Method for enhancing an antenna performance, antenna, and apparatus

1. A method comprising:

modifying a property of an antenna substrate by using an ultrasonic field,

wherein at least a portion of said antenna substrate comprises magnetic particles of which at least some of said magnetic particles each have a lamest dimension that is less than one micron.

2. The method according to claim 1 , wherein at least some of said magnetic particles each have a refractive index differing from a refractive index of said at least a portion of said antenna substrate.

3. The method according to claim 2 , wherein said magnetic particles are surrounded by a dielectric fluid, which constitutes said at least a portion of said antenna substrate.

4. The method according to claim 3 , wherein said method further comprises:

arranging said magnetic particles in said at least a portion of said antenna substrate by said ultrasonic field for modifying said property of said at least a portion of said antenna substrate.

5. The method according to claim 4 , wherein said arranging magnetic particles in said at least a portion of said antenna substrate comprising

applying said ultrasonic field into said at least a portion of said antenna substrate for concentrating said magnetic particles in areas of a high pressure and

removing said ultrasonic field for distributing said magnetic particles evenly in said at least a portion of said antenna substrate.

6. The method according to claim 5 , wherein said arranging magnetic particles in said at least a portion of said antenna substrate further comprises:

establishing a standing wave into said fluid constituting said at least a portion of said antenna substrate for achieving at least one nodal plane in which said magnetic particles concentrate.

7. The method according to claims 6 , wherein said arranging said magnetic particles in said at least a portion of said antenna substrate further comprises:

adjusting a frequency of said ultrasonic field for controlling a number of said nodal planes of said standing wave in said at least a portion of said antenna substrate.

8. The method according to claim 1 , wherein said property of said antenna substrate is a magnetic permeability or dielectric constant.

9. An antenna comprising:

an antenna substrate having a property, which is modifiable by an ultrasonic field,

wherein at least a portion of said antenna substrate comprises magnetic particles of which at least some of said magnetic particles each have a largest dimension that is less than one micron.

10. The antenna according to claim 9 , wherein at least some of said magnetic particles each have a refractive index differing from a refractive index of said at least a portion of said antenna substrate.

11. The antenna according to claim 10 , wherein said magnetic particles are surrounded by a dielectric fluid, which constitutes said at least a portion of said antenna substrate.

12. The antenna according to claim 11 , wherein at least a portion of said antenna substrate is capable of establishing a standing wave at an ultrasonic frequency.

13. The antenna according to claim 12 , wherein said magnetic particles in said at least a portion of said antenna substrate are arranged by said ultrasonic field for modifying said property of said at least a portion of said antenna substrate.

14. The antenna according to claim 9 , wherein said modified property of said antenna substrate is a magnetic permeability or dielectric constant.

15. The antenna according claim 9 , wherein said antenna is a patch antenna comprising said modified antenna substrate between a patch and a ground plane.

16. An apparatus comprising:

an antenna substrate having a property, which is modifiable by an ultrasonic field,

wherein at least a portion of said antenna substrate comprises magnetic particles of which at least some of said magnetic particles each have a largest dimension that is less than one micron.

17. The apparatus according to claim 16 , wherein at least some of said magnetic particles each have a refractive index differing from a refractive index of said at least a portion of said antenna substrate.

18. The apparatus according to claim 17 , wherein said magnetic particles are surrounded by a dielectric fluid, which constitutes said at least a portion of said antenna substrate.

19. The apparatus according to claim 18 , wherein said at least a portion of said antenna substrate is capable of establishing a standing wave at an ultrasonic frequency.

20. The apparatus according to claim 19 , wherein said magnetic particles in said at least a portion of said antenna substrate are arranged by said ultrasonic field for modifying said property of said at least a portion of said antenna substrate.

21. The apparatus according to claim 16 , wherein said modified property of said antenna substrate is a magnetic permeability or dielectric constant.

22. The apparatus according to claim 16 , wherein said apparatus comprises a patch antenna comprising said modified antenna substrate between a patch and a ground plane.

23. The apparatus according to claim 16 , wherein said apparatus is a mobile communications device.

24. An apparatus comprising:

an antenna substrate,

means for modifying a property of said antenna substrate,

wherein at least a portion of said antenna substrate comprises magnetic particles of which at least some of said magnetic particles each have a largest dimension that is less than one micron.