Antenna for mobile communication terminals
View Patent ↗An antenna comprising: a first substantially planar ground plate; a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate; a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate; two or more connectors for electrically connecting the second ground plate to ground; and one or more connectors for electrically connecting the first resonator to the second ground plate; wherein the first resonator and the second ground plate are connected to at least one of receiver means and transmitter means by antenna feeding means.
1. An antenna comprising:
a first substantially planar ground plate;
a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;
a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;
two or more connectors electrically connecting the second ground plate to the first ground plate; and
one or more connectors electrically connecting the first resonator to the second ground plate;
wherein:
the first resonator and the second ground plate are connected to at least one of a receiver and a transmitter by an antenna feed;
the first resonator and the second ground plate each have similar dimensions;
the first resonator is substantially aligned with the second ground plate; and
the second ground plate is positioned between the first ground plate and the first resonator.
2. An antenna according to claim 1 wherein one of the two or more connectors electrically connecting the second ground plate is a ground connection of the antenna feed.
3. An antenna according to claim 1 wherein at least one of the two or more connectors electrically connecting the second ground plate connects the second ground plate to ground.
4. An antenna according to claim 1 wherein the antenna feed comprises an outer connector providing a ground connection and an inner connector providing a positive or negative voltage connection.
5. An antenna according to claim 4 wherein the first resonator is connected to the inner connector of the antenna feed.
6. An antenna according to claim 1 further comprising a substantially planar parasitic resonator positioned adjacent the first resonator and in substantially the same plane as the first resonator.
7. An antenna according to claim 6 further comprising one or more connectors for connecting the parasitic resonator to the second ground plate.
8. An antenna according to claim 1 wherein the first resonator is shaped so as to comprise a dual-band or multi-band resonator.
9. An antenna according to claim 1 wherein the second ground plate is shaped so as to provide a further resonance in addition to resonances provided by other components of the antenna.
10. An antenna according to claim 9 wherein the second ground plate has one or more slots therein.
11. An antenna according to claim 9 wherein the antenna is configured to resonate in four frequency bands.
12. An antenna according to claim 10 wherein the antenna is configured to resonate in the USGSM850, EGSM900, DCS1800 and PCS1900 frequency bands.
13. A mobile communication terminal comprising an antenna, the antenna comprising:
a first substantially planar ground plate;
a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;
a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;
two or more connectors electrically connecting the second ground plate to the first ground plate; and
one or more connectors electrically connecting the first resonator to the second ground plate;
wherein:
the first resonator and the second ground plate are connected to at least one of a receiver and a transmitter by an antenna feed;
the first resonator and the second ground plate each have similar dimensions;
the first resonator is substantially aligned with the second ground plate; and
the second ground plate is positioned between the first ground plate and the first resonator.
14. A mobile communication terminal according to claim 13 wherein one of the two or more connectors electrically connecting the second ground plate is a ground connection of the antenna feed.
15. A mobile communication terminal according to claim 13 wherein at least one of the two or more connectors electrically connecting the second ground plate connects the second ground plate to ground.
16. A mobile communication terminal according to claim 13 wherein the antenna feed comprises an outer connector providing a ground connection and an inner connector providing a positive or negative voltage connection.
17. A mobile communication terminal according to claim 16 wherein the first resonator is connected to the inner connector of the antenna feed.
18. A mobile communication terminal according to claim 13 wherein the antenna further comprises a substantially planar parasitic resonator positioned adjacent the first resonator and in substantially the same plane as the first resonator.
19. A mobile communication terminal according to claim 18 wherein the antenna further comprises one or more connectors for connecting the parasitic resonator to the second ground plate.
20. A mobile communication terminal according to claim 13 wherein the first resonator is shaped so as to comprise a dual-band or multi-band resonator.
21. A mobile communication terminal according to claim 13 wherein the second ground plate is shaped so as to provide a further resonance in addition to resonances provided by other components of the antenna.
22. A mobile communication terminal according to claim 21 wherein the second ground plate has one or more slots therein.
23. A mobile communication terminal according to claim 21 wherein the antenna is configured to resonate in four frequency bands.
24. A mobile communication terminal according to claim 23 wherein the antenna is configured to resonate in the USGSM850, EGSM900, DCS1800 and PCS1900 frequency bands.
25. A mobile communication terminal according to claim 13 wherein a circuit board within the terminal comprises the first ground plate.
26. A mobile communication terminal according to claim 13 wherein a shielding comprises the first ground plate.
27. A mobile communication terminal according to claim 13 wherein a metal frame of the terminal comprises the first ground plate.
28. A mobile communication terminal according to claim 13 wherein a cover of the terminal substantially comprises metal.
29. An antenna for use in a mobile communications terminal having a first substantially planar ground plate, the antenna comprising:
a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;
a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;
two or more connectors electrically connecting the second ground plate to the first ground plate; and
one or more connectors electrically connecting the first resonator to the second ground plate;
wherein:
the first resonator and the second ground plate are connected to at least one of a receiver and a transmitter by an antenna feed;
the first resonator and the second ground plate each have similar dimensions;
the first resonator is substantially aligned with the second ground plate; and
the second ground plate is positioned between the first ground plate and the first resonator.
30. An antenna comprising:
a first substantially planar ground plate;
a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate;
a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;
two or more connectors electrically connecting the second ground plate to ground; and
one or more connectors electrically connecting the first resonator to the second ground plate;
wherein:
the first resonator and the second ground plate are connected to at least one of a receiver and a transmitter by an antenna feed;
the second ground plate is positioned between the first ground plate and the first resonator; and
the first resonator is substantially aligned with the second ground plate.
31. A mobile communication terminal comprising an antenna, the antenna comprising:
a first substantially planar ground plate;
a first substantially planar resonator positioned in a plane substantially parallel to the first ground plate:
a second substantially planar ground plate positioned in a plane substantially parallel to the first ground plate;
two or more connectors electrically connecting the second ground plate to ground; and
one or more connectors electrically connecting the first resonator to the second ground plate;
wherein:
the first resonator and the second ground plate are connected to at least one of a receiver and a transmitter by an antenna feed;
the second ground plate is positioned between the first ground plate and the first resonator; and
the first resonator is substantially aligned with the second ground plate.