Miniaturized ultra-wideband microstrip antenna

• US 7,324,049 B2
• Filed: 12/30/2004
• Issued: 01/29/2008
• Est. Priority Date: 01/05/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Myoung, Soung-ho, Lee, Seong-soo, Kwon, Do-Hoon
• Primary Examiner(s): Phan; Tho
• Application Number:
  US11/024,715
• Publication Number:
  US 20050156787A1
• Time in Patent Office: 1,125 Days
• Field of Search: 343/700.MS, 343/702, 343/833, 343/834, 343/846, 343/790, 343/792
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A miniaturized ultra-wideband microstrip antenna, includes: a dielectric substrate; a feed line disposed on the dielectric substrate, and supplying an electromagnetic energy supplied from an external power source; a main radiating element radiating the electromagnetic energy inputted by the feed line; and at least one sub-radiating element disposed in proximity to the main radiating element for multi-radiation. Also, the antenna further includes at least one connection plate electrically connecting the main radiating element to at least one of the sub-radiating elements. The miniaturized ultra-wideband microstrip antenna can also be made ultralight, and include additional sub-radiating elements besides the main radiating element, whereby multi-radiation in UWB'"'"'s range can be attained.

Claims

1. A miniaturized ultra-wideband microstrip antenna, comprising:

a dielectric substrate;

a feed line disposed on the dielectric substrate, and supplying electromagnetic energy supplied from an external power source;

a main radiating element radiating the electromagnetic energy inputted by the feed line;

at least one sub-radiating element disposed in proximity to the main radiating element for multi-radiation; and

at least one connection plate connecting the at least one sub-radiating element to the main radiating element,

wherein the feed line comprises at least one slot of a predetermined size formed by an etching process,

wherein one sub-radiating element is connected to the main radiating element by one connection plate only, and

the main radiating element and the sub-radiating element have a same length.

2. The antenna according to claim 1, wherein an upper end of the main radiating element has a rectangular shape, the sub-radiating elements are symmetrically arranged with respect to the main radiating element, and an upper end of each sub-radiating element has a rectangular shape reducing the size of the antenna.

3. The antenna according to claim 2, wherein a length of a long side of the sub-radiating element is smaller than or equal to a length of a long side of the main radiating element.

4. The antenna according to claim 1, wherein one lower side of the main radiating element and the connection plate form a 90°

angle, and the connection plate and one lower side of the sub-radiating element form a 90°

angle.

5. The antenna according to claim 1, wherein the main radiating element and the sub-radiating elements are disposed on the same planar surface.

6. The antenna according to claim 1, wherein the main radiating element and the sub-radiating elements are disposed on a different planar surface.

7. The antenna according to claim 1, wherein the main radiating element and the sub-radiating elements are indirectly connected to each other through an electromagnetic coupling, and are spaced apart by a predetermined distance.

8. The antenna according to claim 1, wherein the dielectric substrate is an epoxy laminate (FR−

4) substrate having a relative dielectric constant (ε

_r) of approximately 4.4.

9. The antenna according to claim 1, wherein a length of a long side of the main radiating element is approximately 11.5 mm.

10. The antenna according to claim 1, wherein a length of a long side of the feed line is approximately 55 mm.

11. The antenna according to claim 1, wherein a sum of a length of a short side of the main radiating element, a length of the connection plate, and a length of a short side of the sub-radiating element is approximately 6.272 mm.

12. The antenna according to claim 1, wherein the connection plates are formed on an upper end, center, or lower end of the main and sub-radiating elements.

13. The antenna according to claim 1, further comprising:

a plurality of ground plates disposed on a top of the dielectric substrate, each being symmetrically spaced apart by a predetermined distance with respect to the feed line.

14. The antenna according to claim 13, further comprising:

a ground plate having a predetermined size disposed at a bottom of the dielectric substrate.

15. The antenna according to claim 1, further comprising:

a ground plate having a predetermined size to be disposed at a bottom of the dielectric substrate.

16. The antenna according to claim 1, wherein an insertion loss in a frequency range from 3.0 GHz to 12 GHz is less than 10 dB.

17. The antenna according to claim 1, wherein VSWR in a frequency range from 3.0 GHz to 12 GHz is less than 2.0.

18. The antenna according to claim 1, wherein if center frequency is 5 GHz, current is induced to a lower end of the main radiating element.

19. The antenna according to claim 1, wherein if center frequency is 5 GHz, current is induced to the main radiating element and a part of the sub-radiating element.

20. The antenna according to claim 1, wherein if center frequency is 10 GHz, current is induced to the main radiating element, the connection plate, and a part of the sub-radiating element.

21. The antenna according to claim 1, further comprising:

at least one additional sub-radiating element disposed at a predetermined position improving wideband characteristics of the antenna.

22. The antenna according to claim 21, wherein voltage standing wave ratio (VSWR) in a frequency range from 3.0 GHz to 18 GHz is less than 2.0.

23. The antenna according to claim 21, further comprising:

a plurality of connection plates electrically connecting the main radiating element, the sub-radiating elements, and the additional sub-radiating elements to each other.

24. The antenna according to claim 21, further comprising:

at least one connection plate electrically connecting the main radiating element to the additional sub-radiating elements.

25. The antenna according to claim 21, further comprising:

at least one connection plate electrically connecting the sub-radiating elements to the additional sub-radiating elements.

26. The antenna according to claim 21, wherein the additional sub-radiating elements are disposed on a same planar surface as the main radiating element or as the sub-radiating elements.

27. The antenna according to claim 21, wherein the additional sub-radiating elements are disposed on a same planar surface as the main radiating element and the sub-radiating elements.

28. The antenna according to claim 1, further comprising:

at least one additional sub-radiating element disposed at a predetermined position improving wideband characteristics of the antenna.

29. The antenna according to claim 28, wherein the sub-radiating elements and the additional sub-radiating elements are indirectly connected to each other through electromagnetic coupling, and are spaced apart by a predetermined distance.

30. The antenna according to claim 28, further comprising:

at least another connection plate electrically connecting the sub-radiating elements to the additional sub-radiating elements.

31. The antenna according to claim 28, wherein the additional sub-radiating elements are disposed on a same planar surface as the main radiating element or as the sub-radiating elements.

32. The antenna according to claim 28, wherein the additional sub-radiating elements are disposed on a same planar surface as the main radiating element and the sub-radiating elements.

33. The antenna according to claim 1, wherein the main radiating element and the sub-radiating elements are connected to each other through electromagnetic coupling.

34. The antenna according to claim 1, wherein the feed line is connected to a coaxial cable, and a center conductor of the coaxial cable is connected to a lower end of the main radiating element of the antenna, and an outer conductor is connected to a ground plate.

35. The antenna according to claim 1, wherein the main radiating element, the connection plates, and the sub-radiating elements are conductors.

36. The antenna according to claim 1, wherein the main radiating element, the connection plates, and the sub-radiating elements are plated with tin.

37. The antenna according to claim 1, wherein the main radiating element and the sub-radiating elements are connected to each other via hole.

38. The antenna according to claim 1, wherein a PCB process is applied to manufacture the antenna.

39. A miniaturized ultra-wideband microstrip antenna, comprising:

a main radiating element radiating electromagnetic energy inputted by a feed line;

at least one sub-radiating element disposed proximate to the main radiating element; and

at least one connection plate connecting the main radiating element to at least one sub-radiating element, wherein one lower side of the main radiating element and the connection plate form a 90°

angle, and the connection plate and one lower side of the sub-radiating element form a (90°

+θ

₁) angle, where θ

₁ is a predetermined angle.

40. A miniaturized ultra-wideband microstrip antenna, comprising:

a main radiating element radiating electromagnetic energy inputted by a feed line;

at least one sub-radiating element disposed proximate to the main radiating element; and

at least one connection plate connecting the main radiating element to at least one sub-radiating element, wherein one lower side of the main radiating element and the connection plate form a (90°

+θ

₂) angle (where θ

₂ is a predetermined angle), and the connection plate and one lower side of the sub-radiating element form a 90°

angle.

41. A miniaturized ultra-wideband microstrip antenna, comprising:

a main radiating element radiating electromagnetic energy inputted by a feed line;

at least one sub-radiating element disposed proximate to the main radiating element; and

at least one connection plate connecting the main radiating element to at least one sub-radiating element, wherein one lower side of the main radiating element and the connection plate form a (90°

+θ

₃) angle, and the connection plate and one lower side of the sub-radiating element form a (90°

+θ

₄) angle, where, θ

₃ and Θ

₄ are predetermined angles.

42. A miniaturized antenna, comprising:

a substrate having first and second sides;

a feed line disposed on the first side of the substrate;

a radiating element connected to the feed line;

at least one sub-radiating element disposed in proximity to the radiating element,

at least one connection plate directly connecting the radiating element to the at least one sub-radiating element,

wherein the feed line comprises at least one slot of a predetermined size formed by an etching process, and

wherein the radiating element and the sub-radiating element have a same length.

43. The antenna according to claim 42, wherein at least one ground plate is disposed in close proximity to the feed line.

44. The antenna according to claim 42, wherein a ground plate is disposed on the second side of the substrate.

45. An antenna, comprising:

a radiating element connected to a feed line;

at least one sub-radiating element proximate to the radiating element,

at least one connection plate connecting the radiating element to the at least one sub-radiating element,

wherein the radiating element and the sub-radiating element have a same length, and

wherein the at least one sub-radiating element has first and second portions respectively extending in first and second directions from the connection plate.