Conical Conformal Antenna Design using the CPM Method for MIMO Systems

Abstract In this article, the design of conformal antennas has been discussed using the characteristic modes (CM) method. For this purpose, the vector wave function(VWF) has been utilized to achieve a twodimensional mapping of the conformal antenna. In designing and analyzing of coneshaped antennas applicable for multiinput multioutput (MIMO) systems, the most important goal is to achieve a structure with the least correlation coefficient. In order to achieve this goal in these types of antennas, first an appropriate twodimensional mapping has been selected using the vector wave functions and then its orthogonal characteristic modes have been obtained by the CPM method. In this way, a 4port conical antenna, whose analysis had many computational problems, was designed; the results obtained from the simulation and the prototype as well as the measurement of this antenna also confirmed the low correlation coefficient ( lt; 0.001), the gain of about 4.2 dB in a frequency of 5.5 GHz, and SWR lt; 1.22 in the frequency range of 4.6 to 6.6 GHz, indicating a broad bandwidth of around 32%.