Compact low cost 5G NR n78 band pass filter with silicon IPD technology

A low cost and compact 1608 size Silicon integrated passive device (IPD) band pass filter design for the new 5G New Radio (NR) n78 band is discussed in this paper. Top coupled filter topology with transmission zeroes is selected to give low insertion loss (IL) <; 1.8 dB in passband 3.3 ~ 3.8 GHz, with >30dB attenuation at 2.7 GHz and 4.9 GHz. Therefore, this design can effectively filter out adjacent ISM, 5G NR n41, and WLAN bands. Model correlation is verified with Silicon IPD wafer measurements. Variation study and Flip Chip die level performance is also discussed.