Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator

TIAN Ge; YANG Jinping; WU Wen

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Article Navigation > Chinese Journal of Electronics > 2013 > 22(1): 192-194

TIAN Ge, YANG Jinping, WU Wen, “Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator,” Chinese Journal of Electronics, vol. 22, no. 1, pp. 192-194, 2013,

Citation:

TIAN Ge, YANG Jinping, WU Wen, “Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator,” Chinese Journal of Electronics, vol. 22, no. 1, pp. 192-194, 2013,

TIAN Ge, YANG Jinping, WU Wen, “Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator,” Chinese Journal of Electronics, vol. 22, no. 1, pp. 192-194, 2013,

Citation:

TIAN Ge, YANG Jinping, WU Wen, “Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator,” Chinese Journal of Electronics, vol. 22, no. 1, pp. 192-194, 2013,

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Design of Bandpass Filters Using Three Parallel Coupled-Lines with Open Stub Resonator

1.
Ministerial Key Laboratory of JGMT, Nanjing University of Science and Technology, Nanjing 210094, China;
2.
Purple Mountain Observatory, CAS, Nanjing 210008, China;
3.
Key Laboratory of Radio Astronomy, CAS, Nanjing 210008, China

Received Date: 2011-09-01
Rev Recd Date: 2012-06-01
Publish Date: 2013-01-05

Abstract

Abstract

Bandpass filter with equal-ripple response in the passband and four transmission zeros in the stopband is synthesized in this letter. Equivalent circuit model is proposed. Based on even- and odd-mode theory, design formulas are derived to provide relationship between filtering characteristics (center frequency, bandwidth, and transmission zeros) and circuit parameters for the filter. To verify the design concept, a bandpass filter with a fractional bandwidth of 26.7% (ripple level 0.01dB) at the center frequency of 3.9 GHz is designed and fabricated. The measured insertion loss is less than 0.6 dB, and return loss is higher than 19.4 dB in the passband. The stopband extends to 10.4 GHz with the rejection level of 20 dB. Measured results show good agreement with simulations.
- Bandpass filter (BPF),
- Even- and oddmode,
- Three parallel coupled- lines

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References(9)

References

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