Abstract: An antenna structure is composed of an antenna seat, a terminal, and an antenna set. The antenna set includes antennae, a matching circuit, conducting wires, and a lead wire. By the conducting wires and matching circuit connected on the antennae, an impedance matching can be achieved to be coupled with frequency of radio wave signal to be received for reducing a standing-wave ration, when the antenna are receiving the radio wave signal. In addition, the frequency and wavelength of radio wave signal received by the antennae can be adjusted by changing lengths of conducting wires.

Abstract: Disclosed herein is a wideband glass antenna for a vehicle. The wideband glass antenna includes a loop antenna and a pattern. The loop antenna has a loop antenna pattern, in which a first side is connected to a feeding point, a second side is connected to a ground, and the two sides are connected to each other. The loop antenna pattern forms a predetermined space in the loop antenna. The pattern is formed in the loop antenna and is connected by a plurality of tuning arms for expanding a frequency band of the antenna.

Abstract: A high gain loop antenna comprises a conductor ground plane, a feeding signal line, a radiation element including two matching sections and a conductor loop, and a dielectric element formed between the conductor ground plane and the radiation element. Both matching sections connect to the feeding signal line and the radiation element for matching the input impedance. The input impedance can be changed by adjusting the distance between the two matching sections or the lengths of the two matching sections. The conductor loop is to activate the operating mode of the antenna when the current component flows through the loop antenna.

Abstract: A radio terminal device has an antenna element, a coil, a switch, an RF circuit section and a conductive substrate. The switch is used to switch between a case where current distribution exists only in the antenna element and its vicinities and a case where the current distribution exists not only in the antenna element and its vicinities but also in other places. Additionally, the switch is switched in accordance with the usage pattern in which the user uses the radio terminal device (e.g., telephone call and data communication). This allows the transmission/reception to be performed with the antenna polarization and directivity suitable for the usage pattern. Thus, there can be provided a radio terminal device that exhibits a reception characteristic suitable for a respective situation.

Abstract: A thin and flexible radio frequency (RF) antenna tag or label is disclosed which contains an RF circuit connected to an antenna which is created by demetallizing the area around the antenna pattern on a thin, metallized substrate such as a film or paper web. Antenna(s) may be formed on one or both sides of the substrate and can contain printed, holographic, optical variable device, diffractive, dot matrix, computer-generated holograms or computer-generated optical images. The demetallized RF antenna on the substrate can optionally further be transferred to a second substrate or web by means of a cold foil stamping process. The tag or label is thin and flexible, enabling a wide range of applications including RF tagging of anti-theft devices, product packaging of all types, credit cards, passports, admission tickets, stamps, vehicles, badges, fare cards, roadway tolls, customs and immigration checkpoints identification, and animal identification/tracking devices.

Abstract: A radio transmitting or receiving antenna which is physically compact being typically no more than three percent of a wavelength in any dimension. The antenna comprises two electrical conducting surfaces (2) and (4) across which radio frequency electric field lines carrying half the power are arranged to cross radio frequency magnetic field lines carrying the remaining half power to thereby synthesize and propagate radio waves. The low impedance coaxial feeder (1) from the transmitter flows through a set of coils (3A) to (3D) wired in parallel and lying in a toroidal shape to create a circular RF magnetic field H and then enters a low impedance tap on a resonant autotransformer used to connect a high RF voltage and create a curving electromagnetic field E across the interaction zone in the volume between the upper metal cylinder (4) and the ground plane (1).

Abstract: Described herein are a transient event detector (35) comprising electrical circuitry (50) suitable to detect a transient event, and a container (34) having a wall with at least two electrically conductive contacts (23, 44) electrically connected to the electrical circuitry (50), each of the at least two electrically conductive contacts (23, 44) being electrically isolated from each other, and a movable electrically conductive piece (36) that intermittently connects at least two of the at least two electrically conductive contacts when the electrically conductive piece (36) is in motion. An RF circuit (54) couples to a loop antenna (25) having a tuning capacitor (26) formed as conductive pads (26?, 26?) juxtaposed on opposing sides of a planar dielectric substrate (92). The tuning capacitor (26) has a hole (27) through it, and the hole has a size that is selected to cause the loop antenna (25) to exhibit a desired resonance frequency.

Abstract: The antenna and the electronic control circuit of the transponder are contained in a totally hermetical metallic enclosure. The antenna of the reader is protected from the environment by a metallic front plate that is integral with the enclosure containing the electronic control circuit. In a preferred embodiment, the enclosure is hermetically tight. These embodiments fulfill the longstanding need to obtain completely tight elements that are resistant to industrial aggressions.

Abstract: The present invention relates to an integrated circuit package comprising at least one substrate, each substrate including at least one layer, at least one semiconductor die, at least one terminal, and an antenna located in the integrated circuit package, but not on said at least one semiconductor die. The conducting pattern comprises a curve having at least five sections or segments, at least three of the sections or segments being shorter than one-tenth of the longest free-space operating wavelength of the antenna, each of the five sections or segments forming a pair of angles with each adjacent segment or section, wherein the smaller angle of each of the four pairs of angles between sections or segments is less than 180° (i.e.

Abstract: An indoor UHF antenna device for a digital television includes a flat structural design. The flat indoor UHF antenna device includes a circuit board having a wireless signal processing circuit and an antenna. A metal wire bent as a long rectangular antenna and having a gap forms the antenna. Two signal feeder points are defined at two locations having a same distance from two long sides of the long rectangular antenna respectively, and thereby the antenna includes a first antenna part having a gap and a second antenna part for impedance matching. The antenna is set horizontally on the circuit board with the signal feeder points welded on the circuit board. Thereby the antenna device of the present invention is enhanced to receive wireless signals of polarized waves transmitted by different transmitters.

Abstract: A loop antenna unit (2), a balanced line (3), and two perturbation elements (4) are formed on a dielectric board (1) by using manufacturing methods, such as printing and etching. The loop antenna unit (2) is formed along the circumference of a circle, and is connected to the balanced line (3). Each of the two perturbation elements (4) is a member in the shape of a tooth which is inclined 45 degrees against a direction of feeding of power via the balanced line (3) and which is projecting from the loop antenna unit (2) in an inward direction toward the center of the loop antenna unit (2). The two perturbation elements (4) are arranged at two opposite points in the loop antenna unit (2) so that they are opposite to each other.

Abstract: In a loop antenna including a circuit board, a cylindrical body standing on a surface of the circuit board, and a loop antenna element formed on the cylindrical body along the peripheral surface, a tubular insulator member is placed with some space around the cylindrical body. A conductor ring is formed on the tubular insulator member along the peripheral surface, and is placed on an intermediate position between the surface of the circuit board and the plane formed by the loop antenna element. A conductor wall is placed with some space around the cylindrical body on an intermediate distance between the surface of the circuit board and the plane formed by the loop antenna element into height.

Abstract: A method and an apparatus for manufacturing a device are provided. The method and the apparatus can form micro wiring without undesired wetting and spreading using an inexpensive functional-liquid supplying method. A method for forming a device, such as a radiofrequency identification tag, includes: making patterns at a plurality of sections having different degrees of affinity to the functional liquid on a substrate to form the device; and supplying the functional liquid to the selected section having high affinity to the functional liquid. Forming the plurality of sections having different degrees of affinity to the functional liquid includes, for example: supplying an organosiloxane film on the substrate, and exposing the organosiloxane film through an optical mask.

Abstract: The present invention relates to an electronic device that suppresses reduction in reception sensitivity and occurrence of distortion when IC cards are used while stacked. A loop antenna equipped on the IC card has up to four turns, and is designed so that one turn, for example, has a first linear portion, a first curved line portion, a second linear portion, and a second curved line portion. When two electronic devices having a first loop antenna and a second loop antenna, respectively, are stacked onto one another, the corners of the loop antennas do not overlap. For example, the corner formed by first curved line portion and the second linear portion of the first loop antenna is overlapped with the first curved line portion of the second loop antenna. The first and second loop antennas are shaped such that when two electronic devices are stacked, their respective loop antennas are superimposed in the opposite direction so that the corners are not overlapped and the amount of overlap as a whole is reduced.

Abstract: A scanner has plasma loop or plasma window antennas for selectively scanning for ID tags along distinct radials of the scanner. Scanner elements are made electromagnetically invisible to adjacent elements by removing power or lowering plasma densities so that the scanner elements do not interfere with its own operation. Activatable ID tags and a shipping container suitable for scanning with electromagnetic energy are also disclosed.

Abstract: A deactivation apparatus for an electronic article surveillance tag having a plurality of layers and an equivalent resonant circuit containing an inductor and a capacitor is provided. The apparatus includes: a capacitor formed by a pair of conductive capacitor plates separated apart by a dielectric layer; an inductor connected to each of the pair of capacitor plates where an electromagnetic field of a preselected frequency at a first magnitude impinging upon the tag causes the equivalent resonant circuit to resonate and produce a detectable response from the tag; and, an electrically weakened area in the dielectric layer between the pair of conductive capacitor plates where the electromagnetic field at a second magnitude higher than the first magnitude impinging upon the tag causes a conductive path through the weakened area electrically connecting the pair of capacitor plates together and deactivating the tag.

Abstract: A dielectrically-loaded loop antenna with a cylindrical dielectric core, a feeder structure passing axially through the core, a sleeve balun encircling one end portion of the core and helical antenna elements extending from a feed connection with the feeder structure at the other end of the core to the rim of the balun. The antenna elements are arranged as a pair of laterally opposed groups of conductive elongate helical elements each having at least first and second conductive elements of different electrical lengths to form a plurality of looped conductive paths. By forming at least one of the conductive elements in each group as a conductive strip with one or both edges meandered, such that the edges of the strip are non-parallel and have different electrical lengths, additional modes of resonance arc created, yielding an improvement in bandwidth.

Abstract: The disadvantages associated with the prior art are overcome by a method and apparatus for reducing multipath distortion in a television signal. Specifically, a plurality of antenna elements receive spatially unique replicas of a desired television signal. The spatially unique replicas are coupled to an adaptive combiner, which generates a spatially combined signal to be coupled to a television receiver. The adaptive combiner forms a weighted summation of the spatially unique replicas, which effectively places spatial nulls in the direction of the multipath interference. The weighting information is provided by an adaptive controller that uses intelligence from a multipath processor located within the apparatus. The intelligence may take the form of a figure of merit derived from the combiner output, or from processing preformed on the input signals themselves.

Abstract: The present disclosure includes a system that provides visual and electronic information in a readily identifiable system. For example, the present disclosure is directed to a combination tag, suitable for use as a vehicle identification window sticker. The combination tag includes a retroreflective article having an optical surface and a radio frequency responsive element. The radio frequency-responsive element includes an antenna and an integrated circuit. The radio frequency-responsive element has information storage and transmission capabilities adapted to enable an interrogation system to obtain information from the radio frequency-responsive element. The radio frequency-responsive element is operably coupled to the retroreflective article.

Abstract: A multi-band antenna for enabling an electronic device (such as a laptop computer) to operate in two frequency bands comprises an insulative substrate (30), a conductive element disposed on the substrate, and a feeder cable (40). The conductive element and the feeder cable form a planar inverted-F antenna (10, 23, 21, 25, 24, 11) operating in a lower frequency band and a planar loop antenna (10, 23, 22, 24, 11) operating in a higher frequency band.

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: A magnetically coupled antenna range extender structured to be interposed between an RF antenna and an electronic device. The antenna range extender is positioned between and proximate to one of the RF antenna and the electronic device, for extending the operating range over which information may be communicated and exchanged between the RF antenna and the electronic device.

Abstract: An assembly includes a device for receiving at least one input to produce an output. An antenna supports the device to transfer the input to the device and further to transfer the output from the device such that the antenna supports a selected one of the input and the output as a high frequency current. The antenna includes a peripheral configuration which confines high frequency current to at least one dominant path to oscillate therein. The other one of the input and the output is a lower frequency signal present at least generally throughout the antenna. At least one port is positioned away from the dominant path to isolate the lower frequency signal from high frequency current in the dominant path. The antenna is configured to support the lower frequency signal having a frequency in a low frequency range including zero to several terahertz.

Abstract: The invention concerns an antenna for use as transmission/reception beacon (2), in a radiofrequency identifying en system, having a general upturned U configuration, located in a vertical plane, above the ground transversely to a passage (9), the antenna thus forming an unclosed loop. Said antenna can consist of a single wire (8), with horizontal median portion (8a), and vertical end portions (8b, 8c). The invention is applicable to a system for detecting, over a large width (L), the passage of people, animals or objects bearing electronic tags (7).

Abstract: A non-contact IC card includes an information storage unit for storing information, a communication controller for controlling communication with an external device, and a loop antenna for transmitting and receiving a radio wave to and from the external device. The non-contact IC card further includes a changeover switch for changing a communication distance between the external device and the card, so that the cost and size of the card can be reduced. The non-contact IC card can be used both in a long-distance mode and in a contact mode, which ensures high security.

Abstract: The invention relates to an antenna coupler (1) for testing mobile transmitters and/or receivers, in particular mobile telephones (2). Said coupler has a receiving element (4) and/or a bearing surface (20) for the mobile transmitter and/or receiver and at least one antenna element (5, 25, 35). According to the invention, the antenna element (5, 25, 35) is configured as a loop that is essentially closed in spatial terms.

Abstract: There is disclosed an antenna exhibiting resonance over a broad frequency band or over a plurality of closely-spaced frequency bands, comprising a ground plane, a non-driven element affixed substantially perpendicular to the ground plane, a driven element affixed substantially perpendicular to the ground plane and a horizontal conductor electrically connected between the driven and the non-driven elements and disposed substantially parallel to the ground plane. The non-driven and the driven elements further comprise periodic slow wave structures. The periodic slow wave structures are configured to provide a substantially constant propagation factor with respect to the applied signal frequency, such that the antenna exhibits broad resonance characteristics.

Abstract: A loop antenna system. The loop antenna system for a wireless transmission device having a signal end and a ground end, includes a loop antenna having a toroidal helix wire with a first end coupled to the signal end and a second end coupled to the ground end.

Abstract: Antennas of broadband and multi-band operation are presented. A broadband planar antenna includes two inverted-L antennas (ILAs) facing each other across a gap. One of the ILAs is input fed, and the other is electromagnetically coupled. The positioning of the gap affects the bandwidth. A dual-band planar antenna includes two ILAs facing each other across a gap with one of the ILAs being input fed, and the other being coupled. This dual-band planar antenna also includes a monopole antenna disposed between the two ILAs. A triple-band planar antenna includes two ILAs facing each other across a gap with one of the ILAs being input fed and the other IPA being coupled. This triple-band antenna also includes a monopole antenna disposed between the two ILAs, and a conductor extending horizontally from the monopole antenna towards, but not reaching the coupled ILA. Another dual-band antenna includes an inner cut loop antenna encompassed by an outer cut loop antenna.

Abstract: An apparatus and method for enabling far-field radio-frequency communications with an implantable medical device in which an antenna is embedded within a dielectric around the periphery of the device. Such a circumferential antenna saves space while still permitting far-field telemetry over a desired range of frequencies.

Abstract: A stagger tuned meanderline loaded antenna is disclosed. The antenna meanderlines are configured for manipulating the antenna's current null, which enables a combination of loop mode and monopole mode current distribution. The antenna quality factor can be adjusted substantially independent of antenna gain to achieve an extended Chu-Harrington relation.

Abstract: A standard slow wave meander line having sections of alternating impedance relative to a conductor plate is provided with a top shield connected to the conductor plane for the purpose of lowering the resonant frequency of narrow band antennas and lowering the low frequency cutoff limit of wide band antennas due to a higher delay per unit length occasioned by the use of the top shield. The shielded meander line may be utilized as a coupling device to truncated antennas such as a whip antenna or grounded loop antenna for the purposes of loading the antenna so as to provide lower frequency performance. Since the propagation constant of the meander line structure depends upon the number of high impedance/low impedance transitions per unit length, the utilization of the top shield results in more phase shifts per unit length and thus more delay per unit length, with the symmetric double sided version having double the number of transitions per unit length.

Abstract: A low cost moldable transformer or trans-inductor core, referred to in this description as a transductor. Elements of the transductor core are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductor fibers, micron conductor powders, or in combination thereof homogenized within a base resin host wherein the ratio of the weight of the conductor fibers, conductor powders, or combination thereof to the weight of the base resin host can be between about 0.20 and 0.40. The micron conductive fibers or powders, can be of stainless steel, nickel, copper, silver, carbon, graphite, plated particles, plated fibers, or the like. Transductors can be formed using methods such as injection molding, over-molding, thermo-set, protrusion, extrusion, compression, or the like, in combination with a large number of production or wire wrapping techniques to achieve desired electrical characteristics.

Abstract: A handheld transmitter and/or receiver for use in a frequency band B with an electric power less than or equal to 10 mW, wherein the frequency band is 50 MHz≦B≦500 MHz. A transmitter and/or receiver module is operationally connected to a transmitter and/or receiver antenna. A casing is made of two parts linked to be mutually movable. At least one predominant part of the module is built into one of the casing parts. The other of the two casing parts includes the antenna.

Abstract: An electromagnetic antenna apparatus exhibits a generally continuous signal response between a first frequency and a second frequency, and further exhibits a deviation from the signal response in a frequency region centered substantially at a selected frequency between the first frequency and the second frequency. The apparatus includes: (a) an antenna transceiving element; (b) a feed structure coupled with the antenna receiving element for communicating transceiving signals with the antenna transceiving element; and (c) a discontinuity structure in the antenna transceiving element coupled with the feed structure. The discontinuity structure is configured for effecting return of selected transceiving signals to the feed structure as return signals. The return signals effect the deviation.

Abstract: A dual uncoupled mode box antenna which includes a conductive bottom horizontal ground plane, and a box structure superimposed on this ground plane. The box structure includes a vertical first conductive side insulated from the ground plane, and a vertical second conductive side insulated from the ground plane positioned in gapped relation to the first side. There is also a vertical third conductive side which is grounded to the ground plane and which is positioned in perpendicular gapped relation to second side. A vertical fourth conductive side is also grounded to the ground plane and is positioned in perpendicular gapped relation to the first and third sides. A conductive top is superimposed over and insulated from the first, second, third, and fourth sides. The first and second sides are fed in quadrature to create either left handed or right handed polarization.

Abstract: A tag device is described for receiving, processing and/or transmitting data signals using an integrated electronic data-processing circuit formed in an essentially plane substrate body and at least two electrodes arranged on the plane substrate body, which electrodes are connected to the data-processing circuit in such a way that they are adapted to transmit and/or receive the data signals and/or electric power supply energy using offset currents produced via a quasi-static, electric alternating field. This tag device is very simple and inexpensive, and has a great reliability of operation. Furthermore, a system with such a tag device and a corresponding reading apparatus are described.

Abstract: A compressed antenna in a volume, with one or more of the compressed antennas suitable for use in the front ends of small communications devices. The compressed antennas operate for exchanging energy in one or more bands of radiation frequencies. The antennas include one or more radiation elements formed of conducting electrically connected so as to exchange energy in one or more of the bands of the radiation frequencies. One or more of the radiation elements has segments three-dimensionally arrayed and compressed in a volume.

Abstract: A compressed antenna in a volume suitable for use in the front ends of small communications devices. The compressed antenna operates for exchanging energy in one or more bands of radiation frequencies. The antenna includes one or more radiation elements formed of segments electrically connected so as to exchange energy in one or more of the bands of the radiation frequencies. The radiation element has segments three-dimensionally arrayed and compressed in a volume.

Abstract: A finely-tuned, compressed antenna in a cube with one or more frequency bands and with high isolation between bands. The antenna is suitable for use in the front end of small, hand-held communications devices. The antenna includes one or more radiation elements, each element for operating in one or more of the bands. A radiation element is formed of a plurality of sections formed of electrically conducting segments where the segments are electrically connected to exchange energy in one or more of the bands of the radiation frequencies. One or more of the radiation elements has segments arrayed in a compressed pattern where the compressed pattern extends in three dimensions to fill a cube.

Abstract: A multi-band antenna (1) for an electronic device comprises an insulative substrate (30), a feeder cable (40) and a conductive element disposed on the substrate including a radiating portion (21), a first connecting portion (22), a second connecting portion (23) and a ground portion (10). The radiating portion includes a plurality of radiating segments (211-218). The first and second connecting portions connect the ground portion with the radiating portion. A part of the radiating portion, the second connecting portion, the ground portion and the feeder cable form a planar loop antenna. The radiating portion, the first connecting portion, the ground portion and the feeder cable form a planar inverted-F antenna.

Abstract: The invention concerns an efficient loop antenna of reduced size. The antenna is formed on a dielectric substrate disposed on a conductive ground plane. The substrate has a plurality of regions of differing substrate characteristics. An elongated conductive antenna element is arranged in the form of a loop and disposed on a first region of the substrate. The antenna element can have first and second adjacent end portions separated by a gap. The first region of the substrate has a relative permeability that is higher as compared to a second region of the substrate on which the remainder of the circuitry is disposed. According to one aspect of the invention, the relative permeability of the first region is greater than 1.

Abstract: A stagger tuned meanderline loaded antenna is disclosed. The antenna meanderlines are configured for manipulating the antenna's current null, which enables a combination of loop mode and monopole mode current distribution. The antenna quality factor can be adjusted substantially independent of antenna gain to achieve an extended Chu-Harrington relation.

Abstract: A wideband meander line loaded antenna is configured to be flush mounted to a conductive surface serving as a ground plane by embedding the meander line components within a conductive cavity surrounded at its top edge by the ground plane. The antenna thus looks out of a cavity recessed in the surface. By permitting flush mounting the meander line antenna, not only can the antenna dimensions be minimized due to the use of the meander line loaded antenna configuration, but in aircraft applications no part of the antenna exists above the skin of the aircraft, thereby to minimize turbulent flow. Moreover, when adapted to wireless handsets or laptop computers, the depth or thickness of the unit need not be increased when providing a wideband antenna, thus to minimize the overall dimensions of the device.

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: An omni-directional antenna assembly is provided for wireless communication devices requiring multiple polarization characteristics. A loop 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 loop element and a conductive leg member coupled to the loop element proximate a loop perimeter, the leg member for supporting the loop element at a distance away from the ground plane of the communications device, the leg member also defining a ground point and a feed point for operatively coupling the loop element to the ground plane and the signal output, respectively, of the transceiver circuit.

Abstract: An RF transponder having an antenna comprising at least two ports operable to receive signals such that, in use, the signals in combination establish at least two current nulls on the antenna, each of the ports being located substantially at a current null.

Abstract: Meanderline loaded antennas having a wide bandwidth available for simultaneous or instantaneous use are disclosed. In one embodiment, the azimuthal angle of arrival associated with the antenna is provided by phase difference between signals at the RHCP and Vpol ports or by phase difference between signals at the LHCP and Vpol ports. In another embodiment, a quad meanderline loaded antenna is adapted to simultaneously provide four independent beams. Any beam direction can be synthesized by combining the independent beams.

Abstract: A housing for a tag assembly comprises an internal chamber defined by sidewalls and a bottom wall; a peripheral flange projecting from the housing; convergent surfaces extending at an upper housing end to an upper surface; and a sensor portal projecting through the housing upper surface in communication with the housing chamber. The housing is positioned within a mold block with the upper housing end resident within a mold block cavity. An upper surface of the peripheral flange and housing sidewall superior to the flange abut sidewall portions of the mold block to isolate the upper housing end with the cavity while carrier strip material is induced into the mold to partially embed the housing therein. An annular apparatus is thus formed comprising an annular carrier strip having a transponder housing at least partially embedded therein in which an upper housing end remains free of the carrier strip.

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.