A compact chip filter for 5G communication frontend based on Glass IPD technology

A glass-based IPD band-pass chip filter for 5G N77 application is presented in this paper. This filter is composed of five shunt LC resonators. The low loss passband performance is realized by two LC resonators connected in shunt near the input and output terminals. The high rejection property for the stopband is realized by three LC resonators connected in series on the main branch of this filter. This filter is successfully manufactured with a commercial glass IPD process. Its chip size is
$\mathbf{1.6\times 0.8{mm}^{2}}$
. The measurement results show that, the working frequency band of this filter is 3.2-4.0GHz, the maximum passband loss is only 2.0dB, and the stopband rejection is higher than 30dB at the designed zero-point frequencies.