Abstract: An antenna for a windowpane or windshield, comprising a thin, electrically conductive layer flatly applied to an area of the windowpane. The layer is transparent to light and capable of reducing the transmission of heat through the windowpane, and creates a low-conductive area having non-negligible surface resistivity on the windowpane. Also provided is a substantially flat electrode made of highly conductive material, which is high-frequency connected with a reduced high frequency loss connected at at least one edge of said low-conductive layer, and also capacitively connected at high frequencies to an antenna connection point. The electrode is sufficiently long so as to minimize the loss created by the edge of the low-conductive layer. The low-conductive layer can also be sandwiched between glass panels such as in automotive safety glass and an additional electrode can be capacitively coupled to the main electrode.

Abstract: The invention is directed to a reflector assembly in a satellite system including a reflector and a layer of insulation. The reflector includes a reflecting surface and a heater assembly embedded therein. The heater assembly is disposed on a side of the reflector opposite the reflecting surface. The layer of insulation covers the heater assembly and is disposed on a side of the heater assembly opposite the reflecting surface.

Abstract: A device is indicated for covering the aperture of an antenna having a parabolic reflector and an exciter. The cover is made of a rigid material. The cover includes a shield ring connected to the reflector and a plastic cover shaped like a flat or obtuse cone having a conical portion which closes the open end of the reflector. The wall of the conical portion of the cover forms an angle between 4.degree. and 6.degree. with a plane that is at a right angle to the axis of the shield ring.

Abstract: A glass antenna device for a vehicle includes a glass sheet to be fitted to a window opening of a vehicle, which has a first antenna conductor for a low receiving frequency band and a second antenna conductor for a high receiving frequency band arranged thereon; a first coil connected between the first antenna conductor and the second antenna conductor, the first coil having an inductance value which exhibits low impedance in at least the low receiving frequency band; wherein the first coil cooperates with a first other element to generate first resonance so that the first resonance has a resonant frequency existing in a lower frequency band region than the high receiving frequency band.

Abstract: An antenna installation adapted for long-/medium-/short wave and television frequency ranges for use in a motor vehicle windowpane having a conductive window frame. The installation includes an antenna conductor disposed on the windowpane, an antenna conductor connection point located near the window frame and within the zone of the windowpane adhesive, which acts as a dielectric, and an electrical unit mounted on the windowpane. A receiving and transmitting unit is provided and an HF-cable is connected to the output contacts of the electrical unit at one end and to the receiving and transmitting unit at the other end. A flat capacitive element having a conductive surface located within the zone of the HF-mass reference point and extending along the edge of the windowpane within the windowpane adhesive provide the connection between the electrical unit and the antenna conductors.

Abstract: A concealed antenna system (16) for a motor vehicle (10) including a first antenna element (18) mounted on a first window (20), or panel, of the vehicle and at least a second antenna element (30) mounted on a second window (19), or panel, of the vehicle. The first antenna element (18) includes a conductive line (22) and a conductive loop (26) connected to one another. The first and second antenna elements are connected to one another in series by a wire (32) between the loop (26) on the first antenna element (18) and a conductive portion of the second antenna element (30).

Abstract: A glass antenna device for an automobile which has an electric heating type defogger, antenna conductors disposed near the defogger in a capacitive coupling relation, which are formed on a glass sheet to be fitted to a rear window opening of an automobile, and a reactance circuit connected between bus bars for the defogger and a d.c. power source for the defogger, wherein there is an anti-resonance point caused by impedance composed mainly of capacitance which is produced in correlation among the antenna conductors, the defogger and the body of automobile and the impedance of the reactance circuit, the anti-resonance point being out a predetermined receiving frequency band region or a predetermined broadcast frequency band region, and there is a resonance point between the frequency of 1.5 times of f.sub.H and f.sub.L, where f.sub.H is the highest frequency in the predetermined receiving frequency band region or the predetermined broadcast frequency band region and f.sub.

Abstract: An automobile windshield covered with a transparent electrically conducting layer, on which some hollowed spaces are provided in the form of slots. The length of these slots is a function of the wavelength of the microwave radiation. The microwave radiation, as used for transmission of information in portable telephone sets or remote surveillance systems of toll roads, for example, is absorbed by the conducting layer to again be retransmitted by the slots which act as antennas. In this manner, vehicle windshields which are provided with an electrically conducting layer which reflects the infrared can allow microwave radiation to pass through.

Abstract: A method and system for controlling a heating device mounted on e.g. a satellite receiver antenna is disclosed. The method includes the steps of determining whether the signal strength is degrading, determining whether a temperature is below a threshold temperature, and operating a heating device on the antenna only if the signal is degrading and the temperature is below the threshold. The system includes a temperature sensor that samples a relevant temperature, a device that measures a signal strength of a signal received by the antenna, logic in communication with the temperature sensor and the measuring device for determining whether both the signal strength is degrading and the sample temperature is below a threshold temperature, and a control or switch device for operating a corrective device, such as a heater.

Abstract: The invention is directed to a reflector assembly in a satellite system including 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 further includes a heater assembly embedded therein. The reflector assembly further includes a layer of closed cell plastic foam insulation which covers the heater assembly within the reflector. An inside surface of the insulation is disposed adjacent to the back surface of the reflector and includes a plurality of grooves. The plurality of grooves are configured to receive the plurality of ribs therein. The layer of insulation also includes a coating of ultraviolet radiation protectant disposed over an outside surface of the insulation.

Abstract: The invention is directed to a heatable feedhorn assembly including a feedhorn having a wide end and a heater assembly wrapped around the wide end. The heater assembly includes an elongate element in the form of a cable tie and an electrically insulated heater wire wrapped around the elongate element.

Abstract: A bifilar coil construction is used for isolating radio signals picked up by a motor vehicle window heating element from the power supply circuit for the heating element. The coil construction has two separate windings (9,10) which are arranged bodily alongside each other. In one embodiment there is an inner cylindrical winding (9) within and in contact with an outer cylindrical winding (10), and a two part pot core (15,16) is clamped within and around the windings (9,10).

Abstract: A window glass antenna device disposed on an automobile window glass panel has a dedicated antenna disposed on the automobile window glass panel, a heater antenna comprising a defroster heater pattern disposed on the automobile window glass panel, and a feeder cable for transmitting received signals from the dedicated antenna and the heater antenna. An impedance transformer for effecting an impedance conversion between the dedicated antenna and the heater antenna, and the feeder cable has a primary winding having an end connected to the dedicated antenna, the primary winding having a tap connected to the heater antenna, and a secondary winding connected to the feeder cable.

Abstract: The pane antenna for a very high or ultra-high frequency range includes heating conductors arranged on a window pane between two transverse busbars; at least one wire-shaped conductor forming a first antenna conductor crossing at right angles to at least one heating conductor and coupled by galvanic connection with the heating conductors at a low impedance to create a capacitive antenna region adjoining their crossing points; an antenna terminal outside the heating field on the window pane; a second antenna conductor connecting the antenna terminal with the first antenna conductor and a power supply network for supplying direct current to the busbars without an additional network for increasing impedance connected between the busbars and the vehicle body. The two transverse busbars are arranged so that each heating conductor extends between and is connected with the busbars.

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, which covers the antenna and substantially prevent the accumulation of snow and precipitation on the antenna, and a heating system which provides heated air to a space between the cover and the antenna to inhibit snow from sticking to the cover and also to inhibit the formation of frozen moisture on the cover during freezing rain and freezing fog conditions. In one embodiment, the system has an electric heater and a blower system which draws air from the space between the cover and the antenna, heats this air and then recirculates the heated air back to the space.

Abstract: A wave reflecting dish is constructed to provide a one piece unit having a hollow, watertight region between a first external surface having a paraboloidal contour and a second external surface which includes a base. Heater elements are positioned in the hollow region on a surface opposite the first external surface. Insulating material cover the heater elements and the hollow region is filled with a foam material. Snow, ice, and water drainage from the first surface is provided through a hole which extends through the unit from the first surface to the second surface. Provisions for mounting wave emitting and receiving apparatus are provided within the first surface. Attachment pads for mounting the dish on an external structure are provided on the base.

Abstract: A backlite antenna system for an AM/FM vehicle stereo where the antenna system includes an antenna grid embedded in a rear window of the vehicle, that is electrically separate from a heater grid embedded in the rear window. The antenna grid includes a plurality of equally spaced, horizontal antenna elements that extend almost the entire width of the rear window of the vehicle. Two vertical end bus bars and two vertical center bars connect the antenna elements. An FM tuning stub is connected to the antenna elements for appropriate FM reception depending on the type of vehicle body. An antenna module housing a matching circuit, and possibly an amplifier circuit, is located in the header of the vehicle adjacent to the vehicle window.

Abstract: A radio antenna formed in a vehicle window is coupled with a radio apparatus using an RF transformer having a primary winding connected between the antenna/heating element and the vehicle body and a secondary winding connected between the vehicle body and the radio apparatus. Preferably, the transformer also has a third winding which connects to a second antenna/heating element terminal for completing the electrical supply current circuit through the heating element. The primary winding and third winding are wound with identical turns and connected so the electrical heating current flowing through each winding generates a flux equal in magnitude and opposite in direction to the other to cancel the flux resulting from the heating current and thus prevent saturation of the transformer. Shunting capacitors cause RF currents through the primary winding and third winding to be equal in magnitude and in phase.

Abstract: The present invention discloses a glass antenna and connection arrangement. The antenna includes a first glass sheet having a notch area cut out along a portion of an edge of the first sheet, a second glass sheet secured in overlaying relation to the first sheet, and at least one electroconductive antenna element supported on the second sheet between the first and second sheets. The antenna element includes a portion that extends into the notch area. A connector is positioned within the notch area and filler material fills the notch area to secure the connector within the notch area and seal the notch area. The connector includes a first section which overlays the portion of the electroconductive antenna element extending within the notch area, a second section with selected portions which extend along and are secured to an outer major surface of the first sheet, and a third section which interconnects the first and second sections.

Abstract: A cover for protecting a direct broadcast satellite antenna having a flange around the outside perimeter of the antenna. The cover is fabricated from a waterproof, flexible sheet material, such as marine grade vinyl. The cover is sized to have a margin extending approximately one-half of the width of the flange beyond the outside edge of the antenna. A "J clip" strip having one edge folded over in a "J" configuration and having a width approximately the same dimension as the flange of the antenna, is positioned along the outer face of the cover with the opposite edge of the strip aligned even with the edge of the cover. The strip is sewn or otherwise attached to the cover material to form the completed cover. A gap of approximately 6" can be provided along one portion of the perimeter of the cover to provide clearance for the supporting structure and ventilation to the inside of the antenna.

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, which covers the antenna and substantially prevents the accumulation of snow and precipitation on the antenna, and a heating system which provides heated air to a space between the cover and the antenna to inhibit snow from sticking to the cover and also to inhibit the formation of frozen moisture on the cover during freezing rain and freezing fog conditions. In one embodiment, the system has an electric, gas or oil heater and a blower system which draws air from the space between the cover and the antenna, heats this air and then recirculates the heated air back to the space. Further, the heating system is equipped with a temperature and moisture sensor unit and a controller.

Abstract: A diversity glass antenna for an automobile, wherein a dipole antenna is provided on a glass plate of a window of an automobile, a single pole antenna is provided at a part other than the glass plate and a stronger one of receiving signals of the dipole antenna and the single pole antenna is selected and employed, or, a diversity glass antenna for an automobile, wherein a single pole antenna is provided on a glass plate of a window of an automobile, a dipole antenna is provided at a part other than the glass plate and a stronger one of receiving signals of the dipole antenna and the single pole antenna is selected and employed.

Abstract: A method and system that provides power to an antenna clearing device through a coaxial cable used to transmit the satellite signals is disclosed. Receiver decoder box for receiving satellite signals via an LNB is connected to the LNB by the coaxial cable. The antenna clearing device is also connected to the coaxial cable. A power source within the box provides power to the LNB and the antenna clearing device via the coaxial cable.

Abstract: A window glass antenna for automobile telephone has a hot antenna wire mounted on a window glass panel substantially horizontally in electromagnetically coupled relation to either an upper or lower horizontal member of a metallic window frame, a ground antenna wire mounted on the window glass panel in a position displaced inwardly from the hot antenna wire toward the geometric center of the window glass panel, the ground antenna wire having an end disposed near an end or a center of the hot antenna wire.

Abstract: A glass antenna having a defogger and an antenna conductor each extending on a glass comprises a first antenna conductor element extending along the glass surface and a second antenna conductor element which extends upward and downward along the glass surface substantially at the center of the defogger in a vehicle width direction in the region to which the defogger extends and a portion of which is coupled to a heating wire of the defogger through a direct current, wherein the first antenna conductor element is disposed to the defogger so that the heating wire connected the second antenna conductor element is coupled to the first antenna conductor element through capacitive coupling with a capacitance of about 40 pF or less.

Abstract: A glass antenna device for an automobile which has an electric heating type defogger, antenna conductors disposed near the defogger in a capacitive coupling relation, which are formed on a glass sheet to be fitted to a rear window opening of an automobile, and a reactance circuit connected between bus bars for the defogger and a d.c. power source for the defogger, wherein there is an anti-resonance point caused by impedance composed mainly of capacitance which is produced in correlation among the antenna conductors, the defogger and the body of automobile and the impedance of the reactance circuit, the anti-resonance point being out a predetermined receiving frequency band region or a predetermined broadcast frequency band region, andthere is a resonance point between the frequency of 1.5 times of f.sub.H and f.sub.L, where f.sub.H is the highest frequency in the predetermined receiving frequency band region or the predetermined broadcast frequency band region and f.sub.

Abstract: A glass antenna device for an automobile which has an electric heating type defogger, antenna conductors disposed near the defogger in a capacitive coupling relation, which are formed on a glass sheet to be fitted to a rear window opening of an automobile, and a reactance circuit connected between bus bars for the defogger and a d.c. power source for the defogger, wherein there is an anti-resonance point caused by impedance composed mainly of capacitance which is produced in correlation among the antenna conductors, the defogger and the body of automobile and the impedance of the reactance circuit, the anti-resonance point being out a predetermined receiving frequency band region or a predetermined broadcast frequency band region, and there is a resonance point between the frequency of 1.5 times of f.sub.H and f.sub.L, where f.sub.H is the highest frequency in the predetermined receiving frequency band region or the predetermined broadcast frequency band region and f.sub.

Abstract: An FM signal antenna for window glass mounting in a motor vehicle includes an elongated conductor formed as a ladder to form a series of openings along its length. Preferably, the ladder is constructed of a pair of parallel conductors and crossmember conductor segments coupled across the parallel connector. The crossmember conductors are spaced from each other a distance substantially less than the wave length of the signals to be received. In addition, the antenna includes a raised feed point positioned along the length of the conductor. The conductor has a length substantially greater than the window area so that a fold is formed in the conductor, and an extended portion of the conductor overlapping from the fold is preferably aligned with the feed point. In addition, the antenna is mounted above a heater grid comprising a plurality of transverse conductors extending between common potential conductors at either end of the grid.

Abstract: A window glass antenna device defrosting heaters for use as part of a reception antenna on an automobile window glass panel. The defrosting heaters include at least first and second heaters each comprising a plurality of heater wires disposed on the window glass panel, a first bus bar interconnecting ends of the heater wires, and a second bus bar interconnecting opposite ends of the heater wires. A first choke coil is connected between the first bus bars of the first and second heaters and a battery, and disposed near the first bus bars, and a second choke coil is connected between the second bus bars of the first and second heaters and the battery, and disposed near the second bus bars.

Abstract: The radio antenna arrangement for establishing a radio link with terrestrial radio stations includes a group of antennas (10) mounted on an inclined window pane (1) of a particular electrically conductive motor vehicle body, each of the antennas (10) including an antenna element (3) mounted outside of an interior of the vehicle body (8) and on the window pane perpendicular to it; an antenna counterweight (4) mounted on the inclined window pane, the antennas (10) together forming a group antenna with a group antenna connection point (6); and a network (7) containing the group antenna connection point (6), the antennas being radiatively coupled to each other by high-frequency radiation and at least one antenna (10) having an antenna element connection point (2) connecting it with the network (7).

Abstract: A heated microwave antenna ideal for the direct broadcast satellite service, and heated conversion kits for retrofitting to conventional antennas. Antennas modified in accordance with the invention are highly weather resistant, as the dish is warmed to avoid snow and ice accumulation to prevent signal degradation. The heated microwave antenna mounts upon a mast that is bracketed to a satisfactory support. The dish focuses microwave signals upon a low noise broad band amplifier (LNB). The dish comprises multiple laminations from internal elements that are sandwiched together, and exhibits significant mechanical strength and substantial weather resistance. The preferred dish comprises a metallic reflector, a heated grid, an insulation layer, and a backing plate nested together to form a composite, laminated unit. The grid comprises a resistive heater element activated by a temperature-responsive thermostat. A concentric trim ring surrounding the dish periphery waterproofs the antenna.

Abstract: A backlite antenna system for an AM/FM vehicle stereo where the antenna system includes an antenna grid embedded in a rear window of the vehicle, that is electrically separate from a heater grid embedded in the rear window. The antenna grid includes a plurality of equally spaced, horizontal antenna elements that extend almost the entire width of the rear window of the vehicle. Two vertical end bus bars and two vertical center bars connect the antenna elements. An FM tuning stub is connected to the antenna elements for appropriate FM reception depending on the type of vehicle body. The antenna grid also includes an L-shaped element connected to one of the end bus bars and extending between the antenna grid and the heater grid, and a T-shaped element connected to one of the vertical center bars and also extending between the antenna grid and the heater grid. Also, two of the antenna elements are separated and connected by vertical connecting antenna elements.

Abstract: An automobile antenna including a defogging heater wire and a conductor combined into a simple structure for a good FM reception. FM choke coils, which prevents high-frequency signals from being transmitted from power supply circuit to the heater wire, is installed between the heater wire terminal and the power supply circuit for the heater wire, and the heater wire which resonates in the FM frequency band but not in the AM frequency band is inductively coupled to the conductor which is installed on the surface of the window glass and can resonate in the FM frequency band but not in the AM frequency band. The heater wire and conductor are installed in such a positional relationship as to create a double resonance.

Abstract: A window glass antenna for receiving AM and FM broadcast radiowaves in a diversity reception mode includes an inverted T-shaped antenna wire, a plurality of horizontal defrosting hot wires spaced from the inverted T-shaped antenna wire, an inductive coupling wire connecting the inverted T-shaped antenna wire and the horizontal defrosting hot wires to each other, power supply lines connected to the horizontal defrosting hot wires for energizing the horizontal defrosting hot wires, and first and second high-frequency blocking coils inserted in the power supply lines, the second high-frequency blocking coils being connected between the first high-frequency blocking coils and the horizontal defrosting hot wires. An AM broadcast signal can be received by the horizontal defrosting hot wires and portions of the power supply lines which are bounded by the first high-frequency blocking coils.

Abstract: A diversity glass antenna for an automobile, wherein a dipole antenna is provided on a glass plate of a window of an automobile, a single pole antenna is provided at a part other than the glass plate and a stronger one of receiving signals of the dipole antenna and the single pole antenna is selected and employed, or, a diversity glass antenna for an automobile, wherein a single pole antenna is provided on a glass plate of a window of an automobile, a dipole antenna is provided at a part other than the glass plate and a stronger one of receiving signals of the dipole antenna and the single pole antenna is selected and employed.

Abstract: A window glass antenna device on an automobile window glass panel of an automobile includes a defrosting heater disposed on the automobile window glass panel, and a radio signal receiving antenna disposed on the automobile window glass panel. A loop-shaped remote control signal receiving antenna is disposed on the automobile window glass panel and extends from a feeder terminal on the window glass panel along outer peripheral edges of the automobile window glass panel around the defrosting heater and the radio signal receiving antenna. Alternatively, a first remote control signal receiving antenna is disposed on the automobile window glass panel and extends clockwise from a feeder terminal on the automobile window glass panel along an outer peripheral edge thereof, and a second remote control signal receiving antenna is disposed on the automobile window glass panel and extends counterclockwise from the feeder terminal along another outer peripheral edge thereof.

Abstract: An automobile antenna including a defogging heater wire and a conductor combined into a simple structure to accomplish a good FM reception. An FM choke coil which insulates in view of high-frequency the heater wire from the power supply circuit is installed between the heater wire terminal and the power supply circuit for the heater wire, and the heater wire which resonates in FM frequency band but not in AM frequency band is capacitively coupled to a conductor which is installed on the surface of the window glass and resonates in the FM frequency band but not in the AM frequency band. The heater wire and conductor are installed in such a positional relationship that a double resonance is created.

Abstract: An anti-ice radome having a frequency selective surface and a plurality of resistive heating elements is disclosed. The frequency selective surface prevents the resistive heating elements from disturbing the electromagnetic waves generated by an antenna within the radome. Thus, ice formation on the radome can be prevented without sacrificing the transmission characteristics of the radome.

Abstract: An automotive antenna system for receiving FM broadcast band radio signals includes a conformal antenna and a glazing panel having an electrically conductive coating. A conductive trace integrated with a front windshield panel, for example, forms an active slot antenna which is connected by a coaxial cable to the automobile's FM radio receiver. A transparent conductive layer is applied over a substantial portion of the rear window opening which is typically dimensioned such that it would otherwise be resonant within the FM broadcast band and parasitically coupled to the active antenna, which would cause the active antenna to have an undesirable directional pattern. The transparent layer has a sufficiently high conductivity and is applied over a sufficiently large portion of the resonant window opening to substantially reduce or eliminate resonances within the FM broadcast band.

Abstract: A second antenna is provided to a vehicle rear window glass in order to prevent a fall or dip of the gain of the antenna system in a particular direction or directions, thereby improving the directivity characteristic and increasing the gain. The second antenna consists of a feed point and a pair of first and second elements connected to the feed point. The first element has, in an area of the space above a first antenna or in a space defined between the upper and lower ends of a first antenna, at least one horizontal conductive strip. In one embodiment, in which the feed point is arranged in a marginal area of the space under the defogging heater element, the first element further has a vertical conductive strip arranged in an area of the space between the heater element and a lateral edge of the window glass.

Abstract: An antenna is attached to a rear window glass of an automobile and arranged in a space between a defogging heater element and a lower edge of the window glass. According to an aspect of the present invention, the antenna comprises a plurality of horizontal conductive strips having the length of 0.02.lambda..multidot.f.sup.1/2 (1.+-.0.2), adjacent two of which are connected at opposite ends so as to constitute a rectangular loop. The number of the horizontal conductive strips is in the range of 2 to 4.

Abstract: An automobile antenna including a defogging heater wire and a conductor combined into a simple structure to accomplish a good FM reception. A capacitor which effects high-frequency grounding of the terminals of the defogging heater wire is installed between the terminals and a vehicle body. The heater wire which resonates in the FM frequency band but not in the AM frequency band is capacitively coupled to the conductor which resonates in the FM frequency band but not in the AM frequency band. The heater wire and the conductor are installed in such a positional relationship that a double resonance is created.

Abstract: An automobile antenna including a defogging heater wire and a conductor combined into a simple structure to accomplish a good FM reception. A capacitor which effects high-frequency grounding of the terminals of the defogging heater wire is installed between the heater wire terminals and a vehicle body, and the heater wire which resonates in the FM frequency band but not in the AM frequency band is inductively coupled to the conductor which is installed on the surface of the window glass and resonates in the FM frequency band but not in the AM frequency band. The heater wire and the conductor are installed in such a positional relationship that a double resonance is created.

Abstract: A appartus for deicing a reflector type microwave antenna. The appartus includes an infrared generator placed behind the antenna dish and a paraboloidal reflector. The infrared generator acts as a point source at the focal point of the paraboloidal reflector emitting radiant energy away from the antenna dish onto a paraboloidal reflector. The paraboloidal reflector reflects the radiant energy parallely to the principal axis of the reflector onto the rear surface of the antenna dish to uniformly heat the antenna dish.

Abstract: A known first antenna is arranged in a space of a rear window glass above a defogging heater element and constituted by horizontal and vertical conductive strips. In accordance with the present invention, a second antenna is provided which consists of a feed point and a pair of first and second elements connected to the feed point and arranged in a space of the window glass around the heater element. The first element has a vertical conductive strip arranged in an area of the space between the heater element and a lateral edge of the window glass.

Abstract: A glass antenna for an automobile uses a coil connected directly to a bus for defogging heaters as an FM subsidiary antenna and a T-shaped impedance matching circuit to provide a monotone change of impedance within the FM frequency band. A reverse T-shaped FM main antenna is employed in conjunction with the FM subsidiary antenna to provide a diversity system to enhance receiving sensitivity in entire directions. The T-shaped matching circuit comprises at least two varactor diodes each applied to a channel selection voltage to match the FM antenna impedance with that of the FM receiver including that of the transmission cable.

Abstract: A window glass antenna device is combined with a laminated window glass panel, such as a rear window glass panel of an automobile, which has a pair of inner and outer glass layers bonded to each other. The window glass antenna device has, as antenna elements, a plurality of defroster heater wires disposed between the glass layers. A pair of spaced first and second bus bars is disposed between the glass layers, the first bus bar electrically interconnecting first ends of the defroster heater wires and the second bus bar electrically interconnecting second ends of the defroster heater wires. A first electrode is disposed on an outer surface of the inner glass layer and joined to the second bus bar for supplying electric energy to heat the defroster heater wires, and a second electrode is disposed on the outer surface of the inner glass layer in confronting relationship to the first bus bar.

Abstract: A device for use with an electrically heated window to enable it to be used as a radio antenna has a bifilar wound choke (2) which allows passage of heater current while isolating radio signals from the heater power circuit. The device is connected to radio apparatus via an amplifier (13). The choke (2) and the input of the amplifier (13) are both of relatively low impedance. The choke (2) may be a pot-cored bifilar winding and the amplifier (13) may use a field effect transistor in its input stage connected in grounded gate configuration.

Abstract: An automobile antenna including a defogging heater wire and a conductor combined into a simple structure to accomplish a good FM reception. A capacitor which effects high-frequency grounding of the terminals of a defogging heater wire is installed between the terminals and a vehicle body; alternately, FM choke coils can be installed which prevents the heater wire from receiving high-frequency signals from a power source of the heater wire. The heater wire which resonates in the FM frequency band but not in the AM frequency band is inductively and capacitively coupled to the conductor which is installed on the surface of the window glass and resonates in the FM frequency band but not in the AM frequency band. The heater wire and conductor are installed in such a positional relationship that a double resonance is created.

Abstract: Disclosed is a pane antenna installed in a heated window pane of a motor vehicle to receive frequencies above the high frequency range. The antenna includes at least one wire-shaped first antenna conductor extending across parallel heating conductors of a heating field. The crossing points of the first antenna conductor with heating conductors are preferably in galvanic contact to create a capacitive antenna region along the first antenna conductor. The capacitive antenna region is coupled via a second antenna conductor extending also perpendicularly to the heating conductors, to an antenna terminal arranged on the window pane in proximity to a rim. The window pane is surrounded by a conductive frame and a grounding point is created on the frame opposite the antenna terminal.