Abstract
An exhaustive review of millimeter-wave (mm-wave) active bandpass filters (BPFs)
is presented in this article. The details of various design approaches and realization techniques
for the implementation of active BPFs are provided. The strengths, weaknesses, and design
challenges of active BPFs are discussed. The available process technologies are investigated
for the development of mm-wave filters. Active BPFs exhibit the merits of low loss, good outof-
band rejection, good selectivity, and a high integration level. By applying loss compensation
techniques, active BPFs are realized with low losses. The aim of this paper is to motivate
research and development of high performance mm-wave BPFs, especially above the 60 GHz
frequency band.