Super compact and ultrabroadband power divider using silicon-based integrated passive device technology

In this paper, an ultrabroadband two-way power divider with super compact circuit size is demonstrated using the silicon-based integrated passive device technology. By replacing all the eight quarter-wavelength lines in a conventional four-section Wilkinson power divider with bridged-T coils, the circuit size can be largely reduced without reducing the bandwidth. As a result, an ultrabroadband power divider with 10-dB return loss/isolation bandwidth from 1.85 to 21.30 GHz can be realized in a very compact circuit size of 3.41 × 1.17 mm², which is only about 0.132λ 0× 0.045λ 0 at the center frequency f₀ = 11.6 GHz. The measured insertion loss is less than 2 dB in the same frequency range. To the best of our knowledge, this is the smallest ultrabroadband passive power divider design with larger than 10:1 bandwidth ever reported.