ABSTRACTThis article proposes new synthetic design approach for a compact LTCC bandpass filter (BPF) with three transmission zeros over a wide stopband operating in the 2.4–2.5 GHz WLAN band. The BPFs have two feedback paths, one for a grounding inductor and one for a coupling capacitor, to provide controllable multiple transmission zeros at 1.07 and 5.05 GHz stopband, which suppresses the 0.82–0.96 GHz GSM850/GSM900 band and 4.8–5.0 GHz second harmonic band of the operating frequency. The presented design derives compact formulas for synthesizing a filter to meet the specification requirement. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2155–2157, 2013