Engineered High Resistivity Silicon Substrates in IPD Technology Used for Miniaturized sub-6 GHz Filters

A simple miniaturized sub‐6‐GHz bandpass filter with wide upper stopband in gallium arsenide‐based integrated passive device process

“…In the literature, most of sub‐6‐GHz IPD filters are directly designed by LC resonant circuits 1–7 . Generally, high performance of bandpass filters with ultra‐wide stopband has been presented by sacrificing circuit area as well as the design complexity 1,2 .…”

“…In 6 , very simple LC circuit is proposed to achieve a miniaturized bandpass filter with wide stopband but in the passband, there is only one transmission pole. In addition, there are also some filter designs that do not take the stopband rejection into account 7,8 . To reduce the complexity of various LC parameters, an effective method is to design lumped circuit via parameter transformations from a distributed transmission line network, 9–11 which have achieved not only good in‐band performances but also ultra‐wide stopbands.…”

“…In the literature, most of sub-6-GHz IPD filters are directly designed by LC resonant circuits. [1][2][3][4][5][6][7] Generally, high performance of bandpass filters with ultra-wide stopband has been presented by sacrificing circuit area as well as the design complexity. 1,2 For example, the filter design in 2 requires to determine ten capacitances and seven inductances, which bringing great difficulty to the final optimization.…”

“…In addition, there are also some filter designs that do not take the stopband rejection into account. 7,8 To reduce the complexity of various LC parameters, an effective method is to design lumped circuit via parameter transformations from a distributed transmission line network, [9][10][11] which have achieved not only good in-band performances but also ultra-wide stopbands. Nevertheless, their circuit areas are still not tiny enough and the circuit design procedures from distributed networks still require some simplifications.…”