Ultra wideband antenna

• US 20050017903A1
• Filed: 07/24/2003
• Published: 01/27/2005
• Est. Priority Date: 07/22/2003
• Status: Active Grant

• Current Assignee: Callahan Cellular LLC (Intellectual Ventures LLC)
• Original Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Inventors: Lee, David, Autar, Yahia, Lapierre, Marc, Thirakoune, Soulideth, Petosa, Aldo, Ittipiboon, Apisak
• Granted Patent: US 6,940,463 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 9/0485 Dielectric resonator antennas
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

An ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane. The monopole has an effective length L of one quarter wavelength at the lowest frequency f₁. A dielectric resonator antenna (DRA) surrounds the monopole antenna for resonating at substantially between or at two and three times the lowest frequency f₁. the DRA is of a height of less than ¾ L and is disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein 0≦G≦0.2 H. The ultra-wideband antenna is of a much greater bandwidth than the sum of bandwidth of the monople or the DRA alone.

Claims

1. An ultra-wideband antenna for operating in a frequency band having a lowest frequency f₁, comprising:

a ground plane;

a monopole antenna extending from the ground plane and having an effective length L of one quarter or one half wavelength, λ

₁/4 or λ

₁/2 respectively, at the lowest frequency f₁; and

a dielectric resonator antenna (DRA) surrounding the monopole antenna for resonating at substantially between or at two and three times the lowest frequency f₁, the DRA having a height H less than ¾

L, the DRA being disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein 0≦

G≦

0.2 H.

2. The ultra-wideband antenna as defined in claim 1, wherein H≦

L/2; and

wherein the monopole antenna extends beyond the dielectric antenna at an upper free end thereof, the upper end of the monopole antenna for generating a monopole radiation pattern.

3. The ultra-wideband antenna as defined in claim 2, wherein the relative permittivity Er of material comprising the DRA is equal to or greater than 8.

7. An ultra-wideband antenna as defined in claim 1, wherein the monopole antenna provides only a single feed to the DRA.

4. An ultra-wideband antenna for operating in a frequency band having a lowest frequency f₁ and a bandwidth of B_u-wa, where B_u-wa is at least 4-times greater than B_m+B_DRA, comprising:

a ground plane;

a DRA having a bandwidth B_DRA;

a monopole antenna having an bandwidth B_m surrounded by the DRA, for feeding the DRA and for radiating energy, the monopole antenna extending beyond the DRA at an upper end,

wherein the monopole antenna extends vertically above the ground plane and has a effective length L of one quarter wavelength at the lowest frequency f₁,

wherein the DRA is for resonating at a frequency f_DRA, wherein 2 f₁≦

f_DRA≦

3 f₁,

wherein the dielectric resonator is of a height H, where H≦

½

L, and

wherein the DRA is disposed in such a manner as being above the ground plane, and either contacting or spaced therefrom by a gap G, wherein 0≦

G≦

0.2 H.

5. An ultra-wideband antenna as defined in claim 4, wherein the DRA is for operating primarily in a TM_0Nδ

mode, where N is an integer greater than or equal to 1.

6. An ultra-wideband antenna as defined in claim 4, wherein the monopole antenna provides only a single feed to the DRA.

8. An ultra-wideband antenna as defined in claim 4, wherein the DRA is for operating primarily in a TM_01δ

mode.

9. An ultra-wideband antenna for operating in a frequency band having a lowest frequency

f₁ approximately 3.3 GHz, comprising a ground plane;

a monopole antenna extending from the ground plane and having an effective length L of approximately one quarter the wavelength at frequency f₁; and

a dielectric resonator antenna (DRA) surrounding the monopole antenna for resonating the TM_01δ

mode at approximately three times the lowest frequency f₁, the DRA having a height H between 0.3 L and 0.5 L, having a relative dielectric constant E_r of approximately 10, the DRA being disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein G is less than or equal to 0.2 H.