Claims
- 1. A diversity glass antenna for an automobile comprising:
- a single pole antenna position within a window of the automobile;
- a dipole antenna position within the window, which is arranged as a loop-like form having an opening to surround the single pole antenna wherein the single pole antenna has a feed point and the dipole antenna has a pair of feed points;
- a defogger positioned in the window and having bus bars and heater lines functioning as the dipole antenna, and a choke coil connected between the defogger and a ground potential, wherein two feed points connected to the defogger are provided at a side portion of the window, a line connecting one of the feed points to one of the bus bars of the defogger is extended to a central portion of the window and is turned back to connect to the bus bar;
- a selecting means for selecting a stronger signal received by the single pole antenna and the dipole antenna; and
- wherein, said diversity glass antenna generates an approximately uniform directionality characteristic in all polarization planes.
- 2. A diversity glass antenna for an automobile, comprising:
- a dipole antenna positioned within a window of the automobile;
- a single pole antenna positioned within the window, which is arranged as a loop like form to surround the dipole antenna wherein the single pole antenna has a feed point and the dipole antenna has a pair of feed points; and
- a selecting means for selecting a stronger signal received by the dipole antenna and the single pole antenna.
- 3. A diversity glass antenna according to claim 2, wherein a feed point is directly formed at a portion of the single pole antenna in a loop like form, and the feed point of the single pole antenna is arranged near the pair of feed points of the dipole antenna.
- 4. A diversity glass antenna according to claim 3, further comprising:
- the single pole antenna capacitively coupled to the dipole antenna.
- 5. A diversity glass antenna according to claim 2, wherein the single pole antenna has a feed point positioned not more than 200 mm from the feed points of the dipole antenna.
- 6. A diversity glass antenna according to claim 2, further comprising a defogger positioned in the window and having bus bars and heater lines functioning as the dipole antenna, and a choke coil connected between the defogger and a ground potential.
- 7. A diversity glass antenna according to claim 6, wherein the single pole antenna is capacitively coupled to the dipole antenna.
- 8. A diversity glass antenna according to claim 6, further comprising:
- a shorting line connecting a plurality of heating/antenna lines in a defogger such that a change of impedance of the dipole antenna is constant with respect to different frequencies.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-101618 |
Mar 1992 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/038,258, filed on Mar. 24, 1993, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (6)
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CAX |
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EPX |
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JPX |
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Entry |
Patent Abstracts Of Japan, vol. 11, No. 209 (E-521), Jul. 7, 1987, JP-A-62-030407, Feb. 9, 1987. |
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Continuations (1)
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Number |
Date |
Country |
Parent |
38258 |
Mar 1993 |
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