This paper presents a quad-mode dual-band bandpass filter (BPF) using one shorted stub and two pairs of open stubs. The proposed filter simultaneously operates at Bluetooth (2.4–2.485[Formula: see text]GHz) and WLAN (5.1–5.35[Formula: see text]GHz) band. The filter has been designed and fabricated on Rogers’s RO4350 substrate and has a size of 13 × 12.26mm2.