Compact dual‐band microstrip filtering power divider using T‐junction structure and quarter‐wavelength SIR

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This Letter presents a design of microstrip filtering power divider for dual-band application. The proposed dual-band filtering power divider is based on the traditional Wilkinson power divider and employs T-junction structures and quarter-wavelength stepped impedance resonators (SIRs) to realise dual-band power allocation and bandpass response simultaneously. The design process is simple and effective. For validation, a dual-band microstrip filtering power divider with centre frequencies of 0.9 and 2.1 GHz for the GSM and WCDMA applications is designed, fabricated and measured. The measured results indicate that the proposed dual-band filtering power divider showcases low-loss characteristics, high isolation as well as good selectivity.