Design of Quad-Band Bandpass Filter Lumped-Element Using Shunt Resonator and Independent Transmission Zero
Keywords:
Bandpass filter, independent transmission zero, quad-band, shunt resonatorAbstract
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.
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