This paper presents a compact slotted MIMO cube antenna operating at 5.8 GHz, consisting of three orthogonal slots, each with a distinct main direction of radiation. Each slot produces linear polarization enabling the structure to radiate three orthogonal polarizations. This provides spatial diversity which helps mitigating the effects of multipath propagation and enhances the diversity gain. The cube is filled with a dielectric with a relative permittivity, εr thus reducing the minimum dimension of the cube by a factor of 1/√εr . The antenna has a return loss of 20 dB and a coupling of less than -26 dB between the ports. This paper describes the principle operation as well as the design and manufacturing process of the proposed antenna.
2. Andersen, J. B. and B. N. Getu, "The MIMO cube — A compact MIMO antenna," The 5th Int. Symp. Wireless Personal Multimedia Commun., 112-114, 2002.
doi:10.1109/WPMC.2002.1088142
3. Nemeth, A., L. Szucs, and L. Nagy, "MIMO cube formed of slot dipoles," 16th IST Mobile Wireless Commun. Summit, 1-5, 2007.
4. Sarrazin, J., Y. Mahe, S. Avrillon, and S. Toutain, "Investigation on cavity/slot antennas for diversity and MIMO systems: The example of a three-port antenna," IEEE Antennas Wireless Propag. Lett., Vol. 7, 414-417, 2008.
doi:10.1109/LAWP.2008.2000830
5. Jones, D., Navy Electricity and Electronics Training Series, 1998.
6. Fujita, K. and H. Shirai, "Theoretical limitation of the radiation efficiency for homogenous electrically small antennas," IEICE Transactions on Electronics, Vol. 98, No. 1, 2-7, 2015.
doi:10.1587/transele.E98.C.2
7. Shahpari, M. and D. V. Thiel, Physical bounds for antenna radiation efficiency, arXiv preprint arXiv:1609.01761, 2016.
8. Cheng, D. K., Field and Wave Electromagnetics, 1989.
9. Coetzee, J. and J. Joubert, "The design of planar slot arrays revisited," ACES J, Vol. 15, No. 1, 27-33, 2000.
10. Stegen, R. J., Longitudinal shunt slot characteristics, Tech. Rep., Hughes Aircraft Co., 1951.
11. Shahpari, M. and D. V. Thiel, "The impact of reduced conductivity on the performance of wire antennas," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 11, 4686-4692, 2015.
doi:10.1109/TAP.2015.2479241
12. Kraus, J. D. and R. J. Marhefka, Antenna for All Applications, New York, 2002.
13. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," Electronics letters, Vol. 39, No. 9, 705-707, 2003.
doi:10.1049/el:20030495
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