US3845489A — Window antenna

Claim 1

Independent Claim 145 words

An AM-FM radio antenna for a radio receiver mounted in a vehicle having an opening defined by a metallic frame for a window, such as a windshield, comprising a window mounted in said frame, fine wire conductors applied to the window as a T-shaped branch and a generally U-shaped branch, and an output terminal for said branches and the feedline to the radio receiver centrally disposed on the window a short distance from such frame at the bottom edge of the window, the base of said T-shaped branch being connected to said terminal and the crossbar thereof being generally parallel to and spaced a short distance from said frame along the upper edge of the window and said U-shaped branch being connected at the center point thereof to said terminal and extending from said terminal in a path spaced a short distance from said frame.

Claim 2

Dependent Claim 145 words

An AM-FM radio antenna for a radio receiver mounted in a vehicle having an opening defined by a metallic frame for a window, such as a windshield, comprising a window mounted in said frame, fine wire conductors applied to the window as a T-shaped branch and a generally U-shaped branch, and an output terminal for said branches and the feedline to the radio receiver centrally disposed on the window a short distance from such frame at the bottom edge of the window, the base of said T-shaped branch being connected to said terminal and the crossbar thereof being generally parallel to and spaced a short distance from said frame along the upper edge of the window and said U-shaped branch being connected at the center point thereof to said terminal and extending from said terminal in a path spaced a short distance from said frame.

Claim 3

Dependent Claim 16 words

An antenna as defined in claim 1 wherein the U-shaped branch completely surrounds the T-shaped branch.

Claim 4

Dependent Claim 25 words

An antenna as defined in claim 1 wherein the free ends of the U-shaped branch are co-linear with the crossbar portion of the T-shaped branch.

Claim 5

Dependent Claim 28 words

An antenna as defined by claim 1 wherein the effective length of each half of the U-shaped branch is effected by replication in the vicinity of said terminal.

Claim 6

Dependent Claim 26 words

An aNtenna as defined by claim 1 wherein each half of the U-shaped branch is severed, the severed end lapped, and connected by a bridging conductor.

Claim 7

Dependent Claim 33 words

An antenna as defined by claim 1 comprising conductors applied to the window adjacent and parallel to the upright leg of the T-shaped branch and connected to the U-shaped branch near said terminal.

Claim 8

Dependent Claim 118 words

An AM-FM radio antenna for a radio receiver mounted in a vehicle having an opening defined by a metallic frame for a window, such as a windshield, comprising a window mounted in said frame, and fine wire conductors applied to the window as a T-shaped branch and a generally U-shaped branch, the conductor constituting said U-shaped branch being spaced a short distance from said frame and said T-shaped branch including a first conductor connected at one end to a central point of the U-shaped branch and extending transversely across the window and a second conductor connected centrally thereof to the other end of said first conductor and extending generally parallel to the frame at a short distance therefrom.

Claim 9

Dependent Claim 118 words

An AM-FM radio antenna for a radio receiver mounted in a vehicle having an opening defined by a metallic frame for a window, such as a windshield, comprising a window mounted in said frame, and fine wire conductors applied to the window as a T-shaped branch and a generally U-shaped branch, the conductor constituting said U-shaped branch being spaced a short distance from said frame and said T-shaped branch including a first conductor connected at one end to a central point of the U-shaped branch and extending transversely across the window and a second conductor connected centrally thereof to the other end of said first conductor and extending generally parallel to the frame at a short distance therefrom.

Claim 10

Dependent Claim 24 words

An antenna as defined in claim 7 wherein the feedline for the radio receiver is connected to said central point of the U-shaped branch.

Claim 11

Dependent Claim 27 words

An antenna as defined by claim 8 wherein said branches are separately phase-tuned for FM band frequency signals at the point of connection of the two branches.

Claim 12

Dependent Claim 20 words

An antenna as defined by claim 7 comprising a terminal on the window connecting said branches at said central point.

Claim 13

Dependent Claim 22 words

An antenna as defined by claim 7 which is phase tuned for reception by the radio receiver of FM band frequency signals.

Claim 14

Dependent Claim 70 words

An antenna as defined by claim 7 wherein the difference in the phase angles of the voltages of the FM band frequency signals induced in said branches from a given signal source at any selected angle of rotation of the window relative to said source about a vertical axis is less than 90*, whereby said voltages are additive at said central point in all such rotative positions of the window.

Claim 15

Dependent Claim 95 words

An AM-FM windshield antenna comprising a transparent window, a T-shaped conductor applied to the window with the vertical bar thereof adjacent the middle of the window and the horizontal bar thereof adjacent the upper edge of the window, a U-shaped conductor applied to the window, said U-shaped conductor extending adjacent the lower edge of the window and at least part-way up the side edges of the window adjacent those side edges, and conductive means connecting the vertical bar of the T-shaped conductor near its lower end and the U-shaped conductor together to a common terminal.

Claim 16

Dependent Claim 95 words

An AM-FM windshield antenna comprising a transparent window, a T-shaped conductor applied to the window with the vertical bar thereof adjacent the middle of the window and the horizontal bar thereof adjacent the upper edge of the window, a U-shaped conductor applied to the window, said U-shaped conductor extending adjacent the lower edge of the window and at least part-way up the side edges of the window adjacent those side edges, and conductive means connecting the vertical bar of the T-shaped conductor near its lower end and the U-shaped conductor together to a common terminal.

Claim 17

Independent Claim 189 words

A method for determining the layout of an AM-FM broadband radio antenna comprising fine wire conductors applied to the window of a vehicle for use with a radio and feedline therefor mounted on the vehicle which comprises applying to the window conductors forming a U-shaped branch following the peripheral shape of and spaced a short distance from a metallic frame embracing the periphery of the window and a T-shaped branch within the U-shaped branch, the base of said T-shaped branch being connected at a common terminal to the center of the U-shaped branch and said feedline, and the crossbar of the T-shaped branch being generally parallel to and spaced a short distance from an adjacent part of said frame, varying the length of said conductors to phase tune the connected branches for reception of an AM band frequency signal, thereafter varying the length of the conductors to phase tune each said branch separately for reception of an FM band frequency signal, and finally further varying the length of the conductors to phase tune the connected branches to phase tune the same for reception of an FM band frequency signal.

Claim 18

Independent Claim 189 words

A method for determining the layout of an AM-FM broadband radio antenna comprising fine wire conductors applied to the window of a vehicle for use with a radio and feedline therefor mounted on the vehicle which comprises applying to the window conductors forming a U-shaped branch following the peripheral shape of and spaced a short distance from a metallic frame embracing the periphery of the window and a T-shaped branch within the U-shaped branch, the base of said T-shaped branch being connected at a common terminal to the center of the U-shaped branch and said feedline, and the crossbar of the T-shaped branch being generally parallel to and spaced a short distance from an adjacent part of said frame, varying the length of said conductors to phase tune the connected branches for reception of an AM band frequency signal, thereafter varying the length of the conductors to phase tune each said branch separately for reception of an FM band frequency signal, and finally further varying the length of the conductors to phase tune the connected branches to phase tune the same for reception of an FM band frequency signal.

Claim 19

Dependent Claim 31 words

The method as defined in claim 14 wherein the T-shaped branch is separately phase tuned to supply a signal which exceeds that supplied by the U-shaped branch as separately phase tuned.

Claim 20

Dependent Claim 38 words

The method as defined in Claim 14 wherein the final tuning of the connected branches is such that the signal output of the combined branches has more uniform directivity than the signal developed separately by the T-shaped branch.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-10-28	1978-04-29	1978-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-10-28	1982-04-29	1982-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-10-28	1986-04-29	1986-10-29	$7700.00	Window Closed / Lapsed

Window antenna

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