Compact filtering power divider for mm-wave applications using integrated passive device technology

Abstract

We present a compact, filtering power divider (FPD) using integrated passive device technology (IPD) for mm-wave applications. Our proposed FPD design integrates quarter-wavelength coupled-resonator bandpass filters with a Wilkinson power divider, using size reduction techniques. Coupled coplanar waveguides provide excellent coupling while occupying a small area, and metal-insulator-metal capacitors offer the required lambda/4 phase shift without length extension. The center frequency of the filtering power divider/combiner (FPD/C) is located at 30-GHz. We demonstrate our FPD design by fabricating four prototypes with parameter variations. The insertion loss, fractional bandwidth, and size of the FPD/C designed in this study are from 2.56 to 3.3 dB, from 9.67% to 19.4%, and from 0.592 to 0.220-mm2, respectively. In addition, the return loss of all models at the center frequency is 28.5 dB or more, and the isolation is 16.6 dB or more.