Low Profile Three-Dimensional Orthogonally Polarized Antennas

 
Visiting researcher: Dr Hongjun Tang (SEU)
Host researcher: Dr. Kin-Fai Tong (UCL)
Duration: 3 months
Status: Completed
 

Biography of the visiting researcher

Hong Jun Tang received the M.S. degree in circuits and system from the University of Electronic Science and Technology of China, Chendu, China, in 2000, and the PhD degree in electromagnetic field and microwave technology from Southeast University, Nanjing, China . Since 2007, he has been working with the State Key Laboratory of Millimeter Waves, Southeast University. His research interests include microwave and millimeter wave passive elements, antenna and array, and RF circuits.
 

Background and motivation

In future wireless communication systems, high data-rate and reliability are compulsory requirements. But the system performances are often degraded due to the fading effect of channels. To improve the performance, diversity is commonly considered to be an effective method. There are basically three routes to realize diversity: space, polarization, and pattern. Given a limited space and low profile of handheld devices, space and pattern diversity may not be the best choice. On the other side, it has been demonstrated that polarization diversity, basically dual polarization can be implemented in handheld devices with impressive performances.
 
The idea of 3-dimensional (3D) polarization antennas has rarely been investigated in the literature before; it is a key device to realize higher level of polarization diversity. The proposed antenna design will carefully consider matching with the nature of wave propagation in complex environments; it is believed that the multi-polarization antennas can provide more MIMO channels which are useful for improving the capability of channels.
 
The team will explore the 3-D polarization antenna theory and develop the required design method. Prototypes of the multi-polarization antennas will be fabricated and evaluated. Moreover, the practical integration issues of the antenna in a compact handset will be investigated.
 

Research activities

  1. Attend the workshop in UCL to report the contribution of visitor's research group in Chinese 4G research activities and the first proposal of the antennas.
  2. Many models are proved and researched at UCL. The theory and the dependence of the performance against the parameters are discussed. The results are used to guide the design. A final prototype is used to verify idea. It has been made and measured.
  3. The first research results are published at ISAP2010. Besides, an pattern application is under progressed. Some valuable original mode are still researched after the visit.
 

Outcomes

A prototype of the proposed antennas and its performance report have been proved. Based on the research, a paper has been published on the 2010 international symposium on the antennas and propagation. This paper includes the technical detail about the proposed antennas. Files for an joint international pattern application are readying. Researching on an advanced mode is still under progress and were to be submitted to letters if having a great results. These outcomes are basically constant with the plan.
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