Claims
- 1. A diversity glass antenna for an automobile comprising:
- a defogger positioned within a window of the automobile and having bus bars and heater lines functioning as a dipole antenna;
- a choke coil connected between the defogger and a ground potential;
- a single pole antenna positioned within the window so as to be capacitively coupled to the defogger;
- a first antenna line extending from a first bus bar or a heater line at a portion near the first bus bar;
- a second antenna line extending from a second bus bar or a heater line at a portion near the second bus bar, wherein the first and second antenna lines are so arranged that the length of the lines is the same and they surround the single pole antenna;
- a first feed point, a second feed point and a third feed point which is for the single pole antenna, positioned within the window at or near an upper central portion of the window;
- the first feed point connected with an end of the first antenna line and the second feed point connect with an end of the second antenna line so that an opening is formed between the first feed point and the second feed point,
- a selecting means for the selecting a stronger signal received by the single pole antenna and the defogger.
- 2. A diversity glass antenna according to claim 1, further comprising:
- a shorting line connecting a plurality of said heating/antenna lines of the defogger such that a change of impedance of the dipole antenna is constant with respect to different frequencies.
- 3. A diversity glass antenna according to claim 1, wherein the feed point of the single pole antenna is positioned near the pair of feed points of the dipole antenna so that the feed point of the single pole antenna is between the pair of feed points of the dipole antenna.
- 4. A diversity glass antenna for an automobile comprising;
- a single pole antenna including an antenna line of a loop-like form which is positioned within a window of the automobile;
- a dipole antenna positioned within the window, which is arranged as an entire or partial loop-like form having an opening so as to surround the single pole antenna;
- the dipole antenna having an antenna line both ends of which are connected to respective feed points of the dipole antenna wherein said opening is formed between the both feed points of the dipole antenna;
- the single pole antenna having a single feed point; and
- a selecting means for selecting a stronger signal received by the single pole antenna and the dipole antenna.
- 5. A diversity glass antenna according to claim 4, wherein the feed point of the single pole antenna is positioned near the pair of the feed points of the dipole antenna so that the feed point of the single pole antenna is between the pair of the feed points of the dipole antenna.
- 6. A diversity glass antenna according to claim 4, wherein said single pole antenna is capacitively coupled to the dipole antenna.
- 7. A diversity glass antenna according to claim 4, wherein said single pole antenna has said feed point positioned not more than 200 mm from the feed points of the dipole antenna.
- 8. A diversity glass antenna according to claim 4, further comprising:
- a defogger positioned within the window, having bus bars and heater lines, and functioning as a dipole antenna and
- a choke coil connected between the defogger and a ground potential.
- 9. A diversity glass antenna according to claim 4, further comprising:
- a defogger positioned within the window and having bus bars and heater lines, which is capacitively coupled to the dipole antenna, and
- a choke coil connected between the defogger and a ground potential.
- 10. A diversity glass antenna according to claim 4, further comprising;
- an adjusting line positioned near the central portion of the loop-like antenna line of the single pole antenna so as to short-circuit the loop-like antenna line.
- 11. A diversity glass antenna for an automobile comprising;
- a defogger positioned within a window of the automobile, having bus bars and heater lines and functioning as a single pole antenna;
- a choke coil connected between the defogger and a ground potential;
- a dipole antenna positioned within the window, which is in a loop-like form having an opening so as to surround the defogger;
- the dipole antenna having first and second feed points;
- a third feed point positioned within the window, which is electrically connected to the defogger, and
- a selecting means for selecting stronger signal received by the defogger and the dipole antenna.
- 12. A diversity glass antenna according to claim 11, wherein an antenna line extends from a portion at or near the center of the uppermost portion of the defogger, and an end of the antenna line is connected to said third feed point.
- 13. A diversity glass antenna according to claim 11, wherein an antenna line connecting a first bus bar or a heater line at a portion near the first bus bar to a second bus bar or a heater line at a portion near the second bus bar is positioned within the window so as to extend along an upper periphery of the window, and the antenna line is connected to the third feed point.
- 14. A diversity glass antenna according to claim 11, wherein an antenna line is connected to the third feed point and is capacitively coupled to the defogger whereby the third feed point is electrically connected to the defogger.
- 15. A diversity glass antenna according to claim 11, wherein said dipole antenna is capacitively coupled to the defogger.
- 16. A diversity glass antenna for an automobile comprising:
- a defogger positioned within a window of the automobile and having bus bars and heater lines;
- a choke coil connected between the defogger and a ground potential;
- a dipole antenna, positioned within the window and in a space above the defogger, which is in a loop-like form having an opening;
- the dipole antenna having an antenna line both ends of which are connected to respective feed points positioned at or near the upper central portion of the window wherein said opening is formed between the both feed points;
- a single pole antenna positioned within the window and in a space below the defogger, the single pole antenna having a feed point;
- the single pole antenna and the dipole antenna being capacitively coupled to the defogger; and
- a selecting means for selecting a stronger signal received by the single pole antenna and the dipole antenna.
- 17. A diversity glass antenna according to claim 16, further comprising:
- a shorting line connecting a plurality of said heating/antenna lines of the defogger such that a change of impedance of the dipole antenna is constant with respect to different frequencies.
- 18. A diversity glass antenna for an automobile comprising;
- a defogger positioned within a window of the automobile and having bus bars and heater lines;
- a choke coil connected between the defogger and a ground potential;
- a dipole antenna, positioned within the window and in a space above the defogger, which is in a loop-like form having an opening;
- the dipole antenna having an antenna line both ends of which are connected to respective feed points positioned near the upper central portion of the window wherein said opening is formed between the both feed points;
- a single pole antenna positioned inside the loop-like antenna line of the dipole antenna, the single pole antenna having a feed point;
- the dipole antenna being capacitively coupled to the defogger; and
- a selecting means for selecting a stronger signal received by the single pole antenna and the dipole antenna.
- 19. A diversity glass antenna according to claim 18, further comprising:
- an adjusting line positioned near the central portion of the loop-like antenna line of the single pole antenna so as to short-circuit the loop-like antenna line.
- 20. A diversity glass antenna according to claim 18, wherein the feed point of the single pole antenna is positioned near the pair of the feed points of the dipole antenna so that the feed point of the single pole antenna is between the pair of the feed points of the dipole antenna.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-101618 |
Mar 1992 |
JPX |
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Parent Case Info
This is a Continuation, of application Ser. No. 08/361,462 filed on Dec. 21, 1994, now U.S. Pat. No. 5,581,264; which is a continuation of Ser. No. 08/038,258 filed on Mar 24, 1993, abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3220279 |
Dec 1983 |
DEX |
0050602 |
May 1981 |
JPX |
Continuations (2)
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Number |
Date |
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Parent |
361462 |
Dec 1994 |
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Parent |
38258 |
Mar 1993 |
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