Feeding Strategies for PCB Based ME Dipole Antennas at D-Band

This study compares two different feed structures for dual-polarized magnetoelectric (ME) dipole antennas intended for D-band (110–170 GHz) applications. The investigated single-ended and differential feed designs are appropriate for next-generation wireless communication systems because they attain a large impedance bandwidth of 42.8%, effectively spanning the whole D-band spectrum. Although the single-ended feed structure exhibits steady gain and uniform radiation patterns throughout the band, its isolation is not ideal, with levels falling as low as -12 dB at certain frequencies. In contrast, the differential feed structure provides improved polarization purity and good isolation, but at the expense of decreased gain stability and weakened radiation patterns, especially at higher frequencies. Critical performance metrics such as S-parameters, gain, isolation, radiation efficiency, and radiation patterns are evaluated for a thorough comparison of these two feeding systems.