Electronically tuned active antenna apparatus

• US 6,509,875 B1
• Filed: 09/19/2001
• Issued: 01/21/2003
• Est. Priority Date: 09/19/2001
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Nair, Vijay K., El-Ghazaly, Samir
• Primary Examiner(s): NGUYEN, HOANG V
• Application Number:
  US09/955,895
• Time in Patent Office: 489 Days
• Field of Search: 343/700.MS, 343/745
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 23/00 Antennas with active circuits or circuit elements integrated within them or attached to them
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

An electrically active antenna apparatus comprising a substrate, a RF feed positioned on the substrate, a radiator element positioned on the substrate and adjacent to the RF feed such that the radiator element and the RF feed are electromagnetically coupled, and a plurality of active devices that make electrical contact with the radiator element. The plurality of active devices are biased to actively tune the resonance frequency of the radiator element.

Claims

1. An electrically active antenna apparatus having a modifiable operational frequency as a function of radiative element form factor and positional location of active device elements with respect to at least one radiative element, comprising:

a substrate;

a RF feed positioned on the substrate;

a radiator element positioned on the substrate and adjacent to the RF feed such that the radiator element and the RF feed are electromagnetically coupled; and

at least one of said active elements positioned on at least one corner of a patch antenna, wherein said active device makes peripheral electrical contact with the radiator element.

2. An electrically active antenna apparatus as claimed in claim 1 further including a plurality of active devices that make electrical contact with the radiator element.

3. An electrically active antenna apparatus as claimed in claim 2 wherein the plurality of active devices include a varactor.

4. An electrically active antenna apparatus as claimed in claim 2 wherein the plurality of active devices include a negative differential resistance device.

5. An electrically active antenna apparatus as claimed in claim 2 wherein the plurality of active elements include a resonant tunneling diode.

6. An electrically active antenna apparatus as claimed in claim 2 wherein the plurality of active elements includes a MEMS device.

7. An electrically active antenna apparatus as claimed in claim 1 wherein the radiator element is one of a dipole antenna, a monopole antenna, a microtrip antenna, a slot antenna, and a patch antenna.

8. An electrically active antenna apparatus as claimed in claim 1 wherein the RF feed is electromagnetically coupled with the radiator element so that an electromagnetic signal can travel to and from the radiator element.

9. An electrically active antenna apparatus as claimed in claim 8, wherein the RF feed is electromagnetically coupled to the radiator element by using one of a capacitive coupler, a coaxial coupler, and a microstrip.

10. An electrically active antenna apparatus having a modifiable operational frequency as a function of radiative element form factor and positional location of active device elements with respect to at least one radiative element, comprising:

a substrate;

a RF feed positioned on the substrate;

a patch antenna with a width and a length positioned on the substrate and adjacent to the RF feed such that the patch antenna and the RF feed are electromagnetically coupled; and

at least one of said active elements positioned on at least one corner of the patch antenna, wherein said plurality of active devices make peripheral electrical contact with the patch antenna.

11. An electrically active antenna apparatus as claimed in claim 10 wherein the patch antenna has a plurality of corners and a plurality of edges.

12. An electrically active antenna apparatus as claimed in claim 11 wherein the RF feed is electromagnetically coupled to the radiator element by using one of a capacitive coupler, a coaxial coupler, and a microstrip.

13. An electrically active antenna apparatus as claimed in claim 10 wherein the RF feed is electromagnetically coupled with the radiator element so that an electromagnetic signal can travel to and from the radiator element.

14. An electrically active antenna apparatus as claimed in claim 10 wherein the plurality of active elements has at least one active element positioned on at least one edge of the patch antenna.

15. An electrically active antenna apparatus as claimed in claim 10 wherein the plurality of active elements include a varactor.

16. An electrically active antenna apparatus as claimed in claim 10 wherein the plurality of active elements include a negative differential resistance device.

17. An electrically active antenna apparatus as claimed in claim 10 wherein the plurality of active elements Include a MEMS device.

18. An electrically active antenna apparatus as claimed in claim 10 wherein the plurality of active elements include a resonant tunneling diode.

19. A method of forming an electrically tunable active antenna apparatus having a modifiable operational frequency as a function of radiative element form factor and positional location of active device elements with respect to at least one radiative element, comprising the steps of:

providing a substrate;

forming a RF feed positioned on the substrate;

forming a patch antenna with a resonant frequency positioned on the substrate and adjacent to the RF feed such that the patch antenna and the RF feed are electromagnetically coupled;

forming a plurality of active devices that make peripheral electrical contact with the patch antenna, wherein at least one of said active elements is positioned on at least one corner of the patch antenna; and

applying a voltage bias to the plurality of active devices to actively tune the resonant frequency of the patch antenna.

20. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the patch antenna is rectangular in shape.

21. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the RF feed is electromagnetically coupled with the radiator element so that an electromagnetic signal can travel to and from the radiator element.

22. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements has at least one active element positioned on at least one edge of the patch antenna.

23. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements include a device or apparatus that can actively change the resonance frequency of the patch antenna.

24. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements include a varactor.

25. A method of forming a electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements Include a negative differential resistance device.

26. A method of forming electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements include a resonant tunneling diode.

27. A method of forming an electrically tunable active antenna apparatus as claimed in claim 19 wherein the plurality of active elements include a MEMS device.