— In this research, quad-band bandpass filter (BPF) which operated at frequencies of 0.9 GHz, 1.8 GHz, 2.3 GHz, and 2.6 GHz will be designed, fabricated, and evaluated. Design of quad-band BPF is done based on shunt resonator that connected in cascade connection. In filter design, three independent transmissions zero was generated to provide four resonance frequencies by simply connect shunt resonator in series with capacitor or inductor. Transmission zero is also generated to enhance rejection area between each passband and to adjust resonance frequency. Quad-band BPF is design using ADS software and then fabricated in FR-4 substrate. Simulation results show that S11 = -59.12, -25.80, -33.25, -33.84 dB, S21 less than 0 dB, bandwidth 122, 94, 92, 87 MHz and VSWR is 1.002, 1.108, 1.044, and 1.041 for resonance frequency at center frequencies of 950 MHz, 1.85 GHz, 2.35 GHz, and 2.65 GHz, respectively. The frequency center of the fabricated quadband BPF shifted to 776 MHz, 1.526 GHz, 2.435 GHz, and 2.787 GHz. The return loss and VSWR of the fabricated quadband BPF are satisfied to the design specifications.
— Bandpass filter, independent transmission zero, quad-band, shunt resonator.
The authors are with Department of Electrical Engineering, Faculty of Engineering, University of Indonesia. Kampus Baru UI Depok 16424, Indonesia (e-mail: gunawan@ eng.ui.ac.id, firstname.lastname@example.org, email@example.com).
Cite: Gunawan Wibisono, Taufiq A. Kurniawan, and Mohamad W. Santoso, " Design of Quad-Band Bandpass Filter Lumped-Element Using Shunt Resonator and Independent Transmission Zero," International Journal of Information and Electronics Engineering vol. 3, no. 6, pp. 626-629, 2013.