Abstract: A low-complexity, high accuracy model of a CPU anti-resonance system has been developed. The model includes a simulated load model, a simulated transistor that simulates the performance of a high frequency capacitor, and a simulated capacitor that simulates the performance of an intrinsic capacitance of a section of the microprocessor. All of the elements of the model are connected in parallel.

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: The antenna includes four elements excited with equal amplitudes but with a relative phase difference of 0°, ?90°, ?180°, and ?270°. Each element includes a vertical and horizontal portion. An RF trap filter is located within the horizontal portion so that the antenna provides good gain coverage at all three frequency bands of a modernized global positioning system.

Abstract: A frequency modulation antenna includes: a hermetically sealed driver assembly, which includes a driver tube, a gamma tube, a spacer stamping between the driver tube and the gamma tube, and an impedance matching block assembly between the driver tube and the gamma tube. The antenna eliminates conventional sources of signal degradation and interference due to its bi-directional nature, the hermetic sealing of the driver assembly, the coupling methods that prevent corrosion, and the dielectric coating. The antenna is further mounted to provide strength against the elements, facilitated by the precise mating of the driver assembly, the impedance matching block assembly, and a cleat to the mounting block, and the engagement of the teeth of the cleat and the serrations of a U-bolt to a pole. The antenna is significantly smaller than many conventional antennae while still being able to receive signals of low power without undue degradation or interference.

Abstract: The present invention relates to an antenna equipped in a mobile telecommunication apparatus such as a portable telephone. The object of the invention is to enhance the portability and the durability of the mobile telecommunication apparatus, to provide a mobile telecommunication antenna while is improved in the mass productivity and the electrical characteristics, and to provide a mobile telecommunication apparatus employing the antenna. To achieve the object of the present invention, the mobile communication apparatus has no projecting portion of the antenna provided on a case, and the antenna is accommodated in the case. This enhances both the portability and the durability. Also, the antenna is reduced to a chip size thus improving its mass-productivity and electrical characteristics.

Abstract: A split monopole antenna that provides for simultaneous transmission of 121.5, 243 and 406 MHz emergency signals using a simple, lightweight structure that can be stowed in an aircraft in a compact manner during non-deployment, and after deployment enables the beacon to float in water in an upright orientation. The monopole antenna comprises three radiating elements. The first radiating element is electrically coupled to a transmitting unit and radiates a 406.025 MHz signal; the second radiating element is electrically coupled to the first radiating element by way of a first band rejection filter and both elements radiate at 243 MHz; and the third radiating element is electrically coupled to the second radiating element by way of a second band rejection filter and all three elements radiate at 121.5 MHz.

Abstract: The invention concerns detachable whip antennae with capacitive load wherein the load does not need to contribute to the antenna mechanical strength. To achieve this, the entire load (3) is inserted in the conductor strand (2f-21-33-32-2n) of a radiating segment of the antenna, the mechanical strength being provided by a hollow plastic insulating tube (20) reinforced with glass fibres, which acts as support for the conductor strand and as housing for the load and said load consists of a metal enclosure (33) wherein penetrates the insulated part of an electric cable (32). The invention is particularly applicable to whip antennae designed for mobile stations.

Abstract: A multiplexer circuit adapted to receive signals comprises two filter circuits. The first filter circuit presents a high impedance to signals outside a first frequency range and the second circuit presents a high impedance to signals outside a second frequency range. Isolation matching circuits enable transmission and reception of one of the signals in the first or second frequency ranges without degradation or interference with the other range. An embodiment allows transmission and reception of satellite Orbcomm frequencies over a standard AM/FM antenna without effect on the AM/FM signal.

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: An antenna for a mobile communication device, the antenna comprising a housing; a first resonator element with a first feed point having a first resonant frequency; and a second resonator with a second feed point having a second resonant frequency, wherein the housing has an outer portion supporting the first resonator element and an inner portion supporting the second resonator element, the inner portion being positioned within the outer housing such that the first and second feed points are coupled to provide a feed point for the antenna thereby allowing the antenna to operate with the first resonant frequency and the second resonant frequency.

Abstract: Dual-band retractable radiotelephone antennas have an elongated antenna element, a top load element, and a trap positioned between and electrically connected to the elongated antenna element and the top load element. The trap facilitates obtaining half-wave monopole performance at a first frequency band and half-wave monopole performance at a second higher frequency band.

Abstract: A multiple frequency band antenna for a communications device, such as a radiotelephone, includes a dielectric substrate having high and low frequency band radiating elements disposed on a surface thereof. The high and low frequency band radiating elements have meandering patterns and are electrically connected to a feed point. Lumped electrical elements are electrically connected in series between the high and low frequency band radiating elements at the feed point to reduce coupling effects between the high and low frequency band radiating elements.

Abstract: A multi-element radio antenna assembly is described. The antenna assembly includes a ground plane element having an array of conductor elements disposed thereon. A pair of LC trap structures provide dual band resonance for cellular telephone and PCS device bandwidth ranges. Additional performance may be achieved with parasitic reflector and director elements. The multi-element directional antenna finds particular applicability for in-vehicle use.

Abstract: A disk-shaped conductor 22, a ring-shaped conductor 24 and a ring-shaped conductor 26 are arranged in that order on the same plane. One end of a linear conductor 21 is connected perpendicularly to the center of the disk-shaped conductor 22, and the outer edge of the disk-shaped conductor 22 is connected to the inner edge of the ring-shaped conductor 24 via an anti-resonance circuit 23. Moreover, the outer edge of the ring-shaped conductor 24 is connected to the inner edge of the ring-shaped conductor 26 via an anti-resonance circuit 25.

Abstract: A parasitic antenna array (Yagi-Uda or loop type) for multiple frequency bands has its driven and parasitic elements interlaced on a single support boom. In a first aspect of the invention, series resonant circuits are located in one or more parasitic director elements in order to minimize the deleterious mutual coupling effect between directors of different frequency bands. In a second aspect of the invention, an inductance is placed across the feed point of the driven element of one or more non-selected frequency bands in order to minimize the bandwidth narrowing effect of closely-spaced driven elements and to provide a desired feed point impedance at the driven element of the selected frequency band. Although the two aspects of the invention may be used without one another, they are advantageously employed together. In addition, the second aspect of the invention may be applied to closely-spaced driven elements that are not part of a parasitic array.

Abstract: An AM/FM/CB/cellular telephone antenna includes a first frequency self-resonant circuit at a position above the lower end of the antenna such that the electrical length of the lower section of the antenna is equivalent to one-quarter wavelength for a frequency in the FM frequency range and a second frequency self-resonant circuit disposed below the first frequency self-resonant circuit. The first self-resonant circuit presents a high impedance in the FM frequency band and the second self-resonant circuit presents a high impedance in the cellular frequency range. The entire length of the antenna is equivalent to one-quarter wavelength in a frequency in the CB frequency band. The antenna wire is wound around a fiberglass core, and the FM self-resonant circuit is formed by a tightly wound, coiled section of the wire together with a thin-walled brass tube extending over the core in the area of the tightly wound section.

Abstract: A chip antenna 10 includes, inside a rectangular-parallelepiped base 11 having barium oxide, aluminum oxide, and silica as main constituents, a conductor 12 wound in a spiral form along the length direction of the base 11, and an LC parallel resonance circuit 13, which is inserted in the intermediate portion of the conductor 12 and which is connected electrically in series with the conductor 12, and includes, on the surface of the base 11, a power-feeding terminal 14 for applying a voltage to the conductor 12. The conductor 12 is separated into a first conductor 121 and a second conductor 122 by the LC parallel resonance circuit 13. The LC parallel resonance circuit 13 is formed of a coil L1, which is an inductance element, and a capacitor C1, which is a capacitance element, which are connected in parallel.

Abstract: Each transmitter/receiver pair of a radio base station is connected via an antenna bus and radio frequency feeder to antenna near parts equipment such as active antennas, boosters and tower mounted amplifiers. Automatic configuration and calibration of the antenna near parts equipment is accomplished by establishing communication between the base station and each of its connected antenna near part components. Each antenna near part component sends its identification to the base station over the antenna bus at power-on. Furthermore, communications selectively sent over the radio frequency feeder are monitored to determine the connectivity between individual transmitter/receiver pairs of the base station and each antenna near parts equipment. These radio frequency feeder communications are further processed to determine calibration data for configuring each antenna near parts equipment for optimal operation.

Abstract: A dual band antenna with a simple and compact structure includes an inductor, first and second rod-like radiating elements connected to opposite ends of the inductor, with dielectric material surrounding both the inductor and the joining portions of the first and second radiating elements on the respective ends of the inductor. A conductive housing surrounds the dielectric and supports the inductor and the joining portions of the first and second radiating elements. The housing and dielectric create a capacitance, so that an LC resonant circuit is formed in conjunction with the inductor. The LC circuit is designed such that only one radiating element radiates at the higher band of the dual operating band, whereas both radiating elements radiate at the lower band.

Abstract: The invention provides an antenna device, comprising: an antenna body including a conductor, an equivalent circuit of said conductor comprising an inductive component and a resistive component in a series connection, wherein a frequency adjusting circuit including at least a parallel circuit of a switching element and a passive element is connected to said conductor of said antenna body. The antenna body is connected in series with said frequency adjusting circuit.The invention enable to provide a compact antenna device for use in a mobile communication apparatus that performs transmission and reception on frequencies in a wide range.

Abstract: A multiband antenna comprises an antenna device which is resonant at two or more different frequencies. The antenna device comprises a first antenna rod (7), a second antenna rod (8), and a distributed-constant dielectric resonator which is a coaxial dielectric resonator (1A) comprising a dielectric block (1A1). The first antenna rod (7) is electrically connected to an inner conductor (4) covering the inner surface of the dielectric block (1A1). The second antenna rod (8) is electrically connected to an outer conductor (5) covering an outer periphery of the dielectric block (1A1). In another structure, the dielectric resonator is a triplate dielectric resonator (1B) comprising two dielectric plates (1B1). The first antenna rod (7) is electrically connected to a center conductor (6) interposed between the dielectric plates (1B1). The second antenna rod (8) is electrically connected to outer conductors (5) covering the dielectric plates (1B1) at the side opposite to the center conductor (6).

Abstract: A dual band antenna assembly is described to include a pair of dual band active radiating elements disposed upon a dielectric substrate. A pair of LC traps and conductor elements are electrically coupled to the radiating conductor elements to provide dual band resonance for cellular telephone and PCS device bandwidth ranges. Additional performance may be achieved with parasitic reflector and director elements. The multi-element directional antenna finds particular applicability for in-vehicle and wireless communication use.

Abstract: A portable communication system includes a first metal housing for containing a high frequency circuit unit such as a transmitting circuit and a receiving circuit, a second metal housing for containing a low frequency circuit unit such as a control circuit, and also an antenna mounted on the first metal housing. An antenna apparatus for this portable communication system is arranged by the above-explained antenna, first and second metal housings, and also a control element for controlling distribution of high frequency currents flowing through the first and second metal housings. An antenna radiation pattern of this antenna apparatus can be optimized by controlling an impedance of the control element.

Abstract: An improved antenna for use with a hand-held, portable cellular telephone in the 800 to 900 megacycle range for greatly increasing the range and signal efficiency of transmission and receipt, eliminating dead spots, and for reducing or eliminating ground radiation on the user while the device is being used, wherein the antenna includes matched input impedance, a resonance circuit of capacitance and inductance, and a high impedance connected to the end of the antenna radiating element. The high impedance allows the device to be voltage-fed from a single element, altering the radiation pattern both for transmission and receipt.

Abstract: A balanced bandpass preamplifier assembly (23) is disclosed for use in a locator (10) for locating a beacon transmitter (18) housed within an underground boring device (12). The bandpass preamplifier assembly (23) includes a balanced bandpass filter (28) of the Butterworth type with second order filter characteristics. The preamplifier assembly (23) provides reception of beacon frequencies at two distinct frequencies, preferably 29.430 KHz and 32.768 KHz. The antenna (14) of the . locator (10) forms the series inductance in the bandpass filter (28).

Abstract: A system of antennas for conserving space and concealing the separate identity of the individual antennas. The antennas may be a radio antenna and a telecommunications antenna. The antennas may have a common base to eliminate separate wires and holes in the vehicle on which they are mounted. The antennas may be housed within the same casing to protect them from the elements and from other harm.

Abstract: An improved broadband off-center fed dipole antenna, the Smithdom antenna, capable of resonating at multiple frequencies with a near integer relationship between fundamental and harmonic frequencies and with standing wave ratio of less than or equal to 2:1 at desired frequencies without the need of an antenna tuning device. The antenna comprises a first radiating section having an inner line electrically coupled to a balun transformer and a trap and an outer line electrically connected to a trap and an insulator. A second radiating section is connected to the balun transformer and has another insulator secured to its other end.

Abstract: A physically short broad-bandwidth multiband vertical antenna with 50 ohm input impedance and 25 foot square footprint for 160, 80, 40 and 17 meter radio bands. Low ohmic resistance due to the small physical size combined with system impedance transformation and capacitive input coupling provide radiation resistance corresponding to an efficiency of about 85 percent. The 2:1 SWR bandwidth is 50 kHz on 160 meters and 87 kHz on 80 meters. A 30 foot mast, top hat capacitive load, and a plurality of parallel vertical skirt wires depending from the top hat around the mast are electrically connected together at the top of the mast. An impedance transforming multi-tap coil is connected between mast and ground. Skirt wires are in two sets separately fed at their lower ends by separate coaxial cable coupling capacitors for operation on different bands. A 50 ohm feed line, skirt wires, coupling capacitors and impedance transforming coil all have terminal connections on a mast-base insulator.

Abstract: The invention provides an efficient, broadband, antenna system for RF communications. The benefits of the invention include: a single integrated system for total band coverage; high system efficiency across the operating band; multiple instantaneous transmit and receive signal capability; and simple mechanical assemblies. The invention includes various configurations of multiple transceivers connected to a set of RF filters and associated impedance matching networks which are used to excite a plurality of trapped antenna elements. The new antenna system, offers control over the antenna's directivity and the antenna's driving point impedance by using sub-band systems as defined by a series of RF filters and traps which divide the physical antenna elements into various radiating lengths. Continuous coverage over the entire frequency band of interest is achieved by using different physical antenna elements for adjacent sub-bands.

Abstract: A diversity antenna for radio communications including a pair of conductive thin-film patterns used for a first antenna and another pair of conductive thin-film patterns used for a second antenna, the thin-film patterns being installed on a printed circuit board along the direction of the length of the circuit board; a first choke coil which is used to stop a leakage current from the first antenna and cause attenuation of a coupling current from the second antenna, the first choke coil being installed at a location where the leakage current distribution of the first antenna reaches the maximum in a feeder cable connected to the first antenna; and a second choke coil which is used to stop the leakage current from the second antenna, the second choke coil being installed at a location where the leakage current distribution of the second antenna reaches the maximum in a feeder cable for the second antenna.

Abstract: An AM/FM/CB/cellular telephone antenna includes a first frequency self-resonant circuit at a position above the lower end of the antenna such that the electrical length of the lower section of the antenna is equivalent to one-quarter wavelength for a frequency in the FM frequency range and a second frequency self-resonant circuit disposed below the first frequency self-resonant circuit. The first self-resonant circuit presents a high impedance in the FM frequency band and the second self-resonant circuit presents a high impedance in the cellular frequency range. The entire length of the antenna is equivalent to one-quarter wavelength in a frequency in the CB frequency band. The antenna wire is wound around a fiberglass core, and the FM self-resonant circuit is formed by a tightly wound, coiled section of the wire together with a thin-walled brass tube extending over the core in the area of the tightly wound section.

Abstract: A dual-band antenna system for use in a portable communications device is disclosed herein. The antenna system includes an antenna element for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a low-band isolator network, coupled to the antenna element, provides signal isolation between high-band and low-band signal paths during high-band operation. Similarly, a high-band isolator network provides signal isolation, during operation over the low-band range of wavelengths, between the high-band and low-band signal paths. During transmit and receive operation, low-band and high-band electromagnetic energy directed through the antenna is passed by the low-band and high-band isolator networks, respectively. Also included are low-band and high-band matching networks which couple the low-band and high-band isolator networks to low-band and high-band transceiver circuitry.

Abstract: A variable capacitance antenna allows individual adjustment of linear resonators on a beam antenna. A linear resonator is associated with each dipole element on a common support boom. A variable capacitance is positioned inside the boom and created using an arrangement of two coaxial conductive tubes as capacitive plates. One of the conductive tubes may be axially moved by a motor using a remote drive control. The movement of one conductive tube relative to the other can vary the capacitance from 0 to 100 picofarads, for example. The variable capacitance antenna can be used for both horizontal and vertical signal polarization applications. Such a variable capacitance antenna can receive and transmit electromagnetic signals on multiple frequency bands and in between frequency bands with high gain, high directivity, high efficiency, and low wind loading.

Abstract: A combination antenna for aircraft and the like capable of transmitting and receiving VHF signals and receiving GPS signals comprising a VHF monopole antenna assembly and a GPS patch antenna assembly located within a common aerodynamically shaped dielectric housing. Separate connectors connect coaxial cables to the two assemblies and assembly elements are provided to suppress cross coupling of signal harmonics and noise from the transmitted VHF signals to enhance isolation of the received signals for the GPS and VHF functions. No adding or separation of the VHF and GPS signal information is required and the low patch antenna profile enables a low and aerodynamically shaped antenna for the beneficial use on small aircraft.

Abstract: A wide-banded mobile antenna enhancing signal transmission by broadening the effective transmission bandwidth. The wide-banded mobile antenna is interchangeable with currently existing mobile antennas as the two use connectors established by industry. An antenna matching network is situated within a protective housing having a metal shield. A toroidal inductor is serially connected with the antenna and creates a parasitic capacitance with the metal shield. The resulting network, including the antenna, is tuned. An antenna compensating network increases the bandwidth of the antenna with a parallel resonance network. The parallel resonance network has a capacitor and an inductor connected in parallel to the antenna and each other. The parallel resonance inductor is oriented so that the fields it generates are perpendicular to those of the antenna and the matching inductor to prevent coupling between the inductors.

Abstract: A high-power broadband antenna comprises an impedance matching transformer electrically coupled to a radio frequency source generating an input signal having a base wavelength corresponding to the lowest frequency of the input signal. The impedance transformer is electrically coupled to at least two vertical antenna sections. Each antenna section comprises a plurality of substantially collinear electrically conductive radiating elements fixed to an electrical insulator mounted on a horizontal ground plane. Each radiating element has a length appropriate to effect optimum overall efficiency of the high-power broadband antenna over the frequency bandwidth of the input signal. At least two loading elements are each electrically coupled between the radiating elements in each antenna section. Each loading element comprises a parallel combination of a resistor, an inductor, and a capacitor to effect optimum overall efficiency of the high-power broadband antenna over the frequency bandwidth of the input signal.

Abstract: A broadband off-center fed dipole antenna capable of resonating at multiple frequencies with a near integer relationship between fundamental and harmonic frequencies and with standing wave ratio of less than or equal to 1.5:1 at desired frequencies without the need of an antenna tuning device. One preferred embodiment of the antenna comprises a first radiating section having an inner line electrically coupled to a balun transformer and a trap and an outer line electrically connected to the trap and an insulator. A second radiating section is connected to the balun transformer and has another insulator secured to its other end.

Abstract: A deployable antenna assembly includes a canister providing an elongated mber and an elongated hollow mast with a mounting member on its upper end. A coaxial cable extends into the hollow mast to provide radio signals to the antenna assembly of four antenna members of resiliently deflectable members spaced at 90 degree intervals about the periphery of a mounting plate. In the non-deployed position elongated arms extend downward along the inner wall of a canister. A resonant circuit having an inductive coil and a capacitor are located at an intermediate position on the arms. A smooth material is placed between the resonant circuit and the wall of the canister to prevent scraping and damage to the resonant circuit upon deployment. Each opposed pair of antenna element comprises a dipole. A pair of baluns are formed by the arrangement of coaxial cable. A hybrid circuit forming a phase shifter is securely affixed to a mounting plate.

Abstract: A monopole radiating blade antenna comprising a driving, high impedance stub mounted to the face of the blade that functions as part of the radiator as well as part of a shunt path between the blade and the base plate. The shunt path is completed by an air coil inductor connected between the center conductor of the stub and the base plate. One embodiment provides the input connector wire and stub in vertical alignment along the center vertical axis of the blade. Another embodiment arranges the stub to be off-set from the input wire. Some advantages over conventional blade antennas include increased gain at low angles of elevation above the horizon, good impedance match over a wide range of frequencies without using conventional 1/4 wave length stub matching that can introduce dielectric losses, low resistance to ground to bleed off static electricity and lightning, non-loading of the high impedance path at design frequencies, and good accommodation of 5/8 wavelength radiator blade dimensioning.

Abstract: A roof antenna capable of receiving three kinds of bands, i.e., a FM radio band, an AM radio band, and a wireless-telephone band, includes an antenna element 10 having a structure that a conductor 15 winds around the insulator 16 in the form of a coil. A molded portion 14 is formed at the bottom of the antenna element, in which a trap coil is inserted. The electric length from the antenna top 11 to the internal metal fitting 17 at the lower end of the antenna element 10 is about a quarter of a FM radio wave. The electric length from the internal metal fitting 17 to the lower end of the trap coil 12 is about a quarter of a wireless telephone wave. A cover 19 supporting a basal part of the antenna element installs the first substrate 20 and the second substrate 21. The first substrate 20 and the second substrate 21 have a matching circuit, branching filters, and amplifiers.

Abstract: A three-wave antenna for vehicles which includes a monopole antenna element which has an electrical length of approximately 1/4 of the wavelength in the FM broadcast band along with a double sleeve used to prevent current flow and with a second double sleeve used for phase adjustment that are installed coaxially with the antenna element. The positional relationships between the inner and outer cylinders of each one of the first and second double sleeves relative to the antenna element are respectively specified.

Abstract: A vehicle antenna for AM/FM and MT waves including a first antenna element for MT waves vertically mounted on the vehicle roof and a second antenna element for AM/FM waves rotatably coupled to the top end of the first antenna element so that the second antenna element can be set at a desired angle relative to the roof of the vehicle. A trap element for blocking MT waves is installed near the lower end of the second antenna element.

Abstract: Rod-shaped multi-band antennas require at least one parallel resonance circuit for separating the individual frequency bands, which consists of a coil and a discrete capacitor. Multi-band antennas of this type for a maximum of three frequency bands are as a rule only suitable for a frequency range from 3 to 30 MHz. In a multi-band antenna (10) suitable for four frequency bands, a first coil (15) is located between a first and a second straight wire piece (14, 16), and a second coil (17) between the second, straight wire section (16) and a third, straight wire piece (18). The first coil constitutes a parallel resonance circuit or a trap circuit, and the second coil a phase shift coil. The multi-band antenna is particularly suited as a vehicle aerial to which a car radio for the AM and FM ranges as well as a mobile telephone for two different nets is connected. The drawing illustrates a rod-like multi-band antenna in accordance with the invention.

Abstract: An automobile mast antenna used in a state shorter than its resonant state including an FM compensating circuit made only of passive elements and compensating for FM signals and an AM compensating circuit made of active elements that convert high impedance into low impedance and compensating for AM signals. The FM compensating circuit is formed with a primary resonance circuit and a secondary resonance circuit, in which the primary resonance circuit resonates in FM band via impedance of an antenna mast and loading coil which is attached to the antenna mast, and the secondary resonance circuit resonates in FM band via a coil and capacitor. The primary and secondary resonance circuits are coupled by electrostatic capacitance of attachment section of the antenna mast so as to form a double-tuned circuit.

Abstract: A three-wave shared antenna used in an automobile comprises an MT wave element 10A wherein first and second phasing coils 11 and 12 are formed in an intermediate position of a conductive mast thereby forming the MT wave element 10A is formed in a three-step collinear manner to be able to transmit/receive an MT wave, a trap element 10B for interrupting the MT wave formed on top portion of the MT wave element 10A, and an auxiliary element 10C for AM and FM waves, which comprises another conductive mast connected to said conductive mast through the trap element 10B to be able to receive AM wave, which is a broadcast wave of an amplitude modulation system and FM wave, which is a broadcast wave of a frequency modulation system, in cooperation with said MT wave element.

Abstract: Wideband antenna systems may provide continuous coverage over the VLF, HF, VHF, and UHF frequency ranges. Matching transformers, insertion resistors and damping elements are integral parts of these antenna systems.

Abstract: A receiving antenna for a motor vehicle comprising a mounting (2) traversed by a bore (6) wherein there is fitted at one end an antenna element (1), and at its other end a conductor element (19, 20, 21, 22) intended to be electrically connected to the core of a coaxial cable (T), the antenna element (1) and the first conductor element (19, 20, 21, 22) Being electrically connected by electronic components (23) disposed inside the bore (6).

Abstract: An antenna element including a loading coil is telescopically extendable and retractable from within a housing tube. A characteristic impedance of a transmission line from a lower end part of the antenna element to a cable is equal to one of a cable. A part of the loading coil is reinforced. A branching filter, which is operatively connected between the antenna and a communication device using a different frequency band, suppresses a mutual interference between signals for the communication device. An antenna circuit, which is operatively connected between the antenna or a branching filter and the communication device, converts an impedance of a lower part in a frequency band, and reduces a loss due to a capacitive antenna impedance.

Abstract: To provide a single antenna suitable both for VHF as well as UHF television (TV) reception, without changing the length of the antenna, a core support rod (11) of, for example, flexible plastic material is resiliently coupled at one end to a connection terminal (29). Wound on the rod are two connected windings (12, 13), one of them being spiralled with wide spiral turns about the core support rod (11) throughout the major length of the antenna, the other winding (13) being wound closely or tightly thereabout. The two windings are capacitatively coupled by a turn or loop (17) of a third winding (18), pushed between the two last turns (15, 16) of the third winding (13) and electrically connected to the connection terminal (29). The distance (1.sub.1) between the third winding (18) and the connection terminal (29) is .lambda..sub.U /4, the distance between the end of the first winding (12) and the terminal is .lambda..sub.U /4, and which .lambda..sub.U and .lambda..sub.

Abstract: A multiband antenna system for use in a motor vehicle comprising an antenna unit responsible for first and second frequency bands. The antenna unit is electrically coupled to a first conduit tube which is in turn coupled coaxially to a second conduit tube with a capacitor being interposed therebetween. The capacitor is arranged so as to act as a short with respect to the first frequency signal and act as an open for the second frequency signal. The first conduit tube is connected to a first feeding terminal for deriving the second frequency signal and the second conduit tube is coupled to a second feeding terminal to derive the first frequency signal. This antenna system is constructed by using only one antenna unit having a predetermined length, thereby allowing simplification of the arrangement of the antenna system for easy manufacturing.