DUAL-BAND ANTENNA FOR RECEIVING VHF AND UHF SIGNAL AND COMMUNICATION DEVICE INCLUDING THE SAME

• US 20090153424A1
• Filed: 03/16/2007
• Published: 06/18/2009
• Est. Priority Date: 03/20/2006
• Status: Abandoned Application

• Current Assignee: EMW Antenna Company Limited
• Original Assignee: EMW Antenna Company Limited
• Inventors: Kim, Won Seob, Jeon, Seung Gu, Sung, Won Mo, Ryou, Byung Hoon, Choi, Woo Young, Choi, Jae Hoon
• Application Number:
  US12/281,620
• Publication Number:
  US 20090153424A1
• Time in Patent Office: Days
• US Class Current: 343/767
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

Disclosed herein is a dual-band antenna for a terminal for receiving VHF and UHF signals. A radiator of the dual-band antenna for a terminal for receiving VHF and UHF signals according to the present invention comprises a first patch bent at a part of a distal end thereof, and a second patch electrically connected to the first patch and formed in a spiral shape. A longitudinal portion of the second patch is constructed superposedly in a multi-structure in parallel with that of the first patch, so that the broadband of the VHF and UHF can be covered through an inverted L-shaped folded antenna structure.

Claims

1. A dual-band antenna for a terminal for receiving VHF and UHF signals, comprising:

a radiator arranged in parallel with a ground plane; and

a feed line connected to the radiator, wherein the radiator comprises a first patch connected to the feed line and bent at a certain portion thereof, and a second patch electrically connected to the first patch in such a fashion as to form a multi-layered structure, the second patch being formed in a spiral shape.

2. The dual-band antenna according to claim 1, wherein the first patch has an electric length for covering a UHF band, and the second patch has an electric length for covering a VHF band through interconnection with the first patch.

3. The dual-band antenna according to claim 1, wherein an open stub is provided at a portion ranging from a feed terminal of the certain portion of the first patch to a distal end of the first patch in one direction, so that the length of the open stub is adjusted to cover the UHF broad band.

4. The dual-band antenna according to claim 1, wherein an open stub is provided at a portion ranging from a certain position of the second patch to a distal end of the second patch in one direction so that the length of the open stub is adjusted to cover the UHF broad band.

5. The dual-band antenna according to claim 1, wherein the second patch is divided at a predetermined portion, and an LC resonance circuit is connected between the divided portions of the second patche so as to cover the VHF broad band.

6. The dual-band antenna according to claim 5, wherein a bent conductor is formed at an inner side of the second patch so as to correct the frequency characteristic due to the LC resonance circuit.

7. The dual-band antenna according to claim 1, wherein at least a part of the first patch is superposed with at least a part of the second patch in such a fashion as to be electromagnetically coupled with at least the part of the second patch.

8. The dual-band antenna according to claim 1, wherein the dual-band antenna is internally mounted in the terminal for receiving VHF and UHF signals.

9. The dual-band antenna according to claim 1, wherein the VHF signal is an available frequency band signal for a terrestrial-digital multimedia broadcasting (T-DMB) service.

10. A wireless communication terminal including the dual-band antenna according to claim 1.