Central Glass Company, Limited

Tokio Tsukada

Kazuya Nishikawa

Masao Shinnai

Tohru Hirotsu

Yoji Nagayama

Shingo Tadokoro

Junichiro Ieiri

Hiroshi Inaba

Kazuhiko Fujii

Tamotsu Saitoh

Hiroyuki Fujii

Tohru Hiroysu

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. According to another aspect of the present invention, the antenna comprises a main element having two horizontal conductive strips and a vertical strip connecting the horizontal strips at one ends located nearer to a widthwise center of the space, and an auxiliary element having a conductive strip made up of a vertical portion extending upward from upper one of the horizontal conductive strips of the main element to have an upper end and a horizontal portion extending between the upper end of the vertical portion and a feed point located at a widthwise marginal area of the space.

Automotive window glass antenna

This invention provides a vehicle window glass antenna arranged in a space left below defogging heater strips for transmission and reception of ultrashort waves used for mobile phones and/or personal radios. The antenna section has a primary antenna which is a combination of a plurality of elongate elements connected to each other so as to form a closed plane figure having one to four vertexes each of which is acutely angled and pointed upward and becomes an upper end of the primary antenna. The plurality of elongate elements includes a single horizontally elongate element which becomes the bottom side of the plane figure. The antenna includes a secondary antenna section which is essentially a horizontally elongate element positioned below the primary antenna section. The antenna feeder is a coaxial cable, and the primary and secondary antenna sections are connected with the inner and outer conductors of the coaxial cable, respectively.

Vehicle rear window glass antenna for transmission and reception of

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. The first element further has in an area of the space above the first antenna or in a space defined between the upper and lower ends of the first antenna, at least one horizontal conductive strip or a T-shaped or inverted T-shaped conductive strip assembly having a longer horizontal strip portion and a shorter vertical strip portion, or at least two horizontal conductive strips connected at opposite ends by vertical conductive strips to constitute a rectangular loop, or at least two horizontal conductive strips connected at one ends by a vertical conductive strip to constitute a  -shape. The second element is arranged in an area of the space under the heater element and consists of a horizontal conductive strip and a vertical conductive strip.

The invention relates to an antenna on a vehicle rear window glass for the reception of FM radio broadcasting and TV broadcasting in both the VHF and UHF bands. The window glass is provided with defogging heater strips, and the antenna uses a space left above the heater strips. The antenna is constructed of a plurality of linear elements comprising (A) a combination of two primary elements, which are spaced from each other in the direction widthwise of the window glass and each of which has two parallel horizontal parts and at least one relatively short vertical part connecting the two horizontal parts at their ends, and a linear conductor connecting the two primary elements to each other, (B) a secondary element having a vertical part extending upward from a selected part of the combination (A) and a horizontal part extending from the upper end of the vertical part toward a side edge of the window glass and (C) a reactance element which extends downward from the extended end of the horizontal part of the secondary element (B) and makes at least two turns so as to have at least one L-shaped portion in which one leg part is parallel to another part of the reactance element. At the extended end of the reactance element (C) the antenna is connected to a feed point which is located near the side edge of the window glass.

Wide-band antenna on vehicle rear window glass

The invention provides a vehicle window glass antenna for transmission and reception of ultrashort waves used for mobile phones and/or personal radios. The antenna has a primary antenna which is a combination of at least two vertical (in the sense of perpendicular to a horizontal line) elements and at least two horizontal elements each of which directly connects with at least one of the vertical elements and a secondary antenna which is essentially a horizontally elongate element located in a space between the primary antenna and the lower or upper edge of the window glass. The primary antenna is arranged within a rectangular area having a limited horizontal width and a limited length, and the horizontal element of the secondary antenna has a limited length. The antenna feeder is a coaxial cable, and the primary antenna and the secondary antenna are connected with the inner conductor and the outer conductor of the coaxial cable, respectively. In a preferred embodiment the major part of the primary antenna is in the form of a rectangular grid.

Vehicle window glass antenna for transmission and reception of

The invention relates to an antenna on a vehicle rear window glass for the reception of FM radio broadcasting and TV broadcasting in both the VHF and UHF bands. The window glass is provided with defogging heater strips, and the antenna uses a space left above the heater strips. The antenna is essentially comprised of an L-shaped primary element with a vertical part on or close to the vertical center axis of the window glass and a horizontal part extending from the lower end of the vertical part, an impedance matching element located on one side of the vertical part of the primary element and an auxiliary element extending horizontally above the impedance matching element. The impedance matching element has two parallel horizontal parts, at least one vertical part connecting the two horizontal parts to each other and two extensions which extend vertically from the two horizontal parts, respectively, and bend to connect to the vertical part of the primary element. The auxiliary element is connected at one end thereof to the vertical part of the primary element directly or via a portion of the impedance matching element. The other end of the auxiliary element is connected to a feed point located near to a side edge of the window glass.

Antenna on vehicle rear window glass

The invention relates to an antenna attached to a vehicle roof glass, i.e. a glass plate fitted in an opening of the roof of a vehicle body such as an automobile body, for receiving FM radio and TV broadcast waves in both the VHF band and the UHF band. Essentially the antenna is comprised of a main element which is a conductive strip attached to the roof glass and bent so as to make a closed plane figure, a feed point attached to the roof glass and a connection line which connects the main element to the feed point and extends parallel or nearly parallel to the longitudinal center axis of the vehicle body. The total length of the main element is from 200 to 1500 mm. For example, the main element makes a rectangle in a central region of the roof glass with two opposite sides of the rectangle parallel to the aforementioned center axis. Optionally the antenna may include an auxiliary element which is a conductive strip attached to the roof glass and connected to the feed point. For example, auxiliary element may be an angled segment which makes two or three sides of a rectangle.

Wide-band antenna on vehicle roof glass

The invention relates to an antenna on a vehicle rear window glass for the reception of FM radio broadcasting and TV broadcasting in both the VHF and UHF bands. The window glass is provided with defogging heater strips, and the antenna uses a space left above the heater strips. The antenna is a combination of a main antenna and a secondary antenna, and every element of the antenna is a conductive strip. The main antenna has at least two horizontally extending primary elements which are parallel to and at a relatively short distance from each other. Each of the primary elements has a length of 300-550 mm and is connected at its one end to the other(s) by a subsidiary element arranged perpendicular to the primary elements. The secondary antenna has a middle part, which is relatively long and extends horizontally, and two extension parts which extend from the two opposite ends of the middle part parallel and close to the two opposite side edges of the window glass, respectively. The middle part is close to the upper edge of the window glass or close to the uppermost heater strip. The secondary antenna is connected to the main antenna by a straight extension of the subsidiary element of the main antenna.

The invention relates to an antenna attached to a vehicle roof glass, i.e. a glass plate fitted in an opening of the roof of a vehicle body, for receiving FM radio and TV broadcast waves in both the VHF band and the UHF band. Essentially the antenna is comprised of a main element which is combination of two linear segments each of which is a conductive strip attached to the roof glass, a feed point attached to the roof glass and a connection line which connects the main element to the feed point and extends parallel or nearly parallel to the longitudinal center axis of the vehicle body. The two linear segments of the main element extend respectively obliquely with respect to the aforementioned center axis and intersect each other. It is suitable that the two linear segments have the same length and bisect each other. Optionally the antenna may include an auxiliary element attached to the roof glass and connected to the feed point. For example, the auxiliary element may be a combination of two linear segments intersecting each other or an angled segment having at least one L-shaped portion.

Vehicle roof glass antenna for reception of FM radio and TV broadcasting

The invention relates to a wide-band antenna attached to a vehicle window glass such as an automobile windshield for receiving FM radio and TV broadcast waves. Each element of the antenna is a conductive strip. The antenna is comprised of a main element and an impedance matching element to make a resistance component of the impedance of the antenna equal to or greater than that of coaxial cable used as the feeder for the antenna. The main element has a vertical part in a widthwise central region of the window glass with its one end at a short distance from either the lower edge or the upper edge of the glass and a horizontal part which extends from that end of the vertical part to a side marginal region of the glass. A feed point of the antenna is in a lower end portion of the side marginal region of the glass. When the horizontal part is close to the lower edge it terminates at the feed point, and the impedance matching element is connected to the horizontal part. When the horizontal part is close to the upepr edge a supplementary part of the main element extends in the side marginal region from the end of the horizontal part to the feed point, and the impedance matching element is connected to the supplementary part.

Vehicle window glass antenna suited to reception of FM radio and TV

On a vehicle window glass provided with defogging heater strips, such as automobile rear window glass, the invention provides an antenna of improved efficiency for receiving FM and AM radio broadcast waves. In an area left above the heater strips the antenna is constructed of at least three elements each of which is a conductive strip. The first and main element is a T-shaped element with its horizontal part at a short distance from the upper edge of the window glass. On one side of the vertical part of the T-shaped element, the second element extends horizontally from a point on that vertical part. The third element, which is located on the other side of that vertical part, has a primary part which constitutes at least three sides of a horizontally elongate rectangle and a secondary part which extends horizontally from a point on the vertical part of the T-shaped element and connects with the primary part. A lead extends from a side of the rectangle to a feed point. The antenna is coupled with the heater strips by a conductive line which connects with the heater strips and has a horizontal part that makes capacitive coupling with the horizontal part of the T-shaped element.

Vehicle window glass antenna coupled with defogging heater

The invention relates to a receiving antenna disposed on or in a vehicle window glass such as the rear window glass or the windshield of an automobile. The antenna comprises, as a principal antenna element, a transparent and conductive film in the shape of a quadrilateral having two substantially parallel sides one of which is at a distance of 15-25 mm from the upper edge of the window glass and the other at a distance of 15-25 mm from the lower edge. The quadrilateral film may be so wide that the remaining two sides thereof extend along the two side edges of the window glass, respectively, at a distance of 15-25 mm from the respective side edges. This is suitable for reception of not only FM radio broadcast waves in the 76-90 MHz or 88-108 MHz band and TV broadcast waves in the 90-222 MHz band but also AM radio broadcast waves. When the antenna is mostly for reception of FM radio broadcast waves and/or TV broadcast waves, it is suitable that the transparent and conductive film is in the shape of a rectangle which is elongate in the direction substantially perpendicular to the upper and lower edges of the window glass and has a lateral width in the range from 50 to 250 mm.

Vehicle window glass antenna using transparent conductive film

The invention provides an antenna disclosed on or in a vehicle window glass, e.g. an automobile rear window glass, for receiving FM broadcast waves. The antenna has a main element, which extends horizontally from a side marginal region of the glass pane to a middle region but does not intersect the longitudinal center axis of the glass pane, and a phase adjusting element which extends parallel to the main element from the same side marginal region and is connected at its end in the side marginal region to the main element by a perpendicular line. The feed point is connected to an arbitrary point on the perpendicular line. The main element may be folded so as to have at least one horizontally extending turn-back part. The phase adjusting element may extend to the opposite side marginal area of the glass pane and may be folded so as to have a turn-back part which extends horizontally without intersecting the center axis of the glass pane. This antenna is almost non- directional and is high in gain over the entire range of the 76-90 MHz band and the 88-108 MHz band.

Growing community of inventors

Matsusaka, Japan

Tokio Tsukada