Karakteristik mod teorisini kullanarak örüntüsü değiştirilebilir anten tasarımı

Pattern reconfigurable antennas improve the performance of the system in applications which have dynamic radiation pattern requirements like multi-input multi-output arrays, phased arrays and body area networks. Characteristic mode theory was shown to be useful when investigating the possible orthogonal radiation patterns on an antenna element. Due to improvements in computation capacity of the modern computers, characteristic mode analysis can be used efficiently during the design of pattern reconfigurable antennas. Several types of methods are proposed to excite distinct orthogonal modes on an antenna element in the literature. However, the fundamental idea behind all of these methods can be classified as either excitation by capacitive couplers or excitation by inductive couplers. The main drawback of these methods is their complexity in terms of fabrication. This work proposes a novel method for the excitation of different characteristic modes using only the microstrip feed lines so that the fabrication process can be simplified substantially. The proposed method is optimized for the chosen frequency range and simulated. The radiation patterns of realized configurations are measured and compared with the simulation results. Similarities and discrepancies are discussed. Finally, alternative excitation topologies are illustrated as the possible future work.