In the future, there still have some topics we can reasearch. For the on-chip antenna, the size decreasing, high radiation effeciency, and radiation pattern that we require. For the second topic, leaky wave antenna, side lobe level decreasing, frequency scanning region increasing, total size decreasing, and operating frequency increasing. It will have many ways to design the open end of the leaky wave antenna to enhance the performance. In our research, the monopole is added to enhance the frequency scanning range.
We can use many ways to design the leaky wave antenna to reach not only increasing frequency scanning range but decreasing the size of the proposed antenna.
For MIMO antenna, increasing isolation between antennas is the most important. The number of antenna is more than 2. So, decreasing the relationship between antennas is more difficult. In MIMO antenna, the decoupling device is the important component. There are many ways to design the decoulping device, and good designing not only decouple an-tennas but match the impedance of every antenna. Decreasing the size of the decoupling device is another research. In the future, we can utilize the decoupling devive to combinate radiated antennas to reach the perfor-mance what we want. For instance, we want to generate circle polarization MIMO antenna. we will design the circle polarization antennas and de-coupling device to improve the antenna performance. It will be worthy to research the combination of decoupling device and radiated antennas.
61
Reference
[1] P. Smulders. “exploring the 60 ghz band for local wireless multime-dia access: Prospects and future directions,”. IEEE Commun, vol.
40(No.1):140–147, Jan 2002.
[2] C.H. Doan, S. Emami, A.M. Niknejad, and R.W. Brodersen. “design of cmos for 60ghz applications,”. In Solid-State Circuits Conference, 2004. Digest of Technical Papers. ISSCC. 2004 IEEE International, pages 440–538. IEEE, 2004.
[3] Y.P. Zhang, M. Sun, and LH Guo. “on-chip antennas for 60-ghz ra-dios in silicon technology,”. Electron Devices, IEEE Transactions on, 52(7):1664–1668, 2005.
[4] S.S. Hsu, K.C. Wei, C.Y. Hsu, and H. Ru-Chuang. “a 60-ghz millimeter-wave cpw-fed yagi antenna fabricated by using 0.18µ cmos technology,”. Electron Device Letters, IEEE, 29(6):625–627, 2008.
[5] W. Menzel. “a new travelling wave antenna in microstrip,”. In Mi-crowave Conference, 1978. 8th European, pages 302–306. IEEE, 1979.
[6] A.A. Oliner and KS Lee. “the nature of the leakage from higher modes on microstrip line,”. In Microwave Symposium Digest, 1986 IEEE MTT-S International, pages 57–60. IEEE, 1986.
[7] C.Y. Chiu, J.B. Yan, and R.D. Murch. “compact three-port orthogo-nally polarized mimo antennas,”. Antennas and Wireless Propagation Letters, IEEE, 6:619–622, 2007.
[8] C.Y. Chiu, J.B. Yan, and R.D. Murch. “24-port and 36-port antenna cubes suitable for mimo wireless communications,”. Antennas and Propagation, IEEE Transactions on, 56(4):1170–1176, 2008.
[9] S.C. Chen, Y.S. Wang, and S.J. Chung. “a decoupling technique for increasing the port isolation between two strongly coupled antennas,”.
Antennas and Propagation, IEEE Transactions on, 56(12):3650–3658,
[10] C.Y. Chiu, C.H. Cheng, R.D. Murch, and C.R. Rowell. “reduction of mutual coupling between closely-packed antenna elements,”. Antennas and Propagation, IEEE Transactions on, 55(6):1732–1738, 2007.
[11] Y. Chung, S.S. Jeon, D. Ahn, J.I. Choi, and T. Itoh. “high isolation dual-polarized patch antenna using integrated defected ground struc-ture,”. Microwave and Wireless Components Letters, IEEE, 14(1):4–6, 2004.
[12] A. Diallo, C. Luxey, P. Le Thuc, R. Staraj, and G. Kossiavas. “en-hanced two-antenna structures for universal mobile telecommunica-tions system diversity terminals,”. Microwaves, Antennas and Propa-gation, IET, 2(1):93–101, 2008.
[13] L. Inclan-Sanchez, J.L. Vazquez-Roy, and E. Rajo-Iglesias. “high iso-lation proximity coupled multilayer patch antenna for dual-frequency operation,”. Antennas and Propagation, IEEE Transactions on, 56(4):1180–1183, 2008.
[14] A.C.K. Mak, C.R. Rowell, and R.D. Murch. “isolation enhancement between two closely packed antennas,”. Antennas and Propagation, IEEE Transactions on, 56(11):3411–3419, 2008.
[15] J. Guterman, A.A. Moreira, and C. Peixeiro. “integration of omnidi-rectional wrapped microstrip antennas into laptops,”. Antennas and Wireless Propagation Letters, IEEE, 5(1):141–144, 2006.
[16] C.Y. Chiu and R.D. Murch. “compact four-port antenna suitable for portable mimo devices,”. Antennas and Wireless Propagation Letters, IEEE, 7:142–144, 2008.
[17] H.R. Chuang and L.C. Kuo. “3-d fdtd design analysis of a 2.4-ghz polarization-diversity printed dipole antenna with integrated balun and polarization-switching circuit for wlan and wireless communica-tion applicacommunica-tions,”. Microwave Theory and Techniques, IEEE Trans-actions on, 51(2):374–381, 2003.
[18] LC Kuo, H.R. Chuang, YC Kan, TC Huang, and CH Ko. “a study of planar printed dipole antennas for wireless communication applications,”. Journal of Electromagnetic Waves and Applications, 21(5):637–652, 2007.
[19] RN Simions and RQ Lee. “on-wafer characterization of millimeterwave antennas for wireless application,”. IEEE Trans. Microw. Theory Tech, 47(1):92–96, 1999.
63
[20] G. Augustin, SV Shynu, P. Mohanan, CK Aanandan, and K. Vasude-van. “a novel leaky wave antenna capable for electronic beam steer-ing,”. In Antennas and Propagation Society International Symposium 2006, IEEE, pages 4255–4258. IEEE.
[21] Y. Li, Q. Xue, E.K.N. Yung, and Y. Long. “quasi microstrip leaky-wave antenna with a two-dimensional beam-scanning capability,”. An-tennas and Propagation, IEEE Transactions on, 57(2):347–354, 2009.
[22] Y.C. Shih, S.K. Chen, C.C. Hu, and CF Jou. “active feedback mi-crostrip leaky wave antenna-synthesiser design with suppressed back lobe radiation,”. Electronics Letters, 35(7):513–514, 1999.
[23] Y.L. Chiou, J.W. Wu, J.H. Huang, and C.F. Jou. “design of short mi-crostrip leaky-wave antenna with suppressed back lobe and increased frequency scanning region,”. Antennas and Propagation, IEEE Trans-actions on, 57(10):3329–3333, 2009.
[24] J.W. Wu, C.J. Wang, and C.F. Jou. “method of suppressing the side lobe of a tapered short leaky wave antenna,”. Antennas and Wireless Propagation Letters, IEEE, 8:1146–1149, 2009.
[25] A. Oliner and K. Lee. “microstrip leaky wave strip antennas,”. In An-tennas and Propagation Society International Symposium, 1986, vol-ume 24, pages 443–446. IEEE, 1986.
[26] C.J. Wang, C.F. Jou, J.J. Wu, and S.T. Peng. “radiation characteris-tics of active frequency-scanning leaky-mode antenna arrays,”. IEICE transactions on electronics, 82(7):1223–1228, 1999.
[27] C.J. Wang, H.L. Guan, and C.F. Jou. “a novel method for short leaky-wave antennas to suppress the reflected wave,”. Microwave and Optical Technology Letters, 36(2):129–131, 2003.
[28] I.Y. Chen, C.J. Wang, H.L. Guan, and C.F. Jou. “studies of sup-pression of the reflected wave and beam-scanning features of the an-tenna arrays,”. Anan-tennas and Propagation, IEEE Transactions on, 53(7):2220–2225, 2005.
[29] A.J. Paulraj, D.A. Gore, R.U. Nabar, and H. Bolcskei. “an overview of mimo communications-a key to gigabit wireless,”. Proceedings of the IEEE, 92(2):198–218, 2004.
[30] G.J. Foschini and M.J. Gans. “on limits of wireless communications
[31] T. Hult and A. Mohammed. “compact mimo antennas and hap diver-sity for enhanced data rate communications,”. In Vehicular Technol-ogy Conference, 2007. VTC2007-Spring. IEEE 65th, pages 1385–1389.
IEEE.
[32] Z. Li and ” Rahmat-Samii, Y. “optimization of pifa-ifa combination in handset antenna designs. Antennas and Propagation, IEEE Trans-actions on, 53(5):1770–1778, 2005.
[33] F. Yang and Y. Rahmat-Samii. “microstrip antennas integrated with electromagnetic band-gap (ebg) structures: A low mutual coupling de-sign for array applications,”. Antennas and Propagation, IEEE Trans-actions on, 51(10):2936–2946, 2003.
[34] Z. Iluz, R. Shavit, and R. Bauer. “microstrip antenna phased array with electromagnetic bandgap substrate,”. Antennas and Propagation, IEEE Transactions on, 52(6):1446–1453, 2004.
[35] L. Yang, M. Fan, F. Chen, J. She, and Z. Feng. “a novel compact electromagnetic-bandgap (ebg) structure and its applications for mi-crowave circuits,”. Mimi-crowave Theory and Techniques, IEEE Trans-actions on, 53(1):183–190, 2005.
[36] A. Diallo, C. Luxey, P. Le Thuc, R. Staraj, and G. Kossiavas. “study and reduction of the mutual coupling between two mobile phone pifas operating in the dcs1800 and umts bands,”. Antennas and Propaga-tion, IEEE Transactions on, 54(11):3063–3074, 2006.
[37] A. Diallo, C. Luxey, P. Le Thuc, R. Staraj, G. Kossiavas, M. Franzen, and P.S. Kildal. “mimo performance of enhanced umts four-antenna structures for mobile phones in the presence of the users head,”. In An-tennas and Propagation Society International Symposium, 2007 IEEE, pages 2853–2856. IEEE, 2007.
[38] A. Diallo and C. Luxey. “estimation of the diversity performance of several two-antenna systems in different propagation environments,”.
In Antennas and Propagation Society International Symposium, 2007 IEEE, pages 2642–2645. IEEE.
[39] S. Ranvier, C. Luxey, P. Suvikunnas, R. Staraj, and P. Vainikainen.
“capacity enhancement by increasing both mutual coupling and ef-ficiency: A novel approach,”. In Antennas and Propagation Society International Symposium, 2007 IEEE, pages 3632–3635. IEEE, 2007.
65
[40] T.W. Kang and K.L. Wong. “isolation improvement of 2.4/5.2/5.8 ghz wlan internal laptop computer antennas using dual-band strip res-onator as a wavetrap,”. Microwave and Optical Technology Letters, 52(1):58–64, 2010.
[41] J. Andersen and H. Rasmussen. “decoupling and descattering networks for antennas,”. Antennas and Propagation, IEEE Transactions on, 24(6):841–846, 1976.
[42] P. Hannan, D. Lerner, and G. Knittel. “impedance matching a phased-array antenna over wide scan angles by connecting circuits,”. Antennas and Propagation, IEEE Transactions on, 13(1):28–34, 1965.