High‐performance filtering power divider with multiple transmission zeros

Abstract

Abstract A wideband filtering power divider (FPD) with multiple transmission zeros (TZs) is presented in this article. By introducing four pairs of coupled lines and two half‐wavelength stubs to the power divider, a flat passband with two controllable TZs and four fixed ones is achieved. A resistor is then arranged in the structures to obtain good isolation between output ports. For demonstration, a FPD centred at 2.6 GHz with 3‐dB fractional bandwidth of 22% is designed, fabricated, and measured. The measured minimum in‐band insertion loss is 0.34 dB, and the isolation is over 20 dB within the passband. Good agreement between the simulated and measured results can be observed.