Integrated design of a non-reflective filtering power divider with wide passband

LTCC (Low-Temperature Co-fired Ceramic) technology is a new process for designing integrated circuit. Based on this process, a theoretical method of a reflectionless filtering power divider with wide pass band is proposed for simulated structure, which consists of bandpass coupling lines, absorptive band-stop section and a power divider. A wide passband is realized by quarter-wavelength coupling lines with strong coupling. A lossy resistor loading in the absorptive band-stop section is used to achieve reflectionless performance out of the passband, preventing to damage the pre-stage RF devices caused by echoes or reduce the linearity of the RF front-end system, thereby improving the communication quality of the system. For verification, a prototype of the proposed filtering power divider operating at 6.85 GHz with the fractional bandwidth of 74% is designed and simulated. Comparisons of the calculated and simulated results are in good agreement and presented to verify the theoretical predictions.