부산대학교 도서관

In this work, an additively manufactured endfire bifilar helix antenna with a center frequency of f c = 66 GHz employing a novel transition from bifilar helix to E-band waveguide is presented. This novel transition enables a higher bandwidth of the antenna and also tuning of the antenna matching. Measurements suggest a -20 dB-bandwidth of B 20dB ≈ 5.2 GHz and -15 dB-bandwidth of B 15dB = 16 GHz respectively. An axial ratio below AR < 3.15 dB is achieved over the entire E-Band and even AR < 2 dB within B 20dB in main lobe direction. The realized linear polarization gain ranges at G lp 11 dBi with a circular polarization gain of G cp 12 to 13 dBi was measured. Hence, measurements suggest general feasibility of the proposed bifilar helix antenna for mmWave applications due to the small form factor of the antenna and the circular polarization. Those applications in future could be satellite systems or future 6G infrastructures.