Abstract: A glass antenna for an automobile which can improve sensitivity in an FM broadcast band and a frequency band region higher than the FM broadcast band, wherein a defogger 3 and an antenna conductor 4 are provided in a rear window glass sheet 1; a vertical portion of the antenna conductor 4 crosses or overlaps a plurality of heater strips 2, and the antenna conductor 4 and the heater strips 2 are laid one upon another by interposing an insulation layer 15 in the crossing or overlapping portion.

Abstract: A heated antenna system includes an antenna having a reflecting surface and a heater associated with the reflecting surface. A heater controller includes a temperature sensor and/or a moisture sensor. The heater controller applies a voltage to the heater dependent upon an output of the temperature sensor and/or moisture sensor. A monitoring unit overrides the heater controller upon an occurrence of at least one predetermined condition.

Abstract: A window with an aerial for motor vehicles is provided with an electrically conductive layer (5) which fulfils the function of an aerial conductor. In order to prevent capacitive coupling of the layer to the bodywork of the vehicle, the layer (5) ends at a distance of a few centimetres from the edge of the window. The layer (5) is coupled capacitively to the aerial connection cable leading to the receiver set by means of a coupling electrode (9). The coupling electrode comprises thin wires (10) which are connected together by electroplating and are arranged at a large distance from one another which is large compared with their diameter.

Abstract: A satellite antenna deicing device for preventing accumulation of ice and snow upon the reception side of the satellite dish. The satellite antenna deicing device includes a mounting bracket member adapted to be securely fastened to an elongate satellite antenna support member; and also includes an arm member having a first end securely attached to the mounting bracket member and having a second end; and further includes a heating assembly for heating the satellite antenna for the deicing thereof.

Abstract: An antenna system for a vehicle radio integrated with the defogger heating elements in a window that provides enhanced impedance matching without requiring lumped matching components. The antenna system includes a vehicle window, a conductive grid embedded in the vehicle window and having a plurality of horizontal and generally parallel conductive elements, and first and second bus bars connecting the grid at opposite ends. The antenna system has first and second vertical conductive elements embedded in the vehicle window and arranged substantially orthogonal to the horizontal conductive elements. Tuning elements are coupled to each of the first and second vertical conductive elements and are substantially orthogonal thereto. The tuning elements have a length selected so as to substantially match characteristic impedance of an RF signal path. The horizontal heating elements are engaged for heating the vehicle window during a heating operation, and also serves to receive radio signals for the radio.

Abstract: An antenna, particularly for use in VHF radio reception in a vehicle, is disclosed. The antenna is formed from an array of conductors which may constitute a window heating arrangement. The array has a receiving zone which is isolated from its surroundings by resonant isolating zones. These may be formed by interconnecting adjacent-heating elements which may be at a distance of 0.25&lgr; of the wavelength (or multiple thereof) of the signal to be received from a real or virtual low-impedance connection to the vehicle structure.

Abstract: A first resonance is generated by the inductance of a first coil connected between a first antenna conductor in a window glass sheet and a receiver and the impedance of the antenna conductor, and a second resonance is generated by the inductance of a second coil connected between a second antenna conductor 3b and an automobile body as the earth. The antenna conductor and the antenna conductor are in a capacitive coupling relation, whereby signals in different broadcast band: a low frequency band and a high frequency band, are well received.

Abstract: A vehicle window/antenna system with enhanced heating and AM/FM reception. The system includes a window and a heating/antenna grid supported thereon. The grid is separated into upper and lower portions, and functions as an FM antenna. A flat AM antenna is supported on the window between the upper and lower grid portions. The positioning of the AM antenna within the heating grid enables ice and snow to be cleared from the AM antenna. Antenna leads extend from both the upper and lower grid portions as well as the AM antenna. The two FM leads are connected to a Balun transformer to balance the FM signals.

Abstract: An antenna installation for radio and television reception in motor vehicles in the meter and decimeter frequency wave ranges with a first antenna and-at least one additional antenna on the vehicle. The receiving signal available at each connection point of the antennas are combined in a collecting network. The signal then flows out of the collecting network to a reception point to form an overall receiving signal. The line and collecting network is designed to select the highest possible reception quality for a motor vehicle moving through a reception field based upon a statistical average.

Abstract: A dual coupled vehicle glass mount antenna system and method. The inventive system is adapted for operation through any suitable partition, such as an automobile windshield, and comprises an antenna mounted on a first side of the partition for receiving a signal and a first circuit connected to the antenna. The antenna and the first circuit are mounted on a first side of the partition. In accordance with the present teachings, an arrangement is provided for supplying power to the first circuit. The output of the first circuit is coupled through the partition to a second circuit mounted on a second side thereof by a first coupling arrangement. In the illustrative embodiment, the antenna is a radio frequency antenna, the partition is a vehicle windshield, the first circuit is an amplifier, and the arrangement for supplying power is a second coupling arrangement.

Abstract: A glass antenna device for a vehicle includes an FM reception antenna and an AM reception antenna both provided on a window glass of the vehicle, an AM-antenna-side impedance converter and a receiver-side impedance converter disposed at a different position from the window glass, a first coaxial cable interconnecting the two impedance converters, a receiver, and a second coaxial cable interconnecting the receiver-side impedance converter and the receiver. The distributed capacitance of the second coaxial cable is not in excess of 10 pF, so that the vehicle glass antenna device can reduce transmission loss at transmission lines, thus ensuring reception of AM signals at high sensitivity with little attenuation.

Abstract: A glass window antenna system for motor vehicles, in which a receiving sensitivity in an AM band is increased, is provided. One AM/FM antenna pattern is provided on a rear window, which has a pattern mainly receiving a FM band while maintaining an AM receiving characteristic, and an AM antenna pattern is provided which has an antenna pattern for obtaining AM receiving characteristic. An AM voltage received by the AM/FM antenna pattern and an AM voltage received by the AM antenna patterns are synthesized by superimposing the AM received voltage of the AM antenna patterns to the AM received voltage of the AM/FM antenna pattern through a low-pass filter.

Abstract: A windowpane antenna apparatus for vehicles according to the present invention includes a defogger mounted on a window of a vehicle, for defogging the window, means for causing the defogger to serve as a slot antenna, and a driven antenna arranged close and opposite to the defogger with a given gap therebetween in such a manner that one side of the driven antenna is mutually coupled to one side of the defogger.

Abstract: A reception antenna, applicable to the field of television signal transmission, for picking up signals originating from a stationary satellite which has a paraboloid reflector capable of reflecting signals received and concentrating them in a focal point where a source is arranged for guiding the signals towards a frequency converter. The source and the reflector are located inside a polyhedral housing permeable to electromagnetic waves and its lower surface is designed to be placed horizontally when the receiving antenna is being used, the relative positioning of the source and the reflector with respect to the housing lower surface has a predetermined on-site adjustment originally built in. The relative positioning takes into account the elevation angle corresponding to the position of the targeted satellite.

Abstract: A window glass antenna apparatus for vehicles comprising a vertical center wire provided in the middle and horizontal direction of a defogger for defogging a window glass of a vehicle, and a pair of short stub conductors provided at positions a ¼ wavelength of a wave in the horizontal direction away from the vertical center wire, and grounded through their respective grounding capacitors at high frequencies.

Abstract: A vehicle windowpane antenna apparatus comprises a defogger for defogging a vehicle window, which is constituted of strip conductor at least including a plurality of horizontal wires and a pair of bus bars, the bus bars being arranged on a window glass surface and each opposed to a metal section of a window frame with a bus-bar gap therebetween, a unit for separating the power source line and the defogger from each other in a high-frequency manner, vertical wires crossing the horizontal wires to form the defogger in a mesh pattern having meshes, a length of a longer side of each of the meshes being smaller than a wavelength of received wave, and a driven antenna having a height and provided close and opposite to the defogger with a clearance therebetween in such a manner that one side of the driven antenna is mutually coupled to one side of the defogger, the bus-bar gap being set to 50 mm to 70 mm, the clearance being set to 5 mm to 15 mm, the height of the driven antenna being set to 100 mm to 250 mm, the nu

Abstract: A glass antenna device capable of receiving well both AM and FM broadcast signals wherein a series resonance is generated by a coil 31 disposed between a defogger 90 and a receiver 7, a parallel resonance is generated by a coil 32 disposed between the defogger 90 and the automobile body as the earth and a high frequency choking coil 52 for blocking FM signals is connected between an antenna conductor 3 and the defogger 90 to prevent the FM signals exited in the antenna conductor 3 from leaking to the automobile body as the earth.

Abstract: A reflector assembly in a satellite system includes a reflector having a reflecting surface and a back surface. The back surface is opposite the reflecting surface and has a plurality of ribs extending transversely therefrom. The reflector assembly further includes a layer of air-entrapped foam insulation having an inside surface. The inside surface has a plurality of grooves configured to receive the plurality of ribs therein. The reflector assembly further includes a heater assembly attached to the inside surface of the layer of air-entrapped foam insulation. The heater assembly includes a plurality of heater pads, a plurality of jumper wires electrically interconnecting the heater pads in series, and two end wires. Each end wire is connected to a respective end one of the heater pads. Each of the plurality of heater pads is disposed between a corresponding adjacent pair of the grooves.

Abstract: A dish antenna heating assembly includes a dish antenna having a convex rear surface. a heating element associated with at least a portion of the convex rear surface a fabric cover overlying at least that portion of the convex rear surface with which the heating element is associated, and spacer elements disposed between the convex rear surface of the dish antenna and the fabric cover.

Abstract: An antenna disposed in a windowpane of a motor vehicle having an electrically conductive motor vehicle body having a direct current heating source. Disposed on the windowpane of the car is at least one heating field having at least one bus bar disposed on one side of the heating field. Connected to the bus bar at a connection point is a feeding network for feeding heating current into the bus bar. The feeding network is installed adjacent to the windowpane and comprises at least one magnetic core. Mounted on the at least one magnetic core is a primary winding which has a sufficient number of turns to transfer the high frequency, high impedance connection of the heating field. In addition, there is also a field compensation winding mounted on the at least one magnetic core, and is connected to a compensating current source so that this connection has no substantial effect in reducing inductive high resistence of this feed network and thus the high frequency reception of the antenna.

Abstract: A dielectric lens antenna having a lens comprising a dielectric material and a heating body disposed on a surface of the lens. The dielectric lens antenna has a snow-melting function, which prevents degradation in lens-efficiency.

Abstract: An antenna reflector assembly includes a reflector having a reflecting surface and an electrical heater for heating the reflecting surface. An ambient condition sensor senses an ambient temperature and/or an ambient moisture associated with an ambient environment and applies electrical power to the heater dependent upon the ambient temperature and/or the ambient moisture. A test device is connected to a source of electrical power. The test device includes a circuit breaker for cutting off an input current to the test device when the input current exceeds a predetermined threshold current. A ground fault circuit interrupter detects a ground fault condition and cuts off an electrical current associated with the ground fault condition. A current indicator senses a current through the heater and provides an indication thereof. At least one voltage indicator senses a voltage and provides an indication thereof.

Abstract: A vehicle backlite antenna system that includes separate FM antenna/defogger elements and AM antenna elements. The antenna system includes various FM impedance matching elements that provide FM impedance matching between the defogger elements or the antenna elements and an RF amplifier. These impedance matching elements include a shorting bar connecting a plurality of the AM antenna elements that is positioned between end bars of an AM antenna grid. The shorting bar can be a certain distance from the AM feedpoint to provide impedance matching for the low end of the FM frequency band. Additionally, a floating impedance matching element is connected to the FM antenna/defogger elements between the defogger elements and the AM antenna grid. The floating element can have a certain length to provide impedance matching for the upper end of the FM band.

Abstract: A backlite antenna system for a vehicle that includes a separated AM/FM antenna grid and a defogger grid. The backlite antenna system includes a defogger grid grounding system having an RF grounding strip that is capacitively coupled to the vehicle body through a urethane seal that seals the window to the vehicle body. The grounding strip and an end bar of the defogger grid create an FM slot gap therebetween and provide grounding at AM frequencies. An AM grounding line is connected to the grounding strip and to an element of the defogger grid. The grounding line has a length one-quarter of the wavelength of the FM transmission band to provide a high impedance path for FM frequencies, but a low impedance path for AM and DC frequencies. The grounding strip provides a high impedance path at DC, but a low impedance path at AM and FM frequencies.

Abstract: The invention is directed to a method of using a line voltage to heat an antenna reflector. The method includes the steps of providing an electrical heater for the antenna reflector, measuring a magnitude of the line voltage, ascertaining an ambient temperature, establishing a duty cycle for the heater dependent upon each of the measuring step and the ascertaining step, and cyclically connecting the line voltage to the heater and disconnecting the line voltage from the heater in accordance with the duty cycle. The duty cycle is defined as a percentage of total heating time in which the line voltage is electrically connected to the heater. The total heating time is a total time in which the ambient temperature is below a threshold temperature.

Abstract: An antenna for transmitting and/or receiving in the heating field of a window pane on a motor vehicle. The heating field has an HF-connection designed to couple or decouple high-frequency signals, and heating connections for feeding the heating power. An AC generator generates the heating wattage in the form of AC current, through a transformer. The heating power is supplied to the primary winding of the transformer and picked up on the secondary winding of the transformer and supplied to the heating field via heating connections. The primary winding and the secondary winding of the transformer are insulated to reduce the transmission of high frequency currents so that the heating field antenna does not have low resistance even at the lowest frequencies.

Abstract: A glass antenna device for a vehicle includes an FM antenna (as a receiving antenna for short-waves) and a defogger provided on a rear window glass of the vehicle, and an AM antenna (as a receiving antenna for medium-waves) provided on a side window glass fixed at a different position from the rear window glass of the vehicle. Since the AM antenna is spaced relatively far distant from electric equipments such as a rear wiper, stop lamps and indicators disposed at a rear portion of the vehicle, noises generated from the electric equipments are unlikely to be mixed in a transmission line of the antenna device.

Abstract: An antenna reflector assembly includes a reflector having a reflecting surface and an electrical heater having a first terminal and a second terminal. The electrical heater is configured for heating the reflecting surface. A remote monitor and test device is disposed at a location remote from the reflector. The remote monitor and test device is configured for being connected to a source of electrical power. The remote monitor and test device includes a line voltage node electrically connected to the first terminal of the heater, and one of a neutral node and a ground node electrically connected to the second terminal of the heater. A ground fault circuit interrupter is configured for detecting a ground fault condition and cutting off an electrical current associated with the ground fault condition. A current sensor is configured for detecting an electrical current exceeding a predetermined current level and transmitting a signal indicative thereof.

Abstract: A heated antenna system includes an antenna having a reflecting surface and a heater associated with the reflecting surface. A base is connected with the antenna. A direct current voltage supply is connected with the heater. The direct current voltage supply is configured for providing direct current power to the heater. The direct current voltage supply is coupled with the base and has a weight sufficient to ballast the base, thereby ballasting the antenna.

Abstract: A heated antenna system includes an antenna having a reflecting surface and a heater associated with the reflecting surface. The heater has a current and at least one voltage. An electrical control system is electrically coupled to the heater of the antenna. The electrical control system is configured for monitoring at least one of the current and the at least one voltage of the heater and issuing a status signal indicative of a status of the heater. A conductor is configured for simultaneously carrying electrical energy to the electrical control system and carrying data and electrical energy to the antenna. The electrical energy provides the current and the at least one voltage to thereby power the heater.

Abstract: An antenna reflector assembly includes a reflector, a heater for heating the reflector, and a support arm connected to the reflector. The support arm has a range of directional orientations. A sensor housing is connected to the support arm. The sensor housing includes a tube having a substantially vertical orientation and a mounting device configured for at least indirectly carrying the tube. The mounting device is configured for being connected to the support arm such that the tube can be maintained in the substantially vertical orientation throughout the range of directional orientations of the support arm. At least one sensor is disposed within the tube.

Abstract: A window glass for an automobile and the window structure capable of clearly indicating visually warning by a high mounted stop lamp, etc., while having a heat-shielding function and a privacy protecting function are provided. A heat-shielding film is formed on the concave side (inside the automobile) of the window glass for an automobile, the film is partially removed or modified, and the visible light transmission of the removed or modified portion is increased to a predetermined value than the visible light transmission of other film-formed portion.

Abstract: A first resonance is generated by the inductance of a first coil connected between a first antenna conductor in a window glass sheet and a receiver and the impedance of the antenna conductor, and a second resonance is generated by the inductance of a second coil connected between a second antenna conductor and an automobile body as the earth. The antenna conductor and the antenna conductor are in a capacitive coupling relation, whereby signals in different broadcast band: a low frequency band and a high frequency band, are well received.

Abstract: A glass antenna device for an automobile including a rear window glass sheet; an electric heating type defogger formed on the glass sheet, which is provided with heater strips and positive and negative bus bars for feeding a current to the heater strips; and a noise filter including at least a coil, which is connected between the positive bus bar and a positive terminal of a d.c. power source for the defogger. The negative bus bar is grounded to the automobile body, and antenna conductors are provided in a region in the rear window glass sheet other than the region where the defogger is formed. An antenna conductor element of the antenna conductors extends substantially parallel to the heater strips of the defogger, is more than half in length than a width of the rear window glass sheet, and is located in the range of 15 mm-50 mm apart from an end heating strip of the heating strips of the defogger nearest to the antenna conductor element. The coil has an inductance value in the range of 0.5-10 .mu.H.

Abstract: A system for preventing the interruption of satellite communications between an earth antenna and a satellite during inclement weather. The system is comprised of a cover that is adapted to be positioned on the opening of the satellite cover so as to reduce the likelihood of liquid water accumulating on the front reflecting surface of the antenna. The cover and the front reflecting surface further define a space and an air circulation system circulates air in the space. The circulating air increases the air pressure in the space relative to the surrounding atmosphere and pressurized air then travels through the cover and blows water accumulating on the outer surface of the cover off of the outer surface to further reduce the likelihood that accumulations of water on the outer surface of the cover will result in interruptions to satellite communications with the earth based satellite antenna.

Abstract: A broadband FM antenna is suitable for mounting on an inner surface of a rear window glass of a motor vehicle above an electric rear window defogger grid also mounted on the glass and made of the same frit material. The antenna has an extended range of reception across a commercial FM band without the need for an antenna boost amplifier and is capable of use in multiple countries having different commercial FM bands. The antenna comprises a plurality of horizontal frit lines extending outward from a series of points near the horizontal center of the rear window as described and claimed herein. Some of these horizontal elements are joined by outer connecting frit lines at their outer ends and all are connected at their inner ends by a plurality of inner connecting elements connecting all of the points together. The frit lines essentially form a pair of horizontal antenna elements, each tuned to one quarter of a different commercial FM band wavelength so that the antenna spans the desired band or bands.

Abstract: A window glass antenna system comprises a grounding electrode disposed on a surface of a side edge portion of a window glass and connected with a braided outer conductor of a coaxial cable, a feeding electrode disposed on the surface of the window glass side edge portion proximately to the grounding electrode and connected with a center conductor of the coaxial cable, a signal retrieval pattern extending downwardly from the feeding electrode along the window glass side edge portion and bent to provide a horizontal portion, and a radiation pattern connected substantially perpendicularly to an end portion of the horizontal portion of the signal retrieval pattern. As a result, the window glass antenna system can be easily disposed at the window glass side edge portion while exhibiting excellent performance.

Abstract: A rear window glass antenna on a rear window glass panel of an automobile includes a plurality of heating electric wires disposed horizontally on the rear window glass panel, a feeder terminal disposed on the rear window glass panel near an edge thereof, and a plurality of antenna wires disposed on the rear window glass panel. The antenna include a first section extending from the feeder terminal along an edge of the rear window glass panel, a second section folded from an end of the first section toward a vertical central line of the rear window glass panel, and a third section extending as a main antenna section from an end of the second section. The second section includes a horizontally folded portion which comprises a plurality of thin wires lying parallel to each other.

Abstract: A heater assembly for use with a feedhorn in an antenna system includes at least two heater bodies, with each heater body being configured to be placed directly against the feedhorn at an exterior periphery of the feedhorn. Each heater body has at least one heater disposed therein, with all of the heaters being electrically connected together. A plurality of springs are connected at opposite ends thereof with adjacent heater bodies. The plurality of springs hold the heater bodies against the feedhorn.

Abstract: A glass antenna has a rectangular loop antenna element which is extended on the upper region of a windshield glass where no heating wires of a defogger are arranged, and is capacitively coupled to the uppermost heating wire of the defogger at a predetermined capacitance, and a T-shaped second antenna element which is arranged on a region where the defogger is arranged, and is capacitively coupled to the uppermost heating wire of the defogger.

Abstract: The present invention provides for the use of electroconductive ceramic thermoplastic, thermoset and ultraviolet radiation curable paints as antenna elements and/or connector elements in a transparent antenna system. Antenna elements are formed on a major surface of a rigid transparent ply, preferably glass, and connected to a connector that permits transfer of signals generated by the antenna element to an electromagnetic energy transmitting and/or receiving device. The connector may be in direct electrical contact with or capacitively coupled to the antenna element. If desired, additional rigid transparent plies may be secured to the first ply to form a laminate, wherein the antenna element or the antenna element and the connector are laminated between the rigid plies.

Abstract: An electric contact for connecting a conductive system present on an insulating substrate, in particular for automobile windshields, in which the conductive system is connected via a conductive path with an electric mating contact. A moisture-resistant electric contact which is easy to manufacture and can be universally used consists of a conductive path which is disposed directly on a support substrate as a path-shaped conductive layer on which an electric connecting line of the conductive system is located.

Abstract: A reflector assembly in a satellite system includes a reflector having a reflecting surface and a back surface. The back surface is opposite the reflecting surface and has a plurality of ribs extending transversely therefrom. The reflector assembly further includes a layer of air-entrapped foam insulation having an inside surface. The inside surface has a plurality of grooves configured to receive the plurality of ribs therein. The reflector assembly further includes a heater assembly attached to the inside surface of the layer of air-entrapped foam insulation. The heater assembly includes a plurality of heater pads, a plurality of jumper wires electrically interconnecting the heater pads in series, and two end wires. Each end wire is connected to a respective end one of the heater pads. Each of the plurality of heater pads is disposed between a corresponding adjacent pair of the grooves.

Abstract: The present invention provides a connector for a glass antenna system having a coil, a first mounting member electrically secured to a first end of the coil, and a second mounting member electrically secured to a second end of the coil. The second mounting member includes an arrangement to permit electrical connection of the connector to a ground. The connector is provided with an arrangement such that the first and second mounting members may be secured to a glass substrate. In one particular embodiment of the invention, the coil is formed from copper wire and includes a ferrite core which extends through the coil. In addition, the first mounting member includes an arrangement to permit electrical connection of the connector to a radio signal receiving device.

Abstract: A glass antenna system with good rear visibility. A glass antenna has a first antenna conductor element extending on a blank region where no defogger hot wires extend, a second antenna conductor element which is capacitively coupled to the first antenna conductor element in a defogger region, a third antenna conductor element which extends at a position substantially symmetrical to the first antenna conductor element about the central line of the defogger, and a fourth antenna conductor element which extends at a position substantially symmetrical to the second antenna conductor element about the central line, and is capacitively coupled to the third antenna conductor element.

Abstract: A parabolic reflective antenna having a front concave surface and a rear convex surface. The reflective antenna including a heating assembly for preventing and removing ice and snow during cold weather. The heating assembly includes first and second woven supporting structures. A heating element is supported between the first and second supporting structures, the first and second woven supporting structures being interposed between the front and rear surfaces of the antenna. Heat generated from the heating element emanates to the front concave surface of the reflective antenna.

Abstract: A window glass antenna apparatus comprises two antennas exclusively for receiving respective AM and FM radio signals, a first impedance transformer disposed between the antennas and a signal cable for transforming impedance in an AM frequency band from high impedance to low impedance, and a second impedance transformer provided at an output side of the signal cable for transforming impedance in the AM frequency band from low impedance to high impedance. The first impedance transformer includes a primary winding which has one end connected to the AM radio signal receiving antenna, and a tap provided at a primary side thereof and connected to FM radio signal receiving antenna. The second impedance transformer includes a secondary winding which has one end for serving as an AM radio signal output terminal, and a tap provided at a secondary side thereof for serving as an FM radio signal output terminal.

Abstract: A satellite antenna cover device for covering a satellite antenna is provided. The satellite antenna has a satellite dish, an arm extending away from the satellite dish, and a horn mounted to the arm. The device comprises a flexible dish cover with the dish cover covering the satellite dish of the satellite antenna and substantially conforming to the shape of the satellite dish. A flexible arm cover covering the arm of the satellite antenna and substantially conforming to the shape of the arm with the arm cover extending substantially from the satellite dish to the horn. A flexible horn cover substantially conforming to the shape of the horn of the satellite antenna with the horn cover covering the horn of the satellite antenna.

Abstract: A window glass antenna system is attached to a surface of a pane of vehicular window glass and comprises an antenna switching circuit attached directly onto the window glass pane in close proximity to antennas of the system for switching over the antennas. The antenna switching circuit has a plurality of mounting terminals and a plurality of input signal lines connected to the mounting terminals which in turn are fixedly secured to power terminals fixed to the window glass pane for powering the antennas. The thus-arranged antenna system has improved directional repeatability and reception sensitivity in that the antenna switching circuit is positioned closely to the antennas and connected to the antenna powering terminals without requiring the use of any elements that may form part of the antennas during operation thereof.

Abstract: There is provided a glass antenna system which is attached to a vehicle rear window glass for receiving FM and AM radio broadcast waves. The glass antenna system comprises a defogging heater element disposed on the rear window glass in a way as to leave a space therearound. The defogging heater element includes a plurality of heating strips and a pair of bus bars.