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Abstract
This paper presents a novel dual-band bandpass filter with two sets of stub-loaded open-loop resonator, using stepped-impedance, which results in a reduction in size. Two sets of resonators are synthesized using a doublet coupling scheme for 60/77 GHz resonance. The two passbands are flexible due to implement with two parallel transmission paths and tuning each bandwidth independently by changing even-mode resonant frequency. The fractional 3-dB bandwidths at 60 and 77 GHz are 11.4 and 8.3%, respectively. The values at 60 and 77 GHz are −2.26 and −2.63 dB and the
values at 60 and 77 GHz are −24.8 and −18.5 dB, respectively. Between the two passbands, the transmission zero at 67 GHz gives nearly 22.6 dB isolation. Good performance makes this system attractive for wireless communications.
Acknowledgements
The authors wish to acknowledge the support by HSIC of Chang Gung University, NSC (101-2221-E-182-054, 99-2632-E-182-001-MY3) and UERPD (2B0101) of Taiwan.