Vehicle rear window glass antenna for transmission and reception of ultrashort waves

Claim 2

An antenna attached to a vehicle rear window glass for receiving and transmitting ultrashort waves, the window glass being provided with a set of defogging heater strips each of which extends horizontally so as to leave a space between the lowermost heater strip and the lower edge of the window glass, the antenna being arranged in said space and comprising: a primary antenna section which is a combination of a plurality of elongated elements connected to each other so as to form a closed plane figure having at least one and not more than four vertexes each of which is acutely angled and pointed upward and defines an upper end of the primary antenna section, and a plurality of elongated elements comprising a single horizontally elongated element which defines a bottom side of said closed plane figure; a secondary antenna section comprising a single horizontally elongated element which extends below said primary antenna section and has a horizontal length in the range from 30 to 400 mm; and a feeder which is a coaxial cable having an inner conductor and an outer conductor with insulation therebetween, said primary antenna section being connected with said inner conductor and said secondary antenna section being connected with said outer conductor; wherein said primary antenna section defines the perimeters of at least two triangles arranged in a row, said horizontally elongated element of the primary antenna section defining bottom sides of all of said at least two triangles.

Claim 3

An antenna according to claim 1, wherein said primary antenna section is arranged within a rectangular area ranging from 40 to 80 mm in horizontal width and from 40 to 80 mm in length perpendicular to the horizontal width.

Claim 4

An antenna according to claim 2, wherein a vertical center axis of the window glass passes through said rectangular area.

Claim 5

An antenna according to claim 2, wherein said rectangular area is horizontally distant from a vertical center axis of the window glass.

Claim 6

An antenna according to claim 1, wherein each of said vertexes of said primary antenna section is at a vertical distance of at least 5 mm from the lowermost heater strip.

Claim 7

An antenna according to claim 5, wherein said secondary antenna section is at a vertical distance of at least 10 mm from the lower edge of the window glass.

Claim 8

An antenna according to claim 1, wherein the horizontal length of said secondary antenna section is in the range from 100 to 300 mm.

Claim 9

An antenna according to claim 1, wherein said at least two triangles are identical in shape and size.

Claim 10

An antenna according to claim 1, wherein said at least two triangles are isosceles triangles.

Claim 11

An antenna according to claim 1, wherein said at least two triangles are symmetrical with respect to a vertical line.

Claim 12

An antenna according to claim 10, wherein each of said two triangles is a right-angled triangle having a vertical side extending upward from one end of said horizontally elongated element of the primary antenna section.

Claim 13

An antenna according to claim 1, further comprising an auxiliary antenna element which extends horizontally and is positioned below said primary antenna section and above said secondary antenna section.

Claim 14

An antenna according to claim 12, wherein said auxiliary antenna element is connected to said primary antenna section.

Claim 15

An antenna according to claim 12, wherein said auxiliary antenna element is connected to said secondary antenna section.

Claim 16

An antenna according to claim 1, wherein said secondary antenna section further comprises a supplementary element which is elongated and extends upward from one end of said horizontally elongated element of the secondary antenna section.

Claim 17

An antenna attached to a vehicle rear window glass for receiving and transmitting ultrashort waves the window glass being provided with a set of defogging heater strips each of which extends horizontally so as to leave a space between the lowermost heater strip and the lower edge of the window glass, the antenna being arranged in said space and comprising: a primary antenna section which is a combination of a plurality of elongated elements connected to each other so as to form a closed plane figure having at least one and not more than four vertexes each of which is acutely angled and pointed upward and defines an upper end of the primary antenna section, and a plurality of elongated elements comprising a single horizontally elongated element which defines a bottom side of said closed plane figure; a secondary antenna section comprising a single horizontally elongated element which extends below said primary antenna section and has a horizontal length in the range from 30 to 400 mm; and a feeder which is a coaxial cable having an inner conductor and an outer conductor with insulation therebetween, said primary antenna section being connected with said inner conductor and said secondary antenna section being connected with said outer conductor; wherein said primary antenna section has a shape of a character M, said horizontally elongated element of the primary antenna section extending from the bottom end of one leg of the character M to the bottom end of the other leg of the character M.

Claim 18

An antenna attached to a vehicle rear window glass for receiving and transmitting ultrashort waves the window glass being provided with a set of defogging heater strips each of which extends horizontally so as to leave a space between the lowermost heater strip and the lower edge of the window glass, the antenna being arranged in said space and comprising: a primary antenna section which is a combination of a plurality of elongated elements connected to each other so as to form a closed plane figure having at least one and not more than four vertexes each of which is acutely angled and pointed upward and defines an upper end of the primary antenna section, and a plurality of elongated elements comprising a single horizontally elongated element which defines a bottom side of said closed plane figure; a secondary antenna section comprising a single horizontally elongated element which extends below said primary antenna section and has a horizontal length in the range from 30 to 400 mm; and a feeder which is a coaxial cable having an inner conductor and an outer conductor with insulation therebetween, said primary antenna section being connected with said inner conductor and said secondary antenna section being connected with said outer conductor; wherein said primary antenna section has a shape of a character M, said horizontally elongated element of the primary antenna section extending from the bottom end of one leg of the character M to the bottom end of the other leg of the character M.

Claim 19

An antenna attached to a vehicle rear window glass for receiving and transmitting ultrashort waves, the window glass being provided with a set of defogging heater strips each of which extends horizontally so as to leave a space between the lowermost heater strip and the lower edge of the window glass, the antenna being arranged in said space and comprising: a primary antenna section which is a combination of a plurality of elongated elements connected to each other so as to form a closed plane figure having at least one and not more than four vertexes each of which is acutely angled and pointed upward and defines an upper end of the primary antenna section, and a plurality of elongated elements comprising a single horizontally elongated element which defines a bottom side of said closed plane figure; a secondary antenna section comprising a single horizontally elongated element which extends below said primary antenna section and has a horizontal length in the range from 30 to 400 mm; and a feeder which is a coaxial cable having an inner conductor and an outer conductor with insulation therebetween, said primary antenna section being connected with said inner conductor and said secondary antenna section being connected with said outer conductor; wherein said primary antenna section defines the perimeters of two adjacently arranged pentagons each of which consists of a rectangular lower part and a triangular upper part, said horizontally elongated element of the primary antenna section defining bottom sides of both of the two pentagons.

Claim 20

An antenna attached to a vehicle rear window glass for receiving and transmitting ultrashort waves, the window glass being provided with a set of defogging heater strips each of which extends horizontally so as to leave a space between the lowermost heater strip and the lower edge of the window glass, the antenna being arranged in said space and comprising: a primary antenna section which is a combination of a plurality of elongated elements connected to each other so as to form a closed plane figure having at least one and not more than four vertexes each of which is acutely angled and pointed upward and defines an upper end of the primary antenna section, and a plurality of elongated elements comprising a single horizontally elongated element which defines a bottom side of said closed plane figure; a secondary antenna section comprising a single horizontally elongated element which extends below said primary antenna section and has a horizontal length in the range from 30 to 400 mm; and a feeder which is a coaxial cable having an inner conductor and an outer conductor with insulation therebetween, said primary antenna section being connected with said inner conductor and said secondary antenna section being connected with said outer conductor; wherein said primary antenna section defines the perimeters of two adjacently arranged pentagons each of which consists of a rectangular lower part and a triangular upper part, said horizontally elongated element of the primary antenna section defining bottom sides of both of the two pentagons.