot defining an inner perimeter, the mid portion of the slot-loop structure providing a major radiation portion of the antenna; a loading structure extending from one end of the slot, the loading structure for top loading the radiation portion; and an impedance matching portion for coupling a feed to the major radiation portion. The antenna also includes distributed matching patches. The distributed matching patches realize extra wideband performance. The antennas in the present invention are suitable for various wireless communications, such as PCS, Cellular Telephone, wireless data and computer network.