Wideband Dielectric Resonator Monopole Antenna

• US 20080048915A1
• Filed: 08/23/2006
• Published: 02/28/2008
• Est. Priority Date: 08/23/2006
• Status: Active Grant

• Current Assignee: National Taiwan University (Government of The Republic of China)
• Original Assignee: National Taiwan University (Government of The Republic of China)
• Inventors: Kiang, Jean-Fu, Chang, Tze-Hsuan
• Granted Patent: US 7,619,564 B2
• Time in Patent Office: Days
• US Class Current: 343/700MS
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 9/0485 Dielectric resonator antennas
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A wideband dielectric resonator monopole antenna, which includes a dielectric resonator and a monopole antenna, combines two frequency bands having close resonant frequencies to achieve 49% of bandwidth and omnidirectional radiation patterns within the frequency band. It includes a column structure and a substrate, wherein the surface of the column structure is coated with a conductive layer, the column structure is kept upright to the substrate, and the substrate is coated or printed with two slot lines extended inward from an edge of the substrate.

Claims

1. A wideband dielectric resonator monopole antenna, comprising:

a resonator having a column structure, part of its exterior surface is coated with a conductive material, and has a connector formed at a bottom end thereof; and

a feed-in/feed-out component which is composed of a wire pattern coated or printed on a substrate, wherein the wire pattern comprises a grounding part, parallel slot lines and open-circuited slot lines, and defines a resonator foot-print region;

the grounding part is made of a conductive material, and the parallel slot lines and the open-circuited slot lines are the part of the wire pattern that the conductive material is removed;

the parallel slot lines are composed of two parallel slot lines;

the open-circuited slot lines are composed of two open-circuited slot lines, which are extended and bent from the ends of the parallel slot lines at the resonator foot-print region;

wherein the connector of the conductive layer electrically connects with the grounding part of said wire pattern of the feed-in/feed-out component.

2. The antenna as claimed in claim 1, wherein the substrate is made of dielectric materials including FR4, Teflon, Duriod, fiberglass, aluminum oxide, and ceramic materials.

3. The antenna as claimed in claim 1, wherein the resonator is a rectangular column.

4. The antenna as claimed in claim 3, wherein a conductive layer is formed on three adjacent surfaces of the column structure of the resonator;

and part of the bottom end of the conductive layer extends and forms a connector to the bottom edge of the resonator; and

the connector electrically connects the conductive layer with the grounding part of the wire pattern of the feed-in/feed-out component.

5. The antenna as claimed in claim 1, wherein the resonant frequency of the resonator is determined by the coating area of the conductive layer of the resonator.

6. The antenna as claimed in claim 1, wherein the impedance matching of the feed-in/feed-out component is determined by an open-circuited slot length and an open-circuited slot width.

7. The antenna as claimed in claim 6, wherein the open-circuited slot length is preferably slightly less than a parallel slot spacing, and an open-circuited slot width is close to a parallel slot width.

8. The antenna as claimed in claim 1, wherein the impedance matching and operating frequency are determined by the dimensions of the resonator and the open-circuited slot length.

9. The antenna as claimed in claim 8, wherein the distance between the open-circuited slot lines and the backside of the column structure of the resonator is preferably one-seventh to one-sixth of a resonator width of the column resonator.