Wideband Lumped-Element Quadrature Hybrid for Intermediate Frequency Applications

摘要

A wideband lumped-element quadrature hybrid is proposed and implemented for intermediate frequency (IF) applications. The proposed topology not only enables a wide fractional bandwidth (FBW) of 33 % with only 7 elements, but also makes the required capacitance and inductance values lower, which is helpful for size reduction when establishing elements using interdigital capacitor and spiral inductor implementation instead of 0402 package element implementation. The size of the proposed quadrature hybrid is only 8 mm ×3 mm, Measured S11, S21, S31 and S41 are better than -14, -4.3, -3.6 and -13 dB from 50 to 70 MHz, respectively. And the measured inband phase difference between the coupled and direct ports is within 91