Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FA4
Session:
Number:4FA4-2
Low Profile Three-Dimensional Orthogonally Polarized Antennas
Hong-Jun Tang, Kin-Fai Tong, Wei Hong,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
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 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 [1-3]. The idea of threedimensional (3D) polarization has recently been explored [4, 5]; it is suggested that the capacity of wireless systems can be increased by two to three folds. However, the physical dimensions of cubic structures may not be ideal to integrate with mobile devices easily [5]. In this article, we propose to utilize the low profile characteristic of half mode substrate integrated waveguide antennas (HMSIW) [6-8] and substrate integrated waveguide (SIW) [9, 10] to significantly reduce the thickness of the three-dimensional orthogonally polarized antennas. This low profile design will be a good candidate for embedding into most mobile devices. The three radiating elements are closely located and the design has been carefully considered matching with the nature of wave propagation in complex environments. Moreover, it is not necessary to insert any baluns before connecting to the backend RF circuits. The antennas are designed to operate around 3.5 GHz and have impedance bandwidth more than 150 MHz which can support 4G wireless networks, such as WiMAX. CST Microwave Studio has been used for the simulations.