A novel green phase shifter system is proposed in this research. The system is developed by a combination of reconfigurable beam steering antennas and data acquisition (DAQ) boards. A combination of two reconfigurable beam steering antennas, located side-by-side, forms a spatial configuration structure with a fabricated `green' element plank of rice husk placed in between. The concept of a spatial configuration technique has been `mutated' by shifting the structure of spiral feed line and aperture slots of first beam steering antenna by as much as 45º. The PIN diode switches connected to the DAQ boards enable the intelligent capability of the spatial antennas. The activation of certain degree radiation patterns of either the first beam steering antenna or the second beam steering antenna depends on the memory of the DAQ boards --- Beam Manager. When an intruder comes from the cardinal angles of 0º/360º, 90º, 180º, or 270º, its range and angles' location will be automatically detected by the first antenna through the output ports of the 1st DAQ: P1.0, P1.1, P1.2, and P1.3. The second antenna is then activated by the output ports of the 2nd DAQ: P2.0 up to P2.3, to adaptively maneuver the beam towards four different ordinal directions of 45º, 135º, 225º, and 315º. As a result, this system collectively contributes to the development of eight angles of radiation patterns, which can be rotated in 45º steps within 0.01 ms and successfully cover 360º without any uncovered and overlapped angle; 0°/360°, 45º, 90°, 135º, 180°, 225º, 270°, and 315º. Moreover, a mutual coupling effect generated by the spatial configuration of both antennas is alleviated by the element plank of rice husk, whose width, length, and thickness are 45 mm, 150 mm, and 10 mm, respectively. Possessing the characteristics of an adaptive new phase shifter concept and assisted by the green element of a rice husk, this system is potentially an effective way to decrease the number of drop outs and lost connections, and provides larger coverage. It is a promising candidate for installation with a WiMAX application.
2. Chen, Y., S. Yang, and Z.-P. Nie, "A novel wideband antenna array with tightly coupled octagonal ring elements," Progress In Electromagnetics Research, Vol. 124, 55-70, 2012.
doi:10.2528/PIER11121312
3. Yuan, H.-W., S.-X. Gong, P.-F. Zhang, and X. Wang, "Wide scanning phased array antenna using printed dipole antennas with parasitic element," Progress In Electromagnetics Research Letters, Vol. 2, 187-193, 2008.
doi:10.2528/PIERL08011602
4. Goel, P. and K. J. Vinoy, "A low-cost phased array antenna integrated with phase shifters cofabricated on the laminate," Progress In Electromagnetics Research B, Vol. 30, 255-277, 2011.
5. Bi, S. and X. Y. Ren, "Maneuvering target doppler-bearing tracking with signal time delay using interacting multiple model algorithms," Progress In Electromagnetics Research, Vol. 87, 15-41, 2008.
doi:10.2528/PIER08091501
6., , www.ni.com/pdf/products/us/20043762301101dlr.pdf.
7. Dietrich, C. B., Jr., K. Dietze, J. R. Nealy, and W. L. Stutzman, "Spatial, polarization, and pattern diversity for wireless handheld terminal," IEEE Transactions on Antennas and Propagation, 1271-1281, 2002.
8. Kim, H., W. Choi, and H. Park, "Effects of antenna correlation on spatial diversity and multiuser diversity," IEEE WCNC, 2008.
9. Mavridis, G. A., J. N. Sahalos, and M. T. Chryssomallis, "Spatial diversity two-branch antenna for wireless devices," IEEE Electronics Letters, 266-268, 2006.
doi:10.1049/el:20063994
10. Georgiadis, A. and C. Kalialakis, "Combined effects of finite diversity switch isolation and antenna mutual coupling on spatial diversity," IEEE Transactions on Antennas and Propagation Magazine, 221-226, 2008.
doi:10.1109/MAP.2008.4494554
11. Georgiadis, A. and C. Kalialakis, "Combined effects of finite diversity switch isolation and antenna mutual coupling on spatial diversity,", Vol. 50, No. 1, Feb. 2008.
doi:10.1109/MAP.2008.4494554
12. Ali, M. T., T. A. Rahman, M. R. Kamarudin, M. N. Md Tan, and R. Sauleau, "Planar array antenna with parasitic elements for beam control," PIERS Proceedings, 181-185, Aug. 18-21, 2009.
13. Ali, M. T., M. R. B. Kamarudin, T. B. A. Rahman, R. Sauleau, and M. N. Md Tan, "Design of reconfigurable multiple elements microstrip rectangular linear array antenna," Progress In Electromagnetics Research C, Vol. 6, 21-35, 2009.
doi:10.2528/PIERC08122101
14. Ali, M. T., M. N. Md Tan, T. B. A. Rahman, M. R. B. Kamarudin, M. F. Jamlos, and R. Sauleau, "A novel of reconfigurable planar antenna array (RPAA) with beam steering control," Progress In Electromagnetics Research B, Vol. 20, 125-146, 2010.
doi:10.2528/PIERB10020710
15. Karmakar, N. C. and M. E. Bialkowski, "A compact switched-beam array antenna for mobile satellite communications," Microwave and Optical Technology Letters, Vol. 21, No. 3, 186-191, 1999.
doi:10.1002/(SICI)1098-2760(19990505)21:3<186::AID-MOP9>3.0.CO;2-7
16. Koledintseva, M. Y., J. L. Drewniak, R. E. DuBro®, K. N. Rozanov, and B. Archambeault, "Modeling of shielding composite materials and structures for microwave frequencies," Progress In Electromagnetics Research B, Vol. 15, 197-215, 2009.
doi:10.2528/PIERB09050410
17. Bahadorzadeh Ghandehari, M., M. Naser-Moghadasi, and A. R. Attari, "Improving of shielding effectiveness of a rectangular metallic enclosure with aperture by using extra wall," Progress Electromagnetics Research Letters, Vol. 1, 45-50, 2008.
doi:10.2528/PIERL07110706
18. Kaya, S., M. Turkmen, K. Guney, and C. Yildiz, "Neural models for the elliptic- and circular-shaped microshield lines," Progress In Electromagnetics Research B, Vol. 6, 169-181, 2008.
doi:10.2528/PIERB08031216
19. Rice husk ash market study, , Bronzoek Ltd, United Kingdom, 2003, http://www.berr.gov.uk/les/le15138.pdf.
20. Padiberas Nasional Berhad, , Annual Report 2007, Petaling Jaya, Selangor, 2007, http://padiberas.listedcompany.com/misc/ar2007.pdf.