Abstract: A radio transmitter and receiver is provided having an electrically acting antenna body in whose near region a dielectric body is arranged, with the dielectric constant of the dielectric body being varied by at least one control signal to ensure an optimum value for at least one physical variable representing a function of the transmission/reception quality of the radio transmitter and receiver.

Abstract: The antenna device includes a linear antenna (2, 11, 15), a fixing member (7), and a power feed member (10, 12, 14). The fixing member (7) is formed from a dielectric, and holds a portion (11) of the antenna. The power feed member (12, 10) contacts the antenna (11, 15). The fixing member (7) holds the antenna (2, 11, 15) in a movable manner.

Abstract: A composite antenna apparatus includes a cylindrical member 4 formed by a flexible insulating film rolled into a cylindrical shape, a plurality of antenna patterns 3 formed in a helix pattern on a peripheral surface of the cylindrical member 4, a circuit board 2 fixed to one axial end of the cylindrical member 4 and having a circuit pattern 10 connected to the antenna patterns 3 by soldering, and a monopole antenna 1 disposed inside the cylindrical member 4 and standing up on one surface of the circuit board 2. The circuit board 2 is provided with a first metallic pattern 8 having a predetermined area and formed on the one surface of the circuit board 2 at a position inside the cylindrical member 4.

Abstract: The present invention relates to vertical antenna systems (FIG. 1) employing an improved artificial ground system (10). In a resident frequency design, the ground plane system provided is in the form of a ground plane or diverging element (10). is provided with an efficient, economical and practical electrical conducting radial design (20). A low frequency design. Utilizing a fractional ground plane counterpoise. Folded at an fractional point, (10a) with respects to resident's frequency. At or about a right angle to the upper portion of the ground plane (diverging element (10)) forming a V type diverging element on it's side (>). Oriented with relevant, and beneficial length. To an opposing diverging element (10) in order to maximize gain emitted from the diverging elements, increasing radiation at lower angle's from antenna system (FIG. 1). That can incorporate a capacitance top hat (FIG. 3). Having similar to the diverging elements.

Abstract: Car antenna seat including a main body composed of two casings, a transparent antenna rod and a pivot rod. Several LED are respectively disposed on upper and lower faces of a fixing plate disposed in the main body. Transparent decorative boards are disposed on the casings, permitting light to pass therethrough. The transparent antenna rod is fixed on the main body. An antenna is fitted around the antenna rod. The pivot rod is pivotally connected with the bottom of the main body. A bulb set is disposed in a base of the antenna rod. The bulb set includes a color-changeable bulb and a controlling circuit board. The color-changeable bulb is controlled by the circuit board to flicker and change the color, whereby the transparent antenna rod can present different colors or flicker. By means of adaptable screw, the bottom end of the pivot rod is locked with a holder or fixing tray. The car antenna seat emits light to achieve a warning effect and a decorative effect.

Abstract: An antenna element is placed in a first mold for molding a first resin member including a plurality of protrusions, formed on an outer peripheral face of the first resin member and arranged with a fixed interval relative to a circumferential direction of the first resin member, and a tip end portion, having a cross sectional shape in which projected portions are arranged with a fixed interval relative to the circumferential direction of the first resin member. Insulating resin is injected into the first mold to form the first resin member The first resin member is placed in a second mold such that the protrusions are brought into contact with an inner face of the second mold. Insulating resin is injected into the second mold from a gate confronting the tip end portion of the first resin member, to form a second resin member coated on the first resin member.

Abstract: A structure of antenna is constructed by combination of a housing and a cover by means the ultrasonic welding process. The housing is a column structure and a plurality of long protruders are axially mounted on the outer surface of the housing. The cover is a hollow column structure having an opening at one end thereof and a plurality of long channels and weldlines are axially mounted on the inner surface of the cover, wherein an interference fit is formed between the long channels and the long protruders, and the weldlines are disposed in the interference region formed between the long channels and the long protruders.

Abstract: A telematic vehicle antenna for dampening low frequency vibrations includes a shaft adapted to be mounted on a vehicle, wherein the shaft has a longitudinal axis and an outer surface, the outer surface has a configuration that surrounds and extends generally parallel to the longitudinal axis, and the diameter of the configuration defines the diameter of the shaft. The antenna further comprises a conductor substantially enclosed by the outer surface and an air turbulence generator in contact with the outer surface for dampening vibrations transmitted to a vehicle by the shaft, wherein the air turbulence generator extends helically in a direction generally parallel to the longitudinal axis, and the air turbulence generator extends radially outwardly from the outer surface of the shaft by a distance greater than or equal to about 10% of the diameter of the shaft. A method of dampening low frequency vibrations associated with telematic antennas is also disclosed.

Abstract: A radio-frequency antenna for a magnetic resonance system has a basic element with two end rings and a number of antenna rods, and a radio-frequency mirror. The end rings are arranged concentrically relative to an antenna axis can and are axially offset from one another. The antenna rods are arranged around the antenna axis and connect the end rings. The radio-frequency mirror is inductively coupled to the end rings and the antenna rods. It limits a magnetic resonance excitation signal emitted by the antenna and/or a magnetic resonance signal received by the antenna axially at one side.

Abstract: A connection mechanism for snap-fitting an antenna into a hole in a receptacle, the receptacle typically being part of a 2-way mobile communication device. A latch, preferably mounted on a sleeve, including a stem and a latch head, extends around a circumference of the antenna. The latch is inwardly depressible to insert the antenna through the hole and is able to return to a non-depressed position to retain the antenna against the second end.

Abstract: A dual telescopic whip antenna, antenna system, and dual telescopic method are provided. The antenna comprises a radiator including a conductive wire, and a first telescoping tube section having a first end to accept the wire and an antenna port at a second end. The radiator also includes a second telescoping tube section having a first end to accept the other end of the wire. The radiator has an extended position length that is approximately equal to the sum of the wire length, the first tube length, and the second tube length. The radiator has a contracted position with the wire length substantially withdrawn in the first and second tubes. In some aspects, the antenna further comprises a chassis with a stopper channel assembly to accept the first and second tubes in the radiator contracted position and to limit the extension of the first tube from the chassis in the radiator extended position.

Abstract: An improved positioning structure of an inner coil for an antenna, wherein: an inner coil with a predetermined length and shape of the antenna is provided on the bottom thereof with a metallic receiving seat for placing in a die to be injected therein plastic material. The inner coil and the injection material have a downwardly extending shaping hole with a predetermined depth provided at the center of a top surface on the top thereof, in order to prevent the inner coil from deformation by injecting the plastic material in the die during injection shaping. The metallic receiving seat is further provided on the bottom thereof with an axial hole which is convenient for taking the product out of the die in a stable state in mass production.

Abstract: There is disclosed a structure of a rod antenna guide port in a cellular telephone comprising a rod antenna guide port for allowing a rod antenna in a cellular telephone to be pulled out therethrough with an inclination, the guide port including an upper and a lower sleeve hole for allowing the rod antenna to be inserted therein, the lower sleeve hole serving as means for pressing, when the rod antenna is pulled out, one side surface of a lower end portion of the rod antenna so that the rod antenna is offset to one side, thereby enabling to pulling out the rod antenna with an inclination through the upper sleeve hole, wherein the upper sleeve hole includes a slit sleeve composed of a plurality of slit elements annularly arranged, a split spring sleeve being externally fitted to the slit sleeve so that the slit sleeve can be expanded and contracted in a radial direction, the slit elements of the slit sleeve being pressed by the rod antenna pulled out with an inclination so that the slit elements are expanded (

Abstract: An antenna for a mobile communication terminal in which part of an antenna rod is slidably mounted into an assist antenna rod such that the antenna may be selectively extended in one or two stages. A connecting portion between the antenna rod and the assist antenna rod is rolled so that the antenna rod is prevented from being easily escaped from the assist antenna rod when the antenna is extended in two-stage. Thus, an enhanced communication quality may be obtained by extending the antenna length even when the mobile communication device is slimmed and an optimized length of the antenna is not secured.

Abstract: A slide lever (6) is provided to a cabinet (2) of portable radio equipment, and an antenna (3) formed by nickel elastic alloy is held by a holding member (5). A lower portion of the antenna engages with an engaging portion (61) of slide lever (6), and by sliding slide lever (6), the lower portion of antenna (3) is bent at engaging portion (61) such that the entire antenna is inclined in a vertical direction by a desired angle, thereby reducing loss due to nonconformity of polarization with respect to an antenna of a base station.

Abstract: A first radiator component and a second radiator component of a system serve to transmit information over a plurality of frequencies in a range that comprises one or more octaves less than or equal to thirty megahertz. The first radiator component comprises a major dimension that is less than or equal to nine meters. The second radiator component comprises a major dimension that is less than or equal to nine meters.

Abstract: An antenna which can be operated in a number of frequency bands and has at least one part which encloses an area and at least one part which does not enclose an area, with the at least two parts including a single conductor part being connected in series with one another, and the at least two parts interacting with one another in such a manner that the antenna has at least two resonant frequencies in a definable position, and with each at the same time having a wide bandwidth.

Abstract: A communication device operable in multiple frequency bands includes a branching antenna adapted to operate in at least two frequency bands. The antenna includes a first conductive element having a connection at one end for driving the antenna. The first conductive element is resonant at a first frequency. On the first conductive element, a feed point is located away from either end of the first conductive element, and particularly the driving connection point. A second conductive element is coupled to the feed point such that the second conductive element in conjunction with the portion of the first conductive element between the drive connection and the feed point is resonant at a second frequency. This allows for a more compact and versatile multi-band antenna.

Abstract: A radio apparatus is proposed which makes more flexible use of the antenna possible. The radio apparatus includes a case having a listening device on a first side and an antenna element in a second side opposite the first side. The antenna element is movably mounted on the second side of the case. The antenna element has a directional radiation characteristic in at least one first position and an omnidirectional radiation characteristic in at least one second position.

Abstract: A boot for an antenna assembly is disclosed. The antenna assembly includes an antenna mast having an antenna mast nut attached thereto, a tubular housing extending through an aperture in an automobile body, and a center conductor having a threaded stud attached at one end thereto received by the housing. The antenna mast nut is attached to the threaded stud, and an isolator is disposed between the housing and the center conductor. The boot includes a disk-shaped base member having a cylindrical recess and a first diameter formed from a lower surface thereof and a cylinder-shaped projection extending upwardly from an upper surface of the base member. The projection includes a bore having a second diameter smaller than the first diameter formed therethrough. The base member is operable to seal an upper surface of the isolator, a side surface of the isolator and an outer surface of the housing. The projection is operable to seal an outer surface of the center conductor.

Abstract: A retractable/extendable antenna for portable radio device is provided, which expands the bandwidth for the operating frequency of 1.5 GHz. This antenna comprises (a) a casing; (b) a first linear antenna element attached retractably or extendably to the casing; the first element being located outside the casing and fed with electric power to be active in the extended state while located inside the casing and fed with no electric power to be inactive in the retracted state; and (c) a second linear antenna element shorter than the first element, which is connected mechanically to one end of the first element and disconnected electrically therefrom; the second element being located outside the casing and fed with no electric power to be inactive in the extended state while located outside the casing and fed with electric power to be active in the retracted state. The first and second elements may be electrically connected to each other.

Abstract: An antenna construction for wireless telephones and the like. The antenna is capable of concentrating electrical fields near one or more antenna points. One antenna construction may have a terminus configured to form a sharp point so that it has a surface diameter that is substantially less than the diameter of the antenna itself. Another construction may use a multi-ended construction, including a number of individual bristles whose terminus will concentrate electrical fields because of its small size. Another construction may be a unitary antenna construction comprises a plurality of elongate arms radiating out from a center. One longitudinal edge of each of the arms is serrated or saw-like, forming the multiple points or ends at which electrical fields may concentrate. The arms are then creased and folded together to form the antenna.

Abstract: An on-vehicle rod antenna device comprises an antenna rod, and an antenna base comprising a joint section to which the antenna rod is connected, in which the joint section comprises a tip portion, the tip portion is covered with the antenna rod in a state of connecting the antenna rod, and a substantially hemisphere recess or salient engaging with an inner circumferential surface of the antenna rod is formed on an outer circumferential surface of the tip portion.

Abstract: A duplexer 24 comprising substantially semi-cylindrical filters 1 and 5 is disposed in and made integral with an increased diameter hollow stem part 29 of a substantially rod-like antenna element 22. The two filters 1 and 5 are coupled together by a coupler substrate 8 interposed between them. The coupler substrate 8 is disposed between the two filters 1 and 5 for forming a connector 23, which is connected to the antenna element 22. This assembly is connected by connector pieces 25 to 27 to a transmitter and a receiver part of a radio part of a portable telephone set or the like.

Abstract: A retractable antenna system is disclosed that enables electronic devices to engage in wireless communication. A preferred embodiment includes a retractable antenna disposed within a cavity in the electronic device and an actuating mechanism for selectively extending and retracting the antenna from within the cavity. The antenna system is preferably disposed within the housing of a communications card such as a PC Card. The retractable antenna may be rigid or flexible, and may be a single piece design or telescopic. The antenna system may also include two or more retractable antennas, a light source attached to the antenna, a control mechanism used to determine antenna functionality based on the positioning of the antenna, and the retractable antenna may be connected modular portion of the communication card.

Abstract: An extendible antenna (10) includes an antenna rod (11) attached to a hinge (13) for rotational movement about a transverse axis (15) of the hinge (13). The hinge (13) is fitted within a housing (14) and is slidingly moveable therewithin. When the antenna rod (11) and the hinge (13) are in a fully extended position, the antenna rod (11) is pivotally rotatable relative to the housing (14) from a center position to either of two opposite end positions.

Abstract: An expandible antenna device comprising an expandable shell defining an interior chamber, wherein the shell is radially expandible from a central axis within the chamber; an elongated support structure disposed along the central axis and at least partially within the chamber; and an antenna element coupled to the shell such that the antenna is dimensionally stable when the shell is in an expanded position is disclosed. Additionally, an antenna element comprised of conductive elements joined by fluid filled bulbs or tubes wherein the fluid is capable of ionization is also disclosed.

Abstract: A system and method for mounting a slightly longer than ¼ wavelength whip antenna to a ground plane with an integrated electrical impedance match which uses a brass disk, threaded to the bottom portion of the whip and which is isolated for ground plane by a Delrin® acetal resin spacer, to provide a shunt capacitance.

Abstract: A transceiver includes a body, a first antenna fixed to the body, a bar antenna, an insulating section coupled to the bar antenna and a second antenna coupled to the insulating section. The bar antenna can be accommodated in the body. The first and second antennas are electrically connected to form a third antenna when the bar antenna is accommodated in the body.

Abstract: An antenna device for a radio communications apparatus operating in dual frequency bands and having one antenna element (18, 23) for each of the frequency bands. The antenna elements are included in a rod-shaped arrangement and are disposed in line with one another. The antenna element (18) which is intended for the higher frequency band is galvanically coupled to the circuits in the radio communications apparatus and is designed as a rod or bar antenna (18). The antenna element (23) for the lower frequency and is a helix, whose one end portion (24) surrounds an end portion of the rod or bar antenna (18). The antenna elements (18, 23) are capacitatively coupled to one another so that the helix constitutes a capacitative top load to the rod or bar antenna (18).

Abstract: An antenna protection device for insertion between sections of an antenna for cutting the passage of low-frequency alternating electric current. The device comprises a non-linear capacitor with capacitor plates connected to the antenna sections. The non-linear capacitor is characterized by a negative low-frequency voltage coefficient, whereby the passage of a high frequency alternating current remains essentially unaffected.

Abstract: In a monopole antenna, an antenna element is fitted into a dielectric body having a predetermined relative dielectric constant. A wavelength of a propagation wave is shortened by the shortening coefficient of wavelength which corresponds to the predetermined relative dielectric constant of the dielectric body. In this case, the antenna length of the antenna element can be shortened, so as to be equal to the shortened wavelength or 1/n of the shortened wavelength, “n” being integer. Thus the monopole antenna is small-sized.

Abstract: A frequency adjustable radio antenna attachable to an exterior portion of a motor vehicle has an effective resonant wavelength which may be varied from a remote location; e.g., a transceiver located within the vehicle, to selected values includes a hollow conductive base mast electrically insulated from a mounting bracket and a radio frequency connection to a transceiver, an elongated hollow cylindrical coil housing attached coaxially to the upper end of the base mast and an upper circular cap attached to the upper end of the coil housing in coaxial alignment therewith. The housing is made of an electrically non-conductive material and has formed in inner cylindrical wall surface thereof an elongated helical groove which holds a tuning coil coaxially enclosing a disk-shaped commutator which has a resilient outer surface longitudinally slidably contactable with inner conducting surfaces of convolutions of the coil.

Abstract: A device for providing wireless communication is disclosed. The device includes a retractable antenna connected to modem and PC card. The retractable antenna has a locking mechanism for providing a snap lock to maintain the antenna in the extended position during ordinary use and allowing retraction of the antenna by force when not in use. The retractable antenna has an antenna sleeve which receives the antenna and locks the antenna in the extended position. The antenna also has a pivotal connection for pivoting the antenna and a rotatable connection for rotating the antenna in a direction which differs from the direction of rotation. The antenna is rotatable about two axes and is retractable. In the extended position, the antenna is electrically connected with the PC card and can receive and transmit signals.

Abstract: An antenna apparatus for a communication device operating in the frequency range of between 800 and 3000 MHz, comprises at least one radiator (1), which is galvanically connected to one end of a spiral conductor (2). This is, in turn, connected to a transceiver (4). An earthed conductor (6) extends along the extent of the spiral (2) to form a capacitance therewith distributed along the spiral.

Abstract: The invention relates to a transceiver, in particular a telephone for mobile networks, including a metal or screened casing, an antenna support mounted on the casing at one end and an antenna mounted on the other end of the antenna support, which has a physical or electrical length substantially equal to one quarter of the wavelength of waves emitted by the antenna. The invention improves the efficiency of the link.

Abstract: An external thread portion of an antenna holder (12), mounted on an antenna body (11), is connected to an internal thread portion of an antenna holder-receiving member (15) provided on an antenna guide (18), and in this connected condition, an antenna is passed through an antenna body passage hole (17) formed in a casing (13). Then, a fastening member (19) is mounted in a fitting portion (20), which is formed in the casing (13) so as to fix the antenna, and is disposed in the vicinity of the antenna body passage hole (17), thereby fixing the antenna. Therefore, the antenna can be mounted and fixed without using much labor and time.

Abstract: A method for manufacturing an antenna unit, including a resilient, metallic core (10), which is in the form of a wire, and an injected, insulating jacket at least partially enclosing the core, wherein use is made of an injection moulding tool, which is split in a parting plane (D), containing the longitudinal, central axis of the core. The insulating jacket is injection moulded in two steps. The core is in a first step provided with a first jacket portion (15), while the remaining part of the core is supported in a first mould cavity portion (11B), which is adapted to the shape of the core. At least a part of the injection moulding tool and the core with the injected first jacket portion are displaced in relation to each other.

Abstract: An antenna assembly (100) includes an antenna (114), antenna mounting base (108), and a radio housing (102). The antenna mounting base (108) includes a through-hole (112) and a snap beam (116). The antenna (114) is inserted into the mounting base (108) via the through-hole (112), and the mounting base snap fits into the radio housing (102) via the snap beam (116). The snap beam (116) operates as both a snap-fit feature for retaining the antenna mounting base within the housing ((102) and as a release mechanism for removing the antenna mounting base from the housing.

Abstract: A filling level measuring device operating with microwaves and to be fastened on a container (3) is provided, the device having a housing (11) and a rod-shaped antenna (7) pointing into the container (3) and the device being designed such that the antenna (7) does not transmit or receive microwaves in the region of a measuring device fastening and the transmitted power is not impaired by condensate or moisture. According to a first solution variant, the antenna (7) is fastened in the housing (11) and a section of the antenna (7) in the region of the measuring device fastening is surrounded by a metallic sleeve (8). According to a second solution variant, a sleeve (8a) in which the antenna (7) is fastened is formed onto the housing (11).

Abstract: An antenna assembly (35) mounted to a mobile communication set by a holder (61) to be retractable therein and extendable therefrom comprises a whip antenna (51) having a contact (57) and a helical antenna (43) joined with each other through an insulator joint member (39). The holder (61) is connected to a transceiver circuit in the set. In an extended position, the whip antenna (51) is fed from the transceiver circuit through the contact (57) and the holder (61). A conductive sleeve (49) is connected to the helical antenna (43) and mounted on the joint member (39) to be in contact with the holder (61) in the retracted condition whereby the helical antenna (43) is fed by the transceiver circuit. The joint member (39) is fixed at opposite end portions to the whip antenna (51) and the sleeve (49) with an intermediate portion left therebetween and having an axial length selected from a range of 4 and 7 mm.

Abstract: The present invention discloses antenna structures for portable digital devices that continuously receive radio signals in both the extended and the retracted antenna positions. In addition, the disclosed antenna structures tune the antenna based on the position of the antenna to achieve good impedance matching, which is particularly useful in reducing the noise and interference, while maximizing the available power for radiation from the portable digital devices. More specifically, a multiple position stylus antenna is disclosed that incorporates an antenna into a stylus for use with a Personal Digital Assistant (PDA). The stylus antenna uses one radiating element tuned for optimal performance in the extended position and synthesizes a compensation impedance to match the impedance of the feeding transmission line in the retracted position.

Abstract: Insulating-resin-made attachment part 13A is equipped with connection terminal 10 electrically connected to antenna element 3, and connection terminal 10 is directly connected to a prescribed circuit of a radio machine. As a mounting means to the radio machine, snap part 9 having a metal part projecting out of the sidewall of attachment part 13A is disposed.

Abstract: A switched, dual helical, retractable, dual band antenna for a cellular communication device comprising a device which functions at two specific frequency bands when in the retracted mode and which functions at two specific frequency bands when in the extended mode. The antenna includes an elongated radiator which is in circuit when the antenna is in its extended position and includes inner and outer helical radiators which are in circuit when the antenna is in the retracted mode.

Abstract: A holder is eliminated when installing an antenna to a radio case, the installation operation is simplified, and a feeding mechanism is improved. A slit is provided in a stopper of an antenna so that the outer diameter can be reduced, and the antenna is inserted directly into a cylindrical section of the radio case from the bottom of the stopper. A plate-like feeding spring is provided at the cylindrical section, and is directly attached to a connection point of a circuit substrate of a radio; one end of the plate-like feeding spring pressingly contacts the side of the stopper of the antenna, thereby forming a feeding mechanism.

Abstract: In an antenna assembly (10) including a whip antenna (1, 9) provided with a stopper (5) of a conductive material at a lower end of the whip antenna, a helical antenna (2) provided with a conductive sleeve (6) mounted on a top end of the whip antenna, and a holder (4) of a conductive material for slidably holding the whip antenna, each of the stopper, the conductive sleeve, and the holder is of a light metal having a specific gravity not greater than 3 g/cm3. The holder is electrically connected to the stopper when the whip antenna is in an extended position. The holder is electrically connected to the conductive sleeve when the whip antenna is in a retracted position. The light metal may includes at least one of aluminum and magnesium. Alternatively, the light metal essentially consists of 0.4% or less Si, 0.7% or less Fe, 5.0-6.0% Cu, 0.30% or less Zn, 0.2-0.6% Bi, 0.2-0.6% Pb, and the balance Al in weight.

Abstract: A switched, dual helical, retractable, dual band antenna for a cellular communication device comprising a device which functions at two specific frequency bands when in the retracted mode and which functions at two specific frequency bands when in the extended mode. The antenna includes an elongated radiator which is in circuit when the antenna is in its extended position and includes inner and outer helical radiators which are in circuit when the antenna is in the retracted mode.

Abstract: An extendable antenna for a personal computer card uses two main antenna elements. A movable antenna element can be positioned in an extended position such that the base of the second antenna element electrically contacts the top of the other antenna element. The antenna in the extended position is connected to the antenna port through matching circuitry. In a closed position of the antenna, the second antenna element is electrically connected to the antenna port bypassing the matching circuitry. In one embodiment, the antenna is a quarter-wave length antenna in the closed position and a half-wave length antenna in the extended position.

Abstract: The antenna hold device comprises a transmitting and receiving antenna which can be stored within the main body portion of the antenna hold device, and a cylindrical-shaped antenna guide for guiding the main body portion storage side of the transmitting and receiving antenna. And, the present antenna hold device is characterized by clearance eliminating means which, when the transmitting and receiving antenna is guided to and stored in the main body portion storage side of the antenna hold device, eliminates a clearance between the above-mentioned antenna guide and the leading end of the main body portion of the transmitting and receiving antenna. Thanks to this structure, there can be obtained an effect that, even when there arrives a receiving call through vibrations, no vibration can be produced in the leading end of the antenna main body portion and thus no strange sound (irregular sound) can be generated.

Abstract: An antenna apparatus for a mobile terminal is provided having a hula hoop antenna secured to a housing of the mobile terminal; a conductive line coupling the hula hoop antenna to a transceiver of the mobile terminal; a conductive fixing member having a through hole and contacting a portion of the hula hoop antenna; a cylindrical fixing member inserted into the through hole of the conductive fixing member; and a rod antenna extendable and retractable from and into the housing. The rod antenna is movable along a central axis of the cylindrical fixing member. The hula hoop antenna has a first end connected to a variable capacitor on a printed circuit board of the mobile terminal and a second end connected to a ground plate of the printed circuit board.