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Antenna Device, and Mobile Communications Device Incorporating the Antenna Device

The performance of wireless communication systems can be greatly enhanced by utilizing antenna diversity or smart antennas. Such antenna systems make use of multiple antennas and they have been incorporated into the base stations of most mobile telephone systems in use today. However, adoption of similar antenna systems in compact wireless communication handsets has not been widespread. One possible explanation is the volume of similar systems are usually too large and the improved performance of the handset does not sufficiently compensate for increases in receiver complexity.

This new invention consists of a compact integrated antenna that has two feed ports with more than 20dB isolation between them. The significance of the design is that it can be utilized in compact wireless communication handsets to provide diverse signals or act as a duplexer allowing the receive and transmit signals to be well isolated. The antenna design is based on merging two patch antennas together in combination with capacitive loading so that a compact design can be obtained. Experimental results show that in typical wireless environments envelope cross-correlations of less than 0.1 between the ports are obtained.
Technology Benefits
There are recently developed antenna algorithms such as BLAST that may overcome the complexity verses performance issue. However the antenna volume that dual or multiple antennas occupy remains a problem. There are also previous works that significantly brought down the size of antennas but they are for individual/single ones only.

For the new invention, despite the merging of the two antennas into one, good isolation between the antenna inputs can still be achieved. A dual antenna of such a compact size is uncommon in the market.
Technology Application
- 3rd generation wireless systems
- Handsets of mobile communication devices as part of a smart antenna system
Supplementary Information
Patent Number: US6897808B1
Application Number: US2000649874A
Inventor: Murch, Ross David | Ko, Chun (Samuel) Kuen
Priority Date: 28 Aug 2000
Priority Number: US6897808B1
Application Date: 28 Aug 2000
Publication Date: 24 May 2005
IPC Current: H01Q000124 | H01Q000138 | H01Q000904
US Class: 343700MS | 343702 | 343846
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Antenna device, and mobile communications device incorporating the antenna device
Usefulness: Antenna device, and mobile communications device incorporating the antenna device
Summary: Used in a mobile communication device (claimed) e.g. mobile telephone.
Novelty: Antenna device for e.g. wireless communication handset, has feed ports that are connected to Y-shaped transmission plate at locations on transmission plate which are on different branches of transmission plate
Sub Category
Application Date
28 Aug 2000
Application No.
US 09/649874
Patent Information
US 6897808
ID No.
Hong Kong

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