Vehicle window antenna with parasitic slot transmission line
First Claim
1. A vehicle window antenna for receiving radio waves of a predetermined wavelength in a vehicle having an electrically conducting body forming a window with a window glass disposed therein, the window having a window edge surrounding the window and comprising a horizontal upper edge portion, the antenna comprising an electrically conducting entity affixed to the window glass, the entity comprising, in combination:
- a horizontally elongate principal element substantially parallel to and spaced from the upper edge portion of the window and having an effective horizontal length of an odd multiple of one quarter of the predetermined wavelength;
a connecting element connected to the principal element and having a horizontal connecting portion spaced below the principal element by an amount sufficient that no significant slot transmission line is formed therewith; and
an impedance matching element in the form of a ribbon having one end connected to the connecting element and extending along but spaced from the window edge so as to electrically couple with the window edge to form a slot transmission line therewith, the impedance matching element having a length of an integer multiple of one half the predetermined wavelength, the slot transmission line being parasitically coupled to the principal element by the connecting element.
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Accused Products
Abstract
A vehicle window antenna for receiving radio waves of a predetermined wavelength comprises an electrically conducting entity affixed to the window glass having a horizontally elongate principal element having an effective horizontal length of an odd multiple of one quarter of the predetermined wavelength and an impedance matching element having a length of a multiple of one half the predetermined wavelength, extending along but spaced from the edge of the window so as to form a slot transmission line therewith, and parasitically coupled to the principal element by a connecting element. The impedance matching element is an extended ribbon which may leave most of the viewing area of the window free. Therefore, it uses significantly less of the material from which the antenna itself is made; it may be made of non-transparent as well as transparent material; and it provides great flexibility of design, with a number of different embodiments and variations.
43 Citations
11 Claims
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1. A vehicle window antenna for receiving radio waves of a predetermined wavelength in a vehicle having an electrically conducting body forming a window with a window glass disposed therein, the window having a window edge surrounding the window and comprising a horizontal upper edge portion, the antenna comprising an electrically conducting entity affixed to the window glass, the entity comprising, in combination:
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a horizontally elongate principal element substantially parallel to and spaced from the upper edge portion of the window and having an effective horizontal length of an odd multiple of one quarter of the predetermined wavelength; a connecting element connected to the principal element and having a horizontal connecting portion spaced below the principal element by an amount sufficient that no significant slot transmission line is formed therewith; and an impedance matching element in the form of a ribbon having one end connected to the connecting element and extending along but spaced from the window edge so as to electrically couple with the window edge to form a slot transmission line therewith, the impedance matching element having a length of an integer multiple of one half the predetermined wavelength, the slot transmission line being parasitically coupled to the principal element by the connecting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification