A 77-GHz integrated on-chip Yagi antenna with unbalanced-to-balanced bandpass filter using IPD technology

This paper presents the design and implementation of a 77-GHz integrated on-chip Yagi antenna with unbalanced-to-balanced bandpass filter with an integrated passive device (IPD) technology. The Yagi antenna is fed by the balanced output of the balun-filter, whose amplitude and phase differences between the balance ports from 74 to 82 GHz are within 0.5 dB and 180° ± 5°, respectively. The Friis power transmission formula is used to determine the radiation power gain. The measured input VSWR is less than 3 from 71 to 78 GHz and the power gain is about 0.5 dBi at 77 GHz.